Split type mold core and mold for injection molding of deep-hole thin-wall part

Abstract

The utility model discloses a split type mold core which comprises a locking sleeve and a mold core insert, the mold core insert comprises a bottom plate, a protruding core mold is arranged in the middle of the bottom plate, the locking sleeve and the bottom plate are locked through a locking screw, the top of the core mold penetrates through a cavity of the locking sleeve, and a plurality of positioning devices are further arranged between the locking sleeve and the bottom plate. The utility model further discloses a mold for injection molding of the deep-hole thin-wall part, a cavity is formed in the outer mold block, the top of the core mold is located in the cavity of the outer mold block, a gap between the core mold and the cavity is a forming gap, a protruding square boss is arranged at the bottom of the outer mold block, and a wear-resisting block is installed on the side wall of the square boss. The outer side wall of the wear-resisting block is attached to the inner side wall of the top of the locking sleeve. The core mold has the advantages that the locking sleeve and the mold core insert can be machined independently, the machining precision of the locking sleeve and the mold core insert is guaranteed, the assembling precision of the locking sleeve and the mold core insert can be guaranteed through the positioning device, and therefore eccentricity of the core mold is avoided.

Description

Technical Field

[0001] The utility model relates to the injection molding of deep hole thin wall parts, in particular to a split type core and a mold for the injection molding of deep hole thin wall parts. Background Art

[0002] As people pursue a high quality of life, people use more and more thin-walled injection molded parts in their daily lives. Thin-walled products have the advantages of reducing product weight and dimensions, facilitating integrated design and assembly, shortening injection molding cycle, saving raw materials and reducing costs, etc., which have become the goal pursued by the injection molding industry and a new research hotspot in the plastic molding industry. At present, all thin-walled products have very serious eccentricity. There is no quick solution to the problem of product injection eccentricity. The eccentricity problem is solved by repeatedly adjusting the size of the wear-resistant block, which invisibly increases the cost of mold manufacturing and injection molding commissioning, prolongs the mold delivery period, and the interchangeability of parts is not guaranteed, thereby increasing the cost of mold users and reducing product production capacity. After long-term research by the inventor, a mold for deep-hole thin-walled parts injection molding is proposed based on processing accuracy, processing difficulty and assembly accuracy. Utility Model Content

[0003] The utility model aims to overcome the disadvantages of the prior art and provide a split core and a mold for injection molding of deep-hole thin-walled parts.

[0004] The purpose of the utility model is achieved through the following technical scheme: a split core, including a locking sleeve and a core insert, the core insert includes a base plate, a raised core mold is arranged in the middle of the base plate, the locking sleeve and the base plate are locked by a locking screw, and the top of the core mold passes through the cavity of the locking sleeve, and a plurality of positioning devices are also arranged between the locking sleeve and the base plate.

[0005] Optionally, the positioning device includes a positioning column, a plurality of first positioning holes are formed at the bottom of the locking sleeve, a second positioning hole corresponding to the first positioning holes is formed on the bottom plate, the top of the positioning column is fitted and installed in the first positioning hole, and the top of the positioning column is fitted and installed in the second positioning hole.

[0006] Optionally, the second positioning hole is a stepped hole that is larger at the top and smaller at the bottom.

[0007] A mold for injection molding of deep-hole thin-walled parts includes a split core and an outer module. A cavity is opened in the outer module. The top of the core mold is located in the cavity of the outer module, and the gap between the core mold and the cavity is a molding gap. A raised square boss is provided at the bottom of the outer module. A wear-resistant block is installed on the side wall of the square boss. The outer wall of the wear-resistant block is in contact with the inner wall of the top of the locking sleeve.

[0008] Optionally, the side wall of the top inner cavity of the locking sleeve is a matching inclined surface inclined outward, and the outer side of the wear-resistant block is a wedge-shaped surface matching the matching inclined surface.

[0009] Optionally, the wear-resistant block is detachably connected to the side wall of the square boss by screws.

[0010] The utility model has the following advantages:

[0011] 1. The split core of the utility model, the locking sleeve and the core insert can be processed separately, which ensures the processing accuracy of the locking sleeve and the core insert, and the assembly accuracy of the locking sleeve and the core insert can be ensured by the positioning device, thereby avoiding the eccentricity of the core mold;

[0012] 2. Wear-resistant blocks are installed on the square bosses of the outer module, so that the wear-resistant blocks and the outer module can be processed separately, thereby ensuring the processing accuracy of the wear-resistant blocks and the outer module, and then ensuring the coaxiality of the cavity and the core mold installation, thereby ensuring the injection molding quality of deep-hole thin-walled parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the structure of the mold for injection molding of deep-hole thin-walled parts;

[0014] Figure 2 It is a cross-sectional schematic diagram of a mold for injection molding of deep-hole thin-walled parts;

[0015] Figure 3 It is a schematic diagram of the structure of the split core;

[0016] Figure 4 is a cross-sectional schematic diagram of a locking sleeve;

[0017] In the figure, 101-locking screw, 102-locking sleeve, 103-core insert, 104-first positioning hole, 105-positioning column, 106-second positioning hole, 107-outer module, 108-wear-resistant block, 109-square boss, 110-matching slope, 1031-base plate, 1032-core mold. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0019] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention.

[0020] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features thereof may be combined with each other.

[0021] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0022] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the utility model product is usually placed when in use, or the positions or positional relationships commonly understood by those skilled in the art, which are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0023] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] like Figure 1 and Figure 2As shown, a deep hole thin-walled part injection molding mold includes a split core and an outer mold block 107. In this embodiment, the split core includes a locking sleeve 102 and a core insert 103. The locking sleeve 102 and the core insert 103 are connected in a split manner, so the locking sleeve 102 and the core insert 103 can be processed separately. Moreover, after the locking sleeve 102 and the core insert 103 are processed separately, the locking sleeve 102 and the core insert 103 are not special-shaped parts, so their processing accuracy can be guaranteed. Compared with the existing integral core, its processing difficulty is small and the processing accuracy is high, thereby ensuring the assembly accuracy between the core mold 1032 and the cavity. In this embodiment, as shown in FIG. Figure 1 and Figure 3 As shown, the core insert 103 includes a base plate 1031, a raised core mold 1032 is arranged in the middle of the base plate 1031, the locking sleeve 102 and the base plate 1031 are locked by a locking screw 101, and the top of the core mold 1032 passes through the cavity of the locking sleeve 102, and a plurality of positioning devices are also arranged between the locking sleeve 102 and the base plate 1031, and the installation accuracy of the core mold 1032 and the locking sleeve 102 is guaranteed by the plurality of positioning devices, thereby ensuring the installation accuracy of the mold. Further, the positioning device includes a positioning column 105, a plurality of first positioning holes 104 are opened at the bottom of the locking sleeve 102, and a second positioning hole 106 corresponding to the first positioning hole 104 is opened on the base plate 1031, the top of the positioning column 105 is fitted in the first positioning hole 104, and the top of the positioning column 105 is fitted in the second positioning hole 106, preferably, at the four corners of the bottom of the locking sleeve 102 The first positioning hole 104 is provided. During installation, the positioning column 105 is first installed in the second positioning hole 106, and then the top of the positioning column 105 is installed on the locking sleeve 102, and finally the locking screw 101 is locked. Due to the positioning of the positioning column 105, during the locking process of the locking screw 101, there will be no misalignment between the locking sleeve 102 and the core insert 103, thereby avoiding the eccentricity of the core mold 1032. Furthermore, the second positioning hole 106 is a stepped hole with a larger top and a smaller bottom. The positioning column 105 is installed in the second positioning hole 106, and there is no need to worry about the positioning column 105 falling off. In the actual installation process, there is also a base under the bottom plate 1031, and a positioning piece is also installed in the small hole of the second positioning hole 106. The bottom of the positioning piece is installed on the base, so as to ensure the installation accuracy between the bottom plate 1031 and the base, and the locking screw 101 passes through the bottom plate 1031 and is locked with the base.

[0025] In this embodiment, a cavity is provided in the outer module 107, the top of the core mold 1032 is located in the cavity of the outer module 107, and the gap between the core mold 1032 and the cavity is a molding gap. A raised square boss 109 is provided at the bottom of the outer module 107, and a wear-resistant block 108 is installed on the side wall of the square boss 109. The outer wall of the wear-resistant block 108 is in contact with the inner wall of the top of the locking sleeve 102. In the prior art, the outer module 107 is an integral component, that is, there is a gap between the wear-resistant block 108 and the square boss 109. As a whole, the processing thereof is extremely difficult, especially the processing of the wedge-shaped surface of the wear-resistant block 108. Therefore, after assembly, the assembly accuracy of the cavity and the core mold 1032 is difficult to control. In the present embodiment, the wear-resistant block 108 and the outer module 107 can be processed separately, so that the processing of the outer module 107 is convenient, and the wear-resistant block 108 can be made of a different material from that of the outer module 107, that is, the wear-resistant block 108 can be made of existing wear-resistant materials, thereby increasing the service life and reducing the production cost.

[0026] In order to ensure the installation accuracy of the core mold 1032 and the cavity, Figure 4 As shown, the top inner cavity side wall of the locking sleeve 102 is an outwardly inclined mating bevel 110, and the outer side of the wear-resistant block 108 is a wedge-shaped surface matching the mating bevel 110. During installation, the wear-resistant block 108 fits with the mating bevel 110, so that the four sides of the outer module 107 are effectively limited, thereby ensuring the installation accuracy of the cavity, thereby ensuring the coaxial accuracy of the core mold 1032 and the cavity, and then making the core mold 1032 and the cavity non-eccentric, thereby ensuring the quality of injection molding of deep-hole thin-walled parts.

[0027] In this embodiment, the wear-resistant block 108 is detachably connected to the side wall of the square boss 109 by screws, so that the wear-resistant block 108 is replaceable. When the wear-resistant block 108 is worn, it only needs to be replaced.

[0028] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A split core, characterized in that: It includes a locking sleeve and a core insert, wherein the core insert includes a base plate, a raised core mold is arranged in the middle of the base plate, the locking sleeve and the base plate are locked by a locking screw, and the top of the core mold passes through the cavity of the locking sleeve, and a plurality of positioning devices are arranged between the locking sleeve and the base plate.

2. A split core according to claim 1, characterized in that: The positioning device includes a positioning column, a plurality of first positioning holes are formed at the bottom of the locking sleeve, a second positioning hole corresponding to the first positioning hole is formed on the bottom plate, the top of the positioning column is fitted and installed in the first positioning hole, and the top of the positioning column is fitted and installed in the second positioning hole.

3. A split core according to claim 2, characterized in that: The second positioning hole is a stepped hole that is larger at the top and smaller at the bottom.

4. A mold for injection molding of deep-hole thin-walled parts, characterized in that: The split core comprises the split core as described in any one of claims 1 to 3, and also comprises an outer module, wherein a cavity is formed in the outer module, the top of the core mold is located in the cavity of the outer module, and the gap between the core mold and the cavity is a molding gap, a raised square boss is provided at the bottom of the outer module, a wear-resistant block is installed on the side wall of the square boss, and the outer wall of the wear-resistant block is in contact with the inner wall of the top of the locking sleeve.

5. A deep hole thin-walled part injection mold according to claim 4, characterized in that: The side wall of the top inner cavity of the locking sleeve is a matching inclined surface inclined outward, and the outer side of the wear-resistant block is a wedge-shaped surface matching the matching inclined surface.

6. A deep hole thin wall part injection mold according to claim 4, characterized in that: The wear-resistant block is detachably connected to the side wall of the square boss via screws.

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