CN-122007211-A - TA15 titanium alloy pointer reverse double-angle one-step forming die capable of reducing rebound and forming method

Abstract

The invention discloses a reverse double-angle one-step forming die for a TA15 titanium alloy pointer with reduced rebound and a forming method, wherein the die comprises an upper die, a lower die and a lower die fixing sleeve; the lower die fixing sleeve is provided with an inner cavity which is consistent with the outline of the pointer blank and is used for accommodating and circumferentially limiting the blank, the lower die is arranged in the cavity and axially limited by the worktable, the shape of the upper die is matched with the cavity, and the upper die enters the cavity to be matched with the lower die under the driving of the hydraulic press, so that the die is formed by one-step stamping. The method comprises the steps of heating a blank to 850 ℃ plus or minus 20 ℃ and preserving heat, transferring the blank into a lower die fixing sleeve for quick positioning, punching the upper die at a speed of 5-10mm/s, maintaining the pressure for at least 10 seconds at a pressure of 4 tons after the upper die is in place, and finally demoulding and taking out pieces. The invention realizes one-time precise forming of reverse double angles, effectively avoids cracking and inhibits rebound, and remarkably improves the forming precision and the production efficiency of products.

Inventors

• ZHAO YANWEI
• YI GUOJIE
• MA JIANGHONG
• ZHANG HONG
• LIU LANG
• HU JUNLIN
• XIE JIN
• CHEN YI
• TANG LIN
• ZHOU XIAO
• YAN QIAO
• Ai Junnan
• MA YINGZHONG

Assignees

• 贵州航天精工制造有限公司

Dates

Publication Date

20260512

Application Date

20260310

Claims (10)

1. 1. A reverse double-angle one-time forming die for a TA15 titanium alloy pointer with reduced rebound is characterized by comprising an upper die (1), a lower die (2) and a lower die fixing sleeve (3); The lower die fixing sleeve (3) is a hollow structure body with an inner cavity (31), the inner cavity (31) is opened up and down, the section shape of the inner cavity (31) is consistent with the plane contour of the pointer blank (4 a) to be processed, and the lower die fixing sleeve is used for accommodating and circumferentially limiting the pointer blank (4 a); The lower die (2) is arranged in an inner cavity (31) of the lower die fixing sleeve (3), and axial limit is realized by a hydraulic press workbench surface below the bottom of the lower die fixing sleeve (3); The upper die (1) is located above the lower die fixing sleeve (3), the shape of the upper die is matched with the inner cavity (31) of the lower die fixing sleeve (3), the upper die is used for entering the lower die fixing sleeve (3) under the driving of a hydraulic press and is in combined action with the lower die (2), and the heated pointer blank (4 a) is subjected to one-time stamping forming.
2. 2. The reverse double-angle one-time forming die for the TA15 titanium alloy pointer with reduced rebound according to claim 1 is characterized in that two side walls of the lower die fixing sleeve (3) are used as appearance positioning references of pointer blanks.
3. 3. The reverse double-angle one-time forming die for reducing rebound TA15 titanium alloy pointers according to claim 1, wherein a semi-closed opening (32) communicated with an internal cavity (31) is formed at the top of the side wall of the lower die fixing sleeve (3), and one corner of the top of the lower die (2) is positioned in the semi-closed opening (32).
4. 4. The reverse double-angle one-time forming die for the TA15 titanium alloy pointer with rebound reduction according to claim 1, wherein the size of an inner cavity of the lower die fixing sleeve (3) is larger than the plane contour of the pointer blank (4 a).
5. 5. A reverse double angle one shot forming method of a TA15 titanium alloy pointer with reduced spring back using a die as claimed in any one of claims 1 to 4, comprising the steps of: Firstly, pre-treating a blank, namely heating a TA15 titanium alloy pointer blank to 850 ℃ plus or minus 20 ℃ and preserving heat for at least 5 minutes; Step two, bending, namely placing the pretreated blank into the lower die fixing sleeve (3), driving the upper die (1) to punch downwards, and maintaining the pressure for at least 10 seconds by using the pressure of 4 tons after reaching the end point; And step three, demolding and taking out the part, namely, lifting the upper die (1), and taking out the formed pointer workpiece (4 b) from the lower die fixing sleeve (3).
6. 6. The reverse double-angle primary forming method for the TA15 titanium alloy pointer with rebound reduction according to claim 5, wherein in the second step, when a blank is placed into the lower die fixing sleeve (3), a visual alignment or mechanical guiding mode is adopted to enable the edge of the blank to be in contact with two side walls of the lower die fixing sleeve (3) so as to realize primary positioning.
7. 7. The reverse double-angle primary forming method for the TA15 titanium alloy pointer with reduced rebound according to claim 5, wherein in the second step, the transfer time from the taking out of the blank from the heating equipment to the putting in of the lower die fixing sleeve (3) is controlled within 10 seconds.
8. 8. The reverse double-angle primary forming method for reducing rebound of the TA15 titanium alloy pointer according to claim 5, further comprising the step of adjusting parameters of a hydraulic press before the second step, wherein the pressing speed of the upper die (1) is controlled within the range of 5mm/s-10 mm/s.
9. 9. The method for forming the TA15 titanium alloy pointer back double angles with reduced rebound according to claim 5, wherein in the second step, after the upper die (1) and the lower die (2) are clamped, circumferential limit is performed on the pointer blank (4 a) through the lower die fixing sleeve (3), and extrusion forming in the thickness direction is performed on the pointer blank (4 a) through the upper die (1) and the lower die (2).
10. 10. The reverse double-angle one-time forming method for the TA15 titanium alloy pointer with reduced rebound according to claim 5, wherein in the third step, tweezers are used for clamping the formed pointer workpiece (4 b) from a semi-closed opening (32) of the lower die fixing sleeve (3).

Description

TA15 titanium alloy pointer reverse double-angle one-step forming die capable of reducing rebound and forming method Technical Field The invention relates to the technical field of precision stamping forming, in particular to a reverse double-angle one-step forming die and a reverse double-angle one-step forming method for a TA15 titanium alloy pointer with reduced rebound. Background Along with the increasing requirements of the aerospace field on the light weight and high temperature performance of the components, the TA15 titanium alloy is widely used for manufacturing key structural components in aeroengines and spacecrafts due to the excellent specific strength, corrosion resistance and high temperature comprehensive mechanical properties. The pointer is used as a typical reverse double-angle bent structural member, and the forming precision of the pointer directly influences the subsequent assembly quality and the service performance. At present, for manufacturing a TA15 titanium alloy pointer with a reverse double-angle structure, two step forming processes are generally adopted in the industry, namely, bending in one direction is finished firstly, and then reverse bending is finished through secondary clamping. However, this conventional process has the following significant drawbacks: (1) The TA15 titanium alloy is bent at room temperature, and when the bending angle is close to 160 degrees, the bending position is extremely easy to have obvious crack defects, so that the part is scrapped. (2) The positioning precision is low, in the twice step forming process of the traditional process, positioning errors are necessarily introduced into the twice clamping process, and the errors are accumulated and overlapped, so that the angle and the size of the final product are difficult to meet the strict precision assembly requirements in the aerospace field. (3) The production efficiency is low, namely the single-piece production period is long due to the two step forming procedures, and the production efficiency is low. (4) The rebound suppression is difficult, the rebound is obvious after the TA15 titanium alloy is formed at high temperature, the existing die and the forming method lack of a specific rebound compensation design, and the forming precision is further reduced. (5) The technical scheme is that a special one-time forming die and a matched process method aiming at a TA15 titanium alloy reverse double-angle pointer are not available in the industry at present, and a comprehensive technical scheme capable of effectively inhibiting rebound and improving processing efficiency is also lacking. Therefore, developing a special mold and a forming method capable of realizing one-step forming, effectively reducing rebound, and improving positioning accuracy and production efficiency has become a technical problem to be solved in the art. Disclosure of Invention In order to solve the problems, the invention aims to provide a reverse double-angle one-step forming die and a forming method for a TA15 titanium alloy pointer, which can reduce rebound. The aim of the invention is achieved by the following technical scheme: A reverse double-angle one-time forming die for a TA15 titanium alloy pointer with rebound reduction comprises an upper die, a lower die and a lower die fixing sleeve, wherein the lower die fixing sleeve is a hollow structure body with an inner cavity, the upper and lower openings of the inner cavity are formed, the cross section shape of the inner cavity is consistent with the plane contour of a pointer blank to be processed and is used for accommodating and circumferentially limiting the pointer blank, the lower die is arranged in the inner cavity of the lower die fixing sleeve and axially limited by a hydraulic press workbench surface below the bottom of the lower die fixing sleeve, the upper die is located above the lower die fixing sleeve, the shape of the upper die is matched with the inner cavity of the lower die fixing sleeve, and the upper die is used for entering the lower die fixing sleeve under the driving of a hydraulic press and is jointly acted with the lower die to perform one-time stamping forming on the heated pointer blank. Furthermore, two side walls of the lower die fixing sleeve are used as appearance positioning references of pointer blanks. Further, a semi-closed opening (used for taking out the formed pointer workpiece) communicated with the cavity inside the lower die is arranged at the top of the side wall of the lower die fixing sleeve, and one corner of the top of the lower die is positioned in the semi-closed opening. Further, the size of the inner cavity of the lower die fixing sleeve is larger than the plane outline of the pointer blank. A reverse double-angle one-step forming method for a TA15 titanium alloy pointer with reduced rebound, which uses the die, comprises the following steps: step one, blank pretreatment, namely heating the TA15 titanium alloy poin