High-precision zero-degree demolding injection mold and shell forming device

Abstract

A high-precision zero-degree demolding injection mold and shell forming device comprises an injection mold and a punching mold, and the injection mold comprises a front mold, a rear mold opposite to the front mold, a front mold core arranged on the inner side of the front mold and a rear mold core arranged on the inner side of the rear mold; the rear mold core comprises a middle mold core and a four-slide part, and a lower forming cavity is defined by the middle mold core and the four-slide part; a center forming part is arranged on the middle mold core, a hole forming cavity is formed in the outer side end face of the center forming part, a rear water gap groove is formed in the center of the bottom of the hole forming cavity, a hole forming protrusion corresponding to the hole forming cavity is arranged on the front mold core, a front water gap groove corresponding to the rear water gap groove is formed in the hole forming protrusion, and a glue inlet is formed in the front water gap groove. According to the utility model, the zero-degree mold stripping can be realized, the product precision and the working efficiency are higher, in addition, the glue inlet position is arranged in the through hole, and the water gap is punched by the mold, so that no glue inlet position exists on the surface of the product, and the product precision is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of plastic parts molding equipment, in particular to a high-precision zero-degree ejection injection mold and a shell molding device with the injection mold. Background Art

[0002] Injection molding is widely used to produce low-cost and relatively complex parts. One benefit of injection molding is its ability to produce a large number of identical parts. However, the injection molding process imposes certain constraints on the manufacturing process, such as uniform wall thickness, rounded corners, draft angles, etc. Normal products have a certain draft angle on their surfaces. The draft angle is also the draft angle, which is the slope designed in the mold cavity to facilitate demolding. In processing such as Figure 1 When the outer surface shown is a vertical shell, the shell is directly ejected using an ejector pin because there is no draft angle during demoulding. However, the hard top shell may cause scratches on the outer shell surface or a rough product surface. In addition, during traditional mold molding, the sprue inlet position is usually set on the outer surface of the product. After the sprue is removed, there will be a mark of the inlet position on the surface of the product, which will affect the appearance of the product and make the product precision poor. Utility Model Content

[0003] Based on this, it is necessary to provide a high-precision zero-degree ejection injection mold and a shell molding device having the mold to address the deficiencies in the prior art.

[0004] A high-precision zero-degree ejection injection mold, comprising a front mold, a rear mold arranged opposite to the front mold, a front mold core arranged on the inner side of the front mold, and a rear mold core arranged on the inner side of the rear mold; the rear mold core comprises a middle mold core and four positioning pieces, the inner surface of the rear mold is provided with a center groove and four slide grooves arranged on the outer peripheral edge of the center groove, the middle mold core is installed in the center groove, the positioning piece is installed in the slide groove and moves forward and backward along the slide groove, the middle mold core and the four positioning pieces enclose a lower molding cavity; the positioning piece is provided with a guide hole extending outwardly from the outside to the inside and inclined outward, and the corresponding position of the front mold core A guide column extending outward is arranged on the upper part, and the guide column is installed in the guide hole; a central molding part is arranged on the middle mold core, a hole molding cavity is arranged on the outer end surface of the central molding part, a rear water inlet groove is arranged at the bottom center position of the hole molding cavity, a hole molding protrusion corresponding to the hole molding cavity is arranged on the front mold core, a front water inlet groove corresponding to the rear water inlet groove is arranged on the hole molding protrusion, and a glue inlet is arranged in the front water inlet groove; after the mold is closed, a hollow cavity is formed between the hole molding protrusion and the side surface of the hole molding cavity, the front water inlet groove and the rear water inlet groove, and is communicated with the lower molding cavity.

[0005] Furthermore, a notch is provided on the side of the hole forming cavity, a splicing insert is embedded in the notch, and the top end of the splicing insert is spliced ​​with other hole forming cavity areas outside the notch to form a complete hole forming cavity.

[0006] Furthermore, the sliding member includes a moving part and an outer forming part arranged on the inner side of the moving part, the bottom of the two opposite sides of the moving part are provided with convex edges, the slide groove has guide grooves extending from the bottom of both sides, the convex edges are inserted from the outer end of the guide groove and move forward and backward along the guide groove.

[0007] Furthermore, a rear positioning block is provided on the rear mold core, a positioning groove is provided on the top surface of the rear positioning block, the positioning groove is provided in a long strip shape, and the orientations of the positioning grooves on adjacent rear positioning blocks are different; a front positioning block is provided on the inner surface of the front mold, a long strip convex strip is convexly provided on the front positioning block, and the front positioning block and the rear positioning block are installed in a one-to-one corresponding manner.

[0008] Furthermore, the guide hole is arranged at the top of the movable part, a fourth limiting groove is arranged on the top surface of the outer molding part, a limiting protrusion is arranged at the corresponding position of the front mold core, and the limiting protrusion is embedded in the fourth limiting groove.

[0009] Furthermore, the rear mold core is provided with two groups, and the four sliding parts are respectively side sliding parts, an inner sliding part and an outer sliding part. The two groups of inner sliding parts are installed in the same slide groove between the two rear mold cores, the outer sliding part and the inner sliding part are arranged opposite to each other, and the side sliding parts are respectively arranged on the other two opposite sides.

[0010] Furthermore, the bottom surface of the outer forming part is higher than the bottom surface of the moving part, and a telescopic spring is arranged between the inner positioning part and the middle mold core. Assembly holes are arranged on the front end surface of the bottom of the moving part and the bottom of the upper side surface of the center base, and the telescopic spring is installed in two corresponding assembly holes.

[0011] Furthermore, two front mold mounting grooves are provided on the inner surface of the front mold, the front mold core is installed in the front mold mounting grooves, a connecting groove is provided between the two front mold mounting grooves, a wedge block is provided in the middle of the connecting groove, and the wedge block is embedded between the two inner position members.

[0012] Furthermore, a first limit block is provided at each of the four corner positions on the top surface of the middle mold core, a first limit groove is provided between adjacent first limit blocks, the four first limit grooves are distributed in a cross shape, and a second limit groove is provided at the outermost corner position of the first limit block; a third limit block is provided at the corresponding position of the front mold core, and the third limit block is embedded in the second limit groove.

[0013] A shell molding device, which includes an injection mold and a punching mold, a high-precision zero-degree ejection injection mold, which includes a front mold, a rear mold arranged opposite to the front mold, a front mold core arranged on the inner side of the front mold, and a rear mold core arranged on the inner side of the rear mold; the rear mold core includes a middle mold core and four positioning pieces, the inner surface of the rear mold is provided with a center groove and four slide grooves arranged on the outer peripheral edge of the center groove, the middle mold core is installed in the center groove, the positioning piece is installed in the slide groove, and the middle mold core and the four positioning pieces are enclosed to form a lower molding cavity; the positioning piece is provided with a guide hole extending outwardly from the outside to the inside and tilted outward, and the corresponding position of the front mold core A guide column extending outward is arranged on the device, and the guide column is installed or disengaged from the guide hole to push the sliding part away from or close to the middle mold core; a central molding part is arranged on the middle mold core, a hole molding cavity is arranged on the outer end face of the central molding part, a rear water inlet groove is arranged at the bottom center position of the hole molding cavity, a hole molding protrusion corresponding to the hole molding cavity is arranged on the front mold core, a front water inlet groove corresponding to the rear water inlet groove is arranged on the hole molding protrusion, and a glue inlet is arranged in the front water inlet groove; after the mold is closed, the hole molding protrusion and the hole molding cavity, the front water inlet groove and the rear water inlet groove are all arranged at intervals, and are connected with the lower molding cavity.

[0014] Furthermore, a notch is provided on the side of the hole forming cavity, a splicing insert is inlaid in the notch, and the splicing insert and the hole forming cavity are spliced ​​to form a complete hole forming cavity.

[0015] Furthermore, the sliding member includes a moving part and an outer forming part arranged on the inner side of the moving part, the bottom of the two opposite sides of the moving part are provided with convex edges, the slide groove has guide grooves extending from the bottom of both sides, the convex edges are inserted from the outer end of the guide groove and move forward and backward along the guide groove.

[0016] Furthermore, a guide hole and a rear positioning block are provided on the outside of the rear mold core, a positioning groove is provided on the top surface of the rear positioning block, the positioning groove is provided in a long strip shape, and the orientations of the positioning grooves on adjacent rear positioning blocks are different; a positioning column and a front positioning block are also provided on the inner surface of the front mold, a long strip convex strip is convexly provided on the front positioning block, and the positioning column and the front positioning block are fitted and installed one by one with the guide hole and the rear positioning block on the rear mold.

[0017] Furthermore, the guide hole is arranged at the top of the movable part, a fourth limiting groove is arranged on the top surface of the outer molding part, a limiting protrusion is arranged at the corresponding position of the front mold core, and the limiting protrusion is embedded in the fourth limiting groove.

[0018] Furthermore, the rear mold core is provided with two groups, and the four sliding parts are respectively side sliding parts, an inner sliding part and an outer sliding part. The two groups of inner sliding parts are installed in the same slide groove between the two rear mold cores, the outer sliding part and the inner sliding part are arranged opposite to each other, and the side sliding parts are respectively arranged on the other two opposite sides.

[0019] Furthermore, the bottom surface of the outer forming part is higher than the bottom surface of the moving part, and a telescopic spring is arranged between the inner positioning part and the middle mold core. Assembly holes are arranged on the front end surface of the bottom of the moving part and the bottom of the upper side surface of the center base, and the telescopic spring is installed in two corresponding assembly holes.

[0020] Furthermore, two front mold mounting grooves are provided on the inner surface of the front mold, the front mold core is installed in the front mold mounting grooves, a connecting groove is provided between the two front mold mounting grooves, a wedge block is provided in the middle of the connecting groove, and the wedge block is embedded between the two inner position members.

[0021] Furthermore, a first limit block is provided at the top corner position on the middle mold core, first limit grooves are provided between the first limit blocks, the four first limit grooves are distributed in a cross shape, and a second limit groove is provided at the outermost corner position of the first limit block; a third limit block is provided at the corresponding position of the front mold core, and the third limit block is embedded in the second limit groove.

[0022] The high-precision zero-degree ejection injection mold forms a shell product, which is provided with a through hole, and a sprue plate is formed in the through hole; the punching mold includes a frame, a driving device and a punch mounted on the frame; the driving device drives the punch to move downward to punch the sprue plate in the through hole of the product.

[0023] In summary, the shell forming device of the utility model is provided with four positioning parts, so that the product does not need to set the draft angle, and can achieve zero-degree demolding, and the product has high precision, and there will be no problems of surface roughness and damage. The rear mold core is made of beryllium copper, which has the advantages of fast thermal conductivity and stable temperature, so that the flow rate of the rubber material entering the mold cavity is accelerated, thereby shortening the molding cycle to a certain extent and improving work efficiency. The positioning accuracy can be further improved by setting the front positioning block and the rear positioning block in different directions for coordinated installation and positioning. In addition, the setting of the splicing insert can play a role in exhaust, thereby improving the processing quality of the product, and the water outlet is set on the inner side of the product outlet through hole, so that there is no glue inlet on the outer surface of the product, thereby improving the precision and aesthetics of the product. In the subsequent processing, the punching die is used for water outlet punching, which is not only convenient for processing and high in work efficiency, but also has a smooth inner wall of the through hole after punching. The utility model has strong practicality and strong promotion significance. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is an exploded schematic diagram of a high-precision zero-degree ejection injection mold of the utility model;

[0025] Figure 2 for Figure 1 Schematic diagram of the structure of the middle rear mold and the rear mold core;

[0026] Figure 3 for Figure 2 A partially enlarged structural schematic diagram;

[0027] Figure 4 for Figure 3 A partial enlarged schematic diagram of the structure;

[0028] Figure 5 for Figure 4 The structural diagram of the center forming part;

[0029] Figure 6 It is a structural schematic diagram of the front mold and the front mold core;

[0030] Figure 7 for Figure 6 Schematic diagram of the structure of the middle front mold core;

[0031] Figure 8 It is a schematic diagram of the structure of the shell. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0033] like Figures 1 to 7 As shown, it is a shell forming device provided by the utility model. In this embodiment, it is used to form Figure 8 The housing 100 shown in the figure has a bottom end surface of a cavity structure, and a through hole 101 extending downward and penetrating the housing 100 is arranged on the top surface.

[0034] The shell molding device includes a high-precision zero-degree ejection injection mold and a sprue punching device, wherein the sprue punching device is used to punch the sprue position on the molded product. The high-precision zero-degree ejection injection mold includes a front mold 10, a rear mold 20, a front mold core 30 and a rear mold core 40, wherein the front mold 10 and the rear mold 20 are arranged opposite to each other, and the front mold core 30 and the rear mold core are arranged on the inner surfaces of the front mold 10 and the rear mold 20 respectively.

[0035] In this embodiment, the rear mold core 40 is arranged in two groups side by side, and two groups of rear mold core installation grooves are arranged on the inner side surface of the rear mold 20, and the rear mold core 40 is installed in the corresponding installation grooves. Specifically, the rear mold core installation groove includes a central groove 21 and slide grooves 22 arranged around the outer side of the central groove 21, and the two groups of rear mold core installation grooves share the same slide groove 22. The rear mold core 40 includes a middle mold core 43 and four row positioning members 44, the middle mold core 43 is installed in the central groove 21, and the four row positioning members 44 are respectively installed in the four slide grooves 2241. It can be understood that in other embodiments, the rear mold core 40 and the rear mold core installation groove 41 can also be arranged in more than two groups, which is not limited here. In addition, the bottom of the groove of the rear mold core installation groove 41 is also provided with a plurality of ejector pins 50 that can be movably moved up and down to facilitate the ejection of the product. In this embodiment, the other structures of the rear mold 20 are all conventional mold structures, and also have an ejector plate, a push plate, etc. Therefore, other plate structures of the rear mold 20 are not described in detail here.

[0036] The middle mold core 43 includes a center base 431 and a center forming part 432 arranged in the middle of the inner side of the center base 431. A fixing hole is arranged in the middle of the center base 431, and a bottom plate is arranged at the bottom of the center forming part 432. The bottom plate is limited on the bottom surface of the center base 431, and the center forming part 432 extends above the center base 431. The center base 431 is provided with a first limit block 434 at a corner position of the top surface of one side of the center forming part, and a first limit groove 433 is arranged between the limit blocks. The four limit grooves 433 are distributed in a cross shape, and a second limit groove 435 is arranged at the outermost corner position of the first limit block 434. A hole forming cavity 436 extending downward is arranged at the top of the center forming part 432, and a rear water inlet groove 437 is arranged at the bottom center position of the hole forming cavity 436. The rear water inlet groove 437 is arranged in a structure with a narrow inside and a wide outside.

[0037] A notch 438 is provided on the side of the hole forming cavity 436, and a splicing insert 439 is embedded in the notch 438. The bottom end of the splicing insert 439 is mounted on the central base 431, and the top inner side surface and bottom surface of the splicing insert 439 are spliced ​​with the hole forming cavity 436 to form a complete hole forming cavity 436 structure. The splicing insert is provided so that there will be a gap between the parts after it is spliced ​​with the central forming portion 432, and the gas generated by the forming can be discharged from the gap for easy exhaust.

[0038] The positioning member 44 includes a moving portion 441 and an outer molding portion 442 disposed on the inner side of the moving portion 441. The bottoms of the two opposite sides of the moving portion 441 are provided with convex edges 443. The slide groove 22 has guide grooves 421 extending from the bottoms of both sides. The convex edges 443 are inserted into the guide groove 421 from the outer end of the guide groove 421 and can move forward and backward along the guide groove 421. A cutout portion is provided at the bottom of the outer molding portion 442, and the bottom surface of the outer molding portion 442 is higher than the bottom surface of the moving portion 441. When the positioning member 44 moves toward the middle mold core 43, the outer molding portion 442 is embedded in the corresponding first limiting groove 433, and the central molding portion 432 and the outer molding portions 442 on the four positioning members 44 around it enclose to form a lower molding cavity. In addition, a guide hole 443 is provided on the top of the movable portion 441. The guide hole 443 is inclined and extends from top to bottom in a direction toward the other rear mold core 40 or away from the central molding portion 432. A fourth limiting groove 444 is provided on the top surface of the outer molding portion 442. The second limiting groove 444 is larger outside and smaller inside from outside to inside, so as to facilitate buckle guidance.

[0039] In this embodiment, the four positioning members 44 are respectively two side positioning members 445, an inner positioning member 446 and an outer positioning member 447, and the two side positioning members 445, an inner positioning member 446 and an outer positioning member 447 are respectively installed in the corresponding four slide grooves 22; wherein, the inner positioning member 446 is installed in the slide groove 22 between the two rear mold core mounting grooves 41, and the outer positioning member 447 is arranged opposite to the inner positioning member 446; and the two side positioning members 445 are respectively arranged on the other two opposite sides. In this embodiment, a telescopic spring 60 is also arranged between the inner positioning member 446 and the middle mold core 43. Specifically, the front end of the bottom of the moving part 441 is provided with assembly holes 448 on the corresponding side surfaces below the outer molding part 442 and on the central base 431, and the telescopic spring 60 is installed in the two corresponding assembly holes 448. In this embodiment, the two ends of the telescopic spring 60 are movably installed in the two assembly holes 448.

[0040] In addition, four guide holes 23 and four rear positioning blocks 24 are also provided on the surface of the rear mold 20 outside the rear mold core 40, and the four guide holes 23 are respectively provided at four corner positions. The four rear positioning blocks 24 are also distributed in four corners and are located inside the guide holes 23 of the lower positioning block. A positioning groove 25 is provided on the top surface of the rear positioning block 24. The positioning groove 25 is provided in a long strip shape, and the orientations of the positioning grooves 25 on adjacent rear positioning blocks 24 are different. In this embodiment, the positioning grooves 25 on adjacent rear positioning blocks are oriented vertically, and the orientations of the two diagonal positioning grooves 25 are consistent. If one positioning groove 25 extends horizontally, the positioning grooves 25 on the two adjacent positioning blocks extend longitudinally, and the positioning grooves 25 on the diagonal positioning blocks also extend horizontally.

[0041] Two front mold installation grooves 11 are arranged on the inner surface of the front mold 10, and the front mold core 30 is installed in the front mold installation grooves 11. A connecting groove 12 is arranged between the two front mold installation grooves 11, and a wedge block 13 is arranged in the middle of the connecting groove 12. The cross section of the wedge block 13 is arranged in a structure with a small outer end and a large inner side. The three sides of the front mold installation groove 11 except the connecting groove 12 are all arranged with guide grooves 14. The shape of the guide groove 14 matches the shape of the free end of the outer molding part 442. The outer side of the free end of the outer molding part 442 can be embedded in the guide groove 14. The outer side wall of the guide groove 14 extends outwardly from bottom to top and is inclined, and a wear-resistant block is arranged on the wall to improve the service life. The inner side of the guide groove 14 is connected with the front mold installation groove 11, and a guide column 15 is arranged on the outer side of the guide groove 14. It is arranged to extend obliquely from the fixed end to the free end, and its extension direction is the direction of the front mold installation groove 11 away from the center.

[0042] The front mold core 30 includes a front bottom plate 31 and an inner molding part 32, four second limiting blocks 33, and four third limiting blocks 34 arranged on the inner surface thereof. The inner molding part 32 is arranged in the middle of the inner surface of the front bottom plate 31. The end surface of the inner molding part 32 is provided with a front water inlet groove 35. The front water inlet groove 35 is arranged in a structure that is wide outside and narrow inside. A glue inlet hole 36 is arranged on the bottom surface of the front water inlet groove 35. The second limiting blocks 33 are arranged at the four corner positions of the inner surface of the front bottom plate 31. The third limiting grooves 37 are formed between adjacent second limiting blocks 33. The four third limiting grooves 37 are distributed in a cross shape. The third limiting block 34 is arranged at the end face corner position of the second limiting block 33. The third limiting block 34 is smaller than the second limiting block 33. The third limiting groove 37 is provided with a guide column 38 corresponding to the position of the inner positioning member 446. The guide column 38 extends obliquely toward the wedge block 13. In addition, a limiting protrusion 39 is further provided in the third limiting groove 37, and the limiting protrusion 39 corresponds to the fourth limiting groove 444 on the positioning member 44. A positioning column 301 and a front positioning block 302 are further provided on the inner surface of the front mold 30, and the positioning column 301 and the front positioning block 302 are provided one-to-one with the guide hole 23 and the rear positioning block 24 on the rear mold 20. A long strip convex strip 303 is convexly provided on the front positioning block 302.

[0043] During operation, the front mold 10 and the rear mold 20 are molded together, the positioning column 301 is inserted into the guide hole 23 of the rear mold 20, and the convex strip 303 of the front positioning block 302 is engaged in the positioning groove 25 on the rear positioning block 24. The setting of the front positioning block 301 and the rear positioning block 24 can further improve the positioning accuracy. The guide column 15 on the front mold 10 is embedded in the guide hole 443 on the corresponding slider 44. Because the guide column 15 is inclined, during the mold closing process, the guide column 15 will push the slider 44 to move toward the middle direction, and the wedge block 13 pushes down to squeeze the two inner sliders 446, the telescopic spring 60 is compressed, and the two inner sliders 446 move inwards close to the middle mold core 43. When the mold is completely closed, the front mold core 30, the rear mold core 40 and the four sliders 44 enclose to form a molding cavity for the molded product. The rubber enters the molding cavity from the rubber inlet 36 on the outside of the front mold 10 through the front sprue groove 35 on the inner molding part 32 for molding. When the mold is opened, the front mold 10 moves, the guide pillar 15 pushes the slider to move outward, and the inner slider 446 moves out due to the wedge block 13. The inner slider 446 is pushed away when the telescopic spring 60 rebounds; then the ejector pin ejects the product from the inside of the rear mold core 40.

[0044] After the front sprue groove of the inner molding part 32 on the front mold core 30 and the center molding part 432 on the rear mold core 40 are molded together, the corresponding position is the through hole 101 of the product, and the sprue groove formed by the two is thick inside and narrow outside, so that after molding, a sprue plate that is thick in the middle and thin on the outside and blocks the inner side of the through hole 101 will be formed at the through hole 101. During subsequent processing, the product is taken out of the mold, the sprue material is peeled off, and then the product is positioned and placed on the punching mold. The punching mold is a conventional mold structure, so its specific structure will not be described here. A punch is provided on the punching mold, the product is placed under the punch, and the through hole 101 is arranged opposite the punch. The equipment is started, and the punch punches out the sprue plate from the bottom. In this embodiment, the cross-section of the punch is the same as the required size of the through hole.

[0045] In summary, the shell molding device of the utility model is provided with four row positioning parts 44, so that the product does not need to set the draft angle, can achieve zero-degree demolding, and the product has high precision, and there will be no problems of surface roughness and damage. The rear mold core 40 adopts beryllium copper, which has the advantages of fast thermal conductivity and stable temperature, so that the flow rate of the rubber material entering the mold cavity is accelerated, thereby shortening the molding cycle to a certain extent and improving work efficiency. By setting the front positioning block 301 in different directions and coordinating the installation and positioning with the rear positioning block 24, the positioning accuracy can be further improved. In addition, the setting of the splicing insert can play the role of exhaust, thereby improving the processing quality of the product, and the water outlet is set on the inner side of the production port through hole 101, so that there is no glue entry position on the outer surface of the product, and the precision and aesthetics of the product are improved. And in the subsequent processing, the punching die is used for water outlet punching, which is not only convenient for processing and high in work efficiency, but also the inner wall of the through hole after punching is smooth. The utility model has strong practicality and strong promotion significance.

[0046] The above-mentioned embodiment only expresses one implementation method of the utility model, and its description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A high-precision zero-degree ejection injection mold, characterized in that: It comprises a front mold, a rear mold arranged opposite to the front mold, a front mold core arranged on the inner side of the front mold, and a rear mold core arranged on the inner side of the rear mold; the rear mold core comprises a middle mold core and four positioning pieces, a center groove and four slide grooves arranged on the outer peripheral edge of the center groove are arranged on the inner surface of the rear mold, the middle mold core is installed in the center groove, the positioning piece is installed in the slide groove and moves forward and backward along the slide groove, and the middle mold core and the four positioning pieces enclose a lower molding cavity; the positioning piece is provided with a guide hole extending outwardly from the outside to the inside and inclined outwardly, and a corresponding position of the front mold core is provided with a guide hole extending outwardly. An extending guide column is installed in the guide hole; a central molding part is arranged on the middle mold core, a hole molding cavity is arranged on the outer end surface of the central molding part, a rear water inlet groove is arranged at the bottom center position of the hole molding cavity, a hole molding protrusion corresponding to the hole molding cavity is arranged on the front mold core, a front water inlet groove corresponding to the rear water inlet groove is arranged on the hole molding protrusion, and a glue inlet is arranged in the front water inlet groove; after the mold is closed, a hollow cavity is formed between the hole molding protrusion and the side surface of the hole molding cavity, the front water inlet groove and the rear water inlet groove, and is communicated with the lower molding cavity.

2. A high-precision zero-degree ejection injection mold according to claim 1, characterized in that: A notch is provided on the side of the hole forming cavity, a splicing insert is inlaid in the notch, and the top end of the splicing insert is spliced ​​with other hole forming cavity areas outside the notch to form a complete hole forming cavity.

3. A high-precision zero-degree ejection injection mold according to claim 1, characterized in that: The sliding member includes a moving part and an outer forming part arranged on the inner side of the moving part. The bottoms of the two opposite sides of the moving part are provided with convex edges. The slide groove has guide grooves extending from the bottoms on both sides. The convex edges are inserted into the outer ends of the guide grooves and move forward and backward along the guide grooves.

4. A high-precision zero-degree ejection injection mold as claimed in claim 3, characterized in that: The rear mold core is also provided with a rear positioning block, and a positioning groove is provided on the top surface of the rear positioning block. The positioning groove is arranged in a long strip shape, and the orientations of the positioning grooves on adjacent rear positioning blocks are different; the inner surface of the front mold is provided with a front positioning block, and a long strip convex strip is convexly provided on the front positioning block. The front positioning block and the rear positioning block are installed in a one-to-one corresponding manner.

5. A high-precision zero-degree ejection injection mold as claimed in claim 3, characterized in that: The guide hole is arranged at the top of the moving part, a fourth limiting groove is arranged on the top surface of the outer molding part, a limiting protrusion is arranged at the corresponding position of the front mold core, and the limiting protrusion is embedded in the fourth limiting groove.

6. A high-precision zero-degree ejection injection mold as claimed in claim 3, characterized in that: The rear mold core is provided with two groups, and the four sliding parts are respectively two side sliding parts, an inner sliding part and an outer sliding part. The two groups of inner sliding parts are installed in the same slide groove between the two rear mold cores, the outer sliding part and the inner sliding part are arranged opposite to each other, and the two side sliding parts are respectively arranged on the other two opposite sides.

7. A high-precision zero-degree ejection injection mold according to claim 6, characterized in that: The bottom surface of the outer forming part is higher than the bottom surface of the moving part. A telescopic spring is also arranged between the inner positioning part and the middle mold core. Assembly holes are arranged on the front end surface of the bottom of the moving part and the bottom of the upper side surface of the center base. The telescopic spring is installed in two corresponding assembly holes.

8. A high-precision zero-degree ejection injection mold according to claim 6, characterized in that: Two front mold installation grooves are arranged on the inner surface of the front mold, the front mold core is installed in the front mold installation grooves, a connecting groove is arranged between the two front mold installation grooves, a wedge block is arranged in the middle of the connecting groove, and the wedge block is embedded between the two inner position members.

9. A high-precision zero-degree ejection injection mold according to claim 6, characterized in that: A first limit block is provided at each of the four corner positions on the top surface of the middle mold core, and a first limit groove is provided between adjacent first limit blocks. The four first limit grooves are distributed in a cross shape, and a second limit groove is provided at the outermost corner position of the first limit block; a third limit block is provided at the corresponding position of the front mold core, and the third limit block is embedded in the second limit groove.

10. A shell forming device, characterized in that: It includes an injection mold and a punching mold, wherein the injection mold is a high-precision zero-degree ejection injection mold as described in any one of claims 1 to 9, and the high-precision zero-degree ejection injection mold is used to mold a shell product, wherein a through hole is provided on the shell product, and a sprue plate is formed in the through hole; the punching mold includes a frame, a driving device and a punch mounted on the frame; the driving device drives the punch to move downward to punch the sprue plate in the through hole of the product.

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