Powder metallurgy stepped product shaping female die chip removal structure

Abstract

The utility model provides a powder metallurgy stepped product shaping female die chip removal structure which comprises a female die base, and a lower tooth extrusion female die, an upper tooth guide plate, an upper tooth extrusion female die combination and an upper cover plate are sequentially arranged on the top face of the female die base upwards. A through chip groove is formed in the bottom face of the upper tooth guide plate and arranged in the radial direction of the upper tooth guide plate, an external blowing device is arranged on the outer side of the upper tooth guide plate, and the external blowing device corresponds to one end of the chip groove. According to the utility model, the through chip groove is formed in the bottom surface of the upper tooth guide plate, air is blown to the chip groove through an external blowing device during the time interval of extruding the upper and lower teeth of a product to be extruded, and burrs falling during the extrusion of the upper teeth can be blown out of a die cavity through the adjustment of air speed and direction; and the procedure of deburring and reshaping after the product is sintered is omitted, the circulation time is shortened, and the cost is saved.

Description

Technical Field

[0001] The utility model relates to the technical field of powder metallurgy shaping dies, and particularly relates to a chip removal structure for a powder metallurgy stepped product shaping female die. Background Art

[0002] Powder metallurgy products are formed by die casting in cooperation with dies from metal powders (or mixed powders of metals and non-metals). With the progress of pressing, the dies are prone to generate gaps due to multiple frictions, resulting in burrs on the products, which is a major characteristic of the powder metallurgy process. The previous processes of powder metallurgy products are generally pressing - sintering - shaping. Burrs are generated during pressing, and part of the burrs can be removed through the chamfer design of the die during shaping. However, products with flanges or steps are special because the pressing and shaping female dies for such products usually also need to have steps. If products with flanges or steps are directly shaped after sintering, there are the following technical defects: there is no chip removal function design, and the removed burr chips will fall into the cavity of the female die base, reducing the die life; if they fall on the end face of the lower tooth extrusion female die, it will directly affect the product appearance; and after the product is sintered, it is necessary to remove burrs and then shape, which not only consumes transfer time but also is not conducive to cost saving.

[0003] Therefore, how to design a chip removal structure for a powder metallurgy stepped product shaping female die has become an urgent problem to be solved. Summary of the Utility Model

[0004] Aiming at the problems existing in the prior art, the utility model provides a chip removal structure for a powder metallurgy stepped product shaping female die to solve at least one of the above technical problems.

[0005] The technical solution of the utility model is: a chip removal structure for a powder metallurgy stepped product shaping female die, including a product to be extruded and a female die base. The product to be extruded is a stepped product. On the top surface of the female die base, a lower tooth extrusion female die, an upper tooth guiding plate, an upper tooth extrusion female die combination, and an upper cover plate are sequentially arranged upward. The upper cover plate, the upper tooth extrusion female die combination, the upper tooth guiding plate, the lower tooth extrusion female die, and the female die base are all connected and positioned by bolts and positioning pins. The cavities of the upper cover plate, the upper tooth extrusion female die combination, and the upper tooth guiding plate can allow the large end of the product to be extruded to pass through, and the cavities of the lower tooth extrusion female die and the female die base can allow the small end of the product to be extruded to pass through; a through chip removal groove is arranged on the bottom surface of the upper tooth guiding plate, the chip removal groove is arranged along the radial direction of the upper tooth guiding plate, and an external air blowing device is arranged outside the upper tooth guiding plate, and the external air blowing device is correspondingly arranged at one end of the chip removal groove.

[0006] The utility model adopts a chip removal groove penetrating through the bottom surface of the upper tooth guide plate. During the time interval of extruding the upper and lower teeth of the product to be extruded, the chip removal groove is blown by an external air blowing device. After adjusting the wind speed and direction, the burr chips falling when extruding the upper teeth can be blown out of the die cavity, solving the technical defect of the prior art without a chip removal function design, where the removed burr chips will fall into the die cavity of the female die base, resulting in a reduction in the die life; if they fall on the end face of the lower tooth extruding the female die, it will directly affect the appearance of the product. It omits the process of deburring and reshaping after product sintering, reduces the transfer time, and is beneficial to cost savings. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is a schematic installation structure diagram of the utility model.

[0008] Figure 2 It is a top view of the upper tooth guide plate of the utility model.

[0009] In the figure: 1. upper cover plate; 2. upper tooth extrusion female die combination; 3. upper tooth guide plate; 4. product to be extruded; 5. lower tooth extrusion female die; 6. female die base; 301. chip removal groove. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0010] The following further describes the utility model with reference to the drawings.

[0011] Refer to Figure 1-2 , the structures, ratios, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the implementation conditions of the utility model. Therefore, they do not have technical substantive significance. Any modification of the structure, change of the proportional relationship, or adjustment of the size, without affecting the effects that the utility model can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in the utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle", and "one" cited in this specification are only for the convenience of clear narration and are not used to limit the implementation scope of the utility model. The change or adjustment of their relative relationships, without substantial change in the technical content, should also be regarded as the scope where the utility model can be implemented.

[0012] Example 1. A chip removal structure for a powder metallurgy stepped product shaping female die, referring to Figure 1 , Figure 2, including the product to be extruded 4 and the female die base 6. The product to be extruded 4 is a stepped product. On the top surface of the female die base 6, there are successively arranged a lower tooth extrusion female die 5, an upper tooth guide plate 3, an upper tooth extrusion female die combination 2, and an upper cover plate 1 from bottom to top. The upper cover plate 1, the upper tooth extrusion female die combination 2, the upper tooth guide plate 3, the lower tooth extrusion female die 5, and the female die base 6 are all connected and positioned by bolts and positioning pins. The cavities of the upper cover plate 1, the upper tooth extrusion female die combination 2, and the upper tooth guide plate 3 can allow the large end of the product to be extruded 4 to pass through, and the cavities of the lower tooth extrusion female die 5 and the female die base 6 can allow the small end of the product to be extruded 4 to pass through; a through chip removal groove 301 is arranged on the bottom surface of the upper tooth guide plate 3, and the chip removal groove 301 is arranged radially along the upper tooth guide plate 3. An external air blowing device is arranged on the outside of the upper tooth guide plate 3, and the external air blowing device is correspondingly arranged at one end of the chip removal groove 301. The utility model adopts a through chip removal groove arranged on the bottom surface of the upper tooth guide plate. The chip removal groove is a through chip removal groove with a certain width and height. During the time interval between the extrusion of the upper and lower teeth of the product to be extruded, the external air blowing device blows air into the chip removal groove. Through the adjustment of the wind speed and direction, the burr chips dropped during the extrusion of the upper teeth can be blown out of the die cavity. The upper tooth guide plate is a transition plate before the lower teeth of the product to be extruded are extruded after the upper teeth of the product to be extruded are extruded, and it is a functional plate for chip removal of the female die, solving the technical defect of the existing technology without a chip removal function design. The burr chips removed will fall into the die cavity of the female die base, resulting in a reduction in the die life; if they fall on the end face of the lower tooth extrusion female die, it will directly affect the appearance of the product. It saves the process of deburring and reshaping after the product is sintered, reduces the transfer time, and is beneficial to cost saving.

[0013] Embodiment 2: On the basis of Embodiment 1, the upper tooth extrusion female die combination 2 is composed of female die plates with three different tooth profile parameters. The utility model adopts a combination of female die plates with three different tooth profile parameters, which can extrude the upper teeth at the large end of the product to be extruded more precisely.

[0014] Embodiment 3: On the basis of Embodiment 2, the female die plates with three different tooth profile parameters are stacked up and down. The utility model adopts the stacking of female die plates with three different tooth profile parameters up and down, which can extrude the upper teeth at the large end of the product to be extruded more precisely.

[0015] Embodiment 4: On the basis of Embodiment 2, the height of the upper tooth guide plate 3 is greater than the height of the product to be extruded 4. The utility model adopts that the height of the upper tooth guide plate is slightly higher than the height of the product to be extruded. During the time interval between the extrusion of the upper and lower teeth, the external air blowing device blows air into the chip removal groove. Through the adjustment of the wind speed and direction, the burr chips dropped during the extrusion of the upper teeth can be blown out of the die cavity.

[0016] Embodiment 5: On the basis of Embodiment 1, the mold cavity of the upper cover plate 1 is a stepped hole, and the large end of the stepped hole is a frustum-shaped hole. The mold cavity of the upper cover plate of the present utility model adopts a stepped hole, and the large end of the stepped hole is a frustum-shaped hole, which fixes the female mold and plays a guiding role for the product to be extruded.

[0017] The above are only the preferred embodiments of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present utility model, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present utility model.

Claims

1. A powder metallurgy stepped product shaping female die chip removal structure, comprising a product to be extruded (4) and a female die base (6), wherein the product to be extruded (4) is a stepped product, and is characterized in that: The top surface of the female die base (6) is provided with a lower tooth extrusion female die (5), an upper tooth guide plate (3), an upper tooth extrusion female die assembly (2), and an upper cover plate (1) in sequence upwards. The upper cover plate (1), the upper tooth extrusion female die assembly (2), the upper tooth guide plate (3), the lower tooth extrusion female die (5), and the female die base (6) are connected and positioned by bolts and positioning pins. The die cavities of the upper cover plate (1), the upper tooth extrusion female die assembly (2), and the upper tooth guide plate (3) allow the large end of the product (4) to be extruded to pass through, and the die cavities of the lower tooth extrusion female die (5) and the female die base (6) allow the small end of the product (4) to be extruded to pass through. The bottom surface of the upper tooth guide plate (3) is provided with a through chip removal groove (301), and the chip removal groove (301) is arranged radially along the upper tooth guide plate (3). An external air blowing device is provided on the outer side of the upper tooth guide plate (3), and the external air blowing device is arranged corresponding to one end of the chip removal groove (301).

2. The powder metallurgy step product shaping female die chip removal structure according to claim 1, characterized in that: The upper tooth extrusion female die assembly (2) comprises a combination of three levels of female die plates with different tooth profile parameters.

3. The powder metallurgy step product shaping female die chip removal structure according to claim 2, characterized in that: The three levels of female mold plates with different tooth profile parameters are stacked up and down.

4. The powder metallurgy step product shaping female die chip removal structure according to claim 2, characterized in that: The height of the upper tooth guide plate (3) is greater than the height of the product to be extruded (4).

5. The powder metallurgy step product shaping female die chip removal structure according to claim 1, characterized in that: The mold cavity of the upper cover plate (1) is a stepped hole, and the large end of the stepped hole is a truncated cone hole.

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