1.3.5 megawatt wind generating set gear box primary planet carrier turning process, which is characterized by comprising the following process steps in sequence: and carrying out rough turning processing on the planet carrier, normalizing the casting and carrying out semi-finish turning processing on the planet carrier.

2. The 3.5 megawatt wind generating set gearbox primary planet carrier turning process according to claim 1, characterized in that in the process step of rough turning, the rough turning time allowance is 4mm on one side.

3. The 3.5 megawatt wind generating set gearbox primary planet carrier turning process according to claim 2, wherein the planet carrier is made of a ductile iron 700 material; after semi-finish turning, the tensile strength is more than or equal to 550MPa, the yield strength is more than or equal to 340MPa, the tensile coefficient is more than or equal to 2 percent, and the hardness is 235-280 HB.

4. The 3.5 megawatt wind turbine generator system gearbox primary planet carrier turning process as claimed in claim 3, wherein the total processing time of a single piece is 12.1 hours.

5. The 3.5 megawatt wind generating set gearbox primary planet carrier turning process according to claim 4, characterized in that in the rough turning step, planet carrier hydraulic tools are used for turning the front surface of the planet carrier and the back surface of the planet carrier respectively, the process step of turning the front surface of the planet carrier is a first-order rough machining, and the process step of turning the back surface of the planet carrier is a second-order rough machining.

6. The 3.5 megawatt wind turbine generator system gearbox primary planet carrier turning process according to claim 5, wherein the first-order rough machining comprises the following steps: visual inspection of the surface of the tool: no scrap iron, no sundries, no flash, no burr and no defect; assembling a tool on a workbench according to a design drawing; after assembly, the support is required to be vertical in equal height, and if difference exists, the support is locked after adjustment; the four hanging belts with the hoisting weight of 2 tons are tied respectively and then stably hoisted; the inserts used austria double-ruit CNMG190616G PK 1028;

the secondary rough machining comprises the following steps: visual inspection of the surface of the tool: no scrap iron, no sundries, no flash, no burr and no defect; the workpiece is stably hung by four hanging belts with the hoisting weight of 2 tons; the processed inner circle is used for correcting the concentricity by 0.1 MM; the inserts used austria double-sharp CNMG190616G PK 1028.

7. The 3.5 megawatt wind generating set gearbox primary planet carrier turning process according to claim 6, wherein the planet carrier hydraulic tooling comprises a primary tooling for turning the front surface of the planet carrier and a secondary tooling for turning the back surface of the planet carrier, and the bottoms of the primary tooling and the secondary tooling are provided with reference pin holes which are quickly positioned on a machine tool; a tool bottom plate of the first-order tool is slidably provided with a workpiece support which is driven by a hydraulic part and used for centering and positioning, and a slide rail for sliding the workpiece support is provided with a limiting plate for automatically correcting the workpiece; the bottom of the first-order tool and the bottom of the second-order tool share one tool bottom plate, the tool bottom plate is further provided with a first-order tool upper bottom plate which is used for automatic correction and hydraulic clamping in an adaptive mode, the upper bottom plate is fixedly provided with the slide rail, the slide rail is provided with a slide plate in a sliding mode, and the slide plate is fixedly provided with the workpiece support and a pressing plate which is used for hydraulic clamping of the workpiece.

8. The 3.5 megawatt wind generating set gearbox primary planet carrier turning process as claimed in claim 7, wherein the hydraulic component is a hydraulic cylinder fixedly connected to the upper base plate, the hydraulic cylinder is located below the sliding plate, a two-stage tool ring frame for clamping a workpiece is further arranged on the tool base plate in a matched manner, the ring frame comprises a plurality of annular plates from top to bottom which are fixedly connected through vertical plates, a circular hole in the center of the annular plate is matched with the size of the long axis end of the workpiece, and a plurality of pressing plates for hydraulically clamping the workpiece are fixedly arranged on the annular plate far away from the tool base plate; the workpiece comprises a long shaft end and a short shaft end, a positioning bulge is arranged on one surface of the long shaft end facing the short shaft end, a positioning groove matched with the positioning bulge is formed in the short shaft end, a positioning recess is formed in one surface of the short shaft end far away from the long shaft end, the workpiece further comprises a disc serving as the bottom portion of the workpiece, and a positioning lug matched with the positioning recess is arranged on the disc.

9. The 3.5 megawatt wind generating set gearbox primary planet carrier turning process as claimed in claim 8, wherein the upper bottom plate is further provided with a three-jaw clamping block for centering the bottom part of the workpiece and the short shaft end; the workpiece support for centering positioning is also provided with a stud for positioning the centers of the short shaft end and the long shaft end, and the long shaft end and the short shaft end are provided with threaded through holes matched with the stud.

10. The 3.5 megawatt wind generating set gearbox primary planet carrier turning process according to claim 6, wherein the planet carrier hydraulic tooling comprises a primary tooling for turning the front surface of the planet carrier and a secondary tooling for turning the back surface of the planet carrier, and the bottoms of the primary tooling and the secondary tooling are provided with reference pin holes which are quickly positioned on a machine tool; a pin shaft matched with the reference pin hole is arranged on the lathe, the size of the pin shaft is smaller than that of the reference pin hole, and an annular rubber inflatable air bag is arranged around the pin shaft; the inflation tube of the rubber inflatable air bag passes through a through hole arranged on the machine tool and is connected with the air pump, and the rubber inflatable air bag is in a step ring shape.

Background

The planet carrier is used as a main component of large power equipment, and the material and the strength of the planet carrier body must meet higher requirements. According to the customer specification, the ductile iron 700 material is used, the tensile strength is more than or equal to 550MPa, the yield strength is more than or equal to 340MPa, and the tensile coefficient is more than or equal to 2%. Such as fig. 1 and fig. 2. The hardness is 235-280 HB; in order to meet the requirements, the cast product must be subjected to normalizing heat treatment. However, the normalized material is difficult to process and takes a long time. The current technical schemes include the following two types: after the casting is normalized, carrying out rough turning and semi-finish turning; or firstly carrying out rough turning and semi-finish turning and then normalizing the casting; the disadvantages of the former conventional process scheme are: 1) and the normalizing post-processing is difficult, and rapid/large-cutting-depth turning cannot be realized, so that the processing time of a single piece is as long as more than 20H. 2) The blade/cutter burning is easy to occur in the machining after the normalizing, the cutter cost is high, and the non-machining time is prolonged due to the shutdown treatment. 3) And the material after normalizing is very hard, and the machine tool rigidity is seriously damaged by rough opening for a long time, so that the machine tool precision is reduced by 4), and because 20-25 of the allowance of the surface is removed, the characteristics of the surface of the workpiece obtained by normalizing, such as hardness, become uneven and irregular, and the local area cannot meet the requirements of customers. The disadvantages of the latter process scheme are: 1) and local deformation after heat treatment results in long clamp correction time during finish turning. 2) Local deformation of the workpiece may occur due to the normalizing heat treatment. So that the risk of scrapping due to serious deformation exists 3), the surface is very hard after normalizing heat treatment, and the tool is seriously abraded during finish turning, so that the finish turning is very unfavorable.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provide a 3.5 megawatt wind generating set gear box primary planet carrier turning process which is not normalized and has low rough turning difficulty. The cutter cost is saved and the machine tool precision is protected; the rough turning allowance, single side 4mm, is enough to cover the casting deformation caused by normalizing. After normalizing heat treatment, the single-side margin of 4mm is not calculated too much, and semi-finish turning is not difficult; because the workpiece is roughly turned before heat treatment and the single-side allowance is 4mm, the workpiece is conveniently and quickly clamped during semi-finish turning without correcting the center. After semi-finish turning, the hardest part of the surface is removed, but the removal amount is only about 4mm, so that subsequent finish turning is facilitated, and the strength uniformity of the surface is ensured. The whole man-hour of a single part is reduced to about 12H.

In order to achieve the purpose, the technical scheme of the invention is to design a 3.5 megawatt wind generating set gearbox primary planet carrier turning process, which comprises the following process steps in sequence: and carrying out rough turning processing on the planet carrier, normalizing the casting and carrying out semi-finish turning processing on the planet carrier. Rough turning is carried out before normalizing, the rough turning difficulty is low, and the tool cost is saved and the machine tool precision is protected; the rough turning allowance, single side 4mm, is enough to cover the casting deformation caused by normalizing. After normalizing heat treatment, the single-side margin of 4mm is not calculated too much, and semi-finish turning is not difficult; because the workpiece is roughly turned before heat treatment and the single-side allowance is 4mm, the workpiece is conveniently and quickly clamped during semi-finish turning without correcting the center. After semi-finish turning, the hardest part of the surface is removed, but the removal amount is only about 4mm, which is beneficial to subsequent finish turning and ensures the uniformity of the surface strength. The whole man-hour of a single part is reduced to about 12H.

The further technical scheme is that in the process step of rough turning, the allowance is 4mm when the rough turning is carried out.

The further technical proposal is that the planet carrier is made of ductile iron 700; after semi-finish turning, the tensile strength is more than or equal to 550MPa, the yield strength is more than or equal to 340MPa, the tensile coefficient is more than or equal to 2 percent, and the hardness is 235-280 HB.

The further technical proposal is that the total processing time of the single piece is 12.1 hours.

The technical scheme is that in the step of rough turning, a planet carrier hydraulic tool is used for turning the front surface of the planet carrier and the back surface of the planet carrier respectively, the process step of turning the front surface of the planet carrier is first-order rough machining, and the process step of turning the back surface of the planet carrier is second-order rough machining. Because the bottom of first preface frock and second preface frock all is equipped with the benchmark pinhole of quick location on the lathe, so both frocks have quick locate function. The tool bottom plate of the first-order tool is provided with the workpiece support which is driven by the hydraulic part and used for centering and positioning in a sliding mode, and the sliding rail of the workpiece support is provided with the limiting plate used for automatically correcting the workpiece, so that the workpiece support can be automatically corrected, the workpiece support which is in contact with the bottom surface and the side surface of the workpiece automatically moves to a fixed position after the hydraulic pressure is switched on, and the workpiece is forcefully pushed to a correct position.

The further technical scheme is that the first-order rough machining comprises the following steps: visual inspection of the surface of the tool: no scrap iron, no sundries, no flash, no burr and no defect; assembling a tool on a workbench according to a design drawing; after assembly, the support is required to be vertical in equal height, and if difference exists, the support is locked after adjustment; the four hanging belts with the hoisting weight of 2 tons are tied respectively and then stably hoisted; the inserts used austria double-ruit CNMG190616G PK 1028;

the secondary rough machining comprises the following steps: visual inspection of the surface of the tool: no scrap iron, no sundries, no flash, no burr and no defect; the workpiece is stably hung by four hanging belts with the hoisting weight of 2 tons; the processed inner circle is used for correcting the concentricity by 0.1 MM; the inserts used austria double-sharp CNMG190616G PK 1028.

The technical scheme is that the planet carrier hydraulic tool comprises a first-order tool for turning the front side of the planet carrier and a second-order tool for turning the back side of the planet carrier, and reference pin holes which are quickly positioned on a machine tool are formed in the bottoms of the first-order tool and the second-order tool; a tool bottom plate of the first-order tool is slidably provided with a workpiece support which is driven by a hydraulic part and used for centering and positioning, and a slide rail for sliding the workpiece support is provided with a limiting plate for automatically correcting the workpiece; the bottom of the first-order tool and the bottom of the second-order tool share one tool bottom plate, the tool bottom plate is further provided with a first-order tool upper bottom plate which is used for automatic correction and hydraulic clamping in an adaptive mode, the upper bottom plate is fixedly provided with the slide rail, the slide rail is provided with a slide plate in a sliding mode, and the slide plate is fixedly provided with the workpiece support and a pressing plate which is used for hydraulic clamping of the workpiece.

The hydraulic part is a hydraulic cylinder fixedly connected to an upper base plate, the hydraulic cylinder is positioned below the sliding plate, a two-step tool ring frame for clamping a workpiece is also arranged on the tool base plate in a matched manner, the ring frame comprises a plurality of annular plates from top to bottom which are fixedly connected through vertical plates, a round hole in the center of each annular plate is matched with the size of the long axis end of the workpiece, and a plurality of pressing plates for hydraulically clamping the workpiece are fixedly arranged on the annular plate far away from the tool base plate; the workpiece comprises a long shaft end and a short shaft end, a positioning bulge is arranged on one surface of the long shaft end facing the short shaft end, a positioning groove matched with the positioning bulge is formed in the short shaft end, a positioning recess is formed in one surface of the short shaft end far away from the long shaft end, the workpiece further comprises a disc serving as the bottom portion of the workpiece, and a positioning lug matched with the positioning recess is arranged on the disc.

The further technical proposal is that the upper bottom plate is also provided with a three-jaw clamping block for positioning the bottom part of the workpiece and the center of the short shaft end; the workpiece support for centering positioning is also provided with a stud for positioning the centers of the short shaft end and the long shaft end, and the long shaft end and the short shaft end are provided with threaded through holes matched with the stud.

The other technical scheme is that the planet carrier hydraulic tool comprises a first-order tool for turning the front side of the planet carrier and a second-order tool for turning the back side of the planet carrier, wherein reference pin holes which are quickly positioned on a machine tool are formed in the bottoms of the first-order tool and the second-order tool; a pin shaft matched with the reference pin hole is arranged on the lathe, the size of the pin shaft is smaller than that of the reference pin hole, and an annular rubber inflatable air bag is arranged around the pin shaft; the inflation tube of the rubber inflatable air bag passes through a through hole arranged on the machine tool and is connected with the air pump, and the rubber inflatable air bag is in a step ring shape. According to the arrangement, a hydraulic part, a sliding plate, a support and the like are not needed, automatic centering can be achieved by directly inflating through the rubber inflating air bag, centering efficiency is greatly improved, the rubber inflating air bag can be arranged into a simple ring shape or a stepped ring shape, and the rubber inflating air bag can be suitable for centering of tools with different sizes of reference pin holes < different sizes of corresponding reference pin holes of tools with different sizes > when the rubber inflating air bag is arranged into the stepped ring shape.

The invention has the advantages and beneficial effects that: rough turning is carried out before normalizing, the rough turning difficulty is low, and the tool cost is saved and the machine tool precision is protected; the rough turning allowance, single side 4mm, is enough to cover the casting deformation caused by normalizing. After normalizing heat treatment, the single-side margin of 4mm is not calculated too much, and semi-finish turning is not difficult; because the workpiece is roughly turned before heat treatment and the single-side allowance is 4mm, the workpiece is conveniently and quickly clamped during semi-finish turning without correcting the center. After semi-finish turning, the hardest part of the surface is removed, but the removal amount is only about 4mm, which is beneficial to subsequent finish turning and ensures the uniformity of the surface strength. The whole man-hour of a single part is reduced to about 12H. Because the bottom of first preface frock and second preface frock all is equipped with the benchmark pinhole of quick location on the lathe, so both frocks have quick locate function. The tool bottom plate of the first-order tool is provided with the workpiece support which is driven by the hydraulic part and used for centering and positioning in a sliding mode, and the sliding rail of the workpiece support is provided with the limiting plate used for automatically correcting the workpiece, so that the workpiece support can be automatically corrected, the workpiece support which is in contact with the bottom surface and the side surface of the workpiece automatically moves to a fixed position after the hydraulic pressure is switched on, and the workpiece is forcefully pushed to a correct position. The automatic centering can be realized by directly inflating the rubber inflating air bag without a hydraulic part, a sliding plate, a support and the like, the centering efficiency is greatly improved, the rubber inflating air bag can be arranged into a simple ring shape or a stepped ring shape, and the rubber inflating air bag can be suitable for centering of the tooling with different sizes of reference pin holes < the reference pin holes corresponding to the tooling with different sizes are different in size > by being arranged into the stepped ring shape.

Drawings

FIG. 1 is a schematic view of the working state of a tool in a planet carrier hydraulic tool involved in a 3.5 megawatt wind generating set gearbox primary planet carrier turning process;

FIG. 2 is a schematic view of FIG. 1 with the workpiece removed;

FIG. 3 is a schematic view of the working state of the second-order tool of the present invention;

FIG. 4 is a schematic view of another perspective of FIG. 3;

fig. 5 is a schematic view of a tool in the second embodiment of the invention.

In the figure: 1. a reference pin hole; 2. supporting a workpiece; 3. a limiting plate; 4. a tooling bottom plate; 5. an upper base plate; 6. a slide rail; 7. a slide plate; 8. pressing a plate; 9. a hydraulic part; 10. a circular ring frame; 11. a vertical plate; 12. positioning the projection; 13. positioning the recess; 14. a three-jaw clamping block; 15. a stud; 16. a pin shaft; 17. a rubber inflatable air bag.

Detailed Description

The following description of the embodiments of the present invention will be made with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.

The invention relates to a 3.5 megawatt wind generating set gear box primary planet carrier turning process, which comprises the following process steps in sequence: and carrying out rough turning processing on the planet carrier, normalizing the casting and carrying out semi-finish turning processing on the planet carrier. In the process step of rough turning, the allowance is 4mm when the rough turning is carried out. The planet carrier is made of ductile iron 700; after semi-finish turning, the tensile strength is more than or equal to 550MPa, the yield strength is more than or equal to 340MPa, the tensile coefficient is more than or equal to 2 percent, and the hardness is 235-280 HB. The total processing time of the individual pieces was 12.1 hours. In the step of rough turning, a planet carrier hydraulic tool is used for turning the front side of a planet carrier and the back side of the planet carrier respectively, the process step of turning the front side of the planet carrier is first-order rough machining, and the process step of turning the back side of the planet carrier is second-order rough machining. The first rough machining process includes the following steps: visual inspection of the surface of the tool: no scrap iron, no sundries, no flash, no burr and no defect; assembling a tool on a workbench according to a design drawing; after assembly, the support is required to be vertical in equal height, and if difference exists, the support is locked after adjustment; the four hanging belts with the hoisting weight of 2 tons are tied respectively and then stably hoisted; the inserts used austria double-ruit CNMG190616G PK 1028;

the secondary rough machining comprises the following steps: visual inspection of the surface of the tool: no scrap iron, no sundries, no flash, no burr and no defect; the workpiece is stably hung by four hanging belts with the hoisting weight of 2 tons; the processed inner circle is used for correcting the concentricity by 0.1 MM; the inserts used austria double-sharp CNMG190616G PK 1028.

The first embodiment is as follows:

as shown in fig. 1 to 4, the planet carrier hydraulic tool comprises a first-order tool for turning the front surface of the planet carrier and a second-order tool for turning the back surface of the planet carrier, and the bottoms of the first-order tool and the second-order tool are provided with reference pin holes 1 which are quickly positioned on a machine tool; the tool bottom plate 4 of the first-order tool is provided with a workpiece support 2 which is driven by a hydraulic part 9 and used for centering and positioning in a sliding way, and a limiting plate 3 used for automatically correcting the workpiece is arranged on a sliding rail 6 of the workpiece support 2. The bottom of the first-order tool and the bottom of the second-order tool share one tool bottom plate 4, the tool bottom plate 4 is further provided with a first-order tool upper bottom plate 5 which is used for automatic correction and hydraulic clamping in an adaptive mode, the upper bottom plate 5 is fixedly provided with the sliding rail 6, the sliding rail 6 is provided with a sliding plate 7 in a sliding mode, and the sliding plate 7 is fixedly provided with the workpiece support 2 and a pressing plate 8 which is used for hydraulic clamping of the workpiece. The hydraulic part 9 is a hydraulic cylinder fixedly connected to the upper bottom plate 5 and located below the sliding plate 7. Still the adaptation is equipped with a two preface frock ring frame 10 that is used for pressing from both sides tight work piece on the frock bottom plate 4, and ring frame 10 is fixed continuous through vertical board 11 including a plurality of annular plates from top to bottom, the round hole at annular plate center and the major axis end size looks adaptation of work piece. A plurality of pressing plates 8 for hydraulically clamping the workpiece are fixedly arranged on the annular plate far away from the tool bottom plate 4; the workpiece comprises a long shaft end and a short shaft end, wherein a positioning bulge 12 is arranged on one surface of the long shaft end facing the short shaft end, a positioning groove matched with the positioning bulge 12 is formed in the short shaft end, a positioning recess 13 is formed in one surface of the short shaft end far away from the long shaft end, the workpiece further comprises a disc serving as the bottom part of the workpiece, and a positioning lug matched with the positioning recess 13 is arranged on the disc. The upper bottom plate 5 is also provided with a three-jaw clamping block 14 for positioning the bottom part of the workpiece and the center of the short shaft end; the workpiece support 2 for centering positioning is also provided with a stud 15 for centering positioning of a short shaft end and a long shaft end, and the long shaft end and the short shaft end are provided with threaded through holes matched with the stud 15.

Example two:

the difference from the first embodiment is that, as shown in fig. 5, the planet carrier hydraulic tool comprises a first-order tool for turning the front side of the planet carrier and a second-order tool for turning the back side of the planet carrier, and the bottoms of the first-order tool and the second-order tool are provided with reference pin holes which are quickly positioned on a machine tool; a pin shaft 16 matched with the reference pin hole is arranged on the lathe, the size of the pin shaft is smaller than that of the reference pin hole, and an annular rubber inflatable air bag 17 is arranged around the pin shaft; the inflation tube of the rubber inflatable air bag passes through a through hole arranged on the machine tool and is connected with the air pump, and the rubber inflatable air bag is in a step ring shape.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the technical principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.