Injection mold for part with elastic sheet structure

Abstract

According to the injection mold for the part with the elastic piece structure, at least one upper mold core is arranged in an upper mold, a lower mold is correspondingly provided with a lower mold core matched with the upper mold core, the lower mold core comprises a main body block, the main body block is provided with inwards-concave forming cavities which are the first forming cavity and the second forming cavity respectively, and the first forming cavity and the second forming cavity are matched with each other. Two sets of protruding first bosses of the same structure are arranged in the second forming cavity, the front sides and the rear sides of the first bosses extend upwards to form forming strips in a protruding mode, the forming strips are the first forming strips and the second forming strips respectively, and the side walls, facing the second forming strips, of the first forming strips are first side wall forming faces of the elastic pieces; the segment difference between the first side wall forming face and the top end face of the first forming strip is smaller than or equal to 0.025 mm, and an arc part is arranged on the side, close to the end face of the first forming cavity, of the first forming strip. According to the injection mold provided by the utility model, the molding surface of the side edge of the elastic sheet is designed into a structure with segment difference, so that cracking caused by post-shrinkage deformation caused by internal stress after injection molding of the elastic sheet position of a product is effectively reduced, and the qualified rate of product production is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of molds, in particular to an injection mold for parts with spring-type structural parts. Background Art

[0002] Injection molds are specially used in the production of plastic products. The existing injection molds are used in the molding process as shown in the attached Figure 1 In the product (14) shown, the suspended spring piece (1401) in the middle is always prone to cracking at the connection between the spring piece (1401) and the product body, affecting the qualified rate of the product (14). Utility Model Content

[0003] The purpose of the utility model is to provide an injection mold for parts with spring structures, so as to solve the technical problems in the background technology.

[0004] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions:

[0005] An injection mold for parts with spring-type structural parts, comprising an upper mold and a lower mold, wherein at least one upper mold core is provided in the upper mold, and the lower mold core is correspondingly provided with a lower mold core cooperating with the upper mold core, and the lower mold core comprises a main body block, and the main body block is provided with an inwardly concave molding cavity, and the molding cavity is divided into two molding cavities from left to right, namely a first molding cavity and a second molding cavity, and the second molding cavity is provided with two groups of first bosses with the same structure, the first bosses correspond to the spring-type positions of the product, and the front and rear sides of the first bosses respectively extend upwards. There are forming strips, namely the first forming strip and the second forming strip, the first forming strip and the second forming strip have the same structure and are symmetrically arranged, the side wall of the first forming strip facing the second forming strip is the first side wall forming surface of the spring, the first side wall forming surface and the top surface of the first forming strip are non-vertical structures, the step difference between the first side wall forming surface and the top surface of the first forming strip is less than or equal to 0.025mm, and the first forming strip is provided with an arc portion on the side close to the end surface of the first forming cavity, and the radius of the arc portion is 0.8-0.85mm.

[0006] The upper mold consists of an upper heat insulation plate, an upper mold bottom plate, a runner plate and an upper mold plate from top to bottom. An upper mold cavity is provided in the upper mold plate for installing an upper mold core. Four groups of upper mold cores are installed in the upper mold cavity. The four groups of upper mold cores are arranged in a rectangular row.

[0007] The lower mold consists of a lower heat insulation plate, a lower mold bottom plate, a spacer block and a lower mold plate from bottom to top. The lower mold plate is provided with a lower mold cavity for installing a lower mold core. Four groups of lower mold cores are installed in the lower mold cavity to match the positions of the upper mold cores. The spacer block is supported between the lower mold plate and the lower mold bottom plate. A pin mechanism is also provided between the lower mold plate and the lower mold bottom plate for ejecting the molded products.

[0008] A gate sleeve is also installed on the upper mold base plate, and an annular positioning ring is provided on the top of the gate sleeve. The positioning ring is fixed to the upper mold base plate by bolts, and the lower end of the positioning ring rests on the gate sleeve.

[0009] Compared with the existing technology, the utility model provides an injection mold for parts with spring-type structural parts, which optimizes the lower mold core of the molding part of the spring and designs the side molding surface of the spring into a structure with a step difference, that is, the side of the spring has a certain slope structure, and the radius of the arc edge is also increased, which effectively reduces the post-shrinkage deformation and cracking caused by internal stress after injection molding of the spring position of the product, thereby ensuring the qualified rate of product production. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 : Structural diagram of the product injection molded in this application;

[0011] Figure 2 : A longitudinal half-section structural diagram of the present application;

[0012] Figure 3 : Top view of upper die;

[0013] Figure 4 : Top view of the lower mold;

[0014] Figure 5 : Three-dimensional view of the lower mold core;

[0015] Figure 6 : Top view of the lower mold core;

[0016] Figure 7 : Figure 6 Enlarged view of point A. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0018] Specific embodiment 1: Please refer to Figures 1 to 7This embodiment of the present invention relates to an injection mold for a part with a spring-loaded structure. The mold comprises an upper mold and a lower mold. The upper mold comprises, from top to bottom, an upper heat-insulating plate 1, an upper mold base plate 2, a runner plate 3, and an upper mold plate 4. The upper mold plate 4 defines an upper mold cavity for mounting upper mold cores 5. Four sets of upper mold cores 5 are mounted within the upper mold cavity, arranged in a rectangular array. A sprue bushing 6 is also mounted on the upper mold base plate 2. An annular retaining ring 7 is positioned at the top of the sprue bushing 6. The retaining ring 7 is bolted to the upper mold base plate, with the lower end of the retaining ring 7 resting against the sprue bushing 6. The sprue bushing 6 is made of SKD61 hot-working die steel, a material characterized by high temperature resistance and durability, effectively extending the service life of the sprue bushing 6.

[0019] The lower mold consists of a lower heat insulation board 8, a lower mold bottom plate 9, a spacer block 10 and a lower mold plate 12 from bottom to top. The lower mold plate 12 is provided with a lower mold cavity for installing a lower mold core 13. Four groups of lower mold cores 13 are installed in the lower mold cavity to match the position of the upper mold core 5. The spacer block 10 is supported between the lower mold plate 12 and the lower mold bottom plate 9. A pin mechanism 11 is also provided between the lower mold plate 12 and the lower mold bottom plate 9 for ejecting the molded product 14.

[0020] The lower mold core 13 includes a main body block 1301, which is provided with an inwardly concave molding cavity. The molding cavity is divided into two molding cavities from left to right, namely a first molding cavity 1302 and a second molding cavity 1303. The second molding cavity 1303 is provided with two groups of first protrusions 1304 with the same structure. The first protrusions 1304 correspond to the positions of the spring pieces of the product 14. The front and rear sides of the first protrusions 1304 extend upwards and protrude with molding strips, namely a first molding strip 1305 and a second molding strip 1306. The first molding strip 1305 and the second molding strip 1306 have the same structure and are symmetrically arranged. The first molding strip 1305 extends upwards and the second molding strip 1306 extends upwards. The side wall in the direction of the second molding strip 1306 is the first side wall molding surface of the spring. The first side wall molding surface and the top surface of the first molding strip 1305 are non-vertical structures. The step difference D1 between the first side wall molding surface and the top surface of the first molding strip 1305 is less than or equal to 0.025 mm. In this embodiment, the step difference D1 between the first side wall molding surface and the top surface of the first molding strip 1305 is 0.025 mm. The first molding strip 1305 is provided with an arc portion 1307 on the side close to the end surface of the first molding cavity 1302. The radius of the arc portion 1307 is 0.8-0.85 mm. In this embodiment, the radius of the arc portion 1307 is 0.8 mm.

[0021] Compared with the existing technology, the utility model provides an injection mold for parts with spring-type structural parts, which optimizes the lower mold core of the molding part of the spring and designs the side molding surface of the spring into a structure with a step difference, that is, the side of the spring has a certain slope structure, and the radius of the arc edge is also increased, which effectively reduces the post-shrinkage deformation and cracking caused by internal stress after injection molding of the spring position of the product, thereby ensuring the qualified rate of product production.

[0022] It will be apparent to those skilled in the art that the present invention is not limited to the details of the foregoing exemplary embodiments and that the present invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0023] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. An injection mold for a part with a spring structure, comprising an upper mold and a lower mold, characterized in that: At least one upper mold core is provided in the upper mold, and the lower mold is correspondingly provided with a lower mold core to cooperate with the upper mold core, and the lower mold core includes a main body block, and an inwardly concave molding cavity is provided on the main body block, and the molding cavity is divided into two molding cavities from left to right, namely a first molding cavity and a second molding cavity, and two groups of first bosses with identical structures are provided in the second molding cavity, and the first boss corresponds to the position of the spring piece of the product, and the front and rear sides of the first boss respectively extend upward with molding strips, which are the first molding strip and the second molding strip, and the first molding strip and the second molding strip have the same structure and are symmetrically arranged, and the side wall of the first molding strip facing the second molding strip is the first side wall molding surface of the spring piece, and the first side wall molding surface and the top surface of the first molding strip are non-vertical structures, and the step difference between the first side wall molding surface and the top surface of the first molding strip is less than or equal to 0.025mm, and the first molding strip is provided with an arc portion on the side close to the end surface of the first molding cavity, and the radius of the arc portion is 0.8-0.85mm.

2. The injection mold for a component with a spring structure according to claim 1, characterized in that: The upper mold consists of an upper heat insulation plate, an upper mold bottom plate, a runner plate and an upper mold plate from top to bottom. An upper mold cavity is provided in the upper mold plate for installing an upper mold core. Four groups of upper mold cores are installed in the upper mold cavity. The four groups of upper mold cores are arranged in a rectangular row.

3. The injection mold for a component with a spring structure according to claim 2, characterized in that: The lower mold consists of a lower heat insulation plate, a lower mold bottom plate, a spacer block and a lower mold plate from bottom to top. The lower mold plate is provided with a lower mold cavity for installing a lower mold core. Four groups of lower mold cores are installed in the lower mold cavity to match the positions of the upper mold cores. The spacer block is supported between the lower mold plate and the lower mold bottom plate. A pin mechanism is also provided between the lower mold plate and the lower mold bottom plate for ejecting the molded products.

4. The injection mold for a component with a spring structure according to claim 3, characterized in that: A gate sleeve is also installed on the upper mold base plate, and an annular positioning ring is provided on the top of the gate sleeve. The positioning ring is fixed to the upper mold base plate by bolts, and the lower end of the positioning ring rests on the gate sleeve.

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