1. Cutting edge material, characterized by: the cutting edge is made of hard alloy.

2. A cutting edge material as claimed in claim 1 wherein: the hardness of the hard alloy is 82-95 HRA.

3. The cutting edge material as claimed in claim 1, which is prepared from the following components in percentage by mass:

75-95% of tungsten carbide,

5 to 25 percent of cobalt,

0.2 to 2.5 percent of tantalum-niobium composite carbide,

0.00001 to 0.003 percent of cerium nitrate,

the sum of the mass percentages of the components is 100 percent.

4. The cutting edge material as claimed in claim 1, which is prepared from the following components in percentage by mass:

60 to 90 percent of tungsten carbide,

8 to 20 percent of cobalt,

0.5 to 1.5 percent of tantalum-niobium composite carbide,

0.0001 to 0.002 percent of cerium nitrate,

the sum of the mass percentages of the components is 100 percent.

5. A cutting edge material according to claim 3 or 4, wherein: the tungsten carbide, the cobalt, the tantalum-niobium composite carbide and the cerium nitrate are all powder, and the particle sizes of the tungsten carbide and the cobalt are 0.2-2.0 um.

6. The method for manufacturing a cutting edge material according to claim 5, wherein: the powder of each component is evenly mixed, molded and sintered to obtain the powder.

7. Wear-resisting pincers, include the binding clip and set firmly in shearing sword on the binding clip, characterized by: the shearing blade is made of hard alloy, and the material of the clamp head is different from that of the shearing blade.

8. Wear-resisting pincers, include the binding clip and set firmly in shearing sword on the binding clip, characterized by: the cutting edge is made of a cutting edge material different from that of the tong head, the tong head and the cutting edge are made of different materials, and the cutting edge material comprises the following components in percentage by mass:

75-95% of tungsten carbide,

5 to 25 percent of cobalt,

0.2 to 2.5 percent of tantalum-niobium composite carbide,

0.00001 to 0.003 percent of cerium nitrate,

the sum of the mass percentages of the components is 100 percent.

9. A wear clamp in accordance with claim 8, wherein: the cutting edge material comprises the following components in percentage by mass:

60 to 90 percent of tungsten carbide,

8 to 20 percent of cobalt,

0.5 to 1.5 percent of tantalum-niobium composite carbide,

0.0001 to 0.002 percent of cerium nitrate,

the sum of the mass percentages of the components is 100 percent.

10. A method of manufacturing a wear-resistant pliers as claimed in claim 7, 8 or 9, wherein: the cutting edge is welded or/and assembled on the jaw.

Background

The existing pliers are usually made of a material, the shearing blade and the pliers head are directly machined on the pliers head, the user often breaks the edge in the using process, the abrasion of the edge seriously causes the life of the shearing blade to be seriously reduced, and the requirements of the user on the abrasion resistance and the hardness of the shearing blade cannot be met. Some present bimetal pincers, the shearing sword adopts alloy steel, and the binding clip adopts ordinary steel, forms through welding process, though hardness and wearability have certain promotion, nevertheless still exist the use in the jaw and break open, the serious and then problem that the shearing life reduces of wearing and tearing.

Disclosure of Invention

The invention aims to solve the technical problems and provide a pair of wear-resistant pliers and a manufacturing method thereof, and aims to overcome the defects of jaw breakage, serious abrasion and reduced shearing life of the conventional pliers in the using process.

In order to achieve the purpose, the cutting edge material is hard alloy.

Preferably, the hardness of the cemented carbide is 82-95 HRA.

Preferably, the cutting edge material disclosed by the invention comprises the following components in percentage by mass:

75-95% of tungsten carbide,

5 to 25 percent of cobalt,

0.2 to 2.5 percent of tantalum-niobium composite carbide,

0.00001 to 0.003 percent of cerium nitrate,

the sum of the mass percentages of the components is 100 percent.

Preferably, the cutting edge material disclosed by the invention comprises the following components in percentage by mass:

60 to 90 percent of tungsten carbide,

8 to 20 percent of cobalt,

0.5 to 1.5 percent of tantalum-niobium composite carbide,

0.0001 to 0.002 percent of cerium nitrate,

the sum of the mass percentages of the components is 100 percent.

Preferably, the tungsten carbide, the cobalt, the tantalum-niobium composite carbide and the cerium nitrate are all powder, and the particle sizes of the tungsten carbide and the cobalt are 0.2-2.0 um.

In order to achieve the aim, the manufacturing method of the cutting edge material comprises the following steps: the powder of each component is evenly mixed, molded and sintered to obtain the powder.

In order to achieve the purpose, the wear-resistant pliers comprise a pliers head and a shearing edge fixedly arranged on the pliers head, wherein the shearing edge is made of hard alloy, and the pliers head and the shearing edge are made of different materials.

In order to achieve the above purpose, another wear-resistant pliers of the present invention comprises a pliers head and a cutting edge fixedly arranged on the pliers head, wherein the cutting edge is made of a cutting edge material different from the pliers head, the pliers head and the cutting edge are made of different materials, and the cutting edge material comprises the following components by mass:

75-95% of tungsten carbide,

5 to 25 percent of cobalt,

0.2 to 2.5 percent of tantalum-niobium composite carbide,

0.00001 to 0.003 percent of cerium nitrate,

the sum of the mass percentages of the components is 100 percent.

Preferably, the cutting edge material consists of the following components in percentage by mass:

60 to 90 percent of tungsten carbide,

8 to 20 percent of cobalt,

0.5 to 1.5 percent of tantalum-niobium composite carbide,

0.0001 to 0.002 percent of cerium nitrate,

the sum of the mass percentages of the components is 100 percent.

In order to achieve the above purpose, the method for manufacturing the wear-resistant pliers comprises the step of welding or/and assembling the cutting edges on the pliers head.

According to the invention, the material of the shearing blade is improved, the hardness and the wear resistance of the shearing blade are improved, the problem of short shearing life of the cutting edge of the existing pliers is solved, and the shearing life of the cutting edge is greatly prolonged.

Drawings

FIG. 1 is a schematic view of a wear-resistant pliers according to the present invention;

FIG. 2 is an exploded view of a wear-resistant pliers according to the present invention;

FIG. 3 is a schematic structural view of a binding clip of the wear-resistant pliers of the present invention;

FIG. 4 is a schematic view of another structure of the head of the wear-resistant pliers of the present invention;

FIG. 5 is a schematic orthographic view of a cutting edge according to the present invention;

FIG. 6 is a schematic orthographic view of another shearing edge of the present invention;

the reference numbers in the figures illustrate:

11 a first handle part, 12 a first clamp head, 13 a groove and 14 clamping pins;

21 a second handle part, 22 a second clamp head, 23 a groove and 24 clamping pins;

31 cutting edge, 32 cutting edge.

Detailed Description

The invention is further described below with reference to the accompanying drawings.

As shown in fig. 1-2, the wear-resistant pliers of the present invention comprise a first pliers body and a second pliers body connected together by a pivot, wherein a first handle 11 of the first pliers body and a second handle 21 of the second pliers body correspond to each other for a user to hold and operate, and a first head of the first pliers body and a second head of the second pliers body are matched to realize cutting. In the present invention, the first head and the second head are respectively configured by attaching the cutting edge 31 shown in fig. 6 or the cutting edge 32 shown in fig. 5 to the first jaw 12 and the second jaw 22.

The cutting edge may be welded to the first and second jaws as shown in fig. 1 by the following method:

a. pre-fixing the shearing blades on the corresponding pliers heads;

b. coating a brazing material on the joint of the clamp heads corresponding to the shearing edges;

c. brazing in a brazing furnace at the temperature of 1000 ℃ and 1200 ℃;

d. carrying out heat treatment on the whole pliers after brazing;

e. grinding, shaping and polishing the pliers;

f. and (6) surface treatment.

The cutting edges may also be riveted to the first and second jaws by means of bayonet pins 14, 24 as shown in figure 2.

Particularly, the shearing edges are preassembled on the corresponding clamp heads by the clamping pins and then welded, so that the positions of the shearing edges can be ensured, and the cutting edges of the two shearing edges are aligned.

In any assembly mode, in order to maintain the coordination of the first head part and the second head part, the first head part and the second head part are respectively provided with a groove, the shearing blade is assembled in the groove, when the clamping pin is used for riveting, through holes are respectively arranged on the shearing head, the first clamping head and the second clamping head so as to conveniently penetrate through the corresponding clamping pin, and the through holes and the clamping pins can be circular as shown in figures 2-3 and 6 or square as shown in figure 5.

The cutting edge is made of a cutting edge material different from that of the head of the pliers, generally, the head of the pliers and the handle of the pliers are integrally forged by carbon steel, and the cutting edge material can be hard alloy. Preferably, the cutting edge material is prepared from tungsten carbide, cobalt, tantalum-niobium composite carbide and cerium nitrate, and the cutting edge material comprises the following components in percentage by mass: 75-95% of tungsten carbide, 5-25% of cobalt, 0.2-2.5% of tantalum-niobium composite carbide, 0.00001-0.003% of cerium nitrate, and the sum of the mass percentages of the components is 100; or 60-90% of tungsten carbide, 8-20% of cobalt, 0.5-1.5% of tantalum-niobium composite carbide and 0.0001-0.002% of cerium nitrate, wherein the sum of the mass percentages of the components is 100%. The tungsten carbide, cobalt, tantalum-niobium composite carbide and cerium nitrate are all powder, the tungsten carbide and the cobalt are crushed to powder granularity of 0.2-2.0um, and the tantalum-niobium composite carbide and the cerium nitrate are obtained according to the powder granularity purchased in the market.

The hard alloy prepared from tungsten carbide, cobalt, tantalum-niobium composite carbide and cerium nitrate is obtained according to the following process: the powder of each component is evenly mixed, molded and sintered to obtain the powder. By this process, the shear blade blank can be directly formed by die pressing and finally can be used for assembly by grinding.

In the composition of tungsten carbide with cobalt, tantalum-niobium composite carbide and cerium nitrate defined in the present invention, the applicant carried out the examples described in table 1:

TABLE 1 (Unit: percent by mass)

Table 1 the hardness of the cutting edge of each example versus the hardness of the carbon steel cutting edge is given in table 2:

TABLE 2 (Unit: HV 1.0)

Table 1 shear life of the shear edge of each example versus the shear life of the carbon steel shear edge as in table 3:

TABLE 3 (Unit: mm)