Injection mold

Abstract

The utility model discloses an injection mold which comprises a fixed mold and a movable mold, a female mold is arranged on the lower portion of the fixed mold, a male mold is arranged on the upper portion of the movable mold, the female mold and the male mold can be matched to form an injection molding cavity, a hot runner system is arranged in the fixed mold, a feeding port for an injection molding machine to inject molten plastic into the hot runner system is further formed in the fixed mold, and an ejector rod is connected in the movable mold in a sliding mode. An ejector plate capable of sliding relative to the movable die so as to drive the ejector rod is arranged on the movable die, a guide frustum is arranged on the female die, a guide groove matched with the guide frustum in shape is formed in the male die, and a wear-resistant block is arranged on the outer side wall of the guide frustum or the inner side wall of the guide groove. The product precision during injection molding can be ensured through the matching of the guide frustum and the guide groove, and meanwhile, the wear-resistant block is arranged on the outer side wall of the guide frustum or the inner side wall of the guide groove, so that the reduced mold precision can be slowed down through the wear-resistant block when the mold is subjected to opening and closing friction for a long time, and the quality requirement of the product can be ensured consistently.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molds, in particular to a high-precision injection mold. Background Art

[0002] Injection mold is a tool used for plastic injection molding. It has the advantages of high production efficiency, low cost and short production cycle, so it plays an important role in the production of plastic products. In the injection molding process, plastic particles are heated and melted by the injection molding machine and injected into the injection mold. Then the plastic is filled with the entire mold cavity by pressure and solidified after cooling. Finally, the mold is opened and the molded plastic product is taken out of the mold.

[0003] After the injection mold is used for a period of time, the transmission mechanism will continue to wear, which will cause the fit between the punch and the die to gradually deviate, thus affecting the quality of the injection molded product. How to keep the injection mold with good processing accuracy for a long time is a problem that technicians in this field have been exploring.

[0004] The utility model is made based on the above situation. Utility Model Content

[0005] The utility model overcomes the shortcomings of the prior art and provides an injection mold, which can maintain its processing accuracy for a long time, thereby improving its product quality.

[0006] The utility model is realized by the following technical solutions:

[0007] An injection mold comprises a fixed mold and a movable mold, wherein a concave mold is provided at the lower part of the fixed mold, and a convex mold which can be moved toward the concave mold is provided at the upper part of the movable mold, and the concave mold and the convex mold can cooperate to form an injection cavity, and a hot runner system for conveying molten plastic to each injection cavity is provided in the fixed mold, and a feed port for an injection molding machine to inject molten plastic into the hot runner system is also provided on the fixed mold, and a push rod which can extend from the convex mold to demould the product is slidably connected in the movable mold, and a push pin plate which can slide relative to the movable mold to drive the push rod is also provided on the movable mold, and a guide cone is provided on the concave mold, and a guide groove matching the shape of the guide cone is provided on the convex mold, and a wear-resistant block is provided on the outer side wall of the guide cone or the inner side wall of the guide groove.

[0008] In an injection mold as described above, the upper end of the ejector rod is provided with a conical ejector head with a large top and a small root, the punch is provided with a sliding hole for the ejector rod to slide, and an embedding groove matching the shape of the ejector head is provided at the corresponding sliding hole opening on the punch.

[0009] In the injection mold as described above, a spiral groove for adding lubricating oil is provided on the outer side wall of the ejector rod.

[0010] In the injection mold as described above, a water transport channel is provided inside the ejector pin for transporting cooling liquid to the upper end of the ejector pin.

[0011] In the injection mold as described above, the fixed mold is provided with a first cooling water channel capable of cooling the concave mold, and the movable mold is provided with a second cooling water channel capable of cooling the convex mold.

[0012] As described above, in an injection mold, the hot runner system includes a hot runner plate arranged on a fixed mold and a discharge nozzle for injecting molten plastic into an injection cavity, a diverter groove is arranged on the hot runner plate, and a material transport channel is arranged between the diverter groove and the discharge nozzle for transporting the molten plastic in the diverter groove into the discharge nozzle.

[0013] In the injection mold as described above, the ejector plate is provided with a third cooling water channel for inputting cooling water into the water transport channel.

[0014] In the injection mold as described above, the fixed mold is provided with a guide hole, and the movable mold is provided with a guide column that can guide the movement of the movable mold.

[0015] In the injection mold as described above, a plurality of concave molds are distributed in an array at the bottom of the fixed mold, and a plurality of convex molds are distributed in an array at the top of the movable mold.

[0016] In the injection mold as described above, the movable mold and the ejector plate are both driven to rise and fall by the jacking mechanism.

[0017] Compared with the prior art, the utility model has the following advantages:

[0018] 1. A guide cone is provided on the die, and a guide groove matching the shape of the guide cone is provided on the punch. When the punch moves toward the die, the guide cone cooperates with the guide groove to ensure the product accuracy during injection molding. At the same time, a wear-resistant block is provided on the outer wall of the guide cone or the inner wall of the guide groove. The wear-resistant block can ensure that the mold accuracy is reduced after a long period of opening and closing friction, so that the product can consistently meet the quality requirements.

[0019] 2. The upper end of the ejector rod is provided with a conical ejector head with a large top and a small root, thereby increasing the contact area with the product and not easily damaging the product when it is lifted; an embedding groove matching the shape of the ejector head is provided at the corresponding sliding hole opening on the punch, so that the ejector head is embedded in the embedding groove, reducing the impact of the ejector head on the injection molded product, and at the same time limiting the molten plastic from flowing into the sliding hole from the gap between the ejector head and the embedding groove.

[0020] 3. A spiral groove is provided on the outer wall of the ejector rod, through which lubricating grease can be added between the sliding hole and the outer wall of the ejector rod to prevent friction loss or damage to the ejector rod caused by long-term movement.

[0021] 4. A water channel is provided inside the ejector pin for conveying coolant to the upper end of the ejector pin, thereby accelerating the cooling and shaping of the injection molded product.

[0022] 5. The fixed mold is provided with a first cooling water channel for cooling the concave mold, and the movable mold is provided with a second cooling water channel for cooling the convex mold, thereby accelerating the cooling and shaping of the injection molded product and improving the processing efficiency.

[0023] 6. The lower array of the fixed mold is distributed with multiple concave molds, and the upper array of the movable mold is distributed with multiple convex molds, thereby forming multiple injection cavities for injection molding products, increasing the number of injections in a single injection molding, and improving processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings, wherein:

[0025] Figure 1 It is a structural schematic diagram of the utility model;

[0026] Figure 2 It is a cross-sectional view of the utility model;

[0027] Figure 3 It is an exploded schematic diagram of the utility model;

[0028] Figure 4 It is a structural schematic diagram of the movable mold in the utility model;

[0029] Figure 5 It is a structural schematic diagram of the punch in the utility model;

[0030] Figure 6 It is a structural schematic diagram of multiple concave molds and the first cooling water channel in the utility model;

[0031] Figure 7 It is a structural schematic diagram of the concave mold in the utility model;

[0032] Figure 8 It is a structural schematic diagram of the ejector rod in the utility model;

[0033] Fig. 9 It is a schematic diagram of the structure of the hot runner plate in the utility model;

[0034] Fig.10 yes Figure 2 Enlarged view of part A in the middle. DETAILED DESCRIPTION

[0035] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods:

[0036] like Figures 1 to 10An injection mold shown in the figure comprises a fixed mold 1 and a movable mold 2, wherein a concave mold 3 is provided at the lower part of the fixed mold 1, and a convex mold 4 which can be moved toward the concave mold 3 is provided at the upper part of the movable mold 2, and the convex mold 4 is driven to move by the movable mold 2, and the concave mold 3 and the convex mold 4 can cooperate to form an injection cavity 5, a hot runner system for conveying molten plastic to each injection cavity 5 is provided in the fixed mold 1, and a feed port 11 for the injection molding machine to inject molten plastic into the hot runner system is also provided on the fixed mold 1, a push rod 61 which can extend from the convex mold 4 to demould the product is slidably connected in the movable mold 2, and a push pin plate 62 which can slide relative to the movable mold 2 to drive the push rod 61 is also provided on the movable mold 2, a guide cone 31 is provided on the concave mold 3, and a guide groove 41 whose shape matches that of the guide cone 31 is provided on the convex mold 4, and a wear-resistant block 311 is provided on the outer wall of the guide cone 31 or the inner wall of the guide groove 41.

[0037] When the punch 4 moves toward the die 3, the guide cone 31 cooperates with the guide groove 41 to ensure the product accuracy during injection molding. At the same time, a wear-resistant block 311 is provided on the outer wall of the guide cone 31 or the inner wall of the guide groove 41. The wear-resistant block 311 can ensure that the mold accuracy is reduced after a long period of opening and closing friction, so that the product can consistently meet the quality requirements.

[0038] In one embodiment, the guide cone 31 is integrally formed with the die 3, the cavity of the die 3 is arranged on the guide cone 31, and the end of the guide cone 31 is opened. The convex part of the injection cavity 5 formed by the punch 4 and the cavity of the die 3 is arranged in the guide groove 41, and the guide groove 41 surrounds the convex part. The wear-resistant block 311 can be NM500 wear-resistant steel plate, 37SiMn2MoV wear-resistant plate, 65mn60Si2Mn alloy steel plate, etc., and of course it can also be a wear-resistant block 311 made of other wear-resistant materials.

[0039] In one embodiment, the wear block 311 is connected to the guide cone 31 or the guide groove 41 by threaded fasteners. Of course, the wear block 311 can also be connected to the guide cone 31 or the guide groove 41 by other connection methods such as welding. The female mold 3 is connected to the fixed mold 1 by threaded fasteners, and the male mold 4 is connected to the movable mold 2 by threaded fasteners. Of course, the female mold 3 can also be connected to the fixed mold 1 by other connection methods, and the male mold 4 can also be connected to the movable mold 2 by other connection methods.

[0040] The upper end of the ejector pin 61 is provided with a conical ejector head 611 with a large top and a small root, thereby increasing the contact area with the product and preventing the product from being damaged when being lifted. The punch 4 is provided with a sliding hole 42 for the ejector pin 61 to slide, and the punch 4 is provided with an embedding groove 43 matching the shape of the ejector head 611 at the opening of the corresponding sliding hole 42, so that the ejector head 611 is embedded in the embedding groove 43, reducing the impact of the ejector head 611 on the injection molded product, and at the same time limiting the molten plastic from flowing into the sliding hole 42 from the gap between the ejector head 611 and the embedding groove 43, thereby causing the ejector pin 61 to be stuck.

[0041] In one embodiment, the ejector head 611 may be connected to the ejector rod 61 by welding, or may be integrally formed with the ejector rod 61. Of course, the ejector head 611 may also be connected to the ejector rod 61 by other means such as threaded connection.

[0042] A spiral groove 612 for adding lubricating oil is provided on the outer wall of the push rod 61. Lubricating grease can be added between the sliding hole 42 and the outer wall of the push rod 61 through the spiral groove 612 to prevent friction loss or damage to the push rod 61 caused by long-term movement.

[0043] The ejector pin 61 is provided with a water channel 613 for delivering cooling liquid to the upper end of the ejector pin 61, and the ejector plate 62 is provided with a third cooling water channel 614 for inputting cooling water into the water channel 613, thereby accelerating the cooling and shaping of the injection molded product. The water channel 613 may be a stainless steel water pipe built into the ejector pin 61.

[0044] The fixed mold 1 is provided with a first cooling water channel 71 capable of cooling the concave mold 3, and the movable mold 2 is provided with a second cooling water channel 72 capable of cooling the convex mold 4, thereby accelerating the cooling and shaping of the injection molded product and improving the processing efficiency.

[0045] In one embodiment, the first cooling water channel 71 , the second cooling water channel 72 , and the third cooling water channel 614 can all be connected to a cooling water network for water inlet.

[0046] The lower array of the fixed mold 1 is distributed with a plurality of concave molds 3, and the upper array of the movable mold 2 is distributed with a plurality of convex molds 4, thereby forming multiple injection cavities 5 for injection molding products, increasing the injection quantity during a single injection molding, and improving processing efficiency.

[0047] The hot runner system includes a hot runner plate 81 disposed on the fixed mold 1 and a discharge nozzle 82 for injecting molten plastic into the injection cavity 5. The hot runner plate 81 is provided with a diverter groove 811. A material transport channel 812 is provided between the diverter groove 811 and the discharge nozzle 82 for transporting the molten plastic from the diverter groove 811 into the discharge nozzle 82. Each concave mold 3 is provided with a discharge nozzle 82, and an electric heating wire is provided in the discharge nozzle 82 to keep the plastic in a molten state in the discharge nozzle 82. The material transport channel 812 transports the molten plastic into each discharge nozzle 82.

[0048] The fixed mold 1 is provided with a guide hole 12, and the movable mold 2 is provided with a guide column 22 that can guide the movement of the movable mold 2, and the guide column 22 slides along the guide hole 12. This improves the processing accuracy and stability of the injection mold. In one embodiment, the two sides of the fixed mold 1 are provided with guide holes 12 at the front, middle and rear parts, and the movable mold 2 is provided with the same number of guide columns 22 accordingly.

[0049] The movable mold 2 and the ejector plate 62 are both driven to rise and fall by a lifting mechanism. The lifting mechanism can be a linear module, a linear motor drive assembly, a hydraulic cylinder drive assembly, etc., or other forms of lifting mechanisms.

Claims

1. An injection mold, characterized in that: The invention comprises a fixed mold (1) and a movable mold (2), wherein a concave mold (3) is provided at the bottom of the fixed mold (1), and a convex mold (4) is provided at the top of the movable mold (2) and can be moved toward the concave mold (3). The concave mold (3) and the convex mold (4) can cooperate to form an injection molding cavity (5). A hot runner system for conveying molten plastic to each injection molding cavity (5) is provided in the fixed mold (1), and a feed port (11) for an injection molding machine to inject molten plastic into the hot runner system is also provided on the fixed mold (1). (2) is internally slidably connected with a push rod (61) that can extend from the punch (4) to demould the product, and the movable mold (2) is also provided with a push pin plate (62) that can slide relative to the movable mold (2) to drive the push rod (61), the concave mold (3) is provided with a guide cone (31), and the punch (4) is provided with a guide groove (41) whose shape matches that of the guide cone (31), and a wear-resistant block (311) is provided on the outer side wall of the guide cone (31) or the inner side wall of the guide groove (41).

2. An injection mold according to claim 1, characterized in that: The upper end of the ejector rod (61) is provided with a cone-shaped ejector head (611) with a large top and a small base, the punch (4) is provided with a sliding hole (42) for the ejector rod (61) to slide, and the punch (4) is provided with an embedding groove (43) matching the shape of the ejector head (611) at the opening of the sliding hole (42).

3. An injection mold according to claim 2, characterized in that: The outer side wall of the push rod (61) is provided with a spiral groove (612) for adding lubricating oil.

4. An injection mold according to claim 3, characterized in that: A water transport channel (613) is provided inside the push rod (61) for transporting cooling liquid to the upper end of the push rod (61).

5. An injection mold according to claim 1 or 4, characterized in that: The fixed mold (1) is provided with a first cooling water channel (71) capable of cooling the concave mold (3), and the movable mold (2) is provided with a second cooling water channel (72) capable of cooling the convex mold (4).

6. The injection mold according to claim 1, characterized in that: The hot runner system comprises a hot runner plate (81) arranged on a fixed mold (1) and a discharge nozzle (82) for injecting molten plastic into an injection molding cavity (5); a diverter groove (811) is arranged on the hot runner plate (81); and a material transport channel (812) is arranged between the diverter groove (811) and the discharge nozzle (82) for transporting the molten plastic in the diverter groove (811) into the discharge nozzle (82).

7. The injection mold according to claim 1, characterized in that: The ejector plate (62) is provided with a third cooling water channel (614) for inputting cooling water into the water transport channel (613).

8. The injection mold according to claim 1, characterized in that: The fixed mold (1) is provided with a guide hole (12), and the movable mold (2) is provided with a guide column (22) capable of guiding the movement of the movable mold (2).

9. The injection mold according to claim 1, characterized in that: A plurality of concave dies (3) are distributed in an array at the bottom of the fixed die (1), and a plurality of convex dies (4) are distributed in an array at the top of the movable die (2).

10. The injection mold according to claim 1, characterized in that: The movable mold (2) and the ejector plate (62) are both driven to rise and fall by the jacking mechanism.

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