CN111002533B

CN111002533B - Method for ensuring consistency of thread starting point of product with positioning thread

Info

Publication number: CN111002533B
Application number: CN201911233104.6A
Authority: CN
Inventors: 张劲松; 刘宝升; 王元挺; 赖久乐; 于忠灿; 郭勇
Original assignee: Ningbo Tianlong Electronics Co ltd
Current assignee: Ningbo Tianlong Electronics Co ltd
Priority date: 2019-12-05
Filing date: 2019-12-05
Publication date: 2021-10-01
Anticipated expiration: 2039-12-05
Also published as: CN111002533A

Abstract

The invention discloses a method for ensuring consistency of thread starting points of a product with positioning threads, which is characterized in that a vertical mark is processed on the outer peripheral wall of the upper part of a thread forming sleeve to be used as an angle processing reference of a thread structure in the circumferential direction, the processing position of the starting point of the thread structure required by the product with the positioning threads is determined according to the processing reference, and then the thread structure required by the product with the positioning threads is processed on the inner peripheral wall of the lower part of the thread forming sleeve; processing a first radial mark on the upper end surface of the gear along the radial direction, and aligning the first radial mark with the position of the vertical mark after the gear is in linkage fit with the thread forming sleeve; processing a second radial mark on the upper end surface of the fixed die base plate; during assembly, the vertical mark, the first radial mark and the second radial mark are aligned in a straight line in the radial direction to form a thread-removing positioning reference in a thread-removing die closing state; the method has the advantage that the thread structure on the batch injection-molded product with the positioning threads can be ensured to be uniformly distributed along the circumferential direction.

Description

Method for ensuring consistency of thread starting point of product with positioning thread

Technical Field

The invention relates to a thread product manufacturing technology, in particular to a method for ensuring consistency of thread starting points of a product with positioning threads.

Background

At present, the situation that threads in the circumferential direction are distributed differently easily occurs to a plurality of thread products injection molded by using a thread removing mold, namely, the plurality of manufactured thread products may be different. Although in many use occasions, the distribution of the threads of the threaded product in the circumferential direction is not required, and only the function of screwing is required, at present, more and more use occasions have strict requirements on the distribution of the threads of the threaded product in the circumferential direction, so that the threaded product manufactured by using the existing thread removing die cannot meet the use requirements.

The circular thread product with positioning, which is shown in fig. 1a to fig. 1g and has a diameter of 65.1mm, is made of PA6 material, the upper end of the product is a thread structure with 3 threads, and the starting positions of the 3 threads are respectively located at B, C, D, that is, the 3 threads have position requirements in the circumferential direction. The size 6.8mm of the B starting point in fig. 1a corresponds to the angular position of the B starting point in fig. 1D, the size 6.5mm of the C starting point in fig. 1B corresponds to the angular position of the C starting point in fig. 1D, and the size 18.2mm of the D starting point in fig. 1C corresponds to the angular position of the D starting point in fig. 1D. After injection molding of the product with the positioning circular thread, the product needs to axially move 4mm in a cavity which is rotationally separated from the thread removing mold, as shown in fig. 1 e. When such a circular threaded product with positioning is manufactured in batch by using an existing single-die single-cavity unscrewing die or an existing single-die multi-cavity unscrewing die, it is not possible to ensure that the thread starting point positions of the thread structures at the upper ends of a plurality of manufactured circular threaded products with positioning are consistent, and therefore, it is necessary to develop a technology capable of ensuring the consistency of the thread starting point positions of a plurality of products with positioning, which are manufactured by using the unscrewing die.

Disclosure of Invention

The invention aims to provide a method for ensuring the consistency of starting points of threads of a product with positioning threads, which can ensure the consistency of the distribution of threads of a thread structure on the product with positioning threads formed by injection molding of a thread removing mold along the circumferential direction.

The technical scheme adopted by the invention for solving the technical problems is as follows: a method of ensuring consistency of thread starting points for a positioned threaded product, comprising the steps of:

step 1: processing an axial vertical mark on the outer peripheral wall of the upper part of a thread forming sleeve in a thread removing mould; then, the vertical mark is used as an angle processing reference of the thread structure in the circumferential direction, the processing position of the starting point of the thread structure required by the thread product with the positioning function is determined according to the processing reference, and the thread structure required by the thread product with the positioning function is processed on the inner peripheral wall of the lower part of the thread forming sleeve; and a thread structure matched with the thread sleeve in the thread removing mould is processed on the outer peripheral wall of the upper part of the thread forming sleeve;

step 2: processing a first radial mark on the upper end surface of a gear in the thread removing die along the radial direction, and aligning the position of the first radial mark with the position of a vertical mark after the gear is in linkage fit with the thread forming sleeve;

and step 3: processing a second radial mark on the upper end surface of a fixed die base plate in the thread removing die;

and 4, step 4: when the thread removing die is assembled, the vertical mark, the first radial mark and the second radial mark are aligned in a straight line in the radial direction to form a thread removing positioning reference in a matched die state of the thread removing die;

and 5: when the thread removing mold works, the rack in the thread removing mold moves linearly, the rack drives the gear meshed with the rack to rotate, the gear drives the thread forming sleeve in linkage fit with the gear to rotate, and under the action of the thread sleeve in threaded fit with the thread forming sleeve, the thread forming sleeve completes axial displacement, and the demolding action of the thread product with positioning to separate from the thread forming sleeve is completed.

In the step 1, the vertical mark is a vertical groove, the width of the vertical groove is 3mm, the height of the vertical groove is 12.5mm, and the depth of the vertical groove is 0.5 mm.

In the step 2, the first radial mark is a radial groove, and the width of the radial groove is 3mm and the depth of the radial groove is 0.5 mm.

In the step 2, the radial groove is located on one tooth of the gear.

In the step 2, the linkage matching structure between the gear and the thread forming sleeve is a key and key groove matching structure, key grooves are symmetrically arranged on two sides of the radial groove on the circumferential wall of the inner ring of the gear, and keys are symmetrically arranged on two sides of the vertical groove on the circumferential wall of the thread forming sleeve.

In the step 3, the second radial mark is an indication arrow, the length of the indication arrow is 10mm, the depth of the indication arrow is 0.5mm, and the indication arrow points to the direction of the gear.

In the step 3, if one rack is meshed with two gears in the thread removing die, an indicating arrow is processed on the upper end surface of the fixed die base plate corresponding to one gear, a connecting line of the two indicating arrows along the length direction of the indicating arrows is parallel to the movement direction of the rack, and the positions of the two indicating arrows are different by 180 degrees.

Compared with the prior art, the invention has the advantages that:

the method comprises the steps of firstly processing a vertical mark used as an angle processing reference of a thread structure in the circumferential direction on the peripheral wall of a thread forming sleeve, then processing a first radial mark on the upper end surface of a gear in the radial direction, and then processing a second radial mark on the upper end surface of a fixed die base plate, wherein the positions of the vertical mark, the first radial mark and the second radial mark are aligned to form a straight line in the radial direction during assembly, so that a thread-removing positioning reference in a thread-removing die closing state is formed, and the thread structure on a thread-removing die batch injection molding product with positioning threads of one die or a plurality of dies in the circumferential direction can be ensured to be uniformly distributed.

Drawings

FIG. 1a is a front view of a round thread product having 3 start threads;

FIG. 1b is a right side view of FIG. 1 a;

FIG. 1c is a left side view of FIG. 1 a;

FIG. 1d is a top view of FIG. 1 a;

FIG. 1e is a sectional view taken along line A-A of FIG. 1 a;

FIG. 1f is a schematic perspective view of a round thread product with 3 threads;

FIG. 1g is a schematic perspective view of a round thread product having 3 start threads;

FIG. 2 is a top view of the stationary die side of a one-die two-cavity unthreading die;

FIG. 3 is a top view of the moving die side of a one die two cavity unthreading die;

FIG. 4 is a cross-sectional view taken along line E-E of FIG. 2;

FIG. 5 is an enlarged schematic view of a portion of the structure of FIG. 4;

FIG. 6 is a schematic perspective view of a thread forming sleeve in the die side of a two cavity stripping die;

FIG. 7 is a front view of the thread forming sleeve in the die side of a one die two cavity unthreading die;

FIG. 8 is a sectional view taken along line G-G of FIG. 7;

FIG. 9 is a bottom view of FIG. 7;

FIG. 10 is a top view of FIG. 7;

FIG. 11 is a top view of a gear in the stationary die side of a one-die two-cavity unthreading die;

FIG. 12 is a top view of the stationary die backing plate in the stationary side of a two cavity stripping die;

FIG. 13 is an enlarged view of portion H of FIG. 12;

FIG. 14 is a cross-sectional view taken along line W-W of FIG. 5;

FIG. 15 is an enlarged view of portion X of FIG. 14;

FIG. 16 is a sectional view taken along line I-I of FIG. 5;

FIG. 17 is an enlarged view of portion J of FIG. 16;

FIG. 18 is an enlarged view of portion K of FIG. 16;

FIG. 19 is a corresponding isometric view of FIG. 16;

FIG. 20 is an enlarged view of portion L of FIG. 19;

FIG. 21 is a schematic view of a two cavity stripping die with the rack in the stationary side of the die withdrawn outward to complete stripping;

FIG. 22 is an enlarged view of portion M of FIG. 21;

fig. 23 is a partial cross-sectional view corresponding to fig. 5 after complete unthreading after outward extraction of the racks in the set side of a two cavity unthreading die.

Detailed Description

The invention is described in further detail below with reference to the accompanying examples.

Fig. 2 to 5 show structural schematic diagrams of a one-die two-cavity thread removing die, in which 1 represents an injection-molded thread product, 2 represents a fixed die core in the thread removing die, 3 represents a fixed die plate in the thread removing die, 4 represents a thread forming sleeve in the thread removing die, 5 represents a fixed die pad in the thread removing die, 6 represents a gear in the thread removing die, 7 represents a key in the thread removing die, 8 represents a pressing block in the thread removing die, 9 represents a fixed die fixing plate in the thread removing die, 10 represents a fixed die insert in the thread removing die, 11 represents a thread sleeve in the thread removing die, 12 represents a thread sleeve pressing plate in the thread removing die, 13 represents an upper rack pad in the thread removing die, 14 represents a rack in the thread removing die, and 15 represents a lower rack pad in the thread removing die.

The invention provides a method for ensuring consistency of thread starting points of a product with positioning threads, which comprises the following steps:

step 1: as shown in fig. 6, 7 and 8, an axial vertical mark, i.e., a vertical groove 41, is formed on the upper peripheral wall of the thread forming sleeve 4 in the thread removing mold; then, the vertical groove 41 is used as an angle processing reference of the thread structure in the circumferential direction, the processing position of the starting point of the thread structure required by the positioning thread product is determined according to the processing reference, and then the thread structure 42 required by the positioning thread product 1 is processed on the inner peripheral wall of the lower part of the thread forming sleeve 4; and a thread structure 43 matched with the thread sleeve 11 in the thread forming sleeve 4 is processed on the upper peripheral wall of the thread forming sleeve 4, the upper end of the vertical groove 41 is close to the thread structure 43 processed on the upper peripheral wall of the thread forming sleeve 4, when the thread structure 43 matched with the thread sleeve 11 is processed, the requirement on the thread structure 43 is not high, so that the processing position of the starting point of the thread structure 43 does not need to be determined according to the processing standard and then is processed, and the processing position of the starting point of the thread structure 43 can be determined according to the processing standard and then is processed.

In the present embodiment, in step 1, the vertical groove 41 has a width of 3mm, a height of 12.5mm, and a depth of 0.5 mm. The specific value is a set of data determined according to actual conditions.

It is particularly noted that the vertical groove 41 must be machined, the vertical groove 41 is used as an angle machining reference of the thread structure in the circumferential direction, and the thread structure 42 required by the positioning thread product 1 is machined, if not, the position of the vertical groove 41 cannot be pushed back by the position of the machined thread structure because the thread structure 42 required by the positioning thread product 1 does not take the angle size of the thread starting point into consideration, and the thread structure 42 on the injection-molded positioning thread product 1 cannot necessarily meet the required angle requirement, namely, the injection-molded positioning thread product 1 is useless.

Fig. 9 is a schematic diagram showing the positions of the starting points of the 3-start threads of the thread structure required for positioning the circular thread product shown in fig. 1a to 1g on the lower inner peripheral wall of the thread forming sleeve when the vertical groove shown in fig. 6 is used as the angular processing reference of the thread structure in the circumferential direction, and 120 degrees indicated by S in fig. 9 are used as the angular dimensions of the starting points of the threads. Fig. 10 is a schematic diagram showing a position of a starting point of a thread structure to be processed to be engaged with the thread bush in the thread removing mold on the upper outer circumferential wall of the thread forming bush when the vertical groove shown in fig. 6 is used as an angle processing reference in the circumferential direction of the thread structure, 120 degrees indicated by T in fig. 10 are used as an angle size of the starting point of the thread, and 3 120 degrees in fig. 10 correspond to 3 threads to be processed on the lower inner circumferential wall of the thread forming bush.

Step 2: as shown in fig. 11, a first radial mark, i.e., a radial groove 61, is radially formed on the upper end surface of the gear 6 in the thread removing mold, and the radial groove 61 is aligned with the vertical groove 41 after the gear 6 is interlocked with the thread forming sleeve 4.

In the present embodiment, in step 2, the radial groove 61 has a width of 3mm and a depth of 0.5 mm. The specific value is a set of data determined according to actual conditions.

In the present embodiment, in step 2, the radial groove 61 is located on one tooth 62 of the gear 6, the linkage matching structure between the gear 6 and the thread forming sleeve 4 is a key and key groove matching structure, key grooves 63 are symmetrically arranged on two sides of the radial groove 61 on the inner circumferential wall of the gear 6, and keys 7 are symmetrically arranged on two sides of the vertical groove 41 on the outer circumferential wall of the thread forming sleeve 4, as shown in fig. 11.

And step 3: as shown in fig. 12 and 13, a second radial mark, i.e., an indication arrow 51, is processed on the upper end surface of the fixed die shim plate 5 in the thread removing die, and the indication arrow 51 is directed to the gear 6.

In this embodiment, in step 3, the length of the indication arrow 51 is 10mm and the depth is 0.5 mm. The specific value is a set of data determined according to actual conditions.

In the embodiment, in step 3, if one rack 14 engages two gears 6 in the thread removing mold, an indication arrow 51 is processed on the upper end surface of the fixed mold backing plate 5 corresponding to one gear 6, a connecting line of the two indication arrows 51 along the length direction thereof is parallel to the movement direction of the rack 14, and the positions of the two indication arrows 51 are different by 180 degrees. Fig. 12 shows the fixed die base plate of the two-cavity screw-stripping die, and as can be seen from fig. 12, the connecting line of the two indicating arrows along the length direction is parallel to the moving direction of the rack, and the positions of the two indicating arrows are 180 degrees different.

And 4, step 4: as shown in fig. 14 and 15, an indication pattern 111 is engraved on the thread bush 11 in the thread stripping mold, and a specific value of the axial movement distance required for stripping (4 mm as indicated in fig. 15) is indicated on the indication pattern 111; as shown in fig. 16 to 20, when the thread removing mold is assembled, the positions of the vertical groove 41, the radial groove 61, and the indication arrow 51 are aligned in a straight line in the radial direction, and a thread removing positioning reference in a clamped state of the thread removing mold is configured.

The positioned circular threaded product shown in fig. 1a to 1g needs to be axially moved by 4mm in a cavity of a rotary stripping die, namely, the axial movement distance required for stripping is 4mm, as shown in fig. 5.

Fig. 17 shows an enlarged view of a portion J in fig. 16, fig. 18 shows an enlarged view of a portion K in fig. 16, and it can be seen from fig. 17 and fig. 18 that before the operation of the thread stripping die, the vertical grooves 41, the radial grooves 61 and the position alignment of the indication arrow 51 are aligned in a straight line in the radial direction, so that the position distribution of the thread structures on the positioned thread product 1 injected from one die and two cavities in the circumferential direction is consistent when the thread stripping die operates.

And 5: when the thread removing mold works, as shown in fig. 21 and 22, under the driving of an oil cylinder 16 in the thread removing mold, a rack 14 is driven to do linear motion through an oil cylinder connecting block 17, the rack 14 drives a gear 6 meshed with the rack to rotate, the gear 6 drives a thread forming sleeve 4 matched with the gear through a key 7 and a key groove 63 to rotate, under the action of a thread sleeve 11 in threaded connection and matching with the thread forming sleeve 4, the thread forming sleeve 4 completes axial displacement, and the demolding action of the thread product 1 from the thread forming sleeve 4 is completed; wherein, the distance of the axial displacement is the axial moving distance required by thread stripping.

The rack 14 in fig. 21 is drawn out in the direction of the arrow marked on the rack 14, the gear 6 drives the thread forming sleeve 4 to rotate, and the gear 6 rotates 153 degrees after thread removing is completed, as shown in fig. 22; the gear 6 of the same other cavity drives the thread forming sleeve 4 to rotate 153 degrees. Because the thread bush 11 is axially fixed between the fixed die fixing plate and the fixed die backing plate 5, and the thread forming bush 4 is in threaded connection with the thread bush 11, after the thread forming bush 4 rotates 153 degrees, the axial moving distance required by the thread forming bush 4 to move axially to remove threads, namely, the axial moving distance moves upwards by 4mm, as shown in fig. 23.

When the method is applied, the sequence of the step 2 and the step 3 is not divided into sequence.

Claims

1. A method of ensuring consistency of thread starting points for a positioned threaded product, comprising the steps of:

and 4, step 4: when the thread removing die is assembled, the vertical mark, the first radial mark and the second radial mark are aligned to form a thread removing positioning reference in a matched die state of the thread removing die;

2. The method of ensuring consistency of thread starting points of a positioned threaded product of claim 1, wherein in step 1 the vertical mark is a vertical groove having a width of 3mm, a height of 12.5mm and a depth of 0.5 mm.

3. A method for ensuring consistency of a thread start point of a positioned threaded product according to claim 2, wherein in step 2 the first radial mark is a radial groove having a width of 3mm and a depth of 0.5 mm.

4. A method for ensuring consistency in the thread start of a positioned threaded product according to claim 3 wherein in step 2 the radial groove is located on a tooth of the gear.

5. The method for ensuring the consistency of the starting points of the threads of the positioned threaded products according to claim 4, wherein in the step 2, the linkage matching structure between the gear and the thread forming sleeve is a key-key groove matching structure, the key grooves are symmetrically arranged on the two sides of the radial groove on the inner circumferential wall of the gear, and the keys are symmetrically arranged on the two sides of the vertical groove on the outer circumferential wall of the thread forming sleeve.

6. A method for ensuring consistency of start points of threads of a positioned threaded product according to claim 3 or 4, wherein in step 3 the second radial mark is an indicator arrow having a length of 10mm and a depth of 0.5mm, the indicator arrow pointing in the direction of the gear.

7. The method for ensuring the consistency of the thread starting points of the positioned threaded products according to claim 6, wherein in the step 3, if one rack is meshed with two gears in the thread stripping die, an indicating arrow is processed on the upper end surface of the fixed die base plate corresponding to one gear, the connecting line of the two indicating arrows along the length direction is parallel to the moving direction of the rack, and the positions of the two indicating arrows are different by 180 degrees.