Thread twisting machining die

Abstract

The utility model discloses a twisted tooth machining die which comprises an upper die plate, a push plate, a lower die plate, a twisted tooth core and a core driving mechanism. A thread twisting part is arranged at the upper end of the thread twisting core, the thread twisting part is located in the upper mold plate, and the lower end of the thread twisting core sequentially penetrates through the push plate and the lower mold plate and is driven by the core driving mechanism to rotate; an upper through hole penetrating through the upper face and the lower face is formed in the push plate, a lower through hole corresponding to the upper through hole is formed in the lower die plate, a bearing seat protruding out of the upper surface of the lower die plate is fixed above the lower through hole, the bearing seat is arranged in the upper through hole in a penetrating and matched mode during die assembly, and an inner through hole is formed in the bearing seat. The inner through hole of the bearing seat and the lower through hole of the lower die plate are processed together and arranged concentrically, and the twisted tooth core is rotatably arranged in the concentric lower through hole and the inner through hole in a penetrating mode. The twisted tooth core only rotates in the inner through hole and the lower through hole, and the inner through hole and the lower through hole are processed together, so that the concentricity is consistent, the twisted tooth core is not easy to generate the problems of blockage, eccentricity and the like during rotation, and the processing precision can be ensured to meet the production requirement.

Description

Technical Field

[0001] The utility model relates to the technical field of mold processing, in particular to a thread cutting processing mold. Background Art

[0002] Injection molds are tools for producing plastic products; they are also tools that give plastic products a complete structure and precise dimensions. Injection molding is a processing method used in mass production of certain parts with complex shapes. Specifically, it refers to the process of injecting heated and melted plastic into the mold cavity under high pressure by an injection molding machine, and then cooling and solidifying to obtain a molded product.

[0003] The existing thread-cutting processing mold generally includes an upper template, a push plate, a lower template, a thread-cutting core and a core driving mechanism. The upper template, the push plate and the lower template are molded together in sequence. The upper end of the thread-cutting core has a thread-cutting portion, which is located in the upper template. The lower end of the thread-cutting core passes through the push plate and the lower template in sequence and is connected to the core driving mechanism. The core driving mechanism drives the thread-cutting core to rotate in the push plate and the lower template to realize the thread-cutting operation. However, since the existing push plate and the lower template are respectively processed with axial holes, and the existence of processing tolerances will cause the axial holes of the two to be insufficiently concentric, the thread-cutting core inserted in the axial holes of the push plate and the lower template will experience a certain degree of eccentric rotation or even jamming during rotation, which will affect the thread accuracy of the processed injection molded product. Utility Model Content

[0004] The utility model aims to provide a thread cutting processing die, which has the advantages of ensuring processing accuracy and avoiding jamming.

[0005] In order to achieve the above purpose, the solution of the utility model is:

[0006] A thread cutting die, comprising an upper die plate, a push plate, a lower die plate, a thread cutting core and a core driving mechanism;

[0007] The upper template, the push plate and the lower template are arranged up and down in sequence;

[0008] The upper end of the thread core has a thread part, which is located in the upper template. The lower end of the thread core passes through the push plate and the lower template in sequence and is connected to the core driving mechanism. The core driving mechanism is used to drive the thread core to rotate.

[0009] The push plate is provided with an upper through hole that passes through the upper and lower surfaces, and the lower template is provided with a lower through hole corresponding to the upper through hole. A bearing seat protruding from the upper surface of the lower template is fixed above the lower through hole. When the mold is closed, the bearing seat is inserted and matched in the upper through hole, and an inner through hole is provided in the bearing seat;

[0010] The inner through hole of the bearing seat and the lower through hole of the lower template are processed together and are concentrically arranged, and the thread core can be rotatably inserted into the concentric lower through hole and inner through hole.

[0011] Furthermore, an upper bearing slot hole is provided above the inner through hole, and a lower bearing slot hole is provided below the lower through hole. The lower bearing slot hole and the upper bearing slot hole are also processed together and are concentrically arranged. Bearings are arranged in the upper bearing slot hole and the lower bearing slot hole; the threaded core is installed to cooperate with the bearings in the upper bearing slot hole and the lower bearing slot hole.

[0012] Furthermore, a support plate is provided below the lower template; the core driving mechanism includes a driving motor, a driving spindle and a driving gear; the driving motor is installed on the side of the mold, the driving spindle is rotatably installed on the support plate, the upper end of the driving spindle extends upward into the lower template, the driving gear is installed on the upper end of the driving spindle, and a driven gear is installed below the bearing at the lower end of the threaded core, and the driven gear is meshed with the driving gear; the lower end of the driving spindle extends downward from the support plate, and is connected to the output end of the driving motor through a conveyor belt transmission.

[0013] Furthermore, there are four twisting tooth cores, each of which is vertically arranged and distributed in horizontal and vertical arrays inside the mold, and the driving spindle is located between the four twisting tooth cores; each twisting tooth core is provided with a driven gear, and each driven gear is synchronously meshed with the driving gear.

[0014] Furthermore, a mounting hole is recessed on the upper surface of the support plate, the lower end of the threaded core is extended into the mounting hole, and a wear-resistant block is sleeved on the lower end.

[0015] Furthermore, the upper surface of the lower template is recessed at the outer periphery of the lower through hole to form a mounting groove; the bearing seat has a bearing body and a mounting portion, the bearing body is movably inserted and fitted in the upper through hole, the mounting portion is located below the bearing body and has a diameter larger than the bearing body, and the mounting portion is embedded and fixed in the mounting groove.

[0016] Furthermore, it also includes a plurality of positioning pins; the lower template is provided with a plurality of first positioning holes arranged around the bearing body, the mounting portion is provided with a second positioning hole corresponding to the first positioning hole, and a third positioning hole is formed between the bearing body and the side wall of the upper through hole to align the first positioning holes, the third positioning hole includes a first groove formed on the side wall of the bearing body and a second groove formed on the inner wall of the upper through hole; each positioning pin passes through the first positioning hole, the second positioning hole and the third positioning hole in turn.

[0017] Furthermore, guide pillars are respectively erected at the four corners of the lower template, the four corners of the push plate are respectively provided with guide pillar through holes for the guide pillars to pass through, and the four corners of the upper template are respectively provided with guide pillar through holes for the guide pillars to pass through; a spring is also provided between the push plate and the lower template, and when the mold is closed, the spring is compressed.

[0018] Furthermore, a plurality of spring grooves are recessed on the upper surface of the lower template; a spring rod corresponding to the spring groove is locked on the push plate, the lower end of the spring rod passes through the push plate and extends into the spring groove of the lower template, and the spring is located in the spring groove and is sleeved on the spring rod.

[0019] Furthermore, an upper mold core is provided on the bottom surface of the upper mold plate, a cavity mold core is provided on the top surface of the push plate, and a product cavity is formed between the upper mold core and the cavity mold core; the threading part at the upper end of the threading core is movably extended and placed in the product cavity.

[0020] After adopting the above technical scheme, the threading core is set to rotate only in the inner through hole and the lower through hole. Since the two are processed together, the concentricity is consistent. It is not easy for the threading core to get stuck and eccentric when rotating. It can effectively guarantee the threading processing of the product by the threading part at the upper end of the threading core, and ensure that the processing accuracy meets the production requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a front view of an embodiment of the utility model;

[0022] Figure 2 It is a three-dimensional diagram of the structure of the lower part of the lower template of the embodiment of the utility model;

[0023] Figure 3 A three-dimensional diagram of the structure of the push plate and the upper part of the embodiment of the utility model;

[0024] Figure 4 A top view of an embodiment of the utility model;

[0025] Figure 5 for Figure 4 Sectional view at AA;

[0026] Figure 6 It is a partial structural exploded view of an embodiment of the utility model (I);

[0027] Figure 7 It is a partial structural exploded view of an embodiment of the utility model (II);

[0028] Figure 8 It is a partial structural stereogram of an embodiment of the utility model.

[0029] Explanation of reference numerals: upper template 1, guide post through hole 11, upper mold core 12, push plate 2, guide post through hole 21, spring rod 22, cavity mold core 23, upper through hole 24, lower template 3, spring groove 31, lower through hole 32, lower bearing slot hole 321, bearing seat 33, inner through hole 331, upper bearing slot hole 3311, bearing body 332, mounting portion 333, bearing 34, mounting groove 35, positioning pin 36, first positioning hole 37, second positioning hole 38, third positioning hole 39, first groove 391, second groove 392, threading core 4, threading portion 41, driven gear 42, wear-resistant block 43, core driving mechanism 5, driving motor 51, output end 511, driving spindle 52, driving gear 53, support plate 6, mounting hole 61, square iron 7, bottom plate 8, guide post 9, spring 10, product 20, product cavity 201. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0031] like Figure 1 As shown, a thread-cutting processing mold of the utility model comprises an upper template 1, a push plate 2, a lower template 3, a thread-cutting core 4, a core driving mechanism 5, a supporting plate 6, two square irons 7 and a bottom plate 8.

[0032] The upper template 1, the push plate 2, the lower template 3, the support plate 6, the square iron 7 and the bottom plate 8 are arranged in sequence up and down;

[0033] See also Figure 2 and Figure 3 The four corners of the lower template 3 are respectively provided with guide pillars 9, the four corners of the push plate 2 are respectively provided with guide pillar through holes 21 for the guide pillars 9 to pass through, and the four corners of the upper template 1 are respectively provided with guide pillar through holes 11 for the guide pillars 9 to pass through; a spring 10 is also provided between the push plate 2 and the lower template 3. When the mold is closed, the spring 10 is compressed.

[0034] Specifically, the upper surface of the lower template 3 may be concavely provided with a plurality of spring grooves 31, and four spring grooves 31 are used as an example in this embodiment; the push plate 2 is locked with a spring rod 22 corresponding to the spring groove 31, the lower end of the spring rod 22 passes through the push plate 2 and extends into the spring groove 31 of the lower template 3, and the spring 10 is located in the spring groove 31 and sleeved on the spring rod 22. The spring 10 is provided to assist in demolding the product 20 when the mold is opened.

[0035] For example Figures 2 to 7As shown, the upper end of the twisting thread core 4 has a twisting thread portion 41, which is located in the upper template 1. The lower end of the twisting thread core 4 passes through the push plate 2 and the lower template 3 in sequence, and is connected to the core driving mechanism 5. The core driving mechanism 5 is used to drive the twisting thread core 4 to rotate, so as to facilitate the core pulling and twisting of the product 20.

[0036] An upper mold core 12 is provided on the bottom surface of the upper mold plate 1, and a cavity mold core 23 is provided on the top surface of the push plate 2. A product cavity 201 is formed between the upper mold core 12 and the cavity mold core 23; the threading portion 41 at the upper end of the threading core 4 is movably extended into the product cavity 201 for injection molding.

[0037] The push plate 2 is provided with an upper through hole 24 that passes through the upper and lower surfaces, and the lower template 3 is provided with a lower through hole 32 corresponding to the upper through hole 24. A bearing seat 33 that protrudes from the upper surface of the lower template 3 is fixed above the lower through hole 32. When the mold is closed, the bearing seat 33 is inserted and fitted into the upper through hole 24, and an inner through hole 331 is provided in the bearing seat 33; the inner through hole 331 of the bearing seat 33 is processed together with the lower through hole 32 of the lower template 3 and is concentrically arranged, and the thread core 4 is rotatably inserted into the concentric lower through hole 32 and the inner through hole 331.

[0038] Thus, by setting the thread core 4 to rotate only in the inner through hole 331 and the lower through hole 32, the two are processed together and therefore have consistent concentricity, and the thread core 4 is not prone to problems such as jamming and eccentricity when rotating, which can effectively ensure the thread processing of the product 20 by the thread part 41 at the upper end of the thread core 4, and ensure that the processing accuracy meets the production requirements; this joint processing method is a prior art.

[0039] Specifically, Figures 5 to 7 As shown, an upper bearing slot 3311 is provided above the inner through hole 331, and a lower bearing slot 321 is provided below the lower through hole 32. The lower bearing slot 321 and the upper bearing slot 3311 are processed together and are concentrically arranged. Bearings 34 are arranged in the upper bearing slot 3311 and the lower bearing slot 321. The threaded core 4 is installed and matched with the bearings 34 in the upper bearing 34 hole 3311 and the lower bearing 34 hole 321. By providing two spaced bearings 34, the rotation stability of the threaded core 4 can be improved, and the possibility of eccentricity can be further reduced.

[0040] like Figure 1 , Figure 2 , Figure 5 and Figure 8 As shown, the core driving mechanism 5 includes a driving motor 51, a driving spindle 52 and a driving gear 53; the driving motor 51 can be installed on a rack arranged on the side of the mold, and the output end 511 of the driving motor 51 can be arranged downward.

[0041] The driving spindle 52 is rotatably mounted on the support plate 6, and the upper end of the driving spindle 52 extends upward into the lower template 3. The driving gear 53 is installed on the upper end of the driving spindle 52. A driven gear 42 is installed below the bearing 34 at the lower end of the threaded core 4, and the driven gear 42 is meshed with the driving gear 53. The lower end of the driving spindle 52 extends downward between the two square irons 7 above the bottom plate 8 of the support plate 6, and is connected to the output end 511 of the driving motor 51 through a conveyor belt (not shown).

[0042] In this embodiment, there can be four thread cores 4 to achieve batch production of the product 20 and improve production efficiency. The thread cores 4 are vertically arranged and distributed in horizontal and vertical arrays inside the mold. The driving spindle 52 is located between the four thread cores 4; each thread core 4 is provided with a driven gear 42, and each driven gear 42 is synchronously meshed with the driving gear 53.

[0043] like Figure 6 and Figure 7 As shown, the upper surface of the support plate 6 is concavely provided with a mounting hole 61, the lower end of the thread core 4 is extended into the mounting hole 61, and the lower end is sleeved with a wear-resistant block 43. This improves the wear resistance of the thread core 4, increases the service life of the mold, and reduces the number of maintenance and costs.

[0044] like Figure 5 As shown, the upper surface of the lower template 3 is recessed at the outer periphery of the lower through hole 32 to form a mounting groove 35; the bearing seat 33 has a bearing body 332 and a mounting portion 333, the bearing body 332 is movably inserted and fitted in the upper through hole 24, the mounting portion 333 is located below the bearing body 332, and has a diameter larger than the bearing body 332, and the mounting portion 333 is embedded and fixed in the mounting groove 35.

[0045] In order to enhance the connection stability between the bearing seat 33 and the lower mold plate 3 and to assist in mold closing for positioning, the mold of this embodiment further includes a plurality of positioning pins 36 .

[0046] The lower template 3 is provided with a plurality of first positioning holes 37 arranged around the bearing body 332, and the mounting portion 333 is provided with a second positioning hole 38 corresponding to the first positioning hole 37. The bearing body 332 and the side wall of the upper through hole 24 are aligned with the first positioning hole 37 to form a third positioning hole 39, and the third positioning hole 39 includes a first groove 391 formed on the side wall of the bearing body 332 and a second groove 392 formed on the inner wall of the upper through hole 24; each positioning pin 36 passes through the first positioning hole 37, the second positioning hole 38 and the third positioning hole 39 in sequence. In this way, the concentricity of the upper through hole 24, the inner through hole 331 and the lower through hole 32 in the upper template 1, the push plate 2 and the lower template 3 can be strengthened in the mold clamping state, and the stability of the rotation of the thread core 4 can be ensured.

[0047] The main working principle of the utility model is as follows: the material is injected into the product cavity 201 in the mold to form a product 20. When demolding, the driving motor 51 drives the driving spindle 52 to rotate, and the driving spindle 52 drives the four driven gears 42 to rotate synchronously through the driving gear 53, driving each thread core 4 to rotate, and at the same time the spring 10 assists the push plate 2 and the upper template 1 to separate from the lower template 3 and the thread core 4, so as to realize the core pulling and demolding operation, and the thread core 4 always rotates in the lower template 3 and the bearing seat 33, which can ensure that there is no jamming and eccentricity, and effectively improve the processing accuracy of the product 20.

[0048] The above is only a preferred embodiment of the utility model, and the protection scope of the utility model is not limited to the above embodiments. All technical solutions under the idea of ​​the utility model belong to the protection scope of the utility model. It should be pointed out that for ordinary technicians in this technical field, equivalent changes and modifications without departing from the principle of the utility model should still fall within the protection scope of the utility model.

[0049] In the description of the embodiments of the present application, it should be understood that the indicated orientation or position relationship is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the product 20 of the application is usually placed when in use, or is the orientation or position relationship commonly understood by those skilled in the art. It is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0050] In addition, the terms "first", "second", "third", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "multiple" and "several" is two or more, unless otherwise clearly and specifically defined.

Claims

1. A thread cutting die, characterized in that: It includes an upper template, a push plate, a lower template, a threaded core and a core driving mechanism; The upper template, the push plate and the lower template are arranged up and down in sequence; The upper end of the thread core has a thread part, which is located in the upper template. The lower end of the thread core passes through the push plate and the lower template in sequence and is connected to the core driving mechanism. The core driving mechanism is used to drive the thread core to rotate. The push plate is provided with an upper through hole that passes through the upper and lower surfaces, and the lower template is provided with a lower through hole corresponding to the upper through hole. A bearing seat protruding from the upper surface of the lower template is fixed above the lower through hole. When the mold is closed, the bearing seat is inserted and matched in the upper through hole, and an inner through hole is provided in the bearing seat; The inner through hole of the bearing seat and the lower through hole of the lower template are processed together and are concentrically arranged, and the thread core can be rotatably inserted into the concentric lower through hole and inner through hole.

2. A thread cutting die according to claim 1, characterized in that: An upper bearing slot is provided above the inner through hole, and a lower bearing slot is provided below the lower through hole. The lower bearing slot and the upper bearing slot are processed together and are concentrically arranged. Bearings are arranged in both the upper bearing slot and the lower bearing slot. The threaded core is installed to cooperate with the bearings in the upper bearing slot and the lower bearing slot.

3. A thread cutting die according to claim 2, characterized in that: A support plate is arranged below the lower template; the core driving mechanism comprises a driving motor, a driving spindle and a driving gear; the driving motor is installed on the side of the mold, the driving spindle is rotatably installed on the support plate, the upper end of the driving spindle extends upward into the lower template, the driving gear is installed on the upper end of the driving spindle, a driven gear is installed below the bearing at the lower end of the threaded core, and the driven gear is meshed with the driving gear; the lower end of the driving spindle extends downward from the support plate, and is connected to the output end of the driving motor through a conveyor belt transmission.

4. A thread cutting die according to claim 3, characterized in that: There are four twisting tooth cores, each of which is vertically arranged and distributed in horizontal and vertical arrays inside the mold. The driving spindle is located between the four twisting tooth cores; each twisting tooth core is provided with a driven gear, and each driven gear is synchronously meshed with the driving gear.

5. A thread cutting die according to claim 3, characterized in that: The upper surface of the support plate is concavely provided with a mounting hole, the lower end of the threaded core is extended into the mounting hole, and the lower end is sleeved with a wear-resistant block.

6. A thread cutting die according to claim 1, characterized in that: The upper surface of the lower template is recessed at the outer periphery of the lower through hole to form an installation groove; the bearing seat has a bearing body and a mounting portion, the bearing body is movably inserted and fitted in the upper through hole, the mounting portion is located below the bearing body and has a diameter larger than the bearing body, and the mounting portion is embedded and fixed in the installation groove.

7. A thread cutting die according to claim 6, characterized in that: It also includes a number of positioning pins; the lower template is provided with a number of first positioning holes arranged around the bearing body, the mounting portion is provided with a second positioning hole corresponding to the first positioning hole, and a third positioning hole is formed between the bearing body and the side wall of the upper through hole by aligning the first positioning holes, the third positioning hole includes a first groove formed on the side wall of the bearing body and a second groove formed on the inner wall of the upper through hole; each positioning pin passes through the first positioning hole, the second positioning hole and the third positioning hole in turn.

8. The thread cutting die according to claim 1, characterized in that: Guide pillars are respectively erected at the four corners of the lower template, the four corners of the push plate are respectively provided with guide pillar through holes for the guide pillars to pass through, and the four corners of the upper template are respectively provided with guide pillar through holes for the guide pillars to pass through; a spring is also provided between the push plate and the lower template, and when the mold is closed, the spring is compressed.

9. A thread cutting die according to claim 6, characterized in that: The upper surface of the lower template is concavely provided with a plurality of spring grooves; a spring rod corresponding to the spring groove is locked on the push plate, the lower end of the spring rod passes through the push plate and extends into the spring groove of the lower template, the spring is located in the spring groove and is sleeved on the spring rod.

10. The thread cutting die according to claim 1, characterized in that: The bottom surface of the upper mold plate is provided with an upper mold core, the top surface of the push plate is provided with a cavity mold core, and a product cavity is formed between the upper mold core and the cavity mold core; the threading part at the upper end of the threading core is movably extended and placed in the product cavity.

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