CN104342539A

CN104342539A - Bearing bush white point eliminating process

Info

Publication number: CN104342539A
Application number: CN201310340175.2A
Authority: CN
Inventors: 孙常奋; 邹德芳
Original assignee: SHANGHAI HUDONG FORGING PLANT CO Ltd
Current assignee: SHANGHAI HUDONG FORGING PLANT CO Ltd
Priority date: 2013-08-07
Filing date: 2013-08-07
Publication date: 2015-02-11

Abstract

The invention discloses a bearing bush white point eliminating process, and relates to the technical field of steel forging processes. The eliminating process comprises the following steps: (A) a product (2) is heated to 1280 DEG C by high temperature, and is little deformed at local part; (B) the product (2) is put between an upper anvil block (1) and a lower anvil block (3) for shrinking a hole; (C) the product (2) coats a core bar (4) at the upper end of a mandrel supporter (5); the upper part of the product (2) is the upper anvil block (1); the lower end of the mandrel supporter (5) is the lower anvil block (3); after the small-deformation broaching circling is performed, the annealing is performed in a heat treatment furnace; and (D) after the normal heat treatment and the machining are performed for the product (2), white points are eliminated through the ultrasonic flaw detection. When large free forgings have the white points, and the material hydrogen content is below 2 PPM, the process can eliminate the white points to improve the product quality and reduce the quality loss.

Description

Bearing housing white point eliminates technique

Technical field

The present invention relates to steel forging process technical field, be specifically related to a kind of open die forgings bearing housing white point and eliminate technique.

Background technology

White point is the crackle formed under the effect of hydrogen stress after forging in steel, and white point is injurous defect to product.After product finds white point, the product that same hearth number starting material are produced scraps process.Along with China smelts the raising of level, hydrogen richness smelted by steel all can reach 2PPM once at present, but when cooling after forged inappropriate technology, still can produce white point, and especially high to the white point proneness such as carbon manganese steel, steel alloy that carbon content is low steel, very easily occur white point.

Summary of the invention

The object of this invention is to provide a kind of bearing housing white point and eliminate technique, there is white point to large free forging part in it, material hydrogen richness, again when below 2PPM, can be eliminated white point, improve the quality of products, and reduces mass loss.

In order to solve the problem existing for background technology, the present invention is by the following technical solutions: its elimination technique is: A, to product 2 heat to 1280 DEG C, through local small deformation; B, product 2 is placed between upper anvil block 1 and lower anvil block 3 and carries out batter; C, to be set in by product 2 on the plug 4 of saddle support 5 upper end, and product 2 top is upper anvil block 1, saddle support 5 lower end is lower anvil block 3 again, carries out after small deformation reaming throws circle, entering heat treatment furnace annealing in time; D, product 2 UT (Ultrasonic Testing) after normal heat process, machining, white point is eliminated.

There is white point to large free forging part in the present invention, material hydrogen richness, again when below 2PPM, can be eliminated white point, improve the quality of products, and reduces mass loss.

Accompanying drawing illustrates:

Fig. 1 is the structural representation of batter of the present invention,

Fig. 2 is the structural representation that in the present invention, circle is thrown in small deformation reaming.

Embodiment:

This embodiment is by the following technical solutions: its elimination technique is: A, to product 2 heat to 1280 DEG C, through local small deformation; B, product 2 is placed between upper anvil block 1 and lower anvil block 3 and carries out batter (as Fig. 1); C, to be set in by product 2 on the plug 4 of saddle support 5 upper end, and product 2 top is upper anvil block 1, saddle support 5 lower end is that lower anvil block 3(is as Fig. 2 again), carry out after small deformation reaming throws circle, entering heat treatment furnace annealing in time; D, product 2 UT (Ultrasonic Testing) after normal heat process, machining, white point is eliminated.

There is white point to large free forging part in this embodiment, material hydrogen richness, again when below 2PPM, can be eliminated white point, improve the quality of products, and reduces mass loss.

Claims

1. bearing housing white point eliminates technique, it is characterized in that its elimination technique is: (A), to product (2) heat to 1280 DEG C, through local small deformation; (B), product (2) is placed between upper anvil block (1) and lower anvil block (3) and carries out batter; (C), again product (2) is set on the plug (4) of saddle support (5) upper end, and product (2) top is upper anvil block (1), saddle support (5) lower end is lower anvil block (3), after carrying out small deformation reaming throwing circle, enter heat treatment furnace annealing in time; (D), product (2) UT (Ultrasonic Testing) after normal heat process, machining, white point is eliminated.