Uniform stress extrusion forming die

Abstract

The utility model discloses a uniform stress extrusion forming die, and relates to the technical field of extrusion forming dies, the uniform stress extrusion forming die comprises a forming mechanism, the forming mechanism comprises a lower die, the top of the lower die is provided with a cavity, a second ejection mechanism is assembled in the cavity, the lower die is internally provided with a cavity, and the cavity is provided with a first ejection mechanism and a second ejection mechanism. A first ejection mechanism is assembled and connected in the cavity and comprises an adjusting rotating plate, a wedge-shaped sliding block, a double-shaft motor, a stepped annular groove, an annular ejection plate and an ejection rod, the double-shaft motor is fixedly connected to the top of an inner cavity of the cavity, and a lower output shaft of the double-shaft motor is fixedly connected with the middle end of the top of the adjusting rotating plate. According to the utility model, the first ejection mechanism and the second ejection mechanism are simultaneously driven by the double-shaft motor, so that a product is uniformly stressed and is ejected and demoulded, and air is supplemented between the product and the cavity, so that the demoulding process is smoother and more reliable.

Description

Technical Field

[0001] This utility model relates to the field of extrusion molding die technology, specifically to a uniformly stressed extrusion molding die. Background Technology

[0002] In modern industrial production, extrusion molding dies are widely used in the manufacturing of parts in fields such as plastics, ceramics, and powder metallurgy. After the molding process is completed, how to smoothly and completely eject the finished product from the mold cavity is a key step. Traditional ejection mechanisms mostly use structures such as ejector pins and ejector plates, driven by a single ejection force. However, these traditional ejection methods have obvious defects: First, for ring-shaped, cylindrical, or complex products, a single ejection force point or ejection path can easily lead to uneven force on the product, resulting in product deformation, warping, or even cracking. Second, during the ejection process, a large vacuum suction force or frictional resistance can easily be generated between the product and the cavity wall, leading to ejection difficulties and jamming. This not only affects production efficiency but may also damage the mold and product surface. Therefore, we propose a uniformly stressed extrusion molding die. Utility Model Content

[0003] The purpose of this invention is to provide a uniformly stressed extrusion molding die to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a uniformly stressed extrusion molding die, comprising a molding mechanism, wherein the molding mechanism includes a lower die, and the top of the lower die has a cavity, wherein a second ejection mechanism is assembled within the cavity, and the interior of the lower die has a hollow cavity, wherein a first ejection mechanism is assembled and connected within the hollow cavity, and the first ejection mechanism includes an adjusting rotating plate, a wedge-shaped slider, a dual-axis motor, a stepped annular groove, an annular ejection plate, and an ejection rod, wherein the dual-axis motor is fixedly connected to the top of the hollow cavity. Furthermore, the lower output shaft of the dual-axis motor is fixedly connected to the middle end of the top of the adjusting plate. The adjusting plate is windmill-shaped, and the surface of the adjusting plate contacts the inner side of the wedge-shaped slider. A groove is provided at the connection between the lower mold and the wedge-shaped slider. A stepped annular groove is provided at the bottom of the cavity. An annular ejector plate is set in the stepped annular groove. The upper end of the ejector rod is fixedly connected to the bottom of the annular ejector plate. The lower end of the ejector rod passes through the lower mold and is slidably assembled on the inclined surface of the wedge-shaped slider. The second ejection mechanism is assembled on the top of the upper output shaft of the dual-axis motor.

[0005] Preferably, the second ejection mechanism includes a threaded groove, an auxiliary ejection plate, and a threaded block. The threaded groove is opened at the bottom of the cavity, and the threaded block is threadedly connected to the inside of the threaded groove. A slot is opened at the middle of the top of the threaded block, and a rod is inserted into the inner surface of the slot. The rod is fixedly connected to the middle of the bottom of the auxiliary ejection plate. Both the threaded block and the threaded groove are stepped structures.

[0006] Preferably, the threaded groove has a chamfer, and the outer wall of the auxiliary ejector plate is integrally formed with a conical protrusion corresponding to the chamfer. The diameter of the bottom of the auxiliary ejector plate and the diameter of the top of the threaded block are both smaller than the diameter of the top of the threaded groove.

[0007] Preferably, a spring is fixedly connected to the upper end of the inner side of the wedge-shaped slider, and a column is rotatably connected to the end of the spring, and the column is fixedly connected to the top of the adjusting plate.

[0008] Preferably, the bottom of the ejector rod is parallel to the inclined surface of the top of the wedge-shaped slider, and a plurality of equally spaced balls are embedded in the bottom of the ejector rod, with the bottom of the balls contacting the top of the wedge-shaped slider.

[0009] Preferably, an air pipe is installed inside the cavity. One end of the air pipe passes through the lower mold and is connected to the right front end of the bottom of the threaded groove. The other end of the air pipe is connected to the output end of an external air pump, and the upper output shaft of the dual-axis motor is fixedly connected to the middle end of the bottom of the threaded block.

[0010] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0011] This invention uses a dual-axis motor to simultaneously drive the first ejection mechanism and the second ejection mechanism, so that the product is evenly ejected and demolded, avoiding damage to the product due to uneven force or small force points, and making the demolding process smoother and more reliable.

[0012] In the second ejection mechanism, the design of the threaded block and the threaded groove creates a small lifting gap in the initial stage of rotation and ascent. Combined with the air pipe connected to the bottom of the threaded groove, external air can be introduced to supplement the space between the cavity and the product, avoiding negative pressure. This allows for easy demolding with less force. Furthermore, an external air pump can increase the air pressure, forming a high-pressure air film between the cavity and the product. The resulting thrust can further improve the demolding efficiency. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 This is a front sectional view of the lower mold of this utility model;

[0015] Figure 3 This is one of the three-dimensional sectional views of the lower mold of this utility model;

[0016] Figure 4 This is the second perspective sectional view of the lower mold of this utility model;

[0017] Figure 5 This is a schematic diagram of the threaded groove structure of this utility model;

[0018] Figure 6This is one of the structural schematic diagrams of the second ejection mechanism of this utility model;

[0019] Figure 7 This is the second structural schematic diagram of the second ejection mechanism of this utility model.

[0020] In the diagram: Molding mechanism 1, Cavity 11, Lower mold 12, Auxiliary rod 13, First ejection mechanism 2, Cavity 21, Adjusting rotating plate 22, Wedge slider 23, Ball bearing 24, Dual-axis motor 25, Stepped annular groove 26, Annular ejection plate 27, Ejection rod 28, Slide groove 29, Column 210, Spring 211, Second ejection mechanism 3, Threaded groove 31, Auxiliary ejection plate 32, Threaded block 33, Insert rod 34, Slot 35, Air pipe 4. Detailed Implementation

[0021] 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.

[0022] Please see Figures 1-7 A uniformly stressed extrusion molding die includes a molding mechanism 1. The molding mechanism 1 includes a lower die 12, and the top of the lower die 12 has a cavity 11. A second ejection mechanism 3 is assembled in the cavity 11. The interior of the lower die 12 has a cavity 21, and a first ejection mechanism 2 is assembled and connected in the cavity 21. The first ejection mechanism 2 includes an adjusting plate 22, a wedge-shaped slider 23, a dual-axis motor 25, a stepped annular groove 26, an annular ejection plate 27, and an ejection rod 28. The dual-axis motor 25 is fixedly connected to the top of the cavity 21, and the lower output shaft of the dual-axis motor 25 is connected to the adjusting plate 22. The top of the rotating plate 22 is fixedly connected to the middle end. The rotating plate 22 is adjusted to be in the shape of a windmill, and the surface of the rotating plate 22 contacts the inner side of the wedge slider 23. A groove 29 is provided at the connection between the lower mold 12 and the wedge slider 23. A stepped annular groove 26 is provided at the bottom of the cavity 11. An annular ejector plate 27 is set in the stepped annular groove 26. The upper end of the ejector rod 28 is fixedly connected to the bottom of the annular ejector plate 27. The lower end of the ejector rod 28 passes through the lower mold 12 and is slidably assembled on the inclined surface of the wedge slider 23. The second ejector mechanism 3 is assembled on the top of the upper output shaft of the dual-axis motor 25.

[0023] The windmill-shaped adjustment plate 22 consists of a cylindrical block and a protrusion located on the outer wall of the cylindrical block. The distance between the outermost end of the protrusion and the axis of the cylindrical block is greater than the radius of the cylindrical block. Therefore, when the adjustment plate 22 rotates, it can push the wedge-shaped slider 23 to move outward.

[0024] Turning on the dual-axis motor 25 can drive the windmill-shaped adjustment plate 22 to rotate horizontally, and with the cooperation of the slide groove 29, the four wedge-shaped sliders 23 can be pushed outward simultaneously, and with the cooperation of the ball bearings 24, the ejector rod 28 can drive the annular ejector plate 27 to move upward.

[0025] The upper die of the extrusion molding die is connected to the telescopic end of the external hydraulic rod. A pressure block is installed at the lower end of the upper die. The pressure block is part of the upper die structure and can be replaced according to different products. It is used to extrude plastic or parts in the cavity 11. The two ends of the top of the lower die 12 are fixedly connected to the auxiliary rods 13, and the auxiliary rods 13 are slidably connected to the inner side of the upper die. This allows the upper die to be assisted in limiting the extension of the hydraulic rod to ensure the molding quality. After the product is formed, the hydraulic rod is controlled to retract, so that the upper die and the lower die 12 are separated.

[0026] The second ejection mechanism 3 includes a threaded groove 31, an auxiliary ejection plate 32, and a threaded block 33. The threaded groove 31 is opened at the bottom of the cavity 11, and the threaded block 33 is threadedly connected to the inside of the threaded groove 31. A slot 35 is opened at the middle of the top of the threaded block 33, and a rod 34 is inserted into the inner surface of the slot 35. The rod 34 is fixedly connected to the middle of the bottom of the auxiliary ejection plate 32. Both the threaded block 33 and the threaded groove 31 are stepped structures.

[0027] The upper surface of the auxiliary ejector plate 32 can be provided with grooves or protrusions of different shapes, which can create corresponding patterns on the lower surface of the product.

[0028] The stepped annular groove 26 and the stepped threaded block 33 and threaded groove 31 are designed to reduce the pressure on the ejector rod 28 and the dual-axis motor 25. When extruding, the pressure applied by the upper die is mainly borne by the lower die 12. By designing a stepped shape, the force can be evenly borne by the lower die 12 through the steps.

[0029] The threaded groove 31 has a chamfer, and the outer wall of the auxiliary ejector plate 32 is integrally formed with a conical protrusion corresponding to the chamfer. The diameter of the bottom of the auxiliary ejector plate 32 and the diameter of the top of the threaded block 33 are both smaller than the diameter of the top of the threaded groove 31.

[0030] As the auxiliary ejector plate 32 moves upward, a gap appears between the threaded groove 31 and the threaded block 33 at the step. At the same time, there are gaps between the auxiliary ejector plate 32 and the threaded block 33 and the side of the threaded groove 31, allowing external gas to pass through. Finally, the gas flows out through the gap between the chamfer of the threaded groove 31 and the conical protrusion of the auxiliary ejector plate 32, filling the space between the cavity 11 and the product, thus preventing the formation of a vacuum that would affect the demolding efficiency.

[0031] When the dual-axis motor 25 rotates, it will drive the threaded block 33 to rotate, thereby pushing the auxiliary ejector plate 32 upward with the cooperation of the threaded groove 31. This can achieve the purpose of synchronous ejection of the product inside and outside, avoiding the product from getting stuck in the mold cavity due to unilateral force, and making the demolding process smoother and more reliable.

[0032] The middle end of the bottom of the adjusting plate 22 is movably connected to the bottom of the cavity 21, which can ensure the stability of the rotation of the adjusting plate 22.

[0033] A spring 211 is fixedly connected to the upper end of the inner side of the wedge slider 23, and a column 210 is rotatably connected to the end of the spring 211. The column 210 is fixedly connected to the top of the adjusting plate 22.

[0034] When the adjusting plate 22 rotates, the spring 211 can rotate and stretch along with the wedge slider 23. When resetting, the tension of the spring 211 causes the wedge slider 23 to reset. After transmission, the annular top plate 27 falls back into the stepped annular groove 26. Regardless of whether the adjusting plate 22 rotates, the spring 211 is always in a stretched state, thus ensuring that the spring 211 always exerts a tension on the wedge slider 23 in the direction of the adjusting plate 22.

[0035] The bottom of the ejector rod 28 is parallel to the inclined surface of the top of the wedge slider 23. Multiple equally spaced balls 24 are embedded in the bottom of the ejector rod 28, and the bottom of the balls 24 is in contact with the top of the wedge slider 23.

[0036] The cavity 21 is equipped with an air pipe 4. One end of the air pipe 4 passes through the lower mold 12 and is connected to the right front end of the bottom of the threaded groove 31. The other end of the air pipe 4 is connected to the output end of the external air pump, and the upper output shaft of the dual-axis motor 25 is fixedly connected to the middle end of the bottom of the threaded block 33.

[0037] After the material ejection is completed, the dual-axis motor 25 is controlled to rotate in the opposite direction, so that the threaded block 33 and the adjusting plate 22 are reset. The adjusting plate 22 releases the squeezing state of the wedge slider 23. The wedge slider 23 is reset with the cooperation of the column 210 and the spring 211, and the annular ejector plate 27 is reset synchronously with the cooperation of the ejector rod 28.

[0038] External gas is delivered into the cavity 11 through the air pipe 4, which can instantly break the vacuum negative pressure zone formed between the bottom of the product and the mold, so that demolding can be easily achieved with minimal force. Furthermore, people can turn on the external air pump to inject high-pressure gas as needed, forming a high-pressure air film between the cavity 11 and the product. The resulting thrust can further improve the demolding efficiency.

[0039] In addition, the depth of the thread groove 31 and the thickness of the thread block 33 can be adjusted, as can the thread pitch. When the thread block 33 and the thread groove 31 reach a certain set value, when the dual-axis motor 25 is running, the length of the thread block 33 extending out of the thread groove 31 can be the same as the height of the adjusting plate 22 pushing the wedge slider 23 and thus driving the annular ejector plate 27 to be ejected, so that the auxiliary ejector plate 32 can play the role of auxiliary ejection.

[0040] The dimensions and quantity of structures such as the adjusting plate 22 and the wedge slider 23 can be adjusted according to actual production requirements to meet the smooth ejection requirements of the corresponding product model.

[0041] The operational steps for this application are as follows:

[0042] A. The upper die of the extrusion molding die is connected to the telescopic end of the external hydraulic rod. The two ends of the top of the lower die 12 are fixedly connected to auxiliary rods, and the auxiliary rods are slidably connected to the inner side of the upper die. Thus, when the hydraulic rod extends, it performs auxiliary limiting treatment on the upper die to ensure molding quality. After the product is formed, the hydraulic rod is controlled to retract, so that the upper die and the lower die 12 are separated.

[0043] B. The dual-axis motor 25 can drive the windmill-shaped adjustment plate 22 to rotate horizontally, and with the cooperation of the slide groove 29, the four wedge-shaped sliders 23 can be pushed outward simultaneously, and with the cooperation of the ball bearings 24, the ejector rod 28 can drive the annular ejector plate 27 to move upward, so as to eject and demold the product.

[0044] C. When the dual-axis motor 25 is running, it will also drive the threaded block 33 to rotate and move upward, creating a gap between the auxiliary ejector plate 32, the threaded block 3 and the threaded groove 31. External gas can be delivered to the cavity 11 through the air pipe 4, which can instantly destroy the vacuum negative pressure zone formed between the bottom of the product and the mold, thereby avoiding the influence of negative pressure on the demolding work. Furthermore, people can open the external air pump to fill in high-pressure gas as needed, forming a high-pressure air film between the cavity 11 and the product. The resulting thrust can further improve the demolding efficiency.

[0045] D. After demolding is completed, control the dual-axis motor 25 to rotate in the opposite direction, so that the threaded block 33 and the adjusting plate 22 are reset. The adjusting plate 22 releases the squeezing state of the wedge slider 23. The wedge slider 23 is reset with the cooperation of the column 210 and the spring 211, and the annular ejector plate 27 is reset synchronously with the cooperation of the ejector rod 28.

[0046] 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. An isostatic extrusion die comprising a forming mechanism (1), characterised in that: The forming mechanism (1) comprises a lower die (12), and a cavity (11) is formed in the top of the lower die (12), a second ejection mechanism (3) is arranged in the cavity (11), a cavity (21) is formed in the inside of the lower die (12), a first ejection mechanism (2) is arranged in the cavity (21), the first ejection mechanism (2) comprises an adjusting rotating plate (22), a wedge-shaped sliding block (23), a double-shaft motor (25), a stepped annular groove (26), an annular ejection plate (27) and an ejection rod (28), the double-shaft motor (25) is fixedly connected to the top of the inner cavity of the cavity (21), the lower output shaft of the double-shaft motor (25) is fixedly connected to the middle end of the top of the adjusting rotating plate (22), the adjusting rotating plate (22) is in the shape of a windmill, the side surface of the adjusting rotating plate (22) is in contact with the inner side of the wedge-shaped sliding block (23), a sliding groove (29) is formed at the connecting position of the lower die (12) and the wedge-shaped sliding block (23), the bottom of the cavity (11) is provided with the stepped annular groove (26), the annular ejection plate (27) is arranged in the stepped annular groove (26), the upper end of the ejection rod (28) is fixedly connected to the bottom of the annular ejection plate (27), the lower end of the ejection rod (28) penetrates through the lower die (12) and is slidably arranged on the inclined surface of the wedge-shaped sliding block (23), and the second ejection mechanism (3) is arranged on the top of the upper output shaft of the double-shaft motor (25).

2. The uniform force extrusion forming die of claim 1, wherein: The second ejection mechanism (3) comprises a threaded groove (31), an auxiliary ejection plate (32) and a threaded block (33), the threaded groove (31) is formed in the bottom of the cavity (11), the threaded block (33) is screw-connected to the inside of the threaded groove (31), the middle end of the top of the threaded block (33) is provided with a insertion groove (35), the inner surface of the insertion groove (35) is inserted with an insertion rod (34), the insertion rod (34) is fixedly connected to the middle end of the bottom of the auxiliary ejection plate (32), and the threaded block (33) and the threaded groove (31) are both in stepped structures.

3. The uniform force extrusion die of claim 2, wherein: The threaded groove (31) is provided with a chamfer, the auxiliary ejection plate (32) is integrally formed with a tapered protrusion corresponding to the chamfer, and the diameter of the bottom of the auxiliary ejection plate (32) and the diameter of the top of the threaded block (33) are both smaller than the diameter of the top of the threaded groove (31).

4. The uniform force extrusion die of claim 1, wherein: The upper end of the inner side of the wedge-shaped sliding block (23) is fixedly connected with a spring (211), the tail end of the spring (211) is rotatably connected with a stand (210), and the stand (210) is fixedly connected to the top of the adjusting rotating plate (22).

5. The uniform force extrusion die of claim 1, wherein: The bottom of the ejection rod (28) is parallel to the inclined surface of the top of the wedge-shaped sliding block (23), the bottom of the ejection rod (28) is embedded with a plurality of equidistantly distributed rolling balls (24), and the bottom of the rolling ball (24) is in contact with the top of the wedge-shaped sliding block (23).

6. The uniform force extrusion die of claim 1, wherein: The cavity (21) is arranged with an air pipe (4), one end of the air pipe (4) penetrates through the lower die (12) and is in communication with the right front end of the bottom of the threaded groove (31), the other end of the air pipe (4) is in communication with the output end of an external air pump, and the middle end of the bottom of the threaded block (33) is fixedly connected to the upper output shaft of the double-shaft motor (25).

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