CN119657720A

CN119657720A - Titanium alloy sheet rubber hot forming device and method

Info

Publication number: CN119657720A
Application number: CN202411464791.3A
Authority: CN
Inventors: 王辉; 王菲; 顾云; 李捷
Original assignee: Nanjing University of Aeronautics and Astronautics
Current assignee: Nanjing University of Aeronautics and Astronautics
Priority date: 2024-10-21
Filing date: 2024-10-21
Publication date: 2025-03-21

Abstract

The present invention discloses a rubber hot forming device and method for titanium alloy sheet. The device comprises a rubber frame, ordinary rubber, heat-resistant rubber, asbestos cloth, low-carbon steel plate, titanium plate to be processed, a mold, and a heated workbench. First, the mold is heated by a heating rod, so that the sheet is heated. When the thermocouple sensor on the mold measures that the mold reaches a specified temperature, a press pushes the rubber frame, and ordinary rubber fills the entire rubber frame, close to the heat-resistant rubber, and presses the asbestos cloth, low-carbon steel plate, and titanium plate to be processed in turn, until the titanium plate fits tightly with the mold, reducing the deformation resistance of the material and reducing the rebound, and finally completing the forming of the titanium alloy sheet.

Description

Device and method for rubber thermoforming of titanium alloy plate

Technical Field

The invention relates to the field of sheet metal part forming technology and dies, in particular to a rubber hot forming method of a titanium alloy plate.

Background

With the development of the aerospace field, the requirements on the aviation parts are also higher and higher, and the development of complexity, precision and light weight is continuously carried out. Rubber forming is an important plate forming process method, and can be used for effectively forming difficult-to-machine materials through uniform pressure distribution, so that parts with complex shapes can be manufactured, and the machined parts are guaranteed to have higher precision and good surface quality.

In order to reduce the weight and improve the performance of aircraft, the aerospace industry has largely adopted high strength, lightweight metallic materials, such as titanium alloys. However, at room temperature, titanium alloys have poor formability, which presents a challenge to manufacturing. The use of rubber forming processes to process the sheet also presents wrinkling, cracking and rebound problems. Particularly, due to the relatively low hardness of the rubber, the difficulty in forming high-strength materials such as titanium alloy is high, and the problem of limiting the further expansion of rubber forming application is also always caused.

Accordingly, the prior art has drawbacks and needs improvement.

Disclosure of Invention

The invention mainly aims at the defects of the prior art and provides a device and a method for rubber hot forming of a titanium alloy plate.

The main purpose of the invention is realized by the following scheme:

the utility model provides a titanium alloy sheet rubber hot forming device, includes the rubber appearance frame, is in the rubber appearance frame in proper order and is in the ordinary rubber that stacks together, heat-resistant rubber, asbestos cloth, low carbon steel sheet, wait to process the titanium board, but also includes forming die, heating table, the mould can be heated to the settlement temperature to utilize the mould heat transfer to wait to process the titanium board and heat the titanium board shaping area of waiting to process to the settlement temperature, asbestos cloth separate low carbon steel and heat-resistant rubber, the low carbon steel sheet when processing cover on waiting to process the titanium board completely.

The titanium alloy plate rubber hot forming device is characterized in that a titanium plate to be processed is arranged on a forming die, the forming die is fixed on a workbench through a counter bore, and a thermocouple sensor is arranged on the side wall of the forming die.

The heat-resistant rubber can bear high temperature of 290-300 ℃ and has unchanged flow property in the forming process.

The low-carbon steel plate has the thickness of 1mm, better flexibility than a titanium plate to be formed, better surface quality, and complete coverage on the titanium plate to be processed, separates asbestos cloth from the titanium plate, and prevents the asbestos cloth from leaving an indentation on the titanium plate in the processing process.

The titanium alloy plate rubber hot forming device is characterized in that the forming die is made of a material with high temperature resistance and good heat conduction performance, a thermocouple sensor is arranged on the side wall of the forming die, and the temperature of the die is monitored in real time.

The titanium alloy plate rubber hot forming device is characterized in that a heating rod is installed on a heatable workbench hole, a control wire is led out from the bottom, and the size of the workbench surface and a rubber containing frame form a matching size with a gap smaller than 5 mm.

According to the method for carrying out the rubber thermoforming of the titanium alloy plate by any device, a heating rod is firstly utilized to heat a forming die, when a thermocouple sensor detects that the forming die reaches a specified temperature, a press machine pushes a rubber containing frame, the whole rubber containing frame is fully filled with common rubber, heat-resistant rubber is tightly attached to the rubber, asbestos cloth, a low-carbon steel plate and a titanium plate to be processed are sequentially tightly pressed until the titanium plate to be processed is tightly attached to the die, and finally the forming of the titanium plate is completed.

By adopting the scheme, on one hand, the asbestos cloth is used for heat insulation to prevent the overheat flow performance of the heat-resistant rubber from changing, and on the other hand, the low-carbon steel plate is used for preventing the asbestos cloth from generating indentation on the formed part, so that the forming precision and the surface quality of the part are ensured from two aspects. The invention can carry out rubber forming on the titanium alloy plate at a high temperature state, reduces forming resistance, reduces rebound and improves plate forming quality.

Drawings

FIG. 1 is a schematic diagram of a titanium alloy sheet blanket thermoforming;

FIG. 2 is a schematic diagram of the hot forming operation of a titanium alloy sheet;

FIG. 3 is a diagram of a titanium alloy sheet material rubber molding object;

Detailed Description

The present invention will be described in detail with reference to specific examples.

As shown in fig. 1-2, the hot forming device for the titanium alloy plate rubber comprises a rubber containing frame, wherein common rubber 5, heat-resistant rubber 4, asbestos cloth 3, a low-carbon steel plate 2 and a titanium plate 1 to be processed which are stacked together are sequentially arranged in the rubber containing frame, the hot forming device further comprises a forming die 8 and a heatable workbench 9, the die 8 can be heated to a set temperature, and heat is transferred to the titanium plate to be processed by the die 8 to heat a titanium plate forming area to be processed to the set temperature. The common rubber occupies most of the volume of the rubber containing frame and is tightly attached to the heat-resistant rubber during processing, the heat-resistant rubber is used as a main forming medium, the inner wall of the rubber containing frame is matched with the outer wall of the heatable workbench 9 to form a gap smaller than 5mm, a sealing structure is formed during forming, the asbestos cloth 3 is required to completely separate the low-carbon steel plate 2 from the heat-resistant rubber 4, heat transfer is greatly reduced, the heat-resistant rubber 4 is prevented from being influenced by overhigh temperature, the low-carbon steel plate 2 is required to be made of a material with better plasticity, meanwhile, the titanium plate 1 to be processed is required to be completely covered, the asbestos cloth 3 is required to be prevented from being pressed against the titanium plate, so that the surface quality of the titanium plate is influenced, and the die 8 is required to be made of a material with better heat-conducting property, so that the titanium plate to be heated to the required forming temperature is facilitated.

When the novel rubber containing frame is used, the first layer in the rubber containing frame is filled with the common rubber 5 and then sequentially comprises the heat-resistant rubber 4, the asbestos cloth 3, the low-carbon steel plate 2 and the titanium plate 1 to be processed, and the novel rubber containing frame is placed on a die and a plate support. The die and the plate support are fixed on a heatable workbench, and a thermocouple sensing device is arranged on the workbench to monitor the temperature of the die.

Firstly, a heating rod is used for heating the die, heat is transferred to a titanium plate to be processed, and when the thermocouple sensor detects that the die reaches 600 ℃, the die starts to be processed. The press pushes the rubber containing frame, the common rubber fills the whole rubber containing frame, the heat-resistant rubber is tightly attached, asbestos cloth, a low-carbon steel plate and a titanium plate to be processed are sequentially pressed, the plate support 7 compresses the spring 6 to keep the balance of the plate until the titanium plate is tightly attached to the die 8, the pressure is maintained for a period of time, the forming of the titanium plate is finally completed, after the forming is completed, the rubber containing frame moves upwards, the common rubber 5, the heat-resistant rubber 4 and the spring 6 recover the shape, the obtained material object is as shown in fig. 3, the rebound is reduced, and the titanium alloy plate is easier to form at a high temperature.

It is noted that the clearance between the outer side of the plate supporting platform and the rubber containing frame is smaller than 1mm, so that rubber forming is guaranteed to be carried out in a sealed environment, a die 8 is fixed on a heating workbench 9 in a countersink threaded connection mode, a spring 6 plays a role in supporting the plate supporting plate and is made of high-temperature resistant materials, the plate supporting plate is connected with the heating workbench in a clearance fit mode, the supporting plate can slide up and down along a hole during forming, a thermocouple sensor is arranged on the side wall of the die, a lead wire of the thermocouple sensor can penetrate through the hole in the heatable workbench, and external monitoring equipment is connected.

It will be understood that modifications and variations will be apparent to those skilled in the art from the foregoing description, and it is intended that all such modifications and variations be included within the scope of the following claims.

Claims

1. A titanium alloy sheet rubber hot forming device, characterized in that it includes a rubber frame, in which ordinary rubber, heat-resistant rubber, asbestos cloth, low-carbon steel plate, and titanium plate to be processed are stacked in sequence, and also includes a forming mold and a heated workbench. The mold can be heated to a set temperature, and the heat of the mold is transferred to the titanium plate to be processed to heat the forming area of the titanium plate to be processed to the set temperature; the asbestos cloth separates the low-carbon steel and the heat-resistant rubber; the low-carbon steel plate is completely covered on the titanium plate to be processed during processing.

2. According to claim 1, the titanium alloy sheet rubber hot forming device is characterized in that the titanium plate to be processed is placed on a forming mold; the forming mold is fixed on the workbench through a countersink, and a thermocouple sensor is installed on the side wall of the forming mold.

3. The titanium alloy sheet rubber hot forming device according to claim 1 is characterized in that the heat-resistant rubber can withstand a high temperature of 290-300°C, and the flow properties remain unchanged during the forming process.

4. According to claim 1, the rubber hot forming device for titanium alloy sheets is characterized in that the low carbon steel plate has a thickness of 1 mm, is more flexible than the titanium plate to be formed, has a better surface quality, completely covers the titanium plate to be processed, separates the asbestos cloth from the titanium plate, and prevents the asbestos cloth from leaving indentations on the titanium plate during processing.

5. The titanium alloy sheet rubber hot forming device according to claim 1 is characterized in that the forming mold is made of a material that is resistant to high temperatures and has good thermal conductivity, and a thermocouple sensor is installed on the side wall of the forming mold to monitor the mold temperature in real time.

6. According to claim 1, the titanium alloy sheet rubber hot forming device is characterized in that the heated workbench has a hole for installing a heating rod, a control line is led out from the bottom, and the size of the workbench surface and the rubber frame form a matching size with a gap of less than 5 mm.

7. A method for rubber hot forming of titanium alloy sheet material according to any one of claims 1-6, characterized in that the forming mold is first heated by a heating rod, and when the thermocouple sensor measures that the forming mold has reached a specified temperature, a press pushes the rubber frame, and ordinary rubber fills the entire rubber frame, tightly against the heat-resistant rubber, and in turn presses the asbestos cloth, the low-carbon steel plate, and the titanium plate to be processed, until the titanium plate to be processed is tightly fitted with the mold, and finally the forming of the titanium plate is completed.