Double-supporting-shaft bushing forming die

Abstract

The utility model belongs to the field of forming dies, and provides a double-supporting-shaft bushing forming die which comprises a punch, a lower die assembly and an ejection assembly. The punch forms a through hole and is used for moving in the axial direction of the through hole. The lower die assembly comprises a bottom die, a middle die and a female die which are arranged at intervals with the punch and sequentially stacked in the axial direction of the through hole, and further comprises a core rod connected to the bottom die and a movable sleeve coaxially and movably arranged on the core rod in a sleeving mode, and the core rod penetrates through the middle die and the female die and is coaxial and matched with the through hole. The movable sleeve is located on the side, away from the bottom die, of the middle die and can abut against the middle die in the process of moving relative to the core rod, a gap allowing the movable sleeve to pass through is formed between the female die and the core rod, and the female die is matched with the core rod and the movable sleeve to form a cavity used for forming a target tubular blank; the ejection assembly is in transmission connection with the movable sleeve and used for driving the movable sleeve.

Description

Technical Field

[0001] The present application belongs to the field of forming dies, and in particular to a double-support shaft bushing forming die. Background Art

[0002] As an indispensable component in mechanical equipment, the traditional preparation method of bushing is to use long round bars as raw materials, first use a cutting machine to cut the round bars into a set length, and then send them to stamping equipment such as a hydraulic press or a punching machine, and use a mold to use a positive extrusion and then punching process to make them. Since waste is generated during the extrusion and punching process, the material utilization rate is low, which causes a waste of raw materials and further increases the production cost of the bushing. Therefore, it is necessary to solve the above technical problems. Summary of the invention

[0003] The purpose of the embodiments of the present application is to provide a double-support shaft bushing forming die to solve the technical problem of high bushing production cost in the prior art.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted in the present application is: to provide a double-support shaft bushing forming die, comprising:

[0005] A punch, forming a through hole and used to move along the axial direction of the through hole;

[0006] A lower die assembly, comprising a bottom die, an intermediate die and a concave die which are spaced apart from the punch and stacked in sequence along the axial direction of the through hole, and further comprising a mandrel connected to the bottom die and a movable sleeve coaxially movably sleeved on the mandrel, the mandrel passing through the intermediate die and the concave die and being coaxial and adapted to the through hole, the movable sleeve being located on a side of the intermediate die away from the bottom die and being able to abut against the intermediate die during movement relative to the mandrel, a space for the movable sleeve to pass through is formed between the concave die and the mandrel, and the concave die cooperates with the mandrel and the movable sleeve to form a cavity for molding a target tubular blank;

[0007] The ejection assembly is transmission-connected with the movable sleeve and is used to drive the movable sleeve.

[0008] Optionally, the movable sleeve forms a first flange coaxial with the core rod at one end close to the middle mold, and the female mold cooperates with the middle mold to form a first accommodating cavity for the first flange to move.

[0009] Optionally, the lower mold assembly further includes a spring sleeved on the movable sleeve and located in the first accommodating cavity;

[0010] Two ends of the spring along its own elastic deformation direction are respectively in contact with the first flange and the concave mold.

[0011] Optionally, the ejection assembly includes an ejector rod that movably passes through the middle mold and extends into the first accommodating cavity to abut against the first flange;

[0012] The push rod and the spring are in contact with each other at two opposite sides of the first flange, and the moving direction of the push rod is parallel to the elastic deformation direction of the spring.

[0013] Optionally, the ejection assembly further comprises an ejection rod coaxial with the mandrel;

[0014] The ejector pin is located at a side of the bottom mold away from the middle mold, and a plurality of ejector pins are evenly arranged around the central axis of the core rod and are all connected to the ejector pin.

[0015] Optionally, a second flange is formed at one end of the ejector pin close to the core rod, and the ejector pin is connected to the ejector pin via the second flange.

[0016] Optionally, the bottom mold is recessed to form a second accommodating cavity for the second flange to move.

[0017] Optionally, the lower mold assembly further includes an outer cylinder that is open and used to accommodate the bottom mold, the middle mold, and the concave mold;

[0018] The opening of the outer cylinder faces the punch.

[0019] Optionally, the lower die assembly further comprises a gland detachably connected to the outer cylinder, and the bottom die, the middle die and the concave die are clamped between the gland and the bottom wall of the outer cylinder;

[0020] The gland is provided with a notch for the punch to pass through.

[0021] Optionally, the core rod is detachably connected to the bottom mold.

[0022] The beneficial effect of the double-support shaft bushing forming die provided by the present application is that: compared with the prior art, in the double-support shaft bushing forming die provided by the present application, the punch forms a through hole and can move along the axial direction of the through hole, the mandrel connected to the bottom die in the lower die assembly is coaxially adapted to the through hole and can be supported by the bottom die, the movable sleeve that is movably sleeved on the mandrel can be supported by the middle die stacked with the bottom die, and the concave die stacked with the middle die can cooperate with the mandrel and the movable sleeve to form a tubular cavity. In this way, when the target tubular blank is sleeved on the mandrel and located in the cavity, the punch can directly punch the target tubular blank sleeved on the mandrel into a bushing through its own through hole and the mandrel, and no punching waste will be generated, and the formed bushing can be quickly demoulded by the movable sleeve that can move relative to the mandrel. Therefore, the use of the double-support shaft bushing forming die provided by the present application can make full use of the raw materials for bushing production and can significantly reduce the production cost of the bushing, which is far superior to the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0024] Figure 1 Schematic diagram of the cross-sectional structure of the double-support shaft bushing forming mold provided in the embodiment of the present application Figure 1 ;

[0025] Figure 2 Schematic diagram of the cross-sectional structure of the double-support shaft bushing forming mold provided in the embodiment of the present application Figure 2 ;

[0026] Figure 3 A schematic diagram of the bushing forming process provided in an embodiment of the present application.

[0027] Among them, the reference numerals in the figure are: 100, punch; 101, through hole; 201, bottom die; 202, intermediate die; 203, die; 204, core rod; 205, movable sleeve; 206, cavity; 207, first flange; 208, first accommodating cavity; 209, spring; 210, second accommodating cavity; 301, ejector rod; 302, ejector rod; 303, second flange; 401, outer cylinder; 402, pressure cover; 501, target tubular blank; 502, bushing. DETAILED DESCRIPTION

[0028] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0029] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0030] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0031] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0032] Please also read Figures 1 to 3 Now, a double-support shaft bushing forming die provided in the embodiment of the present application is described. The double-support shaft bushing forming die comprises a punch 100, a lower die assembly and an ejection assembly. Among them:

[0033] The punch 100 forms a through hole 101 and is used to move along the axial direction of the through hole 101; the lower die assembly includes a bottom die 201, an intermediate die 202 and a die 203 which are spaced apart from the punch 100 and stacked in sequence along the axial direction of the through hole 101, and also includes a core rod 204 connected to the bottom die 201 and a movable sleeve 205 coaxially movably sleeved on the core rod 204, the core rod 204 passes through the intermediate die 202 and the die 203 and is coaxial with and adapted to the through hole 101, the movable sleeve 205 is located on the side of the intermediate die 202 away from the bottom die 201 and can abut against the intermediate die 202 during the movement relative to the core rod 204, a gap is formed between the die 203 and the core rod 204 for the movable sleeve 205 to pass through, and the die 203 cooperates with the core rod 204 and the movable sleeve 205 to form a cavity 206 for forming a target tubular blank 501; the ejection assembly is transmission-connected to the movable sleeve 205 and is used to drive the movable sleeve 205.

[0034] According to the above structure provided in the present embodiment, in the double-support shaft bushing forming mold provided in the present embodiment, the punch 100 forms a through hole 101 and can move axially along the through hole 101, the core rod 204 connected to the bottom die 201 in the lower die assembly is coaxially adapted to the through hole 101 and can be supported by the bottom die 201, the movable sleeve 205 installed on the core rod 204 can be supported by the middle die 202 stacked with the bottom die 201, and the concave die 203 stacked with the middle die 202 can cooperate with the core rod 204 and the movable sleeve 205 to form a tubular cavity 206. In this way, after the present forming die is installed on a cold heading machine or a stamping device, the punch 100 is connected to the slider or target moving part of the cold heading machine or the stamping device, and the lower die assembly is connected to the die base or the corresponding target. When the target tubular blank 501 cut to a set length is sleeved on the mandrel 204 and is located in the cavity 206, the punch 100 can be driven by the moving part to adapt to the mandrel 204 through its through hole 101 and directly upset the target tubular blank 501 sleeved on the mandrel 204 into a bushing 502 without generating punching waste. The formed bushing 502 can be quickly demolded through the movable sleeve 205 that can move relative to the mandrel 204. At the same time, the upset forming strain is small, which effectively avoids cracking of the formed product and ensures product quality. Therefore, the double-support shaft bushing forming die provided in the present application can make full use of the raw materials for the production of the bushing 502 and can significantly reduce the production cost of the bushing 502, which is far superior to the prior art. In addition, in this embodiment, the core shaft matched with the through hole 101 on the punch 100 can also provide guidance for the movement process of the punch 100, which is beneficial to ensure that the bushing 502 has better forming quality. It can be understood here that the ejector rod 302 is transmission-connected with the ejection mechanism of the cold heading machine or stamping equipment, and the existing technology can be used.

[0035] In another embodiment of the present application, please refer to Figures 1 to 3 , the movable sleeve 205 is close to the end of the middle die to form a first flange 207 coaxial with the core rod 204, and the concave die 203 cooperates with the middle die 202 to form a first accommodating cavity 208 for the first flange 207 to move. According to the above structure provided in this embodiment, the movable sleeve 205 forming the first flange 207 can form a larger contact area with the middle die and is conducive to bearing a larger punching force, which is conducive to significantly improving the speed and quality of producing the bushing 502 by the double-support shaft bushing forming mold in this embodiment, and is also conducive to further reducing the production cost of the bushing 502.

[0036] In another embodiment of the present application, please refer to Figures 1 to 3The lower mold assembly also includes a spring 209 which is sleeved on the movable sleeve 205 and located in the first accommodating cavity 208. The two ends of the spring 209 along the direction of its own elastic deformation are respectively abutted against the first flange 207 and the concave mold 203. According to the above structure provided in this embodiment, the spring 209 connected between the first flange 207 and the concave mold 203 can make the movable sleeve 205 automatically return to the initial state of abutting against the middle mold 202, which is conducive to further improving the speed of producing the bushing 502 by the double-support shaft bushing forming mold in this embodiment and further reducing the production cost of the bushing 502.

[0037] In another embodiment of the present application, please refer to Figures 1 to 3 The ejector assembly includes an ejector rod 301 that movably passes through the middle mold 202 and extends into the first accommodating cavity 208 to abut against the first flange 207. The ejector rod 301 abuts against the spring 209 on opposite sides of the first flange 207, and the moving direction of the ejector rod 301 is parallel to the elastic deformation direction of the spring 209. According to the above structure provided in this embodiment, the ejector rod 301 whose moving direction is parallel to the elastic deformation direction of the spring 209 can more stably drive the movable sleeve 205 to move relative to the core rod 204, which is conducive to further improving the speed of producing the bushing 502 by the double-support shaft bushing forming mold in this embodiment and further reducing the production cost of the bushing 502.

[0038] In another embodiment of the present application, please refer to Figures 1 to 3 The ejection assembly further includes an ejector pin 302 coaxial with the core rod 204, the ejector pin 302 is located on the side of the bottom mold 201 away from the middle mold 202, and a plurality of ejector pins 301 are evenly arranged around the central axis of the core rod 204 and are all connected to the ejector pin 302. According to the above structure provided in this embodiment, the ejector pin 302 can stably drive the movable sleeve 205 to move relative to the core rod 204 through the plurality of ejector pins 301 connected thereto and evenly arranged around the central axis of the core rod 204, which is conducive to further improving the moving stability of the movable sleeve 205 and further reducing the production cost of the bushing 502.

[0039] In another embodiment of the present application, please refer to Figures 1 to 3 The second flange 303 is formed at one end of the ejector pin 302 close to the core rod 204, and the ejector pin 301 is connected to the ejector pin 302 through the second flange 303. According to the above structure provided in this embodiment, the second flange 303 formed on the ejector pin 302 can not only increase the number of ejector pins 301 connected to the ejector pin 302, but also increase the lateral spacing between the ejector pins 301, which is beneficial to further improve the moving stability of the movable sleeve 205 and further reduce the production cost of the bushing 502.

[0040] In another embodiment of the present application, please refer to Figures 1 to 3The bottom mold 201 is recessed to form a second accommodating cavity 210 for the second flange 303 to move. According to the above structure provided in this embodiment, the second accommodating cavity 210 formed on the bottom mold 201 can allow the second flange 303 to move and significantly reduce the length of the ejector rod 301, which is beneficial to further improve the moving stability of the movable sleeve 205 and further reduce the production cost of the bushing 502.

[0041] In another embodiment of the present application, please refer to Figures 1 to 3 The lower die assembly further includes an outer cylinder 401 which is formed with an opening and is used to accommodate the bottom die 201, the middle die 202 and the concave die 203, and the opening of the outer cylinder 401 faces the punch 100. According to the above structure provided in this embodiment, the outer cylinder 401 used to accommodate the bottom die 201, the middle die 202 and the concave die 203 can not only make the structure of the double-support shaft bushing forming mold provided in this embodiment more integrated, but also can make the forming process of the bushing 502 more stable by stabilizing the positions of the bottom die 201, the middle die 202 and the concave die 203, which is conducive to further improving the production speed and production quality of the bushing 502, and is also conducive to further reducing the production cost of the bushing 502.

[0042] In another embodiment of the present application, please refer to Figures 1 to 3 The lower die assembly further includes a pressure cover 402 detachably connected to the outer cylinder 401, the bottom die 201, the middle die 202 and the concave die 203 are clamped between the pressure cover 402 and the bottom wall of the outer cylinder 401, and a notch is provided on the pressure cover 402 for the punch 100 to pass through. According to the above structure provided in this embodiment, the pressure cover 402 can further stabilize the bottom die 201, the middle die 202 and the concave die 203 and further reduce the production cost of the bushing 502.

[0043] In another embodiment of the present application, please refer to Figures 1 to 3 The core rod 204 is detachably connected to the bottom mold 201. According to the above structure provided in this embodiment, the core rod 204 detachably connected to the bottom mold 201 can be easily replaced, which can be used to adapt to the production of bushings 502 with different inner diameters, and is also conducive to the rapid repair and replacement of the worn core rod 204.

[0044] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A double-support shaft bushing forming die, characterized in that: include: A punch (100) is formed to form a through hole (101) and is used to move along the axial direction of the through hole (101); The lower die assembly comprises a bottom die (201), an intermediate die (202) and a concave die (203) which are spaced apart from the punch (100) and stacked in sequence along the axial direction of the through hole (101), and also comprises a core rod (204) connected to the bottom die (201) and a movable sleeve (205) which is coaxially movable and sleeved on the core rod (204); the core rod (204) passes through the intermediate die (202) and the concave die (203) and is coaxial and adapted to the through hole (101); The movable sleeve (205) is located on a side of the middle mold (202) away from the bottom mold (201) and is capable of abutting against the middle mold (202) during movement relative to the mandrel (204); a gap is formed between the female mold (203) and the mandrel (204) for the movable sleeve (205) to pass through; the female mold (203) cooperates with the mandrel (204) and the movable sleeve (205) to form a cavity (206) for molding a target tubular blank (501); An ejection assembly is drivingly connected to the movable sleeve (205) and is used to drive the movable sleeve (205).

2. The double support shaft bushing forming die according to claim 1, characterized in that: The movable sleeve (205) forms a first flange (207) coaxial with the core rod (204) at one end close to the middle mold, and the concave mold (203) cooperates with the middle mold (202) to form a first accommodating cavity (208) for the first flange (207) to move.

3. The double support shaft bushing forming die according to claim 2, characterized in that: The lower mold assembly further comprises a spring (209) sleeved on the movable sleeve (205) and located in the first accommodating cavity (208); Two ends of the spring (209) along its own elastic deformation direction abut against the first flange (207) and the concave mold (203) respectively.

4. The double support shaft bushing forming die according to claim 3, characterized in that: The ejection assembly comprises an ejector rod (301) that movably passes through the middle mold (202) and extends into the first accommodating cavity (208) to abut against the first flange (207); The push rod (301) and the spring (209) are in contact with each other at two opposite sides of the first flange (207), and the moving direction of the push rod (301) is parallel to the elastic deformation direction of the spring (209).

5. The double support shaft bushing forming die according to claim 4, characterized in that: The ejection assembly further comprises an ejection rod (302) coaxial with the core rod (204); The ejector pin (302) is located on a side of the bottom mold (201) away from the middle mold (202), and a plurality of ejector pins (301) are evenly arranged around the central axis of the core rod (204) and are all connected to the ejector pin (302).

6. The double support shaft bushing forming die according to claim 5, characterized in that: A second flange (303) is formed at one end of the ejector rod (302) close to the core rod (204), and the ejector rod (301) is connected to the ejector rod (302) via the second flange (303).

7. The double support shaft bushing forming die according to claim 6, characterized in that: The bottom mold (201) is recessed to form a second accommodating cavity (210) for the second flange (303) to move.

8. The double support shaft bushing forming die according to any one of claims 1 to 7, characterized in that: The lower mold assembly further comprises an outer cylinder (401) which is open and is used to accommodate the bottom mold (201), the middle mold (202) and the concave mold (203); The opening of the outer cylinder (401) faces the punch (100).

9. The double support shaft bushing forming die according to claim 8, characterized in that: The lower mold assembly further comprises a pressure cover (402) detachably connected to the outer cylinder (401); the bottom mold (201), the middle mold (202) and the concave mold (203) are clamped between the pressure cover (402) and the bottom wall of the outer cylinder (401); The pressure cover (402) is provided with a notch for the punch (100) to pass through.

10. The double support shaft bushing forming die according to claim 1, characterized in that: The core rod (204) is detachably connected to the bottom mold (201).

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