Rapid molding device for injection mold

Abstract

The utility model discloses an injection mold rapid forming device which comprises a base, a transverse rod is arranged at the position, close to the bottom, in the base, a motor is fixedly installed at the position, close to the center, of the bottom in the base, a second gear is fixedly installed in the center of the surface of the transverse rod, and the bottom of the second gear is connected with a first gear in a meshed mode. According to the rapid molding device for the injection mold, through the design of a transverse rod, a motor, a first gear, a second gear, cams, rolling grooves, a transverse plate, balls, a sleeve, an ejector rod, a first spring and a second spring, the motor drives the first gear to be in meshing transmission to drive the transverse rod to rotate synchronously, so that the rolling grooves in the outer walls of the cams on the two sides are in rolling contact with the balls at the bottom of the transverse plate; when the transverse plate ascends, the ejector rod in the sleeve firstly makes flexible contact with a product in the lower die through the pre-tightening force of the first spring, initial impact force is effectively absorbed, and ejection marks or deformation caused by rigid collision is avoided.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, specifically to a rapid prototyping device for injection molds. Background Technology

[0002] Injection molds are specialized tools used for the mass production of plastic products. They can transform plastic raw materials into finished products with specific shapes, sizes, and surface qualities. Through a precisely designed cavity structure, they can directly mold complex three-dimensional geometric shapes, supporting the large-scale production of various plastic products, from simple daily necessities to precision electronic components, automotive parts, and even medical devices. Their core function is to achieve efficient molding and replication of plastic materials, ensuring that products have consistent appearance precision and mechanical properties. At the same time, through modular design, they can be flexibly adapted to different material properties and production needs. They are a key technological carrier for achieving standardization and low-cost mass production of plastic products in modern industry.

[0003] Existing rapid prototyping devices for injection molds have significant shortcomings in the demolding process. They generally lack an effective buffering mechanism, and the ejector pins make direct, rigid contact with the product. This hard impact easily leaves defects such as white spots and dents on the product surface, affecting the appearance quality. For products with fragile structures or thin walls, it may also directly lead to deformation, cracking, or even breakage, resulting in a significant increase in the defect rate. At the same time, the lack of buffering transition of the impact force of the ejector pins will also accelerate the wear of the mold ejection system, shorten the service life of the equipment, increase maintenance costs, and seriously restrict the improvement of production efficiency and product yield. Therefore, we propose a rapid prototyping device for injection molds. Utility Model Content

[0004] The purpose of this invention is to provide a rapid prototyping device for injection molds, addressing the significant shortcomings of existing rapid prototyping devices in the demolding process, as mentioned in the background. These devices generally lack an effective buffering mechanism, resulting in direct rigid contact between the ejector pin and the product. This hard impact easily leaves defects such as white spots and dents on the product surface, affecting appearance quality. For products with fragile structures or thin walls, it can also directly lead to deformation, cracking, or even breakage, causing a significant increase in the defect rate. At the same time, the lack of buffering transition in the impact force of the ejector pin accelerates the wear of the mold ejection system, shortens the equipment's service life, increases maintenance costs, and seriously restricts the improvement of production efficiency and product yield.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a rapid prototyping device for injection molds, comprising a base, a crossbar located near the bottom of the base, a motor fixedly installed near the center of the bottom of the base, a second gear fixedly installed at the center of the surface of the crossbar, a first gear meshing with the bottom of the second gear, cams fixedly connected to both sides of the surface of the crossbar, and rolling grooves formed on the outer walls of both cams, a cross plate located near the center of the base, ball seats fixedly connected to both sides of the bottom of the cross plate, with rolling balls rotatably installed at the lower end of the ball seats, sleeves fixedly connected to both sides of the top of the cross plate, a first spring fixedly connected to the inner bottom of the sleeve, a push rod fixedly connected to the top of the first spring, a lower mold fixedly installed at the center of the top of the base, a connecting plate fixedly connected to the top of the outer wall of the sleeve, four second springs fixedly connected to the top of the connecting plate, and the tops of the four second springs on both sides fixedly connected to the inner top of the base.

[0006] Compared with the prior art, the beneficial effects of this utility model are:

[0007] This rapid prototyping device for injection molds utilizes a design incorporating a crossbar, motor, gear 1, gear 2, cam, rolling groove, cross plate, ball bearings, sleeve, ejector pin, and springs 1 and 2. The motor drives gear 1 to rotate the crossbar synchronously, causing the rolling grooves on the outer walls of the cams on both sides to make rolling contact with the ball bearings at the bottom of the cross plate. This converts the rotational motion into the smooth vertical lifting and lowering of the cross plate. When the cross plate rises, the ejector pin inside the sleeve first makes flexible contact with the product in the lower mold through the preload of spring 1, effectively absorbing the initial impact force and preventing whitening or deformation caused by rigid collisions. Subsequently, the four springs 2 at the top of the connecting plate act as a secondary buffer structure, further attenuating residual impact energy during ejection, ensuring uniform stress and stable surface quality of the product. This multi-level buffer protection during demolding improves product yield and achieves efficient, low-damage rapid demolding. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the structure of this utility model;

[0009] Figure 2 This is a top view of the horizontal plate structure of this utility model;

[0010] Figure 3 This is a three-dimensional structural view of the top rod of this utility model;

[0011] Figure 4 This is the main view of the structure of this utility model.

[0012] In the diagram: 1. Base; 2. Crossbar; 3. Motor; 4. Gear No. 1; 5. Gear No. 2; 6. Cam; 7. Rolling groove; 8. Horizontal plate; 9. Ball seat; 10. Ball; 11. Slide rod; 12. Sleeve; 13. Push rod; 14. Lower mold; 15. Spring No. 1; 16. Connecting plate; 17. Spring No. 2. Detailed Implementation

[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0014] Please see Figure 1-4 This utility model provides a technical solution: a rapid prototyping device for injection molds, including a base 1, a crossbar 2 arranged near the bottom of the base 1, a motor 3 fixedly installed near the center of the bottom of the base 1, a second gear 5 fixedly installed at the center of the surface of the crossbar 2, a first gear 4 meshing with the bottom of the second gear 5, cams 6 fixedly connected to both sides of the surface of the crossbar 2, and rolling grooves 7 formed on the outer walls of both cams 6, and a cross plate 8 arranged near the center of the base 1, with rolling grooves 7 formed on both sides of the bottom of the cross plate 8. A ball seat 9 is fixedly connected, and a ball bearing 10 is rolledly installed at the lower end of the ball seat 9. Sleeves 12 are fixedly connected to both sides of the top of the horizontal plate 8. A first spring 15 is fixedly connected to the inner bottom of the sleeve 12. A push rod 13 is fixedly connected to the top of the first spring 15. A lower mold 14 is fixedly installed at the center of the top of the base 1. A connecting plate 16 is fixedly connected to the top of the outer wall of the sleeve 12. Four second springs 17 are fixedly connected to the top of the connecting plate 16. The tops of the four second springs 17 on both sides are fixedly connected to the inner top of the base 1.

[0015] Both ends of the crossbar 2 are movably connected to bearings fixedly installed on both sides of the base 1 near the bottom. The motor 3 is fixedly connected to an output shaft through its output end on one side. The side of the output shaft away from the motor 3 is fixedly connected to the center of the first gear 4, so that the motor 3 can drive the first gear 4 to rotate through the output shaft, thereby driving the crossbar 2 to rotate stably under the support of the bearing. This achieves efficient power transmission from the motor 3 to the crossbar 2, providing a power basis for the subsequent rotation of the cam 6 and ensuring the precise start of the demolding action.

[0016] The lower ends of the two balls 10 penetrate into the interior of the two rolling grooves 7 and contact the inner wall of the rolling grooves 7. Through the rolling contact between the balls 10 and the rolling grooves 7, the rotational motion of the crossbar 2 is converted into the vertical lifting motion of the cross plate 8. At the same time, rolling friction is used to reduce motion resistance, reduce wear and improve the smoothness of the action, and avoid the jamming or shaking problems caused by traditional sliding friction.

[0017] Four slide rods 11 are fixedly connected to the inner top of the base 1. The lower ends of the four slide rods 11 extend to the outside of the horizontal plate 8. Limiting blocks are fixedly connected to the bottom of the four slide rods 11. The tops of the four limiting blocks are in contact with the bottom of the horizontal plate 8. The cooperation between the slide rods 11 and the limiting blocks can precisely constrain the movement trajectory of the horizontal plate 8, prevent it from shifting or tilting during the lifting process, ensure the precise alignment of the top rod 13 and the groove of the lower mold 14, and at the same time, the limiting blocks can prevent the horizontal plate 8 from rising excessively and causing damage to the equipment, thus improving the overall operational stability.

[0018] The bottom of the lower mold 14 has grooves on both sides. The top of the ejector rod 13 passes through the interior of the base 1 and the receiving groove in sequence. The groove at the bottom of the lower mold 14 provides a precise positioning space for the ejector rod 13, ensuring that the ejector rod 13 can be accurately aligned with the bottom of the product during the ejection process, avoiding ejection failure or product damage due to position deviation. At the same time, the receiving groove can assist the vertical movement of the ejector rod 13 and reduce frictional resistance.

[0019] A fixed frame is fixedly installed on the top of the base 1. A cylinder is fixedly installed at the center of the top of the fixed frame. A piston rod is fixedly connected to the cylinder through its bottom output end. The bottom of the piston rod extends through the outside of the fixed frame and is fixedly connected to the upper mold. The fixed frame provides a stable support structure for the cylinder. The cylinder drives the upper mold through the piston rod to realize the mold opening and closing action, and cooperates with the lower mold 14 to complete the injection molding process. At the same time, the lifting speed and pressure of the upper mold can be adjusted by the cylinder to adapt to the molding needs of different products and improve production flexibility.

[0020] A cover plate is fixedly connected to the center of the front surface of the base 1 by screws. The front surface of the cover plate has a heat dissipation groove corresponding to the front end of the motor 3. Opening the cover plate makes it easy to maintain the internal components of the base 1.

[0021] After the product is injection molded, the motor 3 starts, and its output shaft drives the first gear 4 to rotate. Through the meshing transmission with the second gear 5, the crossbar 2 is driven to rotate stably under the support of the bearings on both sides of the base 1. The cams 6 on both sides of the crossbar 2 rotate accordingly, and the rolling groove 7 on its outer wall forms rolling contact with the ball bearings 10 in the ball seat 9 at the bottom of the crossbar 8, converting the rotational motion into the vertical lifting motion of the crossbar 8. When the crossbar 8 rises, the ejector rod 13 in the sleeve 12 flexibly contacts the product in the lower mold 14 under the preload of the first spring 15. Subsequently, the four second springs 17 on the top of the connecting plate 16 act as a secondary buffer structure to further attenuate the impact force, ensuring that the ejector rod 13 smoothly ejects the product. The groove at the bottom of the lower mold 14 provides precise positioning for the ejector rod 13 to avoid ejection deviation. The lifting trajectory of the crossbar 8 is constrained by four slide rods 11, and the limit block prevents it from rising excessively, improving the stability of the movement.

[0022] In summary, this rapid prototyping device for injection molds, through the design of a crossbar 2, motor 3, first gear 4, second gear 5, cam 6, rolling groove 7, cross plate 8, ball bearings 10, sleeve 12, ejector rod 13, first spring 15, and second spring 17, uses the motor 3 to drive the first gear 4 to mesh and drive the crossbar 2 to rotate synchronously. This causes the rolling groove 7 on the outer wall of the cam 6 on both sides to form rolling contact with the ball bearings 10 at the bottom of the cross plate 8, converting the rotational motion into the smooth vertical lifting and lowering of the cross plate 8. When the cross plate 8 rises, the ejector rod 13 inside the sleeve 12 first makes flexible contact with the product in the lower mold 14 through the preload of the first spring 15, effectively absorbing the initial impact force and avoiding whitening or deformation caused by rigid collision. Subsequently, the four second springs 17 on the top of the connecting plate 16 act as a secondary buffer structure, further attenuating the residual impact energy during the ejection process of the ejector rod 13, ensuring uniform stress on the product and stable surface quality. This achieves multi-level buffer protection during the demolding process, improves product yield, and realizes efficient and low-damage rapid demolding and molding.

[0023] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0024] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A rapid prototyping device for injection molds, comprising a base (1), characterized in that: A crossbar (2) is provided at the bottom of the base (1). A motor (3) is fixedly installed at the center of the bottom of the base (1). A second gear (5) is fixedly installed at the center of the surface of the crossbar (2). A first gear (4) is meshed with the bottom of the second gear (5). Cams (6) are fixedly connected to both sides of the surface of the crossbar (2). Rolling grooves (7) are opened on the outer walls of the two cams (6). A cross plate (8) is provided at the center of the base (1). A ball seat (9) is fixedly connected to both sides of the bottom of the cross plate (8). A ball bearing (10) is rolled at the lower end. Sleeves (12) are fixedly connected to the top of the horizontal plate (8) on both sides. A first spring (15) is fixedly connected to the inner bottom of the sleeve (12). A top rod (13) is fixedly connected to the top of the first spring (15). A lower mold (14) is fixedly installed at the center of the top of the base (1). A connecting plate (16) is fixedly connected to the top of the outer wall of the sleeve (12). Four second springs (17) are fixedly connected to the top of the connecting plate (16). The tops of the four second springs (17) on both sides are fixedly connected to the inner top of the base (1).

2. The rapid prototyping device for injection molds according to claim 1, characterized in that: The two ends of the crossbar (2) are respectively connected to the bearings fixedly installed on both sides of the base (1) near the bottom. The motor (3) is fixedly connected to the output shaft through the output end on one side. The side of the output shaft away from the motor (3) is fixedly connected to the center of the side of the first gear (4).

3. The rapid prototyping device for injection molds according to claim 1, characterized in that: The lower ends of the two balls (10) penetrate into the interior of the two rolling grooves (7) and contact the inner wall of the rolling grooves (7).

4. The rapid prototyping device for injection molds according to claim 1, characterized in that: Four sliding rods (11) are fixedly connected to the inner top of the base (1). The lower ends of the four sliding rods (11) all extend to the outside of the horizontal plate (8). Limiting blocks are fixedly connected to the bottom of the four sliding rods (11). The tops of the four limiting blocks are in contact with the bottom of the horizontal plate (8).

5. The rapid prototyping device for injection molds according to claim 1, characterized in that: The bottom of the lower mold (14) has grooves on both sides, and the top of the top rod (13) passes through the interior of the base (1) and the receiving groove in sequence.

6. The rapid prototyping device for injection molds according to claim 1, characterized in that: A fixed frame is fixedly installed on the top of the base (1), and a cylinder is fixedly installed at the center of the top of the fixed frame. A piston rod is fixedly connected to the cylinder through its bottom output end. The bottom of the piston rod extends through to the outside of the fixed frame and is fixedly connected to the upper mold.

7. The rapid prototyping device for injection molds according to claim 1, characterized in that: The center of the front surface of the base (1) is fixedly connected to a cover plate by screws, and the front surface of the cover plate is provided with a heat dissipation groove corresponding to the front end of the motor (3).

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