Injection mold structure for removing helical gear

Abstract

The utility model discloses an injection mold structure for removing a helical gear, which comprises a fixed mold assembly, a movable mold assembly and a helical gear removing mechanism, the movable mold assembly comprises a movable mold plate, a movable mold base plate, a foot pad, an ejector pin panel, an ejector pin fixing plate, a movable mold fixing plate and an insert assembly, the insert assembly comprises a movable mold insert, an insert supporting seat, a cooling waterway insert, a shifting rod and an insert pressing ring, the insert supporting seat is arranged in the movable mold plate, the movable mold insert is rotatably arranged on the insert supporting seat, a bevel gear forming cavity is formed in the inner side of the movable mold insert, and the shifting rod is arranged in the bevel gear forming cavity. The cooling waterway insert is arranged on the movable mold fixing plate and concentrically extends upwards into a helical gear forming cavity in the movable mold insert, and the deflector rod is vertically arranged on the ejector pin fixing plate. Through the mode, the injection mold structure for demolding the bevel gear can realize smooth demolding of a bevel gear injection molding part, reduces the stress of the bevel gear injection molding part, and ensures the structural precision.

Description

Technical Field

[0001] The utility model relates to the field of injection molds, in particular to an injection mold structure for helical gears. Background Art

[0002] With the development of the automotive industry, more and more auto parts are being made of plastic instead of steel. For gears in low-load mechanical transmissions, the advantages of plastic gear transmissions are becoming increasingly apparent. For helical gears, the higher the precision requirements, the higher the requirements for mold structure and demolding methods.

[0003] The invention patent application with application number 2020110811164 discloses a mold mechanism for pushing out helical teeth by a push plate. The product is moved upward by the push plate, and the product is used to drive the helical tooth core to passively rotate on the ball bearing when the product moves upward, thereby realizing the action of removing the helical gear. However, the rotational force of the helical tooth core is transmitted through the product, causing the product to be subjected to greater force and prone to micro-deformation, with poor surface finish and many defects, which is not conducive to the production of high-precision helical gears and needs to be improved. Utility Model Content

[0004] The main technical problem solved by the utility model is to provide an injection mold structure for removing helical gears, so as to carry out demoulding of the helical gear plastic parts and avoid the problem of stress deformation of the helical gears.

[0005] In order to solve the above technical problems, a technical solution adopted by the present invention is: to provide an injection mold structure for a bevel gear, comprising: a fixed mold assembly, a movable mold assembly and a bevel gear mechanism, wherein the fixed mold assembly comprises a fixed mold plate located above the movable mold assembly, the movable mold assembly comprises a movable mold plate, a movable mold pad, a pad, an ejector panel, an ejector fixing plate, a movable mold fixing plate and an insert assembly, the insert assembly comprises a movable mold insert, an insert support seat, a cooling water channel insert, a shift rod and an insert pressure ring, the movable mold plate is arranged above the movable mold pad, the pad is symmetrically arranged at the bottom of the movable mold pad, the movable mold fixing plate is arranged below the pad, and the insert support seat is arranged at the movable mold pad. In the template, the movable mold insert is rotatably arranged on the insert support seat, the insert pressure ring is arranged on the top of the insert support seat to limit the upper edge of the movable mold insert, a helical gear forming cavity is arranged on the inner side of the movable mold insert, the ejector fixing plate is arranged between the movable mold pad and the movable mold fixing plate, the ejector panel is arranged on the top of the ejector fixing plate, the cooling water channel insert is arranged on the movable mold fixing plate and extends concentrically upward to the helical gear forming cavity in the movable mold insert, the shift rod is vertically arranged on the ejector fixing plate, the movable mold insert is provided with an oblique groove located above the shift rod and inclined along the circumference of the movable mold insert, and the top of the shift rod is provided with a shift block extending into the oblique groove.

[0006] In a preferred embodiment of the present invention, an embedding groove corresponding to the insert support seat is provided in the movable template.

[0007] In a preferred embodiment of the present invention, the movable mold insert adopts an annular structure, and the bottom of the insert pressure ring is concavely provided with an annular groove corresponding to the movable mold insert.

[0008] In a preferred embodiment of the present invention, circular arc grooves are circumferentially spaced apart at the bottom of the movable mold insert, and positioning pins are provided on the insert support seat and extend vertically into the circular arc grooves.

[0009] In a preferred embodiment of the present invention, the ejector fixing plate is provided with a through hole corresponding to the cooling water channel insert.

[0010] In a preferred embodiment of the present invention, the number of the shifting rods is 3, and the 3 shifting rods are distributed in a circular array around the axial direction of the movable mold insert.

[0011] In a preferred embodiment of the present invention, the insert pressure ring is provided with an avoidance groove located above the shift rod.

[0012] In a preferred embodiment of the present invention, a guide hole corresponding to the shift rod is provided in the insert support seat.

[0013] In a preferred embodiment of the present invention, a push rod penetrating downwardly through the movable mold fixing plate is provided at the bottom of the push pin fixing plate, and an push pin extending upwardly into the helical gear forming cavity in the movable mold insert is provided on the push pin fixing plate.

[0014] In a preferred embodiment of the present invention, the ejector pin adopts a sleeve structure and is sleeved on the outside of the cooling water channel insert.

[0015] The beneficial effects of the utility model are as follows: the utility model points out an injection mold structure for removing a helical gear. After the mold is opened, the ejector fixing plate moves under the action of the ejector rod, driving the ejector and the shift rod to move synchronously, so that the helical gear injection molded part moves outward while the movable mold insert rotates slightly, thereby realizing smooth demolding of the helical gear injection molded part, reducing the force on the helical gear injection molded part, and being conducive to ensuring the accuracy and yield rate of the helical gear injection molded part. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work. Among them:

[0017] Figure 1This is a structural diagram of a preferred embodiment of an injection mold structure for a helical gear of the utility model;

[0018] Figure 2 yes Figure 1 A top view of the middle moving mold assembly;

[0019] Figure 3 yes Figure 2 AA section view;

[0020] Figure 4 yes Figure 1 A partial enlarged view of part B;

[0021] Figure 5 yes Figure 1 Schematic diagram of the structure of the middle insert assembly. DETAILED DESCRIPTION

[0022] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] See also Figures 1 to 5 , the embodiments of the present utility model include:

[0024] like Figures 1 to 3 The injection mold structure of the de-bevel gear shown includes: a fixed mold assembly, a movable mold assembly and a de-bevel gear mechanism. The fixed mold assembly includes a fixed mold plate 1 located above the movable mold assembly. The movable mold assembly includes a movable mold plate 2, a movable mold pad 3, a pad 12, an ejector panel 10, an ejector fixing plate 11, a movable mold fixing plate 6 and an insert assembly. The movable mold plate 2 is arranged above the movable mold pad 3, the pad 12 is symmetrically arranged at the bottom of the movable mold pad 3, and the movable mold fixing plate 6 is arranged below the pad 12. The pad 12 is used to ensure the gap between the movable mold fixing plate 6 and the movable mold pad 3.

[0025] The ejector plate 11 is positioned between the movable mold backing plate 3 and the movable mold fixing plate 6. The ejector panel 10 is positioned on top of the ejector plate 11. Screws are used to secure the ejector panel 10 and the ejector plate 11, ensuring good synchronization. A push rod 9 is positioned at the bottom of the ejector plate 6, extending downward through the movable mold fixing plate 6, to facilitate driving the ejector plate 6.

[0026] like Figure 4 and Figure 5As shown, the insert assembly includes a movable mold insert 15, an insert support seat 4, a cooling water channel insert 7, a shift rod 8 and an insert pressure ring 13. The insert support seat 4 is arranged in the movable mold plate 2. In this embodiment, an embedding groove corresponding to the insert support seat 4 is provided in the movable mold plate 2, which is more accurate in positioning and convenient for assembly.

[0027] A movable mold insert 15 is rotatably mounted on the insert support 4. A helical gear molding cavity 16 is provided within the movable mold insert 15. After the molds are closed, it mates with the fixed mold insert in the fixed mold plate 1 to perform the injection molding of the helical gear. In this embodiment, circular arc grooves 14 are circumferentially spaced apart on the bottom of the movable mold insert 15. The insert support 4 is provided with locating pins 17 extending vertically into the circular arc grooves 14. The three sets of circular arc grooves 14 and locating pins 17 cooperate to guide the rotation of the movable mold insert 15, preventing misalignment.

[0028] The insert pressing ring 13 is arranged at the top of the insert support seat 4 to limit the upper edge of the movable mold insert 15. In this embodiment, the movable mold insert 15 adopts an annular structure, and the bottom of the insert pressing ring 13 is concavely provided with an annular groove 18 corresponding to the movable mold insert 15 to limit the top of the edge of the movable mold insert 15, thereby avoiding the problem of the movable mold insert 15 flying off and not affecting the rotation of the insert pressing ring 13.

[0029] The cooling water channel insert 7 is mounted on the movable mold plate 6 and extends concentrically upward into the helical gear molding cavity 16 within the movable mold insert, assisting in the injection molding and cooling of the helical gear. A through hole corresponding to the cooling water channel insert 7 is provided in the ejector plate 11, which does not affect the movement of the ejector plate 11.

[0030] like Figure 1 As shown, ejector pins 5 are mounted on ejector pin retaining plate 11 and extend upward into helical gear molding cavity 16 within movable mold insert 15. After mold opening, ejector pin retaining plate 11 rises, driving ejector pins 5 within helical gear molding cavity 16 to eject the helical gear injection molded part. In this embodiment, ejector pins 5 utilize a sleeve structure and are positioned around the exterior of cooling water channel insert 7, which guides ejector pins 5. Furthermore, the sleeve structure's large cross-section effectively minimizes damage to the helical gear injection molded part and prevents deformation during ejection.

[0031] The lever 8 is vertically arranged on the ejector fixing plate 11 and can be raised along with the ejector fixing plate 11 after the mold is opened. Figure 5 As shown, a guide hole 21 corresponding to the shift rod 8 is provided in the insert support seat 4 to guide the telescopic movement of the shift rod 8. A avoidance groove 22 above the shift rod 8 is provided on the insert pressure ring 13 so as not to affect the telescopic movement of the shift rod 8.

[0032] The movable mold insert 15 is provided with an inclined slot 19 located above the lever 8 and circumferentially inclined along the movable mold insert 15. A shift block 20 is mounted on the top of the lever 8, extending into the inclined slot 19. When the lever 8 is raised, the shift block 20's movement in the inclined slot 19 forces the movable mold insert 15 to rotate slightly. This, in conjunction with the ejection of the helical gear molded part by the ejector pin 5, allows the movable mold insert 15 to rotate slightly during the ejection process, allowing the helical gear molded part to be smoothly ejected from the helical gear molding cavity 16 of the movable mold insert 15, avoiding deformation. In this embodiment, there are three levers 8, arranged in a circular array around the axial direction of the movable mold insert 15. The simultaneous engagement of the three sets of shift blocks 20 with the inclined slots 19 ensures smooth rotation of the movable mold insert 15.

[0033] In summary, the injection mold structure for demolding helical gears pointed out in the present invention can twist the movable mold insert when the helical gear injection molded part is ejected, which can not only ensure the smooth demolding of the helical gear injection molded part, but also reduce the problem of stress deformation of the helical gear injection molded part, which is beneficial to improving the dimensional accuracy and appearance quality of the helical gear injection molded part.

[0034] The above are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An injection mold structure for a helical gear, characterized in that: include: A fixed mold assembly, a movable mold assembly and a de-bevel gear mechanism, wherein the fixed mold assembly includes a fixed mold plate located above the movable mold assembly, the movable mold assembly includes a movable mold plate, a movable mold pad, a pad foot, an ejector panel, an ejector fixing plate, a movable mold fixing plate and an insert assembly, the insert assembly includes a movable mold insert, an insert support seat, a cooling water channel insert, a shift rod and an insert pressure ring, the movable mold plate is arranged above the movable mold pad, the pad foot is symmetrically arranged at the bottom of the movable mold pad, the movable mold fixing plate is arranged below the pad foot, the insert support seat is arranged in the movable mold plate, and the movable mold insert is rotatably arranged on the insert support seat The insert pressure ring is arranged on the top of the insert support seat to limit the position above the edge of the movable mold insert. A helical gear forming cavity is arranged on the inner side of the movable mold insert. The ejector fixing plate is arranged between the movable mold pad and the movable mold fixing plate. The ejector panel is arranged on the top of the ejector fixing plate. The cooling water channel insert is arranged on the movable mold fixing plate and extends concentrically upward into the helical gear forming cavity in the movable mold insert. The shift rod is vertically arranged on the ejector fixing plate. The movable mold insert is provided with an oblique groove located above the shift rod and inclined along the circumference of the movable mold insert. The top of the shift rod is provided with a shift block extending into the oblique groove.

2. The injection mold structure of the helical gear according to claim 1, characterized in that: The movable template is provided with an embedding groove corresponding to the insert support seat.

3. The injection mold structure of the helical gear according to claim 1, characterized in that: The movable mold insert adopts an annular structure, and the bottom of the insert pressure ring is concavely provided with an annular groove corresponding to the movable mold insert.

4. The injection mold structure of the helical gear according to claim 1, characterized in that: The bottom of the movable mold insert is provided with circular arc grooves at intervals in the circumferential direction, and the insert support seat is provided with positioning pins extending vertically into the circular arc grooves.

5. The injection mold structure of the helical gear according to claim 1, characterized in that: The ejector fixing plate is provided with a through hole corresponding to the cooling water channel insert.

6. The injection mold structure of the helical gear according to claim 1, characterized in that: The number of the shifting rods is 3, and the 3 shifting rods are distributed in a ring array around the axial direction of the movable mold insert.

7. The injection mold structure of the helical gear according to claim 1, characterized in that: The insert pressure ring is provided with an avoidance groove located above the shifting rod.

8. The injection mold structure of the helical gear according to claim 1, characterized in that: A guide hole corresponding to the shift rod is provided in the insert support seat.

9. The injection mold structure of the helical gear according to claim 1, characterized in that: The bottom of the ejector fixing plate is provided with an ejector rod which penetrates downwardly through the movable mold fixing plate, and the ejector fixing plate is provided with an ejector which extends upward into the helical gear forming cavity in the movable mold insert.

10. The injection mold structure of the helical gear according to claim 9, characterized in that: The ejector pin adopts a sleeve structure and is sleeved on the outside of the cooling water channel insert.

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