Double-color injection mold

Abstract

The invention discloses a double-color injection mold which solves the problem that a common turntable double-color rear mold cannot perform injection molding on a soft rubber part after a hard rubber part is molded. Firstly, a rear mold core and a first front mold core are used for conducting injection molding on a hard rubber part of a product, after the hard rubber part of the product is formed, a rotary disc of an injection molding machine is used for exchanging the positions of the first front mold core and a second front mold core, then a shovel base is used for sequentially driving a sliding block and a knife switch to move, and the knife switch retreats; therefore, the forming space of the second forming part is vacated, the forming surface of the rear mold core is changed, and finally, the rear mold core and the second front mold are used for performing injection molding on the soft rubber part of the product, so that the forming work of the product can be completed.

Description

Technical Field

[0001] The invention relates to the technical field of molds, and in particular to a double-color injection mold. Background Art

[0002] The two-color injection molding process is a very classic molding process, that is, two plastic materials are injected on the same two-color injection molding machine, and the molding is divided into two times, but the product is only ejected once; two-color injection molding can meet the appearance requirements of different colors and touches of the product. At present, the most widely used two-color injection mold is the core rotation split type, that is, two molds installed on a two-color injection molding machine are used for injection molding. The front mold shapes of the two molds are different, and the rear mold shapes are exactly the same; after one molding, the mold is opened, and the front and rear molds of the mold are rotated 180° around the center. The mold is re-closed to achieve secondary molding. After the product cools down, the mold is opened again to eject the product.

[0003] like Figure 1 The product A shown has a hard rubber part A1 and a soft rubber part A2. The soft rubber part A2 of the product has a first molding part A21 located on the periphery of the hard rubber part A1 and a second molding part A22 that overlaps with the hard rubber part in multiple places. In this way, after the hard rubber part is injection molded, both the front mold and the rear mold of the two-color injection mold need to be injection molded for the soft rubber part. Since the two-color rear mold of the turntable must have the same mold, and two-color injection molding is achieved by different front mold positions, the molding surface of the conventional two-color rear mold of the turntable cannot be changed. After the hard rubber part of the product is molded, the molding of the soft rubber part does not match the molding surface of the rear mold core, so the soft rubber part cannot be injection molded, which brings difficulties to the large-scale production of such products. Summary of the invention

[0004] The main purpose of the present invention is to provide a two-color injection mold, aiming to solve the problems in the background technology.

[0005] In order to achieve the above object, the technical solutions of the present invention are:

[0006] The present invention discloses a two-color injection mold, comprising:

[0007] A first front mold having a first front mold core;

[0008] A second front mold having a second front mold core;

[0009] The first front mold and the second front mold are respectively fixed on a rotary disk of an injection molding machine;

[0010] Two rear molds, the rear mold having a rear mold core and a support plate, the upper side of the support plate having an open mounting cavity, the rear mold core being arranged in the mounting cavity, the rear mold core and the first front mold core forming a first mold cavity, the first mold cavity being used to mold the hard plastic part of the product, the rear mold core and the hard plastic part of the product forming a second mold cavity together with the second front mold core, the second mold cavity being used to mold the soft plastic part of the product;

[0011] The support plate has a shovel base groove and a slider groove connected in sequence, the shovel base groove is arranged vertically, and the slider groove is arranged horizontally; the rear mold has an oblique channel, and the oblique channel is connected to the slider groove;

[0012] The rear mold is provided with a shovel base, a slider, a gate knife and a driving member, the shovel base is movably arranged at the shovel base groove; the slider is movably arranged at the slider groove; the gate knife is movably arranged at the oblique channel; the end of the gate knife is used to form the molding surface of the hard rubber part and the soft rubber part of the product; the gate knife is slidably connected to the slider at one end close to the slider; the driving member drives the shovel base to reciprocate in the vertical direction;

[0013] After the hard plastic part of the product is formed, the driving member drives the shovel base to move upward. When moving upward, the shovel base drives the slider to move away from the rear mold core. The gate knife moves obliquely downward under the drive of the slider to free up molding space for the second molding part of the product.

[0014] Compared with the prior art, the two-color injection mold provided by the present invention overcomes the problem that the conventional turntable two-color rear mold cannot perform injection molding on the soft rubber part after the hard rubber part is molded. First, the hard rubber part of the product is injection molded using the rear mold core and the first front mold core. After the hard rubber part of the product is molded, the positions of the first front mold core and the second front mold core are swapped using the turntable of the injection molding machine. Then, the shovel base is used to drive the slider and the gate knife to move in turn, so that the gate knife retreats to free up the molding space of the second molding part. At this time, the molding surface at the rear mold core is changed. Finally, the soft rubber part of the product is injection molded using the rear mold core and the second front mold to complete the molding of the product.

[0015] In a preferred embodiment, the shovel base has a guide portion, which is obliquely extended from top to bottom in a direction away from the rear mold core; the sliding block has a through hole, which is obliquely arranged from top to bottom in a direction away from the rear mold core; the guide portion is plugged into the through hole, and the opposite side inclined surfaces of the guide portion are maintained against the opposite side inner wall surfaces of the through hole.

[0016] In a preferred embodiment, a reset assembly is provided on the side of the slider away from the rear mold core, so that when the shovel base moves downward, the reset assembly drives the slider to move toward the rear mold core, so that the opposite side inclined surfaces of the guide portion and the opposite side inner wall surfaces of the through hole are kept against each other.

[0017] In a preferred embodiment, the reset assembly includes a force block, a connecting rod and a spring; the force block is installed on the outer side of the support plate; the connecting rod is passed through the force block and connected to the slider, and the end of the connecting rod away from the slider is provided with a protrusion radially extending from the connecting rod; the spring is sleeved on the connecting rod, one end of the spring is against the force block, and the other end is against the protrusion; when the slider moves toward the rear mold core, the spring is compressed.

[0018] In a preferred embodiment, the reset assembly further comprises a closing cover, which is mounted on the outer side of the force-bearing block, and has a closing cavity on the side of the closing cover facing the force-bearing block, and the closing cavity is used to enclose the connecting rod and the spring, and the diameter of the spring matches the inner diameter of the closing cavity.

[0019] In a preferred embodiment, the bottom surface of the slider close to the gate knife is a first inclined surface, and the first inclined surface extends from top to bottom in a direction away from the gate knife; a second inclined surface is provided at the bottom groove surface of the slider groove close to the oblique channel, and the second inclined surface is parallel to the first inclined surface; when the shovel base moves down to the lowest position, the first inclined surface and the second inclined surface are against each other.

[0020] In a preferred embodiment, an inclined shaft seat is arranged between the knife gate and the slider; the inclined shaft seat has a T-shaped groove and an insertion port; the inclined shaft seat is slidably connected to the slider through the T-shaped groove; the inclined shaft seat is plugged into the knife gate through the insertion port, and at least one pin shaft is passed between the knife gate and the inclined shaft seat.

[0021] In a preferred embodiment, the driving member is a hydraulic cylinder.

[0022] In a preferred embodiment, the two-color injection mold further includes an ejector plate, an ejector pin and an inclined ejector rod; the ejector plate is located below the support plate, the ejector pin is passed through the support plate and the rear mold core, the bottom of the ejector pin is connected to the ejector plate, the inclined ejector rod is passed through the support plate and the rear mold core, and the bottom of the inclined ejector rod is connected to the ejector plate through a guide slider; the ejector pin acts on the hard rubber part of the product, and the inclined ejector rod acts on the soft rubber part of the product.

[0023] In a preferred embodiment, the two-color injection mold also includes a first runner system and a second runner system, and the materials in the first runner system and the second runner system are different; the first runner system is connected to the first feed port on the upper side of the first front mold core; the second runner system is connected to the second feed port on the upper side of the second front mold core.

[0024] For better understanding and implementation, the present invention is described in detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0026] Figure 1 It is the structural diagram of the product;

[0027] Figure 2 It is the structural diagram of the two-color injection mold;

[0028] Figure 3 It is a structural diagram of the connection between the shovel base, slider, gate knife and reset assembly;

[0029] Figure 4 It is a cross-sectional structural diagram of the connection between the shovel base, the slider, the gate knife and the reset assembly;

[0030] Figure 5 It is a cross-sectional view of a two-color injection mold;

[0031] Figure 6 This is a cross-sectional view of a two-color injection mold (some parts are omitted).

[0032] Description of reference numerals:

[0033] 11 first front mold core, 12 second front mold core, 2 rear mold, 21 rear mold core, 22 support plate, 221 shovel base groove, 222 slider groove, 223 oblique channel, 3 shovel base, 31 guide part, 4 slider, 41 through hole, 42 first inclined surface, 5 gate knife, 61 force block, 62 connecting rod, 621 protrusion, 63 spring, 64 closing cover, 641 closing cavity, 7 oblique shaft seat, 8 pin shaft, 91 ejector plate, 92 ejector, 93 oblique ejector rod. DETAILED DESCRIPTION

[0034] In order to better illustrate the present invention, the present invention is further described in detail below with reference to the accompanying drawings.

[0035] It should be clear that the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the embodiments of the present application.

[0036] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the embodiments of the present application. The singular forms of "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0037] Combination Figures 1 to 6 As shown, the present invention discloses a two-color injection mold for producing a product having hard plastic and soft plastic, wherein the soft plastic part of the product has a first molding part located at the periphery of the hard plastic part and a second molding part having multiple overlaps with the hard plastic part, and the two-color injection mold comprises:

[0038] A first front mold, which has a first front mold core 11;

[0039] A second front mold, which has a second front mold core 12;

[0040] The first front mold and the second front mold are respectively fixed on a rotary disk of an injection molding machine;

[0041] Two rear molds 2, the rear mold 2 having a rear mold core 21 and a support plate 22, the upper side of the support plate 22 having an open installation cavity, the rear mold core 21 being arranged in the installation cavity, the rear mold core 21 and the first front mold core 11 forming a first mold cavity, the first mold cavity being used to mold the hard plastic part of the product, the rear mold core 21 and the hard plastic part of the product forming a second mold cavity together with the second front mold core 12, the second mold cavity being used to mold the soft plastic part of the product;

[0042] The support plate 22 has a shovel base groove 221 and a slider groove 222 connected in sequence, the shovel base groove 221 is arranged vertically, and the slider groove 222 is arranged horizontally; the rear mold 2 has an oblique channel 223 in it, and the oblique channel 223 is connected to the slider groove 222;

[0043] The rear mold 2 is provided with a shovel base 3, a slider 4, a gate knife 5 and a driving member. The shovel base 3 is movably arranged at the shovel base groove 221; the slider 4 is movably arranged at the slider groove 222; the gate knife 5 is movably arranged at the oblique channel 223; the end of the gate knife 5 is used to form the molding surface of the hard rubber part and the soft rubber part of the product; the end of the gate knife 5 close to the slider 4 is slidably connected to the slider 4; the driving member drives the shovel base 3 to reciprocate in the vertical direction;

[0044] After the hard plastic part of the product is formed, the driving member drives the shovel base 3 to move upward. When moving upward, the shovel base 3 drives the slider 4 to move away from the rear mold core 21. The gate knife 5 is driven by the slider 4 to move obliquely downward to free up the molding space for the second molding part of the product.

[0045] Compared with the prior art, the two-color injection mold provided by the present invention overcomes the problem that the conventional turntable two-color rear mold cannot perform injection molding on the soft rubber part after the hard rubber part is molded. First, the hard rubber part of the product is injection molded using the rear mold core 21 and the first front mold core 11. After the hard rubber part of the product is molded, the positions of the first front mold core 11 and the second front mold core 12 are swapped using the turntable of the injection molding machine. Then, the shovel base 3 is used to sequentially drive the slider 4 and the gate knife 5 to move so that the gate knife 5 retreats to free up the molding space of the second molding part. At this time, the molding surface at the rear mold core 21 is changed. Finally, the soft rubber part of the product is injection molded using the rear mold core 21 and the second front mold to complete the molding of the product.

[0046] In one embodiment, the shovel base 3 has a guide portion 31, and the guide portion 31 is obliquely extended from top to bottom in a direction away from the rear mold core 21; the slider 4 has a through hole 41, and the through hole 41 is obliquely arranged from top to bottom in a direction away from the rear mold core 21; the guide portion 31 is plugged into the through hole 41, and the inclined surfaces on the opposite sides of the guide portion 31 are kept against the inner wall surfaces on the opposite sides of the through hole 41. When the shovel base 3 moves downward, due to the oblique cooperation between the guide portion 31 and the through hole 41, the slider 4 moves away from the rear mold core 21 along with the movement of the shovel base 3, thereby causing the gate knife 5 to retreat along the oblique channel 223, and the gate knife 5 is separated from the hard rubber part of the product, and space is made to inject the soft rubber part of the product.

[0047] Furthermore, a reset assembly is provided on the side of the slider 4 away from the rear mold core 21, so that when the shovel base 3 moves downward, the reset assembly drives the slider 4 to move toward the rear mold core 21, so that the inclined surfaces on the opposite sides of the guide portion 31 in the horizontal direction are kept against the inner wall surfaces on the opposite sides of the through hole 41 in the horizontal direction, so that the shovel base 3 and the slider 4 are kept in linkage. Specifically, when the shovel base 3 is at the lowest position, the slider 4 is located at the position closest to the mold core, and the end of the gate knife 5 is located at the position where the hard rubber part of the product is formed; when the shovel base 3 starts to move up from the lowest position, the slider 4 moves horizontally away from the mold core under the action of the reset assembly, and the gate knife 5 retreats until the shovel base 3 moves up to the highest position, the slider 4 is pulled out of the farthest position by the shovel base 3, and the gate knife 5 retreats to the lowest position. At this time, the end of the gate knife 5 is located at the position where the soft rubber part of the product is formed. At this time, the shovel base 3 pulls the slider 4 out by 3.9mm, and the gate knife 5 retreats by 2.0mm.

[0048] Furthermore, the reset assembly includes a force block 61, a connecting rod 62 and a spring 63; the force block 61 is installed on the outer side of the support plate 22; the connecting rod 62 is penetrated through the force block 61 and connected to the slider 4, and the end of the connecting rod 62 away from the slider 4 is provided with a protrusion 621 radially extending from the connecting rod 62; the spring 63 is sleeved on the connecting rod 62, one end of the spring 63 is against the force block 61, and the other end is against the protrusion; when the slider 4 moves toward the rear mold core 21, the spring 63 is compressed, and the elastic force of the spring 63 is utilized to allow the slider 4 to automatically move toward the direction close to the rear mold core 21 and reset as the shovel base 3 rises after being pulled out by the shovel base 3. At the same time, the spring 63 is arranged on the outside of the rear mold core 21 instead of the inside of the rear mold core 21, so there is no need to make additional space inside the rear mold core 21 for installing the spring 63, which is beneficial to reducing the volume of the rear mold core 21 and simplifying the spatial layout inside the rear mold core 21.

[0049] Furthermore, since the spring 63 is exposed, in order to protect the spring 63 from collision and influence by external objects, the reset assembly also includes a closing cover 64, and the closing cover 64 is installed on the outside of the force block 61. The side of the closing cover 64 facing the force block 61 has a closing cavity 641, and the closing cavity is used to enclose the connecting rod 62 and the spring 63. The diameter of the spring 63 matches the inner diameter of the closing cavity 641.

[0050] Furthermore, the bottom surface of the slider 4 near the gate blade 5 is a first inclined surface 42, and the first inclined surface 42 is extended from top to bottom in a direction away from the gate blade 5; the bottom groove surface of the slider groove 222 near the oblique channel 223 is provided with a second inclined surface 2221, and the second inclined surface 2221 is arranged parallel to the first inclined surface 42; when the shovel base 3 moves down to the lowest position, the first inclined surface 42 and the second inclined surface 2221 are against each other. The cooperation of the first inclined surface 42 and the second inclined surface 2221 is used to support the gate blade, prevent the gate blade from moving, and allow the gate blade to cooperate better.

[0051] Furthermore, an inclined shaft seat 7 is provided between the gate knife 5 and the slider 4; the inclined shaft seat 7 has a T-shaped groove opening 71 and an insertion interface; the inclined shaft seat 7 is slidably connected with the slider 4 through the T-shaped groove opening; the inclined shaft seat 7 is plugged with the gate knife 5 through the insertion interface, and at least one pin 8 is passed between the gate knife 5 and the inclined shaft seat 7. The inclined shaft seat 7 is manufactured separately from the gate knife 5, rather than combining the two parts into an integral part, because the gate knife 5 is a precision machined part, and the slow wire processing is performed separately to ensure the matching accuracy between the gate knife and the inner mold.

[0052] In one embodiment, the driving member is a hydraulic cylinder or a pneumatic cylinder to drive the shovel base 3 to perform linear reciprocating motion.

[0053] In one embodiment, the two-color injection mold further includes an ejector plate 91, an ejector pin 92 and an inclined ejector rod 93; the ejector plate 91 is located below the support plate 22, the ejector pin 92 is passed through the support plate 22 and the rear mold core 21, the bottom of the ejector pin 92 is connected to the ejector plate 91, the inclined ejector rod 93 is passed through the support plate 22 and the rear mold core 21, and the bottom of the inclined ejector rod 93 is connected to the ejector plate 91 through a guide slider 4; the ejector pin 92 acts on the hard rubber part of the product, and the inclined ejector rod 93 acts on the soft rubber part of the product. The acting surface of the inclined ejector rod 93 is relatively large, so that the soft rubber part of the product will not be damaged while ejecting the product.

[0054] In one embodiment, in the present invention, due to the different materials and distributions of the hard glue and the soft glue, it is necessary to design corresponding runners at the first front mold core 11 and the second front mold core 12. Therefore, the two-color injection mold also includes a first runner system and a second runner system. The materials in the first runner system and the second runner system are different; the first runner system is connected to the first feed port on the upper side of the first front mold core 11; the second runner system is connected to the second feed port on the upper side of the second front mold core 12.

[0055] The present invention is not limited to the above-mentioned embodiments. If various changes or modifications to the present invention do not depart from the spirit and scope of the present invention, and if these changes and modifications fall within the scope of the claims and equivalent technologies of the present invention, the present invention is also intended to include these changes and modifications.

Claims

1. A two-color injection mold, characterized in that: include: A first front mold having a first front mold core; A second front mold having a second front mold core; The first front mold and the second front mold are respectively fixed on a rotary disk of an injection molding machine; Two rear molds, the rear mold having a rear mold core and a support plate, the upper side of the support plate having an open mounting cavity, the rear mold core being arranged in the mounting cavity, the rear mold core and the first front mold core forming a first mold cavity, the first mold cavity being used to mold the hard plastic part of the product, the rear mold core and the hard plastic part of the product forming a second mold cavity together with the second front mold core, the second mold cavity being used to mold the soft plastic part of the product; The support plate has a shovel base groove and a slider groove connected in sequence, the shovel base groove is arranged vertically, and the slider groove is arranged horizontally; the rear mold has an oblique channel, and the oblique channel is connected to the slider groove; the rear mold is provided with a shovel base, a slider, a gate knife and a driving member, the shovel base is movably arranged at the shovel base groove; the slider is movably arranged at the slider groove; the gate knife is movably arranged at the oblique channel; the end of the gate knife is used to form the molding surface of the hard rubber part and the soft rubber part of the product; the gate knife is slidably connected to the slider at one end close to the slider; the driving member drives the shovel base to reciprocate in the vertical direction; After the hard plastic part of the product is formed, the driving member drives the shovel base to move upward. When moving upward, the shovel base drives the slider to move away from the rear mold core. The gate knife moves obliquely downward under the drive of the slider to free up molding space for the second molding part of the product.

2. The two-color injection mold according to claim 1, characterized in that: The shovel base has a guide portion, and the guide portion is obliquely extended from top to bottom in a direction away from the rear mold core; The slider has a through hole, and the through hole is arranged obliquely from top to bottom in a direction away from the rear mold core; The guide portion is plugged into the through hole, and the inclined surfaces on two opposite sides of the guide portion are in contact with the inner wall surfaces on two opposite sides of the through hole.

3. The two-color injection mold according to claim 2, characterized in that: A reset component is provided on the side of the slider away from the rear mold core, so that when the shovel base moves downward, the reset component drives the slider to move towards the rear mold core, so that the opposite side inclined surfaces of the guide part and the opposite side inner wall surfaces of the through hole are kept against each other.

4. The two-color injection mold according to claim 3, characterized in that: The reset assembly includes a force block, a connecting rod and a spring; The force bearing block is installed on the outer side of the support plate; The connecting rod is passed through the force bearing block and connected to the slider, and a protrusion extending radially from the connecting rod is provided at one end of the connecting rod away from the slider; The spring is sleeved on the connecting rod, one end of the spring is against the force block, and the other end is against the protruding portion; when the sliding block moves toward the rear mold core, the spring is compressed.

5. The two-color injection mold according to claim 4, characterized in that: The reset assembly also includes a closing cover, which is installed on the outside of the force-bearing block. The closing cover has a closing cavity on the side facing the force-bearing block, and the closing cavity is used to enclose the connecting rod and the spring. The diameter of the spring matches the inner diameter of the closing cavity.

6. The two-color injection mold according to claim 4, characterized in that: The bottom surface of the sliding block on one side close to the gate knife is a first inclined surface, and the first inclined surface is extended from top to bottom in a direction away from the gate knife; A second inclined surface is provided at the bottom groove surface of the slider groove near the oblique channel, and the second inclined surface is provided in parallel with the first inclined surface; When the shovel base moves down to the lowest position, the first inclined surface abuts against the second inclined surface.

7. The two-color injection mold according to claim 1, characterized in that: An oblique shaft seat is provided between the gate knife and the slider; The oblique shaft seat has a T-shaped groove and an insertion port; The inclined shaft seat is slidably connected to the slider through the T-shaped groove; The oblique shaft seat is plugged with the switch blade through the plug interface, and at least one pin is provided between the switch blade and the oblique shaft seat.

8. The two-color injection mold according to claim 1, characterized in that: The driving member is a hydraulic cylinder.

9. The two-color injection mold according to claim 1, characterized in that: The two-color injection mold also includes an ejector plate, an ejector pin and an inclined ejector rod; The ejector plate is located below the support plate, the ejector is provided through the support plate and the rear mold core, the bottom of the ejector is connected to the ejector plate, the inclined ejector rod is provided through the support plate and the rear mold core, the bottom of the inclined ejector rod is connected to the ejector plate through a guide slider; the ejector acts on the hard rubber part of the product, and the inclined ejector rod acts on the soft rubber part of the product.

10. The two-color injection mold according to claim 1, characterized in that: The two-color injection mold further includes a first flow channel system and a second flow channel system, wherein the materials in the first flow channel system and the second flow channel system are different; The first flow channel system is connected to the first feed port on the upper side of the first front mold core; The second flow channel system is communicated with a second feed port on the upper side of the second front mold core.

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