Injection mold with inclined hole core

Abstract

The utility model provides a kind of injection mold of inclined hole core-pulling, including oblique core-pulling mechanism, the oblique core-pulling mechanism includes driver, transmission part and forming insert, the oblique guide channel is set up in the front mould kernel, the forming insert is movably assembled in the oblique guide channel, the driver is connected the forming insert by the transmission part, to drive forming insert to and fro activity in oblique guide channel, and then extend or extract the injection cavity. Realized after clamping again insertion, and the action of extraction before opening, guarantee the injection qualified rate of product.

Description

Technical Field

[0001] This utility model relates to the field of injection molds, specifically to an injection mold for oblique hole core pulling. Background Technology

[0002] Injection molds are tools used to produce plastic products; they are also tools that give plastic products a complete structure and precise dimensions. Injection molding is a processing method used to mass-produce certain complex-shaped parts.

[0003] When injection-molded products require the molding of angled holes inclined towards the mold opening direction, improper operation during mold opening or closing can easily lead to interference with other components and breakage. Therefore, it is best to have the ability to control the insertion and withdrawal of inserts or insert blocks during operation; for example, inserting them after mold closing and withdrawing them before mold opening. Existing structures linked to the mold body cannot adequately meet these requirements. Therefore, the core-pulling mechanism of the injection mold needs to be redesigned. Utility Model Content

[0004] To address the aforementioned problems, this invention provides an injection mold for core pulling with oblique holes.

[0005] To achieve the above objectives, the technical solution provided by this utility model is as follows: An injection mold for oblique hole core pulling includes a front mold assembly, a front mold core disposed on the front mold assembly, a rear mold assembly, and a rear mold core disposed on the rear mold assembly. The front mold core and the rear mold core cooperate to form an injection cavity. The mold also includes an oblique core pulling mechanism, which includes a driver, a transmission component, and a molding insert. The front mold core has an oblique guide channel, and the molding insert is movably assembled within the oblique guide channel. The driver is connected to the molding insert via the transmission component to drive the molding insert to reciprocate within the oblique guide channel, thereby extending into or withdrawing from the injection cavity.

[0006] Optionally, the transmission component is a slanted pull rod, and the molding insert includes a slanted pull block and a first insert pin. The slanted pull block is movably assembled in the inclined guide channel. The slanted pull rod passes through the front mold assembly and the front mold core and forms a slanted guide engagement with the slanted pull block. The driver is fixed on the outside of the front mold assembly and drives the slanted pull rod. The slanted pull block is also provided with a sliding groove. The first insert pin is slidably assembled in the sliding groove and fixed to the slanted pull block by a pin. In the mold-closed state, the end of the first insert pin extends into the injection cavity and abuts against the rear mold core.

[0007] With this structure, the driver drives the inclined pull rod to move, and the movement of the inclined pull rod causes the inclined pull block to move in the inclined guide channel of the front mold core, thereby driving the first insert pin to insert or withdraw. The movement of the first insert pin can be controlled by itself to better prevent the first insert pin from interfering with other components and to better protect the first insert pin. In the mold-closed state, the end of the first insert extends into the injection cavity and abuts against the rear mold core, thereby providing good positioning and protection for the end of the first insert to prevent the end of the first insert from being bent by the huge pressure during injection molding. The first insert is slidably mounted in the groove and fixed to the inclined block by a pin. In this way, the number and position of the first inserts mounted in the groove of the inclined block can be adjusted, making it more flexible and applicable to a wider range of situations.

[0008] Furthermore, the groove of the inclined pull block is a dovetail groove or a "convex" groove; the first end of the first insert pin is provided with a limiting cap, which is stuck in the groove; the inclined pull block and the first insert pin are provided with corresponding pin holes; when the first insert pin slides to a preset position in the groove, the pin holes on the inclined pull block and the first insert pin correspond to each other and are connected by a pin.

[0009] Furthermore, a plurality of first insert pins are fixed in the groove of the inclined pull block.

[0010] Furthermore, the inclined core-pulling mechanism also includes a slider, the driving end of the driver is connected to the slider, and the slider is connected to the inclined core-pulling rod.

[0011] Furthermore, the number of sets of the inclined pull rod, the inclined pull block and the first insert pin is multiple, and multiple inclined pull rods are connected to the slider.

[0012] Furthermore, the inclined core-pulling mechanism also includes a side pull rod, a second insert pin, and an elastic element. The side pull rod is parallel to the inclined pull rod and passes through the front mold assembly and the front mold core, connecting to the driver. The side pull rod is provided with a first abutment surface and a second abutment surface adjacent to the first abutment surface and recessed inward. The second insert pin is movably inserted into the front mold core, with its head abutting against the first or second abutment surface of the side pull rod, and its tail corresponding to the injection cavity. The elastic element applies a spring force to the second insert pin in a direction away from the injection cavity.

[0013] Furthermore, the tip of the second insert has a spherical arc shape.

[0014] Furthermore, the elastic element is a spring, which is sleeved on the second insert pin, with its two ends abutting against the second insert pin and the front mold core, respectively.

[0015] Optionally, the transmission component includes a first slider and a first shovel base, the molding insert is a molding block, the inclined guide channel extends to the front mold assembly, the molding block is movably assembled in the inclined guide channel; the first slider is laterally slidably assembled on the front mold assembly, the first shovel base is fixed on the first slider and forms an inclined guide engagement with the molding block, and the driver is fixed on the outside of the front mold assembly and drives the first slider.

[0016] Furthermore, it also includes a lateral core-pulling mechanism, which includes a second shovel base, a second slider, and a molding insert. The front mold assembly includes at least a first front mold plate and a second front mold plate. The first front mold plate is disposed on the front side of the second front mold plate, and the front mold core is fixed on the rear side of the second front mold plate. The second slider is laterally slidably mounted on the second front mold plate, and the molding insert is fixed to the second slider and passes through the front mold core to insert into the injection cavity. The second shovel base forms an oblique guide fit with the second slider and is fixed on the first front mold plate.

[0017] The technical solution provided by this utility model has the following beneficial effects: A driver is used to move the molding insert back and forth in the inclined guide channel, thereby extending into or withdrawing from the injection cavity. The movement of the molding insert can be controlled to better prevent interference between the molding insert and other components. It also enables insertion after mold closing and withdrawal before mold opening, ensuring the safety of mold opening and the injection molding qualification rate of the product. Attached Figure Description

[0018] Figure 1 The image shown is a front view of the injection mold for the oblique hole core pulling method in Embodiment 1; Figure 2 As shown Figure 1 Sectional view of line AA in the middle; Figure 3 As shown Figure 2 Enlarged view of region B in the middle; Figure 4 The diagram shown is a schematic diagram of the internal structure of the injection mold for the oblique hole core pulling in Example 1. Figure 5 As shown Figure 4 Enlarged view of region C in the middle; Figure 6 The diagram shown is an exploded view of the assembly structure of the inclined pull rod, the inclined pull block, and the first insert pin in Embodiment 1. Figure 7 The diagram shown is an exploded view of the assembly structure of the side pull rod, the second insert, and the elastic element in Embodiment 1. Figure 8 The image shown is a cross-sectional view of the injection mold for the oblique hole core pulling method in Example 2. Figure 1 ; Figure 9 The image shown is a cross-sectional view of the injection mold for the oblique hole core pulling method in Example 2. Figure 2 ; Figure 10 The diagram shown is a partial structural schematic of the injection mold for the oblique hole core pulling method in Example 2. Detailed Implementation

[0019] To further illustrate the various embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention and are mainly used to illustrate the embodiments, and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these drawings, those skilled in the art should be able to understand other possible implementations and the advantages of the present invention. Components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0020] In the description of this utility model, terms such as "upper", "lower", "left", "right", "front", and "rear" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0021] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0022] Example 1 Reference Figures 1 to 7 As shown, this embodiment provides an injection mold for injection molding products with oblique holes (hole diameter between 0.7mm and 1.05mm). The injection mold includes a front mold assembly 11, a front mold core 13 disposed on the front mold assembly 11, a rear mold assembly 12, and a rear mold core 14 disposed on the rear mold assembly 12. When the mold is closed, the front mold core 13 and the rear mold core 14 cooperate to form an injection cavity 101.

[0023] The system also includes an inclined core-pulling mechanism, which comprises a driver 21, an inclined core-pulling rod 22, an inclined core-pulling block 23, and a first insert pin 24. The front mold core 13 has an inclined guide channel 131 aligned with the direction of a predetermined inclined hole. The inclined core-pulling block 23 is movably mounted within the inclined guide channel 131, meaning it can reciprocate along the extension direction of the inclined guide channel 131. The inclined core-pulling rod 22 passes through the front mold assembly 11 and the front mold core 13, forming an inclined guide engagement with the inclined core-pulling block 23. In this embodiment, the extension direction of the inclined core-pulling rod 22 is perpendicular to the mold opening direction, and the extension direction of the inclined core-pulling rod 22 is perpendicular to the extension direction of the inclined guide channel 131. The lateral movement of the inclined core-pulling rod 22 drives the inclined core-pulling block 23 to move within the inclined guide channel 131 via the inclined guide structure. The driver 21 is fixed to the outside of the front mold assembly 11 and drives the inclined core-pulling rod 22; the driver 21 drives the inclined core-pulling rod 22 to move.

[0024] The inclined pull block 23 is also provided with a sliding groove 231. The first insert pin 24 is slidably assembled in the sliding groove 231 and fixed to the inclined pull block 23 by a pin 25. In the mold closing state, the end of the first insert pin 24 extends into the injection cavity 101 and abuts against the rear mold core 14.

[0025] With the above solution provided in this embodiment, the driver 21 drives the inclined pull rod 22 to move. The movement of the inclined pull rod 22 causes the inclined pull block 23 to move in the inclined guide channel 131 of the front mold core 13, thereby driving the first insert pin 24 to insert or withdraw. The movement of the first insert pin 24 can be controlled by itself. For example, it can be set to drive the first insert pin 24 to insert after the mold is closed, and to drive the first insert pin 24 to withdraw before the mold is opened, so as to better prevent the first insert pin 24 from interfering with other components and better protect the first insert pin 24.

[0026] Specifically, in the mold-closed state, the end of the first insert pin 24 extends into the injection cavity 101 and abuts against the rear mold core 14. If a positioning hole is opened on the rear mold core 14, the end of the first insert pin 24 is inserted into the positioning hole. This arrangement can provide good positioning protection for the end of the first insert pin 24 and prevent the end of the first insert pin 24 from being bent by the huge pressure during injection molding.

[0027] Meanwhile, the first insert pin 24 is slidably mounted in the groove 231 and fixed to the inclined pull block 23 by a pin 25. In this way, multiple first insert pins 24 can be mounted in the groove 231 of the inclined pull block 23, and the position of the first insert pins 24 can be adjusted. For example, in this embodiment, one injection cavity 101 is matched with one first insert pin 24, but the same inclined pull block 23 is equipped with two first insert pins 24 to match two injection cavities 101 respectively. Of course, the number of first insert pins 24 can also be increased or decreased, and the position of the first insert pins 24 can be adjusted according to the actual situation; it is more flexible and has a wider range of applications.

[0028] Furthermore, the groove 231 of the inclined pull block 23 is a dovetail groove or a "convex" groove; such as Figure 6 As shown, in this embodiment, the groove is a "convex" shape, with the inner groove width being greater than the outer groove width. The first insert pin 24 has a limiting cap 241 at its tip, similar to a nut in a screw structure. The limiting cap 241 is engaged on the inner groove of the slide groove 231 and extends outward through the outer groove. The inclined pull block 23 and the first insert pin 24 are provided with corresponding pin holes; that is, the pin hole 232 of the inclined pull block 23 and the pin hole 242 of the first insert pin 24. When the first insert pin 24 slides to a preset position in the slide groove 231, the pin hole 232 of the inclined pull block 23 and the pin hole 242 of the first insert pin 24 correspond to each other and are connected by a pin 25. In this way, a reliable connection is achieved.

[0029] In this embodiment, the front mold core 13 and the rear mold core 14 together form four injection cavities 101, which can mold four products at once. Each injection cavity 101 is equipped with a first insert pin 24. The inclined pull rod 22, inclined pull block 23, and first insert pin 24 are arranged in two groups. The inclined pull rod 22 in both groups is connected to a slider 29. The driving end of the driver 21 is connected to the slider 29, which synchronously drives the inclined pull rod 22 in both groups. Each inclined pull rod 22 is connected to an inclined pull block 23, and each inclined pull block 23 is equipped with two first insert pins 24, corresponding to two injection cavities 101 respectively, thus achieving synchronous insertion and core pulling. Of course, in other embodiments, the number of injection cavities 101 and the number of first insert pins 24 equipped in each injection cavity 101 can be adjusted according to actual conditions.

[0030] Furthermore, the product also has a vertical hole parallel to the mold opening and closing direction. Therefore, in this embodiment, the oblique core-pulling mechanism further includes a side pull rod 26, a second insert pin 27, and an elastic element 28. The side pull rod 26 is parallel to the oblique pull rod 22. The side pull rod 26 passes through the front mold assembly 11 and the front mold core 13 and is connected to the driver 21. Specifically, the side pull rod 26 is also fixed on the slider 29. The side pull rod 26 is provided with a first abutting surface 261 and an adjacent surface to the first abutting surface 261. The second abutment surface 262 is recessed inward, and the second insert 27 is movably inserted into the front mold core 13. The head end 271 of the second insert 27 abuts against the first abutment surface 261 or the second abutment surface 262 of the side pull rod 26, and the end of the second insert 27 corresponds to the injection cavity 101. The elastic member 28 applies an elastic force to the second insert 27 in a direction away from the injection cavity 101, that is, the head end of the second insert 27 can always abut against the side pull rod 26 under the action of the elastic member 28. When the mold is closed, the side pull rod 26 is driven by the driver 21, so that the first abutment surface 261 contacts the head end of the second insert pin 27, thereby driving the second insert pin 27 to insert into the injection cavity 101; similarly, the end of the second insert pin 27 also abuts against the rear mold core 14 for protection; when the core is pulled out, the driver 21 drives the side pull rod 26 to move, so that the second abutment surface 262 corresponds to the second insert pin 27, and the second insert pin 27 is pulled out of the injection cavity 101 under the action of the elastic member 28, which also realizes the core pulling action; that is, the first insert pin 24 and the second insert pin 27 realize synchronous insertion and core pulling actions.

[0031] Furthermore, the first end 271 of the second insert 27 is a spherical arc structure to reduce the sliding friction with the side pull rod 26.

[0032] Furthermore, the elastic element 28 is a spring, which is sleeved on the second insert 27, with its two ends abutting against the second insert 27 and the front mold core 13 respectively; to achieve stable assembly.

[0033] Of course, in other embodiments, if the product does not have a vertical hole structure, the structure of the side pull rod 26, the second insert pin 27 and the elastic member 28 described above may not be used.

[0034] Specifically, the driver 21 is a hydraulic cylinder and is fixed to the outside of the front mold assembly 11. Using a hydraulic cylinder for driving is a relatively mature technology in the field. Of course, in other embodiments, driving devices such as electric push rods can also be used.

[0035] Example 2 Reference Figures 8 to 10As shown, this embodiment provides an injection mold for injection molding products with oblique holes. Specifically, the injection mold includes a front mold assembly 11, a front mold core 13 disposed on the front mold assembly 11, a rear mold assembly 12, and a rear mold core 14 disposed on the rear mold assembly 12. When the mold is closed, the front mold core 13 and the rear mold core 14 cooperate to form an injection cavity 101.

[0036] The system also includes an inclined core-pulling mechanism, which comprises a driver 31, a first slider 32, a first spade base 33, and a molding insert 34. The front mold assembly 11 and the front mold core 13 are provided with inclined guide channels that extend to the injection cavity 101. The inclined guide channels have the same slope as the inclined holes of the product. The molding insert 34 is movably assembled in the inclined guide channels. The first slider 32 is slidably mounted on the front mold assembly 11 in a lateral (perpendicular to the mold opening and closing direction). The first spade base 33 is fixed on the first slider 32 and forms an inclined guide engagement with the molding insert 34. The driver 31 is fixed on the outside of the front mold assembly 11 and drives the first slider 32.

[0037] Through the above-described solution provided in this embodiment, the driver 31 drives the first slider 32 to move laterally, thereby driving the molding insert 34 to move back and forth in the inclined guide channel through the first shovel base 33; thus driving the molding insert 34 to insert or withdraw from the injection cavity 101 at an inclined angle; specifically, during mold closing, the front mold assembly 11 and the rear mold assembly 12 close first, and the front mold core 13 and the rear mold core 14 cooperate to form the injection cavity 101; then, the driver 31 drives the first slider 32 to move, and the movement of the first slider 32 drives the molding insert 34 to move in the inclined guide channel through the first shovel base 33, thereby causing the molding insert 34 to insert into the injection cavity 101; the molding insert 34 inserted into the injection cavity 101 abuts against the rear mold core 14 to form the inclined hole of the product. After injection molding is completed, the driver 31 drives the first slider 32 to move outward, thereby pulling the molding insert 34 out of the injection cavity 101 through the first spade base 33, allowing the molding insert 34 to be pulled out first. After the core is pulled out, the front mold assembly 11 and the rear mold assembly 12 begin to open the mold, realizing the demolding of the product. Through the inclined core pulling mechanism of this application, the actions of inserting after mold closing and pulling out before mold opening are realized, ensuring the injection molding qualification rate of the product.

[0038] Specifically, the driver 31 is a hydraulic cylinder and is fixed to the outside of the front mold assembly 11. Using a hydraulic cylinder for driving is a relatively mature technology in this field. Of course, in other embodiments, driving devices such as electric push rods can also be used.

[0039] Furthermore, the product also has lateral through holes. Therefore, in this embodiment, the injection mold also includes a lateral core-pulling mechanism 40. Specifically, the lateral core-pulling mechanism 40 includes a second shovel base 41, a second slider 42, and a molding insert 43. The front mold assembly 11 includes at least a first front template 111 and a second front template 112. The first front template 111 is disposed on the front side of the second front template 112, and the front mold core 13 is fixed on the rear side of the second front template 112. The aforementioned driver 31 and the first slider 32 are both connected to the second front template 112. The second slider 42 is laterally slidably mounted on the second front template 112. The molding insert 43 is fixed to the second slider 42 and passes through the front mold core 13 to insert into the injection cavity 101. The second shovel base 41 and the second slider 42 form an oblique guide fit and are fixed on the first front template 111.

[0040] When the front mold assembly 11 and the rear mold assembly 12 are closed, the second shovel base 41 drives the second slider 42 to slide inward, thereby pushing the molding insert 43 into the injection cavity 101. After injection is completed, the aforementioned inclined core-pulling mechanism pulls the core first (i.e., the molding insert 34 pulls the core first). Then, the first front mold plate 111 and the second front mold plate 112 begin to separate. The separation of the first front mold plate 111 and the second front mold plate 112 is achieved by the second shovel base 41 driving the second slider 42 to move outward, thereby driving the molding insert 43 to pull the core outward. After the molding insert 43 completes the core pulling, the front mold core 13 and the rear mold core 14 continue to separate, completing the subsequent demolding action.

[0041] Although the present invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the present invention without departing from the spirit and scope of the present invention as defined in the appended claims, and all such changes shall be within the scope of protection of the present invention.

Claims

1. A type of injection mold for oblique hole core pulling, comprising a front mold assembly, a front mold core disposed on the front mold assembly, a rear mold assembly, and a rear mold core disposed on the rear mold assembly, wherein the front mold core and the rear mold core cooperate to form an injection cavity; characterized in that: The device includes an inclined core-pulling mechanism, which comprises a driver, a transmission component, and a molding insert. An inclined guide channel is provided on the front mold core. The molding insert is movably assembled in the inclined guide channel. The driver is connected to the molding insert through the transmission component to drive the molding insert to move back and forth in the inclined guide channel, thereby extending into or withdrawing from the injection cavity.

2. The injection mold for oblique hole core pulling according to claim 1, characterized in that: The transmission component is a slanted pull rod, and the molding insert includes a slanted pull block and a first insert pin. The slanted pull block is movably assembled in the inclined guide channel. The slanted pull rod passes through the front mold assembly and the front mold core and forms a slanted guide engagement with the slanted pull block. The driver is fixed on the outside of the front mold assembly and drives the slanted pull rod. The slanted pull block is also provided with a sliding groove. The first insert pin is slidably assembled in the sliding groove and fixed to the slanted pull block by a pin. In the mold-closed state, the end of the first insert pin extends into the injection cavity and abuts against the rear mold core.

3. The injection mold for core pulling with oblique holes according to claim 2, characterized in that: The groove of the inclined pull block is a dovetail groove or a "convex" groove; the first end of the first insert is provided with a limit cap, which is stuck in the groove. The inclined pull block and the first insert are provided with corresponding pin holes. When the first insert slides to a preset position in the groove, the pin holes on the inclined pull block and the first insert correspond to each other and are connected by a pin.

4. The injection mold for core pulling with oblique holes according to claim 2, characterized in that: Multiple first inserts are fixed in the groove of the inclined pull block.

5. The injection mold for oblique hole core pulling according to claim 2, characterized in that: The oblique core-pulling mechanism also includes a slider, the driving end of the driver is connected to the slider, and the slider is connected to the oblique core-pulling rod.

6. The injection mold for oblique hole core pulling according to claim 5, characterized in that: The number of sets of the inclined pull rod, the inclined pull block and the first insert pin is multiple, and multiple inclined pull rods are connected to the slider.

7. The injection mold for oblique hole core pulling according to claim 1 or 5, characterized in that: The inclined core-pulling mechanism further includes a side pull rod, a second insert pin, and an elastic element. The side pull rod is parallel to the inclined pull rod and passes through the front mold assembly and the front mold core, connecting to the driver. The side pull rod has a first abutment surface and a second abutment surface adjacent to the first abutment surface and recessed inward. The second insert pin is movably inserted into the front mold core, with its head abutting against the first or second abutment surface of the side pull rod, and its tail corresponding to the injection cavity. The elastic element applies a spring force to the second insert pin in a direction away from the injection cavity.

8. The injection mold for core pulling with oblique holes according to claim 7, characterized in that: The first end of the second insert is a spherical arc structure.

9. The injection mold for core pulling with oblique holes according to claim 1, characterized in that: The transmission component includes a first slider and a first shovel base. The molding insert is a molding block. The inclined guide channel extends to the front mold assembly. The molding block is movably assembled in the inclined guide channel. The first slider is laterally slidably assembled on the front mold assembly. The first shovel base is fixed on the first slider and forms an inclined guide engagement with the molding block. The driver is fixed on the outside of the front mold assembly and drives the first slider.

10. The injection mold for core pulling with oblique holes according to claim 9, characterized in that: It also includes a lateral core-pulling mechanism, which includes a second shovel base, a second slider, and a molding insert. The front mold assembly includes at least a first front mold plate and a second front mold plate. The first front mold plate is disposed on the front side of the second front mold plate, and the front mold core is fixed on the rear side of the second front mold plate. The second slider is laterally slidably mounted on the second front mold plate, and the molding insert is fixed to the second slider and passes through the front mold core to be inserted into the injection cavity. The second shovel base forms an oblique guide fit with the second slider and is fixed on the first front mold plate.

Images