Die structure and process method for die assembly manufacturing of various titanium alloy parts with same thickness

Abstract

The invention relates to a die structure and a process method for manufacturing various types of titanium alloy parts with the same thickness through die assembly one-time hot forming, and belongs to the field of part machining. The mold structure comprises an upper mold and a lower mold, the upper mold corresponds to the lower mold in structure, and after mold closing, a cavity for containing the various titanium alloy parts with the same thickness is formed in the upper mold and the lower mold; pressing plate grooves are formed in the upper ends and the lower ends of the upper die and the lower die, and pressing plates on a hot forming machine tightly press the pressing plate grooves, so that the upper die and the lower die are respectively clamped on a machine tool; mold matching pin holes and mold matching pins are formed in the left sides and the right sides of the upper mold and the lower mold, and when the upper mold and the lower mold are installed, the mold matching pin holes and the mold matching pins align the opposite positions of the upper mold and the lower mold; a plurality of types of titanium alloy parts with the same thickness are fitted into one part before being formed. The invention has the following advantages: the die cost is reduced; and the working efficiency is improved, and the part forming quality is improved.

Description

Technical Field

[0001] This invention relates to a mold structure and process method for manufacturing various types of titanium alloy parts of the same thickness using a single hot forming process, belonging to the field of parts processing. Background Technology

[0002] Due to the high yield strength ratio and low elastic modulus of titanium alloys, forming them presents challenges such as narrow deformation range, susceptibility to cracking, significant springback, and difficulty in ensuring dimensional accuracy. To overcome these forming difficulties, titanium alloys generally need to be heated to high temperatures for forming. Therefore, if different types of titanium alloy parts are processed separately for each part type, a large number of hot forming and cutting dies are required, resulting in high costs. Furthermore, the overall manufacturing cycle for forming multiple types of parts is long, leading to low work efficiency. Summary of the Invention

[0003] The purpose of this invention is to provide a mold structure and process method for manufacturing multiple titanium alloy parts of similar thickness, which enables the forming of multiple titanium alloy parts of similar thickness in one heating and cooling process on a set of tooling, thereby saving tooling costs and shortening the manufacturing cycle.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a mold structure for manufacturing multiple titanium alloy parts of similar thickness, including an upper mold and a lower mold, the upper mold and the lower mold having corresponding structures, and after mold closing, forming a cavity inside to accommodate multiple titanium alloy parts of similar thickness; pressure plate grooves are provided at both the upper and lower ends of the upper mold and the lower mold, and the pressure plate on the thermoforming machine presses the pressure plate grooves, thereby clamping the upper mold and the lower mold onto the machine tool respectively; mold alignment pin holes and mold alignment pins are provided on the left and right sides of the upper mold and the lower mold, and when the upper mold and the lower mold are installed, the mold alignment pin holes and mold alignment pins align their relative positions; multiple titanium alloy parts of similar thickness are fitted into one part before forming.

[0005] Furthermore, it also includes positioning guide plates and positioning guide grooves, which are respectively set on the left and right sides of the upper and lower molds, and are used for mold structure positioning during the thermoforming of the fitted parts.

[0006] Furthermore, it also includes a positioning stop pin, which is set on one side of the lower mold cavity and used for positioning the fitted part during forming.

[0007] Furthermore, it also includes cutting reference points, which are set on the axis of symmetry within the upper and lower mold cavities, serving as reference points for cutting individual parts after the fitted part has been thermoformed.

[0008] Furthermore, it also includes a part removal slot, which is located on one side of the lower mold cavity for removing the fitted part after thermoforming.

[0009] Furthermore, lifting lugs are provided at both the upper and lower ends of the lower mold for lifting and moving the mold structure.

[0010] Another object of the present invention is to provide a hot forming process for various titanium alloy parts of similar thickness, employing the mold structure described above, and including the following steps: (1) The upper and lower molds are closed and heated. After the molds are heated to the temperature required for the titanium alloy parts, the furnace door of the hot forming machine is opened. (2) Raise the upper mold, place the fitted part blank into the lower mold, and position the blank by positioning the positioning stop pin; (3) After the part is unfolded and the blank is placed in place, close the machine tool furnace door. When the mold is heated to the required temperature, press down the upper mold. The upper mold is inserted into the guide groove of the lower mold through the positioning guide plate so that the upper and lower molds can be accurately positioned and closed when the mold is closed. (4) After the upper and lower molds are closed, the part is thermoformed for a certain period of time. The fitted thermoformed part is taken out through the part taking slot, and multiple fitted parts can be obtained by thermoforming at one time.

[0011] Another objective of this invention is to provide a cutting process for multiple titanium alloy parts of similar thickness after fitting. The fitted part dataset is used to compile a CNC shape cutting program on a laser cutting equipment. The cutting reference point during hot forming is used for positioning, and the shape cutting is performed according to the CNC cutting program. Thus, multiple titanium alloy parts of similar thickness can be cut from a fitted part.

[0012] Design principle: Multiple types of titanium alloy parts of the same thickness are fitted into one part. After being thermoformed by a set of molds, a cutting program is compiled using the dataset of fitted multiple part structures of different types to cut out the required shapes of multiple parts.

[0013] Compared with the prior art, the present invention has the following advantages: 1. It can form multiple types of parts in one step, reducing the number of thermoforming molds and cutting molds required, and lowering mold costs; 2. Simultaneous forming of multiple parts at one time reduces the heating and cooling time and cost of the thermoforming process, improves work efficiency, shortens the manufacturing cycle required for multiple parts, and allows for precise cutting of the parts' shapes in a cold state after multiple parts are molded together, resulting in higher positioning accuracy than in a hot state and improved part forming quality. Attached Figure Description

[0014] Figure 1 These are schematic diagrams of the parts structure in the embodiments of the present invention (a is a typical skin part; b is a typical cover part; c is a typical plate part). Figure 2 yes Figure 1 A schematic diagram of the component structure after fitting the three types of components; Figure 3 This is a schematic diagram of the lower mold structure in an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of the fitted part dataset used for cutting in an embodiment of the present invention; Figure 1-4 In the middle, 1. part removal slot; 2. mold setting pin; 3. positioning guide plate; 4. lifting lug; 5. pressure plate slot; 6. cutting reference point; 7. positioning stop pin; 8. positioning guide slot. Detailed Implementation

[0015] It should be noted that the terms "upper", "lower", "left", "right", etc., are used to describe the invention in accordance with the accompanying drawings or the usual usage. Those skilled in the art should understand them in accordance with the technical solution of this invention.

[0016] The following is in conjunction with the appendix Figure 1-4 The present invention will be further described in detail below: The following steps are numbered according to the process flow: 1. For multiple parts of the same type but different thicknesses... Figure 1 The typical parts shown are fitted into Figure 2 One of the parts shown; 2. Treat the fitted parts as a single part for thermoforming. A custom thermoforming mold is required before thermoforming. Since titanium alloy parts generally require heating to over 600℃ during thermoforming, manufacturing multiple parts using a single mold allows for the simultaneous thermoforming of different types of parts, saving manufacturing costs and improving efficiency. The mold structure for thermoforming is as follows: Figure 3 As shown; 3. Mold installation preparation before thermoforming: The thermoforming mold structure of this invention consists of a lower mold and an upper mold. The structure of the lower mold (cavity mold) is as follows: Figure 3 As shown, the upper mold (punch) structure corresponds to the die. During mold installation, the overhead crane lifts and moves the mold using the lifting lugs 4 on the mold. Both the upper and lower mold bodies have two rows of pressure plate grooves 5 so that the pressure plates on the thermoforming machine can clamp them onto the machine tool. The lower mold (die) of the thermoforming mold is fixed to the thermoforming machine tool platform by the pressure plate on the fixed platform of the thermoforming machine pressing the pressure plate grooves 5 on the mold. The upper mold (punch) is fixed to the top by the pressure plate on the liftable surface of the thermoforming machine pressing the pressure plate grooves 5 on the mold. During mold installation, the upper and lower molds are aligned relative to each other using the mold-aligning pins 2. 4. The specific thermoforming process of the mold of the present invention is as follows: (1) After the mold is installed according to step 3, the upper and lower molds are first put together and heated. After the mold is heated to the temperature required for the titanium alloy parts, the furnace door of the hot forming machine is opened. (2) The upper mold is raised and the part blank (the part unfolded blank after fitting multiple types of parts) is placed into the lower mold. The placement position of the blank is positioned by the positioning stop pin 7 (i.e., it is blocked by the positioning stop pin 7). (3) After the part blank is placed in place, the machine tool furnace door is closed. Because the temperature drops when the furnace door is opened, the upper mold is pressed down when the mold is heated to the required temperature. The upper mold is inserted into the positioning guide groove 8 of the lower mold through the positioning guide plate 3 so that the upper and lower molds can be accurately positioned and closed when the mold is closed. (4) After the upper and lower molds are closed, the part is thermoformed for a certain period of time. The fitted thermoformed part is taken out through the part taking slot 1, and multiple fitted parts can be obtained by thermoforming at one time.

[0017] 5. Cutting the outline of a single part: such as Figure 4 As shown, a CNC shape cutting program is compiled on a laser cutting machine using the fitted part dataset. Positioned at the cutting reference point 6 from thermoforming, the shape is cut according to the CNC cutting program. Thus, one skin part can be cut from a fitted part. Figure 1 (a typical part), 2 cover parts ( Figure 1 (typical part b) and 1 part with a plate ( Figure 1 (The typical part in C) is a titanium alloy part. Thus, through one hot forming process, the forming and cutting of multiple parts of three types with the same thickness have been completed.

[0018] The above embodiments are merely preferred embodiments of the present invention and do not constitute a limitation thereof. Any extensions, modifications, and equivalent substitutions made by those skilled in the art without departing from the design principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A die structure for the matched die manufacturing of a plurality of titanium alloy parts of similar thickness, comprising an upper die and a lower die, characterized in that: The upper die and the lower die are corresponding in structure, and a cavity for accommodating multiple titanium alloy parts of the same thickness is formed in the cavity after the upper die and the lower die are closed. A pressing plate groove is arranged at the upper end and the lower end of the upper die and the lower die, and the pressing plate groove is pressed by a pressing plate on a hot forming machine, so that the upper die and the lower die are clamped on the machine tool respectively. A die aligning pin hole and a die aligning pin are arranged at the left side and the right side of the upper die and the lower die, and the die aligning pin hole and the die aligning pin align the relative positions of the upper die and the lower die when the upper die and the lower die are installed. Multiple titanium alloy parts of the same thickness are fitted into one part before forming.

2. The mold structure for mold closure manufacturing of a plurality of similar thickness titanium alloy part as claimed in claim 1, wherein: The positioning guide plate and the positioning guide groove are arranged at the left side and the right side of the upper die and the lower die respectively, and are used for positioning the die structure during hot forming of the fitted part.

3. The mold structure for mold closure manufacturing of a plurality of similar thickness titanium alloy parts of claim 1, wherein: The positioning material blocking pin is arranged on one side in the cavity of the lower die, and is used for positioning during forming of the fitted part.

4. The mold structure for mold closure manufacturing of a plurality of similar thickness titanium alloy parts of claim 1, wherein: The cutting reference point is arranged on the symmetric axis in the cavity of the upper die and the lower die, and is used as a reference point for cutting the single part after hot forming of the fitted part.

5. The mold structure for mold closure manufacturing of a plurality of similar thickness titanium alloy parts of claim 1, wherein: The part taking groove is arranged on one side in the cavity of the lower die, and is used for taking the part after hot forming of the fitted part.

6. The mold structure for mold closure manufacturing of a plurality of similar thickness titanium alloy part as claimed in claim 1, wherein: Lugs are arranged at the upper end and the lower end of the lower die, and are used for lifting and moving the die structure.

7. A hot forming process for a plurality of titanium alloy parts of similar thickness, characterized in that: The die structure of any one of claims 1-6 is adopted, and the following steps are included, (1) The upper die and the lower die are heated, and the furnace door of the hot forming machine tool is opened after the die is heated to the required temperature of the titanium alloy part; (2) The upper die is lifted, the expanded blank of the fitted part is placed in the lower die, and the positioning material blocking pin is used to position the placement position of the blank; (3) The furnace door of the machine tool is closed after the expanded blank of the part is placed in position, and the upper die is pressed down when the die is heated to the required temperature again, so that the upper die is inserted into the guide groove of the lower die through the positioning guide plate, so that the upper die and the lower die can be accurately positioned and closed when the die is closed; (4) The upper die and the lower die are closed, and the hot forming of the part is completed after a certain pressure holding time, and the fitted hot formed part is taken out through the part taking groove, so that multiple parts of the fitted part are obtained by one-time hot forming.

8. A cutting process for a plurality of similar thickness titanium alloy parts after fitting, characterized in that: The data set of the fitted part is used for numerical control contour cutting program compilation on a laser cutting equipment, the cutting reference point during hot forming is positioned, and contour cutting is performed according to the numerical control cutting program, so that multiple titanium alloy parts of the same thickness can be cut on one fitted part.

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