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Precision forging forming method of cam slices

A cam piece and precision forging technology, applied in metal processing equipment, etc., can solve the problems of low mold life, low dimensional accuracy, cracking, etc., and achieve the effect of good mold durability and low energy consumption

Active Publication Date: 2015-11-11
HANGZHOU XZB TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 1. The temperature is high and the dimensional accuracy is low, so more machining allowance needs to be reserved for post-processing grinding;
[0007] 2. During and at the end of the forging process, as long as the temperature exceeds the phase transition temperature, the local structure of the part may change, such as: local hardening, transforming into a sheet structure, and there is a risk of cracking; therefore, it must be annealed in time after forging deal with
[0008] 3. High hot forging temperature and low die life
[0009] Advantages of cold forging: high forging dimensional accuracy at room temperature; Disadvantages: for high carbon steels such as GCr15, 100Cr6, large deformation resistance, easy cracking, and low die life

Method used

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  • Precision forging forming method of cam slices

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A precision forging forming method of a cam plate is characterized in that the method comprises:

[0034] (1) Large deformation forging of the first mold, put the wire rod into the first mold for forging, and form the basic embryo body including the peach tip;

[0035] (2) Warm and cold forging, in the multi-station forging process, the heating temperature of the material is not higher than the phase transition temperature of the workpiece, and then the temperature of the workpiece in the station gradually decreases;

[0036] (3) Pre-biasing into the mold, pre-biasing the wire to the peach tip of the first mold, and then performing subsequent forging.

[0037] The material heating temperature is 600-750°C.

[0038] The multi-station forging includes at least five stations.

[0039] During the forging process of the first station, the cut material is pre-biased towards the tip of the forging die, and then sent to the first station to complete the filling of the materia...

Embodiment 2

[0041] A precision forging forming method of a cam plate is characterized in that the method comprises:

[0042] (1) Large deformation forging of the first mold, the material is cut to form a blank, put into the first mold of the first station for forging, and a workpiece including the peach tip is formed; the first mold completes more than 60% of the total forging deformation, so that the subsequent The amount of deformation of each station gradually decreases under the condition of temperature drop;

[0043] (2) Warm and cold forging. In the multi-station forging process, the temperature of the workpiece in the first station is close to but not higher than the phase transition temperature of the workpiece, and the temperature of the workpiece in the subsequent stations gradually decreases. Additional cooling is applied to the two stations to reduce the temperature of the blank and implement a fine shaping close to cold forging;

[0044] (3) Pre-biasing into the mold, pre-bi...

Embodiment 3

[0050] A precision forging forming method of a cam plate is characterized in that the method comprises:

[0051] (1) Large deformation forging of the first mold, the material is cut to form a blank, put into the first mold of the first station for forging, and a workpiece including the peach tip is formed; the first mold completes 65% of the forging deformation, so that subsequent processes Under the condition of temperature drop, the amount of deformation gradually decreases;

[0052] (2) Warm and cold forging. In the multi-station forging process, the temperature of the workpiece in the first station is close to but not higher than the phase transition temperature of the workpiece, and the temperature of the workpiece in the subsequent stations gradually decreases. Additional cooling is applied to the two stations to reduce the temperature of the blank and implement a fine shaping close to cold forging;

[0053] (3) Pre-biasing into the mold, pre-biasing the wire to the pea...

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Abstract

The invention discloses a precision forging forming method of a cam slice. The method comprises the steps that firstly, sample large deformation forging is conducted, wherein heated materials are cut off to form blanks which are placed in a first die at the first station, and workpieces including peach tip parts are formed, 60% or more of the total forging deformation is finished by the first die, and the deformation of the following stations is reduced step by step under the condition that the temperature is reduced; secondly, warm and cold forging is conducted, wherein in the multi-station forging process, the temperature of the heated materials is close to but not higher than the phase-change temperature of the workpieces, the temperature of the workpieces at the following stations is gradually reduced, extra cooling is conducted at the last station or the last two stations to reduce the temperature of the workpieces, and precision shaping of cold forging is conducted; thirdly, pre-inclining die imbedding is conducted, wherein a wire is made to deviate towards the peach tip of the first die in advance, and then following forging is conducted. The size precision is located between the cold forging and hot forging and is closer to cold forging; the die is good in durability; metallographic structures of parts cannot change, and there is no need to conduct annealing; the energy consumption is lower than that of hot forging.

Description

technical field [0001] The invention relates to a precision forging forming method of a cam piece. Background technique [0002] The traditional camshaft manufacturing method mainly adopts integral casting or integral forging of the camshaft blank, and then cuts it for production. This traditional method is difficult to manufacture a compact camshaft with densely arranged cam plates. Moreover, the traditional method of manufacturing camshafts not only turns a large amount of materials into waste, but also makes it difficult to reduce the weight of the parts. The assembled camshaft is to install independent cam pieces on a steel pipe, which will be the future development direction. It is characterized by small mass, high fatigue strength, large allowable contact stress of the cam, good manufacturability and low manufacturing cost. [0003] At present, the precision forging forming method of high-carbon steel cams (such as bearing steel, spring steel) is mainly hot forging t...

Claims

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Application Information

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IPC IPC(8): B21J5/02
Inventor 徐纳
Owner HANGZHOU XZB TECH