CN111940654A - Method for improving and stabilizing flaw detection level of TC6 titanium alloy cake blank - Google Patents
Method for improving and stabilizing flaw detection level of TC6 titanium alloy cake blank Download PDFInfo
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- CN111940654A CN111940654A CN202010807150.9A CN202010807150A CN111940654A CN 111940654 A CN111940654 A CN 111940654A CN 202010807150 A CN202010807150 A CN 202010807150A CN 111940654 A CN111940654 A CN 111940654A
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- blank
- upsetting
- cake
- bar
- cake blank
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J13/00—Details of machines for forging, pressing, or hammering
- B21J13/08—Accessories for handling work or tools
- B21J13/10—Manipulators
- B21J13/12—Turning means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
- B21J5/08—Upsetting
Abstract
The invention provides a method for improving and stabilizing the flaw detection level of a TC6 titanium alloy cake blank, which comprises the following steps: upsetting: heating the bar stock to a temperature lower than the phase change point, upsetting the bar stock, turning the bar stock for 180 degrees after each upsetting, and upsetting the bar stock for multiple times to obtain a cake blank; drawing out: drawing the cake blank for multiple times to obtain a regular polygonal prism blank after each drawing, wherein the edges of the blank obtained after any two adjacent times of drawing are different, the positions of the edges of the blank obtained after two adjacent times of drawing are different, and the length of the blank after the last time of drawing is equal to that of the bar blank raw material; and repeatedly upsetting and drawing out to obtain a cake blank finished product after final upsetting. The invention can obviously improve the internal quality of the cake blank, ensures that the quality of each part of the cake blank is uniform, reduces the quality uncertainty caused by upsetting and drawing, can improve the ultrasonic flaw detection level and the qualification rate of the cake blank, reduces the production cost, and can be used for industrialized and batch production.
Description
Technical Field
The invention relates to the technical field of TC6 titanium alloy cake blank forging, in particular to a method for improving and stabilizing the flaw detection level of a TC6 titanium alloy cake blank.
Background
The TC6 titanium alloy is equivalent to Russian BT3-1, is a Chinese product of extensive Russian titanium alloy, and is widely applied to engines of certain models in China. The technical standard of a certain type of forge piece has high requirement on ultrasonic detection of a product, the technical standard of a corresponding bar has low requirement on ultrasonic detection of raw materials, an intermediate cake blank with high ultrasonic flaw detection level and stability is required to serve as a bridge, a TC6 titanium alloy cake blank is obtained by repeatedly upsetting and drawing a TC6 titanium alloy bar, the quality of the intermediate cake blank obtained by the conventional upsetting and drawing process cannot meet die forging requirements, the quality is unstable, particularly the fluctuation range of the ultrasonic noise value of the cake blank is large, and great potential quality risk is caused to the forge piece.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for improving and stabilizing the flaw detection level of the TC6 titanium alloy cake blank, increasing the quality and the flaw detection stability of the TC6 titanium alloy cake blank and being beneficial to realizing batch processing.
The technical scheme adopted by the invention for solving the technical problems is as follows: the method for improving and stabilizing the flaw detection level of the TC6 titanium alloy cake blank comprises the following steps:
upsetting: heating the bar stock to a temperature lower than the phase change point, upsetting the bar stock, turning the bar stock for 180 degrees after each upsetting, and upsetting the bar stock for multiple times to obtain a cake blank;
drawing out: drawing the cake blank for multiple times to obtain a regular polygonal prism blank after each drawing, wherein the edges of the blank obtained after any two adjacent times of drawing are different, the positions of the edges of the blank obtained after two adjacent times of drawing are different, and the length of the blank after the last time of drawing is equal to that of the bar blank raw material;
and repeatedly upsetting and drawing out to obtain a cake blank finished product after final upsetting.
Further, the drawing process is as follows:
A. drawing out the cake blank into a regular quadrangular prism;
B. drawing out a regular quadrangular prism into a regular octagonal prism;
C. repeating the steps A and B for several times.
Further, during upsetting, the temperature of the bar blank is 30-40 ℃ lower than the phase transition point, and the temperature of the bar stock of the former fire is higher than or equal to that of the bar stock of the latter fire.
Further, each hot upset resulted in a biscuit thickness of 50% to 60% of the bar length.
Furthermore, the compression amount of the upsetting blank in each pass is 100-150 mm.
The invention has the beneficial effects that: during upsetting, the blank is turned over by 180 degrees after each upsetting, so that the deformation uniformity of each part of the blank can be effectively regulated and controlled, and the roundness of the cake blank is higher in appearance; when the cake blank is drawn, the regular polygon prism with different prism numbers is obtained in each pass, so that the edges can be prevented from being cooled more, the temperature difference between the edges and other parts is reduced, the uniform temperature of each part of the cake blank is ensured, and the uniform degree of the tissue of each part is further ensured.
Detailed Description
The present invention will be further described with reference to the following examples.
The invention discloses a method for improving and stabilizing the flaw detection level of a TC6 titanium alloy cake blank, which comprises the following steps of:
upsetting: heating the bar stock to a temperature lower than the phase change point, upsetting the bar stock, turning the bar stock for 180 degrees after each upsetting, and upsetting the bar stock for multiple times to obtain a cake blank.
The phase change point is the inherent attribute of the bar billet raw material, is closely related to alloy components, generally has two testing means of a calculation method and a metallographic method, and has the advantages of crucial accuracy, closer heating temperature of the billet to the phase change point, and unfavorable upsetting and pulling of the bar when the difference between the tested phase change point and the real phase change point of the bar is larger. The heating temperature of the blank is determined according to the phase change point, if the measured phase change point is higher than the true value of the phase change point, the heating temperature of the blank is possibly too high and even higher than the phase change point, and the overheating risk exists in the deformation process; if the measured phase change point is below the true value of the phase change point, the heating temperature of the blank may be too low and the blank risks deformation cracking. Therefore, the phase change points must be accurately detected, the phase change points need to be detected at the head and the tail of the bar, the phase change point detection values cannot be too large, and the phase change points are retested when the phase change point detection values are too large until the real and accurate TC6 titanium alloy bar phase change points are obtained.
Besides measuring the phase change point, the deformation of the blank and the compression of each pass need to be determined, wherein the deformation is (the original bar length-the target value of the pressing-down)/the original bar length, and after a plurality of tests, the deformation is found to be the best of 50% to 60%, namely the thickness of the cake blank obtained by upsetting is 50% to 60% of the bar length, and the compression of the upset blank of each pass is 100 mm to 150 mm.
During upsetting, the compression amount of each pass of the blank cannot be completely consistent, and deformation unevenness can be caused, so that the blank is turned for 180 degrees after upsetting of each pass and then upset for the next pass, the deformation uniformity of each part of the blank can be effectively regulated and controlled, the tissue quality of each part of a cake blank is stable and balanced, and the cake blank has higher roundness in the appearance.
Drawing out: and (3) carrying out multi-pass drawing on the cake blank to obtain a regular polygonal blank after each time of drawing, wherein the edges of the blank obtained after any two adjacent passes of drawing are different, the positions of the edges of the blank obtained after two adjacent passes of drawing are different, and the length of the blank obtained after the last pass of drawing is equal to that of the bar blank raw material.
At present, the conventional elongation method is as follows: the method comprises the following steps of directly drawing a cake blank into a square prism blank, chamfering the blank into a square prism, and often causing unqualified ultrasonic flaw detection of the finished cake blank and poor tissue uniformity inside the cake blank.
Therefore, each fire drawing is divided into a plurality of passes, the blank is formed into regular polygon prisms with different shapes in each pass, and the positions of the edges of the blank obtained after two adjacent passes of drawing are different, so that the edge drawn in the previous pass enters the blank in the next pass, the existence time of each edge is reduced, the heat dissipation capacity of each edge is reduced, the temperature difference between the edge and other parts is reduced, the probability of uneven tissue is greatly reduced after the material at the edge is mixed with the blank at other parts, the uniformity and consistency of the material quality of each part are improved, the internal quality of a finished cake blank is ensured, the ultrasonic flaw detection level is improved, and the qualification rate of the cake blank is increased.
Specifically, the blank may be a regular quadrangular prism, a regular hexagonal prism, a regular octagonal prism, or the like after being drawn out for each pass, and as long as the number of blank edges obtained by drawing out for each pass is different, the preferred embodiment is as follows:
A. drawing out the cake blank into a regular quadrangular prism;
B. drawing out a regular quadrangular prism into a regular octagonal prism;
C. repeating the steps A and B for several times.
The drawing mode can ensure the quality of the blank.
And repeating the upsetting and the drawing to finally obtain a cake blank finished product after upsetting.
During the first upsetting, after the phase transformation point is measured, the heating temperature of the blank can be determined according to the phase transformation point, the blank is easier to deform when the temperature of the blank is higher, the upsetting difficulty is lower, but the blank is prevented from being overheated, so that the temperature of the bar blank is 30-40 ℃ lower than the phase transformation point during the upsetting, the temperature of the bar blank of the former fire is higher than or equal to that of the bar blank of the latter fire, the structure can be broken, nucleation particles are increased, and the grains are refined.
After the method is adopted, the internal quality of the cake blank can be obviously improved, the quality of each part of the cake blank is uniform, the quality uncertainty caused by upsetting and pulling is reduced, the ultrasonic flaw detection level and the qualification rate of the cake blank can be improved, the production cost is reduced, and the method can be used for industrial and batch production.
Example one
The invention is further explained by taking an example of a TC6 cake blank used for die forging of a certain type of low-pressure III-grade disc forging.
The specification of the bar material is
The thickness of the target cake blank is 350mm, the phase change point is 978 ℃ when measured, and the ultrasonic flaw detection result of the contact method is
The technical requirement is that the ultrasonic flaw detection level of the forge piece is not more than phi 0.8-9 dB.
Upsetting: heating the blank to 938-948 ℃, upsetting the blank for 3 times, wherein the compression amount of the blank in each time is 140 +/-10 mm, turning the blank for 180 degrees after upsetting in each time, and upsetting for multiple times to obtain a cake blank;
drawing out: drawing out the cake blank into a regular quadrangular prism, and drawing out the regular quadrangular prism into a regular octagonal prism; the above elongation process was repeated to obtain a blank having a length of 780 mm.
Repeating the upsetting and the drawing out for 8 h, and then upsetting at the 9 th fire to obtain a finished cake blank.
And (4) roughly processing the upper end face and the lower end face of the finished cake blank by using a machine tool, so that the roughness of the upper end face and the lower end face of the cake blank meets the requirement of water immersion ultrasonic detection.
Water immersion ultrasonic testing was performed on the upper end (UTA) and lower end (UTB) of the cake blank, and the test results obtained are shown in the following table:
according to the detection result, the water immersion ultrasonic flaw detection result of the TC6 titanium alloy cake blank prepared by the method meets the technical standard requirement, and the ultrasonic detection noise of the upper end surface and the lower end surface of the cake blank is stably positioned
Ultrasonic detection noise required to meet acceptance criteria
By adopting the embodiment to process and detect multiple batches of cake blanks, the qualification rate is 100%, and in the qualified cake blanks, the ultrasonic flaw detection result is in
The content in the range is 20%. Therefore, compared with the current situation that the ultrasonic flaw detection index of the TC6 cake blank exceeds the standard at present, the method can improve and stabilize the flaw detection level of the TC6 titanium alloy cake blank under the same condition.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. The method for improving and stabilizing the flaw detection level of the TC6 titanium alloy cake blank is characterized by comprising the following steps of:
upsetting: heating the bar stock to a temperature lower than the phase change point, upsetting the bar stock, turning the bar stock for 180 degrees after each upsetting, and upsetting the bar stock for multiple times to obtain a cake blank;
drawing out: drawing the cake blank for multiple times to obtain a regular polygonal prism blank after each drawing, wherein the edges of the blank obtained after any two adjacent times of drawing are different, the positions of the edges of the blank obtained after two adjacent times of drawing are different, and the length of the blank after the last time of drawing is equal to that of the bar blank raw material;
and repeatedly upsetting and drawing out to obtain a cake blank finished product after final upsetting.
2. The method for improving and stabilizing the flaw detection level of the TC6 titanium alloy cake blank according to claim 1, wherein the drawing process comprises the following steps:
A. drawing out the cake blank into a regular quadrangular prism;
B. drawing out a regular quadrangular prism into a regular octagonal prism;
C. repeating the steps A and B for several times.
3. The method for improving and stabilizing the flaw detection level of the TC6 titanium alloy cake blank according to claim 1, wherein the temperature of the bar blank is 30-40 ℃ lower than the transformation point when upsetting, and the temperature of the bar blank of the former fire is higher than or equal to the temperature of the bar blank of the latter fire.
4. The method for improving and stabilizing the flaw detection level of the TC6 titanium alloy billet according to claim 1, wherein each upset forging produces a billet thickness of 50 to 60 percent of the length of the bar.
5. The method for improving and stabilizing the flaw detection level of the TC6 titanium alloy cake blank according to claim 1, wherein the reduction amount of the upset blank in each pass is 100-150 mm.
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| CN202010807150.9A CN111940654A (en) | 2020-08-12 | 2020-08-12 | Method for improving and stabilizing flaw detection level of TC6 titanium alloy cake blank |
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| CN202010807150.9A CN111940654A (en) | 2020-08-12 | 2020-08-12 | Method for improving and stabilizing flaw detection level of TC6 titanium alloy cake blank |
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Application publication date: 20201117 |