1. The utility model provides an injection moulding frock which characterized in that, injection moulding frock is used for making injection moulding material and inserts for integrated into one piece by the part, injection moulding frock includes:

a first mold body having a first surface;

the stop piece is arranged on the first surface of the first die body;

the heating device is used for heating and softening the preformed piece;

the drawing mechanism is arranged close to the first die body and used for drawing the heated and softened preformed piece to move along a preset track on the first surface of the first die body, and when the preformed piece moves along the preset track, the stop piece stops the preset bending position of the preformed piece so that the preformed piece is bent on the first surface of the first die body to form the embedded piece; and

and the second mold body is matched with the first mold body and used for being matched with the first surface of the first mold body and then being subjected to injection molding to form the prepared part.

2. The injection molding tool according to claim 1, wherein the stopper is movably disposed on the first mold body;

the stop piece is provided with a first position protruding out of the first surface of the first die body and a second position contained in the first die body, when the preform moves along the preset track, the stop piece is located at the first position, and before the first die body and the second die body are closed to carry out injection molding, the stop piece is switched to the second position.

3. The injection molding tool according to claim 1 or 2, wherein the preform has a plurality of the preset bending positions, the number of the stop members is plural, the plurality of stop members are arranged at intervals, and the plurality of stop members and the plurality of preset bending positions are arranged in a one-to-one correspondence manner.

4. The injection molding tool according to claim 3, wherein the first mold has a first edge and a second edge that are oppositely disposed, and the stopper comprises:

two first stoppers arranged close to the first edge of the first mold at intervals; and

a second stop spaced proximate a second edge of the first mold.

5. The injection molding tool according to claim 4, wherein the preform has opposite first and second ends, the pulling mechanism pulls the first and second ends of the preform, respectively, to move the first and second ends of the preform along the predetermined trajectory, the stop further comprising:

a third stopper for abutting on the preform between the second stopper and the pulling mechanism after the preform is bent under the stop of the second stopper.

6. The injection molding tool according to claim 4, wherein the number of the second stop members is two, a distance between two of the first stop members is a first distance, a distance between two of the second stop members is a second distance, and the first distance is greater than the second distance.

7. The injection molding tooling of claim 1 or 2, wherein the preform is a fiber reinforced plastic plate, and the fibers in the fiber reinforced plastic plate are at least one of glass fibers, carbon fibers and plant fibers; and/or

The injection molding material is at least one of polypropylene, nylon and polycarbonate.

8. An injection molding method for the injection molding tool according to any one of claims 1 to 7, wherein the injection molding method is used for manufacturing an injection molding material and an embedded part into an integrally molded part, and is characterized by comprising the following steps:

the heating device heats the preform to soften the preform;

placing the preform on a first surface of the first mold body;

the pulling mechanism grabs and pulls the preform to enable the preform to move according to a preset track, and during the movement of the preform, the stop piece abuts against a preset bending position of the preform to enable the preform to be bent to form the embedded piece; and

and closing the first surface of the first mold body and the second mold body and performing injection molding to form the part to be manufactured.

9. The injection molding method of claim 8, wherein the stopper is movably disposed on the first mold body; the stopper is provided with a first position protruding out of the first surface of the first die body and a second position contained in the first die body;

before the step of performing said step of said pulling mechanism gripping said preform and pulling said preform to move it according to a preset trajectory, said stopper is switched to said first position; and/or

The stopper is switched to the second position before the step of closing the first surface of the first mold body and the second mold body and performing injection molding is performed.

10. An injection molding method as claimed in claim 8, wherein said heating means heats said preform to soften said preform in the step of:

the heating device heats the preformed piece for no less than 30s and no more than 60s, the melting point of the injection molding material is a first temperature, the heating temperature of the heating device is a second temperature, and the difference between the second temperature and the first temperature is no less than 20 ℃ and no more than 50 ℃; and/or the surface temperature tolerance of the heated preform is +/-2-3 ℃.

Background

The existing process for arranging an insert inside an injection-molded part generally comprises two ways: first, a space is reserved on an injection-molded part, and an insert is inserted into the reserved space after injection molding is completed; second, after the insert is injection molded through the mold, the insert is inserted into the injection molded part during the injection molding of the injection molded part so that the insert and the injection molded part are combined. In the two modes, the embedded part and the injection part are respectively formed by adopting two sets of injection molding equipment, so that the injection molding operation is complicated, the processing cost is increased, and part of product structures cannot be molded by the method.

Disclosure of Invention

The invention mainly aims to provide an injection molding tool and an injection molding method, and aims to solve the problem that the existing insert injection molding operation is complicated.

In order to achieve the above object, the present invention provides an injection molding tool for manufacturing an injection molding material and an insert as an integrally formed workpiece, the injection molding tool comprising:

a first mold body having a first surface;

the stop piece is arranged on the first surface of the first die body;

the heating device is used for heating and softening the preformed piece;

the drawing mechanism is arranged close to the first die body and used for drawing the heated and softened preformed piece to move along a preset track on the first surface of the first die body, and when the preformed piece moves along the preset track, the stop piece stops the preset bending position of the preformed piece so that the preformed piece is bent on the first surface of the first die body to form the embedded piece; and

and the second mold body is matched with the first mold body and used for being matched with the first surface of the first mold body and then being subjected to injection molding to form the prepared part.

Optionally, the stopper is movably arranged on the first mold body;

the stop piece is provided with a first position protruding out of the first surface of the first die body and a second position contained in the first die body, when the preform moves along the preset track, the stop piece is located at the first position, and before the first die body and the second die body are closed to carry out injection molding, the stop piece is switched to the second position.

Optionally, the preform has a plurality of the preset bending positions, the number of the stop members is plural, the stop members are arranged at intervals, and the stop members and the preset bending positions are arranged in a one-to-one correspondence manner.

Optionally, the first mold has first and second oppositely disposed edges, the stopper comprises:

two first stoppers arranged close to the first edge of the first mold at intervals; and

a second stop spaced proximate a second edge of the first mold.

Optionally, the preform has opposite first and second ends, the pulling mechanism pulls the first and second ends of the preform, respectively, to move the first and second ends of the preform along the preset trajectory, the stopper further comprising:

a third stopper for abutting on the preform between the second stopper and the pulling mechanism after the preform is bent under the stop of the second stopper.

Optionally, the number of the second stoppers is two, the distance between two of the first stoppers is a first distance, the distance between two of the second stoppers is a second distance, and the first distance is greater than the second distance.

Optionally, the preform is a fiber reinforced plastic plate, and the fibers in the fiber reinforced plastic plate are at least one of glass fibers, carbon fibers and plant fibers; and/or

The injection molding material is at least one of polypropylene, nylon and polycarbonate.

The invention also provides an injection molding method for the injection molding tool, which is used for manufacturing an injection molding material and an embedded part into an integrally molded part, and the injection molding method comprises the following steps:

the heating device heats the preform to soften the preform;

placing the preform on a first surface of the first mold body;

the pulling mechanism grabs and pulls the preform to enable the preform to move according to a preset track, and during the movement of the preform, the stop piece abuts against a preset bending position of the preform to enable the preform to be bent to form the embedded piece; and

and closing the first surface of the first mold body and the second mold body and performing injection molding to form the part to be manufactured.

Optionally, the stopper is movably arranged on the first mold body; the stopper is provided with a first position protruding out of the first surface of the first die body and a second position contained in the first die body;

before the step of performing said step of said pulling mechanism gripping said preform and pulling said preform to move it according to a preset trajectory, said stopper is switched to said first position; and/or

The stopper is switched to the second position before the step of closing the first surface of the first mold body and the second mold body and performing injection molding is performed.

Optionally, the heating device heats the preform to soften the preform in the step of:

the heating device heats the preformed piece for no less than 30s and no more than 60s, the melting point of the injection molding material is a first temperature, the heating temperature of the heating device is a second temperature, and the difference between the second temperature and the first temperature is no less than 20 ℃ and no more than 50 ℃; and/or the surface temperature tolerance of the heated preform is +/-2-3 ℃.

According to the technical scheme, after the heating device is used for heating and softening the preformed piece, the preformed piece is pulled on the first surface of the first die body, so that the preformed piece is blocked and bent by the stop piece on the first die body in the moving process along the preset track, the preformed piece is bent to form the shape of the embedded piece, then the first die body and the second die body are matched for injection molding, the embedded piece can be processed and molded on an injection molding tool, a set of die for molding the embedded piece does not need to be separately provided, the embedded piece can be directly matched with the first die body, the positioning of the embedded piece is realized, and the molding step is facilitated to be simplified.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic structural view of one embodiment of a fabricated part of the present invention;

FIG. 2 is a schematic diagram of an embodiment of a first surface condition of a preform drawn to a first mold body according to the present invention;

FIG. 3 is a schematic structural view of one embodiment of a preform bending at a time in accordance with the present invention;

FIG. 4 is a schematic view of an embodiment of the insert in a molded state according to the present invention;

FIG. 5 is a flow chart of an embodiment of the injection molding method of the present invention.

The reference numbers illustrate:

reference numerals	Name (R)	Reference numerals	Name (R)
				10	First mold body	11	First surface
12	Stop piece	121	First stop member
				122	Second stop member	123	Third stop member
20	Preform	21	Presetting a bending position
				22	Insert part	30	Prepared part

The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.

In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

Referring to fig. 1, the present invention provides an injection molding tool, the injection molding tool is used for manufacturing an injection molding material and an insert 22 into an integrally formed part 30 to be manufactured, the injection molding tool has a cavity for molding the injection molding material, and after a series of operations such as mold closing, injection molding and pressure maintaining are performed on the injection molding tool, the insert 22 and the injection molding material can form the part 30 to be manufactured. When injection molding the insert 22 with an injection molding material, the melting point of the insert 22 is generally 20 to 50 ℃ higher than the melting point of the injection molding material. The injection molding material can be glass fiber reinforced nylon. The material of the insert 22 may be selected as the case may be. Fig. 1 to 5 are corresponding drawings of an embodiment of the present invention.

Referring to fig. 2, the injection molding tool includes:

a first mold body 10, said first mold body 10 having a first surface 11; the first surface 11 of the first mold body 10 is used to form one surface of a cavity.

A stopper 12 provided on a first surface 11 of the first casing 10; the stop member 12 is arranged to protrude from the first surface 11 such that the stop member 12 forms a stop structure on the surface to limit the displacement of an object moving on the first surface 11.

Heating means (not shown in the figure) for heat-softening the preform 20; the preform 20 is used to form the insert 22, and after the preform 20 is heated by the heating device, the preform 20 is softened such that the preform 20 has a certain stretch property. The heating device may be an infrared oven, or may be other heating equipment capable of heating and softening the preform 20. Optionally, in this embodiment, the preform 20 is a fiber reinforced plastic plate, wherein the fiber type may be a combination of one or more of glass fiber, carbon fiber, and plant fiber. The fiber form may be a unidirectional tape or a braid. The injection molding material is a thermoplastic resin, and may be a combination of one or more of polypropylene, nylon, and polycarbonate, so as to avoid the problem of stress concentration at the bonding interface between the metal insert 22 and the injection molding material. The preformed piece is a flat piece and can be arranged in a strip shape, and compared with a conventional insert, the preformed piece does not need to be processed too much, so that more cost can be saved.

A drawing mechanism (not shown in the figures) disposed near the first mold 10 for drawing the heated and softened preform 20 to move along a predetermined track on the first surface 11 of the first mold 10, wherein the stopper 12 blocks a predetermined bending position 21 of the preform 20 when the preform 20 moves along the predetermined track, so that the preform 20 is bent to form the insert 22 on the first surface 11 of the first mold 10; the drawing mechanism may be a robot, and the drawing mechanism draws a predetermined portion of the preform 20 so that the preform 20 can move on the first surface 11 of the first mold 10. The movement of the preform 20 according to the preset track can be limited by presetting the action track of the traction mechanism, so that the preform 20 can move to the position of the stopper 12, when the preset bending position 21 of the preform 20 moves to the position of the stopper 12, the stopper 12 abuts against the preset bending position 21 of the preform 20, so that the preform 20 is bent at the preset bending position 21, and the shape of the insert 22 is formed.

And a second mold body (not shown in the figure) which is matched with the first mold body 10 and is used for carrying out injection molding to form the prepared part 30 after being matched with the first surface 11 of the first mold body 10. The first surface 11 of the first mold body 10 is disposed toward the second mold body, and the second mold body and the first mold body 10 are assembled to form the cavity. And after the first mold body 10 and the second mold body are closed, performing injection molding, and after pressure maintaining molding, forming the prepared part 30.

Referring to fig. 2, fig. 3 and fig. 4, taking the drawing mechanism as an example of a manipulator, a through hole is formed in the preform 20 and adapted to the manipulator, and taking the through hole as an example of the through hole being located at two ends of the preform 20, the manipulator clamps the through hole of the preform 20 so that the two ends of the preform 20 can move synchronously with the manipulator, a preset bending position 21 is formed on the preform 20, and after bending along the preset bending position 21, the preform 20 can be formed into a shape required by the insert 22. After the heating device heats and softens the preformed piece 20, the mechanical arm clamps the preformed piece 20 to the first surface 11 of the first mold body 10, and after the heating device heats, the temperature difference of different positions of the surface of the preformed piece 20 is within +/-2-3 ℃, so that when the preformed piece 20 is bent, the deformation performance is relatively uniform, and defects such as cracks and the like are not easy to cause due to temperature unevenness. When the manipulator drives the preformed piece 20 to move along a preset track, two ends of the preformed piece 20 relatively move until a preset bending position 21 of the preformed piece 20 reaches the position of the stop piece 12, the stop piece 12 shields the preset bending position 21, and when the manipulator continues to drive the preformed piece 20 to move, the preset bending position 21 bends. The manipulator drives the preformed piece 20 to keep the current shape so as to bend and shape the preset bending position 21 of the preformed piece 20. In the process of pulling the preform 20 by the manipulator, the preform 20 can be bent at the bending position 21, and the preform 20 can be arbitrarily molded by controlling the moving track of the manipulator. When the number of the stop parts 12 is multiple, the mechanical arm pulls the preformed piece to move, so that a plurality of bending positions can be formed on the preformed piece, further any shape can be formed, and the molding of the special-shaped embedded part on the first mold body 10 is realized.

Optionally, the preform 20 has a first end and a second end opposite to each other, the pulling mechanism pulls the first end and the second end of the preform 20 respectively to move the first end and the second end of the preform 20 along the preset trajectory, the robot grips the first end and the second end of the preform 20, and during the bending process, a tension is applied to the preform 20 so that the preform 20 can be kept in a tight state.

Since the preform 20 is bent to form the insert 22 under the shielding of the stopper 12, the insert 22 can be molded on the first mold body 10, and a separate mold for the insert 22 is not required, so that the cost of the injection molding method can be reduced, and the processing cost of the prepared part 30 can be reduced. Because the preform 20 is softened by heating to have better stretching and deformation properties, the preform 20 can maintain a preset bending state after being molded on the first mold 10 under the action of the drawing mechanism until the insert 22 is completely molded, so that the insert 22 can maintain a preset shape. In contrast to the conventional injection molded insert 22, the present embodiment can realize the molding of the irregularly shaped insert 22.

When the first mold body 10 and the second mold body are clamped for injection molding, the stopper 12 can block the insert 22 from being deformed, so as to fix the insert 22 and prevent the insert 22 from being displaced or damaged. The stop 12 may position the position of the insert 22 on the first mold body 10, so that the insert 22 can enter the cavity formed by the first mold body 10 and the second mold body according to a preset position, and the insert 22 is prevented from being dislocated. Since the temperature of the injection molding material is generally high during the injection molding process, the insert 22 is defined on the first mold body 10, which can help to improve the accuracy of the position of the insert 22.

In one embodiment, the stopper 12 is movably disposed on the first mold body 10; the stop piece 12 has a first position protruding out of the first surface 11 of the first mold body 10 and a second position received in the first mold body 10, when the preform 20 moves along the preset track, the stop piece 12 is in the first position, and before the first mold body 10 and the second mold body are closed for injection molding, the stop piece 12 is switched to the second position. When the stopper 12 is in the first position, the stopper 12 protrudes out of the first surface 11, so that the stopper 12 can block the relative movement of the preform 20, and further the stopper 12 can abut against a preset bending position 21 of the preform 20, and when the manipulator continues to pull the preform 20 to move, the preset bending position 21 bends to bend the preform 20 into a preset shape.

When the stopper 12 is in the second position, the stopper 12 does not shield the insert 22, and the injection material is injected into the cavity so as to perform injection molding on the injection material and the insert 22. By arranging the stop member 12 to be movable between the first and second positions, the insert 22 can be made more maneuverable. After the insert 22 is molded, the first mold body 10 and the second mold body are closed, and before injection molding, the stopper 12 moves to the second position, so that the preset bending position 21 of the insert 22 is not blocked, and the injection molding material can be matched with the preset bending position 21 of the insert 22 to form a stable embedding state, thereby facilitating molding of the prepared part 30 and preventing the problem of poor contact between the preset bending position 21 of the insert 22 and the injection molding material.

The time for switching the stopper 12 to the second position may be determined according to the injection molding process. The stopper 12 may be a needle-like structure or a block-like structure disposed on the first mold 10 to cooperate with the predetermined bending position 21 of the insert 22. The stopper 12 may be slidably disposed on the first mold 10 such that the stopper 12 may be slidably switched between the first position and the second position.

Referring to fig. 1, taking the example that the insert 22 has four predetermined bending positions 21, including A, B predetermined bending positions 21 at the upper portion and C, D predetermined bending positions 21 at the lower portion, the stopper 12 includes two first stoppers 121 and two second stoppers 122, the two first stoppers 121 correspond to the A, B predetermined bending positions 21, and the two second stoppers 122 correspond to the C, D predetermined bending positions 21. The pulling mechanism pulls both ends of the preform 20. After the preform 20 is heated by the heating device, the pulling mechanism clamps the preform 20 above the first surface 11 of the first mold body 10, and the pulling mechanism moves downward to make A, B two preset bending positions 21 abut on two first stoppers 121. The pulling mechanism continues to pull the preformed unit 20 to move downwards and bring the two ends of the preformed unit 20 close to each other until C, D two preset bending positions 21 of the preformed unit 20 abut against the two second stoppers 122. The pulling mechanism continues to pull the two ends of the preform 20 away from each other to bend the preform 20 into a shape resembling a "figure", and the pulling mechanism remains tensioned to cool and shape the preform 20 to form the insert 22. Closing the first mold body 10 and the second mold body, switching the first stopper 121 and the second stopper 122 to the second position, and performing injection molding and pressure holding to form the part 30 to be manufactured.

When the preform 20 moves according to the preset track, the first stopper 121 and the second stopper 122 can be selected to be in the first position or the second position as required, and thus interference of the stopper 12 on the moving track of the preform 20 can be reduced when the preform 20 is pulled by the pulling mechanism.

Optionally, the preform 20 has a plurality of the preset bending positions 21, the number of the stoppers 12 is plural, the plurality of stoppers 12 are arranged at intervals, and the plurality of stoppers 12 and the plurality of preset bending positions 21 are arranged in a one-to-one correspondence. When the preform 20 moves along the preset track, the stop members 12 sequentially abut against the corresponding preset bending positions 21, so that the preform 20 is bent and molded for multiple times.

By providing a plurality of said stoppers 12 and a plurality of said predetermined bending sites 21, said preform 20 is pulled at said pulling mechanism to keep said preform 20 in a tensioned state, which in turn is bent by said stoppers 12, forming a polygonal insert 22. Since the plurality of stop members 12 are disposed in one-to-one correspondence with the plurality of preset bending positions 21 of the preform 20, each preset bending position 21 can be blocked by the corresponding stop member 12, so that the preform 20 is in a tensioned state, and the precise molding of the insert 22 is realized.

Optionally, the first mold has a first edge and a second edge opposite to each other, the stopper 12 includes a first stopper 121 disposed near the first edge and a second stopper 122 disposed near the second edge, and a moving track of the traction mechanism corresponds to positions of the plurality of stoppers 12. Taking the structure of the insert 22 as shown in fig. 1 as an example, the pulling mechanism pulls the end of the preform 20, and after the preset bending position 21 of the preform 20 abuts on the first stopper 121, the pulling mechanism continues to pull the preform 20 so as to make another preset bending position 21 of the preform 20 abut on the second stopper 122, and the preform 20 is bent at the positions of the first stopper 121 and the second stopper 122. One of the ends of the preform 20 may be fixed by the pulling mechanism during movement of the pulling mechanism.

Further optionally, said stopper 12 comprises: two first stoppers 121 spaced apart near a first edge of the first mold; and a second stopper 122 spaced near a second edge of the first mold. The drawing mechanisms respectively draw preset parts of the preform 20, the two first stoppers 121 and the two second stoppers 122 form a triangular distribution, and when the preform 20 is drawn to move, the preform 20 forms a bending structure under the action of the first stoppers 121 and the second stoppers 122.

The number of the second stoppers 122 may be determined according to the shape of the insert 22. The preform 20 may be bent to form a substantially triangular structure by the first stopper 121 and the second stopper 122, or may be formed in other shapes.

Optionally, the number of the second stoppers 122 is two, two of the second stoppers 122 are disposed at intervals, a distance between two of the first stoppers 121 is a first distance, a distance between two of the second stoppers 122 is a second distance, and the first distance is greater than the second distance. In the process that the pulling mechanism drives the preform 20 to move, the length of the preform 20 between the two first stoppers 121 is greater than the length of the preform 20 between the two second stoppers 122, so that the insert 22 can form a shape such as an approximate omega shape with a large width at one end and a small width at the other end.

Optionally, the preform 20 has a first end and a second end opposite to each other, the pulling mechanism pulls the first end and the second end of the preform 20 respectively to move the first end and the second end of the preform 20 along the preset trajectory, and the stopper 12 further comprises: a third stopper 123 for abutting on the preform 20 between the second stopper 122 and the pulling mechanism after the preform 20 is bent under the stop of the second stopper 122. The third stop 123 may be a stop for abutting on the preform 20. When the preform 20 is bent by the second stopper 122, the portion near the first end and/or the second end of the preform 20 is easily bent, and the third stopper 123 is abutted to a position where warpage is easily generated, so that the preform 20 can be in a relatively stable tensioned state, and the fixing of the insert 22 is facilitated.

When the number of the second stoppers 122 is two, the third stopper 123 may be divided into two parts, one part of which is used for abutting on the preform 20 between the first end and the adjacent second stopper 122, and the other part of which is used for abutting on the second end and the adjacent second stopper 122 to compress the preform 20.

The invention further provides an embodiment of an injection molding method for the injection molding tool in any one of the embodiments. The injection molding method is used for manufacturing the injection molding material and the embedded part into an integrally molded part to be manufactured.

Referring to fig. 5, the injection molding method includes the following steps:

the heating device heats the preform 20 to soften the preform 20S 100.

The preform 20 is placed on the first surface 11 of the first mold body 10S 200. A stop 12 is protruded on the first surface 11 for stopping the preform 20 so as to bend and mold the preform 20 on the first surface 11 of the first mold 10.

S300, the pulling mechanism grabs and pulls the preformed piece 20 so as to enable the preformed piece 20 to move according to a preset track. During the movement of the preform 20, the stopper 12 abuts against a predetermined bending location 21 of the preform 20 to bend the preform 20 into the insert 22.

The pulling mechanism can grip both ends of the preform 20 to keep the preform 20 in a tensioned state, and the stopper 12 can be bent when being stopped by the stopper 12 during the movement, and the stopper 12 is arranged corresponding to the preset bending position 21 to form a bending structure at the preset position of the preform 20.

The stopper 12 may be fixedly disposed on the first casing 10, or may be movably disposed on the first casing 10, so that the stopper 12 has a first position protruding out of the first surface 11 of the first casing 10 and a second position received in the first casing 10. When the bending of the preform 20 is performed, the stopper 12 is disposed at the first position for stopping the pre-set bending position 21 of the preform 20. After the preform 20 is bent to form the insert 22, the stopper 12 is received in the first mold 10 to integrally mold the insert 22 with the injection molding material.

And S400, matching the first surface 11 of the first mold 10 and the second mold and performing injection molding to form the part to be molded.

The heating time of the heating device can be determined according to needs, optionally, the heating time of the preform by the heating device is not less than 30s and not more than 60s, wherein the heating temperature can be determined according to the material of the preform. Optionally, the melting point of the injection molding material is a first temperature, the heating temperature of the heating device is a second temperature, the difference between the second temperature and the first temperature is not less than 20 ℃ and not more than 50 ℃, and when the injection molding material enters between the first mold body and the second mold body, the injection molding material can act on the surface of the insert 22, so that the insert 22 can be rapidly molded in the molding process and can be kept in a stable state. Wherein the heating time of the preform by the heating device is inversely related to the second temperature.

The heating device may be an infrared oven or the like. Alternatively, the preform 20 may be placed in the heating device and baked for about 40 seconds, the injection molding material is resin, the preform is a fiber reinforced plastic plate, the fiber in the fiber reinforced plastic plate is at least one of glass fiber, carbon fiber and plant fiber, and the heating temperature of the heating device is about 265 ℃, so as to soften the preform 20. When the preform 20 is pulled by the pulling mechanism, the preform 20 encounters a blockage, which causes a bend.

In order to prevent the preform from generating unnecessary deformation, optionally, after the preform is heated, the surface temperature tolerance of each part of the preform is +/-2-3 ℃, so that the temperature of each position of the surface of the preform is relatively balanced, the deformation amount of each position is relatively stable when the bending operation is carried out, and the problem of local thickness unevenness of the embedded part is not easy to occur. When the injection molding material is in contact with the surface of the embedded part, the temperature difference of the surface of the embedded part is relatively small, and the defects that the injection molding material generates bubbles due to uneven temperature and the like can be effectively avoided.

Since the insert 22 is molded on the first mold body 10, a separate mold for the insert 22 is not required, which contributes to a reduction in manufacturing costs. After the insert 22 is molded on the first mold body 10, the second mold body can be quickly assembled with the first mold body 10 for injection molding, so that the number of operation steps is reduced, and the processing efficiency is improved.