Two-plate mold side glue feeding structure for circular powder metallurgy product outer part

Abstract

The utility model discloses a two-plate mold side glue feeding structure of a circular powder metallurgy product outer part. The two-plate mold side glue feeding structure comprises at least one mold cavity used for forming a product with a circular edge, glue injection runners extending to the mold cavities, and glue feeding ends arranged at the pouring gate positions of the glue injection runners, the glue inlet end comprises a first glue inlet part which is transited from the glue injection runner and expands towards the two sides in an arc shape, a step grain structure which is connected with the end opening of the first glue inlet part in the circumferential direction and is arranged in a step-by-step inward shrinkage manner, and a second glue inlet part which is arranged at the smallest end opening of the step grain structure; the two sides of the second glue feeding part are formed by the transition of the first glue feeding part from a step pattern structure, the port of the second glue feeding part is of an arc-shaped flat port structure, and the port of the second glue feeding part is in butt joint with the circular edge of the matched cavity. According to the utility model, the problem of black stripes is solved by optimizing the glue feeding mode.

Description

Technical Field

[0001] The utility model belongs to the technical field of glue-feeding structures, in particular to a glue-feeding structure on the sides of two-plate molds of a circular powder metallurgy product appearance part. Background Art

[0002] The black streak problem is a common problem in the powder metallurgy injection process and is also a relatively difficult problem to improve. It is related to many factors such as feeding, machine, injection process, product structure, and mold structure. In the conventional side gate injection method, black streaks are easily generated at the transition near the injection area. The main reason for the black streak is that the powder and the binder are separated due to excessive injection speed and shear force; the uneven distribution of powder concentration during the injection molding process causes black lines on the surface of the green product. Therefore, how to control the powder concentration distribution in the flow field and reduce black lines is a problem that needs to be solved for round appearance products. Utility Model Content

[0003] The purpose of the utility model is to solve the above technical problems and provide a two-plate mold side glue injection structure for round powder metallurgy product appearance parts, so as to improve the black streak problem by optimizing the glue injection method. In order to achieve the above purpose, the technical solution of the utility model is as follows:

[0004] The two-plate mold side glue injection structure of a circular powder metallurgy product appearance part includes at least one cavity for molding a product with a circular edge, a glue injection flow channel extending to each cavity, and a glue injection end arranged at the gate position of the glue injection flow channel; the glue injection end includes a first glue injection portion that transitions from the glue injection flow channel to expand in an arc shape on both sides, a step pattern structure that is circumferentially and gradually inwardly contracted at a port connecting the first glue injection portion, and a second glue injection portion that is arranged at the smallest port of the step pattern structure, the two sides of the second glue injection portion are formed by the first glue injection portion transitioning from the step pattern structure, the port of the second glue injection portion is an arc-shaped flat mouth structure, and the port of the second glue injection portion is butt-jointed with the circular edge of the matching cavity.

[0005] Specifically, the glue feeding structure is arranged in the mold, and the mold includes a lower mold core, an upper mold core corresponding to the lower mold core, side inserts that are movable and retractable on both sides of the lower mold core, and a group of upper inserts that pass through the upper mold core and are symmetrically arranged.

[0006] Specifically, the side inserts on both sides extend laterally into the cavity, and the side inserts on both sides are arranged in an aligned manner with respect to each other.

[0007] Specifically, the bottom ends of a group of the upper inserts extend to the top of the cavity, and the bottom ends of the upper inserts are provided with arc-shaped edges for molding the surface of the product.

[0008] Specifically, the glue inlet end is located in the horizontal direction of the center line of the cavity and between the side inserts on both sides.

[0009] Specifically, a plurality of first ejector pins and a plurality of second ejector pins for telescopically abutting against the product are arranged in the lower mold core.

[0010] Compared with the prior art, the beneficial effects of the two-plate mold side-injection structure of the circular powder metallurgy product appearance part of the utility model are mainly reflected in:

[0011] By optimizing the side glue injection method, a step pattern structure is set at the glue injection end to change the mold flow to avoid powder glue separation, improve the black mark problem, and greatly improve the appearance of the product surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structure of an embodiment of the utility model;

[0013] Figure 2 This is a schematic diagram of the structure of the glue inlet end in this embodiment;

[0014] Figure 3 This is a schematic diagram of the local structure of the upper insert in this embodiment;

[0015] The numbers in the figure represent:

[0016] 1 glue injection channel, 11 glue inlet end, 2 first glue inlet part, 21 step pattern structure, 22 second glue inlet part, 23 arc-shaped flat mouth structure, 3 lower mold core, 31 upper mold core, 32 side insert, 33 upper insert, 34 arc-shaped edge, 4 product, 41 arc-shaped dome, 42 ring, 43 connecting part, 5 first ejector pin, 51 second ejector pin. DETAILED DESCRIPTION

[0017] 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.

[0018] Example:

[0019] Reference Figure 1-3 As shown, this embodiment is a two-plate mold side injection structure for a circular powder metallurgy product appearance part, including at least one cavity for molding a product with a circular edge, a glue injection channel 1 extending to each cavity, and a glue injection end 11 arranged at the gate position of the glue injection channel 1; the glue injection end 11 includes a first glue injection portion 2 that transitions from the glue injection channel 1 to both sides and expands in an arc shape, a step pattern structure 21 that connects the port of the first glue injection portion 2 and is circumferentially and gradually inwardly contracted, and a second glue injection portion 22 that is arranged at the smallest port of the step pattern structure 21, the two sides of the second glue injection portion 22 are formed by the first glue injection portion 2 transitioning from the step pattern structure 21, the port of the second glue injection portion 22 is an arc-shaped flat mouth structure 23, and the port of the second glue injection portion 22 is docked to match the circular edge of the cavity.

[0020] The glue feeding structure is arranged in the mold, and the mold includes a lower mold core 3, an upper mold core 31 corresponding to the lower mold core 3, side inserts 32 that are movable and retractable on both sides of the lower mold core 3, and a group of upper inserts 33 that are symmetrically arranged and penetrate the upper mold core 31. The side inserts 32 on both sides extend laterally into the cavity, and the side inserts 32 on both sides are arranged in relative spacing and alignment. The bottom end of a group of upper inserts 33 extends to the top of the cavity, and the bottom end of the upper insert 33 is provided with an arc edge 34 for molding the surface of the product. The glue feeding end 11 is located in the horizontal direction of the center line of the cavity and between the side inserts 32 on both sides.

[0021] The product 4 includes an arc-shaped dome 41, a circular ring 42 arranged around the arc-shaped dome 41, and a group of connecting parts 43 arranged at the bottom of the inner cavity of the arc-shaped dome 41 and arranged symmetrically at intervals; a connecting hole is arranged in the connecting part 43. When the upper mold core 31 and the lower mold core 3 are molded together for glue injection, the side insert 32 is injected with glue to form the connecting hole, and the upper insert 33 is injected with glue to form the surface of the arc-shaped dome 41. The glue inlet end 11 is connected to the edge of the circular ring of the molded product 4, and other characteristic structural positions of the molded product in the mold cavity.

[0022] A plurality of first ejector pins 5 for telescopically abutting against the bottom end of the connecting portion and a plurality of second ejector pins 51 arranged circumferentially below the circular ring 42 for telescopically abutting against the bottom end of the circular ring 42 are arranged in the lower mold core 3 .

[0023] When this embodiment is used, the glue inlet end 11 injects glue into the cavity, and a group of upper inserts 33 and a group of side inserts 32 in the cavity cooperate to form a product.

[0024] In this embodiment, by optimizing the side glue feeding method, a step pattern structure 21 is provided at the glue feeding end 11 to change the mold flow to avoid the powder glue separation, improve the black mark problem, and greatly improve the appearance of the product surface.

[0025] 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.

[0026] 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. The two-plate mold side-injection structure of the circular powder metallurgy product appearance part is characterized by: It includes at least one mold cavity for molding a product with a circular edge, a glue injection channel extending to each mold cavity, and a glue feed end arranged at the gate position of the glue injection channel; the glue feed end includes a first glue feed portion that transitions from the glue injection channel to expand in an arc shape on both sides, a step pattern structure that is circumferentially and gradually inwardly contracted at a port connecting the first glue feed portion, and a second glue feed portion that is arranged at the smallest port of the step pattern structure, the two sides of the second glue feed portion are formed by the first glue feed portion transitioning from the step pattern structure, the port of the second glue feed portion is an arc-shaped flat mouth structure, and the port of the second glue feed portion docks and matches the circular edge of the mold cavity.

2. The two-plate mold side-injection structure for round powder metallurgy product appearance parts according to claim 1 is characterized by: The glue inlet structure is arranged in the mold, and the mold includes a lower mold core, an upper mold core corresponding to the lower mold core, side inserts arranged on both sides of the lower mold core and movable and retractable, and a group of upper inserts that penetrate the upper mold core and are symmetrically arranged.

3. The two-plate mold side-injection structure for round powder metallurgy product appearance parts according to claim 2 is characterized by: The side inserts on both sides extend laterally into the cavity, and the side inserts on both sides are arranged in an aligned manner with respect to each other.

4. The two-plate mold side-injection structure for round powder metallurgy product appearance parts according to claim 2 is characterized by: The bottom ends of a group of upper inserts extend to the top of the cavity, and the bottom ends of the upper inserts are provided with arc edges for molding the surface of the product.

5. The two-plate mold side-injection structure for round powder metallurgy product appearance parts according to claim 2 is characterized in that: The glue inlet end is located in the horizontal direction of the center line of the cavity and between the side inserts on both sides.

6. The two-plate mold side-injection structure for round powder metallurgy product appearance parts according to claim 2, characterized in that: The lower mold core is provided with a plurality of first ejector pins and a plurality of second ejector pins for telescopically abutting against the product.

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