Ejector-pin-free three-section demolding mold

Abstract

The utility model discloses a thimble-free three-section demoulding mould, which comprises a front mould and a rear mould, and is characterized by further comprising a push plate, a forming core, a forming ring and two oppositely arranged forming slide blocks, the push plate is positioned between the front mould and the rear mould, the forming core is fixed on the rear mould, an insert hole is arranged on the push plate, the forming ring is arranged on the forming core, and the two forming slide blocks are oppositely arranged. The forming core and the forming ring are both located in the insert hole, the forming sliding blocks are located on the two sides of the forming ring and can slide on the push plate, the forming sliding blocks are connected with the front mold through corresponding inclined ejection structures, and a first limiting structure capable of limiting the moving position of the forming ring in the mold opening direction is arranged between the forming ring and the forming core. A second limiting structure for limiting the moving position of the push plate in the mold opening direction is arranged between the push plate and the rear mold, the front mold and the push plate are temporarily connected together through a separable connecting piece, and the forming core, the forming ring, the front mold and the forming sliding block form a forming cavity.

Description

Technical Field

[0001] This utility model relates to a mold, and more particularly to a three-section ejector mold without ejector pins. Background Technology

[0002] A cylindrical shell with an annular step needs to be injection molded. The shell also has an annular groove inside. If a regular ejector pin is used during mold opening, the shell is very thin and the groove wall of the annular groove is tightly connected with the insert, so the ejector pin is easy to damage the shell.

[0003] Therefore, the applicant designed a three-section ejector mold without ejector pins to solve the above problems. Utility Model Content

[0004] In order to overcome the shortcomings of the existing technology, this utility model provides a three-section ejector mold without ejector pins.

[0005] The technical solution adopted by this utility model to solve its technical problem is:

[0006] A three-section ejector mold without ejector pins includes a front mold and a rear mold. It is characterized by further including a push plate, a forming core, a forming ring, and two opposing forming sliders. The push plate is located between the front and rear molds. The forming core is fixed to the rear mold. The push plate has insert holes. The forming ring is disposed on the forming core, and both the forming core and the forming ring are located within the insert holes. The forming sliders are located on both sides of the forming ring and can slide on the push plate. The forming sliders are connected to the front mold via corresponding inclined ejector structures. A limiting structure one is provided between the forming ring and the forming core to restrict the movement of the forming ring along the mold opening direction. A limiting structure two is provided between the push plate and the rear mold to restrict the movement of the push plate along the mold opening direction. The front mold and the push plate are temporarily connected together by separable connectors. The forming core, forming ring, front mold, and forming sliders constitute a forming cavity.

[0007] The limiting structure includes a step one disposed on the outer wall of the molding core and a step two disposed on the inner wall of the molding ring. The step two can abut against the step one to restrict the movement of the molding ring.

[0008] The bottom end of the forming ring is provided with an elastic ring, and the second step is composed of a portion of the elastic ring.

[0009] The second limiting structure includes a limiting rivet, the push plate is provided with a limiting hole, the bottom of the limiting hole is provided with a limiting protrusion ring, the upper end of the limiting rivet is located in the limiting hole and the rivet head of the limiting rivet can abut against the limiting protrusion ring.

[0010] It also includes a base plate and ejector plate one and ejector plate two. The rear mold is fixed to the base plate by a side plate. Ejector plate one and ejector plate two are fixed to the base plate. Ejector plate two is provided with a countersunk hole. The lower end of the limiting pull pin is provided with a countersunk in the countersunk hole. The countersunk is fixed by locking with ejector plate one and ejector plate two. The rear mold is provided with a through hole. The limiting pull pin passes through the through hole.

[0011] It also includes a spring, one end of which abuts against the push plate and the other end of which abuts against the ejector plate.

[0012] The inclined ejector structure includes an inclined ejector rod, an inclined sliding hole on the molding slider, an inclined countersunk hole on the front mold, and a rod cap at the end of the inclined ejector rod that engages with the countersunk hole.

[0013] The front mold has a front forming surface, which together with the forming core and the top surface of the forming ring forms a top cavity.

[0014] The inner wall of the molding ring is provided with two annular grooves that communicate with the outside. The annular grooves and the outer wall of the molding core form molding groove one, which communicates with the top cavity.

[0015] One side of the forming slider is provided with a semi-circular concave surface, and the concave surface is provided with two forming grooves that are open to the outside. The forming grooves and the outer wall of the forming ring form a second forming groove, which is open to the top cavity.

[0016] The beneficial effects of this utility model are: this utility model can form a three-stage demolding process without ejector pins, thereby ensuring that the product will not be damaged during demolding, meeting customer requirements, and improving product quality. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1 This is an overall structural view of the present invention when the mold is closed;

[0019] Figure 2 This is an internal structural view of the present invention when the mold is closed;

[0020] Figure 3 This is an exploded structural view of the present invention;

[0021] Figure 4 This is an overall structural view of the workpiece;

[0022] Figure 5 This is a structural view of the forming ring;

[0023] Figure 6 This is a structural view of the forming slider. Detailed Implementation

[0024] The advantages and features of this disclosure, as well as its implementation methods, will be illustrated by the following embodiments described with reference to the accompanying drawings. However, this disclosure may be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be comprehensive and complete, and will fully convey the scope of this disclosure to those skilled in the art. Furthermore, this disclosure is limited only by the scope of the claims.

[0025] The shapes, dimensions, scales, angles, and numbers disclosed in the accompanying drawings used to describe embodiments of this disclosure are merely examples, and therefore this disclosure is not limited to the details shown. Throughout this specification, the same reference numerals refer to the same elements. In the following description, detailed descriptions of relevant known functions or configurations will be omitted where it is determined that such detailed descriptions would unnecessarily obscure the focus of this disclosure. Where the terms “comprising,” “having,” and “including” are used in this specification, additional components may be added unless “only” is used. Unless otherwise indicated, singular terms may include plural forms.

[0026] When interpreting components, even if not explicitly described, the components are understood to include a range of tolerances.

[0027] When describing positional relationships, such as "on," "above," "below," and "adjacent to," one or more parts may be arranged between two other parts unless "immediately following" or "directly" is used.

[0028] When describing temporal relationships, such as when time sequence is described as “after,” “following,” “next,” and “before,” discontinuous cases may be included unless “exactly” or “directly” is used.

[0029] It should be understood that although the terms “first,” “second,” etc., may be used herein to describe various elements, these elements should not be limited by these terms. These terms are used only to distinguish one element from other elements. For example, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element, without departing from the scope of this disclosure.

[0030] As will be fully understood by those skilled in the art, the features of the different embodiments of this disclosure may be coupled or combined with each other in part or in whole, and may cooperate with each other and be technically driven in various ways. The embodiments of this disclosure may be implemented independently of each other, or may be implemented together in an interdependent relationship.

[0031] Reference Figures 1 to 6This utility model discloses a three-section ejector mold without ejector pins, including a front mold 1 and a rear mold 2, and further including a push plate 3, a forming core 4, a forming ring 5, and two oppositely arranged forming sliders 6. The push plate 3 is located between the front mold 1 and the rear mold 2. The forming core 4 is fixed on the rear mold 2. The push plate 3 is provided with insert holes 7. When the mold is closed, the forming ring 5 is set on the forming core 4, and both the forming core 4 and the forming ring 5 are located in the insert holes 7. When the mold is closed, the forming sliders 6 are located on both sides of the forming ring 5 and can slide on the push plate 3. The forming sliders 6 are connected to the front mold 1 through corresponding inclined ejector structures. A limiting structure one is provided between the forming ring 5 and the forming core 4 to limit the position of the forming ring 5 along the mold opening direction. A limiting structure two is provided between the push plate 3 and the rear mold 2 to limit the position of the push plate 3 along the mold opening direction. The front mold 1 and the push plate 3 are temporarily connected together by a separable connector. The forming core 4, the forming ring 5, the front mold 1, and the forming sliders 6 constitute a forming cavity.

[0032] As shown in the figure, the workpiece 8 to be injection molded in this application is a flat cylindrical shell with steps, having an open end. The shell has an annular partition plate 81 inside, and hollow holes 82 on the outer side wall of the shell. Therefore, the above-mentioned mold structure is adopted to realize the injection molding of this product. The specific molding structure is as follows: the front mold 1 is provided with a front molding surface (not shown in the figure), the front molding surface, the molding core 4, and the top surface of the molding ring 5 form a top cavity, which is used to mold the main body of the shell. The inner side wall of the molding ring 5 is provided with An annular groove 9, which is open to the outside on both sides, forms a first forming groove with the outer wall of the forming core 4. The first forming groove is open to the top cavity and is used to form the partition plate 81 of the workpiece 8. A semi-circular concave surface 10 is provided on one side of the forming slider 6. A forming groove 11, which is open to the outside on both sides, is provided on the concave surface 10. The forming groove 11 is open to the outside on both sides and forms a second forming groove with the outer wall of the forming ring 5. The second forming groove is open to the top cavity and is used to form the outer wall of the shell and the hollow hole 82.

[0033] The mold opening process of the above structure is briefly described as follows: During mold opening, the front mold 1 moves along the mold opening direction driven by the injection molding machine's drive mechanism. Because the push plate 3 is connected to the front mold 1 through a separable connector, the push plate 3 will move along with the molding slider 6 along with the front mold 1. The bottom surface of the molding groove 11 abuts against the bottom surface of the outer wall of the molding shell, causing the molding slider 6 to lift and move the workpiece 8, thereby separating the workpiece 8 from the molding core 4 and achieving a part of demolding. The bottom surface of the outer wall is in complete contact with the bottom surface of the molding groove 11, so the contact area is large. Moreover, the outer wall is sandwiched between the molding slider 6 and the molding ring 5, so it is not easily deformed. The molding ring 5 is embedded in the annular groove between the partition plate 81 and the outer wall of the shell. The workpiece 8 is tightly joined, so when the workpiece 8 moves, it will drive the forming ring 5 to move. After moving to a certain distance, the forming ring 5 is restricted from moving by the limiting structure one. However, the front mold 1, workpiece 8, push plate 3 and forming slider 6 continue to move. Therefore, during this movement, the workpiece 8 will separate from the forming ring 5 to achieve two-stage demolding. After moving to a certain distance again, the push plate 3 is restricted from moving by the limiting structure two. Therefore, the forming slider 6 cannot move along the mold opening direction. However, the front mold 1 continues to move. At this time, the front mold 1 separates from the push plate 3 and will drive the inclined ejector structure to make the forming slider 6 move in a direction perpendicular to the mold opening direction, thereby separating the forming slider 6 from the workpiece 8 to achieve three-stage demolding.

[0034] As shown in the figure, the limiting structure includes a step 12 on the outer wall of the molding core 4 and a step 2 on the inner wall of the molding ring 5. The step 2 abuts against the step 12 to restrict the movement of the molding ring 5. As a further structure, for ease of installation and manufacturing, the bottom end of the molding ring 5 is provided with an elastic ring 13. The step 2 is part of the elastic ring 13. Moreover, when the mold is closed, there is an annular pressing edge on the outer wall of the molding ring 5. When the mold is closed, the push plate 3 squeezes the pressing edge, causing the elastic ring 13 to be pressed tightly against the rear mold 2 and deformed. Thus, when the mold is opened, the elastic ring 13 will bounce up and push the molding ring 5 to move together with the push plate 3 in the mold opening direction, so that the molding ring 5 can also push the workpiece 8 to separate from the molding core 4. This not only increases the contact surface area but also increases the force application area on the workpiece 8, thereby ensuring that the workpiece 8 does not deform or get damaged when it separates from the molding core 4.

[0035] As shown in the figure, the second limiting structure includes a limiting pin 14, a limiting hole 15 on the push plate 3, a limiting protrusion ring at the bottom of the limiting hole 15, the upper end of the limiting pin 14 is located in the limiting hole 15 and the pin head of the limiting pin 14 can abut against the limiting protrusion ring, thereby limiting the movement of the push plate 3 by pulling the limiting pin 14. The specific installation structure of the limiting pull pin 14 includes a base plate 16, an ejector plate 17, and an ejector plate 2 18. The rear mold 2 is fixed to the base plate 16 via a side plate. The ejector plate 17 and ejector plate 2 18 are fixed to the base plate 16. The ejector plate 2 18 is provided with a countersunk hole. The lower end of the limiting pull pin 14 is provided with a countersunk head located in the countersunk hole. The countersunk head is fixed by locking it with the ejector plate 17 and ejector plate 2 18. The rear mold 2 is provided with a through hole, through which the limiting pull pin 14 passes. The above structure facilitates manufacturing, processing, and subsequent maintenance. As a further structure, a spring 19 is also included. One end of the spring 19 abuts against the push plate 3 and the other end of the spring 19 abuts against the ejector plate 18. Since the front mold 1 and the push plate 3 are temporarily connected together by a separable connector, which is a rubber plug 20 commonly used in the art, the two ends of the rubber plug 20 are tightly connected to the front mold 1 and the push plate 3 respectively, thus enabling separation. When the mold is just opened, the spring 19 assists the push plate 3 to move, preventing the push plate 3 from separating from the separable connector in advance.

[0036] As shown in the figure, the inclined ejector structure includes an inclined ejector rod 21, an inclined sliding hole 22 disposed on the forming slider 6, an inclined countersunk hole disposed on the front mold 1, and a rod cap at the end of the inclined ejector rod 21 that engages with the inclined countersunk hole. The inclined ejector rod 21 is in sliding engagement with the inclined sliding hole 22 and the inclined countersunk hole 24. Of course, the push plate 3 has a T-slot (not shown in the figure), and the bottom end of the forming slider 6 has a T-block 23 that is in sliding engagement with the T-slot. The above structure enables the front mold 1 to pull the inclined ejector rod 21, thereby causing the forming slider 6 to move perpendicular to the mold opening direction.

[0037] The above provides a detailed description of a pinless three-section demolding mold provided by the embodiments of this utility model. Specific examples have been used to illustrate the principle and implementation of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A three-section ejector mold without ejector pins, comprising a front mold and a rear mold, characterized in that: It also includes a push plate, a forming core, a forming ring, and two opposing forming sliders. The push plate is located between the front mold and the rear mold. The forming core is fixed on the rear mold. The push plate has insert holes. The forming ring is disposed on the forming core, and both the forming core and the forming ring are located in the insert holes. The forming sliders are located on both sides of the forming ring and can slide on the push plate. The forming sliders are connected to the front mold through corresponding inclined top structures. A limiting structure one is provided between the forming ring and the forming core to restrict the position of the forming ring along the mold opening direction. A limiting structure two is provided between the push plate and the rear mold to restrict the position of the push plate along the mold opening direction. The front mold and the push plate are temporarily connected together by separable connectors. The forming core, the forming ring, the front mold, and the forming sliders constitute a forming cavity.

2. The ejector pin-less three-section demolding mold according to claim 1, characterized in that: The limiting structure includes a step one disposed on the outer wall of the molding core and a step two disposed on the inner wall of the molding ring. The step two can abut against the step one to restrict the movement of the molding ring.

3. The ejector pin-less three-section demolding mold according to claim 2, characterized in that: The bottom end of the forming ring is provided with an elastic ring, and the second step is composed of a portion of the elastic ring.

4. The ejector pin-less three-section demolding mold according to claim 1, characterized in that: The second limiting structure includes a limiting rivet, the push plate is provided with a limiting hole, the bottom of the limiting hole is provided with a limiting protrusion ring, the upper end of the limiting rivet is located in the limiting hole and the rivet head of the limiting rivet can abut against the limiting protrusion ring.

5. A three-section ejector pinless demolding mold according to claim 4, characterized in that: It also includes a base plate and ejector plate one and ejector plate two. The rear mold is fixed to the base plate by a side plate. Ejector plate one and ejector plate two are fixed to the base plate. Ejector plate two is provided with a countersunk hole. The lower end of the limiting pull pin is provided with a countersunk in the countersunk hole. The countersunk is fixed by locking with ejector plate one and ejector plate two. The rear mold is provided with a through hole. The limiting pull pin passes through the through hole.

6. A three-section ejector pinless demolding mold according to claim 5, characterized in that: It also includes a spring, one end of which abuts against the push plate and the other end of which abuts against the ejector plate.

7. A three-section ejector pinless demolding mold according to claim 1, characterized in that: The inclined ejector structure includes an inclined ejector rod, an inclined sliding hole on the molding slider, an inclined countersunk hole on the front mold, and a rod cap at the end of the inclined ejector rod that engages with the countersunk hole.

8. A three-section ejector mold without ejector pins according to claim 1, characterized in that: The front mold has a front forming surface, which together with the forming core and the top surface of the forming ring forms a top cavity.

9. A three-section ejector pinless demolding mold according to claim 1, characterized in that: The inner wall of the molding ring is provided with two annular grooves that communicate with the outside. The annular grooves and the outer wall of the molding core form molding groove one, which communicates with the top cavity.

10. A three-section ejector pinless demolding mold according to claim 1, characterized in that: One side of the forming slider is provided with a semi-circular concave surface, and the concave surface is provided with two forming grooves that are open to the outside. The forming grooves and the outer wall of the forming ring form a second forming groove, which is open to the top cavity.

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