CN214645440U - Positioning needle and injection mold comprising same - Google Patents

Abstract

The utility model provides a pilot pin and an injection mold including this pilot pin. The pilot pin includes: a positioning pin base located at a first end of the positioning pin; a positioning pin extension extending from the positioning pin base to the second end in an axial direction from the first end toward a second end opposite the first end, the positioning pin extension having a hole and a slot extending from the second end toward the first end, the slot penetrating the positioning pin extension in a radial direction of the positioning pin extension. The positioning pin has larger elasticity and flexibility and deflection deformation capacity compared with the traditional solid positioning pin, and an injection mold comprising the positioning pin can ensure that the insert is kept fixed in position relative to the mold in the injection molding process and simultaneously avoid the insert from being cracked in the insert mounting operation and the like.

Description

Positioning needle and injection mold comprising same

Technical Field

The present application relates to the field of injection molding, and in particular, to a locating pin for locating an insert in an injection mold in insert molding and an injection mold including the same.

Background

Injection molding is a widely used industrial product production molding method, and has the advantages of short molding period, high production efficiency and the like. When the desired injection molded product contains a foreign material, it is necessary to insert a previously prepared foreign material insert into the injection mold to obtain an integrated product through an injection molding process, which is called insert molding. For example, when testing the adhesion between a high molecular material, such as a transparent nylon material or a glass fiber reinforced nylon material, and glass, it is necessary to insert a glass insert into an injection mold and then inject the nylon material, so that the nylon material and the insert are combined and cured during the injection molding process, thereby obtaining an integrated product for the adhesion test.

In order to keep the insert in the mold and accurately position it during the injection molding process, locating holes are typically provided in the insert and locating pins extending through the locating holes in the insert are used to secure the insert in position relative to the mold. However, since the roundness, the hole diameter, the hole pitch, and the like of the positioning holes on the insert inevitably have slight deviations during the machining, the insert will have a risk of chipping during the mounting of the insert or the closing of the mold. In particular, when the insert is a brittle material such as a glass insert which is easily broken, the insert is more likely to be broken or damaged, thereby reducing the yield of injection molding.

It should be noted that this background section is intended to illustrate the technical background of the application and is not intended to limit the scope of the application. It should also be noted that the technical content provided in this section is intended to assist the understanding of the present invention by a person skilled in the art, and does not necessarily constitute prior art.

SUMMERY OF THE UTILITY MODEL

The general outline of the present invention is provided in this section, not a full scope of the invention or a full disclosure of all the features of the invention.

The purpose of this disclosure is to provide a novel pilot pin that has the ability of elasticity and flexural deformation to compensate for dimensional deviations caused during part machining, thereby avoiding the insert from fracturing during installation.

It is another object of the present disclosure to provide a novel injection mold that avoids cracking of the insert during insert installation and the like while ensuring that the insert remains fixed in place relative to the mold during injection molding.

According to an aspect of the present disclosure, there is provided a positioning pin, wherein the positioning pin includes: a positioning pin base located at a first end of the positioning pin; a positioning pin extension extending from the positioning pin base to a second end opposite the first end along an axial direction from the first end toward the second end, the positioning pin extension having a hole and a slot extending from the second end toward the first end, the slot penetrating the positioning pin extension in a radial direction of the positioning pin extension.

In the above-described positioning pin, the hole is located at the center of the positioning pin extension and the groove is provided symmetrically with respect to the center.

In the above-described positioning pin, the positioning pin extension has a chamfered portion at the second end portion, the chamfered portion being configured to taper inwardly in the radial direction at a tip.

In the above-described pilot pin, the hole is a through-hole penetrating the pilot pin base and the pilot pin extension in the axial direction.

In the above-described positioning pin, the groove extends in the axial direction to a depth exceeding 1/2 of the length of the positioning pin extension in the axial direction.

In the above-described positioning pin, an outer diameter of the positioning pin base is larger than an outer diameter of the positioning pin extension.

According to another aspect of the present disclosure, there is provided an injection mold, wherein the injection mold comprises: the template is provided with a positioning hole penetrating through the template; the die core is arranged in the template and used for receiving the insert and the injection molding material, and the die core is also penetrated through by the positioning hole; and two positioning pins as described above, the positioning pin extension parts of the positioning pins being inserted into the injection mold through the positioning holes.

In the above injection mold, the pilot pin extensions of the pilot pins have different outer diameters.

In the above injection mold, the positioning pin is positioned so as to be located on a center line of the insert when the insert is received in the cavity.

In the above injection mold, the positioning pins are positioned so as to be located on a diagonal line of the insert when the insert is received in the cavity.

In one embodiment of the present disclosure, the positioning pin extension of the positioning pin is configured with a hole and a groove extending in the axial direction. By virtue of this design, the locating pin will have sufficient resilience and flexural deformability to compensate for dimensional variations caused during part machining, thereby avoiding chipping of the insert during location mounting. In addition, the design of the holes and slots also reduces the material cost required to produce the locator pins.

Advantageously, the hole of the positioning needle extension is arranged at the center of the positioning needle extension and the groove of the positioning needle extension is arranged symmetrically about the center, so that the positioning needle extension is at least partially evenly equally divided by the groove, thereby enabling the positioning needle extension to have uniform deformability in all directions.

Advantageously, the positioning pin extension has a chamfer at the second end. By means of the structure of the chamfer part, the positioning pin can be more easily inserted into the positioning hole and the insert hole arranged on the insert, so that the operation difficulty in the injection molding process is reduced.

Advantageously, the bore of the locator pin extension is a through bore extending through the locator pin extension and the locator pin base. This further reduces the material costs required to produce the locating pin.

Advantageously, the detent pin extension slots extend in the axial direction beyond 1/2 of the detent pin extension length to provide sufficient flex capability for the entire detent pin extension.

Advantageously, the outer diameter of the positioning pin base is larger than the outer diameter of the positioning pin extension, thereby forming a stepped structure suitable for the fixed installation of the positioning pin, so that the positioning pin is easy to be stably positioned in the corresponding positioning hole.

On the other hand, advantageously, the positioning pins of the injection mold according to the present disclosure have different outer diameters, which enables an operator to easily determine the installation direction of the insert according to the positioning pins having different sizes and the corresponding insert holes on the insert in the operation of installing the insert to the injection mold.

Furthermore, the locating pins may advantageously be located on the midline, diagonal or other location of the insert to suit the locating requirements of the insert in different applications.

Drawings

The features and advantages of one or more embodiments of the present invention will become more readily apparent from the following detailed description, taken in conjunction with the accompanying drawings. It should be understood that the drawings are shown by way of illustration only and that embodiments of the invention are not limited to the forms shown in the drawings. For purposes of clarity, the same reference numbers will be used in the drawings to identify the same or similar elements, in which:

Figure 1 schematically shows a perspective view of a positioning pin according to the invention;

FIG. 2 schematically illustrates a front view of the positioning pin of FIG. 1;

FIG. 3 schematically illustrates a cross-sectional view taken along line A-A in FIG. 2;

fig. 4 schematically shows a partial perspective view of an injection mould according to the invention, fig. 4 also showing an injection product in the injection mould to illustrate the positional relationship for the sake of clarity;

FIG. 5 schematically illustrates a cross-sectional view taken along line B-B in FIG. 4;

FIG. 6 schematically illustrates a top view of two of the positioning pins of FIG. 5;

FIG. 7 schematically illustrates a front view of the left side locator pin of FIG. 6;

fig. 8 schematically shows a cross-sectional view taken along the line C-C in fig. 7.

Detailed Description

The invention is described in detail below with the aid of exemplary embodiments with reference to the attached drawings. It is to be understood that the following detailed description of the present invention is intended for purposes of illustration only and is not intended to limit the invention, its application, or uses.

The use of directional terms such as "upper" and "lower" in the description is intended for purposes of clarity only and is not intended to limit the manner in which the associated components are oriented. In actual practice, the positional orientation relationship between the components may vary depending on the particular application.

Fig. 1 schematically shows a perspective view of a positioning pin according to the invention, and fig. 2 schematically shows a front view of the positioning pin in fig. 1. As shown in fig. 1, the positioning pin 10 includes: a positioning pin base 11, the positioning pin base 11 being located at a first end of the positioning pin 10; a positioning needle extension 12, the positioning needle extension 12 extending from the positioning needle base 11 towards a second end of the positioning needle 10 opposite to the first end. In one embodiment, the positioning needle base 11 and the positioning needle extension 12 are both formed in a cylindrical shape, and the outer diameter of the positioning needle base 11 is configured to be larger than the outer diameter of the positioning needle extension 12, so that a stepped structure suitable for fixing and mounting the positioning needle is formed at the joint of the two, thereby enabling the positioning needle to be easily and stably positioned and mounted. In the embodiment of fig. 1 and 2, the positioning needle extension 12 has a hole 13 extending from the second end towards the first end and four slots 14, the slots 14 penetrating the positioning needle extension 12 in the radial direction of the positioning needle extension 12.

Referring to fig. 1 and 3, a hole 13, preferably a circular hole, is located in the center of the retaining pin extension 12 and extends through the entire retaining pin. Such a through hole design of the hole 13 penetrating the positioning pin extension 12 and the positioning pin base 11 in the axial direction reduces the material required for producing the positioning pin 10 while making the positioning pin 10 easily deformed, thereby reducing the production cost. It will be understood that the hole 13 may not extend through the entire positioning pin, but may be formed slightly deeper than the groove 14. The four slots 14 are configured symmetrically about the center of the positioning needle extension 12 and evenly distributed in the circumferential direction of the positioning needle extension such that the positioning needle extension 12 is at least partially evenly divided into quarters, thereby providing the positioning needle extension 12 with consistent deformability in all directions. Referring to FIGS. 2 and 3, slots 14 extend in an axial direction to a depth exceeding 1/2 of the axial length of retaining needle extension 12, such as 3/5 of the axial length of retaining needle extension 12, thereby imparting sufficient flex capability to retaining needle extension 12 and reducing the material costs required to produce retaining needle 10.

In the preferred embodiment of the figures, the number of slots 14 is set to 4 and is set symmetrically about the center of the positioning pin extension 12. However, other numbers of slots 14 may be provided and other suitable relative positions between the slots 14 may be provided, depending on the varying deformation requirements in different applications.

By virtue of the structure of the holes 13 and the grooves 14, the inventive locating pin extension 12 has greater elasticity and flexural deformation capability compared to the solid locating pins of the prior art, so that the locating pin extension 12 is easily deformed and deflected away from its axial direction, for example, so that the locating pin extension 12 can be inwardly gathered due to the flexural deformation.

Preferably, as shown in fig. 1, the positioning pin extension 12 is configured to also have a chamfer 15 at the second end, the chamfer 15 being configured to taper inwardly in a radial direction at the tip. By means of the chamfer part 15, the positioning needle 10 can pass through the corresponding hole more easily during the installation process to realize the positioning and fixing functions, thereby reducing the operation difficulty of installing the positioning needle 10.

Fig. 4 schematically shows a perspective view of an injection mold according to the present invention, and fig. 5 schematically shows a cross-sectional view taken along line B-B in fig. 4. Referring to fig. 4 and 5, the injection mold 1 includes: positioning pins 10, 10'; a template 30; and a core 31 disposed in the molding plate 30. The mold plate 30 forms a main body of the injection mold 1, and the mold core 31 is disposed in the mold plate 30 for receiving the injection molding material and the insert. The mold plate 30 is provided with positioning holes 32, 32' penetrating the mold plate 30 and the mold core 31. The locating holes 32, 32 'extend from the bottom of the mold plate 30 to the top surface of the mold core 31 and are shaped to receive corresponding locating pins 10, 10'. Preferably, the bore of the locating bore 32, 32 ' is sized to be correspondingly slightly smaller than the locating pin extension of the locating pin 10, 10 ' to form an interference fit with the locating pin 10, 10 '. The positioning pins 10, 10 'extend from the bottom of the injection mold 1 through the positioning holes 32, 32' respectively to protrude from the mold core 31.

Fig. 4 also shows the injection-molded product 20 in the mold core 31, in which the injection-molded product 20 includes the insert 21 molded therein, in order to clearly show the positional relationship of the parts during the injection molding process. In an actual injection molding process, the insert 21, such as a glass insert, is previously installed in the mold core 31 as a heterogeneous material different from an injection molding material, and the injection molding material, such as a nylon material, is then injected into the mold core 31 to be combined with the insert and cured in the injection molding process, thereby obtaining an integrated product.

It will be understood by those skilled in the art that, although not shown in fig. 4, the injection mold 1 may further include a movable or stationary mold plate, ejector pins, a press cylinder, etc. that mate with the mold plate 30 for performing various operations of mold clamping, mold stripping, pressing, etc. during the injection molding process. Illustratively, during the injection molding process, the insert 21 is pre-installed in a core 31 in the mold plate 30, and a moving or stationary mold plate that mates with the mold plate 30 is then closed with the mold plate 30 to clamp the mold. After the mold is closed, the injection material as a melt is injected into the cavity formed by the core through a gate, runner, or the like in the mold to fill the cavity. After pressure maintaining and cooling setting, the set injection product can be separated from the mold through a mechanism such as an ejector rod in the mold. The operator may then perform subsequent processing and testing of the integrated product, for example, the adhesion between nylon material and glass may be tested.

Referring to fig. 4 and 5, since the insert 21 is provided with the insert holes 22 and 22 'corresponding to the positioning pins 10 and 10', in the operation of pre-installing the insert 21 into the mold core 31 before the injection molding is started, the positioning pins 10 and 10 'only need to correspondingly penetrate through the insert holes 22 and 22' of the insert 21, so that the insert 21 can be kept fixed in position in the mold core 31. Since the pilot pin 10, 10 'has the hole and groove structure as described above, even if the insert holes 22, 22' of the insert 21 are deviated in roundness, hole diameter and position due to machining or the like in the process of passing the pilot pin 10, 10 'through the insert holes 22, 22', the pilot pin 10, 10 'having excellent elasticity and flexural deformability can easily pass through the insert holes 22, 22' without chipping the insert 21. For example, in the case where the insert hole is undersized due to machining errors, the retaining pin will easily pass through the insert hole without applying excessive stress to the insert, since the structure of the retaining pin will allow the retaining pin extensions to flex and bunch inward, thereby avoiding the insert from chipping.

In the embodiment of fig. 4, the locating pins 10, 10' are positioned to lie on the centerline of the insert 21 when the insert 21 is received in the mold insert 31. However, the positioning pins 10, 10' may also be positioned at a diagonal or other location on the insert 21 to suit the positioning requirements of the insert in different applications.

Fig. 6 schematically shows a top view of two of the positioning pins of fig. 5. As shown, the positioning pins 10, 10 'have positioning pin extensions 12, 12' with different outer diameters. This enables an operator to easily determine the mounting direction of the insert according to the positioning pins of different sizes and the corresponding insert positioning holes in the insert during the mounting operation of the insert to the injection mold.

Fig. 7 schematically shows a front view of the left side positioning pin of fig. 6, and fig. 8 schematically shows a cross-sectional view taken along the line C-C of fig. 7. Similar to the positioning pin 10, the positioning pin 10' includes: a positioning pin base 11' at the first end; a positioning needle extension 12 'extending from the positioning needle base 11' to a second end opposite the first end; a hole 13 ' extending through the positioning pin base 11 ' and the positioning pin extension 12 '; a slot 14 'of 1/2 extending beyond the length of the locator needle base 11' in the axial direction; and a chamfered portion 15' at the second end.

As mentioned above, the present application discloses an embodiment and mentions some possible alternatives, which are all within the scope of the present application. In addition, certain obvious modifications which would be recognized by those skilled in the art would also fall within the scope of the present application.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the specific embodiments/examples described and illustrated in detail herein, and that various changes may be made to the exemplary embodiments by those skilled in the art without departing from the scope defined by the appended claims.

Claims (10)

1. A positioning pin, characterized in that it comprises:

a positioning pin base located at a first end of the positioning pin;

a positioning pin extension extending from the positioning pin base to a second end opposite the first end along an axial direction from the first end toward the second end, the positioning pin extension having a hole and a slot extending from the second end toward the first end, the slot penetrating the positioning pin extension in a radial direction of the positioning pin extension.

2. The retaining pin of claim 1, wherein the hole is located at a center of the retaining pin extension and the slot is disposed symmetrically about the center.

3. The locator needle of claim 1 or 2, wherein the locator needle extension has a chamfered portion at the second end, the chamfered portion configured to taper inwardly in the radial direction at a tip.

4. The positioning needle according to claim 1 or 2, wherein the hole is a through hole penetrating the positioning needle base and the positioning needle extension in the axial direction.

5. The locator needle of claim 1 or 2, wherein the extension depth of the groove in the axial direction exceeds 1/2 of the length of the locator needle extension in the axial direction.

6. The positioning needle according to claim 1 or 2, wherein the outer diameter of the positioning needle base is larger than the outer diameter of the positioning needle extension.

7. An injection mold, comprising:

the template is provided with a positioning hole penetrating through the template;

the die core is arranged in the template and used for receiving the insert and the injection molding material, and the die core is also penetrated through by the positioning hole; and

two of the positioning pins according to any one of claims 1 to 6, the positioning pin extensions of the positioning pins being inserted through the positioning holes in the injection mold.

8. An injection mold according to claim 7, wherein the positioning pin extensions of the positioning pins have different outer diameters.

9. An injection mould according to claim 7 or 8, wherein the locating pin is positioned to lie on the centre line of the insert when the insert is received in the mould core.

10. An injection mould according to claim 7 or 8, wherein the locating pins are positioned so as to lie on a diagonal of the insert when the insert is received in the mould core.

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