Hard alloy stop block and compression molding process

A compression molding, hard alloy technology, applied in the direction of metal processing equipment, machines/engines, liquid fuel engines, etc., can solve the problems of instability, sintering cracking, high cost, etc., to reduce shrinkage, ensure uniform shrinkage, and ensure The effect of molding quality

Active Publication Date: 2020-12-04
宁波新宇硬质合金密封有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing stop block is to sinter a blank first, and then use a pulse gun to remove the edge and punch out the required stepped shape. This method makes the processing of the hard alloy stop block more difficult and expensive, which restricts the Its development and application, how to directly press and form parts with complex geometric shapes and wear resistance under the premise of ensuring the needs of users is one of the development trends of the cemented carbide industry. The mold of the cemented carbide stop block refers to the Chinese patent whose notification number is CN210817457U, but in the process of actual use, the billet is unstable after forming, which leads to the phenomenon of cracking easily during sintering

Method used

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  • Hard alloy stop block and compression molding process
  • Hard alloy stop block and compression molding process
  • Hard alloy stop block and compression molding process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A molding process of a hard alloy stop block, comprising the steps of:

[0042] S1: Mix 0.3kg of cobalt powder, 8.2kg of metal nickel powder, and 91.5kg of tungsten carbide powder; wherein, the particle size of tungsten carbide is 1-2μm, and the mass fraction of carbon in tungsten carbide is 5.9%;

[0043] S2: wet grinding the mixture obtained in step S1 to obtain a slurry with a particle size of less than 1 μm;

[0044] S3: drying, drying the slurry obtained in step S2, and then adding 140 mL / kg, 18% mass concentration of SBS emulsion to the dry matter, and stirring evenly;

[0045] S4: Compression molding, at a pressure of 1.5t / cm 2 Under the condition that step S3 obtains the material granule press-molded to get the rough piece; In the process of press-molding, mold adopts announcement number to be that the mold disclosed by CN210817457U carries out press-molding, with reference to figure 2 and image 3, when in use, place the mandrel 5 on the lower die 1, then i...

Embodiment 2

[0055] A molding process of a hard alloy stop block, comprising the steps of:

[0056] S1: Mix 0.5kg of cobalt powder, 7.9kg of metal nickel powder, and 91.6kg of tungsten carbide powder; among them, the particle size of tungsten carbide is 1-2μm, and the mass fraction of carbon in tungsten carbide is 5.92%;

[0057] S2: wet grinding the mixture obtained in step S1 to obtain a slurry with a particle size of less than 1 μm;

[0058] S3: drying, drying the slurry obtained in step S2, and then adding 145 mL / kg, 16% mass concentration of SBS emulsion to the dry matter, and stirring evenly;

[0059] S4: Compression molding, at a pressure of 1.2t / cm 2 Under the condition that step S3 obtains the material granule press-molded to get the rough piece; In the process of press-molding, mold adopts announcement number to be that the mold disclosed by CN210817457U carries out press-molding, with reference to figure 2 and image 3 , when in use, place the mandrel 5 on the lower die 1, t...

Embodiment 3

[0069] A molding process of a hard alloy stop block, comprising the steps of:

[0070] S1: Mix 0.7kg of cobalt powder, 7.5kg of metal nickel powder, and 91.8kg of tungsten carbide powder; among them, the particle size of tungsten carbide is 1-2μm, and the mass fraction of carbon in tungsten carbide is 5.95%;

[0071] S2: wet grinding the mixture obtained in step S1 to obtain a slurry with a particle size of less than 1 μm;

[0072] S3: drying, drying the slurry obtained in step S2, and then adding 130 mL / kg, 20% mass concentration of SBS emulsion to the dry matter, and stirring evenly;

[0073] S4: Compression molding, at a pressure of 1.5t / cm 2 Under the condition that step S3 obtains the material granule press-molded to get the rough piece; In the process of press-molding, mold adopts announcement number to be that the mold disclosed by CN210817457U carries out press-molding, with reference to figure 2 and image 3 , when in use, place the mandrel 5 on the lower die 1, t...

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Abstract

The invention discloses a hard alloy stop block and a compression molding process. According to the technical scheme, the compression molding process is characterized by comprising the following stepsof S1, mixing cobalt powder, metal nickel powder and tungsten carbide powder; S2, carrying out wet grinding on the mixture to obtain thick liquid; S3, drying the thick liquid, and then adding a forming agent to obtain particles; S4, performing compression molding to obtain a blank; and S5, sintering, in the first stage, raising the temperature from room temperature to 345-355 DEG C and then keeping the temperature; in the second stage, raising the temperature to 370-375 DEG C and then keeping the temperature, in the third stage, raising the temperature to 490-510 DEG C and then keeping the temperature, in the fourth stage, raising the temperature to 780-810 DEG C and then keeping the temperature, in the fifth stage, raising the temperature to 1180-1200 DEG C and then keeping the temperature, in the sixth stage, raising the temperature to 1440-1450 DEG C and then keeping the temperature, in the seven stage, cooling. The compression molding process has the effects that the molding quality of the blank is improved, so that the uniform shrinkage during sintering is ensured, and the cracking is prevented.

Description

technical field [0001] The application relates to the technical field of cemented carbide processing, in particular to a cemented carbide stop block and a molding process. Background technique [0002] With the rapid development of the industry of the times, the operating speed of various equipment has been greatly increased, and higher requirements have been placed on the wear resistance of equipment parts. Therefore, wear-resistant parts made of cemented carbide parts replace wear-resistant parts made of various alloy steels. Came into being. Cemented carbide is an alloy material made of hard compounds of refractory metals and bonded metal barrel covers by non-ink metallurgy. Cemented carbide has high hardness, wear resistance, good strength and toughness, heat resistance, and Corrosion and other excellent performance. [0003] The stop block is a commonly used part in the pump body, and its shape is multi-step, refer to figure 1 , the stop block 6 includes a connecting...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F5/00B22F3/02B22F3/10B22F1/00C22C29/08F04B53/22
CPCB22F5/00B22F3/02B22F3/1017B22F3/1021C22C29/08C22C29/067F04B53/22B22F1/10
Inventor 曲凡波刘宁嵘
Owner 宁波新宇硬质合金密封有限公司
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