CN214726149U

CN214726149U - Mould screw thread product internal contraction structure

Info

Publication number: CN214726149U
Application number: CN202022909959.0U
Authority: CN
Inventors: 王则锋
Original assignee: Zhuhai Cpt Precision Mold Co ltd
Current assignee: Zhuhai Cpt Precision Mold Co ltd
Priority date: 2020-12-07
Filing date: 2020-12-07
Publication date: 2021-11-16
Anticipated expiration: 2030-12-07

Abstract

The utility model discloses a structure contracts in mould screw thread product, include: the mandrel is gradually retracted from bottom to top, a plurality of first dovetail grooves and a plurality of first dovetail blocks are arranged on the side wall along the circumferential direction, the first dovetail grooves are positioned between every two adjacent first dovetail blocks, and the first dovetail grooves and the first dovetail blocks extend along the retracting direction of the mandrel; the first line positions are respectively and correspondingly arranged on the first dovetail grooves in a sliding mode; the plurality of second line positions correspond to the plurality of first dovetail blocks one by one and are in sliding fit with the first dovetail blocks; the first row positions and the second row positions are alternately spliced along the circumferential direction of the mandrel to form a ring body, and the ring body is provided with an external thread for forming an internal thread product. When this structure implementation drawing of patterns moves, the drawing of patterns action of first line position and second line position is synchronous and stable, and the drawing of patterns in-process, each position that receives on the inboard back-off of product is even, can not appear warping, bad conditions such as dislocation, can improve the drawing of patterns quality of product, improves the production qualification rate of product.

Description

Mould screw thread product internal contraction structure

Technical Field

The utility model relates to a mould processing technology field, in particular to shrink structure in mould screw thread product.

Background

The die is various dies and tools for obtaining required products by injection molding, blow molding, extrusion, die casting or forging forming, smelting, stamping and other methods in industrial production. In short, a mold is a tool used to make a shaped article, the tool being made up of various parts, different molds being made up of different parts. The method realizes the processing of the shape of an article mainly by changing the physical state of a formed material, and enables a blank to be a tool of a workpiece with a specific shape and size under the action of external force. The die has a specific contour or cavity shape, and the blank can be separated (blanked) according to the contour shape by applying the contour shape with the cutting edge. The blank can obtain a corresponding three-dimensional shape by using the shape of the inner cavity. The mold generally comprises a movable mold and a fixed mold (or a male mold and a female mold), which can be separated or combined. When the blank is closed, the blank is injected into the die cavity for forming.

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 most that adopts at present is the rotatory drawing of core drawing of core of spiral, installs a screw thread mold insert in the die cavity of mould usually, and after the product cooling shaping, the rotatory core drawing of screw thread mold insert then breaks away from the mould, and it is ejecting with the product through corresponding thimble structure at last.

For a plastic part with higher precision requirement, the installation of the threaded insert is complicated and time-consuming due to the structural limitation of the demoulding mode, and the inner side structure of the plastic part is easily damaged in the rotary core-pulling process of the threaded insert, so that the plastic part is deformed or the wall thickness is uneven, the produced plastic part after demoulding is difficult to meet the production requirement, and the product qualification rate is reduced.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a structure contracts in mould screw thread product, its structure is ingenious, easy dismounting, and the drawing of patterns action is stable, can improve the drawing of patterns quality of product, improves the production qualification rate of product.

According to the utility model discloses contract structure in mould screw thread product, include: the core shaft is gradually retracted from bottom to top, a plurality of first dovetail grooves and a plurality of first dovetail blocks are arranged on the side wall along the circumferential direction, the first dovetail grooves are located between every two adjacent first dovetail blocks, and the first dovetail grooves and the first dovetail blocks extend along the retraction direction of the core shaft; the first line positions are respectively and correspondingly arranged on the first dovetail grooves in a sliding mode; the plurality of second line positions correspond to the plurality of first dovetail blocks one by one and are in sliding fit with the first dovetail blocks; the first row positions and the second row positions are alternately spliced along the circumferential direction of the mandrel to form a ring body, and the ring body is provided with an external thread for forming an internal thread product.

According to the utility model discloses contract structure in mould screw thread product has following beneficial effect at least:

when this structure implementation drawing of patterns action, the dabber moves along the direction of keeping away from the product, and simultaneously, first line position and second line position slide along first dovetail and the first forked tail piece on the dabber respectively, benefit from first dovetail and first forked tail piece and all be relative the central line slope of dabber, so first line position and second line position when sliding, first line position and second line position still can follow the radial displacement of dabber, realize the action of all first line positions and the simultaneous inside condensation of second line position through above-mentioned action, and then break away from the inboard back-off of product accurately, the drawing of patterns action of first line position and second line position is synchronous and stable, in the drawing of patterns process, the frictional force that each position on the inboard back-off of product received is even, unfavorable conditions such as deformation, dislocation can not appear. In addition, the whole internal shrinkage structure is relatively simple in structure, convenient to disassemble and assemble, stable in demoulding action, and capable of improving the demoulding quality of products and improving the production qualified rate of the products.

According to the utility model discloses a some embodiments, the outer wall of first line position is equipped with first screw thread section, the outer wall of second line position be equipped with first screw thread section concatenation complex second screw thread section, the external screw thread is by a plurality of first screw thread section and a plurality of second screw thread section forms along circumference concatenation in turn.

According to some embodiments of the utility model, be equipped with on the inner wall of first line position with first dovetail sliding fit's second dovetail block, be equipped with on the inner wall of second line position with first dovetail block complex second dovetail.

According to the utility model discloses a some embodiments still include the base plate, the base plate cover is established the bottom of dabber, first line position with second line position all can be fixed on the base plate, the inner wall shape of base plate with the outer wall shape phase-match of dabber.

According to some embodiments of the utility model, the bottom lateral wall of first line position with the bottom lateral wall of second line position all is equipped with the mount pad to the evagination, mount pad accessible fix with screw on the base plate, the mount pad still can be followed the base plate slides.

According to the utility model discloses a some embodiments, the bottom of base plate still is provided with the limiting plate, the limiting plate can respectively through the screw with the dabber with the base plate is connected.

According to some embodiments of the utility model, still including being used for the location the cylinder piece of dabber, the upper end of cylinder piece with the bottom of dabber is connected.

According to some embodiments of the utility model, the lateral wall of dabber is equipped with a plurality of location thread holes along circumference, the lateral wall of first line position be equipped with location thread hole corresponds the first thread hole of complex, the lateral wall of second line position also be equipped with location thread hole corresponds the second thread hole of complex.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic structural diagram of an embodiment of the present invention;

fig. 2 is another schematic structural diagram of the embodiment of the present invention;

fig. 3 is an exploded view of an embodiment of the present invention;

fig. 4 is a schematic structural view of the embodiment of the present invention after the mandrel is drawn out a distance downwards.

Wherein: the spindle comprises a spindle 100, a first dovetail groove 110, a first dovetail block 120, a positioning screw hole 130, a first line position 200, a first thread section 210, a second dovetail block 220, a first screw hole 230, a second line position 300, a second thread section 310, a second dovetail groove 320, a second screw hole 330, a base plate 400, a mounting seat 500, a limiting plate 600, an external thread 700 and a cylindrical block 800.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated with respect to the orientation description, such as up, down, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of 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 thus, should not be construed as limiting the present invention.

In the description of the present invention, a plurality of means are one or more, a plurality of means are two or more, and the terms greater than, less than, exceeding, etc. are understood as not including the present number, and the terms greater than, less than, within, etc. are understood as including the present number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present invention, unless there is an explicit limitation, the words such as setting, installation, connection, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in combination with the specific contents of the technical solution.

Referring to fig. 1, 2, 3 and 4, the present invention discloses a mold thread product retraction structure, which comprises a mandrel 100, a plurality of first rows 200 and a plurality of second rows 300.

The mandrel 100 is gradually retracted from bottom to top, that is, the outer diameter of the mandrel 100 is gradually reduced from bottom to top, the side wall of the mandrel 100 is provided with a plurality of first dovetail grooves 110 and a plurality of first dovetail blocks 120 along the circumferential direction, the first dovetail grooves 110 are located between two adjacent first dovetail blocks 120, and the first dovetail grooves 110 and the first dovetail blocks 120 both extend along the retracting direction of the mandrel 100.

The plurality of first rows 200 are respectively and correspondingly slidably mounted on the first dovetail grooves 110, the plurality of second rows 300 are in one-to-one correspondence with the plurality of first dovetail blocks 120 and are in sliding fit with the first dovetail blocks, and the plurality of first rows 200 and the plurality of second rows 300 are alternately spliced along the circumferential direction of the mandrel 100 to form a circular ring body which is provided with external threads 700 for forming an internal thread product.

It should be understood that the first dovetail slot 110 and the first dovetail block 120 are both angled with respect to the centerline of the spindle 100, and that the first row 200 and the second row 300 are also angled with respect to the centerline of the spindle 100 due to the sliding engagement of the first row 200 and the second row 300 with the first dovetail slot 110 and the first dovetail block 120, respectively.

In addition, it should be understood that, after all the first row positions 200 and the second row positions 300 are alternately spliced along the circumferential direction of the mandrel 100 to form a torus, the outer wall of the torus forms a complete external thread 700, the internal thread of the product is formed by injection molding of the external thread 700 of the torus, and the inner side buckling position of the product is the internal thread of the product.

It should be understood that, when the retracting structure performs the releasing action, the mandrel 100 is driven by a corresponding power device (e.g., a machine tool, a hydraulic press, etc.) to move in a direction away from the product, and at the same time, the first row 200 and the second row 300 respectively slide along the first dovetail groove 110 and the first dovetail block 120 on the mandrel 100, and due to the fact that the first dovetail groove 110 and the first dovetail block 120 are both inclined with respect to the central line of the mandrel 100, while the first row 200 and the second row 300 slide, the first row 200 and the second row 300 also move in the radial direction of the mandrel 100, and all the actions of the first row 200 and the second row 300 simultaneously retracting inward are realized through the actions, so as to accurately disengage from the inside undercut of the product.

In the whole process, the demoulding action of the first line position 200 and the second line position 300 is synchronous and stable, and in the demoulding process, the friction force received by each position on the inner side reverse buckle of the product is uniform, so that the adverse conditions of deformation, dislocation and the like can not occur, and the structural stability of the product is ensured.

In addition, the whole internal shrinkage structure is relatively simple in structure, convenient to disassemble and assemble, stable in demoulding action, and capable of improving the demoulding quality of products and improving the production qualified rate of the products.

In some embodiments of the present invention, referring to fig. 1 and 3 again, the outer wall of the first row 200 is provided with a first thread segment 210, the outer wall of the second row 300 is provided with a second thread segment 310 spliced with the first thread segment 210, and the external thread 700 is formed by alternately splicing the plurality of first thread segments 210 and the plurality of second thread segments 310 along the circumferential direction.

It is easily understood that, in the present embodiment, after all the first row positions 200 and the second row positions 300 are slidably mounted on the corresponding positions of the mandrel 100, the first row positions 200 and the second row positions 300 form a complete torus, and the upper circumferential surface of the torus is the complete external thread 700 formed by alternately splicing all the first thread segments 210 and the second thread segments 310, so that the installation and the disassembly are convenient.

In some embodiments of the present invention, referring to fig. 3 again, in order to further facilitate the cooperation of the first slide 200 and the second slide 300 with the mandrel 100, the second dovetail block 220 in sliding fit with the first dovetail groove 110 is disposed on the inner wall of the first slide 200, the second dovetail groove 320 in sliding fit with the first dovetail block 120 is disposed on the inner wall of the second slide 300, the sliding fit between the first dovetail groove 110 and the second dovetail block 220 and the sliding fit between the second dovetail groove 320 and the first dovetail block 120 well limit the first slide 200 and the second slide 300, so that the first slide 200 and the second slide 300 stably slide along a straight line, the first slide 200 and the second slide 300 are prevented from sliding or shifting to both sides, and the demolding quality of the product is further improved.

In some embodiments of the utility model, join fig. 2 and fig. 3 again, in order to make things convenient for shift this structure whole to the die cavity of mould, this structure of contracting still includes base plate 400, base plate 400 cover is established in the bottom of dabber 100, first capable position 200 and second capable position 300 all can be fixed on base plate 400, the inner wall shape of base plate 400 and the outer wall shape phase-match of dabber 100, it is concrete, the bottom lateral wall of first capable position 200 and the bottom lateral wall of second capable position 300 all are equipped with mount pad 500 to the evagination, mount pad 500 accessible fix with screw is on base plate 400, mount pad 500 still can follow base plate 400 and slide.

In addition, the sidewall of the mandrel 100 is circumferentially provided with a plurality of positioning screw holes 130, the sidewall of the first row 200 is provided with a first screw hole 230 correspondingly matched with the positioning screw holes 130, and the sidewall of the second row 300 is also provided with a second screw hole 330 correspondingly matched with the positioning screw holes 130.

It should be understood that, in the present embodiment, the mounting seat 500 is block-shaped, the mounting seat 500 on the first row 200 and the first row 200 are integrally formed, and the mounting seat 500 on the second row 300 and the second row 300 are also integrally formed.

Before the structure is installed on a mold, the first line 200 and the second line 300 exist as independent parts, an operator can firstly assemble all the first line 200 and the second line 300 on corresponding positions of the mandrel 100, the positioning screw hole 130 is fixedly connected with the first screw hole 230 and the second screw hole 330 through screws respectively, so that the first line 200 and the second line 300 are tightly attached and fixed on the mandrel 100, the first line 200 and the second line 300 are prevented from shifting, then the substrate 400 is sleeved on the bottom of the mandrel 100, the installation seats 500 on the first line 200 and the second line 300 are fixed on the substrate 400 through screws, the inner peripheral wall of the substrate 400 is slidably attached with the outer peripheral wall of the mandrel 100, therefore, the mandrel 100, the first line 200, the second line 300 and the substrate 400 form an integral piece, the operator can integrally transfer and place the integral piece on the corresponding positions of the mold, the base plate 400 is stably positioned at a preset position in the die, and then the connecting screws between the first slide 200 and the mandrel 100, the connecting screws between the second slide 300 and the mandrel 100, and the connecting screws between the mounting base 500 and the base plate 400 are sequentially screwed and taken out, so that the sliding freedom degree of the first slide 200 and the second slide 300 is ensured while the mounting precision of the whole retraction structure is ensured.

The installation mode can avoid that each independent part forming the retraction structure is respectively installed on the die, and the integral structure is installed at the corresponding position of the die instead of the independent part, and then the corresponding connecting screw is disassembled, so that the installation efficiency and the installation precision of the retraction structure are improved.

In addition, in this embodiment, the substrate 400 is disposed to perform positioning and mounting functions, and meanwhile, when all the first row 200 and the second row 300 are retracted in the radial direction, the mounting seat 500 at the bottom of the first row 200 and the mounting seat 500 at the bottom of the second row 300 both slide along the surface of the substrate 400, that is, the substrate 400 further provides a supporting and sliding platform for the first row 200 and the second row 300, so as to prevent the first row 200 and the second row 300 from sliding downward, prevent the first row 200 and the second row 300 from moving upward and downward, ensure that the first row 200 and the second row 300 only slide in the radial direction and retract away from the catching position inside the product, and further improve the demolding precision of the product.

Furthermore, in some embodiments of the utility model, referring back to fig. 3, the bottom of base plate 400 still is provided with limiting plate 600, and limiting plate 600 can be connected with dabber 100 and base plate 400 through the screw respectively, and when this structure of contracting in before the mould, operating personnel still can set firmly a limiting plate 600 through the screw in the bottom of base plate 400 to strengthen the stability of base plate 400, prevent the skew of base plate 400, simultaneously, when the cavity overlength of this structure of contracting in the installation in the mould or when too dark, limiting plate 600 has still played the effect of bed hedgehopping.

In addition, in some embodiments of the present invention, referring to fig. 2 and 4 again, in order to facilitate the downward movement and extraction of the mandrel 100, the present invention further includes a cylindrical block 800 for positioning the mandrel 100, the upper end of the cylindrical block 800 is connected to the bottom of the mandrel 100, when the present retraction structure implements the mold release action, a corresponding power device (such as a machine tool, a hydraulic press, etc.) can clamp the cylindrical block 800 and then drive the mandrel 100 to move downward, thereby implementing the mold release action of the entire retraction structure.

It should be understood that, in this embodiment, the bottom end of the mandrel 100 may be connected to the cylindrical block 800 through a screw, the outer diameter of the cylindrical block 800 is smaller than the outer diameter of the mandrel 100, so as to facilitate clamping of corresponding power equipment, the arrangement of the cylindrical block 800 avoids the direct contact between the mandrel 100 and the power equipment, avoids the rigid damage to the mandrel 100, and improves the recycling rate of the mandrel 100.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.

Claims

1. A mold thread product retraction structure, comprising:

the core shaft is gradually retracted from bottom to top, a plurality of first dovetail grooves and a plurality of first dovetail blocks are arranged on the side wall along the circumferential direction, the first dovetail grooves are located between every two adjacent first dovetail blocks, and the first dovetail grooves and the first dovetail blocks extend along the retraction direction of the core shaft;

the first line positions are respectively and correspondingly arranged on the first dovetail grooves in a sliding mode;

the plurality of second line positions correspond to the plurality of first dovetail blocks one by one and are in sliding fit with the first dovetail blocks;

the first row positions and the second row positions are alternately spliced along the circumferential direction of the mandrel to form a ring body, and the ring body is provided with an external thread for forming an internal thread product.

2. The retraction structure for threaded mold products as claimed in claim 1, wherein said first row of outer walls is provided with a first thread segment, said second row of outer walls is provided with a second thread segment matching said first thread segment, and said external thread is formed by alternately splicing a plurality of said first thread segments and a plurality of said second thread segments along the circumferential direction.

3. The retraction structure for threaded products of dies according to claim 1, wherein the inner wall of the first row is provided with a second dovetail block which is in sliding fit with the first dovetail groove, and the inner wall of the second row is provided with a second dovetail groove which is in fit with the first dovetail block.

4. The structure of claim 1, further comprising a base plate, wherein the base plate is sleeved on the bottom of the mandrel, the first row and the second row are both fixed on the base plate, and the shape of the inner wall of the base plate matches the shape of the outer wall of the mandrel.

5. The structure of claim 4, wherein the bottom side wall of the first row and the bottom side wall of the second row are both provided with mounting seats protruding outwards, the mounting seats can be fixed on the base plate through screws, and the mounting seats can also slide along the base plate.

6. The mold threaded product retraction structure according to claim 4, wherein a bottom of the base plate is further provided with a limiting plate, and the limiting plate can be respectively connected with the mandrel and the base plate through screws.

7. The die thread product draw-in structure of claim 1, further comprising a cylindrical block for positioning said mandrel, wherein an upper end of said cylindrical block is connected to a bottom of said mandrel.

8. The structure of claim 1, wherein the sidewall of the mandrel has a plurality of positioning screw holes along a circumferential direction, the sidewall of the first row has a first screw hole corresponding to the positioning screw hole, and the sidewall of the second row has a second screw hole corresponding to the positioning screw hole.