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Production, calculation, heating and verification method for reducing strength difference of mandrel

A production method and mandrel technology, applied in heat treatment furnaces, heat treatment equipment, heat treatment process control, etc., can solve problems such as difficult selection of unqualified products, and achieve the effect of improving yield and reducing strength difference

Active Publication Date: 2022-03-29
ZHEJIANG ODM TRANSMISSION TECH
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Problems solved by technology

[0004] In view of the above-mentioned related technologies, the inventor believes that the sampling inspection infers the quality of the entire batch of products based on the inspection results of the products in the sample, so there is a defect that it is difficult to select unqualified products

Method used

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  • Production, calculation, heating and verification method for reducing strength difference of mandrel
  • Production, calculation, heating and verification method for reducing strength difference of mandrel
  • Production, calculation, heating and verification method for reducing strength difference of mandrel

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Embodiment Construction

[0074] The embodiment of the present application discloses a heating method for controlling the depth of the quench hardened layer. The above-mentioned heating method in the embodiment of the present application heats the mandrel made of 40Cr material. The requirements of the mandrel are: the surface hardness after quenching is HRC52-57, and the static torsional strength is 1500-1800 N·m. The following application will provide further details.

[0075] A production, calculation, heating and verification method for reducing the difference in the strength of mandrels, comprising:

[0076] S1: Calculate the depth of the quench hardened layer required by the mandrel according to the design strength. This embodiment adopts the design method of the quench hardened layer depth that meets the strength requirements. The specific method is as follows:

[0077] S11: Measure the outer diameter of each section of the mandrel with a screw micrometer, and determine the minimum outer diameter...

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Abstract

The invention relates to a production, calculation, heating and verification method for reducing the strength difference of a mandrel. The production, calculation, heating and verification method comprises the steps that the depth of a quenching hardening layer needed by the mandrel is calculated according to the design strength; and calculating the output power of the induction heating equipment, calibrating the curve interval W instantaneous (t) of the instantaneous power value when the depth of the quenching hardening layer of the workpiece meets the required depth, carrying out induction heating on the workpiece by utilizing the induction heating equipment, controlling the instantaneous power to be in the curve interval W instantaneous (t), and detecting whether the instantaneous power is in the curve interval W instantaneous (t) or not so as to judge whether the workpiece is qualified or not. And S4, checking the depth of a quenching hardening layer of the workpiece. The device has the effects that the workpieces are fully inspected, and the strength difference between the workpieces in the same batch is reduced.

Description

technical field [0001] The present application relates to the field of mandrel processing technology, in particular to a production, calculation, heating and verification method for reducing the strength difference of mandrels. Background technique [0002] There is a type of transmission mechanism in the automobile chassis transmission system called constant velocity universal joint transmission shaft. As part of the power transmission of the car body, one end of the constant velocity universal joint transmission shaft is connected to the differential, and the other end is connected to the wheel hub. A CVJ driveshaft usually consists of two universal joints and a mandrel. Among them, the mandrel is the component that mainly carries the torque, so there is a higher requirement for its strength. [0003] Surface quenching of shaft workpieces is a common process to increase their strength. When checking whether the strength of the workpiece meets the requirements after quench...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/55C21D1/10C21D9/28C21D1/18C21D11/00
CPCC21D1/55C21D1/10C21D9/28C21D1/18C21D11/00Y02P10/25
Inventor 王立军钟芳平石明全熊浩泽余成祥乔继禹
Owner ZHEJIANG ODM TRANSMISSION TECH
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