Powder metallurgy mold convenient to demold

Abstract

The utility model discloses a powder metallurgy mould convenient to demould, which relates to the field of powder metallurgy mould, and comprises a bottom plate and a frame, the top of the frame is provided with a driving component, the output end of the driving component is connected with an upper pressing plate, the bottom plate is provided with a placing groove, and the bottom of the bottom plate is provided with an ejector pin. A positioning hole is formed in the bottom plate, a tooth block is arranged on one side of the guide rod, a fixed gear is connected into an interlayer of the bottom plate, one end of the fixed gear is connected with a worm, and a worm wheel is arranged in the interlayer of the bottom plate. According to the utility model, the fixed gear is driven to rotate under the matching of the gear block, and the worm gear is driven to rotate at the moment, so that a pressed product is separated from the inner wall of the bottom plate in a clearance way, the internal product is convenient to demould and is directly ejected out through the ejector pin, and the abrasion caused when the ejector pin directly ejects the product can be effectively avoided in the process; and the overall processing quality is improved.

Description

Technical Field

[0001] The utility model relates to the field of powder metallurgy molds, in particular to a powder metallurgy mold which is easy to demould. Background Art

[0002] Powder metallurgy forming is one of the basic processes in powder metallurgy production. Its purpose is to pressurize loose powder in a mold into a semi-finished product with a predetermined geometric shape, size, density and strength, and then demold the semi-finished blank. Compression molding is the most widely used forming method in powder metallurgy production. Powder metallurgy has a unique chemical composition and mechanical and physical properties that cannot be obtained by traditional casting methods. Powder metallurgy technology can be used to directly produce porous, semi-dense or fully dense materials and products, such as gears. Powder metallurgy is a product process that is pressed out with little or no cutting.

[0003] During the processing of existing powder metallurgy molds, a certain amount of powder is poured into the base plate, and then it is preformed by the action of the upper pressure plate. During this process, the preformed product will adhere to the inner wall of the base plate, making it difficult to demold. If a straight up and down removal method is adopted, it will cause overall wear of the product and affect the overall processing quality.

[0004] In summary, the above structure will cause the product to stick to the inner wall of the base plate during processing, making it difficult to demould. If a straight-up or straight-down removal method is adopted, it will cause overall wear of the product and affect the overall processing quality. Utility Model Content

[0005] Based on this, the purpose of the utility model is to provide a powder metallurgy mold that is easy to demold, so as to solve the technical problem that the product will stick to the inner wall of the base plate during the processing, making it difficult to demold. If a straight up and down removal method is adopted, it will cause overall wear of the product and affect the overall processing quality.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a powder metallurgy mold that is easy to demold, comprising a base plate and a frame, a driving assembly is arranged on the top of the frame, an upper pressure plate is connected to the output end of the driving assembly, a placement groove for the upper pressure plate to be inserted into is arranged on the base plate, an array of ejector pins is slidingly arranged on the bottom of the base plate, a guide rod is arranged on the output end of the driving assembly, and a positioning hole for the guide rod to be inserted into is arranged on the base plate, a gear block is arranged on the upper part of one side of the guide rod, and a fixed gear meshing with the gear block is rotatably connected in the interlayer of the base plate, one end of the fixed gear is connected to a worm, and a worm wheel cooperating with the worm is rotatably arranged in the interlayer of the base plate.

[0007] By adopting the above technical solution, the guide rod will slide upward from the positioning hole under the action of the cylinder, and drive the fixed gear to rotate through the cooperation of the tooth block. At the same time, the worm will drive the worm wheel in the bottom plate interlayer to rotate. At this time, the rotation of the worm wheel will cause a gap between the pressed product and the inner wall of the bottom plate, which is convenient for the internal product to be demolded and directly ejected by the ejector pin. In this process, the wear caused by the ejector pin directly lifting the product can be effectively avoided, thereby improving the overall processing quality.

[0008] The utility model is further configured that the driving component is a cylinder, and the cylinder is used to drive the upper pressure plate at the output end to slide up and down.

[0009] By adopting the above technical solution, it is convenient for the staff to control the overall pressure and downward pressing height of the upper pressing plate under the action of the cylinder, thereby further improving the pressing quality of the product.

[0010] The utility model is further configured that a compression spring is arranged at the bottom of the positioning hole on the bottom plate, and a lower pressing plate is connected to the other end of the compression spring, and the top of the lower pressing plate is connected to the array ejector pins.

[0011] By adopting the above technical solution, when the upper pressure plate is driven to slide downward by the action of the cylinder, the bottom end of the guide rod will contact the top of the lower pressure plate. At this time, the compression spring is in a compressed state as a whole during the downward pressing process. After the product is pressed, the cylinder will drive the upper pressure plate to reset and slide. At this time, the lower pressure plate will slide upward under the reset action of the compression spring, driving the ejector pin to move upward to lift the pressed product. In this process, there is no need to manually pick up the product, and the worm gear further improves the overall demoulding effect of the product.

[0012] The utility model is further configured that a through hole with the same diameter as the placement slot is provided at the middle position of the worm wheel.

[0013] By adopting the above technical solution, the worm wheel itself will not limit the upper pressing plate when the upper pressing plate slides downward, thereby ensuring the stability of the upper pressing plate in pressing the product and further improving the processing efficiency of powder metallurgy.

[0014] The utility model is further configured that the inner wall of the worm wheel is configured to be rough.

[0015] By adopting the above technical solution, the rough setting is convenient for increasing the friction between the pressed product, and the rough setting can make the product shake during the rotation of the worm gear, further ensuring the demoulding effect of the product from the inside of the bottom plate.

[0016] The utility model is further configured that the bottom plate is provided with a slot for the ejector pin to slide, and is located between the two to form a sealing arrangement.

[0017] By adopting the above technical solution, the groove makes it easier for the ejector pin to slide up and down in the bottom plate, and the sealing setting between the two can effectively prevent metal powder from entering the gap between the two, further improving the stability of the reciprocating sliding of the ejector pin and preventing metal powder from entering the interior of the positioning hole.

[0018] The utility model is further configured that one end of the top of the ejector pin is configured in an arc shape.

[0019] By adopting the above technical solution, the arc-shaped setting can effectively reduce the pressure on the bottom of the product when the ejector pin is lifted, further reducing the possibility of damage to the bottom of the product.

[0020] The utility model is further configured such that the contact surface between the guide rod and the positioning hole is smooth.

[0021] By adopting the above technical solution, when the cylinder drives the upper pressing plate to slide downward, the guide rod can be prevented from getting stuck in the positioning hole, ensuring that the upper pressing plate is always in a horizontal state during the up and down sliding process, thereby improving the pressing quality of powder metallurgy.

[0022] In summary, the utility model mainly has the following beneficial effects:

[0023] The utility model provides a fixed gear in the bottom plate, and drives the upper pressing plate to move downward to press the product under the action of the cylinder. After the pressing is completed, the guide rod will slide upward from the positioning hole under the action of the cylinder, and drive the fixed gear to rotate through the cooperation of the tooth block. At the same time, the worm will drive the worm wheel in the interlayer of the bottom plate to rotate. At this time, the rotation of the worm wheel will cause a gap to separate the pressed product from the inner wall of the bottom plate, which is convenient for demoulding the internal product and directly ejecting it through the ejector pin. In this process, the wear caused by the ejector pin directly lifting the product can be effectively avoided, thereby improving the overall processing quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a three-dimensional diagram of the utility model;

[0025] Figure 2 It is a cross-sectional view of the utility model;

[0026] Figure 3 This is a schematic diagram of the worm gear structure of the utility model;

[0027] Figure 4 For this utility model Figure 1 A is an enlarged view of the middle image.

[0028] In the figure: 1. bottom plate; 2. frame; 3. positioning hole; 4. tooth block; 5. guide rod; 6. cylinder; 7. upper pressure plate; 8. placement groove; 9. fixed gear; 10. ejector pin; 11. compression spring; 12. lower pressure plate; 13. worm; 14. worm wheel. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. The embodiments described below with reference to the drawings are exemplary and are only used to explain the utility model, and cannot be understood as limiting the utility model.

[0030] The following describes an embodiment of the utility model based on its overall structure.

[0031] Embodiment 1

[0032] A powder metallurgy mold that is easy to demould, such as Figure 1-Figure 4 As shown, it includes a base plate 1, a frame 2, a reset mechanism, a rotation mechanism and a demoulding mechanism, wherein a cylinder 6 is arranged on the top of the frame 2, and the output end of the cylinder 6 is connected to an upper pressing plate 7, wherein a placement groove 8 for the upper pressing plate 7 to be inserted into is arranged on the top of the base plate 1, and the staff places a certain amount of metal powder in the placement groove 8, and then starts the cylinder 6 to drive the upper pressing plate 7 to move into the placement groove 8 to press the metal powder, and at the same time, a guide rod 5 is arranged at the output end of the cylinder 6, and a positioning hole 3 for the guide rod 5 to be inserted into is arranged on the base plate 1, and the stability of the upper pressing plate 7 in pressing the metal powder is ensured by the cooperation of the guide rod 5 and the positioning hole 3. After the pressing is completed, the cylinder 6 will reset upward to drive the upper pressing plate 7 to reset and slide, because a tooth block 4 is arranged on the upper part of one side of the guide rod 5, and a tooth block 4 is rotatably connected with the guide rod 5 in the interlayer of the base plate 1 The fixed gear 9 is meshed with the tooth block 4, so when it slides upward at the beginning, it will drive the fixed gear 9 to rotate, wherein one end of the fixed gear 9 is connected to a worm 13, and a worm wheel 14 cooperating with the worm 13 is rotatably arranged in the interlayer of the bottom plate 1. In the process of the fixed gear 9 driving the worm 13 to rotate, the worm 13 will drive the worm wheel 14 in the interlayer of the bottom plate 1 to rotate. At this time, the rotation of the worm wheel 14 will cause a gap separation between the pressed product and the inner wall of the bottom plate 1, which is convenient for the internal product to be demoulded and directly ejected by the ejector pin 10. In this process, the wear caused by the ejector pin 10 directly ejecting the product can be effectively avoided, thereby improving the overall processing quality, and the top end of the ejector pin 10 is arranged in an arc shape, which can effectively reduce the pressure on the bottom of the product when the ejector pin 10 is ejected, further reducing the damage to the bottom of the product.

[0033] See also Figure 1 and Figure 3A through hole with the same aperture as the placement slot 8 is provided at the middle position of the worm wheel 14. When the upper pressing plate 7 slides downward, the worm wheel 14 itself will not limit the upper pressing plate 7, thereby ensuring the stability of the upper pressing plate 7 in pressing the product, further improving the processing efficiency of powder metallurgy, and the inner wall of the worm wheel 14 is roughened, which is convenient for increasing the friction between the pressed product and the product, and the roughened setting can make the product shake during the rotation of the worm wheel 14, further ensuring the demoulding effect of the product from the inside of the bottom plate 1.

[0034] See also Figure 2 The bottom plate 1 is provided with a groove for the ejector pin 10 to slide, and a sealing arrangement is formed between the two. The groove facilitates the ejector pin 10 to slide up and down in the bottom plate 1. At the same time, the sealing arrangement between the two can effectively prevent metal powder from entering the gap between the two, further improving the stability of the reciprocating sliding of the ejector pin 10 and preventing metal powder from entering the interior of the positioning hole 3.

[0035] Embodiment 2

[0036] like Figure 2 The powder metallurgy mold shown is easy to demould, and its overall structure is similar to that of Example 1, wherein a compression spring 11 is arranged at the bottom of the positioning hole 3 on the bottom plate 1, and a lower pressing plate 12 is connected to the other end of the compression spring 11, and the top of the lower pressing plate 12 is connected to the array ejector pins 10. When the upper pressing plate 7 is driven to slide downward by the action of the cylinder 6, the bottom end of the guide rod 5 will contact the top of the lower pressing plate 12. At this time, the compression spring 11 is in a compressed state as a whole during the downward pressing process. After the product is pressed, the cylinder 6 will drive the upper pressing plate 7 to reset and slide. At this time, the lower pressing plate 12 will slide upward under the reset action of the compression spring 11, driving the ejector pin 10 to move upward to lift the pressed product. In this process, there is no need to manually pick up the product, and the worm gear 14 is used to further improve the overall demoulding effect of the product.

[0037] The working principle of the utility model is as follows: when in use, metal powder is poured into the placement groove 8 of the bottom plate 1, and then the cylinder 6 on the top of the frame 2 is started. Under the action of the cylinder 6, the upper pressing plate 7 at the output end is driven to slide up and down. At this time, the upper pressing plate 7 enters the placement groove 8 to extrude the metal powder, and then slides upward through the cylinder 6. During this process, the guide rod 5 will slide upward, and under the action of the gear block 4, the fixed gear 9 in the bottom plate 1 is driven to rotate. Through the cooperation of the fixed gear 9 and the worm 13, the worm wheel 14 in the interlayer of the bottom plate 1 is rotated, and the inner wall of the worm wheel 14 is rotated and rubbed with the product, so that the pressed product is separated from the inner wall of the bottom plate 1 by a gap, which is convenient for the internal product to be demolded and directly ejected by the ejector pin 10.

[0038] Although an embodiment of the utility model has been shown and described, this specific embodiment is only an explanation of the utility model and is not a limitation of the utility model. The specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions and variations to the embodiments without creative contribution as needed without departing from the principles and purpose of the utility model. However, as long as they are within the scope of the claims of the utility model, they are protected by patent law.

Claims

1. A powder metallurgy mold for easy demoulding, comprising a base plate (1) and a frame (2), characterized in that: A driving assembly is arranged at the top of the frame (2), the output end of the driving assembly is connected to an upper pressure plate (7), a placement groove (8) for the upper pressure plate (7) to be inserted is arranged on the bottom plate (1), an array of ejector pins (10) is slidably arranged at the bottom of the bottom plate (1), a guide rod (5) is arranged at the output end of the driving assembly, and a positioning hole (3) for the guide rod (5) to be inserted is arranged on the bottom plate (1), a gear block (4) is arranged on the upper part of one side of the guide rod (5), and a fixed gear (9) meshing with the gear block (4) is rotatably connected in the interlayer of the bottom plate (1), one end of the fixed gear (9) is connected to a worm (13), and a worm wheel (14) cooperating with the worm (13) is rotatably arranged in the interlayer of the bottom plate (1).

2. The powder metallurgy mold for easy demoulding according to claim 1, characterized in that: The driving component is a cylinder (6), and the cylinder (6) is used to drive the upper pressure plate (7) at the output end to slide up and down.

3. The powder metallurgy mold for easy demoulding according to claim 1, characterized in that: A compression spring (11) is provided at the bottom of the positioning hole (3) on the bottom plate (1), and a lower pressing plate (12) is connected to the other end of the compression spring (11), and the top of the lower pressing plate (12) is connected to the array ejector pins (10).

4. The powder metallurgy mold for easy demoulding according to claim 1, characterized in that: A through hole having the same diameter as the placement groove (8) is provided at the middle position of the worm wheel (14).

5. The powder metallurgy mold for easy demoulding according to claim 1, characterized in that: The inner wall of the worm wheel (14) is arranged in a rough shape.

6. The powder metallurgy mold for easy demoulding according to claim 1, characterized in that: The bottom plate (1) is provided with a slot for the ejector pin (10) to slide, and is located between the two in a sealed manner.

7. The powder metallurgy mold for easy demoulding according to claim 1, characterized in that: One end of the top of the ejector pin (10) is arranged in an arc shape.

8. The powder metallurgy mold for easy demoulding according to claim 1, characterized in that: The contact surface between the guide rod (5) and the positioning hole (3) is arranged to be smooth.

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