A stepped press-fitting die
By eliminating the mold plate design and using staggered layers of female mold and punch mold to form steps, combined with high-speed steel and tungsten steel materials, the problems of concentricity and lifespan of traditional molds are solved, thus achieving extended mold lifespan and cost savings.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG JINJI AUTO PARTS
- Filing Date
- 2025-07-01
- Publication Date
- 2026-07-24
Smart Images
Figure CN224545439U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of mold technology, specifically relating to a stepped press mold. Background Technology
[0002] Traditional stepped products generally have two approaches: 1. The mold consists of two parts: a die plate and a female mold. This mold structure requires high concentricity, and ideally, the die plate and female mold should be manufactured by the same company. The pressing surface of the press must be smooth and flat; otherwise, the die plate after pressing may be uneven, affecting the product's concentricity and dimensional requirements. 2. Alternatively, the step can be directly integrated into the female mold to ensure product concentricity. This involves increasing the diameter of the tungsten carbide. However, because the steps are subjected to greater stress, the tungsten carbide at the steps may crack, resulting in a shorter mold life and easier breakage at the steps. The lifespan may not meet expectations.
[0003] Since the two conventional methods cannot meet the mold life requirements, replacing the mold plate and the female mold will reduce the on-site production efficiency and will not save costs. Therefore, it is necessary to design a mold structure that can meet the mold life requirements and save mold costs at the same time. Summary of the Invention
[0004] In view of the shortcomings of the above-mentioned background technology, the purpose of this utility model is to provide a stepped pressing mold that eliminates the use of mold pieces, and forms a stepped structure between the female mold and the die for molding.
[0005] To solve the above-mentioned technical problems, the purpose of this utility model is achieved as follows:
[0006] A stepped pressing mold includes a mold shell, a female mold, a die, and a pad block;
[0007] The front and rear end faces of the mold shell have a through hole; the female mold is fixed inside the front end of the through hole.
[0008] The front and rear ends of the female mold have a through second hole. The front end of the inner wall of the second hole is a straight section, which slopes backward and outward to form a first inclined section. The rear end of the female mold has a vertical venting groove, which is connected to the second hole.
[0009] The mold is cylindrical, with a through third hole on the front and rear ends; the front end of the lower part of the outer surface of the mold is a second straight section, the rear end of the lower part of the outer surface of the mold is a second inclined section; the upper part of the outer surface of the mold is a third straight section.
[0010] The mold is embedded and fixed inside the female mold. The second straight section is attached to the first straight section, the second inclined section is attached to the first inclined section, and there is a gap between the third straight section and the inner wall of the second through hole to form an air passage. The air passage is connected to the exhaust groove.
[0011] The front face of the mold and the front face of the female mold are staggered to form a step;
[0012] The rear end face of the mold is fixed against the pad block; the pad block and the female mold are spaced apart by an air venting groove, and the front and rear end faces of the pad block are provided with a fourth through hole, which is connected to the third through hole; the ejector pin is inserted through the fourth through hole.
[0013] Based on the above scheme and as a preferred embodiment of the above scheme: the front end of the inner wall of the first through hole is inclined backward and outward to form a third inclined section, and the rear end of the inner wall of the first through hole is a fourth straight section.
[0014] The front end of the outer surface of the female mold is the fourth inclined section, and the rear end of the outer surface of the female mold is the fifth straight section; the fourth inclined section is attached to the third inclined section, and the fifth straight section is attached to the fourth straight section.
[0015] Based on the above scheme and as a preferred option, the angle between the third inclined plane segment and the fourth straight plane segment is 170-180 degrees.
[0016] Based on the above scheme and as a preferred option: the angle between the first straight section of the female mold and the first ground section is 175-180 degrees; the angle between the first inclined section of the female mold and the horizontal line is 1-2 degrees.
[0017] Based on the above scheme and as a preferred option: the female mold is made of high-speed steel, and the die is made of tungsten steel.
[0018] The outstanding and beneficial technical effects of this utility model compared to the prior art are:
[0019] Compared with the prior art, the stepped pressing mold of this utility model includes a female mold fixed inside the mold shell, and an exhaust groove is opened at the tail end of the female mold; this ensures that the product step is full and there is no risk of air stagnation, which can improve the mold life and ensure that the product size is qualified.
[0020] The die is embedded and fixed inside the female mold. The front ends of the die and the female mold are staggered to form steps for product molding. Making the die a single piece reduces the risk of misalignment between molds.
[0021] The mold forming an air channel and venting groove in the female mold; on the other hand, in order to ensure the mold life at the step and prevent air from being trapped at the step due to the stress on the step, the design makes air holes at the step to ensure that the product step is full and the mold life is long.
[0022] The molding process uses an angled pressing method, which ensures that the product will not be pulled out during production due to molding pressing issues.
[0023] The straight end left at the front of the mold can be reused (recycled) when the step is damaged, thus saving costs.
[0024] The mold design uses a combination of high-speed steel and tungsten steel (high-speed steel is less hard than tungsten steel, so cracks will not occur at the steps), ensuring the mold's service life and saving costs. Attached Figure Description
[0025] Figure 1 This is a schematic diagram of the mold shell structure of this utility model.
[0026] Figure 2 This is a schematic diagram of the female mold structure of this utility model.
[0027] Figure 3 This is a schematic diagram of the molding structure of this utility model.
[0028] Figure 4 This is a schematic diagram of the pad structure of this utility model.
[0029] Figure 5 This is a partial structural schematic diagram of the present invention.
[0030] Figure 6 This is a schematic diagram of the overall structure of this utility model.
[0031] Reference numerals: Mold shell 1; First through hole 10; Third inclined section 100; Fourth straight section 101; Included angle; Female mold 2; Second through hole 20; First straight section 200; First inclined section 201; Included angle; Included angle; Venting groove 21; Fourth inclined section 22; Fifth straight section 23; Mold making 3; Third through hole 30; Second straight section 31; Second inclined section 32; Third straight section 33; Air passage 34; Step 35; Spacer block 4; Fourth through hole 40; Ejector pin 5. Detailed Implementation
[0032] The present invention will be further described below with reference to the accompanying drawings and specific embodiments;
[0033] This embodiment provides a stepped pressing mold, including a mold shell 1, a female mold 2, a punching mold 3, and a pad block 4;
[0034] The front and rear end faces of the mold shell 1 are provided with a through hole 10; the female mold 2 is embedded in the front end of the through hole 10 and fixed; the mold shell 1 is used as the outer shell and the female mold 2 is used for cold heading.
[0035] The front and rear ends of the female mold 2 are provided with a through second hole 20. The front end of the inner wall of the second through hole 20 is a first straight section 200. The straight section is inclined backward and outward to form a first inclined section 201. The first straight section 200 and the first inclined section 201 are connected to form an extended structure that is smaller in the front and larger in the back.
[0036] The rear end of the female mold 2 is provided with a vertical venting groove 21, which communicates with the second through hole 20; the venting groove 21 is used to discharge gas in the second through hole 20.
[0037] The die 3 is cylindrical, and the front and rear ends of the die 3 are provided with a through third hole 30; the front end of the lower part of the outer surface of the die 3 is a second straight section 31, the rear end of the lower part of the outer surface of the die 3 is a second inclined section 32; the upper part of the outer surface of the die 3 is a third straight section 33; the die 3 is inserted into the second through hole 20 for fixed use.
[0038] The mold 3 is embedded and fixed inside the female mold 2. The second straight section 31 is attached to the first straight section 200, the second inclined section 32 is attached to the first inclined section 201, and the third straight section 33 has a gap with the inner wall of the second through hole 20 to form an air passage 34, which is connected to the exhaust groove 21.
[0039] The front face of the die 3 and the front face of the female die 2 are staggered to form a step 35; the straight section left at the front of the die 3 can be reused (secondary use) when the step 35 is damaged, which saves costs.
[0040] The rear end face of the mold 3 is fixed against the pad block 4; the pad block 4 and the female mold 2 are spaced apart by an venting groove 21, and the front and rear end faces of the pad block 4 are provided with a fourth through hole 40, which communicates with the third through hole 30; the ejector pin 5 is inserted through the fourth through hole 40. During the product molding process, the gas inside the machine flows through the venting groove 21, which will not cause the risk of air stagnation. On the one hand, it can improve the mold life, and on the other hand, it can ensure that the product dimensions are qualified.
[0041] As described above, in the specific assembly process, the female mold 2 is embedded and fixed inside the mold shell 1, the die 3 is embedded and fixed inside the female mold 2, the pad block 4 holds the female mold 2 and the die 3 in place, and the ejector pin 5 is used to press the bolt; the step 35 formed by the die 3 and the female mold 2 is used for product molding.
[0042] Furthermore, the front end of the inner wall of the first through hole 10 is inclined backward and outward to form a third inclined section 100, and the rear end of the inner wall of the first through hole 10 is a fourth straight section 101.
[0043] The front end of the outer surface of the female mold 2 is the fourth inclined section 22, and the rear end of the outer surface of the female mold 2 is the fifth straight section 23; the fourth inclined section 22 is attached to the third inclined section 100, and the fifth straight section 23 is attached to the fourth straight section 101.
[0044] As described above, the first through hole 10 is smaller at the front and larger at the back to ensure that the female mold 2 will not fall out of the mold shell 1;
[0045] Furthermore, the angle between the third inclined section 100 and the fourth straight section 101 is 170-180 degrees.
[0046] As mentioned above, a large angle will result in an unstable clamping, while a small angle will cause the clamp to be too tight and inconvenient to remove later.
[0047] Furthermore, the angle between the first straight section 200 and the first ground section of the female mold 2 is 175-180 degrees; the female mold 2 adopts an angled pressing method, which ensures that the product will not be pulled out during production due to pressing problems with the female mold 2; the angle between the first inclined section 201 of the female mold 2 and the horizontal line is 1-2 degrees. The air passage 34 ensures that the product step 35 is full, and there is no risk of air stagnation. On the one hand, it can improve the mold life, and on the other hand, it can ensure that the product dimensions are qualified.
[0048] Furthermore, the female mold 2 is made of high-speed steel, and the die 3 is made of tungsten steel.
[0049] As mentioned above, the design uses a combination of high-speed steel and tungsten steel (the hardness of high-speed steel is lower than that of tungsten steel, so cracking will not occur at step 35) to ensure the service life of the mold.
[0050] 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.
[0051] 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.
[0052] 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 stepped press-fitting mold, characterized in that: Includes mold shell, female mold, molding die, and spacer block; The front and rear end faces of the mold shell have a through hole; the female mold is fixed inside the front end of the through hole. The front and rear ends of the female mold have a through second hole. The front end of the inner wall of the second hole is a straight section, which slopes backward and outward to form a first inclined section. The rear end of the female mold has a vertical venting groove, which is connected to the second hole. The mold is cylindrical, with a through third hole on the front and rear ends; the front end of the lower part of the outer surface of the mold is a second straight section, the rear end of the lower part of the outer surface of the mold is a second inclined section; the upper part of the outer surface of the mold is a third straight section. The mold is embedded and fixed inside the female mold. The second straight section is attached to the first straight section, the second inclined section is attached to the first inclined section, and there is a gap between the third straight section and the inner wall of the second through hole to form an air passage. The air passage is connected to the exhaust groove. The front face of the mold and the front face of the female mold are staggered to form a step; The rear end face of the mold is fixed against the pad block; the pad block and the female mold are spaced apart by an air venting groove, and the front and rear end faces of the pad block are provided with a fourth through hole, which is connected to the third through hole; the ejector pin is inserted through the fourth through hole.
2. The stepped press-fitting mold according to claim 1, characterized in that: The front end of the inner wall of the first through hole slopes backward and outward to form the third inclined section, and the rear end of the inner wall of the first through hole is the fourth straight section. The front end of the outer surface of the female mold is the fourth inclined section, and the rear end of the outer surface of the female mold is the fifth straight section; the fourth inclined section is attached to the third inclined section, and the fifth straight section is attached to the fourth straight section.
3. The stepped press-fitting mold according to claim 2, characterized in that: The angle between the third inclined section and the fourth straight section is 170-180 degrees.
4. The stepped press-fitting mold according to claim 1, characterized in that: The angle between the first straight section and the first ground section of the female mold is 175-180 degrees; the angle between the first inclined section of the female mold and the horizontal line is 1-2 degrees.
5. The stepped press-fitting mold according to claim 1, characterized in that: The female mold is made of high-speed steel, and the die is made of tungsten steel.