A stripper mechanism for a blank of a stamped part
By using a nested structure of an outer rigid top column, a middle spring, and an inner silicone column, the problems of blank deformation and uneven stress caused by traditional demolding mechanisms are solved, achieving smooth and efficient demolding of stamped blanks, and improving product quality and equipment stability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- QINGDAO JIANGZI MOULD CO LTD
- Filing Date
- 2025-07-28
- Publication Date
- 2026-06-12
AI Technical Summary
Traditional stamping blank demolding mechanisms are prone to blank deformation, uneven stress, poor guidance, and problems such as mold wear and unstable equipment operation.
The device employs a nested structure consisting of an outer rigid top pillar, a middle spring, and an inner silicone pillar. The outer rigid top pillar provides stable support, the middle spring adapts to changes in stamping force, and the inner silicone pillar evenly distributes the force, working together to achieve smooth demolding.
It improves the demolding quality and reliability of stamping blanks, reduces the probability of blank deformation and damage, extends the service life of dies, and improves production efficiency and product quality.
Smart Images
Figure CN224346838U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of demolding mechanisms, specifically, it relates to a demolding mechanism for stamping blanks. Background Technology
[0002] In the field of stamping, the demolding mechanism for stamped parts is an indispensable and crucial component of stamping equipment. Its main function is to smoothly and completely separate the stamped part blank, which is attached to the die cavity or punch surface, from the die after the stamping process is completed. This ensures the smooth operation of subsequent processing steps and protects the quality of the stamped part blank from damage. The performance of the demolding mechanism directly affects the efficiency of stamping production, product quality, and the service life of the die. Therefore, the rationality and reliability of the demolding mechanism are of paramount importance in the design and manufacturing of stamping equipment.
[0003] Traditional ejection mechanisms for stamped blanks have many drawbacks. Currently, most common traditional ejection mechanisms employ a single rigid ejector pin or a simple elastic ejection structure. With a single rigid ejector pin, the contact area between the ejector pin and the stamped blank is small during ejection, easily leading to excessive localized stress on the blank. This is especially true for thin-walled or complex-shaped stamped blanks, which can easily cause deformation, warping, or even cracking, severely affecting product quality. Simultaneously, rigid ejector pins lack buffering capacity, generating significant impact on the mold and blank at the moment of ejection. Long-term use not only accelerates mold wear and shortens mold life but may also cause equipment instability due to impact vibration. While simple elastic ejection structures offer some buffering capacity, they typically rely on a single spring for elastic ejection. The spring force is difficult to adjust flexibly according to the shape and pressure of the stamped blank. When dealing with stamped blanks of different thicknesses and shapes, the ejection force is either insufficient, leading to ejection difficulties, or excessive force, still posing a risk of blank deformation. Furthermore, the elastic components in traditional elastic ejection structures are prone to elasticity decay over long-term use, leading to unstable ejection results and requiring frequent replacement of the elastic components, increasing equipment maintenance costs and downtime. Moreover, traditional demolding mechanisms have poor guiding performance, and the ejector pin is prone to offset or misalignment during ejection, resulting in inaccurate demolding positions and further affecting the quality of the stamped blanks and production efficiency. Utility Model Content
[0004] In view of this, the present invention provides a demolding mechanism for stamping blanks, which solves the problem that traditional demolding mechanisms for stamping blanks are prone to deformation and uneven force distribution during ejection, resulting in poor guidance.
[0005] This utility model is implemented as follows:
[0006] This utility model provides a demolding mechanism for stamped part blanks, comprising: an outer rigid top post, a middle spring, and an inner silicone column; the outer rigid top post is a hollow columnar structure with a planar contact portion at its top for contacting the stamped part blank; the middle spring is nested in the inner cavity of the outer rigid top post, with its top end abutting against the top of the inner cavity of the outer rigid top post, and its bottom end extending to the outside of the outer rigid top post; the inner silicone column is a solid columnar structure nested inside the middle spring, with its top end extending beyond the top of the middle spring and flush with the planar contact portion of the outer rigid top post, and its bottom end connected to the bottom end of the middle spring.
[0007] The technical advantages of the demolding mechanism for stamped part blanks provided by this utility model are as follows: Through the nested structure of an outer rigid ejector column, a middle spring, and an inner silicone column, the outer rigid ejector column provides stable support to ensure ejection force; the elastic expansion and contraction of the middle spring can adapt to changes in stamping pressure; and the inner silicone column can fully contact the surface of the blank to avoid excessive local stress. The synergistic effect of these three components achieves smooth demolding of the stamped part blank, effectively solving the problem of blank deformation easily caused by traditional ejection mechanisms, and improving demolding quality and reliability.
[0008] Based on the above technical solution, the demolding mechanism for stamping blanks of this utility model can be further improved as follows:
[0009] The outer rigid top column has a rounded corner transition structure at the edge of its planar contact portion.
[0010] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the rounded corner transition structure of the outer rigid top column plane contact part can avoid scratching the surface of the blank due to the sharp edge corner when in contact with the stamping blank, thus protecting the appearance quality of the blank and reducing subsequent repair processes.
[0011] Furthermore, the inner wall of the outer rigid top column is provided with several guide protrusions along the axial direction, and the outer wall of the middle spring is provided with guide grooves that are adapted to the guide protrusions, with the guide protrusions embedded in the guide grooves.
[0012] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the guide protrusion on the inner wall of the outer rigid top column cooperates with the guide groove on the outer wall of the middle spring to provide precise guidance for the extension and retraction of the middle spring, prevent the middle spring from shifting or tilting during the extension and retraction process, ensure the accuracy of the ejection direction, and ensure the precision of the demolding position.
[0013] Furthermore, the top of the inner silicone pillar is provided with an arc-shaped protrusion, and the highest point of the arc-shaped protrusion is flush with the plane contact part of the outer rigid top pillar.
[0014] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the arc-shaped protrusion at the top of the inner silicone pillar is flush with the contact part of the outer rigid top pillar. The arc-shaped structure can better fit the surface of the curved stamping blank, increase the contact area and disperse the ejection force, further avoid local stress concentration on the blank, and improve the adaptability to irregular blanks and the smoothness of demolding.
[0015] Furthermore, it also includes a base, with the bottom end of the outer rigid top column being movably connected to the base, and the bottom end of the middle spring being fixedly connected to the base.
[0016] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the base provides stable support for the entire mechanism, the outer rigid top column is movably connected to the base to facilitate the ejection action, and the middle spring is fixedly connected to the base to ensure the stability of the spring extension and contraction, making the overall structure of the mechanism more stable and improving the reliability of long-term use.
[0017] Furthermore, the base is provided with a positioning groove, and the bottom end of the outer rigid top column is embedded in the positioning groove and can slide along the axial direction of the positioning groove.
[0018] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the positioning groove on the base plays a limiting and guiding role on the bottom end of the outer rigid ejector, ensuring that the outer rigid ejector will not be radially offset during axial sliding, further ensuring the accuracy and stability of the ejection action, and reducing the impact of mechanism shaking on the demolding effect.
[0019] Furthermore, the wire diameter of the middle spring gradually increases from the top to the bottom, forming a conical spring structure.
[0020] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the middle layer spring adopts a tapered spring structure with the wire diameter gradually increasing from the top to the bottom, which makes the spring more elastic at the top when subjected to force and can quickly respond to slight pressure changes. The larger wire diameter at the bottom provides stronger support, thus improving the overall load-bearing capacity and elastic performance of the spring and adapting to the needs of different stamping conditions.
[0021] Furthermore, the outer wall of the inner silicone pillar is provided with annular anti-slip ridges, which are in contact with the inner wall of the middle spring.
[0022] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the annular anti-slip ridges on the outer wall of the inner silicone column fit into the inner wall of the middle spring, increasing the friction between the two, preventing the inner silicone column from sliding relative to the middle spring, ensuring the synchronicity of the movement of the inner silicone column and the middle spring, and ensuring that the ejection force is effectively transmitted to the stamping blank.
[0023] Furthermore, the outer wall of the outer rigid top column is provided with axially extending scale marking lines.
[0024] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the axial scale marking line on the outer wall of the outer rigid top column can intuitively display the amount of expansion and contraction of the outer rigid top column, making it convenient for operators to observe and adjust the ejection height, and accurately control the ejection stroke according to the stamping blanks of different thicknesses, thereby improving the convenience and accuracy of operation.
[0025] Furthermore, the bottom end of the inner silicone pillar is provided with a metal connecting piece, which is fixedly connected to the bottom end of the middle spring by welding.
[0026] The metal connecting piece is made of stainless steel.
[0027] Compared with the prior art, the beneficial effects of the demolding mechanism for stamping blanks provided by this utility model are:
[0028] This invention's double-elastic-layer nested ejection mechanism offers significant advantages over traditional demolding mechanisms. From an overall performance perspective, this mechanism, through its scientifically designed structure, achieves smooth and efficient demolding of the stamped part blank, effectively solving many problems inherent in traditional mechanisms. The synergistic effect of the outer rigid ejector pillar, the middle spring, and the inner silicone pillar ensures sufficient ejection force while providing flexible protection for the stamped part blank, significantly reducing the probability of blank deformation and damage, and substantially improving the quality stability of the stamped products.
[0029] In terms of structural details, the optimized design of each component brings multiple advantages. The rounded corner transition structure of the outer rigid ejector pin's flat contact area avoids scratches on the blank surface, protecting the product's appearance quality. The cooperation between the guide ridge and the guide groove ensures the accuracy of the ejection direction, reducing demolding position deviation caused by ejector pin offset. The arc-shaped protrusion at the top of the inner silicone pillar enhances adaptability to irregularly shaped blanks, achieving good fit and uniform force distribution regardless of whether the blank surface is flat or curved. The base and positioning groove improve the overall stability of the mechanism and extend the service life of the equipment. Stainless steel metal connecting plates ensure the robustness of the connection parts, reducing the probability of mechanism failure. The scale markings provide operators with intuitive adjustment guidelines, improving operational convenience. Attached Figure Description
[0030] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0031] Figure 1 This is an example diagram of a demolding mechanism for stamping blanks;
[0032] Figure 2 A cross-sectional view of a demolding mechanism for stamped part blanks;
[0033] The attached diagram lists the components represented by each number as follows:
[0034] 10. Outer rigid top column; 11. Guide ridge; 12. Base; 20. Middle spring; 30. Inner silicone column; 31. Metal connecting piece. Detailed Implementation
[0035] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.
[0036] like Figure 1 , Figure 2 The diagram shows an example of a demolding mechanism for a stamped part blank provided by this utility model: it includes an outer rigid top post 10, a middle spring 20, and an inner silicone pillar 30; the outer rigid top post 10 is a hollow columnar structure with a planar contact portion at its top for contacting the stamped part blank; the middle spring 20 is nested in the inner cavity of the outer rigid top post 10, with its top end abutting against the top of the inner cavity of the outer rigid top post 10, and its bottom end extending to the outside of the outer rigid top post 10; the inner silicone pillar 30 is a solid columnar structure, nested inside the middle spring 20, with its top end extending out of the top of the middle spring 20 and flush with the planar contact portion of the outer rigid top post 10, and its bottom end connected to the bottom end of the middle spring 20.
[0037] When in use, install the double elastic layer nested ejection mechanism at the designated position on the stamping equipment, ensuring that the base is firmly fixed and that the outer rigid top column, the middle spring, and the inner silicone column are in a normal nested state. Adjust the initial position of the mechanism according to the thickness of the stamping blank by using the scale markings on the outer side of the outer rigid top column.
[0038] When the stamping equipment starts working, the upper die moves downward to stamp and form the blank. During this process, the stamped blank exerts pressure on the ejection mechanism. The outer rigid ejector is forced to compress the middle spring, and the inner silicone column is also compressed. During the compression process, the guide groove on the outer wall of the middle spring slides along the guide protrusion on the inner wall of the outer rigid ejector.
[0039] After stamping, the upper die returns to its original position, and the middle spring begins to extend under the action of the rebound force, driving the outer rigid ejector pins upward. At the same time, the inner silicone ejector pins also move upward under their own elasticity and the action of the middle spring. The planar contact part of the outer rigid ejector pins and the top of the inner silicone ejector pins work together on the stamped blank, and the arc-shaped protrusion of the inner silicone ejector pins fits against the surface of the blank, smoothly ejecting the blank from the die.
[0040] After demolding is completed, the mechanism returns to its initial state under its own structural action before the start of the next stamping cycle, waiting for the next stamping demolding operation.
[0041] In the above technical solution, the edge of the planar contact portion of the outer rigid top column 10 is provided with a rounded corner transition structure.
[0042] Furthermore, in the above technical solution, the inner wall of the outer rigid top column 10 is provided with several guide protrusions 11 along the axial direction, and the outer wall of the middle spring 20 is provided with guide grooves that are adapted to the guide protrusions 11, and the guide protrusions 11 are embedded in the guide grooves.
[0043] Furthermore, in the above technical solution, the top of the inner silicone pillar 30 is provided with an arc-shaped protrusion, and the highest point of the arc-shaped protrusion is flush with the plane contact part of the outer rigid top pillar 10.
[0044] Furthermore, the above technical solution also includes a base 12, with the bottom end of the outer rigid top column 10 movably connected to the base 12, and the bottom end of the middle spring 20 fixedly connected to the base 12.
[0045] Furthermore, in the above technical solution, the base 12 is provided with a positioning groove, and the bottom end of the outer rigid top column 10 is embedded in the positioning groove and can slide along the axial direction of the positioning groove.
[0046] Furthermore, in the above technical solution, the wire diameter of the middle spring 20 gradually increases from the top to the bottom, forming a conical spring structure.
[0047] Furthermore, in the above technical solution, the outer wall of the inner silicone pillar 30 is provided with annular anti-slip ridges, which are in contact with the inner wall of the middle spring 20.
[0048] Furthermore, in the above technical solution, the outer wall of the outer rigid top column 10 is provided with a scale marking line extending along the axial direction.
[0049] Furthermore, in the above technical solution, the bottom end of the inner silicone pillar 30 is provided with a metal connecting piece 31, and the metal connecting piece 31 is fixedly connected to the bottom end of the middle spring 20 by welding.
[0050] Example 1:
[0051] The double-elastic-layer nested ejection mechanism of this embodiment includes an outer rigid top column, a middle spring, an inner silicone column, and a base. The outer rigid top column is a hollow columnar structure with a flat contact portion at the top and rounded corners at the edges. Three guide ridges are axially arranged on its inner wall. The middle spring is a cylindrical spring with uniform wire diameter. Its outer wall has guide grooves that fit the guide ridges. It is nested inside the cavity of the outer rigid top column, with its top abutting against the inner top of the outer rigid top column and its bottom extending to the outside. The inner silicone column is a solid columnar structure with an arc-shaped protrusion at the top that is flush with the flat contact portion. Its outer wall has annular anti-slip textures, and its bottom is welded to the bottom of the middle spring via a stainless steel connecting piece. The base has a positioning groove, into which the bottom of the outer rigid top column is embedded and can slide axially. The bottom of the middle spring is fixedly connected to the base.
[0052] It is suitable for demolding flat or shallow-drawn stamping blanks with relatively uniform thickness, such as flat small parts in automotive body panels and shallow-drawn blanks for electrical appliance housings.
[0053] The rounded corners of the outer rigid top pillars prevent scratching the surface of the blank; the guide ridges and grooves work together to ensure accurate ejection direction and prevent spring misalignment; the arc-shaped protrusions and annular anti-slip textures of the inner silicone pillars enhance the fit and synchronization with the blank, and together with the elasticity of the uniform springs in the middle layer, they enable smooth demolding of flat and shallowly stretched blanks, effectively preventing deformation, improving demolding quality and efficiency, and providing strong structural stability, making it less prone to component loosening during long-term use.
[0054] Example 2:
[0055] This embodiment includes an outer rigid top column, a middle spring, an inner silicone column, and a base. The outer rigid top column is a hollow column with rounded corners at the edge of its top surface contact portion, and axial scale markings on its outer wall. The middle spring is a tapered spring with a wire diameter that gradually increases from top to bottom, nested inside the outer rigid top column, with its top end abutting against the top of the outer layer and its bottom end extending to the outside. The inner silicone column is a solid column with a flat top that is flush with the outer layer's surface contact portion, and its bottom end welded to the bottom end of the middle spring via a stainless steel connecting piece. The base has a positioning groove, into which the bottom end of the outer rigid top column slides, while the bottom end of the middle spring is fixed to the base.
[0056] It is suitable for demolding irregularly shaped stamping blanks with uneven thickness or local protrusions, such as irregularly shaped bracket blanks in mechanical parts, stamping parts with reinforcing ribs, etc.
[0057] The tapered middle spring features a small-diameter top for sensitive elasticity and a large-diameter bottom for strong support, adapting to the stress requirements of different parts of irregularly shaped blanks. The outer layer's graduated markings allow operators to precisely adjust the ejection height based on the blank's thickness. The inner silicone pillar's flat top mates with the outer layer, allowing for adaptive force distribution to protruding areas during ejection of irregularly shaped blanks, preventing localized stress concentration. The overall structure, through the tapered spring's gradual elasticity and precise height adjustment, achieves stable demolding of irregularly shaped stamped blanks, reducing demolding difficulties caused by complex shapes and improving adaptability to irregularly shaped parts.
[0058] Specifically, the principle of this utility model is as follows:
[0059] The technical principle of this utility model is based on fundamental theories such as elasticity and the synergistic effect of mechanical structures. It achieves efficient demolding through the structural characteristics and mutual cooperation of each component. The outer rigid top column is made of high-strength rigid material. Its main function is to provide a stable support frame and basic ejection force. Its rigidity ensures that it will not bend or deform during the ejection process, providing a reliable structural foundation for the entire ejection action.
[0060] The middle spring, as the core component for elastic adjustment, utilizes the elastic deformation characteristics of springs to store and release force. During the stamping process, when the stamped part blank exerts pressure on the ejection mechanism, the middle spring is compressed, converting the pressure into stored elastic potential energy. After stamping is completed, the spring releases the stored elastic potential energy, generating a rebound force that pushes the outer rigid ejector and the inner silicone ejector upwards, achieving the ejection action. Its elastic expansion and contraction characteristics can automatically adjust the degree of deformation according to the magnitude of the stamping pressure, making the ejection force compatible with the stamping pressure and avoiding the problem of excessive impact force from rigid ejection.
[0061] The inner silicone pillars are made of highly elastic and flexible silicone material, utilizing the elastic deformation and surface friction properties of silicone. During ejection, the silicone pillars can fully contact the surface of the stamping blank, adapting to the shape of the blank surface through their elastic deformation, and evenly distributing the ejection force across the blank surface to prevent localized stress concentration. Simultaneously, the flexibility of the silicone material reduces hard contact with the blank surface, minimizing the risk of damage to the blank.
[0062] The nested structure of the components is key to achieving coordinated operation. The outer rigid top pillar provides installation space and motion guidance for the middle spring and inner silicone pillar. The extension and contraction of the middle spring transmits force through its coordination with the guiding action of the outer rigid top pillar. The inner silicone pillar, driven by the middle spring and its own elasticity, works together with the outer rigid top pillar to press against the blank. The base and positioning structure provide stable support and motion constraints for the entire mechanism, ensuring precise movement trajectories of each component, thereby achieving a smooth and efficient demolding process.
Claims
1. A demolding mechanism for stamped part blanks, characterized in that: It includes an outer rigid top post, a middle spring, and an inner silicone pillar; the outer rigid top post is a hollow columnar structure with a planar contact portion at its top for contacting the stamping blank; the middle spring is nested in the inner cavity of the outer rigid top post, with its top end abutting against the top of the inner cavity of the outer rigid top post and its bottom end extending to the outside of the outer rigid top post; the inner silicone pillar is a solid columnar structure nested inside the middle spring, with its top end extending beyond the top of the middle spring and flush with the planar contact portion of the outer rigid top post, and its bottom end connected to the bottom end of the middle spring.
2. The demolding mechanism for a stamped part blank according to claim 1, characterized in that, The outer rigid top column has a rounded corner transition structure at the edge of its planar contact portion.
3. A demolding mechanism for stamped part blanks according to claim 2, characterized in that, The inner wall of the outer rigid top column is provided with several guide ridges along the axial direction, and the outer wall of the middle spring is provided with guide grooves that are adapted to the guide ridges, with the guide ridges embedded in the guide grooves.
4. A demolding mechanism for a stamped part blank according to claim 3, characterized in that, The top of the inner silicone pillar is provided with an arc-shaped protrusion, and the highest point of the arc-shaped protrusion is flush with the plane contact part of the outer rigid top pillar.
5. A demolding mechanism for a stamped part blank according to claim 4, characterized in that, It also includes a base, with the bottom end of the outer rigid top column being movably connected to the base, and the bottom end of the middle spring being fixedly connected to the base.
6. A demolding mechanism for a stamped part blank according to claim 5, characterized in that, The base is provided with a positioning groove, and the bottom end of the outer rigid top column is embedded in the positioning groove and can slide along the axial direction of the positioning groove.
7. A demolding mechanism for a stamped part blank according to claim 6, characterized in that, The wire diameter of the middle layer spring gradually increases from the top to the bottom, forming a conical spring structure.
8. A demolding mechanism for a stamped part blank according to claim 7, characterized in that, The outer wall of the inner silicone pillar is provided with annular anti-slip ridges, which are in contact with the inner wall of the middle spring.
9. A demolding mechanism for a stamped part blank according to claim 8, characterized in that, The outer rigid top column has axially extending scale markings on its outer side wall.
10. A demolding mechanism for a stamped part blank according to claim 9, characterized in that, The bottom end of the inner silicone pillar is provided with a metal connecting piece, which is fixedly connected to the bottom end of the middle spring by welding.