CN215472725U

CN215472725U - In-mold cutting device and injection mold thereof

Info

Publication number: CN215472725U
Application number: CN202121093336.9U
Authority: CN
Inventors: 陈强光
Original assignee: Shenzhen Baoxinchuang Technology Co Ltd
Current assignee: Shenzhen Baoxinchuang Information Technology Co.,Ltd.
Priority date: 2021-05-20
Filing date: 2021-05-20
Publication date: 2022-01-11
Anticipated expiration: 2031-05-20

Abstract

The embodiment of the utility model relates to the technical field of mold internal cutting tools, and discloses an in-mold cutting device and an injection mold thereof. This mould internal cutting device includes: the sliding block is used for mounting an inner cutting tool; an inner cutter, the inner cutter comprising: the cutting knife can move in a reciprocating manner, is of a template structure and is used for cutting off the nozzle material; the cutter comprises a cutter edge, a cutter head and a cutter handle; the knife edge is positioned at one end of the cutter, the cutter handle is arranged at one end away from the knife edge, and the cutter head is connected between the knife edge and the cutter handle; the knife edge is provided with an inclined plane; the thickness of the tool bit is smaller than that of the tool handle. Through installing mould cutting device in injection mold, can make mouth of a river material and product separate before injection mold opens the mould, save extra excision mouth of a river material operation, obtain the smooth product of fracture, save manufacturing cost, improve production efficiency.

Description

In-mold cutting device and injection mold thereof

Technical Field

The utility model relates to the technical field of die internal cutting tools, in particular to an internal cutting device and an injection die thereof.

Background

At present, the housings of most electronic products, such as tablet computers, notebook computers, desktop computers, etc., are formed by injection molding. In an injection mold, in order to allow raw materials (usually resin) to enter a mold cavity to be molded into a product, a front mold of the injection mold is usually provided with a water path connecting a feed port and the product mold cavity. The raw materials are heated at high temperature to be in a molten state, high pressure is applied to the raw materials, the raw materials are injected into the die cavity from the feed inlet of the front die through a water path, and the raw materials are subjected to pressure maintaining, cooling and forming in the die cavity for a period of time to form a product. Meanwhile, the residual raw material in the waterway is cooled and formed into a nozzle material which is connected with the product into a whole, so that the nozzle material and the product are required to be separated.

The common method for separating the nozzle material from the product in the prior art comprises the following steps: manual cutting and CNC machining. Long-term production practice shows that manual cutting is low in working efficiency, defective products are prone to occurring, and certain potential safety hazards exist for workers; CNC processing needs to make the tool corresponding to the structure of the product again, and production cost and related expenses are increased to a great extent.

SUMMERY OF THE UTILITY MODEL

Therefore, it is necessary to provide an in-mold cutting device for separating the nozzle material and the product before opening the mold, so as to eliminate the operation of cutting off the nozzle material.

In order to solve the above technical problem, one technical solution adopted by the embodiment of the present invention is:

an in-mold cutting device comprising: the sliding block is used for mounting an inner cutting tool; an inner cutter, the inner cutter comprising: the cutting knife can move in a reciprocating manner, is of a template structure and is used for cutting off the nozzle material; the cutter comprises a cutter edge, a cutter head and a cutter handle; the knife edge is positioned at one end of the cutter, the cutter handle is arranged at one end away from the knife edge, and the cutter head is connected between the knife edge and the cutter handle; the knife edge is provided with an inclined plane; the thickness of the tool bit is smaller than that of the tool handle.

In one embodiment, the inner cutter further comprises a cutter cover plate; the cutter cover plate is provided with a limiting step for limiting the maximum moving distance of the cutter; the cutter cover plate is arranged on the sliding block and fixedly connected with the sliding block.

In one embodiment, the inner cutter further comprises a cutter platen; the cutter pressing plate is fixedly connected with the cutter cover plate; the cutter pressing plate is located between the cutter cover plate and the cutter head of the cutter.

In one embodiment, the tool shank is provided with a first boss; the inner cutter also comprises a fixing device; the fixing device is positioned between the cutter cover plate and the sliding block; the fixing device is connected with the first boss of the cutter; at least one accommodating chamber is formed among the fixing device, the cutter and the sliding block.

In one embodiment, the fixing device comprises a fixing block and a stop block; the fixed block is provided with a second boss which is used for being embedded and connected with the first boss of the cutter; the fixed block and the stop block are fixedly connected to form a groove for accommodating the first boss of the cutter.

In one embodiment, the shank has at least one curved recess; the inner cutter further comprises at least one spring; the spring is arranged in the accommodating chamber, and the length of the spring is greater than or equal to the depth of the accommodating chamber; the spring is used for enabling the cutter to automatically reset and buffering the impact load of the cutter.

In one embodiment, the device further comprises an oil cylinder; the internal cutting tool also comprises an oil cylinder base, and the oil cylinder base is provided with at least one oil cylinder base hole for mounting the oil cylinder; the oil cylinder seat is positioned at one end of the sliding block and is connected with the sliding block.

An injection mold comprises a front mold and a rear mold, wherein the rear mold is provided with the mold inner cutting device; the die internal cutting device is arranged between the front die and the rear die.

In one embodiment, the front die is provided with a feeding hole and a first cavity; the feed inlet is used for injecting a forming raw material of the product; the end of the front die provided with the first cavity is in contact with the rear die.

In one embodiment, the rear mold is provided with a second cavity and an ejection structure; one end of the rear die provided with the second cavity is contacted with one end of the front die provided with the first cavity to form a die cavity for forming the product; the ejection structure is arranged at the bottom of the rear die and used for ejecting the product out of the second cavity.

The utility model has the beneficial effects that: an in-mold cutting device is provided, which includes a slider and an inner cutter. The inner cutter is arranged on the sliding block and can reciprocate relative to the sliding block to execute cutting-off operation; the inner cutting tool comprises a cutter which is of a template structure and can cut off the plate-shaped water gap material. Compared with the traditional method for cutting off the nozzle material, the in-mold cutting device can separate the nozzle material from the product before the mold is opened, so that the additional operation of cutting off the nozzle material is omitted, the problems of saw teeth and corner collapse at the position of a product fracture when the nozzle material is manually cut off are solved, the production stability and yield of the product are improved, and the production cost is saved.

Drawings

One or more embodiments are illustrated in drawings corresponding to, and not limiting to, the embodiments, in which elements having the same reference number designation may be represented as similar elements, unless specifically noted, the drawings in the figures are not to scale.

FIG. 1 is a schematic view of an injection mold according to an embodiment of the present invention;

FIG. 2 is an enlarged partial schematic view of FIG. 1 provided in accordance with an embodiment of the present invention;

fig. 3 is a schematic view of a cutter structure provided in an embodiment of the present invention.

Detailed Description

In order to facilitate an understanding of the utility model, the utility model is described in more detail below with reference to the accompanying drawings and specific examples. It is noted that when an element is referred to as being "secured to"/"mounted to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may be present. As used in this specification, the terms "upper," "lower," "inner," "outer," "vertical," "horizontal," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the utility model and simplicity in description, and do not indicate or imply that the referenced devices or elements must be in a particular orientation, constructed and operated in a particular orientation, and are not to be considered limiting of the utility model. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Furthermore, the technical features mentioned in the different embodiments of the utility model described below can be combined with each other as long as they do not conflict with each other.

As shown in fig. 1 to 3, the in-mold cutting device 11 includes: a slider 111 and an inner cutter.

Wherein the slider 111 is used for mounting an inner cutter.

The interior cutter includes: the cutting knife 112, the cutting knife 112 is a template structure, can reciprocate relative to the slide block 111, is used for cutting off the nozzle material A.

The cutter 112 is composed of a blade 1121, a cutter head 1122, and a shank 1123. The knife edge 1121 is located at one end of the cutting knife 112, the knife handle 1123 is located at the other end away from the knife edge 1121, and the cutter head 1122 is connected between the knife edge 1121 and the knife handle 1123. The knife edge 1121 is provided with an inclined plane; the thickness of tool tip 1122 is less than the thickness of tool shank 1123.

In some embodiments, as shown in fig. 2, the inner cutter further includes a fixing device 113, a cutter cover plate 114, a cutter pressing plate 115, a spring 116, an oil cylinder (not labeled) and an oil cylinder seat 117.

The oil cylinder seat 117 is positioned at one end of the sliding block 111 and connected with the sliding block 111; the cylinder block 117 is provided with at least one cylinder block hole 1171, and a cylinder is installed in each cylinder block hole 1171.

And the oil cylinder is fixedly arranged on the oil cylinder base and used for driving the cutter 112 to move relative to the sliding block 111, so that the cutter 112 cuts off the water gap material A on the product B.

The cutter cover plate 114 is arranged on the sliding block 111 and fixedly connected with the sliding block 111 through screws; the cutter cover plate 114 is provided with a limit step 1141 for abutting against the fixing device 113.

The cutter 112 is installed between the cutter cover 114 and the slider 111.

As shown in fig. 3, the thickness of the shank 1123 of the cutter blade 112 is larger than the thickness of the cutter head 1122, and the rigidity and strength of the entire cutter blade 112 can be improved. Specifically, the thickness of the cutter head 1122 is preferably (0.15-0.25) mm, and the thin cutter 1121 and the cutter head 1122 are easy to be notched and are not easy to cut off the nozzle material a when the cutter head is too thick.

The knife edge 1121 connected with the knife head 1122 is designed with an inclined plane, so that a product B with better fracture quality can be obtained.

In some embodiments, shank 1123 of cutter 112 is further provided with a first boss 1124 connected to fixture 113 and at least one curved recess 1125 for receiving spring 116.

Specifically, the material of the cutter 112 is a high-strength quenching material.

As shown in fig. 2, the fixing device 113 is located between the cutter cover plate 114 and the slider 111, and the fixing device 113 includes a stopper 1131 and a fixing block 1132. The fixing block 1132 is provided with a through hole and a second boss 1132 a.

After the stop 1131 is fixedly connected to the fixing block 1132 by a connection method such as a screw, a groove is formed between the stop 1131 and the fixing block 1132. The first boss 1124 of the cutter 112 penetrates through the through hole of the fixing block 1132 and then is inserted into the groove, and is connected with the second boss 1132a of the fixing block 1132 in an embedded manner.

In the actual operation process, the oil cylinder pushes the fixing device 113 connected with the cutting knife 112 in an embedded mode, and the cutting knife 112 is driven to move through the fixing device 113. When the fixing block 1132 of the fixing device 113 abuts against the limit step 1141 of the cutter cover plate 114, the oil cylinder stops pushing the fixing device 113 to continue to advance, and the cutter 112 stops moving. At this time, the nozzle material a on the product B is cut.

According to the die-in cutting device provided by the embodiment of the utility model, the limiting step 1141 is arranged, so that the effect of limiting the maximum moving distance of the cutter 112 can be achieved, and the cutter 112 is prevented from further moving to damage a core (not marked) and a cutter 112 body of the injection mold 100.

In some embodiments, as shown in fig. 2, at least one pocket is formed between the holder 113, the curved recess 1125 of the cutter 112, and the slider 111. A spring 116 or similar resilient element is mounted within the chamber.

The length of the spring 116 is greater than or equal to the depth of the pocket. The spring 116 releases the elastic potential energy to automatically reset the cutter 112 after the cutter 112 completes the cutting operation of the nozzle material.

In addition, the spring 116 can also buffer the impact load of the cutter 112 during the movement of the fixing device 113 pushed by the cylinder.

Referring to fig. 2, the cutter pressing plate 115 is mounted on one side of the cutter cover plate 114, and may be fixedly connected to the cutter cover plate 114 by screws.

Preferably, the thickness of the cutter pressing plate 115 can be made to a dimensional tolerance of 0.02mm to avoid thermal expansion that could cause the cutter 112 to move unsmoothly. The cutter pressing plate 115 is covered on the cutter head 1122 of the cutter 112 and is located between the cutter 112 and the cutter cover plate 114.

The thickness of the tool bit 1122 of the cutting knife 112 is smaller than that of the tool shank 1123 of the cutting knife 112. Therefore, the rigidity of the cutter head 1122 of the cutter 112 is insufficient, and the cutter head 1122 is likely to be excessively bent and deformed or even broken during the cutting process of the cutter 112.

The cutter pressing plate 115 provided by the embodiment can effectively prevent the cutter head 1122 of the cutter 112 from being excessively bent and deformed or even broken in the working process.

Further, one end of the cutter pressing plate 115 may be provided with an inclined surface and extend out of the cutter cover plate 114, so as to remove the burrs accumulated on the blade 1121 of the cutter 112.

Based on the in-mold cutting device 11 provided by the embodiment of the utility model, the utility model further provides an injection mold 100 using the in-mold cutting device 11.

As shown in fig. 1, the injection mold 100 includes: an in-mold cutting device 11, a front mold 12 and a rear mold 13.

The in-mold cutting device 11 is installed between the front mold 11 and the rear mold 12 of the injection mold 100. During the opening and closing process of the injection mold 100, the mold inner cutting device 11 can be driven by the slide block 111 to move relative to the rear mold 13.

In the non-operating state, the cutter 112 of the in-mold cutting device 11 is housed in the in-mold cutting device 11. The front mold 12 is provided with a feed inlet (not labeled) and a first cavity (not labeled), and the feed inlet is connected with the first cavity through a water path (not labeled). The raw materials flow into the first cavity from the feed inlet through the waterway.

The rear mold 13 is provided with an ejection mechanism (not labeled) and a second cavity (not labeled), and the ejection mechanism is located below the second cavity and is arranged at the bottom of the rear mold 13. After the front mold 12 and the rear mold 13 are closed, the end of the front mold 12 provided with the first cavity contacts with the end of the rear mold 13 provided with the second cavity to form a mold cavity (not labeled) for molding the product B.

The process of molding product B in injection mold 100 is as follows:

first, the front mold 12 and the rear mold 13 are closed with a certain locking force, and the mold inner cutting device 11 is driven by the slider 111 to move to a predetermined operating point from one side of the injection mold 100 (the position where the mold inner cutting device 11 is not in operation, hereinafter referred to as an initial position) along with the closing of the front mold 12 and the rear mold 13. The preset working point is the position of the in-mold cutting device 11 when the product B is formed, and the in-mold cutting device 11 is always in the initial position when the product B is not in working state.

Next, after the mold cutting device 11 moves to the preset operating point, the raw material of the product B is heated at a high temperature to be in a molten state, and a material injection needle (not shown) injects the raw material of the product B in the molten state from the feed port of the front mold 12 at a certain injection pressure, and the raw material in the molten state flows into the mold cavity through the water path.

After maintaining the pressure for a predetermined time, the raw material in the molten state is cooled and solidified in the mold cavity and the water channel. And cooling and molding the raw material in a molten state in the mold cavity to form a product B, and cooling and molding the raw material remained in the water way in the injection molding process to form a nozzle material A connected with the product.

After the raw material in the molten state is solidified and formed, the in-mold cutting device 11 is started, and the cutter 112 extends out of the in-mold cutting device 11 and moves to a position where the nozzle material a is connected with the product B, so that the nozzle material a is cut off from the product B. After the nozzle material a is cut, the cutter 112 is retracted to the original position, that is, is accommodated in the in-mold cutting device 11.

Finally, the injection mold 100 is opened, the mold inner cutting device 11 is driven by the slide block 111 to return to the initial position from the preset working point along with the separation of the front mold 12 and the rear mold 13, then the ejection mechanism ejects the sprue material a and the product B out of the cavity, and a mechanical arm (not labeled) takes out the sprue material a and the product B.

The utility model provides an in-mold cutting device 11 and an injection mold 100 thereof, wherein the in-mold cutting device 11 comprises a sliding block 111 and an internal cutter, the internal cutter is arranged on the sliding block 111, and the internal cutter can reciprocate relative to the sliding block 111 to execute cutting action; the inner cutter comprises a cutter 112, and the cutter 112 is of a template structure and can cut off the plate-shaped nozzle material. Compared with the traditional method for cutting off the nozzle material, the injection mold 100 with the in-mold cutting device 11 can separate the nozzle material A and the product B before the injection mold 100 is opened, so that extra operation for cutting off the nozzle material is omitted, the product B with a smooth fracture is obtained, the problems of saw tooth shape and corner collapse of the fracture of the product B when the nozzle material is manually cut off are solved, the production stability and yield of the product are improved, and the production cost is saved.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. An in-mold cutting device, comprising:

the sliding block is used for mounting an inner cutting tool;

an inner cutter, the inner cutter comprising:

the cutting knife can move in a reciprocating manner, is of a template structure and is used for cutting off the nozzle material;

the cutter comprises a cutter edge, a cutter head and a cutter handle;

the knife edge is positioned at one end of the cutter, the cutter handle is arranged at one end away from the knife edge, and the cutter head is connected between the knife edge and the cutter handle;

the knife edge is provided with an inclined plane; the thickness of the tool bit is smaller than that of the tool handle.

2. The in-mold cutting device of claim 1, wherein the inner cutter further comprises a cutter cover plate; the cutter cover plate is provided with a limiting step for limiting the maximum moving distance of the cutter; the cutter cover plate is arranged on the sliding block and fixedly connected with the sliding block.

3. The in-mold cutting device of claim 2, wherein the inner cutter further comprises a cutter platen; the cutter pressing plate is fixedly connected with the cutter cover plate; the cutter pressing plate is located between the cutter cover plate and the cutter head of the cutter.

4. The in-mold cutting device of claim 2, wherein the shank is provided with a first boss; the inner cutter also comprises a fixing device; the fixing device is positioned between the cutter cover plate and the sliding block; the fixing device is connected with the first boss of the cutter; at least one accommodating chamber is formed among the fixing device, the cutter and the sliding block.

5. The in-mold cutting device according to claim 4, wherein the fixing means includes a fixing block and a stopper; the fixed block is provided with a second boss which is used for being embedded and connected with the first boss of the cutter; the fixed block and the stop block are fixedly connected to form a groove for accommodating the first boss of the cutter.

6. The in-mold cutting device of claim 4, wherein the shank has at least one curved groove; the inner cutter further comprises at least one spring; the spring is arranged in the accommodating chamber, and the length of the spring is greater than or equal to the depth of the accommodating chamber; the spring is used for enabling the cutter to automatically reset and buffering the impact load of the cutter.

7. The in-mold cutting device according to claim 1, further comprising an oil cylinder; the internal cutting tool also comprises an oil cylinder base, and the oil cylinder base is provided with at least one oil cylinder base hole for mounting the oil cylinder; the oil cylinder seat is positioned at one end of the sliding block and is connected with the sliding block.

8. An injection mould comprising a front mould and a rear mould, the rear mould being provided with an in-mould cutting device as claimed in any one of claims 1 to 7; the die internal cutting device is arranged between the front die and the rear die.

9. An injection mould according to claim 8, wherein the front mould is provided with a feed opening and a first cavity; the feed inlet is used for injecting a molding raw material of a product; the end of the front die provided with the first cavity is in contact with the rear die.

10. An injection mould according to claim 9, wherein the rear mould is provided with a second cavity and an ejection structure; one end of the rear die provided with the second cavity is contacted with one end of the front die provided with the first cavity to form a die cavity for forming the product; the ejection structure is arranged at the bottom of the rear die and used for ejecting the product out of the second cavity.