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Forging technology of high-strength TC4 titanium alloy column part

A titanium alloy, high-strength technology, applied in the field of titanium alloy forging technology, can solve the problems of the titanium alloy cylindrical forgings producing Widmanstler structure, not meeting product service conditions, improper heating temperature control, etc., to achieve reasonable forging process route, change Morphological characteristics of Widmandelstein microstructure and the effect of reducing temperature gradient

Active Publication Date: 2019-05-10
天津航天长征技术装备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the raw material is a Widmanstatten structure, due to insufficient forging deformation and improper control of the heating temperature before forging, it is very easy to cause the titanium alloy cylindrical forging to produce a Widmanstatten structure, which does not meet the service conditions of the product, resulting in the scrapping of the workpiece and causing certain losses.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] A high-strength TC 4 The forging process of titanium alloy column parts, the specific steps are as follows:

[0072] Step 1, blanking:

[0073] Carry out size design for the blanking bar, the part size is Φ125×Φ70×240mm, and the raw material is TC 4 Titanium alloy extruded rods, blanked to get the original rods;

[0074] Step 2, car blank:

[0075] Carry out turning processing on the outer circular surface of the original bar obtained in step 1, and process R10 chamfers on the end face of the original bar, and the end face is not allowed to have a center hole, so as to obtain a rough bar;

[0076] Step 3, heating before forging:

[0077] Use an electric furnace to heat the blank bar produced in step 2, put the blank bar in the furnace at room temperature and raise the temperature to 950°C with the furnace;

[0078] Step 4, tool and mold preheating:

[0079] Preheat the upper and lower hammer anvils so that the surface temperature of the anvil surfaces reaches 250°...

Embodiment 2

[0099] A high-strength TC 4 The forging process of titanium alloy column parts, the specific steps are as follows:

[0100] Step 1, blanking:

[0101] Carry out size design for the blanking bar, the part size is Φ125×Φ70×240mm, and the raw material is TC 4 Titanium alloy extruded rods, blanked to get the original rods;

[0102] Step 2, car blank:

[0103] Carry out turning processing on the outer circular surface of the original bar obtained in step 1, and process R10 chamfers on the end face of the original bar, and the end face is not allowed to have a center hole, so as to obtain a blank bar;

[0104] Step 3, heating before forging:

[0105] Heating the blank bar obtained in step 2 with an electric furnace, putting the blank bar into the furnace at room temperature and raising the temperature to 970°C with the furnace;

[0106] Step 4, tool and mold preheating:

[0107] Preheat the upper and lower hammer anvils to make the surface temperature of the anvil surface reac...

Embodiment 3

[0127] A high-strength TC 4 The forging process of titanium alloy column parts, the specific steps are as follows:

[0128] Step 1, cutting:

[0129] Carry out size design for the blanking bar, the part size is Φ125×Φ70×240mm, and the raw material is TC 4 Titanium alloy extruded rods, blanked to get the original rods;

[0130] Step 2, car blank:

[0131] Carry out turning processing on the outer circular surface of the original bar obtained in step 1, and process R10 chamfers on the end face of the original bar, and the end face is not allowed to have a center hole, so as to obtain a blank bar;

[0132] Step 3, heating before forging:

[0133] Use an electric furnace to heat the blank bar produced in step 2, put the blank bar in the furnace at room temperature and raise the temperature to 960°C with the furnace;

[0134] Step 4, tool and mold preheating:

[0135] Preheat the upper and lower hammer anvils so that the surface temperature of the anvil surfaces reaches 260°C...

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Abstract

The invention provides a forging technology of a high-strength TC4 titanium alloy column part. The forging technology comprises the specific steps of material feeding, blank turning, heating before forging, tool and die preheating, first time of upsetting, drawing, second time of upsetting, thermal treatment and quality inspection. According to the forging technology, because of the transformationprocess of upsetting, drawing and upsetting, the deformation in the forging process is increased, and the forging process route is reasonable. According to the forging technology, during the processof drawing, because the section of a blank bar is set to be a hexagon, or heptagon or octagon, no over protruding edges are formed in corners, the temperature gradient between different positions on the surface of the blank bar is decreased, deformation is more uniform when load is applied, and the surface quality of a forge piece is better. According to the forging technology of the high-strengthTC4 titanium alloy column part, in the process of the second time of upsetting, both the hammer drop speed and hammer drop force are larger than those of the first time of upsetting; before the second time of upsetting, the temperature of the blank bar is low, at this time, large axial deformation ranging from 30% to 50% is applied to the blank, a long-strip shaped alpha phase can be promoted tobe broken, and the shape characteristics of a Widmannstatten structure is effectively changed.

Description

technical field [0001] The invention relates to the technical field of titanium alloy forging technology, in particular to a high-strength TC 4 Forging process of titanium alloy column. Background technique [0002] In the development process of a new generation of launch vehicles, the requirements of light weight, integration and reliability put forward higher requirements for material selection and manufacturing technology. Titanium alloy has the characteristics of high specific strength and good corrosion resistance. Its application can effectively improve the bearing capacity and achieve the purpose of weight reduction. It is the preferred material for structural parts with light structure and harsh service conditions. Titanium alloy has the characteristics of narrow deformation temperature range, high deformation resistance, and extremely fast cooling speed in the corner area, so it is difficult to forge titanium alloy. [0003] The microstructure of titanium alloy is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C37/04C22F1/18
Inventor 姚梦张文学倪江涛付敏敏张曼曼刘浩高建新马少义李彦忠崔岩旭刘海成常永甫汤君杰宫成
Owner 天津航天长征技术装备有限公司
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