Precision mold with inner side back-off core-pulling mechanism

Abstract

A precision mold provided with an inner side back-off core-pulling mechanism belongs to the field of thermoplastic plastic forming molds, and realizes first separation of a fixed mold plate and a movable mold plate and later separation of the movable mold plate and a movable mold base plate by utilizing the matching effect of mold opening force and a damping pin, and drives a sliding connecting piece to move by utilizing the separation of the movable mold base plate so as to promote a sliding insert to return for core pulling. And the first core-pulling insert and the second core-pulling insert are separated from the inner side inverted buckle in a sliding manner, so that smooth demolding of the inner side inverted buckle of a product is realized, the mold space is saved, the mold cost is saved, the mold structure is simplified, the stability of the production process of a plastic product is ensured, the production efficiency is improved, and the reject ratio is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of thermoplastic molding molds and relates to a precision mold with an inner undercut core-pulling mechanism. It is mainly used in the demolding mechanism of plastic products with inner undercuts, especially in the demolding and mass production of multiple inner undercuts on core functional plastic products, ensuring the accuracy and size of the undercut parts of the plastic products. Background Technology

[0002] The trend of replacing steel with plastic has evolved from the early "passive substitution" to "active empowerment". More and more core functional components are using plastic products to replace metal parts. In order to make two or more parts firmly fixed together without the need for additional fasteners such as screws, multiple undercuts are often set in the inner cavity of the plastic product. Traditional mold structures are equipped with inclined ejectors or sliders to achieve undercut demolding. Inclined ejector demolding uses inclined movement to achieve the purpose of detaching from the undercut, which is subject to huge bending torque and is prone to wear, jamming and breakage in mass production. Slider demolding uses lateral movement to achieve the purpose of detaching from the undercut. Slider requires fixing and guiding components, which occupy a large mold space and increase the raw material and processing costs of the mold. Utility Model Content

[0003] The purpose of this invention is to provide a precision mold with an inner undercut core-pulling mechanism. Without the need for external force, the mold opening force during the injection molding process is used to drive the inner undercut core-pulling mechanism to operate, so as to achieve smooth demolding of the inner undercut of the plastic product and ensure the smooth production of the plastic product.

[0004] The technical problem to be solved by this utility model is to provide a precision mold with an inner undercut core-pulling mechanism, which solves the problems existing in the production process of plastic product molds with multiple undercuts on the inner side, ensures the shape and precision of the plastic product, and enables the plastic product to be successfully demolded and meet the technical and usage requirements.

[0005] The technical solution of this utility model is: a precision mold with an inner undercut core-pulling mechanism, the structure of which includes: a fixed template 1, a moving template 2, a moving mold pad 3, an ejector plate assembly 4, a fixed mold insert 5, a moving mold insert 6, a first moving mold insert 7, a first core-pulling insert 8, a sliding insert 9, a second core-pulling insert 10, a second moving mold insert 11, a sliding connector 12, a pad 13, a sliding pin 14, a plug 15, a precision guide post 16, a precision guide sleeve 17, a shoulder bolt 18, a damping pin 19, a first positioning assembly 20, a second positioning assembly 21, an ejector rod assembly 22, and a product 23;The connection relationships are as follows: When the moving mold plate 2 and the moving mold pad 3 are in the closed state, they are connected by guide pillars and guide sleeves; the ejector plate assembly 4 and the ejector rod assembly 22 are in clearance fit and limited by the mounting platform; the fixed mold insert 5 and the fixed mold plate 1 are in surface contact and limited, and are locked and fixed by bolts; the moving mold insert 6 and the moving mold plate 2 are in surface contact and limited, and are locked and fixed by bolts; the first moving mold insert 7 and the first core-pulling insert 8 are in surface contact and limited by the mounting platform; the first moving mold insert 7 and the moving mold insert 6 are in surface contact and limited by the mounting platform; the first core-pulling insert 8 and the sliding insert 9 are connected by a sliding groove and have a sliding fit; the first core-pulling insert 8 and the moving mold insert 6 are in surface contact and have a sliding fit; the second moving mold insert 11 and the moving mold insert... The six-sided contact is limited by the mounting platform. The second core-pulling insert 10 is slidably connected to the sliding insert 9 via a sliding groove. The second core-pulling insert 10 is slidably connected to the moving mold insert on six sides. The sliding insert 9 is slidably connected to the sliding connector 12 via a surface contact. The sliding pin 14 is slidably connected to the sliding connector 12 via a surface contact and is limited by the mounting platform. The threaded plug 15 is threadedly connected to the sliding connector 12. The threaded plug 15 is slidably connected to and limited by the sliding pin 14. The sliding insert 9 is provided with a semi-through groove. In the mold-closed state, the sliding pin 14 is in clearance fit with the semi-through groove on the sliding insert 9. In the mold-open state, the sliding pin 14 contacts and limits the semi-through groove on the sliding insert 9. The pad 13 is connected to the first moving mold insert. Mold insert 7, first core-pulling insert 8, second core-pulling insert 10, and second moving mold insert 11 are in surface contact and limited; pad 13 is in surface contact and sliding fit with sliding insert 9; pad 13 is in surface contact and limited with moving mold plate 2 and moving mold insert 6; precision guide post 16 is in surface contact and connected to and limited by fixed mold insert 5; precision guide sleeve 17 is in surface contact and connected to and limited by moving mold insert 6; precision guide post 16 and precision guide sleeve 17 are in surface contact and sliding fit; shoulder bolt 18 is clearance fit with moving mold plate 2; shoulder bolt 18 is threadedly connected to and fixed with moving mold pad 3; the distance between the mounting plate on shoulder bolt 18 and the countersunk hole on moving mold plate 2 is... The distance between the moving mold plate 2 and the moving mold pad 3 during mold opening is equal to the distance between them. The damping pin 19 is in surface contact with the moving mold plate 2 and is threadedly connected to and fixed to the moving mold pad 3. The first positioning component 20 is positioned between the moving mold plate 2 and the moving mold pad 3 for precise positioning. The second positioning component 21 is positioned between the fixed mold plate 1 and the moving mold plate 2 for precise positioning. The ejector pin assembly 22 has a clearance fit with the moving mold plate 2 and the moving mold pad 3. The ejector pin assembly 22 has a surface contact sliding fit with the moving mold insert 6, the first moving mold insert 7, and the second moving mold insert 11. The ejector pin assembly 22 has a clearance fit with the ejector pin plate assembly 4 and is connected by a mounting platform.

[0006] The sliding insert 9 is provided with a through groove, and the sliding connector 12 is provided with a boss. The through groove on the sliding insert 9 and the boss on the sliding connector 12 are limited by a plane and slide in cooperation.

[0007] The sliding insert 9 is provided with an inclined surface and a guide groove, the first core-pulling insert 8 is provided with an inclined surface and a guide platform, and the second core-pulling insert 10 is provided with an inclined surface and a guide platform. The guide groove provided on the sliding insert 9 is respectively limited and slidably engaged with the guide platforms provided on the first core-pulling insert 8 and the second core-pulling insert 10.

[0008] The sliding insert 9 has two semi-through grooves, so the assembly direction of the sliding connector 12 is not limited during assembly.

[0009] The beneficial effects of this utility model are as follows: The precision mold equipped with the inner undercut core-pulling mechanism utilizes the mold opening force and the damping pin 19 to achieve the separation of the fixed template 1 and the moving template 2 first, followed by the separation of the moving template 2 and the moving mold pad 3. The separation of the moving mold pad 3 drives the sliding connector 12 to move, causing the sliding insert 9 to retract and pull the core. The first core-pulling insert 8 and the second core-pulling insert 10 slide away from the inner undercut, realizing the smooth demolding of the inner undercut of the product, saving mold space, reducing mold costs, simplifying the mold structure, ensuring a stable plastic product production process, improving production efficiency, and reducing the defect rate. Attached Figure Description

[0010] The following description, in conjunction with the accompanying drawings, illustrates specific embodiments.

[0011] Figure 1 This is an assembly diagram of a precision mold equipped with an inner undercut core-pulling mechanism. Figure 1 .

[0012] Figure 2 This is an assembly diagram of a precision mold equipped with an inner undercut core-pulling mechanism. Figure 2 .

[0013] Figure 3 This is a cross-sectional view of the moving mold portion of a precision mold equipped with an inner undercut core-pulling mechanism. Figure 3 .

[0014] Figure 4 This is a schematic diagram of the moving mold component of a precision mold equipped with an inner undercut core-pulling mechanism. Figure 4 .

[0015] Figure 5 This is a schematic diagram of the moving mold component of a precision mold equipped with an inner undercut core-pulling mechanism. Figure 5 .

[0016] Figure 6 This is a schematic diagram of the sliding insert 9 of a precision mold equipped with an inner undercut core-pulling mechanism. Figure 6 .

[0017] Figure 7 This is a schematic diagram of the sliding connector 12 of a precision mold equipped with an inner undercut core-pulling mechanism. Figure 7 .

[0018] In the diagram: 1 Fixed mold plate; 2 Moving mold plate; 3 Moving mold pad; 4 Ejector plate assembly; 5 Fixed mold insert; 6 Moving mold insert; 7 First moving mold insert; 8 First core-pulling insert; 9 Sliding insert; 10 Second core-pulling insert; 11 Second moving mold insert; 12 Sliding connector; 13 Pad; 14 Sliding pin; 15 Plug; 16 Precision guide post; 17 Precision guide sleeve; 18 Shoulder bolt; 19 Damping pin; 20 First positioning assembly; 21 Second positioning assembly; 22 Ejector rod assembly; 23 Product. Detailed Implementation

[0019] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0020] The specific embodiments of the utility model are described in detail below with reference to the technical text and accompanying drawings.

[0021] This utility model is implemented in the mold structure assembly. The precision guide post 16 is installed in the stepped hole machined on the fixed mold insert 5, and is tightly fitted by the mounting plate. The fixed mold insert 5 is installed in the cavity machined on the fixed template 1. Bolts pass through the fixed mold insert 5 to lock and fix it to the fixed template 1. The first core-pulling insert 8 and the second core-pulling insert 10 are connected to the sliding insert 9 by a dovetail groove. The first core-pulling insert 8 is installed and the first moving mold insert 7 is limited by the mounting plate. The second core-pulling insert 10 is installed and the second moving mold insert 11 is installed and the mounting plate is limited. The first moving mold insert 7, the first core-pulling insert 8, the sliding insert 9, the second core-pulling insert 10, and the second moving mold insert 11 are installed as a whole in the cavity machined on the moving mold insert 6. The pad 13 is installed in the recessed platform machined on the moving mold insert 6 to limit the first moving mold insert 7 and the second moving mold insert 11. Bolts pass through the pad 13 to fix it on the moving mold insert 6 (e.g., Figure 3 and Figure 4 The precision guide sleeve 17 is fitted into the stepped hole machined on the moving mold insert 6, and is tightly fitted by the mounting plate; the sliding pin 14 is fitted into the countersunk hole machined on the sliding connector 12, and the plug 15 locks and fixes the sliding pin 14 (e.g. Figure 7 The sliding connector 12, sliding pin 14, and screw plug 15 are assembled as a whole with the sliding insert 9 (e.g., Figure 5The moving mold insert 6, the first moving mold insert 7, the first core-pulling insert 8, the sliding insert 9, the second core-pulling insert 10, the second moving mold insert 11, the sliding connector 12, and the pad 13 are assembled as a whole into the cavity machined in the moving mold plate 2. Bolts pass through the moving mold insert 6 to lock and fix it to the moving mold plate 2. The damping pin 19 is installed in the countersunk hole machined in the moving mold pad 3 and is locked and fixed by bolts passing through the damping pin 19. The two precision positioning components in the first positioning assembly 20 are respectively installed in the precision positioning countersunk holes machined in the moving mold plate 2 and the moving mold pad 3 and are locked by bolts. The two precision positioning components in the second positioning assembly 21 are respectively fitted into the precision positioning countersunk holes machined on the fixed template 1 and the moving template 2 and locked in place by bolts. The sliding connector 12 is fitted into the positioning cavity machined on the moving mold pad 3, and the bolts pass through the moving mold pad 3 to fix the sliding connector 12 to the moving mold pad 3. The ejector rod assembly 22 is fitted into the ejector rod hole machined on the ejector pin plate assembly 4. The ejector rod assembly 22 and the ejector pin plate assembly 4 are fitted together as a whole with the moving template 2, the moving mold pad 3, and the moving mold insert 6. The shoulder bolt 18 passes through the moving template 2 and is locked in place with the moving mold pad 3 (e.g., Figure 1 and Figure 2 ).

[0022] In the production of this precision mold with an inner undercut core-pulling mechanism, during the injection molding process, after injection molding is completed, when the mold is opened, under the action of the mold opening force and the damping pin 19, the fixed mold plate 1 and the moving mold plate 2 separate first, and the product 23 separates from the molding surface of the fixed mold insert 5. The moving mold plate 2 and the moving mold pad 3 then separate. The sliding connector 12 moves with the moving mold pad 3, and the sliding connector 12 drives the sliding insert 9 to move. The sliding insert 9 drives the first core-pulling insert 8 and the second core-pulling insert 10 to move towards each other, demolding the inner undercut part of the product 23. When the mounting platform set on the shoulder bolt 18 contacts the bottom surface of the countersunk hole set on the moving mold plate 2, the moving mold plate 2 and the moving mold pad 3 are relatively stationary, and the ejector rod group 22 ejects the product 23, completing the injection molding process.

[0023] The above description represents the superior embodiments of this utility model. It should be noted that, for those skilled in the art to which this utility model pertains, several improvements and modifications can be made without departing from the technical principles of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A precision mold equipped with an inner undercut core-pulling mechanism, the structure of which includes: Fixed mold plate (1), movable mold plate (2), movable mold pad (3), ejector plate assembly (4), fixed mold insert (5), movable mold insert (6), first movable mold insert (7), first core-pulling insert (8), sliding insert (9), second core-pulling insert (10), second movable mold insert (11), sliding connector (12), pad (13), sliding pin (14), plug (15), precision guide post (16), precision guide sleeve (17), shoulder bolt (18), damping pin (19), first positioning assembly (20), second positioning assembly (21), ejector rod assembly (22), product (23); characterized in that: the connection relationship is that the movable mold insert (6) and the movable mold plate (2) are in surface contact and Limiting and locking with bolts, the first moving mold insert (7) and the first core-pulling insert (8) are surface-to-surface contact limited by the mounting platform, the first moving mold insert (7) and the moving mold block (6) are surface-to-surface contact limited by the mounting platform, the first core-pulling insert (8) and the sliding insert (9) are connected by a sliding groove and are in sliding fit, the first core-pulling insert (8) and the moving mold block (6) are surface-to-surface contact and are in sliding fit, the second moving mold insert (11) and the moving mold block (6) are surface-to-surface contact limited by the mounting platform, the second core-pulling insert (10) and the sliding insert (9) are connected by a sliding groove and are in sliding fit, the second core-pulling insert (10) and the moving mold block (6) are surface-to-surface contact and are in sliding fit, the sliding insert (9) and the sliding connector (12) are in sliding fit, and the sliding pin (14) and the sliding... The connecting part (12) has a mounting platform for limiting contact. The plug (15) is threaded to the sliding connecting part (12). The plug (15) is in contact with and limits the sliding pin (14). The sliding insert (9) is provided with a semi-through groove. In the mold closed state, the sliding pin (14) and the semi-through groove provided on the sliding insert (9) are in clearance fit. In the mold open state, the sliding pin (14) and the semi-through groove provided on the sliding insert (9) are in contact and limit contact. The pad (13) is in contact with and limits the first moving mold insert (7), the first core-pulling insert (8), the second core-pulling insert (10), and the second moving mold insert (11). The pad (13) is in contact with and slides with the sliding insert (9). The pad (13) is in contact with the moving template (2) and the moving mold. The insert (6) is in contact with and limited, the precision guide post (16) is in contact with the fixed mold insert (5) and connected to the mounting platform and limited, the precision guide sleeve (17) is in contact with the moving mold insert (6) and connected to the mounting platform and limited, the precision guide post (16) and the precision guide sleeve (17) are in contact with each other and sliding fit, the shoulder bolt (18) is in clearance fit with the moving template (2), the shoulder bolt (18) is threadedly connected to and fixed with the moving mold pad (3), the distance between the mounting platform set on the shoulder bolt (18) and the countersunk hole set on the moving template (2) is equal to the distance between the moving template (2) and the moving mold pad (3) when the mold is opened and separated, the damping pin (19) is in contact with the moving template (2), and the damping pin (19) is threadedly connected to and fixed with the moving mold pad (3).

2. The precision mold with an inner undercut core-pulling mechanism according to claim 1, characterized in that: The first positioning component (20) is positioned between the moving template (2) and the moving template pad (3) and precisely positions the moving template (2) and the moving template pad (3). The second positioning component (21) is positioned between the fixed template (1) and the moving template (2) and precisely positions the fixed template (1) and the moving template (2).

3. The precision mold with an inner undercut core-pulling mechanism according to claim 1 or claim 2, characterized in that: The sliding insert (9) is provided with a through groove, and the sliding connector (12) is provided with a boss. The through groove on the sliding insert (9) and the boss on the sliding connector (12) are limited by a plane and slide together.

4. The precision mold with an inner undercut core-pulling mechanism according to claim 1 or claim 2, characterized in that: The sliding insert (9) is provided with an inclined surface and a guide groove, the first core-pulling insert (8) is provided with an inclined surface and a guide platform, and the second core-pulling insert (10) is provided with an inclined surface and a guide platform. The guide groove provided on the sliding insert (9) is respectively limited and slidably engaged with the guide platforms provided on the first core-pulling insert (8) and the second core-pulling insert (10).

5. The precision mold with an inner undercut core-pulling mechanism according to claim 1 or claim 2, characterized in that: The sliding insert (9) has two semi-through grooves, and the assembly direction of the sliding connector (12) is not limited during assembly.

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