CN218519080U

CN218519080U - Mould is used in processing of screw thread product

Info

Publication number: CN218519080U
Application number: CN202222348835.9U
Authority: CN
Inventors: 潘小航
Original assignee: Dongguan Xingchuang Precision Mould Co ltd
Current assignee: Dongguan Xingchuang Precision Mould Co ltd
Priority date: 2022-09-02
Filing date: 2022-09-02
Publication date: 2023-02-24
Anticipated expiration: 2032-09-02

Abstract

A die for processing a threaded product comprises a fixed die, a mandrel and a movable die assembly, wherein a step part is arranged at the bottom end of the fixed die; the cross section of the mandrel is polygonal, and all side surfaces of the mandrel are gradually expanded outwards from the bottom end to the top end; the movable die assembly comprises a first forming piece and a second forming piece, the first forming piece and the second forming piece are arranged along the side surface of the mandrel in a sliding mode, the first forming piece and the second forming piece are multiple, the first forming piece and the second forming piece are spliced in a staggered mode along the circumferential direction of the mandrel to form a cylinder, and external threads are arranged on the outer sides of the first forming piece and the second forming piece to form an internal thread product; the bottom of first shaping spare sets up first butt portion, and the bottom of second shaping spare sets up second butt portion, and first butt portion all is used for butt step portion with second butt portion. When the mold for processing the threaded product is used for injection molding, the mandrel drives the first forming piece and the second forming piece to simultaneously expand outwards; when the mold needs to be opened, the mandrel drives the first forming piece and the second forming piece to retract simultaneously, so that the mold is convenient to release.

Description

Mould is used in processing of screw thread product

Technical Field

The utility model relates to a mould processing technology field especially relates to a mould is used in processing of screw thread product.

Background

A plastic mould is a tool matched with a plastic forming machine in the plastic processing industry to endow plastic products with complete configuration and accurate dimension, and is a tool for producing the plastic products, and the plastic mould is composed of a plurality of parts, and a forming mould cavity is arranged in the combination. During injection molding, the mold is clamped on an injection molding machine, molten plastic is injected into a forming mold cavity and is cooled and shaped in the cavity, then the front mold and the rear mold are separated, a product is ejected out of the mold cavity through an ejection system and leaves the mold, finally, the mold is closed again for next injection molding, and the whole injection molding process is carried out in a circulating mode.

The plastic part with the full-circle inner side reverse buckling characteristic means that the inner wall of the circular plastic part is provided with a side bulge or a side recess, such as precision internal thread products, various plastic covers, water pipe connectors and other structural plastic parts. The key of this type of plastic parts of injection moulding lies in the drawing of core of inboard back-off, and the drawing of core drawing is rotatory for the spiral mostly that adopts at present, installs a screw thread mold insert in the die cavity of mould usually, and after the product cooling shaping, the screw thread mold insert is rotatory to be loosed core and then break away from the mould, and it is ejecting with the product through corresponding thimble structure at last, however, this internal thread that probably leads to the product warp, perhaps produces the burr, leads to product quality low.

SUMMERY OF THE UTILITY MODEL

Based on this, it is necessary to provide a die for machining a threaded product, which aims at the problem that the internal thread of the product may be deformed when machining the internal threaded product in the prior art.

A die for processing a threaded product comprises a fixed die, a mandrel and a movable die assembly, wherein the fixed die is in a hollow cylindrical shape, and a step part is arranged at the bottom end of the fixed die; the cross section of the mandrel is polygonal, and all side surfaces of the mandrel are gradually expanded outwards from the bottom end to the top end; the movable die assembly comprises a first forming piece and a second forming piece, the first forming piece and the second forming piece are arranged along the side surface of the mandrel in a sliding mode, the first forming piece and the second forming piece are multiple, the first forming piece and the second forming piece are spliced in a staggered mode along the circumferential direction of the mandrel to form a cylinder, and external threads are arranged on the outer sides of the first forming piece and the second forming piece to form an internal thread product; the bottom end of the first forming piece is provided with a first abutting part, the bottom end of the second forming piece is provided with a second abutting part, and the first abutting part and the second abutting part are both used for abutting against the step part.

In one embodiment, a first limiting part is arranged on the outer side of the first forming part, a second limiting part is arranged on the outer side of the second forming part, and the top end of the fixed die is used for abutting against the first limiting part and the second limiting part.

In one embodiment, a first guide rail part and a second guide rail part are arranged on the outer side of the mandrel, the first guide rail part and the second guide rail part are multiple, a first sliding groove is formed in the inner side of the first forming part to accommodate the first guide rail part, and a second sliding groove is formed in the inner side of the second forming part to accommodate the second guide rail part.

In one embodiment, the mandrel is provided with reference lines corresponding to the side faces of the first guide rail part.

In one embodiment, the first rail portion has a width greater than a width of the second rail portion.

In one embodiment, the inner side of the first profile abuts the side of the mandrel on which the first rail portion is disposed; the inner side surface of the second forming piece is abutted to the side surface of the mandrel on which the second guide rail part is arranged.

In one embodiment, the included angle between the side surface of the mandrel, on which the first guide rail part is arranged, and the horizontal plane ranges from 70 degrees to 80 degrees; the included angle range of the side face of the mandrel, which is provided with the second guide rail part, and the horizontal plane is 80-88 degrees.

In one embodiment, the side surface of the mandrel, on which the first guide rail part is arranged, forms an included angle of 78 degrees with the horizontal plane; the side face of the mandrel, which is provided with the second guide rail part, forms an included angle of 84 degrees with the horizontal plane.

In one embodiment, the top ends of the first molding part and the second molding part are used for abutting against an external fixed block.

In one embodiment, the sidewall of the first profile abuts the sidewall of the second profile.

Compared with the prior art, the beneficial effects of the utility model are as follows:

the utility model discloses a mould for processing threaded products, which forms a cylinder with external threads by splicing a first forming part and a second forming part along the circumferential direction of a mandrel; when in injection molding, the mandrel drives the first abutting part and the second abutting part to abut against the step part, so that the first forming piece and the second forming piece are simultaneously expanded; when the mold needs to be opened, the mandrel drives the first forming piece and the second forming piece to simultaneously retract, so that the mold is convenient to release, and the product quality is good.

Drawings

Fig. 1 is an assembly structure diagram of a mold for processing a threaded product according to a preferred embodiment of the present invention;

FIG. 2 is a sectional view of the die for machining a threaded product shown in FIG. 1;

FIG. 3 is a schematic structural view of a mandrel and a movable die assembly of the die for machining the threaded product shown in FIG. 1;

fig. 4 is an exploded view of fig. 3.

Reference is made to the accompanying drawings in which:

a mold 100 for machining a threaded product;

the fixed die comprises a fixed die 10, a step part 11, a mandrel 20, a first guide rail part 21, a second guide rail part 22, a datum line 23, a movable die assembly 30, a first molding piece 31, a first abutting part 311, a first limiting part 312, a first sliding groove 313, a second molding piece 32, a second abutting part 321, a second limiting part 322, a second sliding groove 323, an oil cylinder 91 and a fixed block 92.

Detailed Description

In order to facilitate understanding of the present invention, the present invention will be described more fully below. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When the number of an element is referred to as "a plurality," it can be any number of two or more. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a single embodiment.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1 to 4, in order to provide the mold 100 for processing a threaded product according to an embodiment of the present invention, the mold includes a fixed mold 10, a mandrel 20 and a movable mold assembly 30, a step portion 11 is disposed at a bottom end of the fixed mold 10, the movable mold assembly 30 includes a first molded part 31 and a second molded part 32, a first abutting portion 311 is disposed at a bottom end of the first molded part 31, and a second abutting portion 321 is disposed at a bottom end of the second molded part 32, the mold 100 for processing a threaded product of the present invention forms a cylinder with an external thread by splicing the first molded part 31 and the second molded part 32 along a circumferential direction of the mandrel 20; during injection molding, the mandrel 20 drives the first abutting portion 311 and the second abutting portion 321 to abut against the step portion 11, so that the first molding piece 31 and the second molding piece 32 are simultaneously expanded; when the mold needs to be opened, the mandrel 20 drives the first molding part 31 and the second molding part 32 to simultaneously retract, so that the demolding is facilitated, and the product quality is good.

As shown in fig. 1 and 2, in the present embodiment, the fixed mold 10 has a hollow cylindrical shape, and a step 11 is provided at the bottom end of the fixed mold 10; optionally, a through hole is formed in one side of the fixed mold 10 so that molten materials of the injection molding machine can enter the through hole; when in use, the fixed die 10 is fixedly arranged on an injection molding machine.

As shown in fig. 1 to 4, the mandrel 20 penetrates through the fixed mold 10, the cross section of the mandrel 20 is polygonal, each side surface of the mandrel 20 gradually expands outwards from the bottom end to the top end, and one end of the mandrel 20 is connected with an external oil cylinder 91; optionally, a first guide rail part 21 and a second guide rail part 22 are arranged outside the mandrel 20, the first guide rail part 21 and the second guide rail part 22 are multiple, and the first guide rail part 21 and the second guide rail part 22 are arranged in a staggered manner; further, the width of the first rail part 21 is larger than the width of the second rail part 22. The side surface of the mandrel 20 corresponding to the first guide rail part 21 is provided with a reference line 23, when the mandrel 20 is driven by the oil cylinder 91 to ascend, and when the reference line 23 exceeds the movable mold assembly 30, the mandrel is ascended to the right position, so that the use by a user is facilitated. The included angle between the side surface of the mandrel 20 provided with the first guide rail part 21 and the horizontal plane is 70-80 degrees; the included angle between the side surface of the mandrel 20 provided with the second guide rail part 22 and the horizontal plane is 80-88 degrees; optionally, the side of the mandrel 20 where the first guide rail part 21 is arranged is in a range of 78 degrees from the horizontal plane; the side of the mandrel 20 where the second guide rail part 22 is arranged forms an angle of 84 degrees with the horizontal plane. In one embodiment, the cross-section of the mandrel 20 is hexagonal, and there are three first guide rail portions 21 and three second guide rail portions 22.

Referring to fig. 1 and 4 again, the movable mold assembly 30 is disposed through the fixed mold 10, the movable mold assembly 30 includes a first mold member 31 and a second mold member 32, the first mold member 31 and the second mold member 32 are slidably disposed along a side surface of the core shaft 20, and optionally, an inner side surface of the first mold member 31 abuts against a side surface of the core shaft 20 where the first guide rail portion 21 is disposed; the inner side surface of the second molded part 32 abuts against the side surface of the mandrel 20 where the second guide rail part 22 is arranged, and plays a role in guiding. Further, the inner side surface of the first molded member 31 is disposed obliquely, and the inner side surface of the second molded member 32 is disposed obliquely. In one embodiment, the sidewall of the first forming member 31 abuts the sidewall of the second forming member 32 for guiding; optionally, the side walls of the first forming member 31 are gradually expanded outward from the axis, and the side walls of the second forming member 32 are gradually contracted inward from the axis, so as to avoid mutual collision during inward contraction.

In one embodiment, the top ends of the first and second forming

members

31 and 32 are used to abut against the external fixing block 92 to define the position in the vertical direction, and at the same time, to ensure that the first and second forming

members

31 and 32 are horizontally placed. In an embodiment, each of the first and second forming

members

31 and 32 is provided in plurality, and each of the first and second forming

members

31 and 32 is staggered and spliced along the circumference of the mandrel 20 to form a cylinder; the outer sides of the first forming piece 31 and the second forming piece 32 are provided with external threads to form an internal thread product; optionally, a first abutting portion 311 is disposed at the bottom end of the first forming member 31, a second abutting portion 321 is disposed at the bottom end of the second forming member 32, and both the first abutting portion 311 and the second abutting portion 321 are used for abutting the step portion 11. Further, a first limiting part 312 is disposed outside the first molding member 31, a second limiting part 322 is disposed outside the second molding member 32, and the top end of the fixed mold 10 is used for abutting against the first limiting part 312 and the second limiting part 322 to fix the first molding member 31 and the second molding member 32. The first molded member 31 is provided at the inner side thereof with a first slide groove 313 to receive the first rail portion 21, and the second molded member 32 is provided at the inner side thereof with a second slide groove 323 to receive the second rail portion 22.

When the fixed die assembly is used, the fixed die 10 is installed on an injection molding machine, the oil cylinder 91 is installed at one end of the mandrel 20, the equipment is started, and the oil cylinder 91 drives the mandrel 20 to move downwards so as to enable the fixed die assembly 20 and the fixed die 10 to be matched. First, the first abutting portion 311 and the second abutting portion 321 both abut against the step portion 11, and as the mandrel 20 moves down continuously, the first molding member 31 and the second molding member 32 are simultaneously expanded into a cylindrical shape with complete threads, at this time, the top end of the fixed mold 10 abuts against the first limiting portion 312 and the second limiting portion 322, the fixing block 92 descends to press the top portions of the first molding member 31 and the second molding member 32, so as to prevent the first molding member 31 and the second molding member 32 from moving, and at the same time, ensure that the first molding member 31 and the second molding member 32 are horizontally placed, thereby ensuring the processing accuracy.

When the die is required to be opened, the oil cylinder 91 drives the mandrel 20 to move upwards, the positions of the first molding piece 31 and the second molding piece 32 are not changed under the action of the fixed block 92, the first molding piece 31 and the second molding piece 32 are retracted simultaneously until the datum line 23 exceeds the fixed block 92, the fixed block 92 moves upwards again, and the movable die assembly 20 is separated from the fixed die 10 along with the continuous upward movement of the mandrel 20, so that the product can be conveniently demoulded; because the side surface of the mandrel 20 provided with the first guide rail part 21 is 78 degrees with the horizontal plane, and the side surface of the mandrel 20 provided with the second guide rail part 22 is 84 degrees with the horizontal plane, the included angles are different, and the mutual collision between the first forming piece 31 and the second forming piece 32 during retraction is avoided. This mould 100 is used in processing of screw thread product is convenient for the drawing of patterns, promotes product quality.

The mold 100 for processing a threaded product of the present invention forms a cylinder with an external thread by splicing the first forming member 31 and the second forming member 32 along the circumferential direction of the mandrel 20; during injection molding, the mandrel 20 drives the first abutting portion 311 and the second abutting portion 321 to abut against the step portion 11, so that the first molding piece 31 and the second molding piece 32 are simultaneously expanded; when the mold needs to be opened, the mandrel 20 drives the first molding part 31 and the second molding part 32 to contract inwards at the same time, so that the demolding is facilitated, and the product quality is good.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. The die for processing the threaded product is characterized by comprising a fixed die, a mandrel and a movable die assembly, wherein the fixed die is in a hollow cylindrical shape, and a step part is arranged at the bottom end of the fixed die; the cross section of the mandrel is polygonal, and all side surfaces of the mandrel are gradually expanded outwards from the bottom end to the top end; the movable die assembly comprises a first forming piece and a second forming piece, the first forming piece and the second forming piece are arranged along the side surface of the mandrel in a sliding mode, the first forming piece and the second forming piece are multiple, the first forming piece and the second forming piece are spliced in a staggered mode along the circumferential direction of the mandrel to form a cylinder, and external threads are arranged on the outer sides of the first forming piece and the second forming piece to form an internal thread product; the bottom end of the first forming piece is provided with a first abutting part, the bottom end of the second forming piece is provided with a second abutting part, and the first abutting part and the second abutting part are both used for abutting against the step part.

2. The mold for machining the threaded product according to claim 1, wherein a first limiting part is arranged on the outer side of the first molding part, a second limiting part is arranged on the outer side of the second molding part, and the top end of the fixed mold is used for abutting against the first limiting part and the second limiting part.

3. The die for machining the threaded product according to claim 1, wherein a plurality of first rail portions and a plurality of second rail portions are provided on an outer side of the mandrel, a first slide groove is provided on an inner side of the first molding member to accommodate the first rail portions, and a second slide groove is provided on an inner side of the second molding member to accommodate the second rail portions.

4. A die for forming a threaded product according to claim 3, wherein the mandrel is provided with reference lines corresponding to side surfaces of the first guide rail portion.

5. The die for working a threaded product according to claim 3, characterized in that the width of the first guide rail portion is larger than the width of the second guide rail portion.

6. The die for working a threaded product according to claim 3, wherein an inner side surface of the first molding member abuts against a side surface of the mandrel where the first rail portion is provided; the inner side surface of the second forming piece is abutted against the side surface of the mandrel on which the second guide rail part is arranged.

7. The die for machining the threaded product according to claim 3, wherein the mandrel is provided with the first guide rail portion, and the side face of the mandrel, which is provided with the first guide rail portion, forms an included angle with a horizontal plane within a range of 70 degrees to 80 degrees; the side surface of the mandrel, which is provided with the second guide rail part, forms an included angle with the horizontal plane within the range of 80-88 degrees.

8. The die for machining a threaded product according to claim 7, wherein the side of the mandrel on which the first guide rail portion is provided has an angle of 78 degrees with a horizontal plane; the side face of the mandrel, which is provided with the second guide rail part, forms an included angle of 84 degrees with the horizontal plane.

9. The die for machining a threaded product according to claim 1, wherein the top ends of the first and second molding members are configured to abut against an external fixing block.

10. The die for machining a threaded product according to claim 1, characterized in that the side wall of the first molding member abuts against the side wall of the second molding member.