Front core-pulling injection mold for rear mold insert

Abstract

The utility model discloses a rear mold insert first core-pulling injection mold which comprises a front mold, a rear mold and a rear mold insert first core-pulling mechanism, a front mold core and a rear mold core are arranged between the front mold and the rear mold, the rear mold insert first core-pulling mechanism comprises a rear mold insert, an elastic plate, a sliding block and a sliding block shovel base, the elastic plate is movably arranged at the bottom of the rear mold core, and the sliding block shovel base is arranged at the bottom of the rear mold core. A first spring is arranged between the elastic plate and the rear mold core, the rear mold insert is fixed on the elastic plate, and one end of the rear mold insert penetrates through the rear mold core and extends into the cavity; the sliding block is slidably mounted on the rear mold, and a second spring is arranged between the sliding block and the rear mold; the sliding block shovel base is fixedly installed on the front mold in the mold opening and closing direction, in the mold closing state, the sliding block shovel base is attached to the sliding block in a pressed mode, the sliding block is made to abut against the elastic plate, and at the moment, a gap is formed between the bottom of the elastic plate and the rear mold. According to the utility model, the rear mold insert is drawn out from the product before the product is ejected out, so that the situation of hole site mold drawing of the product caused by unbalanced ejection force is avoided, and the appearance quality of the product is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molds, in particular to an injection mold with a rear mold insert and a core-pulling method. Background Art

[0002] In the field of injection molding, mold design and performance play a key role in the quality, production efficiency, and cost control of plastic products. During the production process, when processing plastic products with special structures or complex shapes, it is often necessary to place inserts on the back mold to form features such as holes and grooves on the product. After the product is injected and cooled, the ejector mechanism of the injection mold can directly eject the product from the back mold.

[0003] However, when the product's outer surface is located on the rear mold and high quality requirements are placed on the product's appearance, it is not allowed to have too many ejector pins on the rear mold. This is because too many ejector pin marks will affect the product's aesthetics and result in substandard product quality. Furthermore, a small number of ejector pins can cause uneven ejection force after mold opening, which can easily lead to problems such as hole pull during production, affecting the product's aesthetics. Therefore, it is necessary to improve the existing technology to overcome its shortcomings. Utility Model Content

[0004] The problem to be solved by the utility model is to provide an injection mold with a rear mold insert and a core-pulling first, so as to overcome the defect of the existing injection mold that the product is prone to hole pulling due to unbalanced ejection force when the product is ejected.

[0005] The utility model adopts the following technical solution to solve its technical problems: a rear mold insert first core-pulling injection mold, comprising: a front mold and a rear mold, a front mold core and a rear mold core are arranged between the front mold and the rear mold, and a cavity for molding products can be formed between the front mold core and the rear mold core in a mold-closing state; the rear mold insert first core-pulling injection mold also includes a rear mold insert first core-pulling mechanism, and the rear mold insert first core-pulling mechanism includes a rear mold insert, a spring plate, a slider and a slider shovel base, the spring plate is movably arranged at the bottom of the rear mold core, and a first spring is arranged between the spring plate and the rear mold core, The rear mold insert is fixed on the spring plate and one end of which passes through the rear mold core and extends into the cavity; the slider is installed on the rear mold and can slide in a direction perpendicular to the mold opening and closing direction, and a second spring is provided between the slider and the rear mold, and the second spring is used to apply an elastic force to the slider in the direction away from the spring plate; the slider shovel base is fixedly installed on the front mold along the mold opening and closing direction, and in the mold closing state, the slider shovel base is pressed onto the slider and makes the slider abut against the spring plate, and at this time there is a gap between the bottom of the spring plate and the rear mold.

[0006] As a further improvement of the present invention, the rear mold is provided with a accommodating groove, in which the rear mold core and the spring plate are both accommodated; in the mold closing state, the slider abuts against the spring plate and forces the spring plate to abut against the bottom of the rear mold core; in the mold opening state, the spring plate abuts against the bottom wall of the accommodating groove under the elastic force of the first spring.

[0007] As a further improvement of the present invention, the rear mold is further provided with a slide groove at the bottom of the accommodating groove, and two slider strips are fixed in the slide groove. The slider is slidably installed in the slide groove, and the two slider strips are respectively pressed on both sides of the slider to limit the slider to slide only in a direction perpendicular to the opening and closing direction of the mold.

[0008] As a further improvement of the present invention, a wear-resistant block is fixedly installed in the slide groove, the slider is arranged on the wear-resistant block, and the end of the wear-resistant block away from the spring plate is provided with a limiting boss for stopping the slider.

[0009] As a further improvement of the present invention, a spring positioning groove is provided on one side of the slider, the second spring is accommodated in the spring positioning groove, and one end of the second spring is elastically placed on an inner side wall corresponding to the sliding groove.

[0010] As a further improvement of the present invention, the bottom of the slider shovel base is provided with a first bevel surface, and the slider is provided with a second bevel surface. In the mold closing state, the first bevel surface and the second bevel surface are in contact with each other.

[0011] As a further improvement of the present invention, the bottom of the spring plate is chamfered along the edge to form a third bevel surface, and the slider is provided with a fourth bevel surface. In the mold closing state, the third bevel surface and the fourth bevel surface fit together.

[0012] As a further improvement of the present invention, a plurality of guide rods are fixedly mounted on the spring plate, and the guide rods are slidably inserted into the guide holes on the rear mold core.

[0013] As a further improvement of the present invention, the slider, the slider shovel base and the second spring are each configured with two symmetrically distributed on both sides of the spring plate. In the mold closing state, the two sliders abut against the spring plate at the same time.

[0014] The beneficial effects of the present invention are as follows: the present invention provides an injection mold with a rear mold insert and a core-pulling method, which provides a rear mold insert at a hole position corresponding to the product on the rear mold core, and is used in conjunction with a slider shovel base and a slider. After the mold is opened and before the product is ejected, the front mold releases the restriction on the slider through the slider shovel base, and under the elastic force of the second spring, the slider slides to avoid the opening spring plate, and the rear spring plate drives the rear mold insert to be pulled out from the product first under the elastic force of the first spring, and finally the product is ejected by the ejector mechanism. This method can eject the product smoothly, and will not cause the product to have a hole position pulled out due to unbalanced ejection force, thereby ensuring the appearance quality of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a three-dimensional diagram of the injection mold with the rear mold insert first pulling the core in the present invention;

[0016] Figure 2 This is a cross-sectional view of the core-pulling injection mold for the rear mold insert of the utility model;

[0017] Figure 3 It is a three-dimensional diagram of the front mold core, the rear mold core and the rear mold insert core pulling mechanism in the present invention;

[0018] Figure 4 A three-dimensional diagram of the core-pulling mechanism for the rear mold insert in the present invention;

[0019] Figure 5 This is an exploded view of the core-pulling mechanism for the rear mold insert in the present invention.

[0020] The following description is made with reference to the accompanying drawings:

[0021] 1. Front mold; 2. Back mold; 3. Front mold core; 4. Back mold core; 5. Product; 6. Back mold insert; 7. Spring plate; 701, third bevel; 8. Slider; 801, second bevel; 802, fourth bevel; 9. Slider shovel base; 901, first bevel; 10. First spring; 11. Second spring; 12. Slider pressure strip; 13. Wear-resistant block; 1301, limit boss; 14. Guide rod. DETAILED DESCRIPTION

[0022] The preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0023] See Figures 1 to 5 The utility model provides a rear mold insert core-pulling injection mold, comprising: a top plate, a runner plate, a front mold 1, a rear mold 2, an ejector mechanism and a bottom plate arranged in sequence from top to bottom, a front mold core 3 and a rear mold core 4 are arranged between the front mold 1 and the rear mold 2, and in the mold closing state, a cavity for molding a product 5 can be formed between the front mold core 3 and the rear mold core 4.

[0024] As an important improvement of the present invention, the rear mold insert core-pulling injection mold also includes a rear mold insert core-pulling mechanism, which includes a rear mold insert 6, a spring plate 7, a slider 8 and a slider shovel base 9.

[0025] like Figure 2 As shown, the top of the rear mold 2 is provided with a receiving groove, in which the rear mold core 4 and the spring plate 7 are both accommodated. The rear mold core 4 is fixedly connected to the rear mold 2, while the spring plate 7 is movably arranged at the bottom of the rear mold core 4. That is, the spring plate 7 can move up and down in the gap between the rear mold core 4 and the rear mold 2 as the mold opens and closes.

[0026] In addition, a first spring 10 is provided between the spring plate 7 and the rear mold core 4 , and the first spring 10 is used to apply a downward elastic force to the spring plate 7 .

[0027] Furthermore, the rear mold insert 6 is fixed on the spring plate 7 and one end thereof passes through the rear mold core 4 and extends into the mold cavity for forming the hole on the product 5. The slider 8 is mounted on the rear mold 2 and can slide in a direction perpendicular to the mold opening and closing direction. A second spring 11 is provided between the slider 8 and the rear mold 2. The second spring 11 is used to apply an elastic force to the slider 8 in the direction away from the spring plate 7. The slider shovel base 9 moves in the mold opening and closing direction (with Figure 2 For reference, i.e., vertically, it is fixedly mounted on the front mold 1. In the mold closed state, the slider shovel base 9 is pressed against the slider 8, causing the slider 8 to abut against the spring plate 7, forcing the spring plate 7 to abut against the bottom of the rear mold core 4; at this time, there is a gap between the bottom of the spring plate 7 and the rear mold 2.

[0028] When the front mold 1 is opened, the front mold 1 drives the slider shovel base 9 to be pulled out from the rear mold 2. Since the slider shovel base 9 releases the pressure on the slider 8, the slider 8 slides in the horizontal direction opposite to the spring plate 7 under the elastic force of the second spring 11. At the same time, the spring plate 7 slides in the direction opposite to the rear mold core 4 (with the elastic force of the first spring 10). Figure 2 The spring plate 7 moves downward (for reference) and rests against the bottom wall of the accommodating groove. The spring plate 7 simultaneously drives the rear mold insert 6 to be pulled out from the product 5, and then the product 5 is ejected from the rear mold core 4 through the ejector mechanism.

[0029] When the mold is closed again, the front mold 1 drives the slider shovel base 9 to extend into the rear mold 2. The slider shovel base 9 presses the slider 8, forcing the slider 8 to slide horizontally toward the spring plate 7 for reset. At the same time, the slider 8 pushes the spring plate 7 to move upward until the front mold 1 and the rear mold 2 are completely closed. At this time, the first spring 10 and the second spring 11 are further compressed.

[0030] The utility model sets a rear mold insert 6 at the hole position corresponding to the product 5 on the rear mold core 4, and uses it in conjunction with a slider shovel base 9 and a slider 8. After the mold is opened and before the product 5 is ejected, the front mold 1 releases the restriction on the slider 8 through the slider shovel base 9, and under the elastic force of the second spring 11, the slider 8 slides to avoid the spring plate 7. The spring plate 7 drives the rear mold insert 6 to be pulled out from the product 5 under the elastic force of the first spring 10, and then the product is ejected by the ejector mechanism. This method can eject the product 5 smoothly, and will not cause the hole position of the product 5 to be pulled out due to unbalanced ejection force, thereby ensuring the appearance quality of the product 5.

[0031] See Figure 3 and Figure 4 In the present invention, two sliders 8, slider scoop bases 9, and second springs 11 are symmetrically distributed on both sides of the spring plate 7. In the mold closing state, the two slider scoop bases 9 are pressed against the two sliders 8 in a one-to-one correspondence, and the two sliders 8 are simultaneously in contact with the spring plate 7. By providing two sliders 8, two slider scoop bases 9, and two second springs 11, the present invention can improve the reliability and stability of driving the spring plate 7.

[0032] See Figure 2 and Figure 5 , the rear mold 2 is located at the bottom of the accommodating groove on both sides of the groove, two slider strips 12 are fixed in the two slide grooves, the slider 8 is slidably installed in the slide groove, and the two slider strips 12 are pressed on both sides of the slider 8 to limit the slider 8 to only move in the direction perpendicular to the direction of opening and closing the mold (with Figure 2 At the same time, the two slider strips 12 can also play a guiding role, making the movement of the slider 8 more stable and accurate.

[0033] Among them, the two sliders 8 are each provided with a spring positioning groove on the side facing each other, and the second spring 11 is accommodated in the spring positioning groove, and one end of the second spring 11 is elastically placed on an inner wall corresponding to the sliding groove, so that the second spring 11 can apply an elastic force to the slider 8 in the direction away from the spring plate 7.

[0034] In addition, wear-resistant blocks 13 are fixedly installed in both chutes, and the slider 8 is set on the wear-resistant blocks 13 to reduce the wear caused by the movement of the slider 8 and extend the service life of the mold. Figure 5 As shown, each end of the two wear-resistant blocks 13 away from the spring plate 7 (or the ends of the two wear-resistant blocks 13 facing away from each other) is provided with a stop boss 1301 for stopping the slider 8. In the mold open state, the two sliders 8 are stopped on the corresponding stop boss 1301 under the elastic force of their respective second springs 11.

[0035] See Figure 4 and Figure 5The inner side surface of the bottom of the slider shovel base 9 is provided with a first beveled surface 901, and the outer side surface of the slider 8 is provided with a second beveled surface 801. In the mold closing state, the first beveled surface 901 and the second beveled surface 801 are in contact with each other. During the mold closing process, the slider shovel base 9 relies on the cooperation between the first beveled surface 901 and the second beveled surface 801 to push the slider 8 to reset. The bottom of the spring plate 7 is chamfered along the edge to form a third beveled surface 701, and the top of the slider 8 is provided with a fourth beveled surface 802. In the mold closing state, the third beveled surface 701 and the fourth beveled surface 802 are in contact with each other. Similarly, during the mold closing process, the slider 8 relies on the cooperation between the fourth beveled surface 802 and the third beveled surface 701 to push the spring plate 7 to reset.

[0036] It is worth mentioning that two guide rods 14 are fixedly installed on the spring plate 7. The guide rods 14 are slidably inserted into the guide holes on the rear mold core 4 to guide the movement of the spring plate 7, making the movement of the spring plate 7 more stable and accurate.

[0037] It can be seen that the rear mold insert core-pulling injection mold of the present invention sets the rear mold insert 6 at the hole position corresponding to the product 5 on the rear mold core 4, and uses it in conjunction with the slider shovel base 9 and the slider 8. After the mold is opened and before the product 5 is ejected, the front mold 1 releases the restriction on the slider 8 through the slider shovel base 9, and under the elastic force of the second spring 11, the slider 8 slides to avoid the spring plate 7, and the spring plate 7 drives the rear mold insert 6 to be pulled out from the product 5 first under the elastic force of the first spring 10, and then the product is ejected through the ejector mechanism. This method can eject the product 5 smoothly, and will not cause the hole position of the product 5 to be pulled out due to unbalanced ejection force, thereby ensuring the appearance quality of the product 5.

[0038] In the above description, many specific details are set forth in order to fully understand the present invention. However, the above description is only a preferred embodiment of the present invention. The present invention can be implemented in many other ways different from those described herein, so the present invention is not limited by the specific implementation disclosed above. At the same time, any person skilled in the art can use the above-disclosed methods and technical contents to make many possible changes and modifications to the technical solution of the present invention without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of protection of the technical solution of the present invention.

Claims

1. A rear mold insert core-pulling injection mold, comprising a front mold (1) and a rear mold (2), wherein a front mold core (3) and a rear mold core (4) are provided between the front mold (1) and the rear mold (2), and in a mold-closing state, a cavity for molding a product (5) can be formed between the front mold core (3) and the rear mold core (4); characterized in that: The rear mold insert core-pulling injection mold further includes a rear mold insert core-pulling mechanism, the rear mold insert core-pulling mechanism includes a rear mold insert (6), a spring plate (7), a slider (8) and a slider shovel base (9), the spring plate (7) is movably arranged at the bottom of the rear mold core (4), and a first spring (10) is arranged between the spring plate (7) and the rear mold core (4), the rear mold insert (6) is fixed on the spring plate (7) and one end thereof passes through the rear mold core (4) and extends into the mold cavity; the slider (8) is installed on the rear mold (2) and can be moved along the vertical The slider (8) slides in the direction of mold opening and closing, and a second spring (11) is provided between the slider (8) and the rear mold (2), and the second spring (11) is used to apply an elastic force to the slider (8) in the direction opposite to the spring plate (7); the slider shovel base (9) is fixedly installed on the front mold (1) along the direction of mold opening and closing, and in the mold closing state, the slider shovel base (9) is pressed onto the slider (8) and makes the slider (8) abut against the spring plate (7), and at this time there is a gap between the bottom of the spring plate (7) and the rear mold (2).

2. The rear mold insert core-pulling injection mold according to claim 1, characterized in that: The rear mold (2) is provided with a receiving groove, and the rear mold core (4) and the spring plate (7) are both accommodated in the receiving groove; in the mold closing state, the slider (8) abuts against the spring plate (7) and forces the spring plate (7) to abut against the bottom of the rear mold core (4); in the mold opening state, the spring plate (7) abuts against the bottom wall of the receiving groove under the elastic force of the first spring (10).

3. The rear mold insert core-pulling injection mold according to claim 2, characterized in that: The rear mold (2) is located at the bottom of the accommodating groove and is further provided with a slide groove, in which two slider strips (12) are fixed, and the slider (8) is slidably installed in the slide groove, and the two slider strips (12) are respectively pressed on both sides of the slider (8) to limit the slider (8) to only slide in a direction perpendicular to the mold opening and closing direction.

4. The rear mold insert core-pulling injection mold according to claim 3, characterized in that: A wear-resistant block (13) is fixedly installed in the slide groove, the slider (8) is arranged on the wear-resistant block (13), and a limiting boss (1301) for stopping the slider (8) is provided at one end of the wear-resistant block (13) away from the spring plate (7).

5. The rear mold insert core-pulling injection mold according to claim 3, characterized in that: A spring positioning groove is provided on one side of the slide block (8), the second spring (11) is accommodated in the spring positioning groove, and one end of the second spring (11) is elastically placed on an inner side wall corresponding to the slide groove.

6. The rear mold insert core-pulling injection mold according to claim 1, characterized in that: The bottom of the slider shovel base (9) is provided with a first beveled surface (901), and the slider (8) is provided with a second beveled surface (801). In the mold closing state, the first beveled surface (901) and the second beveled surface (801) are in contact with each other.

7. The rear mold insert core-pulling injection mold according to claim 1, characterized in that: The bottom of the spring plate (7) is chamfered along the edge to form a third beveled surface (701), and the slider (8) is provided with a fourth beveled surface (802). In the mold closing state, the third beveled surface (701) and the fourth beveled surface (802) are in contact with each other.

8. The rear mold insert core-pulling injection mold according to claim 1, characterized in that: A plurality of guide rods (14) are fixedly mounted on the spring plate (7), and the guide rods (14) are slidably inserted into the guide holes on the rear mold core (4).

9. The rear mold insert core-pulling injection mold according to claim 1, characterized in that: The slider (8), the slider shovel base (9) and the second spring (11) are all configured with two symmetrically distributed on both sides of the spring plate (7). In the mold closing state, the two sliders (8) are simultaneously in contact with the spring plate (7).

Images