Thread demoulding die

Abstract

The invention relates to the technical field of molds, in particular to a thread demolding mold which comprises a movable mold and a fixed mold, a movable mold core and a fixed mold core are further arranged between the movable mold and the fixed mold, a forming cavity is reserved between the movable mold core and the fixed mold core, a movable through groove is formed in the bottom side of the fixed mold, a movable rack is inserted into the movable through groove, and a movable tooth is arranged in the movable rack. One end of the movable rack is connected with an oil cylinder for driving the movable rack to move; the upper side of the movable rack is meshed with a thread removing assembly, the thread removing assembly is in threaded connection with a product, and the movable rack drives the thread removing assembly to rotate and be separated from the interior of the product. The movable rack driven by the oil cylinder is arranged on the lower side of the fixed mold, the movable rack drives the thread disengaging assembly to rotate and be separated from the interior of a product, the whole device is simple in structure in the thread disengaging process, the whole thread disengaging process is simple and convenient, and the product demolding efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the field of moulds, and in particular relates to a screw thread removal mould. Background Art

[0002] Injection molds are jigs used for rapid prototyping of plastic products. Injection molds consist of two parts: a movable mold and a fixed mold. The movable mold is installed on the movable template of the injection molding machine, and the fixed mold is installed on the fixed template of the injection molding machine. During injection molding, the movable mold and the fixed mold are closed to form a casting system and a cavity. When the mold is opened, the movable mold and the fixed mold are separated to remove the plastic product. Among them, the casting system and the molding parts are in direct contact with the plastic, and they change with the plastic and the product. They are the most complex and most variable parts of the mold, and require the highest processing finish and precision. The casting system refers to the flow channel part before the plastic enters the cavity from the nozzle, including the main channel, cold material hole, diverter and gate, etc. Molding parts refer to various parts that constitute the shape of the product, including the movable mold, fixed mold and cavity, core, molding rod and exhaust port, etc.

[0003] At present, many precision plastic parts need to be processed with internal thread structures in order to be suitable for precision components. Generally, two methods are used for demolding: one is to use forced demolding when the plastic parts and structures allow it; the other is not suitable for forced demolding, such as plastic parts with deep threads, high plastic parts strength, and high thread precision requirements. Rotary demolding must be used for demolding, so a thread stripping mold needs to be designed to solve the above problems. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a thread stripping die to solve the problem mentioned in the above background technology that the thread stripping die on the existing market cannot be adapted to the demoulding of the internal threads of precision parts and has low working efficiency.

[0005] To achieve the above object, the technical solution of the present invention is as follows:

[0006] A screw removal mold comprises a movable mold and a fixed mold, a movable mold core and a fixed mold core are further provided between the movable mold and the fixed mold, a molding cavity is left between the movable mold core and the fixed mold core, a movable through groove is provided on the bottom side of the fixed mold, a movable rack is inserted in the movable through groove, one end of the movable rack is connected to a cylinder for driving the movable rack to move; a screw removal component is meshed on the upper side of the movable rack, the screw removal component is threadedly connected to the product, and the movable rack drives the screw removal component to rotate and separate from the product.

[0007] As a further improvement to the present invention, a mounting groove is provided on the fixed mold, the mounting groove and the movable through groove are vertically arranged, and a rolling groove is provided at the intersection of the mounting groove and the through groove.

[0008] As a further improvement of the present invention, the descrewing thread assembly is arranged in the mounting groove, and the descrewing thread assembly includes a driving gear meshing with the movable rack, the driving gear rotates in the rolling groove, a driving shaft is fixed in the driving gear, a driven gear is fixed on the driving shaft, and the driving shaft is rotatably connected to the fixed mold through a bearing.

[0009] As a further improvement of the present invention, a first module is provided on the upper side of the fixed mold near the mounting groove, a first gear is rotatably connected to the first module through a bearing, the first gear is meshed with the driven gear, a second gear is also meshed on the upper side of the first gear, a rotating shaft is fixed in the middle of the second gear, a thread is provided on the side of the rotating shaft close to the molding cavity, the other end of the rotating shaft is threadedly connected to a limiting gear, and a limiting groove is provided on the first module for engaging with the limiting gear.

[0010] As a further improvement to the present invention, the width of the limiting groove is greater than the width of the gear portion of the limiting gear.

[0011] As a further improvement of the present invention, second mold groups are provided in the other three directions above the fixed mold except the first mold group, and the second mold groups are adaptively close to or away from the molding cavity.

[0012] As a further improvement to the present invention, the diameter of the driven gear is greater than the diameter of the driving gear.

[0013] As a further improvement to the present invention, the movable through slot passes through the fixed mold, and the length of the movable rack is greater than the length of the movable through slot.

[0014] As a further improvement of the present invention, four groups of support rods are provided on a side of the mold away from the oil cylinder, and the support rods are provided at the four corners of the mold.

[0015] As a further improvement of the present invention, at least three groups of fixing grooves are further provided at the movable through groove, and fixing blocks are fixed in the fixing grooves, and the fixing blocks are used to prevent the movable rack from falling.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The present invention arranges a movable rack driven by an oil cylinder at the lower side of the fixed mold, and the movable rack drives the screw thread removal component to rotate and separate from the product to remove the screw thread. The whole device has a simple structure, and the whole screw thread removal process is simple and convenient, thereby improving the efficiency of product demoulding.

[0018] The present invention arranges a support rod on the side of the mold away from the oil cylinder. The support rod is used to provide space for the movement of the movable rack to prevent the movable rack from being damaged by collision during movement. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0021] Figure 2 It is a schematic diagram of the internal three-dimensional structure of the present invention;

[0022] Figure 3 It is a schematic diagram of the fixed mold three-dimensional structure of the present invention;

[0023] Figure 4 It is a schematic diagram of the internal three-dimensional structure of the present invention;

[0024] Figure 5 It is a schematic diagram of the three-dimensional structure of the screw removal assembly of the present invention;

[0025] Figure 6 It is a schematic diagram of the three-dimensional structure of the first module and the screw removal assembly of the present invention.

[0026] The names represented by the part numbers in the above 6 schematic diagrams are as follows:

[0027] 1. Moving mold; 22. Moving mold core;

[0028] 2. Fixed mold; 21. Fixed film core; 22. Movable through slot; 23. Mounting slot; 24. Rolling slot; 25. Fixed slot; 26. Fixed block;

[0029] 3. Movable rack;

[0030] 4. Oil cylinder;

[0031] 5. De-screwing assembly; 51. Driving gear; 52. Driving shaft; 53. Driven gear;

[0032] 6. First module; 61. First gear; 62. Second gear; 63. Rotating shaft; 64. Limiting gear; 65. Limiting groove;

[0033] 7. Second module;

[0034] 8. Support rod. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] The present invention provides the following embodiments:

[0037] A screw removal mold, comprising a movable mold 1 and a fixed mold 2, wherein a movable mold 1 core and a fixed mold core 21 are further provided between the movable mold 1 and the fixed mold 2, a molding cavity is left between the movable mold 1 core and the fixed mold core 21, a movable through groove 22 is provided on the bottom side of the fixed mold 2, a movable rack 3 is inserted in the movable through groove 22, and one end of the movable rack 3 is connected to an oil cylinder 4 for driving the movable rack 3 to move; a screw removal component 5 is meshed on the upper side of the movable rack 3, the screw removal component 5 is threadedly connected to the product, and the movable rack 3 drives the screw removal component 5 to rotate and separate from the product; by arranging a movable rack 3 driven by the oil cylinder 4 on the lower side of the fixed mold 2, the movable rack 3 drives the screw removal component 5 to rotate and separate from the product, so that the screw removal process is carried out, the whole device structure is simple, and the whole screw removal process is simple and convenient, thereby improving the efficiency of product demoulding;

[0038] The fixed mold 2 is provided with a mounting groove 23, and the mounting groove 23 is vertically arranged with the movable through groove 22, and a rolling groove 24 is provided at the intersection of the mounting groove 23 and the through groove; the screw removal assembly 5 is arranged in the mounting groove 23, and the screw removal assembly 5 includes a driving gear 51 meshing with the movable rack 3, and the driving gear 51 rotates in the rolling groove 24, and a driving shaft 52 is fixed in the driving gear 51, and a driven gear 53 is fixed on the driving shaft 52, and the driving shaft 52 is rotatably connected with the fixed mold 2 through a bearing; the diameter of the driven gear 53 is larger than the diameter of the driving gear 51; the oil cylinder 4 drives the movable rack 3 to move, and the movable rack 3 drives the driving gear 51 to move, and the movement of the driving gear 51 drives the rotation of the driving shaft 52 and the driven gear 53; at least three groups of fixed grooves 25 are also provided at the movable through groove 22, and a fixed block 26 is fixed in the fixed groove 25, and the fixed block 26 is used to prevent the movable rack 3 from falling;

[0039] The fixed mold 2 is provided with a first module 6 on the upper side near the mounting groove 23, and a first gear 61 is rotatably connected to the first module 6 through a bearing, and the first gear 61 is meshed with the driven gear 53, and a second gear 62 is also meshed on the upper side of the first gear 61, and a rotating shaft 63 is fixed in the middle of the second gear 62, and a thread is provided on the rotating shaft 63 near the molding cavity, and the other end of the rotating shaft 63 is threadedly connected to a limiting gear 64, and a limiting groove 65 engaged with the limiting gear 64 is provided on the first module 6; the width of the limiting groove 65 is greater than the width of the gear portion of the limiting gear 64; the driven gear 53 drives the first gear 61 to rotate, the first gear 61 drives the second gear 62 to rotate, and the second gear 62 drives the rotating shaft 63 to rotate, and the rotating shaft 63 rotates to drive the thread near the molding cavity to exit the product, completing demoulding, and then the rotating shaft 63 moves away from the molding cavity, and finally the limiting gear 64 is stuck in the limiting groove 65 and stops rotating;

[0040] The fixed mold 2 is provided with second mold groups 7 in the other three directions except the first mold group 6. The second mold groups 7 are adaptively close to or away from the molding cavity. The second mold groups 7 are close to the molding cavity during injection molding and away from the molding cavity during demoulding, and cooperate with the first mold group 6 to complete the injection molding and demoulding of the entire product.

[0041] The movable through groove 22 passes through the fixed mold 2, and the length of the movable rack 3 is greater than the length of the movable through groove 22; four groups of support rods 8 are provided on the side of the mold away from the cylinder 4, and the support rods 8 are provided at the four corners of the mold; by arranging the support rods 8 on the side of the mold away from the cylinder 4, the support rods 8 are used to provide space for the movement of the movable rack 3 to prevent the movable rack 3 from being damaged by collision during movement.

[0042] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A screw thread removal mold, comprising a movable mold (1) and a fixed mold (2), wherein a movable mold core (1) and a fixed mold core (21) are provided between the movable mold (1) and the fixed mold (2), and a molding cavity is left between the movable mold core (1) and the fixed mold core (21), characterized in that The bottom side of the fixed mold (2) is provided with a movable through groove (22), a movable rack (3) is inserted in the movable through groove (22), one end of the movable rack (3) is connected to an oil cylinder (4) for driving the movable rack (3) to move; the upper side of the movable rack (3) is meshed with a screw thread removal component (5), the screw thread removal component (5) is threadedly connected to the product, and the movable rack (3) drives the screw thread removal component (5) to rotate and separate from the product.

2. A screw thread removal die according to claim 1, characterized in that: The fixed mold (2) is provided with a mounting groove (23), the mounting groove (23) and the movable through groove (22) are arranged vertically, and a rolling groove (24) is provided at the intersection of the mounting groove (23) and the through groove.

3. A screw thread removal die according to claim 2, characterized in that: The screw-removing assembly (5) is arranged in the mounting groove (23), and comprises a driving gear (51) meshing with the movable rack (3); the driving gear (51) rotates in the rolling groove (24); a driving shaft (52) is fixed in the driving gear (51); a driven gear (53) is fixed on the driving shaft (52); and the driving shaft (52) is rotatably connected to the fixed mold (2) via a bearing.

4. A screw thread removal die according to claim 3, characterized in that: The fixed mold (2) is provided with a first mold assembly (6) on the upper side close to the mounting groove (23); a first gear (61) is rotatably connected to the first mold assembly (6) via a bearing; the first gear (61) is meshed with the driven gear (53); a second gear (62) is also meshed on the upper side of the first gear (61); a rotating shaft (63) is fixed in the middle of the second gear (62); a thread is provided on one side of the rotating shaft (63) close to the molding cavity; the other end of the rotating shaft (63) is threadedly connected to a limit gear (64); and a limit groove (65) is provided on the first mold assembly (6) and is engaged with the limit gear (64).

5. A screw thread removal die according to claim 4, characterized in that: The width of the limiting groove (65) is greater than the width of the gear portion of the limiting gear (64).

6. A screw thread removal die according to claim 5, characterized in that: Second mold groups (7) are provided above the fixed mold (2) in the other three directions except the first mold group (6), and the second mold groups (7) are adaptively close to or away from the molding cavity.

7. A screw thread removal die according to claim 6, characterized in that: The diameter of the driven gear (53) is greater than the diameter of the driving gear (51).

8. A screw thread removal die according to claim 7, characterized in that: The movable through slot (22) passes through the fixed mold (2), and the length of the movable rack (3) is greater than the length of the movable through slot (22).

9. A screw thread removal die according to claim 8, characterized in that: Four groups of support rods (8) are arranged on one side of the mold away from the oil cylinder (4), and the support rods (8) are arranged at the four corners of the mold.

10. A screw thread removal die according to claim 9, characterized in that: At least three groups of fixing grooves (25) are also provided at the movable through groove (22), and fixing blocks (26) are fixed in the fixing grooves (25). The fixing blocks (26) are used to prevent the movable rack (3) from falling off.

Images