A rigid expansion structure for annular parts
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- TIANJIN NORIXIN AUTO PARTS CO LTD
- Filing Date
- 2026-05-22
- Publication Date
- 2026-07-03
AI Technical Summary
The existing rigid bulging mold structure relies on manual operation during the blank placement and positioning stage, resulting in low production efficiency, inconsistent product dimensions, and inability to adapt to modern, efficient, and automated production.
A rigid expansion structure for ring-shaped parts is designed, using an upper and lower template, and inner and outer expansion lobes combined to form inner and outer expansion modules. Automatic mold closing and forming is achieved through conical surface driving, and spring-driven expansion lobes are used to reset, eliminating manual intervention.
The automated expansion and contraction process improves the forming accuracy and batch stability of parts, shortens the forming cycle, reduces labor costs, and supports continuous production of small batches of high-precision parts with multiple specifications.
Smart Images
Figure CN122322346A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of materials processing technology, and in particular relates to a rigid expansion structure for annular parts. Background Technology
[0002] Rigid expansion molding is a key tooling for manufacturing rotating shell-type parts, especially suitable for forming parts in small batches, with multiple specifications or high precision requirements. Its basic principle is to use rigid, segmented inner and outer molds to apply radial pressure to the sheet metal blank placed between them under the drive of a hydraulic press, causing it to undergo plastic deformation and finally fit into the mold surface, thereby obtaining the part with the required shape and size.
[0003] However, in the existing rigid expansion mold structure, during the blank placement and positioning stage, operators must manually separate the segmented inner and outer molds to leave operating space. Then, the blank is placed manually, and the segmented outer molds are pushed inward to initially fit the blank. This process relies entirely on manual operation, interrupting the continuous operation of the equipment. The production cycle for a single piece is long, which cannot meet the needs of modern, efficient, and automated production. Furthermore, it is highly dependent on skilled operators, who need to manually place the segmented inner molds evenly along the circumference based on experience and intuition. This directly leads to large fluctuations in product dimensions and high labor costs.
[0004] Therefore, there is an urgent need to design a rigid expansion structure for ring-shaped parts to solve the problems of inconsistent product dimensions and low production efficiency mentioned above. Summary of the Invention
[0005] To address the technical problems of inconsistent product dimensions and low production efficiency mentioned in the background art, a rigid expansion structure for ring-shaped parts is provided to solve the above problems.
[0006] To achieve the above objectives, the specific technical solution of the rigid expansion structure of the annular part of the present invention is as follows: A rigid expansion structure for a ring-shaped part includes an upper template and a lower template, with multiple inner expansion lobes and multiple outer expansion lobes slidably connected on the lower template; Multiple inner expansion flaps are combined to form an inner expansion module. The outer wall of the inner expansion module forms a first contour. The multiple inner expansion flaps slide along the lower template to make the first contour expand proportionally. Multiple external expansion flaps are combined to form an external expansion module. The inner sidewall of the external expansion module forms a second contour. The multiple external expansion flaps slide along the lower template to make the second contour shrink proportionally. The inner bulging mold is located inside the outer bulging mold. The upper template drives the inner and outer bulging molds to move towards each other, so that the inner sidewall of the outer bulging mold fits against the outer sidewall of the inner bulging mold to form the mold surface of the ring-shaped part.
[0007] Furthermore, the outer sidewall of the inner expansion petal has a first texture, and the inner sidewall of the outer expansion petal has a second texture. After the inner sidewall of the outer expansion module is attached to the outer sidewall of the inner expansion module, multiple first textures combine to form a first annular surface, and multiple second textures combine to form a second annular surface. The first annular surface and the second annular surface are combined to form the mold surface of the annular part.
[0008] Furthermore, both the inner and outer expansion modules are annular. The lower template has a first slide rail, and a first slider is fixedly connected to the inner expansion petal. The first slider is slidably connected to the first slide rail so that the inner expansion petal slides along the lower template. The first slide rail is located on a straight line passing through the center of the inner expansion module. The lower template has a second slide rail, and a second slider is fixedly connected to the outer expansion petal. The second slider is slidably connected to the second slide rail so that the outer expansion petal slides along the lower template. The second slide rail is located on a straight line passing through the center of the outer expansion module.
[0009] Furthermore, a first spring is fixedly connected to the first slider, and the end of the first spring away from the first slider is fixedly connected to the first slide rail. The first spring releases its elastic force to drive the inner expansion flap to reset. A second spring is fixedly connected to the second slider, and the end of the second spring away from the second slider is fixedly connected to the second slide rail. The second spring releases its elastic force to drive the outer expansion flap to reset.
[0010] Furthermore, the upper template includes a first conical surface and a second conical surface. The first conical surface matches the inner sidewall of the inner expansion mold to form a conical fit. When the upper template moves downward, the first conical surface drives the inner expansion mold to slide along the lower template, so that the first contour expands proportionally. The second conical surface matches the outer sidewall of the outer expansion mold to form a conical fit. When the upper template moves downward, the second conical surface drives the outer expansion mold to slide along the lower template, so that the second contour contracts proportionally. The upper template drives the inner expansion mold and the outer expansion mold to move towards each other through the first and second conical surfaces.
[0011] Furthermore, a guide column is fixedly connected to the lower template, and the upper template is slidably connected to the guide column to guide the upper template in the vertical direction.
[0012] Furthermore, a first through hole is provided at the center of the upper template, and the upper template is slidably connected to the guide post through the first through hole.
[0013] Furthermore, a third slide rail is provided on the inner wall of the first through hole, and a third slider is fixedly connected to the guide post. The third slide rail and the third slider are slidably connected, thereby limiting the upper template in a circumferential direction.
[0014] The rigid expansion structure of the annular part of the present invention has the following advantages: This invention drives the inner expansion mold group to expand proportionally and the outer expansion mold group to contract proportionally through the first and second conical surfaces of the upper template. The mold closing and forming can be completed automatically with a single press. After forming, the spring drives each expansion petal to reset, reserving space for the next blank to be loaded. There is no need for manual pushing and pulling of the petal mold, realizing automatic expansion, contraction and reset, eliminating manual intervention.
[0015] In this invention, both the inner and outer expansion flaps move along a slide rail passing through the center of the circle. With the help of the first and second conical surfaces, strict radial synchronization and proportional deformation are ensured, eliminating the uncertainty of manual placement and greatly improving the forming accuracy and batch stability of parts.
[0016] This invention is suitable for processing small batches of multi-specification, high-precision annular rotating shell-type parts. It can form complex geometric contours in one step, shorten the forming cycle, support continuous and rhythmic production, reduce reliance on skilled workers, lower labor costs, and significantly improve production efficiency and economic benefits. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the overall rigid expansion structure of the annular part of the present invention; Figure 2 This is a schematic diagram of the lower template structure of the present invention; Figure 3 This is a schematic diagram of the internal flap structure of the present invention; Figure 4 This is a schematic diagram of the external flap structure of the present invention; Figure 5 This is a schematic diagram of the guide post structure of the present invention; Figure 6 This is a schematic diagram of the first and second slide rail structures of the present invention; Figure 7 This is a schematic diagram of the upper template structure of the present invention.
[0018] Explanation of markings in the diagram: 1. Upper template; 101. First conical surface; 102. Second conical surface; 103. First through hole; 1031. Third slide rail; 2. Lower template; 201. First slide rail; 202. Second slide rail; 3. Inner bulging module; 301. Inner bulging flap; 3011. First texture; 3012. First slider; 4. Outer bulging module; 401. Outer bulging flap; 4011. Second texture; 4012. Second slider; 5. First spring; 6. Second spring; 7. Guide post; 701. Third slider. Detailed Implementation
[0019] 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, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0020] Those skilled in the art will understand that although some embodiments herein include certain features included in other embodiments but not others, combinations of features from different embodiments are intended to be within the scope of the invention and form different embodiments. For example, in the claims, any of the claimed embodiments can be used in any combination.
[0021] The following is a reference to the appendix. Figure 1 To be continued Figure 7 The rigid expansion structure of the annular part of the present invention is described.
[0022] A rigid expansion structure for a ring-shaped part, such as Figures 1-4 As shown, the device includes an upper template 1 and a lower template 2. Multiple inner expansion flaps 301 and multiple outer expansion flaps 401 are slidably connected to the lower template 2. The multiple inner expansion flaps 301 combine to form an inner expansion module 3. The outer wall of the inner expansion module 3 forms a first contour. The multiple inner expansion flaps 301 slide along the lower template 2 to proportionally expand the first contour. The multiple outer expansion flaps 401 combine to form an outer expansion module 4. The inner wall of the outer expansion module 4 forms a second contour. The multiple outer expansion flaps 401 slide along the lower template 2 to proportionally contract the second contour. The inner expansion module 3 is located inside the outer expansion module 4. The upper template 1 drives the inner expansion module 3 and the outer expansion module 4 to move towards each other, thereby causing the inner wall of the outer expansion module 4 to fit against the outer wall of the inner expansion module 3 to form the mold surface of the annular part. Specifically, the upper template 1 can simultaneously complete the inner mold expansion and outer mold contraction with a single press, fitting together for shaping. At the same time, the proportional expansion and contraction mechanism ensures that each expansion petal moves uniformly in the radial direction, avoiding eccentricity or uneven gaps caused by manual placement, eliminating human error, and significantly improving the forming accuracy and batch stability of parts.
[0023] As a preferred option, such as Figure 2 and Figure 3As shown, the outer sidewall of the inner expansion petal 301 has a first texture 3011, and the inner sidewall of the outer expansion petal 401 has a second texture 4011. After the inner sidewall of the outer expansion module 4 is attached to the outer sidewall of the inner expansion module 3, multiple first textures 3011 combine to form a first annular surface, and multiple second textures 4011 combine to form a second annular surface. The first annular surface and the second annular surface are combined to form the mold surface of the annular part. Specifically, after the inner expansion petal 301 expands proportionally, the first textures 3011 combine to form the first annular surface, and the inner sidewall of the annular part is formed by processing the first annular surface; after the outer expansion petal 401 contracts proportionally, the second textures 4011 combine to form the second annular surface, and the outer sidewall of the annular part is formed by processing the second annular surface.
[0024] As a preferred option, such as Figures 2-6 As shown, both the inner expansion module 3 and the outer expansion module 4 are annular. The lower template 2 has a first slide rail 201. A first slider 3012 is fixedly connected to the inner expansion petal 301, and the first slider 3012 is slidably connected to the first slide rail 201, allowing the inner expansion petal 301 to slide along the lower template 2. The first slide rail 201 is located on a straight line passing through the center of the inner expansion module 3. The lower template 2 has a second slide rail 202. A second slider 4012 is fixedly connected to the outer expansion petal 401, and the second slider 4012 is slidably connected to the second slide rail 202, allowing the outer expansion petal 401 to slide along the lower template 2. The second slide rail 202 is located on a straight line passing through the center of the outer expansion module 4. Specifically, the first slide rail 201 and the second slide rail 202 are arranged along the diameter direction of the inner expansion module 3 and the outer expansion module 4, respectively, forcing each expansion petal to slide precisely radially, avoiding oblique offset, and ensuring geometric accuracy during proportional expansion and contraction. Figure 6 As shown, the second slide rail 202 includes two tracks, but the center lines of the two tracks still pass through the diameter of the outer expansion module 4. In fact, the outer expansion petals 401 on the second slide rail 202 also move on a straight line passing through the center of the outer expansion module 4. Therefore, it is also a conventional variation of this technology, and will not be elaborated here.
[0025] As a preferred option, such as Figure 6As shown, a first spring 5 is fixedly connected to the first slider 3012. The end of the first spring 5 away from the first slider 3012 is fixedly connected to the first slide rail 201. The first spring 5 releases its elastic force to drive the inner expansion petal 301 to reset. A second spring 6 is fixedly connected to the second slider 4012. The end of the second spring 6 away from the second slider 4012 is fixedly connected to the second slide rail 202. The second spring 6 releases its elastic force to drive the outer expansion petal 401 to reset. Specifically, after the annular part is formed, the upper template 1 rises. The first spring 5 pulls the inner expansion petal 301 back to its initial position, and the second spring 6 pulls the outer expansion petal 401 back to its initial position, leaving enough space to pick up and put down the blank. At the same time, passive reset is achieved by using the first spring 5 and the second spring 6. The structure is simple, the cost is low, the failure rate is low, the manual reset step is eliminated, and the production efficiency is improved. The arrangement of the first spring 5 and the second spring 6 can be described as follows: Figure 6 As shown, limiting blocks are provided on the first slide rail 201 and the second slide rail 202. The first spring 5 and the second spring 6 can be fixedly connected to the first slide rail 201 and the second slide rail 202 by the limiting blocks, or they can be connected by reserving abutment grooves, which will not be described in detail here.
[0026] As a preferred option, such as Figure 2 and Figure 7 As shown, the upper template 1 includes a first conical surface 101 and a second conical surface 102. The first conical surface 101 matches the inner sidewall of the inner expansion mold 3 to form a conical fit. When the upper template 1 moves downward, the first conical surface 101 drives the inner expansion mold 3 to slide along the lower template 2 so that the first contour expands proportionally. The second conical surface 102 matches the outer sidewall of the outer expansion mold 4 to form a conical fit. When the upper template 1 moves downward, the second conical surface 102 drives the outer expansion mold 4 to slide along the lower template 2 so that the second contour contracts proportionally. The upper template 1 drives the inner expansion mold 3 and the outer expansion mold 4 to move towards each other through the first conical surface 101 and the second conical surface 102. Specifically, when the upper template 1 descends, it synchronously drives the inner expansion mold 3 and the outer expansion mold 4 to move in opposite directions. The conical fit provides a continuous and progressive radial force component, avoids impact, and is conducive to uniform deformation of the sheet metal, thereby making the force transmission stable and controllable.
[0027] As a preferred option, such as Figure 1 and Figure 2 As shown, a guide post 7 is fixedly connected to the lower template 2, and the upper template 1 is slidably connected to the guide post 7 to guide the upper template 1 in the vertical direction. Specifically, the slidable connection between the upper template 1 and the guide post 7 ensures the vertical movement of the upper template 1, improves the repeatability of mold closing positioning accuracy, and enhances product consistency.
[0028] As a preferred option, such as Figure 1 and Figure 2As shown, a first through hole 103 is provided at the center of the upper template 1. The upper template 1 is slidably connected to the guide post 7 through the first through hole 103. Specifically, the guide post 7 is located at the center of the upper template 1, with a symmetrical structure and balanced force. The central guide makes the pressure evenly distributed throughout the expansion structure. At the same time, the guide post 7 is located in the center and does not occupy the surrounding working area, which facilitates the arrangement of the inner expansion petal 301 and the outer expansion petal 401.
[0029] As a preferred option, such as Figure 5 and Figure 7 As shown, a third slide rail 1031 is provided on the inner wall of the first through hole 103, and a third slider 701 is fixedly connected to the guide post 7. The third slide rail 1031 and the third slider 701 are slidably connected to each other, thereby limiting the upper template 1 in the circumferential direction. Specifically, the third slide rail 1031 is provided in the first through hole 103, and the third slider 701 is provided in the guide post 7 to achieve circumferential limiting, prevent the upper template 1 from rotating, and avoid the torque that may be generated during the cone surface driving process.
[0030] Working principle of the invention: S1. Install the upper template 1 on the machine tool slider of the hydraulic press, and install the lower template 2 on the machine tool worktable of the hydraulic press; S2, the machine tool slider moves upward with the upper template 1, the upper template 1 and the lower template 2 separate, and the inner expansion module 3 and the outer expansion module 4 open; S3. The inner expansion flap 301 returns to its initial position under the action of the first spring 5, and the outer expansion flap 401 also returns to its initial position under the action of the second spring 6. S4. Place a ring-shaped or rotating part blank between the inner expansion mold 3 and the outer expansion mold 4; S5. The machine tool slider moves downward with the upper template 1. The first conical surface 101 and the second conical surface 102 contact the inner expansion flap 301 and the outer expansion flap 401 respectively, driving the inner expansion flap 301 to move outward along the first slide rail 201, and at the same time driving the outer expansion flap 401 to move inward along the second slide rail 202 until the upper template 1 and the lower template 2 are closed, realizing the expansion of the ring or rotating part.
[0031] S6. Repeat steps S2 to S5 to process the new part.
[0032] The present invention drives the inner expansion mold group 3 to expand proportionally and the outer expansion mold group 4 to contract proportionally through the first conical surface 101 and the second conical surface 102 of the upper template 1. The mold closing and forming can be completed automatically with one press. After the forming is completed, the spring drives the respective expansion petals to reset, reserving space for the next blank to be loaded. There is no need for manual pushing and pulling of the petal mold, realizing automatic expansion, contraction and reset, eliminating manual intervention.
[0033] In this invention, both the inner expansion flap 301 and the outer expansion flap 401 move along a slide rail passing through the center of the circle. They are driven by the first conical surface 101 and the second conical surface 102 to ensure strict radial synchronization and proportional deformation, eliminating the uncertainty of manual placement and greatly improving the forming accuracy and batch stability of the parts.
[0034] This invention is suitable for processing small batches of multi-specification, high-precision annular rotating shell-type parts. It can form complex geometric contours in one step, shorten the forming cycle, support continuous and rhythmic production, reduce reliance on skilled workers, lower labor costs, and significantly improve production efficiency and economic benefits.
[0035] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.
Claims
1. A rigid expansion structure for annular parts, characterized in that It includes an upper template and a lower template, with multiple inner bulging flaps and multiple outer bulging flaps slidably connected on the lower template; Multiple inner expansion flaps are combined to form an inner expansion module. The outer wall of the inner expansion module forms a first contour. The multiple inner expansion flaps slide along the lower template to make the first contour expand proportionally. Multiple external expansion flaps are combined to form an external expansion module. The inner sidewall of the external expansion module forms a second contour. The multiple external expansion flaps slide along the lower template to make the second contour shrink proportionally. The inner bulging mold is located inside the outer bulging mold. The upper template drives the inner and outer bulging molds to move towards each other, so that the inner sidewall of the outer bulging mold fits against the outer sidewall of the inner bulging mold to form the mold surface of the ring-shaped part.
2. The rigid expansion structure of the annular part according to claim 1, characterized in that... The outer side wall of the inner expansion petal has a first texture, and the inner side wall of the outer expansion petal has a second texture. After the inner side wall of the outer expansion module is attached to the outer side wall of the inner expansion module, multiple first textures combine to form a first annular surface, and multiple second textures combine to form a second annular surface. The first annular surface and the second annular surface are combined to form the mold surface of the annular part.
3. The rigid expansion structure of the annular part according to claim 1, characterized in that... Both the inner and outer expansion modules are annular. The lower template has a first slide rail, and a first slider is fixedly connected to the inner expansion petal. The first slider is slidably connected to the first slide rail so that the inner expansion petal slides along the lower template. The first slide rail is located on a straight line passing through the center of the inner expansion module. The lower template has a second slide rail, and a second slider is fixedly connected to the outer expansion petal. The second slider is slidably connected to the second slide rail so that the outer expansion petal slides along the lower template. The second slide rail is located on a straight line passing through the center of the outer expansion module.
4. The rigid expansion structure of the annular part according to claim 3, characterized in that... A first spring is fixedly connected to the first slider, and the end of the first spring away from the first slider is fixedly connected to the first slide rail. The first spring releases its elastic force to drive the inner expansion flap to reset. A second spring is fixedly connected to the second slider, and the end of the second spring away from the second slider is fixedly connected to the second slide rail. The second spring releases its elastic force to drive the outer expansion flap to reset.
5. The rigid expansion structure of the annular part according to claim 1, characterized in that... The upper template includes a first conical surface and a second conical surface. The first conical surface matches the inner sidewall of the inner expansion mold to form a conical fit. When the upper template moves downward, the first conical surface drives the inner expansion mold to slide along the lower template so that the first contour expands proportionally. The second conical surface matches the outer sidewall of the outer expansion mold to form a conical fit. When the upper template moves downward, the second conical surface drives the outer expansion mold to slide along the lower template so that the second contour contracts proportionally. The upper template drives the inner expansion mold and the outer expansion mold to move towards each other through the first and second conical surfaces.
6. The rigid expansion structure of the annular part according to claim 1, characterized in that... The lower template is fixedly connected to a guide column, and the upper template is slidably connected to the guide column to guide the upper template in the vertical direction.
7. The rigid expansion structure of the annular part according to claim 6, characterized in that... The upper template has a first through hole at its center, and the upper template is slidably connected to the guide column through the first through hole.
8. The rigid expansion structure of the annular part according to claim 7, characterized in that... A third slide rail is provided on the inner wall of the first through hole, and a third slider is fixedly connected to the guide column. The third slide rail and the third slider are slidably connected, thereby limiting the upper template in a circumferential direction.