A molding die for irregular plastic parts

Abstract

The utility model relates to the field of injection mold discloses a kind of forming mould for irregular plastic parts, including back mould and front mould;The left side of the back mould is provided with a demoulding mechanism for being demoulded from pin end No.1, the middle part of back mould upper surface is equipped with the demoulding mechanism for being demoulded from protruding place No.2, the opposite side of the back mould and front mould is equipped with four evenly distributed guide posts;The No.1 demoulding mechanism includes the U-shaped block fixed in the left side of back mould, the left end of back mould and U-shaped block are all provided with ladder groove, and the inner cavity of ladder groove is movably provided with sliding part.The utility model, by being separated from the heterogeneous plastic part by the demoulding piece of being set, when the right end of guide hole and clamping block are pasted, the movement of No.1 sliding block can drive the movement of movable block, and movable block accurately transmits linear motion to inclined top plate assembly, so as to ensure that inclined top plate and heterogeneous plastic part are accurately separated, and realize stable and reliable demoulding action.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, specifically to a molding mold for irregular plastic parts. Background Technology

[0002] Injection molds are molding tools made of precision-machined steel. They inject molten plastic into a cavity under high temperature and pressure, and after cooling, a product of a specific shape is obtained. They are widely used in the automotive, home appliance, and electronics industries. Their core structure includes a moving mold, a fixed mold, and systems for gating, temperature control, and ejection. The molding process is divided into six categories: injection molding, compression molding, extrusion, blow molding, vacuum forming, and high-expansion polystyrene molding.

[0003] A search revealed Chinese patent CN218614931U, which discloses a plastic part molding die, including a moving die and a fixed die. The moving die and the fixed die are equipped with a product receiving mechanism. A T-shaped slide is fixedly set on one side of the fixed die, and a receiving box is installed on the T-shaped slide. When the moving die moves upward, it will drive the receiving box to the lower end of the product. When the product falls, it can fall into the receiving box. In addition, a rubber pad is installed in the receiving box to fully ensure the safety of the product. This method is labor-saving and very convenient.

[0004] The aforementioned utility model separates the moving mold from the fixed mold using conventional structures in the prior art. However, when manufacturing irregularly shaped plastic parts, which include insert ends, protrusions, and recesses, traditional injection molds have difficulty in injection molding them. Lateral protrusions or recesses are prone to interference with the mold during straight demolding, leading to scratches on the plastic parts or damage to the mold. Planar parting cannot adapt to complex curved surfaces or undercut features, requiring secondary manual processing, which reduces production efficiency. Based on this, a molding die for irregular plastic parts is proposed to solve the above problems. Utility Model Content

[0005] Based on the above description, this utility model provides a molding die for irregular plastic parts to solve the problem that when manufacturing irregular plastic parts, which include pin ends, protrusions, and recesses, traditional injection molds are difficult to use for injection molding. Lateral protrusions or recesses are prone to interference with the mold during straight demolding, resulting in damage to the plastic parts or the mold. Planar parting cannot adapt to complex curved surfaces or undercut features, requiring secondary manual processing, which reduces production efficiency.

[0006] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: a molding die for irregular plastic parts, including a rear die and a front die; The left side of the rear mold is provided with a first demolding mechanism for demolding from the pin end, the middle of the upper surface of the rear mold is provided with a second demolding mechanism for demolding from the protrusion, and four evenly distributed guide pillars are provided on the opposite side of the rear mold and the front mold. The first demolding mechanism includes a first U-shaped block fixed on the left side of the rear mold. A stepped groove is provided on the left end of the rear mold and on the first U-shaped block. A sliding component is provided in the inner cavity of the stepped groove. A limit block is fixed on the side of the inner top wall and the inner bottom wall of the stepped groove that are opposite to each other.

[0007] Through the above technical solution, the demolding component is separated from the irregular plastic part by the first slider. When the first slider is in contact with the card block at the right end of the guide hole, the movement of the first slider can drive the movement of the movable block. The movable block accurately transmits the linear motion to the inclined top plate assembly, thereby ensuring that the inclined top plate and the irregular plastic part are accurately separated, and achieving a stable and reliable demolding action.

[0008] Based on the above technical solution, the present invention can be further improved as follows.

[0009] Furthermore, the upper and lower limit blocks extend to the stepped groove on opposite sides, and the sliding member includes a first slider that is movably disposed in the stepped groove, with a demolding member provided on one side of the first slider.

[0010] Through the above technical solution, the sliding connection between the first slider and the stepped groove can remove the demolded part from the molding space of the irregular plastic part.

[0011] Furthermore, the cross-sectional shape of the first slider is T-shaped, and the two ends of the first slider move within the gap between the limiting block and the opposite side of the stepped groove.

[0012] Through the above technical solution, one end of the limiting block is inserted into the stepped groove and forms a gap with the stepped groove, thereby limiting both ends of the first slider, so that the first slider can only perform horizontal linear movement.

[0013] Furthermore, the demolding component includes a mounting groove formed on one side of the first slider, a movable block is provided in the mounting groove, a locking block is fixed on one side of the movable block with one end penetrating through the first slider and extending to the lower side of the first slider, and an inclined top plate is fixed on the right side of the bottom of the movable block. The front mold has a movable groove on its right end, which faces the rear mold.

[0014] The above technical solution enables the inclined top plate to be used for molding the pin ends of irregularly shaped plastic parts.

[0015] Furthermore, the size of the movable block is smaller than the size of the inner cavity of the mounting groove, and a guide hole is provided on the lower surface of the mounting groove. The locking block moves horizontally in the inner cavity of the guide hole, and the other end of the inclined top plate passes through the first slider and extends to the other side of the first slider.

[0016] The guide hole provided by the above technical solution can limit the movement of the card block.

[0017] Furthermore, the second demolding mechanism includes a second U-shaped block fixed in the middle of the upper surface of the rear mold, a second slider is movably arranged in the inner cavity of the second U-shaped block, a third slider is movably arranged on one side of the second slider, and an oblique groove is opened on the mold core of the rear mold and directly below the third slider. The top and middle sections of the second slider facing the third slider are respectively fixed with ball bearings and limiting shafts. The left and right ends and the middle section of the top of the third slider facing the second slider are respectively provided with two slots and sliding cavities.

[0018] Through the above technical solution, the sliding connection design between slider No. 2 and slider No. 3 realizes the staged demolding function. Slider No. 3 is driven to detach from the irregular plastic part. Then, under the linkage of slider No. 2, slider No. 3 moves out of the space above the workpiece, effectively releasing the spatial constraints of the workpiece, so that the operator can easily complete the removal of the irregular plastic part.

[0019] Furthermore, both the first and second sliders have inclined circular holes on one side, and the first and second U-shaped blocks have oblique holes. The inner cavities of the oblique holes and circular holes are movably connected to the same oblique guide post, and the other end of the oblique guide post is fixed to the front mold.

[0020] Through the above technical solution, the inclined guide post can drive the first and second sliders to move when the front mold moves, so that the first and second sliders move away from the workpiece, thereby completing the demolding.

[0021] Furthermore, a limiting block is fixed to the lower surface of the third slider and is movable in the inclined groove, and the other end of the limiting shaft moves horizontally in the sliding cavity.

[0022] Through the above technical solution, the setting of the limiting block can guide the movement of the third slider, and the setting of the limiting shaft can provide guidance for the third slider to move on the second slider.

[0023] Compared with the prior art, the technical solution of this application has the following beneficial technical effects: 1. The set demolding component separates from the irregular plastic part through the first slider. When it is in contact with the card block at the right end of the guide hole, the movement of the first slider can drive the movement of the movable block. The movable block accurately transmits the linear motion to the inclined top plate assembly, thereby ensuring that the inclined top plate and the irregular plastic part are accurately separated, and realizing a stable and reliable demolding action. 2. The sliding connection design between slider No. 2 and slider No. 3 enables a phased demolding function. Slider No. 3 is driven to detach from the irregular plastic part. Then, under the linkage of slider No. 2, slider No. 3 moves out of the space above the workpiece, effectively releasing the spatial constraints of the workpiece and enabling operators to easily complete the removal of irregular plastic parts. Attached Figure Description

[0024] Figure 1 A schematic diagram of the overall structure of a molding die for irregular plastic parts provided in an embodiment of this utility model; Figure 2 This is a schematic diagram of the structure of the rear mold and guide post in an embodiment of the present invention; Figure 3 This is a front view schematic diagram of the rear mold structure according to an embodiment of the present utility model; Figure 4 This is an enlarged structural diagram of embodiment A of the present invention; Figure 5 This is a side view of the structure of the rear mold in an embodiment of the present invention; Figure 6 This is a rear view schematic diagram of the structure of the front mold in an embodiment of this utility model; Figure 7 This is an enlarged structural diagram of section B in embodiment B of this utility model; Figure 8 This is a schematic diagram of the structure of slider No. 2 in Embodiment 2 of this utility model; Figure 9 This is a schematic diagram of the structure of slider No. 3 in embodiment of this utility model; Figure 10 This is a schematic diagram of the workpiece, the first demolding mechanism, and the second demolding mechanism in an embodiment of this utility model.

[0025] Reference numerals: 1. Rear mold; 2. Front mold; 3. Demolding mechanism No. 1; 31. U-shaped block No. 1; 32. Stepped groove; 33. Limiting block; 34. Sliding block No. 1; 35. Mounting groove; 36. Movable block; 37. Locking block; 38. Sloping top plate; 39. Movable groove; 4. No. 2 demolding mechanism; 41. No. 2 U-block; 42. No. 2 slider; 43. No. 3 slider; 44. Angled groove; 45. Ball bearing; 46. Limiting shaft; 47. Slot; 48. Sliding cavity; 5. Guide pillars. Detailed Implementation

[0026] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0028] Example: Reference Figure 1 and Figure 2 A molding die for irregular plastic parts includes a rear mold 1 and a front mold 2; a first demolding mechanism 3 for demolding from the pin end is provided on the left side of the rear mold 1, a second demolding mechanism 4 for demolding from the protrusion is provided in the middle of the upper surface of the rear mold 1, and four evenly distributed guide pillars 5 are provided on the opposite side of the rear mold 1 and the front mold 2.

[0029] refer to Figure 3 The first demolding mechanism 3 includes a first U-shaped block 31 fixed on the left side of the rear mold 1. A stepped groove 32 is provided on the left end of the rear mold 1 and the first U-shaped block 31. A sliding component is provided in the inner cavity of the stepped groove 32. A limit block 33 is fixed on the side of the inner top wall and the inner bottom wall of the stepped groove 32 that are opposite to each other.

[0030] The upper and lower limit blocks 33 extend into the stepped groove 32 on opposite sides. The sliding member includes a first slider 34 that is movably disposed in the stepped groove 32. A demolding member is provided on one side of the first slider 34. The cross-sectional shape of the first slider 34 is T-shaped. The two ends of the first slider 34 move in the gap between the limit blocks 33 and the opposite sides of the stepped groove 32, which can limit the movement direction of the first slider 34 in the vertical direction, so that it can only move in the horizontal direction.

[0031] refer to Figure 4 , Figure 5 , Figure 6 and Figure 10 The demolding component includes a mounting groove 35 on one side of the first slider 34, a movable block 36 is provided in the mounting groove 35, a locking block 37 is fixed on one side of the movable block 36 with one end passing through the first slider 34 and extending to the lower side of the first slider 34, and an inclined top plate 38 is fixed on the right side of the bottom of the movable block 36; a movable groove 39 is provided on the right end of the front mold 2 facing the rear mold 1.

[0032] It should be noted that one side of the movable groove 39 is a curved opening. When the front mold 2 and the rear mold 1 separate, the front mold 2 drives the movable groove 39 to move outside the locking block 37. At this time, the locking block 37 drives the movable block 36 and the inclined top plate 38 to remain stationary. When the curved opening of the movable groove 39 moves to the locking block 37, the locking block 37 can be released, and then the first slider 34 can drive the movable block 36 and the inclined top plate 38 to move.

[0033] Among them, the size of the movable block 36 is smaller than the size of the inner cavity of the mounting groove 35. The lower surface of the mounting groove 35 is provided with a guide hole. The locking block 37 moves horizontally in the inner cavity of the guide hole. The other end of the inclined top plate 38 passes through the first slider 34 and extends to the other side of the first slider 34.

[0034] During mold opening, the front mold 2 moves to one side of the rear mold 1. The movement of the front mold 2 drives the inclined guide post fixed to it to move, so that the first slider 34 moves away from the irregular plastic part under the action of the inclined guide post. While the first slider 34 moves, the movable block 36 inside it remains stationary. The movable groove 39 opened on the front mold 2 moves outside the locking block 37. When the first slider 34 moves, the guide hole on it also moves until the rightmost end of the guide hole is in contact with the locking block 37. At this time, the right side of the movable block 36 contacts the inner wall of the first slider 34. Then the first slider 34 can drive the movable block 36 to move. The movement of the movable block 36 can drive the inclined top plate 38 to move, so that the inclined top plate 38 can be separated from the molded irregular plastic part.

[0035] refer to Figure 7 , Figure 8 , Figure 9 and Figure 10 The second demolding mechanism 4 includes a second U-shaped block 41 fixed in the middle of the upper surface of the rear mold 1. A second slider 42 is movably arranged in the inner cavity of the second U-shaped block 41. A third slider 43 is movably arranged on one side of the second slider 42. An oblique groove 44 is opened on the mold core of the rear mold 1 and directly below the third slider 43. A ball bearing 45 and a limiting shaft 46 are fixed on the top and middle part of the side of the second slider 42 facing the third slider 43, respectively. Two slots 47 and sliding cavities 48 are opened on the left and right ends and the middle part of the top of the side of the third slider 43 facing the second slider 42, respectively.

[0036] The first slider 34 and the second slider 42 each have an inclined circular hole on one side. The first U-shaped block 31 and the second U-shaped block 41 have oblique holes. The oblique holes and the circular holes are connected by the same oblique guide post. The other end of the oblique guide post is fixed to the front mold 2. The lower surface of the third slider 43 has a limiting block that is movable in the oblique groove 44. The limiting block can guide the movement trajectory of the third slider 43. The other end of the limiting shaft 46 moves horizontally in the sliding cavity 48. The limiting shaft 46 ensures that the third slider 43 moves along the predetermined trajectory on the second slider 42.

[0037] In use, the front mold 2 is moved away from the rear mold 1. When the front mold 2 moves, it will drive the inclined guide post to move. The movement of the inclined guide post will cause the first slider 34 and the second slider 42 to move away from the irregular plastic part in the first U-shaped block 31 and the second U-shaped block 41, respectively. This will cause the demolding part, the second slider 42 and the third slider 43 to separate from the irregular plastic part, thus completing the demolding process. During the movement of the second slider 42, the third slider 43 first moves along the inclined groove 44 until the third slider 43 moves to one side of the inclined groove 44. The ball 45 on the second slider 42 corresponds to another slot 47 on the third slider 43. One end of the limiting shaft 46 moves in the sliding cavity 48. At this time, the third slider 43 moves along the movement trajectory of the second slider 42, so that the third slider 43 moves out of the space above the workpiece, which is convenient for picking up the molded irregular plastic part.

[0038] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A molding die for irregular plastic parts, comprising a rear die (1) and a front die (2); Its features are, The left side of the rear mold (1) is provided with a first demolding mechanism (3) for demolding from the pin end, and the middle of the upper surface of the rear mold (1) is provided with a second demolding mechanism (4) for demolding from the protrusion. Four evenly distributed guide pillars (5) are provided on the opposite side of the rear mold (1) and the front mold (2). The first demolding mechanism (3) includes a first U-shaped block (31) fixed on the left side of the rear mold (1). A stepped groove (32) is provided on the left end of the rear mold (1) and on the first U-shaped block (31). A sliding member is provided in the inner cavity of the stepped groove (32). A limit block (33) is fixed on the side opposite to the inner top wall and the inner bottom wall of the stepped groove (32).

2. The molding die for irregular plastic parts according to claim 1, characterized in that, The upper and lower limit blocks (33) extend to the stepped groove (32) on opposite sides. The sliding member includes a first slider (34) that is movably disposed in the stepped groove (32). A demolding member is provided on one side of the first slider (34).

3. The molding die for irregular plastic parts according to claim 2, characterized in that, The cross-sectional shape of the first slider (34) is T-shaped, and the two ends of the first slider (34) move in the gap between the limiting block (33) and the stepped groove (32) on opposite sides.

4. The molding die for irregular plastic parts according to claim 2, characterized in that, The demolding component includes a mounting groove (35) opened on one side of the first slider (34), a movable block (36) is provided in the mounting groove (35), a locking block (37) is fixed on one side of the movable block (36) with one end penetrating through the first slider (34) and extending to the lower side of the first slider (34), and an inclined top plate (38) is fixed on the right side of the bottom of the movable block (36). The front mold (2) has a movable groove (39) on the right end facing the rear mold (1).

5. The molding die for irregular plastic parts according to claim 4, characterized in that, The size of the movable block (36) is smaller than the size of the inner cavity of the mounting groove (35). A guide hole is provided on the lower surface of the mounting groove (35). The locking block (37) moves horizontally in the inner cavity of the guide hole. The other end of the inclined top plate (38) passes through the first slider (34) and extends to the other side of the first slider (34).

6. The molding die for irregular plastic parts according to claim 2, characterized in that, The second demolding mechanism (4) includes a second U-shaped block (41) fixed in the middle of the upper surface of the rear mold (1), a second slider (42) is movably arranged in the inner cavity of the second U-shaped block (41), a third slider (43) is movably arranged on one side of the second slider (42), and an oblique groove (44) is opened on the mold core of the rear mold (1) and located directly below the third slider (43); The top and middle parts of the second slider (42) facing the third slider (43) are respectively fixed with a ball (45) and a limiting shaft (46). The left and right ends and the middle part of the top of the third slider (43) facing the second slider (42) are respectively provided with two slots (47) and sliding cavities (48).

7. The molding die for irregular plastic parts according to claim 6, characterized in that, Both the first slider (34) and the second slider (42) have inclined circular holes on one side. The first U-shaped block (31) and the second U-shaped block (41) have oblique holes. The inner cavities of the oblique holes and the circular holes are equipped with the same oblique guide post. The other end of the oblique guide post is fixed to the front mold (2).

8. The molding die for irregular plastic parts according to claim 6, characterized in that, The lower surface of the third slider (43) is fixed with a limiting block that is movable in the inclined groove (44), and the other end of the limiting shaft (46) moves horizontally in the sliding cavity (48).

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