Lower injection mold for automobile parts

Abstract

The utility model relates to the technical field of injection molds, and provides a lower injection mold for automobile parts, which comprises a lower mold plate and is characterized in that a socket is mounted on the lower mold plate, the upper end of the socket protrudes out of the surface of a lower mold cavity to form a connecting ring, a lower positioning sleeve is in external threaded connection with the connecting ring, and a strip-shaped hole is formed in the side wall of the lower positioning sleeve. The strip-shaped holes are annularly distributed around the lower positioning sleeve, elastic arms are arranged in the strip-shaped holes, driving blocks extending inwards and elastic protruding blocks extending outwards are arranged at the roots of the elastic arms, and the inner side walls of the driving blocks are inclined planes; a positioning pin is arranged over the lower positioning sleeve and comprises a main body, a driving part and a guiding part which are coaxially connected from top to bottom, and the driving part is in a cone shape which is gradually shrunk from top to bottom. The utility model overcomes the defects in the prior art, is reasonable in design and compact in structure, and solves the technical problem of poor installation reliability of the existing injection molding finished product automobile part due to the position deviation of the embedded nut.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molds, and particularly relates to an injection mold lower die for automobile parts. Background Art

[0002] Some automobile parts will embed metal parts in the mold cavity before injection molding, such as ribs for increasing the strength of parts, nuts for connecting between components, and so on. Among them, the nuts are generally distributed at multiple points on the automobile parts. In the injection mold, the nuts are generally positioned by pins, but there is a gap between the pins and the nuts, which will cause poor position accuracy of the nuts on the injection-molded finished automobile parts, resulting in difficult installation of the automobile parts or arching and deformation after installation.

[0003] Therefore, we propose an injection mold lower die for automobile parts. Content of the Utility Model

[0004] (1) Technical Problems to be Solved

[0005] Aiming at the deficiencies of the prior art, the utility model provides an injection mold lower die for automobile parts, which overcomes the deficiencies of the prior art, has a reasonable design and a compact structure, and solves the technical problem of poor installation reliability of the existing injection-molded finished automobile parts due to the position deviation of the embedded nuts.

[0006] (2) Technical Solutions

[0007] To achieve the above purposes, the utility model is realized through the following technical solutions:

[0008] An injection mold lower die for automobile parts, including a lower template, characterized in that:

[0009] A socket is installed on the lower template, and the upper end of the socket protrudes from the surface of the lower mold cavity to form a connection ring. The connection ring is externally threaded with a lower positioning sleeve. A strip-shaped hole is opened on the side wall of the lower positioning sleeve, and a plurality of strip-shaped holes are distributed in a ring around the lower positioning sleeve. An elastic arm is arranged in the strip-shaped hole. The root of the elastic arm is provided with a driving block extending inwards and an elastic convex block extending outwards. The inner side wall of the driving block is an inclined surface;

[0010] A positioning pin is arranged directly above the lower positioning sleeve. The positioning pin is installed on the upper mold base and can penetrate the upper template downwards. The positioning pin includes a main body, a driving part and a guiding part coaxially connected from top to bottom. The driving part is a cone that gradually tapers from top to bottom;

[0011] During the process of inserting the positioning pin into the lower positioning sleeve, the driving part can extrude the driving block outwards, causing the elastic arm to turn outwards, and the elastic convex block to tightly press the embedded nut.

[0012] Furthermore, a connecting portion is provided at the top of the elastic arm, the width of the connecting portion is one third to one half of the width of the connecting arm body, and a notch is formed at the upper end of the connecting portion.

[0013] Furthermore, a positioning portion is formed on the inner side wall of the root of the elastic arm, and the driving block is plug-fitted with the positioning portion and locked by bolts.

[0014] Furthermore, the lower template is provided with a mounting hole that passes through from top to bottom, the upper end of the mounting hole is formed with a limiting flange extending inward, and the lower end thereof is encapsulated by a pressure plate, the socket is inserted into the mounting hole, the positioning step at the upper end of the socket is spliced ​​with the limiting flange, and the lower end thereof is tightened by the pressure plate.

[0015] Furthermore, the elastic protrusion is hemispherical.

[0016] Furthermore, a plurality of the elastic protrusions are distributed on the outer side wall of the root of the elastic arm.

[0017] (III) Beneficial effects

[0018] The utility model provides a lower mold for injection molding of automobile parts, which has the following beneficial effects: each embedded nut sleeve is arranged outside the lower positioning sleeve, and after the mold is closed, the positioning pin is inserted into the lower positioning sleeve, and through the cooperation of the driving part and the driving block, the elastic arms distributed on the lower positioning sleeve are synchronously turned outward and the embedded nuts are pressed against by elastic protrusions distributed at multiple points, thereby eliminating the gap between the lower positioning sleeve and the embedded nuts, and keeping the embedded nuts stable and not deviating, so as to ensure that the embedded nuts are accurately positioned on the injection molded product;

[0019] In addition, the positioning of each embedded nut is achieved through mold clamping drive, without the need to install other driving components, with a simple structure and low manufacturing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the utility model in the mold closing state;

[0021] Figure 2 It is a schematic diagram of the structure of the utility model in the mold opening state;

[0022] Figure 3 This is a schematic diagram of the structure of the socket, the lower positioning sleeve and the positioning pin in the utility model;

[0023] Figure 4 It is a structural schematic diagram of the combined state of the elastic arm and the driving block in the utility model;

[0024] Figure 5 It is a structural schematic diagram of the elastic arm and the driving block in the utility model in the exploded state.

[0025] In the figure:

[0026] 1. Upper template;

[0027] 1a. Upper mold cavity;

[0028] 2. Lower template;

[0029] 2a. Lower mold cavity;

[0030] 2b. Mounting hole;

[0031] 3. Injection mold cavity;

[0032] 4. Locating pin;

[0033] 4a. Main body;

[0034] 4b. Driving part;

[0035] 4c. Guiding part;

[0036] 5. Lower locating sleeve;

[0037] 5a. Slot;

[0038] 5b. Elastic arm;

[0039] 5b-1. Connecting part;

[0040] 5b-2. Notch;

[0041] 5b-3. Locating part;

[0042] 6. Socket;

[0043] 6a. Connecting ring;

[0044] 6b. Locating step;

[0045] 7. Pressure plate;

[0046] 8. First bolt;

[0047] 9. Elastic bump;

[0048] 10. Driving block;

[0049] 10a. Curved surface;

[0050] 10b. Locating hole;

[0051] 11. Second bolt. Detailed implementation method

[0052] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts shall fall within the protection scope of the present utility model.

[0053] Referring to the attached Figures 1-5 , an injection mold lower die for automotive parts, including a lower template 2, on which a lower mold cavity 2a is formed, which is combined with the upper mold cavity 1a of the upper template 1 to form an injection mold cavity 3 for the product;

[0054] A socket 6 is installed on the lower template 2. The upper end of the socket 6 protrudes from the surface of the lower mold cavity 2a to form a connecting ring 6a. The connecting ring 6a is externally threaded with a lower positioning sleeve 5. A vertically extending strip hole 5a is formed on the side wall of the lower positioning sleeve 5. A plurality of strip holes 5a are distributed in a ring around the lower positioning sleeve 5. An elastic arm 5b is provided in the strip hole 5a. The top of the elastic arm 5b is connected to the upper edge of the strip hole 5a. The root of the elastic arm 5b is provided with a driving block 10 extending inwards and an elastic convex block 9 extending outwards. The inner side wall of the driving block 10 is an inclined surface 10a with a curvature, which can better fit with the conical part of the positioning pin 4;

[0055] A positioning pin 4 is provided directly above the lower positioning sleeve 5. The positioning pin 4 is installed on the upper mold base and can penetrate the upper template 1 downwards. The positioning pin 4 includes a main body 4a, a driving part 4b and a guiding part 4c connected coaxially from top to bottom. The driving part 4b is a cone that tapers downwards;

[0056] During the process of inserting the positioning pin 4 into the lower positioning sleeve 5, the driving part 4b can extrude the driving block 10 outwards, causing the elastic arm 5b to turn outwards, and the elastic convex block 9 to press tightly against the embedded nut.

[0057] In this embodiment, the elastic arm 5b can be formed by a precision engraving machine on the side wall of the positioning sleeve. The top of the elastic arm 5b is provided with a connecting part 5b-1. The width of the connecting part 5b-1 is one-third to one-half of the width of the connecting arm main body 4a. A notch 5b-2 is formed at the upper end of the connecting part 5b-1 to reduce the thickness of the connecting part and facilitate elastic deformation and turning around the axis under force.

[0058] In this embodiment, a columnar and horizontally extending positioning portion 5b-3 is formed on the inner side wall of the root of the elastic arm 5b. The cross-section of the positioning portion 5b-3 is preferably polygonal, which can position the driving block 10 to prevent it from rotating. The positioning portion 5b-3 of the elastic arm 5b is inserted and matched with the positioning hole 10b of the driving block 10. After the second bolt 11 passes through the driving block 10, it is threadedly connected to the positioning portion to lock and fix the driving block 10.

[0059] In this embodiment, an installation hole 2b penetrating from top to bottom is formed on the lower template 2. A limiting flange extending inward is formed at the upper end of the installation hole 2b, and its lower end is sealed by a pressing plate 7. The [entity not clear in the original] is locked and fixed to the lower template 2 by a first bolt 8. The socket 6 is inserted into the installation hole 2b. The positioning step 6b at the upper end of the socket 6 is combined with the limiting flange, and its lower end is tightly pressed by the pressing plate 7.

[0060] In this embodiment, the elastic bump 9 is hemispherical. The elastic bump 9 is made of rubber and is vulcanized and bonded to the outer side wall of the root of the elastic arm 5b. After several elastic arms 5b turn outwards synchronously, multiple-point contact with the wall of the embedded nut can be formed. At the same time, a plurality of elastic bumps 9 are distributed at the roots of each elastic arm 5b, which can further increase the contact points and improve the stability of the embedded nut.

[0061] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of another identical element in the process, method, article or device including the said element.

[0062] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A lower mold for injection molding of automobile parts, comprising a lower mold plate, characterized in that: A socket is installed on the lower mold plate, the upper end of the socket protrudes from the surface of the lower mold cavity to form a connecting ring, the connecting ring is externally threadedly connected to a lower positioning sleeve, a strip hole is opened on the side wall of the lower positioning sleeve, and a plurality of strip holes are distributed in a ring shape around the lower positioning sleeve, an elastic arm is arranged in the strip hole, a driving block extending inwardly and an elastic protrusion extending outwardly are arranged at the root of the elastic arm, and the inner side wall of the driving block is an inclined surface; A positioning pin is provided just above the lower positioning sleeve, the positioning pin is installed on the upper die seat and can penetrate the upper die plate downwards, the positioning pin comprises a main body, a driving part and a guiding part coaxially connected from top to bottom, and the driving part is tapered from top to bottom; When the positioning pin is inserted into the lower positioning sleeve, the driving part can press the driving block outwards, so that the elastic arm is turned outwards, and the elastic protrusion presses the embedded nut tightly.

2. The lower mold for injection molding of automobile parts according to claim 1, characterized in that: A connecting portion is provided at the top of the elastic arm, the width of the connecting portion is one third to one half of the width of the connecting arm body, and a notch is formed at the upper end of the connecting portion.

3. The lower mold for injection molding of automobile parts according to claim 2, characterized in that: A positioning portion is formed on the inner side wall of the root of the elastic arm, and the driving block is plug-fitted with the positioning portion and locked by bolts.

4. The lower mold for injection molding of automobile parts according to claim 1, characterized in that: The lower template is provided with a mounting hole which passes through from top to bottom, the upper end of the mounting hole is formed with a limiting flange extending inward, and the lower end thereof is encapsulated by a pressing plate, the socket is inserted into the mounting hole, the positioning step at the upper end of the socket is spliced ​​with the limiting flange, and the lower end thereof is tightened by the pressing plate.

5. The lower mold for injection molding of automobile parts according to claim 1, characterized in that: The elastic protrusion is hemispherical.

6. The lower mold for injection molding of automobile parts according to claim 5, characterized in that: A plurality of elastic protrusions are distributed on the outer side wall of the root of the elastic arm.

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