A kind of processing method of piston forging die

A processing method and mold technology, applied in the field of mold processing, can solve problems such as difficult processing and short service life of piston molds, and achieve the effects of reducing electrode consumption, improving processing efficiency and stable performance.

Active Publication Date: 2018-01-02
MAANSHAN CHANGYE HEAVY IND TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the shortcomings of short service life and difficult processing of piston dies in the prior art, and provide a processing method for piston forging dies. The technical proposal of the present invention improves the die material and processing technology by improving the The processing accuracy of the mold reduces the fatigue and crack phenomenon of the mold and prolongs the service life of the mold

Method used

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  • A kind of processing method of piston forging die

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Effect test

Embodiment 1

[0035] combine figure 1 , the processing method of a kind of piston forging die of the present embodiment, its processing step is:

[0036] Step 1. Raw material preparation, using a round bar blank to prepare for forging; the composition of the round bar blank is calculated by weight percentage: C: 0.43%, Si: 1.10%, Mn: 0.42%, S: ≤0.010%, P: ≤ 0.015%, Cr: 5.0%, Ni: 0.08%, Cu: 0.010%, Mo: 1.25%, and the balance is Fe.

[0037] Step 2. Forging the material with three piers and three pulls, the forging ratio of the round bar blank to the blank after forging is 3.8;

[0038] The specific forging process is as follows: heating the blank to 1090°C for the first pier thickening and elongation forging, the forging ratio is 1.7, which is the height ratio after one pier thickening and elongation processing; then the blank Heating to 860°C, carry out the second thickening and elongating forging, the forging ratio is 1.6; after the second forging, heat the workpiece to 860°C, and perfor...

Embodiment 2

[0064] A kind of processing method of automobile one-axis forging mold of the present embodiment, its processing steps are:

[0065] Step 1. Raw material preparation, using a round bar blank to prepare for forging; the composition of the round bar blank is calculated by weight percentage: C: 0.41%, Si: 1.08%, Mn: 0.42%, S: ≤0.010%, P: ≤ 0.015%, Cr: 5.2%, Ni: 0.08%, Cu: 0.010%, Mo: 1.25%, and the balance is Fe.

[0066] Step 2. Forging the material with three piers and three pulls, the forging ratio of the round bar blank to the forged blank is 4;

[0067] The specific forging process is as follows: heating the blank to 1100°C for the first pier thickening and elongation forging with a forging ratio of 1.8; then heating the blank to 900°C for the second pier thickening and elongation forging, The forging ratio is 1.6; after the second forging, the workpiece is heated to 860°C, and the third forging pier is thickened and elongated, and the forging ratio is 1.4; after the third ...

Embodiment 3

[0080] A kind of processing method of automobile one-axis forging mold of the present embodiment, its processing steps are:

[0081] Step 1. Raw material preparation, using a round bar blank to prepare for forging; the components of the round bar blank are calculated by weight percentage: C: 0.42%, Si: 1.08%, Mn: 0.41%, S: ≤0.010%, P: ≤ 0.015%, Cr: 5.0%, Ni: 0.10%, Cu: 0.009%, Mo: 1.25%, and the balance is Fe.

[0082] Step 2. Forging the material with three piers and three pulls, the forging ratio of the round bar blank to the forged blank is 4;

[0083] The specific forging process is as follows: heating the blank to 1100°C for the first thickening and elongating forging with a forging ratio of 1.8; then heating the blank to 880°C for the second thickening and elongating forging. The forging ratio is 1.6; after the second forging, the workpiece is heated to 880°C, and the third forging pier is thickened and elongated, and the forging ratio is 1.4; after the third forging, t...

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Abstract

The invention discloses a machining method for a piston forging mould, belonging to the field of mould machining. The machining method comprises the following machining steps that raw materials are prepared, namely a rod material is subjected to three-upsetting and three-drawing forging process, wherein the forging ratio is 3.8-4; then annealing is performed, and a blank subjected to annealing is machined; then the blank is subjected to four times of electrosparking after rough machining, so that a cavity is machined in place; then quenching and three times of tempering are performed, so that the hardness of the mould reaches 46-47; and finally finish machining is performed, and then a fourth time of tempering is performed, so that cutting stress is removed. According to the technical scheme of the machining method, the components of materials and the machining process are improved, so that the mechanical performance of the forging mould is improved; the machining precision of the mould is improved; the phenomena of fatiguing and cracking of the mould are alleviated; and the service life of the mould is prolonged.

Description

technical field [0001] The invention relates to the technical field of die processing, and more specifically, relates to a processing method of a piston forging die. Background technique [0002] The piston is the "heart" of the automobile engine. It bears alternating mechanical loads and thermal loads. It is one of the key components in the engine with the worst working conditions. The function of the piston is to bear the gas pressure and transmit it to the connecting rod through the piston pin. The crankshaft rotates and the top of the piston is also part of the combustion chamber. [0003] The key point of the steel piston lies in the forging technology, and the core of the forging technology lies in the forging mold. The precision and service life of the forging mold affect the quality of the piston; the higher the precision of the piston mold, the higher the precision of the corresponding forged piston ;Through different processing procedures, the wear of the mold can...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P15/24
CPCB23P15/24
Inventor 程圣群夏大亭
Owner MAANSHAN CHANGYE HEAVY IND TECH
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