A head for internal high pressure forming and a die
By designing a head and mold for internal high-pressure forming, the head includes a guide section, an interference section, and a flanging section, which solves the problem that the existing technology requires separate expansion and flanging processes. This allows for one-time completion of end processing in the internal high-pressure forming process, reducing costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HAINING ZHENGXUAN AUTOMOBILE LIGHTWEIGHT PARTS CO LTD
- Filing Date
- 2025-06-23
- Publication Date
- 2026-07-21
Smart Images
Figure CN224525732U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of mold technology, specifically relating to a head and mold for internal high-pressure forming. Background Technology
[0002] Internal high-pressure forming (also known as hydraulic forming) is a material forming process that uses tubing as raw material. High-pressure liquid (100-1000 MPa) is applied internally, and axial feeding is used to conform the tubing to a mold cavity, creating complex hollow parts such as reducers, bent-axis tubes, and multi-way tubes. The process consists of three stages: filling, forming, and shaping. First, the tubing is sealed and liquid is injected; then, pressure is applied for expansion and material replenishment; finally, pressure is increased to set the shape.
[0003] In recent years, internal high-pressure forming products have been widely used in the field of automotive structural parts. As the technology becomes more and more mature, the product design is becoming more and more diverse. Among them, the design of the product port part is more diverse. In addition to the requirement for precise edge lines, there is an increased demand for diverse shapes. This includes the requirement for port flanges, such as the internal high-pressure longitudinal beam of a certain car model chassis.
[0004] The current production process involves forming the tube blank under internal high pressure, followed by cold heading and end flanging, and finally, precise laser trimming of the flanged edges. While feasible, this process increases the number of steps and costs. The question for companies is whether they can find a method to complete both the internal high-pressure forming and end flanging in a single process. Summary of the Invention
[0005] In view of the shortcomings of the above-mentioned background technology, the purpose of this utility model is to provide a head and mold for internal high-pressure forming, which is specifically used to expand and flang the end of the tube blank during internal high-pressure forming, achieving two goals at once.
[0006] To solve the above-mentioned technical problems, the purpose of this utility model is achieved as follows:
[0007] An internally high-pressure formed head includes a main body section; the front end of the main body section protrudes into a forming section, the forming section includes a guide section located at the front end, the outer surface of the guide section is inclined outward from front to back to form a first conical surface; the guide section extends to the rear end to have an interference section, the interference section is columnar; the interference section extends to the rear end to have a flange section, the flange section is connected to the main body section, the overall outer surface of the flange section is concave and folded inward to form a first arc surface, the outer edge of the first arc surface is spliced with the outer periphery of the end face of the main body section;
[0008] The main body section and the forming section are connected by a water injection hole.
[0009] Based on the above scheme and as a preferred option, the end face of the guide section and the conical surface of the guide section are connected by a second arc surface transition.
[0010] Based on the above scheme and as a preferred option: the conical surface of the guide section and the straight surface of the interference section are connected by a first inclined surface.
[0011] A mold for internal high-pressure forming, the head of which includes an upper mold body and a lower mold body; the upper mold body and the lower mold body are symmetrically arranged vertically, and the front end surfaces of the upper mold body and the lower mold body are recessed to form a tube groove, the tube groove being used to insert a metal tube into the groove;
[0012] The rear end surfaces of the upper and lower mold bodies are recessed to form the main body groove, which is used for the main body segment to be inserted and attached; the pipe groove and the main body groove are staggered in height, and the two are connected by an outwardly convex arc surface as the shaping surface; the flange of the metal pipe is clamped between the first arc surface and the shaping surface.
[0013] Based on the above scheme and as a preferred option: the radial cross-section of the metal tube is elliptical, and the radial cross-sections of the main body section and the forming section are also elliptical.
[0014] The outstanding and beneficial technical effects of this utility model compared to the prior art are:
[0015] Compared with the prior art, the end cap of this utility model with internal high-pressure forming includes a main body section and a forming section. The forming section includes a guide section, an interference section and a sealing section. The guide section is used to guide the insertion into the end of the pipe. The interference section expands the pipe and performs a flange operation on the end of the pipe. The water injection hole is used for high-pressure water injection, which realizes the expansion and flange processing of the end of the pipe, achieving two goals at once. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the end cap structure of this utility model.
[0017] Figure 2 This is a schematic diagram of the mold structure of this utility model.
[0018] Figure 3 This is a schematic diagram of the mold structure of this utility model.
[0019] Figure 4 This is a schematic diagram of the molding process of this utility model.
[0020] Figure 5 This is a schematic diagram of the port expansion and flange structure of this utility model.
[0021] Reference numerals: Main body section 01; Water injection hole 010; Forming section 02; Guide section 03; First conical surface 030; Second arc surface 031; Interference section 04; First inclined surface 040; Flanged section 05; First arc surface 050; Upper mold body 10; Lower mold body 11; Pipe groove 110; Main body groove 111; Shaping surface 112; Metal pipe 12. Detailed Implementation
[0022] The present invention will be further described below with reference to the accompanying drawings and specific embodiments;
[0023] This embodiment provides a head with internal high-pressure forming, including a main body section 01; the main body section 01 is made of a metal block; the front end of the main body section 01 has a forming section 02 protruding out, and the forming section 02 and the main body section 01 are made of a single material to ensure that its strength is not easily damaged and can withstand the impact of high-pressure water.
[0024] The forming section 02 includes a guide section 03 located at the front end. The outer surface of the guide section 03 is inclined outward from front to back to form a first conical surface 030. The guide section 03 adopts a variable diameter design with a smaller front and a larger rear to form the first conical surface 030, which facilitates insertion into the tube blank port and will not cause impact damage to the tube blank port.
[0025] The guide section 03 extends to the rear end and has an interference section 04, which is columnar. The interference section 04 squeezes and fills the tube blank to achieve the expansion of the tube blank's end.
[0026] The interference section 04 extends backward to form a flange section 05, which is connected to the main body section 01. The outer surface of the flange section 05 is concave and folded to form a first arc surface 050. The flange section 05 contacts the end of the tube blank to achieve the flange effect. The outer edge of the first arc surface 050 is spliced with the outer periphery of the end face of the main body section 01. The end face of the main body section 01 also contacts the end of the tube blank to achieve a sealing effect, and the edge of the end of the tube blank will not protrude from the main body section 01.
[0027] The main body section 01 and the forming section 02 are connected by a water injection hole 010. High-pressure water is injected to apply pressure to the tube blank.
[0028] As described above, the end cap is inserted into the tube blank while high-pressure water is injected. The tube blank and the end cap move towards each other. The end of the tube blank contacts the interference section 04 to achieve expansion. Furthermore, the flange section 05 performs a flange operation on the end, achieving both expansion and flange operation at the same time.
[0029] Furthermore, the end face of the guide section 03 and the conical surface of the guide section 03 are connected by a second circular arc surface 031.
[0030] As mentioned above, the second arc surface 031 is used to avoid right-angled edges causing injury to people.
[0031] Furthermore, the conical surface of the guide section 03 and the straight surface of the interference section 04 are connected by a first inclined surface 040.
[0032] As described above, the first inclined plane 040 achieves the function of expansion.
[0033] A mold for internal high-pressure forming includes the aforementioned end cap; it also includes an upper mold body 10 and a lower mold body 11; the upper mold body 10 and the lower mold body 11 are arranged symmetrically above and below each other, and the front end surfaces of the upper mold body 10 and the lower mold body 11 are recessed to form a tube groove 110, which is used for inserting a metal tube 12 into the groove.
[0034] The upper mold body 10 and the lower mold body 11 are made of metal blocks. The upper mold body 10 and the lower mold body 11 wrap the metal tube 12 and the end cap to achieve a sealing effect. The tube groove 110 is used for the shape of the metal tube 12.
[0035] The rear end surfaces of the upper mold body 10 and the lower mold body 11 are recessed to form a main body groove 111, which is used for the main body segment 01 to be inserted and attached; the pipe groove 110 and the main body groove 111 are staggered in height, and the two are connected by an outwardly convex arc surface as a shaping surface 112; the flange of the metal pipe 12 is clamped between the first arc surface 050 and the shaping surface 112.
[0036] As described above, the arc surface on the main groove 111 works in conjunction with the flange section 05 on the end cap to achieve shaping and sealing effects.
[0037] Furthermore, the radial cross-section of the metal tube 12 is elliptical, and the radial cross-sections of the main body section 01 and the forming section 02 are also elliptical.
[0038] As described above, the cross-sectional shape of the end cap is the same as that of the metal tube 12, achieving the effects of insertion, expansion, and flanging.
[0039] In the description of this utility model, it should be understood that the terms "upper", "lower", "top", "bottom", "inner", "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 utility model product is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of this utility model and simplify the description, and are not intended to indicate or imply that the device or component 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 utility model.
[0040] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In this utility model, unless otherwise expressly specified and limited, the terms "installation," "setting," "connection," "fixing," and "screw-on," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection.
[0041] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape, and principle of the present utility model should be covered within the scope of protection of the present utility model.
Claims
1. A head formed by internal high pressure, characterized in that: It includes a main body section; the front end of the main body section has a forming section, the forming section includes a guide section located at the front end, the outer surface of the guide section is inclined outward from front to back to form a first conical surface; the guide section extends to the rear end to have an interference section, the interference section is columnar; the interference section extends to the rear end to have a flange section, the flange section is connected to the main body section, the overall outer surface of the flange section is concave and folded to form a first arc surface, the outer edge of the first arc surface is spliced with the outer periphery of the end face of the main body section; The main body section and the forming section are connected by a water injection hole.
2. The end cap formed by internal high pressure according to claim 1, characterized in that: The end face of the guide section and the conical surface of the guide section are connected by a second circular arc surface.
3. The end cap formed by internal high pressure according to claim 2, characterized in that: The conical surface of the guide section and the straight surface of the interference section are connected by a first inclined surface.
4. A mold for internal high-pressure forming, comprising a head as described in any one of claims 1-3; characterized in that: It also includes an upper mold body and a lower mold body; the upper mold body and the lower mold body are arranged symmetrically, and the front end surfaces of the upper mold body and the lower mold body are recessed to form a tube groove, which is used to insert and attach the metal tube; The rear end surfaces of the upper and lower mold bodies are recessed to form the main body groove, which is used for the main body segment to be inserted and attached; the pipe groove and the main body groove are staggered in height, and the two are connected by an outwardly convex arc surface as the shaping surface; the flange of the metal pipe is clamped between the first arc surface and the shaping surface.
5. The mold for internal high-pressure forming according to claim 4, characterized in that: The radial cross-section of the metal tube is elliptical, as are the radial cross-sections of the main body section and the forming section.