Side point glue inlet runner structure of three-plate mold and three-plate mold

Abstract

The utility model provides a side point glue inlet runner structure of a three-plate mold and the three-plate mold. The side point glue inlet runner structure of the three-plate mold comprises a front mold core and a rear mold core. The front mold core is provided with a sub-runner group, and one end of the sub-runner group is communicated with the main runner; and an upper surface forming groove is formed in the bottom surface of the front mold core. A lower surface forming groove is formed in the top face of the rear mold core, when the front mold core and the rear mold core are closed, the upper surface forming groove and the lower surface forming groove jointly define a watchband forming filling cavity, a plurality of heat dissipation hole forming male mold parts are distributed in the watchband forming filling cavity at intervals, and a plurality of heat dissipation holes are formed through the heat dissipation hole forming male mold parts. A first side pin-point gate and a second side pin-point gate which are respectively communicated with the other end of the sub-runner group are formed in two sides of at least one heat dissipation hole forming male die part, and the other end of the sub-runner group is communicated with the watchband forming filling cavity through the first side pin-point gate and the second side pin-point gate.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molds, in particular to a side point glue inlet flow channel structure of a three-plate mold and the three-plate mold. Background Art

[0002] Common soft rubber watch straps on the market now include silicone straps, rubber straps, TPU straps and TPSiV straps. Among them, TPU (thermoplastic polyurethane elastomer, also known as thermoplastic polyurethane rubber, referred to as TPU) straps have good wear resistance and elasticity. At the same time, TPU is also an environmentally friendly material, which meets the current environmental protection trend requirements. Therefore, TPU straps are widely used in smart watches.

[0003] For example, Chinese patent document CN105856507A discloses a gate structure and molding method for an injection mold of a soft rubber watch strap product, including a runner arranged on the injection mold, a point gate is arranged between the end of the runner and the cavity of the injection mold, and the point gate is arranged correspondingly at a strap hole position of the soft rubber watch strap product.

[0004] However, the technical solution disclosed in the above patent still has the following problems: although the gate structure of the injection mold replaces the traditional side gate injection method with a point gate, and the point gate is opened at the uncommon TPU strap hole (i.e., the heat dissipation hole of the strap), so that the shear marks at the product's gate are not obvious, it is necessary to use a punch to cut the water inlet to achieve the purpose of trimming the gate, thereby increasing the product's transportation time from injection molding to placing it on the punch to cut the water inlet; at the same time, the punch has high requirements on the accuracy of the punching of the strap hole (for example, the positioning accuracy of the strap on the punch, and the accuracy of the center hole of the punched strap hole, will cause errors in the position and size of multiple strap holes on the strap, resulting in poor aesthetics of the product), thereby increasing the production cycle of the product and reducing the production efficiency of the product. Utility Model Content

[0005] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a side point glue feed channel structure and a three-plate mold that can automatically cut the product water outlet to ensure the product aesthetics, reduce the product production cycle, and improve product production efficiency.

[0006] The purpose of this utility model is achieved through the following technical solutions:

[0007] A side point glue inlet flow channel structure of a three-plate mold, comprising:

[0008] A front mold core, wherein the front mold core is provided with a runner group, one end of the runner group is connected to the main runner; and an upper surface molding groove is provided on the bottom surface of the front mold core;

[0009] A rear mold core, wherein the top surface of the rear mold core is provided with a lower surface molding groove, and when the front mold core and the rear mold core are molded together, the upper surface molding groove and the lower surface molding groove together form a strap molding filling cavity, and a plurality of heat dissipation hole molding convex mold parts are spaced apart in the strap molding filling cavity, and a plurality of heat dissipation holes are formed by the plurality of heat dissipation hole molding convex mold parts, and at least one of the heat dissipation hole molding convex mold parts is provided with a first side point gate and a second side point gate respectively connected to the other end of the runner group on both sides, and the other end of the runner group is connected to the strap molding filling cavity through the first side point gate and the second side point gate.

[0010] In one embodiment, the runner group includes a first runner groove, a second runner groove and a gate runner connected in sequence; one end of the first runner groove away from the second runner groove is connected to the main runner, the first runner groove and the second runner groove are located on the top surface of the front mold core, and one end of the gate runner away from the second runner groove is connected to the first side point gate and the second side point gate.

[0011] In one embodiment, the cross-sectional shapes of the first runner groove and the second runner groove are both semicircular, rectangular, trapezoidal or U-shaped.

[0012] In one embodiment, the plurality of heat dissipation hole forming convex mold parts include a plurality of first forming protrusions and a plurality of second forming protrusions; the plurality of first forming protrusions are located at the bottom of the upper surface forming groove, and the plurality of second forming protrusions are located at the bottom of the lower surface forming groove, and the plurality of first forming protrusions and the plurality of second forming protrusions are aligned one by one.

[0013] In one embodiment, at least one of the first molding protrusions has an end surface provided with a runner nozzle connected to the gate runner, and two sides of the runner nozzle are respectively provided with a first side point-injection notch and a second side point-injection notch connected to the runner nozzle;

[0014] A third side glue point injection notch and a fourth side glue point injection notch are provided on both sides of the end face of at least one of the second molding protrusions. When the front mold core and the rear mold core are molded together, the first side glue point injection notch and the third side glue point injection notch together form the first side point gate; the second side glue point injection notch and the fourth side glue point injection notch together form the second side point gate.

[0015] In one embodiment, the gap length of the third side point glue injection gap is greater than the gap length of the first side point glue injection gap, and the gap length of the fourth side point glue injection gap is greater than the gap length of the second side point gate.

[0016] In one of the embodiments, a cold material well is formed on the end surface of at least one of the second molding protrusions, and the cold material well is connected to and aligned with the runner nozzle.

[0017] In one embodiment, a cold material runner groove is provided at the end of the second branch runner groove communicating with the gate runner.

[0018] In one embodiment, the cross-section of the gate runner is circular, and the gate runner is convergent at a position adjacent to the runner nozzle.

[0019] A three-plate mold, comprising a detachably connected fixed mold base plate, a sprue plate and a side point glue inlet flow channel structure of the three-plate mold described in any one of the above items;

[0020] The three-plate mold further includes a fixed mold plate, a movable mold mechanism, a nozzle insert and a nozzle hook, wherein the nozzle insert is located between the nozzle plate and the fixed mold plate, the front mold core is detachably mounted on the fixed mold plate, and the bottom surface of the nozzle insert abuts against the top surface of the fixed mold plate; the rear mold core is detachably mounted on the movable mold mechanism;

[0021] One end of the sprue hook part is detachably mounted on the fixed mold base plate, and the other end of the sprue hook part is sequentially penetrated through the fixed mold base plate, the sprue plate and the sprue insert to the gate runner.

[0022] Compared with the prior art, the utility model has at least the following advantages:

[0023] Since the heat dissipation hole forming convex part is the mold core part for forming the heat dissipation hole, and the first side point gate and the second side point gate are respectively arranged on both sides of the heat dissipation hole forming convex part, that is, the injection molding glue inlet position of the strap is hidden in the inner wall of the heat dissipation hole, so that the product appearance surface of the strap can be avoided to the greatest extent, and the aesthetic appearance of the product appearance surface is effectively ensured. Among them, by using the mold opening structure of the three-plate mold, the sprue located in the main channel and the branch channel group can be reliably demolded through the sprue plate of the three-plate mold, so that the glue inlet located in the first side point gate and the second side point gate is automatically sheared and pulled off when the mold is opened, without the need for subsequent process punching, which effectively reduces the production cycle of the product, and can improve the injection molding production efficiency of the product while ensuring the integrity of the product appearance. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 It is a schematic diagram of the structure explosion of the front mold core and the rear mold core of the side point glue inlet flow channel structure of a three-plate mold in an implementation;

[0026] Figure 2 for Figure 1 The schematic diagram of the partial enlarged structure of the side point glue inlet flow channel structure of the three-plate mold shown in FIG.

[0027] Figure 3 for Figure 1 A schematic diagram of the partial structure of the front mold core of the side point glue inlet flow channel structure of the three-plate mold shown;

[0028] Figure 4 for Figure 1 A cross-sectional view of the side point glue inlet flow channel structure of the three-plate mold shown;

[0029] Figure 5 for Figure 1 A partial cross-sectional view of the side point glue inlet flow channel structure of the three-plate mold shown;

[0030] Figure 6 A top view of a three-plate mold in another embodiment;

[0031] Figure 7 for Figure 6 BB section of the three-plate mould shown. DETAILED DESCRIPTION

[0032] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively with reference to the relevant drawings. The drawings provide preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly and comprehensively understood.

[0033] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0035] See also Figures 1 to 5 In order to better understand the side point glue inlet flow channel structure 10 of the three-plate mold of the present application, the side point glue inlet flow channel structure 10 of the three-plate mold is further explained as follows:

[0036] The side point glue flow channel structure 10 of the three-plate mold of one embodiment includes a front mold core 100 and a rear mold core 200, wherein the front mold core 100 is provided with a branch flow channel group 110, and one end of the branch flow channel group 110 is connected to the main flow channel (not shown); the bottom surface of the front mold core 100 is provided with an upper surface molding groove 101; the top surface of the rear mold core 200 is provided with a lower surface molding groove 201. When the front mold core 100 and the rear mold core 200 are molded together, the upper surface molding groove 101 and the lower surface molding groove 201 together form a watch band. The watchband molding filling cavity 202 has a plurality of heat dissipation hole molding punch parts 130 spaced apart in the said watchband molding filling cavity 202, and a plurality of heat dissipation holes are molded by the said plurality of heat dissipation hole molding punch parts 130, and at least one of the said heat dissipation hole molding punch parts 130 has a first side point gate 1301 and a second side point gate 1302 respectively connected to the other end of the said branch channel group 110 on both sides, and the other end of the said branch channel group 110 is connected to the watchband molding filling cavity 202 through the said first side point gate 1301 and the said second side point gate 1302.

[0037] In this embodiment, since the heat dissipation hole forming convex part 130 is the mold core part for forming the heat dissipation hole, and the first side point gate 1301 and the second side point gate 1302 are respectively arranged on both sides of the heat dissipation hole forming convex part 130, that is, the injection molding glue inlet position of the watchband is hidden in the inner wall of the heat dissipation hole, so that the product appearance surface of the watchband can be avoided to the greatest extent, and the aesthetics of the product appearance surface can be effectively ensured. Among them, by using the mold opening structure of the three-plate mold, the sprue located in the main channel (not shown) and the branch channel group 110 can be reliably demolded through the sprue plate 400 of the three-plate mold, so that the glue inlet located in the first side point gate 1301 and the second side point gate 1302 is automatically sheared and pulled off when the mold is opened, without the need for subsequent process punching, which effectively reduces the production cycle of the product, and can improve the injection molding production efficiency of the product while ensuring the integrity of the product appearance.

[0038] like Figures 1 to 5As shown, in one embodiment, the runner group 110 includes a first runner groove 1101, a second runner groove 1102 and a gate runner 1103 that are connected in sequence; the end of the first runner groove 1101 away from the second runner groove 1102 is connected to the main channel (not shown), the first runner groove 1101 and the second runner groove 1102 are located on the top surface of the front mold core 100, and the end of the gate runner 1103 away from the second runner groove 1102 is connected to the first side point gate 1301 and the second side point gate 1302. In one embodiment, the cross-sectional shapes of the first runner groove 1101 and the second runner groove 1102 are both semicircular, rectangular, trapezoidal or U-shaped.

[0039] It can be understood that in the present embodiment, the cross-sectional shape of the first branch runner groove 1101 and the second branch runner groove 1102 is U-shaped. Specifically, the inner wall roughness of the first branch runner groove 1101, the second branch runner groove 1102 and the gate runner 1103 is 0.8 μm, so as to effectively reduce the resistance of the molten plastic liquid injected from the main channel (not shown) to flow through the first branch runner groove 1101, the second branch runner groove 1102 and the gate runner 1103, thereby improving the flow rate of the molten plastic liquid.

[0040] like Figures 1 to 5 As shown, in one embodiment, the multiple heat dissipation hole forming convex mold parts 130 include multiple first forming protrusions 120 and multiple second forming protrusions 210; the multiple first forming protrusions 120 are located at the bottom of the upper surface forming groove 101, and the multiple second forming protrusions 210 are located at the bottom of the lower surface forming groove 201, and the multiple first forming protrusions 120 and the multiple second forming protrusions 210 are aligned one by one.

[0041] In one embodiment, at least one of the first molding protrusions 120 has an end face provided with a runner gate 1201 connected to the gate runner 1103, and the runner gate 1201 has two sides provided with a first side point glue notch 1202 and a second side point glue notch 1203 connected to the runner gate 1201 respectively; at least one of the second molding protrusions 210 has two sides provided with a third side point glue notch 2101 and a fourth side point glue notch 2102, and when the front mold core 100 and the rear mold core 200 are molded together, the first side point glue notch 1202 and the third side point glue notch 2101 together form the first side point gate 1301; the second side point glue notch 1203 and the fourth side point glue notch 2102 together form the second side point gate 1302.

[0042] It can be understood that when the front mold core 100 and the rear mold core 200 are molded together, the end faces of the plurality of first molding protrusions 120 are aligned and abutted against the end faces of the plurality of second molding protrusions 210 one by one, and the abutting end faces form a reliable sealing position. After the end face of one of the first molding protrusions 120 is abutted against the end face of the other aligned second molding protrusion 210, the formed first side point gate 1301 and the second side point gate 1302 are respectively connected to the strap molding filling cavity 202; specifically, the apertures of the first side point gate 1301 and the second side point gate 1302 are less than 1.2 mm, so that the first side point gate 1301 and the second side point gate 1302 effectively optimize and reduce the aperture size without affecting the molding effect of the molten plastic liquid injected into the strap molding filling cavity 202; at the same time, in order to ensure that the molding water outlets at the first side point gate 1301 and the second side point gate 1302 are easy to automatically shear and break during the subsequent mold opening, thereby reducing the production cycle of the product.

[0043] It should be noted that, in this embodiment, part of the second molding protrusion 210 will be made into a molding insert of the rear mold core 200 (not shown), and at the same time, an insert hole (such as Figure 2 As shown), so that the molding insert (not shown) and the rear mold core 200 can be detachably installed; specifically, the molding insert (not shown) and the insert hole (such as Figure 2 An exhaust groove (not shown) is set in the assembly gap of the watch strap molding filling cavity 202 to effectively improve the exhaust of the watch strap molding filling cavity 202 during the injection molding filling stage, thereby ensuring the molding quality of the injection molded product.

[0044] like Figure 2 , Figure 3 and Figure 5 As shown, in one embodiment, the gap length of the third side point glue inlet gap 2101 is greater than the gap length of the first side point glue inlet gap 1202, and the gap length of the fourth side point glue inlet gap 2102 is greater than the gap length of the second side point gate 1302. It can be understood that when the mold is opened, the glue inlet at the first side point gate 1301 is mainly attached to the inner wall of the third side point glue inlet gap 2101; similarly, the glue inlet at the second side point gate 1302 is mainly attached to the inner wall of the fourth side point glue inlet gap 2102, so that the glue inlet at the first side point gate 1301 and the glue inlet at the second side point gate 1302 respectively form a shear force with the water inlet body in the gate runner 1103, thereby ensuring that the glue inlet is automatically sheared and pulled off when the mold is opened, effectively reducing the production cycle of the product.

[0045] like Figure 4 and Figure 5As shown, in one embodiment, at least one end surface of the second molding protrusion 210 is also provided with a cold material well 2103, and the cold material well 2103 is connected to the runner nozzle 1201 and is aligned. In one embodiment, the cross section of the gate runner 1103 is circular, and the position of the gate runner 1103 adjacent to the runner nozzle 1201 is in a contracted shape. It can be understood that the position of the gate runner 1103 adjacent to the runner nozzle 1201 is in a contracted shape, so as to further increase the injection pressure of the molten plastic liquid flowing through the runner nozzle 1201; at the same time, the cold material at the front end of the molten plastic liquid (i.e., the molten plastic liquid first filled into the main channel, the first branch runner groove 1101, the second branch runner groove 1102 and the front end of the gate runner 1103) is filled into the cold material well 2103, ensuring that the subsequent molten plastic liquid can maintain a good injection temperature to complete the injection filling.

[0046] See also Figure 2 , Figure 4 , Figure 6 and Figure 7 , the present application also provides a three-plate mold 20, comprising a detachably connected fixed mold base plate 300 and a sprue plate 400 and a side point glue inlet flow channel structure 10 of the three-plate mold described in any of the above embodiments;

[0047] The three-plate mold 20 also includes a fixed mold plate 500, a movable mold mechanism 600, a sprue insert 700 and a sprue hook needle 800, wherein the sprue insert 700 is located between the sprue plate 400 and the fixed mold plate 500, the front mold core 100 is detachably mounted on the fixed mold plate 500, and the bottom surface of the sprue insert 700 abuts against the top surface of the fixed mold plate 500; the rear mold core 200 is detachably mounted on the movable mold mechanism 600; one end of the sprue hook needle 800 is detachably mounted on the fixed mold base plate 300, and the other end of the sprue hook needle 800 is sequentially penetrated through the fixed mold base plate 300, the sprue plate 400 and the sprue insert 700 to the gate runner 1103.

[0048] In this embodiment, the mold is opened by moving the movable mold mechanism 600, so that the rear mold core 200 moves along with one side of the movable mold mechanism 600, and the product adheres to the lower surface of the rear mold core 200 to form the groove 201; when the pull rod (not shown) of the movable mold mechanism 600 drives the fixed mold fixing plate 500 away from the gate plate 400, the gate insert 700 and the gate hook 800, the other end of the gate hook 800 hooks the gate body located in the gate flow channel 1103, so that the gate body is hung on the other end of the gate hook 800 to complete the gate demoulding. The three-plate mold 20 realizes the automatic demoulding of the gate, effectively reducing the production cycle of the product.

[0049] Compared with the prior art, the utility model has at least the following advantages:

[0050] Since the heat dissipation hole forming convex part is the mold core part for forming the heat dissipation hole, and the first side point gate and the second side point gate are respectively arranged on both sides of the heat dissipation hole forming convex part, that is, the injection molding glue inlet position of the strap is hidden in the inner wall of the heat dissipation hole, so that the product appearance surface of the strap can be avoided to the greatest extent, and the aesthetic appearance of the product appearance surface is effectively ensured. Among them, by using the mold opening structure of the three-plate mold, the sprue located in the main channel and the branch channel group can be reliably demolded through the sprue plate of the three-plate mold, so that the glue inlet located in the first side point gate and the second side point gate is automatically sheared and pulled off when the mold is opened, without the need for subsequent process punching, which effectively reduces the production cycle of the product, and can improve the injection molding production efficiency of the product while ensuring the integrity of the product appearance.

[0051] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A side point glue inlet flow channel structure of a three-plate mold, characterized in that: include A front mold core, wherein the front mold core is provided with a runner group, one end of the runner group is connected to the main runner; and an upper surface molding groove is provided on the bottom surface of the front mold core; A rear mold core, wherein the top surface of the rear mold core is provided with a lower surface molding groove, and when the front mold core and the rear mold core are molded together, the upper surface molding groove and the lower surface molding groove together form a strap molding filling cavity, and a plurality of heat dissipation hole molding convex mold parts are spaced apart in the strap molding filling cavity, and a plurality of heat dissipation holes are formed by the plurality of heat dissipation hole molding convex mold parts, and at least one of the heat dissipation hole molding convex mold parts is provided with a first side point gate and a second side point gate respectively connected to the other end of the runner group on both sides, and the other end of the runner group is connected to the strap molding filling cavity through the first side point gate and the second side point gate.

2. The side point glue inlet flow channel structure of the three-plate mold according to claim 1 is characterized in that: The runner group includes a first runner groove, a second runner groove and a gate runner which are connected in sequence; one end of the first runner groove away from the second runner groove is connected to the main runner, the first runner groove and the second runner groove are located on the top surface of the front mold core, and one end of the gate runner away from the second runner groove is connected to the first side point gate and the second side point gate.

3. The side point glue inlet flow channel structure of the three-plate mold according to claim 2 is characterized in that: The cross-sectional shapes of the first branch runner groove and the second branch runner groove are both semicircular, rectangular, trapezoidal or U-shaped.

4. The side point glue inlet flow channel structure of the three-plate mold according to claim 2 is characterized in that: The multiple heat dissipation hole forming convex mold parts include multiple first forming convex parts and multiple second forming convex parts; the multiple first forming convex parts are located at the bottom of the upper surface forming groove, and the multiple second forming convex parts are located at the bottom of the lower surface forming groove, and the multiple first forming convex parts and the multiple second forming convex parts are aligned one by one.

5. The side point glue inlet flow channel structure of the three-plate mold according to claim 4 is characterized in that: A runner injection port connected to the gate runner is formed on the end surface of at least one of the first molding protrusions, and a first side point injection notch and a second side point injection notch connected to the runner injection port are respectively formed on both sides of the runner injection port; A third side glue point injection notch and a fourth side glue point injection notch are provided on both sides of the end face of at least one of the second molding protrusions. When the front mold core and the rear mold core are molded together, the first side glue point injection notch and the third side glue point injection notch together form the first side point gate; the second side glue point injection notch and the fourth side glue point injection notch together form the second side point gate.

6. The side point glue inlet flow channel structure of the three-plate mold according to claim 5 is characterized in that: The gap length of the third side point glue injection gap is greater than the gap length of the first side point glue injection gap, and the gap length of the fourth side point glue injection gap is greater than the gap length of the second side point gate.

7. The side point glue inlet flow channel structure of the three-plate mold according to claim 5 is characterized in that: A cold material well is also formed on the end surface of at least one of the second molding protrusions, and the cold material well is connected to and aligned with the runner nozzle.

8. The side point glue inlet flow channel structure of the three-plate mold according to claim 2 is characterized in that: A cold material runner groove is provided at the end of the second branch runner groove communicating with the gate runner.

9. The side point glue inlet flow channel structure of the three-plate mold according to claim 5, characterized in that: The cross section of the gate runner is circular, and the position of the gate runner adjacent to the runner nozzle is contracted.

10. A three-plate mold, characterized in that: It comprises a detachably connected fixed mold base plate, a nozzle plate and a side point glue inlet flow channel structure of a three-plate mold as described in any one of claims 1 to 9; The three-plate mold further includes a fixed mold plate, a movable mold mechanism, a nozzle insert and a nozzle hook, wherein the nozzle insert is located between the nozzle plate and the fixed mold plate, the front mold core is detachably mounted on the fixed mold plate, and the bottom surface of the nozzle insert abuts against the top surface of the fixed mold plate; the rear mold core is detachably mounted on the movable mold mechanism; One end of the sprue hook part is detachably mounted on the fixed mold base plate, and the other end of the sprue hook part is sequentially penetrated through the fixed mold base plate, the sprue plate and the sprue insert to the gate runner.

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