Secondary core-pulling injection mold

Abstract

A secondary core-pulling injection mold comprises an upper mold plate and a lower mold plate, an upper mold core is installed on the upper mold plate, a lower mold core is installed on the lower mold plate, a mold cavity used for forming a product is formed between the upper mold core and the lower mold core, a buckling hole is formed in the inner side wall of the product, and the secondary core-pulling injection mold further comprises a core-pulling mechanism. The core pulling mechanism comprises a core pulling assembly and a driving assembly, the core pulling assembly comprises a core pulling insert, an inclined sliding insert and a movable pin, and the driving assembly is used for driving the core pulling insert to ascend and descend; the core-pulling insert is provided with an inclined sliding hole, the inclined sliding insert can slide along the inclined sliding hole, and the inclined sliding insert is provided with a buckling protrusion used for forming a buckling hole of a product in a protruding mode. The movable pin is arranged on the inclined sliding insert, a limiting hole is formed in the core pulling insert, the limiting hole is communicated with the inclined sliding hole, the two ends of the movable pin extend out of the limiting hole in a protruding mode, the movable pin can relatively slide along the limiting hole, a movable groove matched with the movable pin is formed in the upper mold core, and the movable pin can slide along the movable groove.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, and in particular to an injection mold with secondary core pulling. Background Technology

[0002] Currently, with the development of injection molding technology, the shapes of products in injection mold production are becoming more and more diverse and complex. Many products have undercut structures on their side walls. These products are characterized by their special undercut structures.

[0003] In existing technologies, demolding these types of products through a single strong core-pulling process is extremely difficult. Even if demolding is achieved through a single strong core-pulling process, the product may be damaged during demolding, affecting its appearance and functional dimensions, thereby reducing product yield. In addition, some manufacturers can successfully demold these products through a second core-pulling process; however, some molds with second core-pulling have more complex structures and higher failure rates, resulting in higher production and maintenance costs.

[0004] Therefore, it is necessary to design a mold with a relatively simple structure for the smooth demolding of this type of product, so that the product can be demolded smoothly and intact. Utility Model Content

[0005] The purpose of this invention is to propose a two-stage core-pulling injection mold to solve the problem that it is difficult to complete demolding of products with undercut structures in one stage.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A secondary core-pulling injection mold includes an upper mold plate and a lower mold plate. An upper mold core is mounted on the lower surface of the upper mold plate, and a lower mold core is mounted on the upper surface of the lower mold plate. A mold cavity for molding a product is provided between the upper and lower mold cores. The inner wall of the product has snap-fit ​​holes. The secondary core-pulling injection mold also includes a core-pulling mechanism. The core-pulling mechanism includes a core-pulling assembly extending from top to bottom through the upper mold plate and the upper mold core, and a drive assembly connected to the core-pulling assembly. The core-pulling assembly includes a core-pulling insert mounted on the upper mold core, a sliding insert movably mounted on the core-pulling insert, and a movable pin passing through the sliding insert. The drive assembly is used to drive the core-pulling insert to rise and fall. The lower end of the core-pulling insert extends... To the mold cavity, the core-pulling insert has a downwardly angled sliding hole that matches the angled sliding insert. The angled sliding insert can slide along the angled sliding hole and part of the angled sliding insert protrudes into the mold cavity. The lower end of the angled sliding insert has a snap-fit ​​protrusion for the snap-fit ​​hole of the molded product. The movable pin is set at the upper end of the angled sliding insert. The core-pulling insert has a limiting hole. The limiting hole is connected to the angled sliding hole, and the extension direction of the horizontal projection of the limiting hole is the same as the inclination direction of the angled sliding hole. The two ends of the movable pin protrude outside the limiting hole and can slide along the limiting hole. The upper mold core has a horizontally opening movable groove that matches the movable pin. The two ends of the movable pin abut against the movable groove and can slide along the movable groove.

[0008] Furthermore, the oblique sliding insert has a sliding part that is slidably disposed in the oblique sliding hole and a mating part connected to the sliding part. The lower end of the sliding part protrudes into the mold cavity, and the mating part is located at the lower end of the sliding part. The mating part is provided with a snap-fit ​​protrusion.

[0009] Furthermore, the upper end of the sliding part is provided with a pin hole that mates with the movable pin, and the movable pin passes through the pin hole.

[0010] Furthermore, the cross-sectional area of ​​the core-pulling insert gradually decreases from top to bottom along the horizontal direction.

[0011] Furthermore, the upper mold core has a through hole that mates with the core-pulling insert, and the core-pulling insert is installed in the through hole.

[0012] The core-pulling assembly also includes a mounting base on the upper mold core, with a through-hole for engaging with the core-pulling insert. The mounting hole is connected to the through hole.

[0013] Furthermore, the mounting base has a clearance hole through the limiting hole of the core-pulling insert, and the clearance hole is connected to the mounting hole.

[0014] Furthermore, the core-pulling assembly also includes a mounting base mounted above the mounting base.

[0015] Furthermore, the drive assembly is connected to the mounting base.

[0016] Furthermore, the injection mold for secondary core pulling also includes an ejector mechanism, which includes an ejector pin that penetrates the lower mold plate and the lower mold core from bottom to top. The ejector pin, the upper mold core, the lower mold core, and the core pulling mechanism together form a mold cavity, and the ejector pin is used to eject the product from the mold cavity.

[0017] The beneficial effects of this invention's secondary core-pulling injection mold are as follows: Through the cooperation of the core-pulling insert, the inclined sliding insert, the movable pin, the drive assembly, and the upper mold core, the core-pulling insert, while detaching from the product, simultaneously drives the inclined sliding insert to gradually detach from the product's locking hole, achieving the first core-pulling operation of the secondary core-pulling injection mold. Through the cooperation of the movable pin, the upper mold core, and the inclined sliding insert, the locking protrusion of the inclined sliding insert completely detaches from the locking hole and then completely separates from the product, achieving the second core-pulling operation of the secondary core-pulling injection mold. Therefore, the secondary core-pulling injection mold not only has a simple structure and achieves smooth product demolding through secondary core-pulling, but also avoids product damage during demolding, thereby improving product yield. Attached Figure Description

[0018] Figure 1 This is a cross-sectional view of a secondary core-pulling injection mold of this utility model before it is opened.

[0019] Figure 2 This is a partial schematic diagram of the first core pulling of a secondary core pulling injection mold according to the present invention.

[0020] Figure 3 This is a partial schematic diagram of an injection mold for secondary core pulling according to this utility model, before the second core pulling.

[0021] Figure 4 This is a partial schematic diagram of the second core pulling of an injection mold according to the present invention.

[0022] Figure 5 for Figure 2 A magnified diagram of point A in the middle.

[0023] Figure 6 This is a perspective view of the core-pulling assembly of this utility model.

[0024] Figure 7 for Figure 6 The exploded 3D view of the core-pulling assembly is shown.

[0025] Figure 8 for Figure 7 A perspective view of the oblique sliding insert of the core-pulling assembly shown.

[0026] Figure 9 for Figure 1 The diagram shows a three-dimensional representation of the mold core block.

[0027] Figure 10 for Figure 1A partial cross-sectional view of the core-pulling assembly shown. Detailed Implementation

[0028] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0029] The terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," "vertical," and "horizontal" used in the specification and claims of this utility model indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the purpose of expressing the technical solution clearly and for the convenience of description, and therefore should not be construed as limiting this application.

[0030] Please see Figure 1 , Figure 5 , Figure 7 , Figure 9 and Figure 10 A secondary core-pulling injection mold includes an upper mold plate 10 and a lower mold plate 30. An upper mold core 20 is installed on the lower surface of the upper mold plate 10, and a lower mold core 40 is installed on the upper surface of the lower mold plate 30. A mold cavity for molding a product 100 is provided between the upper mold core 20 and the lower mold core 40. The inner sidewall of the product 100 has a snap-fit ​​hole 101.

[0031] The injection mold for secondary core pulling also includes a core pulling mechanism 50. The core pulling mechanism 50 includes a core pulling assembly 51 that runs from top to bottom through the upper template 10 and the upper mold core 20, and a drive assembly 52 connected to the core pulling assembly 51. The core pulling assembly 51 includes a core pulling insert 511 disposed on the upper mold core 20, an inclined sliding insert 512 movably disposed on the core pulling insert 511, and a movable pin 513 passing through the inclined sliding insert 512. The drive assembly 52 is used to drive the core pulling insert 511 to rise and fall.

[0032] The lower end of the core-pulling insert 511 extends into the mold cavity. The core-pulling insert 511 has a downwardly angled sliding hole 5111 that cooperates with the angled sliding insert 512. The angled sliding insert 512 can slide along the angled sliding hole 5111 and part of the angled sliding insert 512 protrudes into the mold cavity. The lower end of the angled sliding insert 512 has a snap-fit ​​protrusion 5121 for forming the snap-fit ​​hole 101 of the product 100.

[0033] The movable pin 513 is disposed at the upper end of the inclined sliding insert 512. The core-pulling insert 511 has a limiting hole 5112. The limiting hole 5112 is connected to the inclined sliding hole 5111, and the horizontal projection of the limiting hole 5112 extends in the same direction as the inclination of the inclined sliding hole 5111. The two ends of the movable pin 513 protrude outside the limiting hole 5112, and the movable pin 513 can slide along the limiting hole 5112. The upper mold core 20 has a horizontally opened movable groove 23 that cooperates with the movable pin 513. The two ends of the movable pin 513 abut against the movable groove 23 and can slide along the movable groove 23.

[0034] Please see Figure 2 After the product 100 of the injection mold undergoes secondary core pulling is formed, the driving assembly 52 drives the core-pulling insert 511 to move upward, and the core-pulling insert 511 disengages from the product 100, completing the first core pulling. Since the two ends of the movable pin 513 abut against the movable groove 23 of the upper mold core 20, the movable pin 513 restricts the inclined sliding insert 512 from moving upward with the core-pulling insert 511. Simultaneously with the upward movement of the core-pulling insert 511, the movable pin 513 moves relative to the extension direction of the limiting hole 5112, and the inclined sliding insert 512 slides relative to the inclined sliding hole 5111. The inclined sliding insert 512 moves horizontally but does not move vertically, and the locking protrusion 5121 of the inclined sliding insert 512 disengages from the locking hole 101 of the product 100.

[0035] Please see Figure 3 After the first core pulling, when the movable pin 513 moves to the lowest end of the limiting hole 5112, the locking protrusion 5121 completely disengages from the locking hole 101.

[0036] Please see Figure 4 Subsequently, the injection mold for the second core pulling is opened, the upper mold plate 10 drives the upper mold core 20 to move upward, the upper mold core 20 drives the core pulling assembly 51 to move upward, and the oblique sliding insert 512 completely detaches from the product 100, completing the second core pulling.

[0037] As described above, the secondary core-pulling injection mold proposed in this utility model, through the cooperation of the core-pulling insert 511, the inclined sliding insert 512, the movable pin 513, the driving component 52, and the upper mold core 20, enables the core-pulling insert 511 to gradually disengage from the product 100 while simultaneously driving the inclined sliding insert 512 to gradually disengage from the snap-fit ​​hole 101 of the product 100, thus realizing the first core-pulling of the secondary core-pulling injection mold; through the cooperation of the movable pin 513, the upper mold core 20, and the inclined sliding insert 512, enables the snap-fit ​​protrusion 5121 of the inclined sliding insert 512 to completely disengage from the snap-fit ​​hole 101 and then completely disengage from the product 100, thus realizing the second core-pulling of the secondary core-pulling injection mold. Therefore, the injection mold with secondary core pulling not only has a simple structure and enables the smooth demolding of the product 100 through secondary core pulling, but also avoids the product 100 from being damaged during the demolding process, thereby improving the yield of the product 100.

[0038] Please see Figure 1 , Figure 9 and Figure 10 In this embodiment, the upper mold core 20 has a mold core block 21 and a pad block 22 detachably mounted on the upper surface of the mold core block 21. The upper surface of the mold core block 21 is recessed with the movable groove 23, and the pad block 22 is mounted on the upper surface of the mold core block 21 to prevent the movable pin 513 from dislodging from the movable groove 23. The cooperation between the mold core block 21 and the pad block 22 facilitates the disassembly, assembly, and maintenance of the core-pulling mechanism 50.

[0039] Please see Figure 8 The oblique sliding insert 512 has a sliding part 5122 that is slidably disposed in the oblique sliding hole 5111 and a mating part 5123 connected to the sliding part 5122. The lower end of the sliding part 5122 protrudes into the mold cavity, and the mating part 5123 is located at the lower end of the sliding part 5122. The mating part 5123 is provided with the buckle protrusion 5121.

[0040] The core-pulling insert 511, the sliding part 5122, the mating part 5123, the snap-fit ​​protrusion 5121, the mold core block 21, and the lower mold core 40 together form the mold cavity.

[0041] More specifically, the upper end of the sliding part 5122 is provided with a pin hole 5124 that cooperates with the movable pin 513, and the movable pin 513 passes through the pin hole 5124.

[0042] Please see Figure 1 , Figure 9 Figure 10The cross-sectional area of ​​the core-pulling insert 511 gradually decreases from top to bottom along the horizontal direction. A through hole 212, which mates with the core-pulling insert 511, is formed in the mold core block 21 of the upper mold core 20. The cross-sectional area of ​​the through hole 212 also gradually decreases from top to bottom along the horizontal direction, and the core-pulling insert 511 is installed in the through hole 212. Since the core-pulling insert 511 is not fixed to the upper mold core 20, the mating of the core-pulling insert 511 with the through hole 212 serves a positioning function, facilitating the installation of the core-pulling insert 511 onto the mold core block 21.

[0043] Please see Figure 1 , Figure 6 , Figure 7 , Figure 9 and Figure 10 The core-pulling assembly 51 further includes a mounting seat 514 disposed on the upper mold core 20. The mold core block 21 has a recessed receiving groove 211 for accommodating the mounting seat 514. The mounting seat 514 is disposed in the receiving groove 211, and the receiving groove 211 is connected to the through hole 212. The mounting seat 514 has a through-hole 5141 that mates with the core-pulling insert 511. The mounting hole 5141 is connected to the through hole 212. The core-pulling insert 511 is installed in the mounting hole 5141 and the through hole 212, and part of the core-pulling insert 511 protrudes into the mold cavity.

[0044] Furthermore, the cross-sectional area of ​​the mounting hole 5141 gradually decreases from top to bottom along the horizontal direction. When the driving component 52 drives the core-pulling component 51 to rise, the cooperation between the mounting hole 5141 and the core-pulling insert 511 enables the mounting base 514 to drive the core-pulling insert 511 to move upward.

[0045] Furthermore, the core-pulling assembly 51 also includes a fixing seat 515 mounted above the mounting base 514, the fixing seat 515 being used to prevent the core-pulling insert 511 from loosening during mold closing.

[0046] More specifically, the mounting base 514 has a clearance hole 5142 through the limiting hole 5112 of the core-pulling insert 511. The clearance hole 5142 is connected to the mounting hole 5141. The movable pin 513 passes through the clearance hole 5142 and can move along the clearance hole 5142. The clearance hole 5142 is used to avoid the movable pin 513 so that the two ends of the movable pin 513 can abut against the movable groove 23.

[0047] Please see Figure 1The driving assembly 52 is connected to the fixed base 515 via a connecting block 70, which passes through the upper template 10. The fixed base 515 passes through the pad 22 and is connected to the connecting block 70. The driving assembly 52 includes a first driving device 522 disposed on the upper template 10 and a core-pulling plate 521 connected to the movable end of the first driving device 522. The core-pulling plate 521 is movably disposed above the upper template 10 and connected to the connecting block 70. The first driving device 522 can drive the core-pulling plate 521 to rise and fall, thereby realizing the rising and falling of the core-pulling assembly 51.

[0048] Please see Figure 1 The secondary core-pulling injection mold also includes an ejector mechanism 60, which includes an ejector pin 61 that penetrates the lower mold plate 30 and the lower mold core 40 from bottom to top. The ejector pin 61, the upper mold core 20, the lower mold core 40, and the core-pulling mechanism 50 together form the mold cavity. The ejector pin 61 is used to eject the product 100 from the mold cavity. The ejector mechanism 60 also includes an ejector plate 62 and a second driving device 63. The ejector plate 62 is movably disposed below the lower mold plate 30. The second driving device 63 is used to drive the ejector plate 62 to rise and fall. One end of the ejector pin 61 away from the mold cavity is fixed on the ejector plate 62. When the mold is opened, the second driving device 63 can work to drive the ejector plate 62 to rise, thereby driving the ejector pin 61 to eject the product 100 upwards, completing the demolding.

[0049] The beneficial effects of the two-stage core-pulling injection mold of this utility model are as follows: The two-stage core-pulling injection mold not only has a simple structure, but also achieves smooth demolding of the product 100 through two-stage core pulling, and avoids the product 100 from being damaged during the demolding process, thereby improving the yield of the product 100.

[0050] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A secondary core-pulling injection mold, comprising an upper mold plate and a lower mold plate, wherein an upper mold core is mounted on the lower surface of the upper mold plate, a lower mold core is mounted on the upper surface of the lower mold plate, a mold cavity for molding a product is provided between the upper mold core and the lower mold core, and the inner wall of the product has snap-fit ​​holes, characterized in that, The injection mold for secondary core pulling also includes a core pulling mechanism. The core pulling mechanism includes a core pulling assembly that runs from top to bottom through the upper mold plate and the upper mold core, and a drive assembly connected to the core pulling assembly. The core pulling assembly includes a core pulling insert disposed on the upper mold core, a sliding insert movably disposed on the core pulling insert, and a movable pin passing through the sliding insert. The drive assembly is used to drive the core pulling insert to rise and fall. The lower end of the core-pulling insert extends to the mold cavity. The core-pulling insert is obliquely downwardly provided with an oblique sliding hole that cooperates with the oblique sliding insert. The oblique sliding insert can slide along the oblique sliding hole and the oblique sliding insert partially protrudes into the mold cavity. The lower end of the oblique sliding insert is provided with a snap-fit ​​protrusion for forming the snap-fit ​​hole of the product. The movable pin is disposed at the upper end of the inclined sliding insert. The core-pulling insert has a limiting hole, which is connected to the inclined sliding hole. The horizontal projection of the limiting hole extends in the same direction as the inclination of the inclined sliding hole. Both ends of the movable pin protrude outside the limiting hole and can slide along the limiting hole. The upper mold core has a horizontally opened movable groove that cooperates with the movable pin. Both ends of the movable pin abut against the movable groove and can slide along the movable groove.

2. The injection mold for secondary core pulling as described in claim 1, characterized in that, The oblique sliding insert has a sliding part that is slidably disposed in the oblique sliding hole and a mating part that is connected to the sliding part. The lower end of the sliding part protrudes into the mold cavity, and the mating part is located at the lower end of the sliding part. The mating part is provided with the snap-fit ​​protrusion.

3. The injection mold for secondary core pulling as described in claim 2, characterized in that, The upper end of the sliding part has a pin hole that mates with the movable pin, and the movable pin passes through the pin hole.

4. The injection mold for secondary core pulling as described in claim 1, characterized in that, The cross-sectional area of ​​the core-pulling insert gradually decreases from top to bottom along the horizontal direction.

5. The injection mold for secondary core pulling as described in claim 4, characterized in that, The upper mold core has a through hole that mates with the core-pulling insert, and the core-pulling insert is installed in the through hole.

6. The injection mold for secondary core pulling as described in claim 5, characterized in that, The core-pulling assembly also includes a mounting seat disposed on the upper mold core, the mounting seat having a through-hole that mates with the core-pulling insert, the mounting hole being connected to the through hole.

7. The injection mold for secondary core pulling as described in claim 6, characterized in that, The mounting base has a clearance hole through which the limiting hole of the core-pulling insert is opened, and the clearance hole is connected to the mounting hole.

8. The injection mold for secondary core pulling as described in claim 6, characterized in that, The core-pulling assembly also includes a mounting base installed above the mounting base.

9. The injection mold for secondary core pulling as described in claim 8, characterized in that, The drive assembly is connected to the fixed base.

10. The injection mold for secondary core pulling as described in claim 1, characterized in that, The secondary core-pulling injection mold also includes an ejector mechanism, which includes an ejector pin that penetrates the lower mold plate and the lower mold core from bottom to top. The ejector pin, the upper mold core, the lower mold core, and the core-pulling mechanism together form the mold cavity, and the ejector pin is used to eject the product from the mold cavity.

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