In-mold hot cutting forming mold

Abstract

The utility model provides an in-mold hot cutting forming mold which comprises a front mold and a rear mold, and the front mold comprises a front mold core provided with a convex part; the rear mold comprises a rear mold core provided with a concave part, a guide block and a first side wall, a cavity and a runner which are communicated with each other are formed between the convex part and the concave part, a cutter channel is formed between the guide block and the first side wall, and the joint of the cavity and the runner is communicated with the cutter channel; a hot cutting assembly is arranged in the rear mold and comprises a cutter, a cutter mounting seat, an ejector rod and a driving device, the first end of the cutter is arranged on the cutter mounting seat, the second end of the cutter is arranged in the cutter channel, and grooves are formed in the two sides, facing and backing on to the guide block, of the second end of the cutter; the ejector rod extends in the extending direction of the cutter channel and is connected with the cutter mounting seat, the driving end of the driving device is connected with the ejector rod, and the driving device drives the cutter to move in the cutter channel through the ejector rod; the utility model can ensure the smooth movement of the cutter and avoid the residual of fine waste on the outer surface of the product.

Description

Technical Field

[0001] The utility model relates to the field of injection molds, in particular to an in-mold hot-cutting molding mold. Background Art

[0002] After injection molding, plastic products usually have sprue material on them. Currently, sprue cutting is usually done manually, but manual sprue cutting has the following problems: 1) workers are easily fatigued and work efficiency is low; 2) manual sprue cutting has large differences and is easy to scratch the product, making it difficult to control product quality.

[0003] Although there are molds with hot cutting components inside in the prior art, the cutter will generate fine waste in the process of cutting the sprue material. On the one hand, the fine waste will remain on the surface of the product, thereby affecting the smoothness of the product. On the other hand, it will be embedded between the cutter and the cutter channel, which will not only affect the smooth movement of the subsequent cutter, but in severe cases, it will also cause a fine gap between the cutter and the cutter channel, resulting in leakage during subsequent injection molding. Summary of the invention

[0004] The utility model aims to provide an in-mold hot cutting forming mold which can ensure the smooth movement of the cutting knife.

[0005] In order to achieve the above-mentioned purpose, the utility model provides an in-mold hot cutting forming mold, including a front mold and a rear mold, the front mold includes a front mold core, and the front mold core is provided with a convex portion; the rear mold includes a rear mold core, the rear mold core is arranged corresponding to the front mold core, and a concave portion is arranged on the rear mold core, and a connected cavity and a flow channel are formed between the convex portion and the concave portion, and a guide block and a first side wall are arranged on the rear mold core, and the guide block and the first side wall are arranged corresponding to each other and form a cutting channel, and the cutting channel extends along the mold opening direction, and the connection between the cavity and the flow channel and the cutting channel is connected. The rear mold is provided with a hot cutting assembly, which includes a cutter, a cutter mounting seat, a push rod and a driving device. The first end of the cutter is arranged on the cutter mounting seat, and the second end of the cutter is arranged in the cutter channel, and the second end of the cutter is provided with grooves on both sides thereof facing the guide block and the first side wall. The push rod extends along the extension direction of the cutter channel and is connected to the cutter mounting seat. The driving end of the driving device is connected to the push rod, and the driving device drives the cutter to move in the cutter channel through the push rod to enter or exit the connection between the cavity and the runner.

[0006] It can be seen from the above scheme that by arranging a hot cutting component in the rear mold, it is convenient to use a cutter to cut off the sprue material under the pressure holding state, so that the product and the sprue material can be separated in the mold, which is conducive to replacing the traditional manual post-processing operation of cutting off the sprue material, and has the advantages of saving manpower, improving work efficiency and ensuring product quality; by arranging grooves on both sides of the cutter, it is used to store fine waste during the cutting process, which not only avoids the adverse effects of fine waste on the movement of the cutter and the smoothness of the product, but also avoids subsequent leakage.

[0007] A further solution is that at least two grooves are arranged on the same side of the cutter, all the grooves are arranged along the moving direction of the cutter, and the grooves extend in a direction perpendicular to the moving direction.

[0008] A further solution is that the four side walls of the second end of the cutter are respectively fitted with the corresponding side walls of the cutter channel.

[0009] It can be seen from the above scheme that by arranging the side wall of the cutter to fit the side wall of the cutter channel, there is no gap between the matching surfaces of the cutter, the guide block and the rear mold core, which is conducive to avoiding material leakage.

[0010] A further solution is that a first inclined surface and a second inclined surface are respectively provided on both sides of the cutter facing the guide block and the first side wall, the first inclined surface is in contact with the side wall of the guide block, and the second inclined surface is in contact with the first side wall.

[0011] A further solution is that a guide groove is provided on the guide block, the guide groove is connected to the cutter channel, the guide groove includes three side groove walls, and a sharp corner that matches the corner of the cutter is formed between adjacent two side groove walls.

[0012] A further solution is that the number of the hot-cut components is set to be a plurality.

[0013] A further solution is that the driving device is an oil cylinder or a gas cylinder.

[0014] A further solution is that the rear mold also includes a rear mold frame, an ejector plate, an ejector pad and a bottom plate, the rear mold core is arranged on the rear mold frame, the rear mold frame, the ejector plate, the ejector pad and the bottom plate are arranged in sequence along the mold opening direction, the cutter mounting seat is arranged between the rear mold core and the rear mold frame, the driving device is arranged between the ejector pad and the bottom plate, and the ejector rod passes through the rear mold frame, the ejector plate and the ejector pad in sequence to be connected to the driving device.

[0015] A further solution is that a V-shaped groove is provided on the raised portion on a side facing the recessed portion, a V-shaped protrusion is provided on the recessed portion corresponding to the V-shaped groove, and a V-shaped cavity connected to the mold cavity is formed between the V-shaped groove and the V-shaped protrusion. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1It is a sectional view of the hot cutting component in the embodiment of the utility model.

[0017] Figure 2 yes Figure 1 Enlarged view of point A in the middle.

[0018] Figure 3 yes Figure 1 Enlarged view of point B in the middle.

[0019] Figure 4 It is a cross-sectional view of the glue inlet in the embodiment of the utility model.

[0020] Figure 5 It is a structural diagram of the rear mold in the embodiment of the utility model.

[0021] Figure 6 It is a structural diagram of the hot cutting component in the embodiment of the utility model.

[0022] Figure 7 It is an exploded view of the guide block and the cutter in the embodiment of the utility model.

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0024] See also Figures 1 to 4 The present embodiment provides an in-mold hot cutting forming mold, which includes a front mold 1 and a rear mold 2.

[0025] The front mold 1 includes a top plate 11, a front mold frame 12 and a front mold core 13. The front mold core 13 is arranged on the front mold frame 12. The front mold core 13 is provided with a protrusion 131 protruding downward. A V-shaped groove 1311 is provided on one side of the protrusion 131, and the V-shaped groove 1311 has a notch opening facing downward.

[0026] The rear mold 2 includes a rear mold core 21, a rear mold frame 22, an ejector plate 23, an ejector pad 24, a bottom plate 25 and two mold feet 26. The rear mold core 21 is arranged on the rear mold frame 22, and the rear mold core 21 and the front mold core 13 are arranged correspondingly up and down. A recessed portion 211 is arranged on the rear mold core 21, and the raised portion 131 is arranged in cooperation with the recessed portion 211 to form a connected mold cavity 3 and a flow channel 4 therebetween. The recessed portion 211 is provided with a V-shaped protrusion 2111 on the side away from the flow channel 4, and the V-shaped protrusion 2111 is arranged correspondingly with the V-shaped groove 1311 to form a V-shaped cavity, which is connected to the mold cavity 3.

[0027] In this embodiment, the number of cavities 3 is set to two, and the flow channel 4 is connected between the two cavities 3. In this embodiment, two products 7 can be molded at one time, and the sprue material 6 is connected between the two products 7. A glue inlet flow channel 14 is provided in the front mold 1, and one end of the glue inlet flow channel 14 is connected to the flow channel 4.

[0028] The hot cutting assembly 5 is arranged in the rear mold 2, and the guide block 27 and the first side wall 212 are arranged on the rear mold core 21. The guide block 27 is arranged below the flow channel 4, and the first side wall 212 is adjacent to the guide block 27. A cutter channel 28 is formed between the guide block 27 and the first side wall 212, and the connection between the cavity 3 and the flow channel 4 is connected to the cutter channel 28. In this embodiment, the cutter channel 28 extends along the mold opening direction, and the width of the upper part of the cutter channel 28 is smaller than the width of the lower part thereof, so that the upper part of the cutter 51 is more tightly connected to the upper part of the cutter channel 28.

[0029] The hot cutting assembly 5 includes a cutter 51, a cutter mounting seat 52, a push rod 53 and a driving device 54. The first end of the cutter 51 is arranged on the cutter mounting seat 52, and the second end of the cutter 51 is arranged in the cutter channel 28. The push rod 53 extends along the extension direction of the cutter channel 28 and is connected to the cutter mounting seat 52. The driving end of the driving device 54 is connected to the push rod 53. The driving device 54 drives the cutter 51 to move up and down in the cutter channel 28 through the push rod 53, so that the blade of the cutter 51 enters or exits the connection between the cavity 3 and the runner 4. The driving device 54 is preferably an oil cylinder or an air cylinder. During the injection molding process, the blade of the cutter 51 retracts into the cutter channel 28. After the injection molding is completed and before the mold is opened, the driving device 54 drives the cutter 51 to move upward and cuts off the sprue material 6 from the connection between the product 7 and the sprue material 6 to separate the two.

[0030] The rear mold frame 22, the ejector plate 23, the ejector pad 24 and the bottom plate 25 are arranged in sequence along the mold opening direction, and the mold foot 26 is connected between the rear mold frame 22 and the bottom plate 25. The cutter mounting seat 52 is arranged between the rear mold core 21 and the rear mold frame 22, and the driving device 54 is arranged between the ejector pad 24 and the bottom plate 25. Preferably, the driving device 54 is fixedly connected to the bottom plate 25 by bolts, and the ejector rod 53 passes through the rear mold frame 22, the ejector plate 23 and the ejector pad 24 and is connected to the driving device 54.

[0031] See also Figures 4 to 7 , and combined with Figure 2 The number of the hot cutting components 5 is set to be several. In this embodiment, the number of the hot cutting components 5 is set to four. The four hot cutting components 5 are respectively arranged corresponding to the four connection points between the product 7 and the flow channel 4. The rear mold core 21 is provided with a guide block 27 and a cutter channel 28 corresponding to each hot cutting component 5.

[0032] The second end of the cutter 51 is provided with grooves 511 on both sides thereof facing the guide block 27 and the first side wall 212, and the grooves 511 are used to store fine waste generated during cutting. Specifically, at least two grooves 511 are provided on the same side of the cutter 51, and all the grooves 511 are arranged along the moving direction of the cutter 51, and the grooves 511 extend in a direction perpendicular to the moving direction thereof.

[0033] In order to avoid material leakage during the injection molding process, the four side walls of the second end of the cutter 51 are respectively fitted with the corresponding side walls of the cutter channel 28, so that the cutter 51 moves along the side walls of the cutter channel 28 to avoid a gap between the cutter 51 and the cutter channel 28. Specifically: the cutter 51 is provided with a first inclined surface 512 and a second inclined surface 513 on both sides facing the guide block 27 and the first side wall 212, respectively, and the groove 511 is provided on the first inclined surface 512 and the second inclined surface 513. The closer the first inclined surface 512 is to the runner 4, the closer it is to the guide block 27, so that the first inclined surface 512 fits with the side wall of the guide block 27, and the closer the second inclined surface 513 is to the cavity 3, the closer it is to the corresponding side wall of the rear mold core 21, so that the second inclined surface 513 fits with the side wall of the rear mold core 21.

[0034] exist Figure 7 In the embodiment, a guide groove 271 is provided on the guide block 27, and the guide groove 271 is connected to the cutter channel 28, and the second end of the cutter 51 can move up and down in the guide groove 271. Specifically: the guide groove 271 includes three side groove walls, and a sharp corner 2711 that matches the corner of the cutter 51 is formed between the adjacent two side groove walls. The sharp corner 2711 of this embodiment is relative to the rounded corner, that is, the connection between the two side sides forming the sharp corner 2711 is a straight line, not an arc surface. When the cutter 51 is in the guide groove 271, the three side groove walls of the guide groove 271 are all in contact with the corresponding side walls of the cutter 51, and the corner of the cutter 51 just fits tightly with the sharp corner 2711 of the guide groove 271 without leaving any gap. Generally speaking, since wire cutting will form rounded corners, the guide groove 271 cannot be processed by wire cutting, and needs to be processed by a grinder.

[0035] In summary, the utility model arranges a hot cutting component in the rear mold, which is convenient for cutting the nozzle material with a cutter under pressure holding state, so that the product and the nozzle material can be separated in the mold, which is conducive to replacing the traditional manual post-processing operation of cutting off the nozzle material, and has the advantages of saving manpower, improving work efficiency and ensuring product quality; by arranging grooves on both sides of the cutter, it is used to store fine waste during the cutting process, which not only avoids the adverse effects of the fine waste on the movement of the cutter and the smoothness of the product, but also avoids subsequent leakage.

[0036] Finally, it should be emphasized that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various changes and modifications. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An in-mold hot cutting forming mold, comprising a front mold and a rear mold, characterized in that: The front mold comprises a front mold core, and a convex portion is arranged on the front mold core; The rear mold includes a rear mold core, the rear mold core is arranged corresponding to the front mold core, a recessed portion is arranged on the rear mold core, a connected cavity and a flow channel are formed between the raised portion and the recessed portion, a guide block and a first side wall are arranged on the rear mold core, the guide block and the first side wall are arranged corresponding to each other and form a cutter channel, the cutter channel extends along the mold opening direction, and the connection between the cavity and the flow channel is connected to the cutter channel; A hot cutting assembly is arranged in the rear mold, and the hot cutting assembly includes a cutter, a cutter mounting seat, a push rod and a driving device. The first end of the cutter is arranged on the cutter mounting seat, and the second end of the cutter is arranged in the cutter channel, and the second end of the cutter is provided with grooves on both sides thereof facing the guide block and the first side wall. The push rod extends along the extension direction of the cutter channel and is connected to the cutter mounting seat. The driving end of the driving device is connected to the push rod, and the driving device drives the cutter to move in the cutter channel through the push rod to enter or exit the connection between the cavity and the runner.

2. The in-mold hot cutting forming mold according to claim 1, characterized in that: At least two grooves are arranged on the same side of the cutter, all the grooves are arranged along the moving direction of the cutter, and the grooves extend in a direction perpendicular to the moving direction.

3. The in-mold hot cutting forming mold according to claim 1, characterized in that: The four side walls of the second end of the cutter are respectively fitted with the corresponding side walls of the cutter channel.

4. The in-mold hot cutting forming mold according to claim 3, characterized in that: A first inclined surface and a second inclined surface are respectively provided on both sides of the cutter facing the guide block and the first side wall. The first inclined surface is in contact with the side wall of the guide block, and the second inclined surface is in contact with the first side wall.

5. The in-mold hot cutting forming mold according to claim 3, characterized in that: The guide block is provided with a guide groove, the guide groove is communicated with the cutter channel, the guide groove comprises three side groove walls, and a sharp corner matching with the corner of the cutter is formed between the groove walls on two adjacent sides.

6. The in-mold hot cutting forming mold according to any one of claims 1 to 5, characterized in that: The number of the hot cutting components is set to be several.

7. The in-mold hot cutting forming mold according to any one of claims 1 to 5, characterized in that: The driving device is an oil cylinder or a gas cylinder.

8. The in-mold hot cutting forming mold according to any one of claims 1 to 5, characterized in that: The rear mold also includes a rear mold frame, an ejector plate, an ejector pad and a bottom plate, the rear mold core is arranged on the rear mold frame, the rear mold frame, the ejector plate, the ejector pad and the bottom plate are arranged in sequence along the mold opening direction, the cutter mounting seat is arranged between the rear mold core and the rear mold frame, the driving device is arranged between the ejector pad and the bottom plate, and the ejector rod passes through the rear mold frame, the ejector plate and the ejector pad in sequence and is connected to the driving device.

9. The in-mold hot cutting forming mold according to any one of claims 1 to 5, characterized in that: The raised portion is provided with a V-shaped groove on one side facing the recessed portion, the recessed portion is provided with a V-shaped protrusion corresponding to the V-shaped groove, and a V-shaped cavity connected to the cavity is formed between the V-shaped groove and the V-shaped protrusion.

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