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Pre-welding sectional type heating and press-fitting method and device

A segmented, press-fitting technology, applied in welding equipment, metal processing, laser welding equipment, etc., can solve the problems that the laser welding effect cannot be effectively guaranteed, the efficiency of piston processing is affected, and the oxide layer is prone to appear on the bonding surface. Achieve the effects of controllable press-fit interference, ensure press-fit quality, and shorten heating time

Pending Publication Date: 2021-01-15
武汉光谷航天三江激光产业技术研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the Chinese invention patent with application number 201810508873.1 discloses a steel piston preheating device and method. The outer ring of the piston is heated before the piston is pressed, and the piston is further heated after the press. The temperature of the rings is inconsistent. Although the inner ring and the outer ring can be press-fitted, due to the large temperature difference between the inner ring and the outer ring, an oxide layer is prone to appear on the bonding surface of the press-fitting, resulting in that the subsequent laser welding effect cannot be effectively guaranteed.
In addition, because the heating of the outer ring of the piston is from a temperature close to room temperature to 160-240°C before press-fitting, it takes a long time and has a serious impact on the overall processing efficiency of the piston. How to improve the heating efficiency is an important factor to improve the production of the piston.
Furthermore, in the press-fitting process, the existing methods can only judge whether the press-fitting is qualified or abnormal. Under abnormal conditions, the outer ring may be pressed into the inner ring in a skewed state, and the quality of the press-fitting cannot be guaranteed.

Method used

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  • Pre-welding sectional type heating and press-fitting method and device
  • Pre-welding sectional type heating and press-fitting method and device
  • Pre-welding sectional type heating and press-fitting method and device

Examples

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Effect test

Embodiment 1

[0056] Such as figure 1 As shown, a method of segmented heating and press-fitting before welding of the present invention is used for heating and press-fitting of the inner ring and outer ring interference fit of the steel piston of an automobile engine and includes the following steps:

[0057] S1. The inner ring and outer ring of the steel piston move to the induction heating station before press-fitting. There are multiple induction heating stations. Uniformity of temperature, reducing temperature difference;

[0058] S2. Move the heated inner ring and outer ring to the press-fitting station, and press-fit into a steel piston;

[0059] S3. The press-fitted steel piston is moved to the pre-heating station before welding, and the steel piston is heated as a whole to the temperature required for welding.

[0060] In step S1, the temperature difference between the inner ring and the outer ring after heating is less than or equal to 50°C, that is, the temperature of the outer ...

Embodiment 2

[0084] A method of segmented heating and press-fitting before welding of the present invention comprises the following steps:

[0085] S1. The inner ring and outer ring of the steel piston move to the induction heating station before press-fitting. There are multiple induction heating stations. The uniformity of temperature reduces the temperature difference; the inner ring and outer ring are heated to 290°C and 310°C respectively, and then the heat preservation state is automatically turned on until the induction heating ends before pressing;

[0086] S2. Move the heated inner ring and outer ring to the press-fitting station, and press-fit into a steel piston;

[0087] S3. The press-fitted steel piston is moved to the pre-welding preheating station, and the steel piston is heated as a whole to the temperature required for welding; and then the welding seam of the inner ring and the outer ring is laser welded.

[0088]During the heating process in step S1, the temperature of ...

Embodiment 3

[0111] The difference between this embodiment and embodiment 2 is:

[0112] The steel piston is welded directly after press-fitting, and the press-fitting process of step S2 is completed in 15 seconds. The temperature of the press-fitted steel piston is still 270°C, so laser welding can be performed directly, which reduces the heating process before press-fitting and reduces the overall Power consumption, simplifies the structure of the machined steel piston device.

[0113] All the other contents are identical with embodiment 2.

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Abstract

The invention discloses a pre-welding sectional type heating and press-fitting method and device which are are used for heating and press-fitting of interference fit of an inner ring and an outer ringof an automobile engine steel piston. The method comprise the following steps that S1, the inner ring and the outer ring of the steel piston are moved to induction heating stations before press-fitting, the number of the induction heating stations is multiple, gradient heating is synchronously carried out on the inner ring and the outer ring, the temperature uniformity of the inner ring and the outer ring is guaranteed, and the temperature difference is reduced; S2, the heated inner ring and the heated outer ring are moved to a press-fitting station, and a steel piston is formed through press-fitting; and S3, the steel piston formed through press-fitting is moved to a pre-welding preheating station, and the steel piston is integrally heated to the temperature needed by welding. The multiple induction heating stations are adopted, the pre-welding heating time (only 1 / 4 of the time needed by single-station induction heating) can be greatly shortened, the temperature difference (within + / -10 DEG C) of the inner ring and the outer ring is further reduced, the steel piston part achieves the more efficient heating process, and the overall machining efficiency of the steel piston is improved.

Description

technical field [0001] The invention belongs to the technical field of welding and forming of metal materials, in particular to a method and device for segmented heating and press-fitting before welding. Background technique [0002] As the heart of fuel vehicles, the engine is undoubtedly the most important part of the transformation and upgrading of the power system. In recent years, forged steel has become the most promising new material in piston manufacturing due to its high strength, small thermal expansion coefficient, high density, and low thermal conductivity. Compared with traditional aluminum pistons, steel pistons have the advantages of less emissions, lower production costs, stronger power, lower fuel consumption, and longer oil change intervals. The industry generally believes that the steel piston industry is the only way for the piston industry in the future, and will completely replace aluminum pistons in the next 3-5 years. [0003] Since the steel piston...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P11/02B23K26/21B23K26/70
CPCB23P11/02B23P11/025B23K26/21B23K26/702
Inventor 李方志王慧洋陈超何崇文万楚豪
Owner 武汉光谷航天三江激光产业技术研究院有限公司
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