Injection mold

Abstract

An injection mold comprises a first mold plate, a first mold core and a cover plate. The first template is provided with a first containing groove. The first mold core is installed in the first containing groove. The first mold core comprises an upper surface, a lower surface, an injection molding groove formed in the lower surface, a central runner formed in the upper surface, and a plurality of cooling runners formed in the upper surface. The central runner and the first ends of the cooling runners are located above the injection molding groove. The cover plate covers the upper surface, the central flow channel and the plurality of cooling flow channels. The injection molding groove, the central flow channel and the cooling flow channels are separated from one another, and the cooling flow channels are arranged on the upper surface in a radial mode and surround the central flow channel. The first mold core comprises at least four cooling runners.

Description

Technical Field

[0001] The invention relates to an injection mold, in particular to an injection mold with a cooling channel. Background Art

[0002] Injection molds are widely used in the manufacturing industry to form plastic into plastic products. The injection mold can inject plastic into the product cavity between the male mold plate and the female mold plate. When the plastic cools, the plastic product is formed in the product cavity. At this time, the injection mold can drive an ejector mechanism to separate the plastic product from the male mold plate, and then the plastic product can be removed from the injection mold.

[0003] However, in the prior art, in order to speed up the cooling speed of the plastic in the product cavity, a cooling channel is set on the mother mold plate. However, the cooling channel is generally only extended linearly and has long strip grooves of the same depth, resulting in uneven cooling of the plastic. The outer surface of the plastic product may have problems such as joint lines, stress marks, or air marks, which is difficult to meet the cooling requirements of plastic products with large and complex outer surfaces, thereby affecting the quality of the plastic products. Summary of the invention

[0004] In view of this, the present invention provides an injection mold, in which a cooling channel is designed to match the surface of a plastic product, thereby reducing the probability of a weld line, stress mark, or air mark on the plastic product, thereby improving the quality of the plastic product.

[0005] The present invention discloses an injection mold, including a first template, a first mold core, and a cover plate. The first template has a first accommodating groove. The first mold core is installed in the above-mentioned first accommodating groove. The above-mentioned first mold core includes an upper surface, a lower surface, an injection molding groove formed on the above-mentioned lower surface, a central flow channel formed on the above-mentioned upper surface, and a plurality of cooling flow channels formed on the above-mentioned upper surface. The multiple first ends of the above-mentioned central flow channel and the above-mentioned multiple cooling flow channels are located above the above-mentioned injection molding groove. The cover plate covers the above-mentioned upper surface, the above-mentioned central flow channel, and the above-mentioned multiple cooling flow channels. The above-mentioned injection molding groove, the above-mentioned central flow channel, and the above-mentioned multiple cooling flow channels are separated from each other, and the above-mentioned multiple cooling flow channels are radially arranged on the above-mentioned upper surface and surround the above-mentioned central flow channel. The above-mentioned first mold core includes at least three or at least four of the above-mentioned multiple cooling flow channels.

[0006] According to an embodiment of the present invention, the first mold core includes a plurality of connecting channels, and each of the plurality of connecting channels is connected to two adjacent plurality of cooling channels.

[0007] According to an embodiment of the present invention, the plurality of connecting flow channels are arc-shaped, the plurality of connecting flow channels are arranged along an annular path, and the central flow channel is located in the annular path.

[0008] According to one embodiment of the present invention, the first mold core further includes a plurality of auxiliary grooves connected to the central flow channel, the auxiliary grooves are located between the central flow channel and the injection groove, and the volume of the central flow channel is greater than three times that of the auxiliary grooves.

[0009] According to one embodiment of the present invention, the cover plate further includes a plurality of first cooling holes, a plurality of second cooling holes, a central water injection hole, and a central drainage hole, each of the plurality of first cooling holes and each of the plurality of second cooling holes is connected to one of the plurality of cooling channels, and the central water injection hole and the central drainage hole are connected to the central channel.

[0010] According to one embodiment of the present invention, each of the plurality of first cooling holes is connected to one side of one of the plurality of first ends of the plurality of cooling channels, and each of the plurality of second cooling holes is connected to the other side of one of the plurality of first ends of the plurality of cooling channels.

[0011] According to an embodiment of the present invention, each of the plurality of first cooling holes is connected to one of the plurality of first ends of the plurality of cooling channels, and each of the plurality of second cooling holes is connected to one of the plurality of second ends of the plurality of cooling channels.

[0012] According to one embodiment of the present invention, the first mold core further includes a plurality of auxiliary channels formed on the upper surface, the plurality of auxiliary channels are respectively connected to the bottoms of the plurality of second ends of the plurality of cooling channels, each of the plurality of first cooling holes is connected to one of the plurality of first ends of the plurality of cooling channels, and each of the plurality of second cooling holes is connected to one of the plurality of auxiliary channels.

[0013] According to one embodiment of the present invention, the injection mold further comprises: a second template and a second mold core. The second template is located below the first template and has a second receiving groove. The second mold core is installed in the second receiving groove and corresponds to the first mold core. When the first mold core contacts the second mold core, a product cavity is formed between the injection groove and the second mold core.

[0014] According to one embodiment of the present invention, the injection mold further includes a central waterproof ring and a main waterproof ring. The first mold core includes a central sealing groove formed on the upper surface. The central sealing groove surrounds the central flow channel. The central waterproof ring is arranged in the central sealing groove and abuts against the cover plate. The first mold core includes a main sealing groove formed on the upper surface. The main sealing groove surrounds the plurality of cooling flow channels. The main waterproof ring is arranged in the main sealing groove and abuts against the cover plate.

[0015] In summary, the injection mold of the present invention can reduce the probability of weld lines, stress marks, or air marks on the outer surface of the plastic product through the design of the flow channel, thereby improving the quality of the plastic product. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 FIG. 4 is a schematic diagram of an injection mold according to an embodiment of the present invention.

[0017] Figure 2 and Figure 3 FIG. 4 is a schematic diagram of the operation of an injection mold according to an embodiment of the present invention.

[0018] Figure 4 FIG. 4 is an exploded view of a first mold core and a cover plate according to a first embodiment of the present invention.

[0019] Figure 5 Schematic diagram of a first mold plate, a first mold core, a second mold core, and a cover plate according to a first embodiment of the present invention.

[0020] Figure 6 FIG. 4 is a top view of a first mold core according to a first embodiment of the present invention.

[0021] Figure 7 FIG. 1 is a top view of a cover plate according to a first embodiment of the present invention.

[0022] Figure 8 FIG. 4 is an exploded view of a first mold core and a cover plate according to a second embodiment of the present invention.

[0023] Fig. 9 Schematic diagram of a first mold plate, a first mold core, a second mold core, and a cover plate according to a second embodiment of the present invention.

[0024] Fig.10 Schematic diagram of a first mold plate, a first mold core, a second mold core, and a cover plate according to a third embodiment of the present invention.

[0025] Main component symbols

[0026] Injection mold 1

[0027] Upper mold frame 10

[0028] First template 20

[0029] The first receiving groove 21

[0030] Water injection channel 22

[0031] Drainage channel 23

[0032] First mold 30

[0033] Upper surface 31

[0034] Lower surface 32

[0035] Limit block 33

[0036] Top 331

[0037] Cover slot 332

[0038] Injection groove 34

[0039] Top 341

[0040] Side wall 342

[0041] Central channel 35

[0042] Cooling channel 36

[0043] First cooling channel 36a

[0044] Second cooling channel 36b

[0045] The third cooling channel 36c

[0046] Fourth cooling channel 36d

[0047] First End 361

[0048] Second end 362

[0049] Protrusion 363

[0050] Connecting channel 37

[0051] First connecting flow channel 37a

[0052] Second connecting flow channel 37b

[0053] Auxiliary slot 38

[0054] Auxiliary channel 39

[0055] Cover 40

[0056] The first cooling hole 41

[0057] Second cooling hole 42

[0058] Central water injection hole 43

[0059] Central drain hole 44

[0060] Second template 50

[0061] The second receiving groove 51

[0062] Second mold 60

[0063] Base 70

[0064] Injection mechanism 80

[0065] Injection joint 81

[0066] Heat manifold 82

[0067] Hot Mouth 83

[0068] Ejector mechanism 90

[0069] Fixed plate 91

[0070] Guide column 92

[0071] Ejector plate 93

[0072] Ejector 94

[0073] Driving mechanism 95

[0074] Drive rod 951

[0075] Elastic element 952

[0076] First section C1

[0077] Curved section C2

[0078] Inclined section C3

[0079] Second section C4

[0080] Vertical direction D1

[0081] Injection device E1

[0082] Central waterproof ring G1

[0083] Main waterproof ring G2

[0084] Inner waterproof ring G3

[0085] Central sealing groove I1

[0086] Main seal groove I2

[0087] Inner seal groove I3

[0088] Screw hole I4

[0089] Plastic products P1

[0090] Product cavity S1

[0091] Injection cavity S2

[0092] The following specific implementation manner will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0093] In order to facilitate those skilled in the art to understand and implement the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the present invention provides many applicable creative concepts, which can be implemented in a variety of specific forms. The specific embodiments discussed in the text as examples are only specific ways to make and use the present invention, and are not intended to limit the scope of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present invention.

[0094] In addition, repeated numbers or labels may be used in different embodiments. These repetitions are only for the purpose of simply and clearly describing the present invention and do not represent any correlation between the different embodiments and / or structures discussed. It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be a centrally arranged element at the same time. When an element is considered to be "set on" another element, it can be directly set on the other element or there may be a centrally arranged element at the same time.

[0095] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0096] Figure 1 FIG. 1 is a schematic diagram of an injection mold 1 according to an embodiment of the present invention. The injection mold 1 is used to shape plastic into a plastic product P1 (such as Figure 2 The injection mold 1 may include an upper mold frame 10, a first mold plate 20, a first mold core 30, a cover plate 40, a second mold plate 50, a second mold core 60, and a base 70. The upper mold frame 10, the first mold plate 20, the first mold core 30, the cover plate 40, the second mold plate 50, the second mold core 60, and the base 70 may be arranged in sequence along a vertical direction D1, and may extend perpendicularly to the vertical direction D1.

[0097] In the present embodiment, the first template 20, the first mold core 30, the cover plate 40, the second template 50, and the second mold core 60 may be plate-like structures. The widths of the upper mold frame 10, the first template 20, the second template 50, and / or the base 70 may be the same or substantially the same. The widths of the first mold core 30 and the second mold core 60 may be the same or substantially the same. The aforementioned widths may be measured in a direction perpendicular to the vertical direction D1 (horizontal direction). In the present invention, "substantially the same" is defined as within an error range of positive 10% to negative 10% of "the same", and includes the "same" state. The upper mold frame 10, the first template 20, the first mold core 30, the cover plate 40, the second template 50, the second mold core 60, and / or the base 70 may be made of metal material, such as steel.

[0098] The first mold 20 is connected to the bottom side of the upper mold frame 10. In this embodiment, the first mold 20 is detachably fixed to the upper mold frame 10. The first mold 20 is located between the upper mold frame 10 and the second mold 50. The first mold 20 may have a first receiving groove 21. The first mold core 30 may be detachably installed in the first receiving groove 21. The first mold core 30 may be replaced with another first mold core according to the shape of different plastic products P1. The cover plate 40 is detachably installed on the first mold core 30 and may contact the bottom surface of the first receiving groove 21.

[0099] The second template 50 is located at the bottom side of the first template 20. In this embodiment, the first template 20 can selectively contact the second template 50 or be separated from the second template 50. The second template 50 is located between the first template 20 and the base 70. The second template 50 may have a second accommodating groove 51. The second mold core 60 is detachably installed in the second accommodating groove 51 and corresponds to the first mold core 30. The second mold core 60 can be replaced with another second mold core according to the shape of different plastic products P1. The first mold core 30 can selectively contact the second mold core 60 or be separated from the second mold core 60. When the first mold core 30 contacts the second mold core 60, a product cavity S1 and an injection cavity S2 are formed between the first mold core 30 and the second mold core 60, and the injection cavity S2 is connected to the product cavity S1.

[0100] In this embodiment, the first template 20 may be a female template, and the first mold core 30 may be a female mold core. The second template 50 may be a male template, and the second mold core 60 may be a male mold core. In another embodiment, the first template 20 may be a male template, and the first mold core 30 may be a male mold core. The second template 50 may be a female template, and the second mold core 60 may be a female mold core.

[0101] The base 70 is connected to the bottom side of the second template 50. The base 70 can be placed on a platform or a ground. In this embodiment, the second template 50 is detachably fixed to the base 70.

[0102] The injection mold 1 further includes an injection mechanism 80 and an ejection mechanism 90. The injection mechanism 80 is used to inject plastic into the product cavity S1. The ejection mechanism 90 is used to eject the plastic product P1 formed after the plastic in the product cavity S1 is cooled out of the second mold core 60.

[0103] The injection mechanism 80 is disposed in the upper mold frame 10 and the first mold plate 20. In this embodiment, the injection mechanism 80 includes an injection joint 81, a hot manifold 82, and a plurality of hot sprues 83. The injection joint 81 is disposed on the upper mold frame 10. The hot manifold 82 is disposed in the upper mold frame 10 and connected to the hot sprues 83.

[0104] The hot nozzle 83 is disposed in the upper mold frame 10 and the first mold plate 20. One end of the hot nozzle 83 is connected to the hot manifold 82, and the other end of the hot nozzle 83 is connected to the injection cavity S2. In this embodiment, the injection mechanism 80 has two hot nozzles 83, but is not limited thereto. In another embodiment, the injection mechanism 80 may have at least one or more than three hot nozzles 83. The hot nozzle 83 may extend along the vertical direction D1, or the multiple hot nozzles 83 may be parallel to each other.

[0105] In the present invention, the injection connector 81 is used to connect an injection device E1. The injection device E1 provides plastic to the injection connector 81. The plastic enters the injection cavity S2 through the injection connector 81, the hot manifold 82, and the hot nozzle 83. The plastic enters the product cavity S1 through the injection cavity S2. After the plastic is cooled and hardened, the plastic in the product cavity S1 forms a plastic product P1.

[0106] The ejection mechanism 90 is disposed in the base 70 and the second template 50. The ejection mechanism 90 includes a fixed plate 91, a guide post 92, an ejector plate 93, a plurality of ejectors 94, and a driving mechanism 95. The fixed plate 91 is located at the bottom of the base 70. The guide post 92 is disposed on the fixed plate 91. The guide post 92 may extend perpendicularly to the fixed plate 91, or extend along the vertical direction D1. In this embodiment, one end of the guide post 92 is fixed to the fixed plate 91, and the other end of the guide post 92 extends into the second template 50. In addition, the guide post 92 may pass through the ejector plate 93.

[0107] The ejector plate 93 is movably disposed in the base 70 and is located between the fixed plate 91 and the second template 50. The ejector plate 93 can extend perpendicular to the vertical direction D1, and the ejector plate 93 can move along the guide column 92. In other words, the guide column 92 can limit the ejector plate 93 from extending along the vertical direction D1.

[0108] The ejector pin 94 is connected to the ejector plate 93 and can move in the vertical direction D1. In the present embodiment, the ejector pin 94 can be an oblique pin. One end of the ejector pin 94 is connected to the ejector plate 93, and the other end of the ejector pin 94 can contact the product cavity S1. The driving mechanism 95 is disposed in the base 70 and the second template 50 to move the ejector plate 93. In the present embodiment, the driving mechanism 95 includes a driving rod 951 and an elastic element 952. One end of the driving rod 951 is fixed to the ejector plate 93. The driving rod 951 can movably pass through the second template 50 and can pass through the elastic element 952. The driving rod 951 can be used to limit the movement of the ejector plate 93 in the vertical direction D1. One end of the elastic element 952 is fixed to the ejector plate 93, and the other end is fixed in the second template 50. The elastic element 952 is used to provide a pulling force to the ejector plate 93.

[0109] Figure 2 and Figure 3 FIG. 1 is a schematic diagram of the operation of an injection mold 1 according to an embodiment of the present invention. Figure 1 As shown, when the injection mold 1 is used to make a plastic product P1, the first mold plate 20 is first connected to the second mold plate 50. Then, the injection device E1 is driven to inject plastic into the injection cavity S2 and the product cavity S1 through the injection joint 81, the hot manifold 82, and the hot nozzle 83. After the plastic in the product cavity S1 is cooled, the plastic forms the plastic product P1 (as shown in FIG. Figure 2 shown).

[0110] like Figure 2 As shown, the first mold plate 20 is separated from the second mold plate 50 to expose the plastic product P1 outside the second mold core 60. Since the first mold plate 20 is separated from the second mold plate 50, the elastic element 952 can pull the ejector plate 93 to move along the vertical direction D1. Figure 3 As shown, when the driving rod 951 and the ejector pin 94 move along the vertical direction D1, the driving rod 951 and the ejector pin 94 protrude from the second mold plate 50 and the second mold core 60. Then, the ejector pin 94 separates the plastic product P1 from the second mold core 60, thereby taking the plastic product P1 out of the injection mold 1.

[0111] Figure 4 FIG. 4 is an exploded view of the first mold core 30 and the cover plate 40 according to the first embodiment of the present invention. Figure 5 Schematic diagram of a first mold plate 20 , a first mold core 30 , a cover plate 40 , and a second mold core 60 according to a first embodiment of the present invention. Figure 6 FIG. 4 is a top view of the first mold core 30 according to the first embodiment of the present invention. Figure 7 FIG. 4 is a top view of the cover plate 40 according to the first embodiment of the present invention.

[0112] The first mold core 30 includes an upper surface 31, a lower surface 32, and a stopper 33. The upper surface 31 may be parallel to the lower surface 32, and the upper surface 31 and the lower surface 32 may extend perpendicularly to the vertical direction D1. The upper surface 31 may face the bottom surface (eg, Figure 1 31 ). The lower surface 32 faces the second mold core 60. In this embodiment, the stop block 33 is disposed on the upper surface 31. The top surface 331 of the stop block 33 can contact the upper mold frame 10. The stop block 33 forms a cover plate groove 332 for placing the cover plate 40. The bottom surface of the cover plate groove 332 is the upper surface 31 of the first mold core 30. In another embodiment, the first mold core 30 may not include the stop block 33, the top surface 331 and the cover plate groove 332. The cover plate 40 is directly placed on the upper surface 31.

[0113] The first mold core 30 further includes an injection groove 34, a central flow channel 35, a plurality of cooling flow channels 36, and a plurality of connecting flow channels 37. The injection groove 34, the central flow channel 35, and the cooling flow channels 36 are separated from each other. The connecting flow channels 37 are separated from each other. Each connecting flow channel 37 is connected to two adjacent cooling flow channels 36.

[0114] The injection groove 34 is formed on the lower surface 32. When the first mold core 30 contacts the second mold core 60, a product cavity S1 is formed between the injection groove 34 and the second mold core 60. In this embodiment, the injection groove 34 has a top surface 341 and a side wall 342. In this embodiment, the top surface 341 can be circular. The side wall 342 can be an annular structure connected to the top surface 341 and the lower surface 32, and can be inclined relative to the vertical direction D1.

[0115] The central flow channel 35, the cooling flow channel 36, and the connecting flow channel 37 can be filled with a coolant to cool the plastic in the injection tank 34. In this embodiment, the coolant can be water, but is not limited thereto. The central flow channel 35 is formed on the upper surface 31 and is located in the central area of ​​the upper surface 31. In this embodiment, the center of the upper surface 31 is located in the central flow channel 35. The central flow channel 35 is located above the center of the top surface 341 of the injection tank 34.

[0116] In this embodiment, the width of the top surface 341 of the injection groove 34 may be greater than twice the width of the central flow channel 35. The width of the top surface 341 of the injection groove 34 may be less than five times the width of the central flow channel 35. The above width is measured in the same direction perpendicular to the vertical direction D1. The depth of the central flow channel 35 may be greater than 0.3 times the minimum distance between the central flow channel 35 and the injection groove 34. The depth of the central flow channel 35 may be less than twice the minimum distance between the central flow channel 35 and the injection groove 34. The above depth and distance are measured in the vertical direction D1.

[0117] A plurality of cooling channels 36 are formed on the upper surface 31 and are located at the edge region of the upper surface 31. The edge region surrounds the central region. A plurality of cooling channels 36 are radially arranged on the upper surface 31 and surround the central channel 35. In the present embodiment, the first end 361 of the cooling channel 36 is adjacent to the central channel 35, and the second end 362 of the cooling channel 36 is adjacent to the edge of the first mold core 30 or the upper surface 31. In other words, the first end 361 of the cooling channel 36 is closer to the central channel 35 than the second end 362 of the cooling channel 36. The distance between the first ends 361 of two adjacent cooling channels 36 is smaller than the distance between the second ends 362 of two adjacent cooling channels 36.

[0118] In this embodiment, the opening of the cooling channel 36 on the upper surface 31 is in the shape of a long strip, and each opening of the cooling channel 36 on the upper surface 31 extends through the central channel 35. In other words, the longitudinal axis of the opening of the cooling channel 36 on the upper surface 31 passes through the first end 361 and the second end 362, and the longitudinal axis extends through the central channel 35 or the center of the upper surface 31 of the first mold core 30. The length of each opening of the cooling channel 36 on the upper surface 31 is greater than twice or three times the width of the central channel 35, but is not limited thereto.

[0119] The contour of the bottom surface of the cooling channel 36 matches the contour of the top surface 341 and the side wall 342 of the injection groove 34. The depth of the second end 362 of the cooling channel 36 is greater than the depth of the second end 362. In this embodiment, the depth of the second end 362 of the cooling channel 36 is more than twice the depth of the second end 362. The above depth is measured along the vertical direction D1.

[0120] In this embodiment, the bottom surface of the cooling channel 36 has a first section C1, a curved section C2, an inclined section C3, and a second section C4. The first section C1 is located above the top surface 341 of the injection groove 34, and the length of the first section C1 is between 0.3 times and 2 times the width of the central channel 35, and the length and width are measured in the same direction perpendicular to the vertical direction D1. The curved section C2 corresponds to the turning point of the top surface 341 and the side wall 342 of the injection groove 34, the inclined section C3 corresponds to the side wall 342 of the injection groove 34, and the second section C4 is located on the lower surface 32. On a cross section perpendicular to the longitudinal direction of the cooling channel 36, the first section C1 and the inclined section C3 are straight lines, the curved section C2 is a curve, and the second section C4 can be a curve or include straight lines.

[0121] In this embodiment, the distance between the first section C1 and the top surface 341 of the injection groove 34 is in the range of 0.8 to 1.2 times, or 0.9 to 1.1 times, of the distance between the inclined section C3 and the side wall 342 of the injection groove 34. The distance between the first section C1 and the top surface 341 of the injection groove 34 is in the range of 0.8 to 1.2 times, or 0.9 to 1.1 times, of the distance between the curved section C2 and the junction of the top surface 341 and the side wall 342 of the injection groove 34. The distance between the first section C1 and the top surface 341 of the injection groove 34 is in the range of 0.8 to 1.2 times, or 0.9 to 1.1 times, of the distance between the second section C4 and the lower surface 32 of the first mold core 30.

[0122] In this embodiment, the first mold core 30 includes eight cooling channels 36. In some embodiments, the first mold core 30 includes at least four, five, six, seven, or more than eight cooling channels 36. In some embodiments, the first mold core 30 includes four to twenty cooling channels 36.

[0123] The connecting channel 37 is connected between the first end 361 and the second end 362 of the cooling channel 36. In other words, the connecting channel 37 connects the central area of ​​the cooling channel 36 and can be close to the first end 361. The distance between the connecting channel 37 and the first end 361 of the cooling channel 36 is smaller than the distance between the connecting channel 37 and the second end 362 of the cooling channel 36. In this embodiment, the connecting channel 37 is arc-shaped, and the connecting channel 37 extends and is arranged along an annular path, and the central channel 35 is located in the annular path. In one embodiment, the annular path is a circular path, and the center of the circular path is the center of the upper surface 31 of the first mold core 30.

[0124] like Figure 6 As shown, two connecting channels 37 connect three adjacent cooling channels 36. In other words, two adjacent connecting channels 37 (the first connecting channel 37a and the second connecting channel 37b) are connected to the same cooling channel 36 (the first cooling channel 36a). The two ends of the first connecting channel 37a are connected to the first cooling channel 36a and the second cooling channel 36b. The two ends of the second connecting channel 37b are connected to two adjacent connecting channels 37 (the first cooling channel 36a and the third cooling channel 36c). The first cooling channel 36a is located between the second cooling channel 36b and the third cooling channel 36c, and is adjacent to the second cooling channel 36b and the third cooling channel 36c. In addition, the fourth cooling channel 36d is not connected to the connecting channel 37.

[0125] The cover plate 40 covers the upper surface 31, the central flow channel 35, and the plurality of cooling flow channels 36. In this embodiment, the cover plate 40 is located in the cover plate groove 332. The cover plate 40 further includes a plurality of first cooling holes 41, a plurality of second cooling holes 42, a central water injection hole 43, and a central drainage hole 44. Each first cooling hole 41 and each second cooling hole 42 are connected to one of the plurality of cooling flow channels 36. In other words, the same cooling flow channel 36 is connected to a first cooling hole 41 and a second cooling hole 42. The central water injection hole 43 and the central drainage hole 44 are connected to the central flow channel 35.

[0126] In this embodiment, each first cooling hole 41 is connected to one side of one of the first ends 361 of the plurality of cooling channels 36, and each second cooling hole 42 is connected to the other side of one of the first ends 361 of the plurality of cooling channels 36. Figure 6 As shown, one of the first cooling holes 41 is connected to one side of the second cooling channel 36b, and one of the second cooling holes 42 is connected to the other side of the third cooling channel 36c. Two adjacent first cooling holes 41 and second cooling holes 42 are connected to both sides of the fourth cooling channel 36d. One or both sides of some cooling channels 36 have protrusions 363 for connecting the first cooling holes 41 or the second cooling holes 42.

[0127] In this embodiment, the first template 20 further includes a plurality of water injection channels 22 and a plurality of drainage channels 23. Each water injection channel 22 is respectively connected to a first cooling hole 41 or a central water injection hole 43. Each drainage channel 23 is respectively connected to a second cooling hole 42 or a central drainage hole 44. The water injection channel 22 is used to provide coolant to be injected into the cooling channel 36, the connecting channel 37 and the central channel 35 through the first cooling hole 41 and the central water injection hole 43 of the cover plate 40. The coolant in the cooling channel 36, the connecting channel 37 and the central channel 35 is discharged to the drainage channel 23 through the second cooling hole 42 and the central drainage hole 44 of the cover plate 40.

[0128] In another embodiment, each water injection channel 22 is respectively connected to a second cooling hole 42 or a central water injection hole 43. Each drainage channel 23 is respectively connected to a first cooling hole 41 or a central drainage hole 44. The water injection channel 22 is used to provide coolant to be injected into the cooling channel 36, the connecting channel 37 and the central channel 35 through the second cooling hole 42 and the central water injection hole 43 of the cover plate 40. The coolant in the cooling channel 36, the connecting channel 37 and the central channel 35 is discharged to the drainage channel 23 through the first cooling hole 41 and the central drainage hole 44 of the cover plate 40.

[0129] In this embodiment, the first mold core 30 further includes a central sealing groove I1, a main sealing groove I2, a plurality of inner sealing grooves I3, and a plurality of screw holes I4. The central sealing groove I1, the main sealing groove I2, and the plurality of inner sealing grooves I3 are formed on the upper surface 31 of the first mold core 30. The central sealing groove I1 surrounds the central flow channel 35. A central waterproof ring G1 is disposed in the central sealing groove I1 and abuts against the cover plate 40. The main sealing groove I2 surrounds the plurality of cooling flow channels 36 and the central sealing groove I1. A main waterproof ring G2 is disposed in the main sealing groove I2 and abuts against the cover plate 40. The plurality of inner sealing grooves I3 and the plurality of screw holes I4 are located between the central sealing groove I1 and the main sealing groove I2, and each inner sealing groove I3 surrounds a screw hole I4. The cover plate 40 is fixed to the first mold core 30 via the screw hole I4. As shown Figure 6 As shown, a plurality of inner waterproof rings G3 are respectively disposed in a plurality of inner sealing grooves I3 and abut against the cover plate 40 .

[0130] Figure 8 FIG. 4 is an exploded view of the first mold core 30 and the cover plate 40 according to the second embodiment of the present invention. Fig. 9 Schematic diagram of the first mold plate 20, the first mold core 30, the cover plate 40, and the second mold core 60 according to the second embodiment of the present invention. In the second embodiment, each connecting channel 37 connects two adjacent cooling channels 36, and each cooling channel 36 connects one connecting channel 37. In the second embodiment, each first cooling hole 41 is connected to the second end 362 of one cooling channel 36, and each second cooling hole 42 is connected to the second end 362 of another adjacent cooling channel 36.

[0131] The first mold core 30 further includes a plurality of auxiliary grooves 38 connected to the bottom of the central flow channel 35. The auxiliary grooves 38 are located between the central flow channel 35 and the injection groove 34. The volume of the central flow channel 35 is three times greater than the auxiliary grooves 38. The depth of the central flow channel 35 is twice greater than the depth of the auxiliary grooves 38. The design of the auxiliary grooves 38 of this embodiment can achieve a better cooling effect on the plastic in the product cavity S1, and can achieve good structural strength of the first mold core 30 between the central flow channel 35 and the injection groove 34. In addition, the second embodiment may not include the auxiliary grooves 38. The auxiliary grooves 38 of the second embodiment can be applied to the first embodiment.

[0132] Fig.10Schematic diagram of the first mold plate 20, the first mold core 30, the cover plate 40, and the second mold core 60 according to the third embodiment of the present invention. In the third embodiment, the first mold core 30 further includes a plurality of auxiliary channels 39 formed on the upper surface 31 or the top surface 331. Each auxiliary channel 39 is respectively connected to the bottom of the second end 362 of a cooling channel 36. Each water injection channel 22 is respectively connected to an auxiliary channel 39 or the central water injection hole 43. Each drainage channel 23 is respectively connected to an auxiliary channel 39 or the central drainage hole 44. In this way, the coolant can flow in or out through the bottom of the second end 362 of the cooling channel 36, so as to achieve a good cooling effect.

[0133] In another embodiment, the auxiliary channel 39 is formed on the upper surface 31 and communicates with the Fig. 9 The first cooling hole 41 or the second cooling hole 42 is shown. The first cooling hole 41 or the second cooling hole 42 is connected to the water injection channel 22 or the drainage channel 23. In addition, the third embodiment may not include the auxiliary groove 38.

[0134] In summary, the injection mold of the present invention can reduce the probability of weld lines, stress marks, or air marks on the outer surface of the plastic product by designing the central flow channel, cooling flow channel, and connecting flow channel of the first mold core, thereby improving the appearance quality of the plastic product.

[0135] For ordinary technicians in this field, other corresponding changes or adjustments can be made based on the creative scheme and creative concept of the present invention in combination with the actual needs generated, and these changes and adjustments should fall within the scope of protection of the claims of the present invention.

Claims

1. An injection mold, characterized in that: include: A first template, comprising a first receiving groove; a first mold core installed in the first accommodating groove, wherein the first mold core comprises an upper surface, a lower surface, an injection groove formed on the lower surface, a central flow channel formed on the upper surface, and a plurality of cooling flow channels formed on the upper surface, wherein the first ends of the central flow channel and the plurality of cooling flow channels are located above the injection groove; and a cover plate, covering the upper surface, the central flow channel, and the plurality of cooling flow channels; The injection groove, the central flow channel, and the plurality of cooling flow channels are separated from each other, and the plurality of cooling flow channels are radially arranged on the upper surface and surround the central flow channel; The first mold core includes at least three of the plurality of cooling channels.

2. The injection mold according to claim 1, characterized in that: The first mold core includes a plurality of connecting flow channels, and each of the plurality of connecting flow channels is connected to two adjacent plurality of cooling flow channels.

3. The injection mold according to claim 2, characterized in that: The plurality of connecting flow channels are arc-shaped, the plurality of connecting flow channels are arranged along an annular path, and the central flow channel is located in the annular path.

4. The injection mold according to claim 1, characterized in that: The first mold core further includes a plurality of auxiliary grooves connected to the central flow channel. The auxiliary grooves are located between the central flow channel and the injection groove, and the volume of the central flow channel is greater than three times that of the auxiliary grooves.

5. The injection mold according to claim 1, characterized in that: The cover plate further includes a plurality of first cooling holes, a plurality of second cooling holes, a central water injection hole, and a central drainage hole. Each of the plurality of first cooling holes and each of the plurality of second cooling holes is connected to one of the plurality of cooling channels, and the central water injection hole and the central drainage hole are connected to the central channel.

6. The injection mold according to claim 5, characterized in that: Each of the plurality of first cooling holes is connected to one side of one of the plurality of first ends of the plurality of cooling channels, and each of the plurality of second cooling holes is connected to the other side of one of the plurality of first ends of the plurality of cooling channels.

7. The injection mold according to claim 5, characterized in that: Each of the plurality of first cooling holes is connected to one of the plurality of first ends of the plurality of cooling channels, and each of the plurality of second cooling holes is connected to one of the plurality of second ends of the plurality of cooling channels.

8. The injection mold according to claim 5, characterized in that: The first mold core further includes a plurality of auxiliary channels formed on the upper surface, the plurality of auxiliary channels are respectively connected to the bottoms of the plurality of second ends of the plurality of cooling channels, each of the plurality of first cooling holes is connected to one of the plurality of first ends of the plurality of cooling channels, and each of the plurality of second cooling holes is connected to one of the plurality of auxiliary channels.

9. The injection mold according to claim 1, characterized in that: Also includes: A second template, located below the first template and having a second receiving groove; A second mold core is installed in the second receiving groove and corresponds to the first mold core; When the first mold core contacts the second mold core, a product cavity is formed between the injection groove and the second mold core.

10. The injection mold according to claim 1, characterized in that: It also includes a central waterproof ring and a main waterproof ring. The first mold core includes a central sealing groove formed on the upper surface, the central sealing groove surrounds the central flow channel, the central waterproof ring is disposed in the central sealing groove and abuts against the cover plate, The first mold core includes a main sealing groove formed on the upper surface, the main sealing groove surrounds the plurality of cooling channels, and the main waterproof ring is disposed in the main sealing groove and abuts against the cover plate.

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