Forming die and process for complex titanium alloy parts

Abstract

The application discloses a complex titanium alloy part forming die and process, belongs to the titanium alloy part processing technical field, and aims to provide a complex titanium alloy part forming die and process, solves the problems that a transition pipe part on an existing helicopter engine cylindrical inhibitor is difficult to form and is prone to deformation after forming, and thus an assembly cannot be assembled. The part after die closing is processed in a drawing forming mode, the drawing height of the part is reduced, the bottom of the part is formed by one-time drawing forming, and the top is designed as a flanging forming, so that the forming difficulty is effectively reduced, the formed part has no obvious wrinkling and no rupture phenomenon, and material thinning meets the part requirement. The drawing forming and the flanging forming share a bottom plate, a concave die and a blank holder by replacing corresponding drawing punches and flanging punches, so that the mold cost is effectively reduced, and the economic benefit of enterprises is improved. The application is suitable for a complex titanium alloy part forming die and process.

Description

Technical Field

[0001] This invention belongs to the field of titanium alloy parts processing technology, specifically relating to a forming mold and process for complex titanium alloy parts. Background Technology

[0002] The transition tube component on the existing helicopter engine cylindrical suppressor is a thin-walled titanium alloy part with a complex surface. The part is difficult to form and is prone to deformation after forming. Machining the part according to the design model requires multiple forming processes and is difficult to form; after laser cutting, the part is prone to deformation, which may lead to the problem of the component being unable to be assembled due to large deformation. Summary of the Invention

[0003] The purpose of this invention is to provide a forming mold and process for complex titanium alloy parts, which solves the problem that the transition tube parts on the existing helicopter engine cylindrical suppressor are difficult to form and are prone to deformation after forming, resulting in the inability to assemble the components.

[0004] The technical solution adopted in this invention is as follows: A complex titanium alloy part forming die includes a base plate, a drawing punch, a flanging punch, a die cavity, and a coupling die. Guide plates are connected to both sides of the base plate, and pressure rings are installed on the guide plates.

[0005] A forming process for complex titanium alloy parts includes the following steps: (1) Based on the structural characteristics of the left and right parts, the lower part of the left part and the lower part of the right part, which are symmetrical, are designed for mold closing processing, and the upper part of the left part and the upper part of the right part, which are symmetrical, are designed for mold closing processing; (2) Obtain titanium alloy materials, complete laser cutting based on the required sheet size, and perform clamping after cutting; (3) Forming of the lower left and lower right parts: (3.1) Assemble the base plate, guide plate, drawing punch, blank holder, and die, perform the first thermoforming, draw the sheet metal, and form the bottom of the part; (3.2) After the deep drawing is completed, the flanged pre-hole is cut by laser and the hole is polished for the second time; (3.3) Take out the drawing punch, and assemble the base plate, guide plate, flanging punch, pressure ring and die for the second thermoforming. When closing the mold, use the part surface formed during the first drawing process to position the part, and then form the flanging. (3.4) After the flanging is completed, the lower part of the left part and the lower part of the right part are separated by five-axis laser cutting; (4) Forming of the upper part of the left part and the upper part of the right part: (4.1) The upper part of the left part and the upper part of the right part are not made of the same material when they are molded together. The corresponding sheet metal is pre-bent and then assembled with the coupling mold to complete the thermoforming of the upper part of the left part and the upper part of the right part using the coupling mold. (4.2) After the coupling mold thermoforming is completed, the upper part of the left part and the upper part of the right part are separated by five-axis laser cutting; (5) After the lower part of the separated left part, the lower part of the right part, the upper part of the left part, and the upper part of the right part are repaired by clamping, they are pickled, and then repaired by clamping again. (6) Polish the lower part of the left part, the lower part of the right part, the upper part of the left part, and the upper part of the right part; (7) After grinding, weld the lower part of the left part to the upper part of the left part, and weld the lower part of the right part to the upper part of the right part. After welding, inspect the finished product. After passing the inspection, package and put it into the warehouse.

[0006] Furthermore, in step (3.1), the forming temperature during the first thermoforming is 680℃-720℃, the main cylinder pressure is 20-30T, the top cylinder pressure is 10-15T, and the heat and pressure holding time is 5-8min.

[0007] Furthermore, in step (3.3), the forming temperature during the second thermoforming is 680℃-720℃, the main cylinder pressure is 15-20T, the top cylinder pressure is 5-10T, the holding pressure is 100T, and the heat and pressure holding time is 5-8min.

[0008] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1. In this invention, the lower parts of the left and right components after mold closing are processed by deep drawing. Due to the high height of the parts and the uneven height at the top, the deep drawing coefficient is small during the first deep drawing, which easily leads to the risk of tearing and wrinkling. By reducing the deep drawing height of the parts, the bottom of the parts is deep drawn in one step, and the top is designed as a flange, the forming difficulty is effectively reduced. The formed parts have no obvious wrinkles or cracks, and the material thinning meets the requirements of the parts.

[0009] 2. In this invention, the lower left and lower right parts after mold closing can share the same base plate, die, and pressure ring by replacing the corresponding drawing punch and flanging punch during the first and second thermoforming processes. This effectively reduces mold costs and improves the economic benefits of enterprises.

[0010] 3. In this invention, the upper parts of the left and right parts are similar to arcs. After the mold is closed, the upper parts of the left and right parts are processed by coupling mold forming. The upper parts of the left and right parts do not share materials when the mold is closed. The sheet metal is pre-bent and then formed, which can not only reduce the consumption of raw materials, but also effectively reduce the influence of the process surface on the part surface and reduce the springback of the part after demolding. Attached Figure Description

[0011] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort, wherein: Figure 1 This is a schematic diagram of the structure of the left component of the present invention; Figure 2 This is a schematic diagram of the structure of the right component of the present invention; Figure 3 This is a schematic diagram of the forming molds for the lower left and lower right parts of the present invention; Figure 4 This is a schematic diagram of the forming molds for the upper left and upper right parts of the present invention; Figure 5 This is a schematic diagram of the lower left and lower right parts of the mold being closed according to the present invention; Figure 6 This is a schematic diagram of the pre-cut holes for the lower left and lower right parts of the mold in this invention; Figure 7 This is a schematic diagram of the flange forming of the lower left and lower right parts of the present invention; Figure 8 This is a flowchart illustrating the processing of the lower left and lower right parts of the present invention.

[0012] The markings in the diagram are: 01-Die, 02-Sheet metal, 03-Blank ring, 04-Drawing punch, 05-Base plate, 06-Guide plate, 07-Flanging punch, 08-Upper part of left piece, 09-Lower part of left piece, 010-Lower part of right piece, 011-Upper part of right piece. Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0014] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0015] It should be noted that the labels and letters in the following figures represent similar items, therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0016] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. They are only used for the purpose of simplifying the description of this invention and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0017] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0018] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0019] A complex titanium alloy part forming die includes a base plate, a drawing punch, a flanging punch, a die cavity, and a coupling die. Guide plates are connected to both sides of the base plate, and pressure rings are installed on the guide plates.

[0020] A forming process for complex titanium alloy parts includes the following steps: (1) Based on the structural characteristics of the left and right parts, the lower part of the left part and the lower part of the right part, which are symmetrical, are designed for mold closing processing, and the upper part of the left part and the upper part of the right part, which are symmetrical, are designed for mold closing processing; (2) Obtain titanium alloy materials, complete laser cutting based on the required sheet size, and perform clamping after cutting; (3) Forming of the lower left and lower right parts: (3.1) Assemble the base plate, guide plate, drawing punch, blank holder, and die, perform the first thermoforming, draw the sheet metal, and form the bottom of the part; (3.2) After the deep drawing is completed, the flanged pre-hole is cut by laser and the hole is polished for the second time; (3.3) Take out the drawing punch, and assemble the base plate, guide plate, flanging punch, pressure ring and die for the second thermoforming. When closing the mold, use the part surface formed during the first drawing process to position the part, and then form the flanging. (3.4) After the flanging is completed, the lower part of the left part and the lower part of the right part are separated by five-axis laser cutting; (4) Forming of the upper part of the left part and the upper part of the right part: (4.1) The upper part of the left part and the upper part of the right part are not made of the same material when they are molded together. The corresponding sheet metal is pre-bent and then assembled with the coupling mold to complete the thermoforming of the upper part of the left part and the upper part of the right part using the coupling mold. (4.2) After the coupling mold thermoforming is completed, the upper part of the left part and the upper part of the right part are separated by five-axis laser cutting; (5) After the lower part of the separated left part, the lower part of the right part, the upper part of the left part, and the upper part of the right part are repaired by clamping, they are pickled, and then repaired by clamping again. (6) Polish the lower part of the left part, the lower part of the right part, the upper part of the left part, and the upper part of the right part; (7) After grinding, weld the lower part of the left part to the upper part of the left part, and weld the lower part of the right part to the upper part of the right part. After welding, inspect the finished product. After passing the inspection, package and put it into the warehouse.

[0021] Furthermore, in step (3.1), the forming temperature during the first thermoforming is 680℃-720℃, the main cylinder pressure is 20-30T, the top cylinder pressure is 10-15T, and the heat and pressure holding time is 5-8min.

[0022] Furthermore, in step (3.3), the forming temperature during the second thermoforming is 680℃-720℃, the main cylinder pressure is 15-20T, the top cylinder pressure is 5-10T, the holding pressure is 100T, and the heat and pressure holding time is 5-8min.

[0023] In the implementation of this invention, the lower left and right parts after mold closing are processed by deep drawing. Due to the high height of the parts and uneven top height, the deep drawing coefficient is small during the first deep drawing, which easily leads to the risk of tearing and wrinkling. By reducing the deep drawing height of the parts, the bottom of the parts is deep drawn in the first time, and the top is designed as a flange, the forming difficulty is effectively reduced. The formed parts have no obvious wrinkling or cracking, and the material thinning meets the part requirements. After mold closing, the lower left and right parts are processed by changing the corresponding deep drawing punch and flange punch during the first and second thermoforming, while sharing the base plate, die, and pressure ring, which effectively reduces mold costs and improves the economic benefits of the enterprise. The upper left and right parts have a similar arc shape. After mold closing, the upper left and right parts are processed by coupling mold forming. The upper left and right parts do not share material during mold closing. The sheet metal is pre-bent before forming, which not only reduces the consumption of raw materials, but also effectively reduces the impact of the process surface on the part surface and reduces the springback after demolding.

[0024] Example 1

[0025] A complex titanium alloy part forming die includes a base plate, a drawing punch, a flanging punch, a die cavity, and a coupling die. Guide plates are connected to both sides of the base plate, and pressure rings are installed on the guide plates.

[0026] Example 2

[0027] A forming process for complex titanium alloy parts includes the following steps: (1) Based on the structural characteristics of the left and right parts, the lower part of the left part and the lower part of the right part, which are symmetrical, are designed for mold closing processing, and the upper part of the left part and the upper part of the right part, which are symmetrical, are designed for mold closing processing; (2) Obtain titanium alloy materials, complete laser cutting based on the required sheet size, and perform clamping after cutting; (3) Forming of the lower left and lower right parts: (3.1) Assemble the base plate, guide plate, drawing punch, blank holder, and die, perform the first thermoforming, draw the sheet metal, and form the bottom of the part; (3.2) After the deep drawing is completed, the flanged pre-hole is cut by laser and the hole is polished for the second time; (3.3) Take out the drawing punch, and assemble the base plate, guide plate, flanging punch, pressure ring and die for the second thermoforming. When closing the mold, use the part surface formed during the first drawing process to position the part, and then form the flanging. (3.4) After the flanging is completed, the lower part of the left part and the lower part of the right part are separated by five-axis laser cutting; (4) Forming of the upper part of the left part and the upper part of the right part: (4.1) The upper part of the left part and the upper part of the right part are not made of the same material when they are molded together. The corresponding sheet metal is pre-bent and then assembled with the coupling mold to complete the thermoforming of the upper part of the left part and the upper part of the right part using the coupling mold. (4.2) After the coupling mold thermoforming is completed, the upper part of the left part and the upper part of the right part are separated by five-axis laser cutting; (5) After the lower part of the separated left part, the lower part of the right part, the upper part of the left part, and the upper part of the right part are repaired by clamping, they are pickled, and then repaired by clamping again. (6) Polish the lower part of the left part, the lower part of the right part, the upper part of the left part, and the upper part of the right part; (7) After grinding, weld the lower part of the left part to the upper part of the left part, and weld the lower part of the right part to the upper part of the right part. After welding, inspect the finished product. After passing the inspection, package and put it into the warehouse.

[0028] Example 3

[0029] Based on Example 2, in step (3.1), the forming temperature during the first thermoforming is 680℃-720℃, the main cylinder pressure is 20-30T, the top cylinder pressure is 10-15T, and the heat and pressure holding time is 5-8min.

[0030] Example 4

[0031] Based on Example 2, in step (3.3), the forming temperature during the second thermoforming is 680℃-720℃, the main cylinder pressure is 15-20T, the top cylinder pressure is 5-10T, the holding pressure is 100T, and the heat and pressure holding time is 5-8min.

[0032] The above description constitutes an embodiment of the present invention. The foregoing descriptions are preferred embodiments of the present invention. Unless there is a clear contradiction or a prerequisite for a particular preferred embodiment, the preferred embodiments can be arbitrarily combined and used. The embodiments and specific parameters described are merely for clearly illustrating the verification process of the invention and are not intended to limit the scope of patent protection of the present invention. The scope of patent protection of the present invention is still determined by its claims. Similarly, any equivalent structural changes made based on the description and drawings of the present invention should also be included within the scope of protection of the present invention.

Claims

1. A forming process for complex titanium alloy parts, characterized in that, Includes the following steps: (1) Based on the structural characteristics of the left and right parts, the lower part of the left part and the lower part of the right part, which are symmetrical, are designed for mold closing processing, and the upper part of the left part and the upper part of the right part, which are symmetrical, are designed for mold closing processing; (2) Obtain titanium alloy materials, complete laser cutting based on the required sheet size, and perform clamping after cutting; (3) Forming of the lower part of the left part and the lower part of the right part: (3.1) Assemble the base plate, guide plate, drawing punch, blank holder, and die, perform the first thermoforming, draw the sheet metal, and form the bottom of the part; (3.2) After the deep drawing is completed, the flanged pre-hole is cut by laser and the hole is polished for the second time; (3.3) Take out the drawing punch, and assemble the base plate, guide plate, flanging punch, pressure ring and die for the second thermoforming. When closing the mold, use the part surface formed in the first drawing process to position the part, and then form the flanging. (3.4) After the flanging is completed, the lower part of the left part and the lower part of the right part are separated by five-axis laser cutting; (4) Forming of the upper part of the left part and the upper part of the right part: (4.1) The upper part of the left part and the upper part of the right part are not made of the same material when they are molded together. The corresponding sheet metal is pre-bent and then assembled with the coupling mold. The upper part of the left part and the upper part of the right part are thermoformed by the coupling mold. (4.2) After the coupling mold thermoforming is completed, the upper part of the left part and the upper part of the right part are separated by five-axis laser cutting; (5) After the lower part of the separated left part, the lower part of the right part, the upper part of the left part, and the upper part of the right part are repaired by clamping, they are pickled, and then repaired by clamping again. (6) Polish the lower part of the left part, the lower part of the right part, the upper part of the left part, and the upper part of the right part; (7) After grinding, weld the lower part of the left part to the upper part of the left part, and weld the lower part of the right part to the upper part of the right part. After welding, inspect the finished product. After passing the inspection, package and put it into the warehouse.

2. The forming process for complex titanium alloy parts according to claim 1, characterized in that, In step (3.1), the forming temperature during the first thermoforming is 680℃-720℃, the main cylinder pressure is 20-30T, the top cylinder pressure is 10-15T, and the heat and pressure holding time is 5-8min.

3. A forming process for complex titanium alloy parts according to claim 1, characterized in that, In step (3.3), the forming temperature during the second thermoforming is 680℃-720℃, the main cylinder pressure is 15-20T, the top cylinder pressure is 5-10T, and the heat and pressure holding time is 5-8min.

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