Bushing positioning and supporting mechanism, injection mold and injection molding method

Abstract

The invention discloses a lining positioning and supporting mechanism, an injection mold and an injection molding method. The bushing positioning and supporting mechanism comprises inserts, wherein the inserts comprise a fixed insert and a floating insert; a parallelogram cavity is defined by the fixed insert and the floating insert; a reciprocating linear motion freedom degree is formed between the fixed insert and the floating insert; the positioning needle penetrates through the floating insert, and one end of the positioning needle can abut against the inner wall of the parallelogram cavity; the positioning pin and the sliding block are coaxially arranged, and a lining can be arranged at the junction of the positioning pin and the sliding block; the positioning pin has the axial translation freedom degree along with the sliding block, and the reciprocating linear motion direction of the fixed insert and the floating insert is perpendicular to the axial translation direction of the positioning pin; the inner wall of the parallelogram cavity comprises a vertical face perpendicular to the axial translation direction of the positioning pin and further comprises an inclined face forming a non-right-angle included angle with the axial translation direction of the positioning pin. By the adoption of the bushing positioning device, positioning of the bushing is facilitated, and the positioning precision of the bushing is improved.

Description

Technical Field

[0001] The invention relates to the field of molds, and in particular to a bushing positioning support mechanism, an injection mold and an injection molding method. Background Art

[0002] There is a composite material injection molded part, the main body of which is an injection molded material, and a bushing is embedded and fixed, and the bushing is generally made of different materials such as metal. The processing form of this injection molded part is generally to put the bushing into the injection molded part, and then injection mold it. The plastic main body of the injection molded part is processed, and the plastic main body of the injection molded part is also bonded and fixed to the bushing.

[0003] The axial direction of the bushing hole is the lateral slider core pulling, and the bushing must be placed on the slider to meet the ejection of the product. The lateral slider structure, the bushing must be placed on the slider to achieve the positioning of the bushing.

[0004] The slider structure sinks inside the male mold, the sinking depth is relatively large, the space is relatively small, and the bushing is difficult to implant. The existing mold with a similar structure can be inserted into the bushing, but the insertion efficiency is low and it is easy to tilt, that is, the positioning accuracy is difficult to ensure, and the probability of failure caused by the bushing not being implanted in place is very high. Summary of the invention

[0005] The problem to be solved by the present invention is to provide a bushing positioning support mechanism, an injection mold and an injection molding method, which facilitates the positioning of the bushing and improves the positioning accuracy of the bushing.

[0006] In order to solve the above problems, the present invention provides a bushing positioning support mechanism, an injection mold and an injection molding method. In order to achieve the above objects, the technical solution adopted by the present invention to solve the technical problems is:

[0007] A bushing positioning support mechanism comprises: inserts, including fixed inserts and floating inserts; a parallelogram cavity is formed between the fixed insert and the floating insert; the fixed insert and the floating insert have the freedom of reciprocating linear motion; a positioning pin passes through the floating insert, and one end of the positioning pin can abut against the inner wall of the parallelogram cavity; a slider, the positioning pin is coaxially arranged with the slider, and a bushing can be arranged at the junction of the positioning pin and the slider; the positioning pin has the freedom of axial translation following the slider, and the reciprocating linear motion direction of the fixed insert and the floating insert is perpendicular to the axial translation direction of the positioning pin; the inner wall of the parallelogram cavity includes a vertical surface perpendicular to the axial translation direction of the positioning pin, and also includes an inclined surface that is at a non-right angle to the axial translation direction of the positioning pin.

[0008] The beneficial effects of adopting the above technical solution are: the mechanism can not only meet the needs of bushing positioning and support, but also facilitate implantation. The slider structure is simple and the structure operates smoothly. The parallelogram cavity uses its own vertical surface and inclined surface to associate with the forward or retracting function of the positioning pin. The bushing is well positioned and can be easily implanted. This can improve efficiency and reduce production defects. It is suitable for use in the field of injection molds and is suitable for processing injection molded parts with bushings fixed thereon.

[0009] As a further improvement of the present invention, the fixed insert has an integrated boss on one side facing the floating insert, and the floating insert has an inner groove on one side facing the fixed insert, and the boss can slide in the inner groove.

[0010] The beneficial effect of adopting the above technical solution is: ensuring the linear guidance of the vertical relative sliding of the fixed insert and the floating insert.

[0011] As a further improvement of the present invention, the inner wall of the inner groove includes a lower inclined surface and an upper vertical surface, the top of the lower inclined surface intersects with the bottom of the upper vertical surface, and an obtuse internal angle is formed at the intersection of the lower inclined surface and the upper vertical surface; the side wall of the boss includes an upper inclined surface, and the outer wall of the fixed insert also includes a lower vertical surface, the bottom of the upper inclined surface intersects with the top of the lower vertical surface, and an obtuse internal angle is formed at the intersection of the upper inclined surface and the lower vertical surface; the lower inclined surface, the upper vertical surface, the upper inclined surface, and the lower vertical surface form a parallelogram cavity, and the cross-sectional profile of the parallelogram cavity is a parallelogram.

[0012] As a further improvement of the present invention, one end of the positioning pin can selectively contact the upper inclined surface or the lower vertical surface.

[0013] The beneficial effect of adopting the above technical solution is that when one end of the positioning needle contacts the upper inclined surface, the force will cause the positioning needle to move along its own axis, and when one end of the positioning needle contacts the lower vertical surface, the positioning needle will not move along its own axis.

[0014] As a further improvement of the present invention, one end of the positioning needle has an oblique end face and a vertical end face that intersect with each other. The oblique end face intersects with the vertical end face, and a positive angle is formed at the intersection of the oblique end face and the vertical end face; the oblique end face is parallel to the upper oblique face, and the vertical end face is parallel to the lower vertical face.

[0015] The beneficial effect of adopting the above technical solution is that the shape of the oblique end surface and the vertical end surface of one end of the positioning needle enables it to be stably limited at the junction with the upper oblique surface and the lower vertical surface.

[0016] As a further improvement of the present invention, the inner wall of the inner groove is further recessed with a guide groove, and symmetrically protruding convex wings are provided on both sides of the locating needle. The convex wings are movably assembled with the guide groove, and the extension direction of the guide groove is parallel to the axial direction of the locating needle.

[0017] The beneficial effect of adopting the above technical solution is that the guide groove and the convex wing portion further ensure that the positioning column will not rotate on its own, and further ensure that the positioning needle performs reciprocating linear motion along its own axial direction.

[0018] As a further improvement of the present invention, the floating insert is also equipped with a positioning pin, and the end of the positioning pin facing the fixed insert has a hemispherical head; the side of the fixed insert facing the floating insert has two positioning pits, and the hemispherical head can selectively contact the two positioning pits.

[0019] The beneficial effect of adopting the above technical solution is that the separation of the positioning pit of the hemispherical head needs to overcome a certain clamping force, so the positioning pin is equivalent to providing a certain degree of positioning to ensure that the fixed insert and the floating insert will stop at the specified extreme position.

[0020] As a further improvement of the present invention, the end of the slider facing the positioning needle has a blind hole, and the end of the slider facing the positioning needle also has a notch, and the plurality of notches are arranged in a circular array around the blind hole, and the depth of the blind hole is greater than the depth of the notch.

[0021] The beneficial effect of adopting the above technical solution is that the blind hole and the notch can weaken the structural strength of the slider end and improve the elasticity of the slider end, especially the elastic force in the radial direction, which facilitates the disassembly and assembly of the bushing.

[0022] An injection mold comprises the above bushing positioning and supporting mechanism.

[0023] An injection molding method includes the above-mentioned bushing positioning support mechanism, and the injection molding method includes: step S1, the floating insert is in an ejected state and the bushing is implanted; step S2, the bushing is implanted in the mold and the floating insert is reset; step S3, the slider moves forward to push back the positioning pin, the bushing remains on the slider, and then injection molding is performed, and an injection molded workpiece including the bushing is formed after injection molding; step S4, the slider moves backward to separate from the injection molded workpiece, and the mold is ready for ejection; step S5, the injection molded workpiece is ejected 10 mm, the floating insert is ejected delayed, and is ejected again after the injection molded workpiece is separated from the positioning pin; step S6, the injection molded workpiece is ejected 20 mm, the floating insert is ejected again, and the positioning pin of the bushing is pushed out again; step S7, return to step S1, and repeat the cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1It is a three-dimensional diagram of an embodiment of an injection molded workpiece and a bushing of the present invention;

[0026] Figure 2 is a three-dimensional diagram of an embodiment of the bushing positioning support mechanism of the present invention;

[0027] Figure 3 is a side view of an embodiment of the bushing positioning and supporting mechanism of the present invention;

[0028] Figure 4 is an AA cross-sectional view of an embodiment of the bushing positioning and supporting mechanism of the present invention;

[0029] Figure 5 It is a three-dimensional diagram of an embodiment of the floating insert, the slider, and the positioning pin of the present invention;

[0030] Figure 6 It is a three-dimensional diagram of an embodiment of the fixed insert, the slider, the positioning needle and the positioning pin of the present invention;

[0031] Figure 7 It is a stereoscopic diagram of an embodiment of the bushing, the slider, the positioning needle and the positioning pin of the present invention;

[0032] Figure 8 It is an application schematic diagram of an implementation mode of the bushing positioning support mechanism of the present invention;

[0033] Fig. 9 It is an application schematic diagram of an implementation mode of the bushing positioning support mechanism of the present invention;

[0034] Fig.10 It is an application schematic diagram of an implementation mode of the bushing positioning support mechanism of the present invention;

[0035] Fig.11 It is an application schematic diagram of an implementation mode of the bushing positioning support mechanism of the present invention;

[0036] Fig.12 It is an application schematic diagram of an implementation mode of the bushing positioning support mechanism of the present invention;

[0037] Fig.13 It is an application schematic diagram of an implementation mode of the bushing positioning support mechanism of the present invention;

[0038] Fig.14 It is an application schematic diagram of an implementation mode of the bushing positioning support mechanism of the present invention;

[0039] Fig.15 It is an application schematic diagram of an implementation mode of the bushing positioning support mechanism of the present invention;

[0040] Fig.16It is an application schematic diagram of an implementation mode of the bushing positioning support mechanism of the present invention.

[0041] 1-injection molded workpiece; 2-bushing; 3-fixed insert; 31-boss; 311-upper inclined surface; 312-lower vertical surface; 32-positioning pit; 4-floating insert; 41-inner groove; 411-lower inclined surface; 412-upper vertical surface; 413-guide groove; 5-slider; 51-notch; 52-blind hole; 6-locating pin; 61-hemispherical head; 7-locating needle; 71-oblique end surface; 72-vertical end surface; 73-convex wing portion; 8-parallelogram cavity. DETAILED DESCRIPTION

[0042] The present invention is further described in detail below in conjunction with specific embodiments:

[0043] In order to achieve the purpose of the present invention, a bushing positioning support mechanism is provided, comprising: inserts, including a fixed insert 3 and a floating insert 4; a parallelogram cavity 8 is formed between the fixed insert 3 and the floating insert 4; the fixed insert 3 and the floating insert 4 have the freedom of reciprocating linear motion; a positioning pin 7, which passes through the floating insert 4, and one end of the positioning pin 7 can abut against the inner wall of the parallelogram cavity 8; a slider 5, the positioning pin 7 is coaxially arranged with the slider 5, and the bushing 2 can be arranged at the junction of the positioning pin 7 and the slider 5; the positioning pin 7 has the freedom of axial translation following the slider 5, and the reciprocating linear motion direction of the fixed insert 3 and the floating insert 4 is perpendicular to the axial translation direction of the positioning pin 7; the inner wall of the parallelogram cavity 8 includes a vertical surface perpendicular to the axial translation direction of the positioning pin 7, and also includes an inclined surface that is at a non-right angle to the axial translation direction of the positioning pin 7.

[0044] like Figure 4 As shown, the bushing 2 is placed on the slider 5 on the right, and there is a flat surface on the left side for pressing. The slider 5 performs flat pressing to meet the requirements of clamping and positioning of the bushing 2.

[0045] like Figure 1 The injection molded workpiece 1 shown is a product, which includes an injection molded material body, and a bushing 2 is fixed to the injection molded workpiece 1. The outer rim of the bushing 2 is fixed to the injection molded material body.

[0046] The beneficial effects of adopting the above technical solution are: the mechanism can not only meet the needs of bushing positioning and support, but also facilitate implantation. The slider structure is simple and the structure operates smoothly. The parallelogram cavity uses its own vertical surface and inclined surface to associate with the forward or retracting function of the positioning pin. The bushing is well positioned and can be easily implanted. This can improve efficiency and reduce production defects. It is suitable for use in the field of injection molds and is suitable for processing injection molded parts with bushings fixed thereon.

[0047] like Figure 4 and Figure 6As shown, in some other embodiments of the present invention, the fixed insert 3 has an integral boss 31 on one side facing the floating insert 4. Figure 4 and Figure 5 As shown, the floating insert 4 has an inner groove 41 on one side facing the fixed insert 3 , and the boss 31 can slide in the inner groove 41 .

[0048] The beneficial effect of adopting the above technical solution is: ensuring the linear guidance of the vertical relative sliding of the fixed insert and the floating insert.

[0049] In some other embodiments of the present invention, the inner wall of the inner groove 41 includes a lower inclined surface 411 and an upper vertical surface 412, the top of the lower inclined surface 411 intersects with the bottom of the upper vertical surface 412, and the intersection of the lower inclined surface 411 and the upper vertical surface 412 forms an obtuse internal angle; the side wall of the boss 31 includes an upper inclined surface 311, and the outer wall of the fixed insert 3 also includes a lower vertical surface 312, the bottom of the upper inclined surface 311 intersects with the top of the lower vertical surface 312, and the intersection of the upper inclined surface 311 and the lower vertical surface 312 forms an obtuse internal angle; the lower inclined surface 411, the upper vertical surface 412, the upper inclined surface 311, and the lower vertical surface 312 surround a parallelogram cavity 8. Figure 4 As shown, the cross-sectional profile of the parallelogram cavity 8 is a parallelogram.

[0050] The beneficial effect of adopting the above technical solution is that when one end of the positioning needle contacts the upper inclined surface, the force will cause the positioning needle to move along its own axis, and when one end of the positioning needle contacts the lower vertical surface, the positioning needle will not move along its own axis.

[0051] In some other embodiments of the present invention, one end of the positioning pin 7 may selectively contact the upper inclined surface 311 or the lower vertical surface 312 .

[0052] The vertical surfaces in the inner wall of the parallelogram cavity 8 include an upper vertical surface 412 and a lower vertical surface 312 , and the inclined surfaces in the inner wall of the parallelogram cavity 8 include a lower inclined surface 411 and an upper inclined surface 311 .

[0053] like Figure 7 As shown, in some other embodiments of the present invention, one end of the positioning pin 7 has an intersecting oblique end face 71 and a vertical end face 72, the oblique end face 71 intersects with the vertical end face 72, and a positive angle is formed at the intersection of the oblique end face 71 and the vertical end face 72; the oblique end face 71 is parallel to the upper oblique face 311, and the vertical end face 72 is parallel to the lower vertical face 312.

[0054] The beneficial effect of adopting the above technical solution is that the shape of the oblique end surface and the vertical end surface of one end of the positioning needle enables it to be stably limited at the junction with the upper oblique surface and the lower vertical surface.

[0055] like Figure 5As shown, in some other embodiments of the present invention, the inner wall of the inner groove 41 is further recessed with a guide groove 413. Figure 7 As shown, the locating pin 7 has symmetrical protrusions on both sides with convex wing portions 73 , which are movably assembled with the guide groove 413 , and the extending direction of the guide groove 413 is parallel to the axial direction of the locating pin 7 .

[0056] The beneficial effect of adopting the above technical solution is that the guide groove and the convex wing portion further ensure that the positioning column will not rotate on its own, and further ensure that the positioning needle performs reciprocating linear motion along its own axial direction.

[0057] In some other embodiments of the present invention, the floating insert 4 is also equipped with a positioning pin 6, and the positioning pin 6 has a hemispherical head 61 on one end facing the fixed insert 3; the fixed insert 3 has two positioning pits 32 on one side facing the floating insert 4, and the hemispherical head 61 can selectively contact the two positioning pits 32.

[0058] The beneficial effect of adopting the above technical solution is that the separation of the positioning pit of the hemispherical head needs to overcome a certain clamping force, so the positioning pin is equivalent to providing a certain degree of positioning to ensure that the fixed insert and the floating insert will stop at the specified extreme position.

[0059] In other embodiments of the present invention, the end of the slider 5 facing the positioning pin 7 has a blind hole 52, and the end of the slider 5 facing the positioning pin 7 also has a notch 51. Several notches 51 are arranged in a circular array around the blind hole 52, and the depth of the blind hole 52 is greater than the depth of the notch 51.

[0060] The beneficial effect of adopting the above technical solution is that the blind hole and the notch can weaken the structural strength of the slider end and improve the elasticity of the slider end, especially the elastic force in the radial direction, which facilitates the disassembly and assembly of the bushing.

[0061] An injection mold comprises the above bushing positioning and supporting mechanism.

[0062] An injection molding method includes the above-mentioned bushing positioning support mechanism, and the injection molding method includes: step S1, the floating insert 4 is in the ejection state, and the bushing 2 is manually implanted. Step S2, the bushing 2 has been implanted in the mold, and the floating insert 4 is manually reset. Step S3, the slider 5 enters, and the positioning pin 7 in the floating insert 4 is ejected, and the bushing 2 remains on the slider 5 structure, followed by injection molding. Step S4, the slider 5 moves backward, separates from the product, and the mold is ready for ejection. Step S5, the product is ejected 10mm, and the bushing 2 and the floating insert 4 are delayed in ejection, and are ejected again after the product is separated from the bushing 2 and the positioning pin 7. Step S6, the product is ejected 20mm, the floating insert 4 is ejected again, and the positioning pin 7 of the bushing 2 is pushed out again, which is convenient for implanting the bushing 2. Step S7, the mold returns to the first step, the floating insert 4 is ejected, and the bushing 2 needs to be implanted to enter the next cycle.

[0063] like Figure 8 The bushing 2 and the floating insert 4 are not ejected. Fig. 9 The bushing 2 and the floating insert 4 are in the ejected state. Fig.10 The floating insert 4 is in the ejected state, and the bushing 2 is manually implanted. Fig.11 The bushing 2 has been implanted in the mold and the floating insert 4 is manually reset. Fig.12 The slider 5 enters, pushes back the positioning pin 7 in the floating insert 4, and the bushing 2 remains on the slider 5 structure, followed by injection molding. Fig.13 The slider 5 moves backward (i.e. Figure 4 The mold moves to the right of the product to prepare for ejection. Fig.14 The product is ejected 10 mm, and the bushing 2 and the floating insert 4 are delayed in ejecting, and the product is ejected after it is separated from the bushing 2 and the positioning pin 7. Fig.15 The slider 5 enters, pushes back the positioning pin 7 in the floating insert 4, and the bushing 2 remains on the slider 5 structure, followed by injection molding. Fig.16 The slider 5 moves backwards, separates from the product, and the mold is ready for ejection.

[0064] The design principle behind it: Since the sinking space of the slider 5 is too small, it is difficult to put the bushing 2 in, so the bushing 2 is placed on the male mold insert, which is the floating insert 4. The floating insert 4 is ejected when the mold is ejected. At this time, the bushing 2 is placed on the floating insert 4 to complete the implantation of the bushing 2. The floating insert 4 is manually pressed into the mold. After the floating insert 4 is in place, the positioning pin 7 of the slider 5 is inserted into the hole of the bushing 2, and the positioning pin 7 of the floating insert 4 is pushed back, thus completing the implantation of the bushing 2 and the functional requirements of lateral core pulling.

[0065] Figure 8 and Fig. 9 It is also a three-dimensional picture. Figures 10 to 16 It is also a cross-sectional view.

[0066] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the content of the present invention and implement it. They cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A bushing positioning support mechanism, characterized in that: include: The insert comprises a fixed insert and a floating insert; a parallelogram cavity is formed between the fixed insert and the floating insert; the fixed insert and the floating insert have a reciprocating linear motion freedom; A positioning pin passes through the floating insert, and one end of the positioning pin can abut against the inner wall of the parallelogram cavity; The slider, the positioning pin is coaxially arranged with the slider, and a bushing can be arranged at the junction of the positioning pin and the slider; the positioning pin has the freedom of axial translation following the slider, and the reciprocating linear motion direction of the fixed insert and the floating insert is perpendicular to the axial translation direction of the positioning pin; The inner wall of the parallelogram cavity includes a vertical surface perpendicular to the axial translation direction of the positioning pin, and also includes an inclined surface forming a non-right angle with the axial translation direction of the positioning pin.

2. The bushing positioning and supporting mechanism according to claim 1, characterized in that: The fixed insert has an integrated boss on one side facing the floating insert, and the floating insert has an inner groove on one side facing the fixed insert. The boss can slide in the inner groove.

3. The bushing positioning and supporting mechanism according to claim 2, characterized in that: The inner wall of the inner groove includes a lower inclined surface and an upper vertical surface, the top of the lower inclined surface intersects with the bottom of the upper vertical surface, and the intersection of the lower inclined surface and the upper vertical surface forms an obtuse inner angle; The side wall of the boss includes an upper inclined surface, and the outer wall of the fixed insert also includes a lower vertical surface, the bottom of the upper inclined surface intersects with the top of the lower vertical surface, and the intersection of the upper inclined surface and the lower vertical surface forms an obtuse internal angle; The lower inclined surface, the upper vertical surface, the upper inclined surface, and the lower vertical surface form a parallelogram cavity, and the cross-sectional profile of the parallelogram cavity is a parallelogram.

4. The bushing positioning and supporting mechanism according to claim 1, characterized in that: One end of the positioning pin may selectively contact the upper inclined surface or the lower vertical surface.

5. The bushing positioning and supporting mechanism according to claim 3, characterized in that: One end of the positioning needle has an intersecting oblique end face and a vertical end face, the oblique end face intersects with the vertical end face, and a positive angle is formed at the intersection of the oblique end face and the vertical end face; the oblique end face is parallel to the upper oblique face, and the vertical end face is parallel to the lower vertical face.

6. The bushing positioning and supporting mechanism according to claim 2, characterized in that: The inner wall of the inner groove is also sunken with a guide groove, and convex wings are symmetrically raised on both sides of the positioning needle. The convex wings are movably assembled with the guide groove, and the extension direction of the guide groove is parallel to the axial direction of the positioning needle.

7. The bushing positioning and supporting mechanism according to claim 1, characterized in that: The floating insert is also equipped with a positioning pin, and the end of the positioning pin facing the fixed insert is provided with a hemispherical head; the side of the fixed insert facing the floating insert is provided with two positioning pits, and the hemispherical head can selectively contact the two positioning pits.

8. The bushing positioning and supporting mechanism according to claim 1, characterized in that: The end of the slider facing the positioning needle is provided with a blind hole, and the end of the slider facing the positioning needle is also provided with a notch, and a plurality of notches are arranged in a ring array around the blind hole, and the depth of the blind hole is greater than the depth of the notch.

9. An injection mold, characterized in that: It comprises the bushing positioning and supporting mechanism as claimed in any one of claims 1 to 8.

10. An injection molding method, characterized in that: Comprising the bushing positioning support mechanism according to any one of claims 1 to 8, the injection molding method comprises: Step S1, the floating insert is in an ejected state and implanted into a bushing; Step S2, the bushing is implanted into the mold to reset the floating insert; Step S3, the slider moves forward to push the positioning pin back, the bushing remains on the slider, and then injection molding is performed, and an injection molded workpiece including the bushing is formed after the injection molding; Step S4, the slider moves backward to separate from the injection molded workpiece, and the mold is ready for ejection; Step S5, the injection molded workpiece is ejected 10 mm, and the floating insert is ejected with a delay, and is ejected after the injection molded workpiece is separated from the positioning pin; Step S6, the injection molded workpiece is ejected 20 mm, the floating insert is ejected again, and the positioning pin of the bushing is pushed out again; Step S7, return to step S1, and repeat the process.

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