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Large thin-wall revolving body type steel casting heat treatment fixture and application method thereof

A technology for revolving body and steel castings, applied in the field of heat treatment tooling for large-scale thin-walled revolving body steel castings, can solve the problems of affecting machinability, oxygen cutting scars, and increasing casting costs, reducing post-processing work, The effect of reducing size and weight and preventing deformation due to heat treatment

Active Publication Date: 2015-01-21
KOCEL STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is more effective to prevent the deformation of castings by increasing subsidies, but it increases the consumption of molten steel, so that the shape and size of castings are quite different from the drawings. After the castings are cast, the subsidies must be removed, which increases the workload of cleaning the castings accordingly It also increases the amount of machining and increases the cost of castings
At the same time, the subsidized part will produce a serious oxygen cutting scar, which seriously affects the appearance quality of the casting, and the cutting part needs gouging, resulting in increased hardness and affecting the machining performance

Method used

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  • Large thin-wall revolving body type steel casting heat treatment fixture and application method thereof
  • Large thin-wall revolving body type steel casting heat treatment fixture and application method thereof

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Effect test

Embodiment 1

[0022] Such as figure 1 with figure 2 Shown is the heat treatment tooling for large-scale thin-walled steel castings of the revolving body of the present invention. It includes two or more layers of radial braces 2 arranged in the revolving body 1 to support the inner wall of the revolving body 1. The radial brace 2 intersects and is fixed at the center of rotation of the slewing body 1. A vertical support rod 3 is provided between the intersection points of adjacent upper and lower radial braces 2 and below the intersection point of the lowermost radial brace 2. The tie bars 2 and the inner wall of the revolving body 1 are fixed by spot welding, and the radial tie bars 2 are welded and fixed at the intersection of the center of the revolving body 1.

[0023] In order to further realize the balanced support of the casting of the revolving body up and down and in the radial direction, the radial braces 2 of the upper and lower adjacent layers are staggered along the radial angle ...

Embodiment 2

[0030] The above-mentioned large-scale thin-walled steel casting heat treatment tool is used to prevent the heat treatment deformation of the casting. The large thin-walled steel casting in this method has a diameter of 4 meters, a height of 1 meter, and a wall thickness of 40 mm. The technical method performs heat treatment with a large amount of deformation and a large amount of work for the subsequent shaping treatment. The method of the present invention adopts the following steps to set the support tool inside the rotating body before performing the heat treatment:

[0031] 1) In this embodiment, the radial brace 1 is provided with two upper and lower layers, the angle between adjacent radial braces in each layer is 90°, and the upper and lower radial braces are staggered at 45°. The vertical distance of the tendon is 0.4 meters, and the distance between the upper layer and the upper end and the lower layer and the lower end are both 0.3 meters;

[0032] (2) Select the corresp...

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Abstract

The invention relates to the technical field of steel casting heat treatment, and in particular relates to a large thin-wall revolving body type steel casting heat treatment fixture and an application method thereof. The large thin-wall revolving body type steel casting heat treatment fixture comprises two or more than two layers of a plurality of radial pull ribs which are arranged in a revolving body for supporting the inner wall of the revolving body, the radial pull ribs of each layer are crossed and fixed in the revolving center of the revolving body, perpendicular supporting rods are arranged between adjacent cross points of the upper and lower radial pull ribs and below the cross points of the radial pull ribs on the lowermost layer, the radial pull ribs are fixed with the inner wall of the revolving body in a spot welding mode, and the radial pull ribs are fixed at an intersection part in the center of the revolving body in a welding mode. By adopting the heat treatment fixture and the application method disclosed by the invention, the deformation quantity of thin-wall castings in heat treatment can be reduced, working procedures of the castings after heat treatment can be simplified, the production efficiency of the castings can be improved, and the production cycle can be shortened.

Description

Technical field [0001] The invention relates to the technical field of heat treatment of steel castings, in particular to a heat treatment tool for large-scale thin-walled revolving steel castings and a use method thereof. Background technique [0002] During the heat treatment of large-scale thin-walled rotary steel castings, due to heat treatment stress (thermal stress and structural stress), uneven structure, phase transformation, etc., it is easy to cause casting deformation. In addition, the improper support of the casting during heating and cooling in the heat treatment furnace and the weight of the casting itself can cause casting deformation. This kind of deformation will cause a shortage of parts of the casting, and repair welding will cost a lot of costs; corrections for deformation will also consume a certain amount of manpower and material resources, and will seriously affect the production cycle of the casting. [0003] In response to this shortcoming, the traditional...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/00
CPCC21D9/0068
Inventor 李少雨罗永建唐钟雪冯周荣闫新飞何启良田成刚程勤
Owner KOCEL STEEL
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