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Manufacturing and strengthening method of lower core connecting rod in compression molding machine

A molding machine and connecting rod technology, applied in the direction of manufacturing tools, furnace types, process efficiency improvement, etc., can solve the problems of insufficient strength, breaking, and reducing the economic benefits of enterprises, so as to avoid decarburization and oxidation, improve strength, The effect of improving mechanical properties

Active Publication Date: 2021-04-27
HUNAN UNIV OF HUMANITIES SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the material of the lower core connecting rod of the molding machine is mainly quenched and tempered 45 steel, but it is found in use that the pin hole in the lower core connecting rod is gradually elongated or even broken under the continuous large cyclic load , indicating that its strength is obviously insufficient and needs to be further improved
Due to the frequent replacement of the failed lower core connecting rod, the labor intensity of the workers is greatly increased and the production progress of the product is seriously affected, which reduces the economic benefits of the enterprise.

Method used

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  • Manufacturing and strengthening method of lower core connecting rod in compression molding machine

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Such as figure 1 As shown, the structure of the lower core connecting rod includes axial through hole 1, radial through hole 2 and thread 3, and 35CrMo alloy structural steel is selected as the material for manufacturing the lower core connecting rod.

[0018] Quenching and tempering treatment of the lower core connecting rod made of 35CrMo alloy structural steel;

[0019] After the quenching and tempering treatment is completed, based on the design drawing of the lower core connecting rod, the blank of the lower core connecting rod is processed into the designed size;

[0020] Inductively heat the end of the lower core connecting rod with a radial through hole, and uniformly heat to 850°C within the range from the end with the radial through hole to 15mm below it, and at the end with the radial through hole In the range of 15mm to 80mm below the bottom, there is a temperature gradient heating, that is, the temperature at 80mm below the end with the radial through hole...

Embodiment 2

[0024] 35CrMo alloy structural steel is selected as the material for the manufacture of the lower core connecting rod.

[0025] Quenching and tempering treatment of the lower core connecting rod made of 35CrMo alloy structural steel;

[0026] After the quenching and tempering treatment is completed, based on the design drawing of the lower core connecting rod, the blank of the lower core connecting rod is processed into the designed size;

[0027] Inductively heat the end of the lower core connecting rod with a radial through hole, and uniformly heat to 865°C from the end of the end with the radial through hole to 15mm below it, and at the end of the end with the radial through hole In the range of 15mm to 80mm below the bottom, there is a temperature gradient heating, that is, the temperature at 80mm below the end with the radial through hole is the lowest, which is 200°C, and 15mm below the end with the radial through hole The highest temperature is 865°C, and the temperatu...

Embodiment 3

[0031] 35CrMo alloy structural steel is selected as the material for the manufacture of the lower core connecting rod.

[0032] Quenching and tempering treatment of the lower core connecting rod made of 35CrMo alloy structural steel;

[0033] After the quenching and tempering treatment is completed, based on the design drawing of the lower core connecting rod, the blank of the lower core connecting rod is processed into the designed size;

[0034] Inductively heat the end of the lower core connecting rod with a radial through hole, and uniformly heat to 875°C within the range from the end with the radial through hole to 15mm below it, and at the end with the radial through hole In the range of 15mm to 80mm below the bottom, there is a temperature gradient heating, that is, the temperature at 80mm below the end with the radial through hole is the lowest, which is 200°C, and 15mm below the end with the radial through hole The highest temperature is 875°C, and the temperature gr...

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Abstract

The invention discloses a method for manufacturing and strengthening a lower core connecting rod in a compression molding machine, belonging to the field of compression molding machine manufacturing. The present invention selects 35CrMo alloy steel as the material of the lower core connecting rod, and the manufacturing and strengthening process of the lower core connecting rod mainly includes: quenching and tempering the lower core connecting rod blank, and carrying out one end of the lower core connecting rod having a radial through hole. Induction heating followed by oil cooling; final overall heat treatment of the induction heated and cooled lower core connecting rod. The present invention adopts the above method to manufacture and strengthen the lower core connecting rod in the compression molding machine, which not only simplifies the manufacturing process and reduces the manufacturing difficulty, but also greatly improves the overall strength of the lower core connecting rod and greatly improves the strength of the lower core connecting rod. Improve the comprehensive mechanical properties of its prone to failure parts.

Description

technical field [0001] The invention relates to a method for manufacturing and strengthening a connecting rod, in particular to a method for manufacturing and strengthening a lower core connecting rod made of 35CrMo in a molding machine. Background technique [0002] As we all know, compression molding has been widely used in the fields of powder metallurgy product blanks and plastic product molding. The compression molding machine is one of the most important equipment in the compression molding process, which contains more connecting mechanisms, such as the lower core connecting rod. In the molding process, the lower core connecting rod plays the role of transmitting force. On the other hand, due to the process characteristics of mass production of molding, the lower core connecting rod continuously bears large cyclic loads during production, which requires that it must be It has both high strength and good ductility. [0003] At present, the material of the lower core c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D9/00C21D1/25C21D1/10C21D6/00C21D1/773C21D1/74
CPCC21D1/10C21D1/25C21D1/74C21D1/773C21D6/002C21D9/0075C21D2221/00Y02P10/25
Inventor 魏祥陈志国顾娆
Owner HUNAN UNIV OF HUMANITIES SCI & TECH