Circumferential sprue three-plate mold point glue feeding structure for cylindrical powder metallurgy product

Abstract

The utility model discloses a circumferential sprue three-plate mold point glue feeding structure of a cylindrical powder metallurgy product. The circumferential sprue three-plate mold point glue feeding structure comprises a glue injection runner, a circumferential side sprue arranged at a port of the glue injection runner, and a transition part which is arranged at the center bottom end of the circumferential side sprue and extends downwards, the peripheral side gate comprises an upper plane part, an inclined ring surface part arranged on the periphery of the upper plane part and a lower plane part positioned below the upper plane part, a port of the glue injection runner is correspondingly butted with the center of the upper plane part, and a peripheral gate corresponding to a cavity of a molded product is formed in the peripheral directions of the inclined ring surface part and the lower plane part. And the transition part is correspondingly butted with the center of the lower plane part. According to the utility model, the rotary circumferential ring side glue feeding mode of point glue feeding is changed, and the problem of black lines on the appearance surface of a product is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of glue injection molds, in particular to a glue injection structure of a three-plate mold with a circumferential gate for cylindrical powder metallurgy products. Background Art

[0002] The black streak problem is common in the powder metallurgy injection process. It is a powder-glue separation phenomenon, which means that the powder concentration is unevenly distributed in the flow field and produces black lines. According to experimental observations, the concentration in the middle of the flow field is higher and the concentration near the boundary is lower, which is related to the shear rate; therefore, when the powder concentration in the flow field is high or low, powder-glue separation will occur, and the possibility of producing black lines will increase greatly.

[0003] There is a cylindrical structure product. The traditional point-in-gluing method has serious black lines near the gate area and the black lines in the side welding area of ​​the product are also relatively serious. Utility Model Content

[0004] The purpose of the utility model is to solve the above technical problems and provide a cylindrical powder metallurgy product circumferential gate three-plate mold point injection structure, so as to change the point injection to circumferential side injection mode and avoid the problem of black lines on the product appearance. In order to achieve the above purpose, the technical solution of the utility model is as follows:

[0005] A three-plate mold point-injection structure for a cylindrical powder metallurgy product with a circumferential gate comprises a glue injection channel, a circumferential side gate arranged at the port of the glue injection channel, and a transition portion arranged at the central bottom end of the circumferential side gate and extending downward; the circumferential side gate comprises an upper plane portion, an inclined annular portion arranged at the circumference of the upper plane portion, and a lower plane portion located below the upper plane portion, the port of the glue injection channel corresponds to the center of the upper plane portion, the circumference of the inclined annular portion and the lower plane portion form a circumferential gate of a mold cavity corresponding to a molded product, and the transition portion corresponds to the center of the lower plane portion.

[0006] Specifically, the point-in-gluing structure is arranged in a mold, and the mold includes a lower insert, a plurality of molding blocks arranged around the lower insert and arranged in an enclosed and spliced ​​manner, and an upper insert corresponding to the lower insert for mold closing.

[0007] Specifically, a cavity for forming a product is formed between the lower insert, the upper insert and a plurality of forming blocks, the upper insert is arranged in an upper template, and the upper template corresponds to a plurality of forming blocks in a molded manner.

[0008] Specifically, a top groove for reserving a transition portion is provided on the top of the lower insert.

[0009] Specifically, push rods that extend and penetrate the lower insert are arranged on both sides of the lower insert, and a group of push pins are symmetrically arranged on both sides of each push rod in the lower insert.

[0010] Specifically, the end surfaces of a plurality of the forming blocks close to the lower insert are joined together to form a circle, and each of the forming blocks is driven to move horizontally.

[0011] Specifically, the product includes a cylindrical barrel structure, a circular hole is arranged at the top center of the cylindrical barrel structure, and the peripheral side gate is butt-jointed with the circumferential position of the lower edge of the circular hole.

[0012] Compared with the prior art, the beneficial effects of the cylindrical powder metallurgy product circumferential gate three-plate mold point injection structure of the utility model are mainly reflected in:

[0013] By optimizing the method of switching from point-to-point gluing to peripheral side gluing, the peripheral side gate structure is equipped with a transition part, an upper plane part, and an inclined annular surface part to change the transition area of ​​gluing, thereby changing the mold flow to avoid the problem of powder-glue separation and improve the black line phenomenon. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of an embodiment of the utility model;

[0015] Figure 2 This is a schematic diagram of the local structure of the lower insert in this embodiment;

[0016] Figure 3 This is a schematic diagram of the product structure in this embodiment;

[0017] Figure 4 This is a schematic diagram of the cross-sectional structure of the product in this embodiment;

[0018] The numbers in the figure represent:

[0019] 1 injection runner, 2 peripheral side gate, 21 upper plane portion, 22 inclined annular portion, 23 lower plane portion, 3 transition portion, 4 product, 41 cylindrical barrel structure, 42 upper flange, 43 lower flange, 44 round hole, 5 lower insert, 51 molding block, 52 upper insert, 53 upper template, 54 top groove, 6 ejector rod, 61 ejector pin. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present utility model are clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments.

[0021] Example:

[0022] Reference Figure 1-4As shown, this embodiment is a three-plate mold point-injection structure for a cylindrical powder metallurgy product with a circumferential gate, including a glue injection channel 1, a circumferential side gate 2 arranged at the port of the glue injection channel 1, and a transition portion 3 arranged at the central bottom end of the circumferential side gate 2 and extending downward; the circumferential side gate 2 includes an upper plane portion 21, an inclined annular portion 22 arranged around the upper plane portion 21, and a lower plane portion 23 located below the upper plane portion 21, the port of the glue injection channel 1 is correspondingly connected to the center of the upper plane portion 21, the circumference of the inclined annular portion 22 and the lower plane portion 23 forms a circumferential gate of the cavity corresponding to the molded product 4, and the transition portion 3 is correspondingly connected to the center of the lower plane portion 23.

[0023] The point-in-gluing structure is arranged in the mold, and the mold includes a lower insert 5, a plurality of molding blocks 51 arranged around the lower insert 5 and arranged in a surrounding splicing arrangement, and an upper insert 52 corresponding to the lower insert 5; a cavity for molding the product 4 is formed between the lower insert 5, the upper insert 52 and the plurality of molding blocks 51. The upper insert 52 is arranged in an upper mold plate 53, and the upper mold plate 53 corresponds to the plurality of molding blocks 51.

[0024] A top groove 54 for the transition portion 3 is provided at the top of the lower insert 5. Both sides of the lower insert 5 are provided with push rods 6 that extend and penetrate the interior thereof, and a group of push pins 61 are symmetrically provided on both sides of each push rod 6 in the lower insert 5. The push rods 6 and the push pins 61 can stably eject the product 4 that is undercut and formed in the circumferential direction of the lower insert 5.

[0025] The plurality of forming blocks 51 are arranged in four directions respectively. The end surfaces of the plurality of forming blocks 51 close to the lower insert 5 are assembled and spliced ​​into a circle. Each forming block 51 is driven to move horizontally, and a cylindrical barrel structure of the forming product 4 is formed between the lower insert 5 and the plurality of forming blocks 51 .

[0026] The product 4 includes a cylindrical barrel structure 41, an upper flange 42 arranged on the top circumference of the cylindrical barrel structure 41, and a lower flange 43 arranged on the bottom circumference of the cylindrical barrel structure 41. A circular hole 44 is arranged at the top center of the cylindrical barrel structure 41, and the peripheral side gate 2 is connected to the circumferential position of the lower edge of the circular hole 44. The peripheral side gate 2 injects glue into the cavity of the molded product 4, and the injected glue is evenly diffused from the peripheral side gate 2 to the surroundings.

[0027] In this embodiment, the point-to-point glue injection method is optimized to switch to the circumferential side glue injection method. The circumferential side gate 2 structure is used to set the transition part 3, the upper plane part 21, and the inclined annular surface part 22 to change the transition area of ​​the glue injection, thereby changing the mold flow to avoid the powder-glue separation problem and improve the black line phenomenon.

[0028] In the description of this specification, the term "specific embodiment" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0029] Although the implementation methods disclosed in the utility model are as above, the above contents are only implementation methods adopted to facilitate the understanding of the utility model, and are not used to limit the utility model. Any technician in the field to which the utility model belongs can make any modifications and changes in the form and details of implementation without departing from the spirit and scope disclosed in the utility model, but the scope of patent protection of the utility model shall still be based on the scope defined in the attached claims.

Claims

1. Cylindrical powder metallurgy product circumferential gate three-plate mold point injection structure, characterized by: It includes a glue injection channel, a circumferential side gate arranged at the port of the glue injection channel, and a transition portion arranged at the central bottom end of the circumferential side gate and extending downward; the circumferential side gate includes an upper plane portion, an inclined annular portion arranged at the circumference of the upper plane portion, and a lower plane portion located below the upper plane portion, the port of the glue injection channel is correspondingly connected to the center of the upper plane portion, the circumference of the inclined annular portion and the lower plane portion forms a circumferential gate of the cavity corresponding to the molded product, and the transition portion is correspondingly connected to the center of the lower plane portion.

2. The cylindrical powder metallurgy product circumferential gate three-plate mold point injection structure according to claim 1, characterized in that: The point-in-gluing structure is arranged in a mold, and the mold includes a lower insert, a plurality of molding blocks arranged around the lower insert and arranged in a surrounding and spliced ​​manner, and an upper insert corresponding to the lower insert.

3. The cylindrical powder metallurgy product circumferential gate three-plate mold point injection structure according to claim 2, characterized in that: A cavity for forming a product is formed between the lower insert, the upper insert and a plurality of forming blocks. The upper insert is arranged in an upper template, and the upper template corresponds to a plurality of forming blocks in a molded manner.

4. The cylindrical powder metallurgy product circumferential gate three-plate mold point injection structure according to claim 2, characterized in that: A top groove for a reserved transition portion is arranged on the top of the lower insert.

5. The cylindrical powder metallurgy product circumferential gate three-plate mold point injection structure according to claim 2, characterized in that: Both sides of the lower insert are provided with push rods which are telescopically penetrated inside the lower insert, and a group of push pins are symmetrically provided on both sides of each push rod in the lower insert.

6. The cylindrical powder metallurgy product circumferential gate three-plate mold point injection structure according to claim 2, characterized in that: The end surfaces of a plurality of the forming blocks close to the lower insert are joined together to form a circle, and each of the forming blocks is driven to move horizontally.

7. The cylindrical powder metallurgy product circumferential gate three-plate mold point injection structure according to claim 2, characterized in that: The product comprises a cylindrical barrel structure, a circular hole is arranged at the top center of the cylindrical barrel structure, and the peripheral side gate is butt-jointed with the circumferential position of the lower edge of the circular hole.

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