CN210819929U

CN210819929U - Positioning shearing die

Info

Publication number: CN210819929U
Application number: CN201921595428.XU
Authority: CN
Inventors: 施少强
Original assignee: Guangdong Yuanxin Precision Mold Technology Co ltd
Current assignee: Guangdong Yuanxin Precision Mold Technology Co ltd
Priority date: 2019-09-24
Filing date: 2019-09-24
Publication date: 2020-06-23
Anticipated expiration: 2029-09-24

Abstract

The utility model provides a location shear die, includes upper punch shear die and lower punch shear die, characterized by: the upper punching shear die comprises an upper die plate, an upper die body, a blade, an outer knife rest, an inner knife rest and a pipe front frame, wherein the upper die body is arranged on the upper die plate and is positioned below the upper die plate, the outer knife rest is arranged on the upper die body and is positioned below the upper die body, the blade and the inner knife rest are both arranged on the outer knife rest, the blade is clamped by the outer knife rest and the inner knife rest together, the lower end of the blade is provided with an annular cutting edge, the pipe front frame is arranged on the inner side of the blade, and an annular positioning gap is formed between the blade and the pipe front frame; the lower punching shear die comprises a lower die plate, a lower die body and a cutting board, wherein the lower die body is arranged on the lower die plate and is positioned above the lower die plate, and the cutting board is arranged on the lower die body and is positioned above the lower die body. The utility model discloses when punching and shearing the operation, can make the annular cutting edge of blade lower extreme and the position that the shaping sheet need be cuted aim at, consequently can punch and shear on the accurate position on the shaping sheet, the product of acquisition is comparatively pleasing to the eye.

Description

Positioning shearing die

Technical Field

The utility model relates to a thermoforming equipment, concretely relates to mould is sheared in location for thermoforming machine.

Background

Thermoforming machines are common devices for making and processing various plastic products, such as cups, lids, trays made of PS, PET, PVC materials, etc., and are usually heated and formed by thermoforming machines.

The existing thermoforming machine generally comprises a machine frame, a material traction device, a heating forming device and a punching and shearing device, wherein the material traction device, the heating forming device and the punching and shearing device are arranged on the machine frame. The material traction device sequentially conveys the plastic sheets to the heating forming device and the punching and shearing device; the heating forming device is used for heating and forming the plastic sheet to obtain a formed sheet, and the plastic product units on the formed sheet are connected in a sheet mode; the punching and shearing device performs punching and shearing treatment on the formed sheet to form a single plastic product unit (namely a finished product).

The punching and shearing device of the existing thermoforming machine generally comprises a machine frame, a lower punching and shearing die, an upper punching and shearing die and an upper punching and shearing die lifting and driving mechanism, wherein the lower punching and shearing die and the upper punching and shearing die form a shearing die. The size and the shape of the upper punching shear die are matched with those of the lower punching shear die, the lower punching shear die is arranged on the rack, and the upper punching shear die is positioned above the lower punching shear die and is connected with the upper punching shear die lifting driving mechanism. The upper punching shear die lifting driving mechanism is used for driving the upper punching shear die to move up and down, and usually adopts a motor or an air cylinder to provide power. When the punching and shearing machine works, a formed sheet to be punched and sheared is conveyed to a lower punching and shearing die; under the action of the upper punching shear die lifting driving mechanism, the upper punching shear die moves downwards and is matched with the lower punching shear die to perform punching shear processing on the formed sheet, and a single plastic product unit is punched and sheared; and then, under the action of the lifting driving mechanism of the upper punching shear die, the upper punching shear die moves upwards, the upper punching shear die is separated from the lower punching shear die, the plastic product which is subjected to punching at the moment exits from the lower punching shear die, and meanwhile, a new section of formed sheet is conveyed to the lower punching shear die to wait for the next punching shear. Although the punching and shearing device can automatically complete punching and shearing, and the upper punching and shearing die and the lower punching and shearing die can be normally matched in a position accurate manner, when a formed sheet enters the lower punching and shearing die, a plastic product unit on the formed sheet often cannot completely and accurately reach a preset position, but has slight deviation, so that when the upper punching and shearing die moves downwards and is matched with the lower punching and shearing die, the punching and shearing parts of the upper punching and shearing die and the lower punching and shearing die cannot completely align with the outline line of the plastic product unit actually required on the formed sheet, namely the position of the outline line slightly deviates from the actually required outline line, the product is not beautiful, and a plurality of defective products are generated.

Disclosure of Invention

The utility model aims to solve the technical problem that a mould is sheared in location is provided, this kind of mould is sheared in location is used for shearing the device on punching of thermoforming machine, can punch on the accurate position on the shaping sheet and cut, obtains the plastic products unit that meets the requirements, and the product is comparatively pleasing to the eye. The technical scheme is as follows:

the utility model provides a location shear die, includes upper punch shear die and lower punch shear die, characterized by: the upper punching shear die comprises an upper die plate, an upper die body, a blade, an outer knife rest, an inner knife rest and a pipe front frame, wherein the upper die body is arranged on the upper die plate and is positioned below the upper die plate, the outer knife rest is arranged on the upper die body and is positioned below the upper die body, the blade and the inner knife rest are both arranged on the outer knife rest, the blade is clamped by the outer knife rest and the inner knife rest together, the lower end of the blade is provided with an annular cutting edge, the pipe front frame is arranged on the inner side of the blade, and an annular positioning gap is formed between the blade and the pipe front frame; the lower punching shear die comprises a lower die plate, a lower die body and a cutting board, wherein the lower die body is arranged on the lower die plate and is positioned above the lower die plate, and the cutting board is arranged on the lower die body and is positioned above the lower die body.

In the positioning and shearing die, the shape and the size of the positioning gap are matched with the edge of the plastic product unit (such as the edge of a cup opening of a plastic cup or the edge of a plastic cover). When the device works, a formed sheet obtained by heating and forming through the heating and forming device reaches a preset position of the lower punching and cutting die; then the upper punching shear die descends, the outer cutter frame, the inner cutter frame, the blade and the pipe positive frame descend together, and the edge of the plastic product on the formed sheet is aligned to the positioning gap and gradually enters the positioning gap; with the further descending of the outer cutter frame, the inner cutter frame, the blades and the pipe front frame, the edge of the plastic product unit enters a positioning gap, the annular cutting edge at the lower end of each blade is matched with the upper surface of the chopping board, the plastic product unit is sheared from the formed sheet material at the corresponding position of the formed sheet material, and a single plastic product is obtained; and then the upper punching die rises, the upper punching die is separated from the lower punching die, the plastic product unit which completes punching at the moment exits from the lower punching die (the punched plastic product can be taken out by a mechanical arm), and a new section of formed sheet is conveyed to the lower punching die to wait for the next punching. Because the edge of the plastic product enters the positioning gap and is aligned with the pipe by the pipe alignment frame and the blade, the annular cutting edge at the lower end of the blade is aligned with the position of the formed sheet to be cut (the annular cutting edge is aligned with the outline of the plastic product unit actually required on the formed sheet), punching and cutting can be carried out on the accurate position on the formed sheet, the plastic product unit meeting the requirements is obtained, and the product is more attractive.

In a preferred embodiment, the outer tool holder is rotatably mounted on the upper mold body. After the plastic sheet is heated and formed, the formed sheet is cooled in the process of being conveyed to the punching and shearing device, the formed sheet usually has micro deformation in the cooling process, and micro deflection may occur to the plastic product unit. In a specific scheme, an outer cutter frame positioning shaft which moves up and down is arranged on the upper die body, the upper end of the outer cutter frame positioning shaft is connected with the upper die body, a positioning shaft sleeve hole is formed in the outer cutter frame, and the outer cutter frame positioning shaft is located in the positioning shaft sleeve hole, so that the outer cutter frame can rotate (usually rotate in a small mode) around the outer cutter frame positioning shaft. In a more preferable scheme, a plane bearing capable of supporting the outer tool rest is arranged at the lower end of the outer tool rest positioning shaft, the plane bearing supports the outer tool rest to prevent the outer tool rest from falling off, and meanwhile, the plane bearing is matched with the outer tool rest to prevent the outer tool rest from rotating relative to the upper die body.

In a preferred embodiment, the upper punching shear further includes an upper die pad, and the upper die pad is mounted on the upper die body and located below the upper die body. Under the condition of being provided with the upper die base plate, the outer knife rest can be rotatably arranged on the upper die base plate, and the upper end of the outer knife rest positioning shaft is connected with the upper die base plate.

In general, the top of the outer tool holder contacts the lower surface of the upper mold body (in the case of the upper mold base plate, the top of the outer tool holder contacts the lower surface of the upper mold base plate), and the outer tool holder does not rotate freely due to the frictional force between the top of the outer tool holder and the lower surface of the upper mold body.

In the preferred scheme, a floating spring is arranged between the pipe positive frame and the outer tool rest, the floating spring is a compression spring, the upper end of the floating spring is connected or in close contact with the outer tool rest, and the lower end of the floating spring is connected or in close contact with the pipe positive frame. The floating spring can apply downward acting force to the pipe aligning frame; when the positive frame of pipe contacts the edge of plastic unit, the floating spring is pushed by the edge of plastic unit to contract properly, so that the positive frame of pipe can be regulated in position to make the edge of plastic unit enter the locating gap smoothly.

In a more preferable scheme, a limit screw is arranged on the outer tool rest, a limit through hole is formed in the tube positive frame, the inner diameter of the upper portion of the limit through hole is smaller than the lower portion of the limit through hole, the rod portion of the limit screw is located in the upper portion of the limit through hole, and the head portion of the limit screw is located in the lower portion of the limit through hole.

In a more preferable scheme, the outer tool rest is provided with a tube positive shaft which moves up and down, the tube positive frame is provided with a tube positive guide hole, and the tube positive shaft is positioned in the tube positive guide hole. The tube alignment guide hole is matched with the tube alignment shaft to play a role in positioning the tube alignment frame.

In one specific scheme, the outer tool rest comprises an outer tool rest plate and an outer blade limiting ring, wherein the outer blade limiting ring is arranged at the edge of the outer tool rest plate (the outer blade limiting ring and the outer tool rest plate can be manufactured into a whole); the inner cutter frame comprises a blade inner limiting ring, the blade is arranged between the blade inner limiting ring and the blade outer limiting ring, and the blade is clamped by the blade inner limiting ring and the blade outer limiting ring together. Generally, the upper end of the blade and the upper end of the inner spacing ring of the blade are both in close contact with the lower surface of the outer tool rest plate, and the outer tool rest plate can support the blade and the inner spacing ring of the blade, so that the positions among the blade, the outer spacing ring of the blade and the inner spacing ring of the blade are kept stable. Under the condition that the upper die body is provided with an outer knife rest positioning shaft which moves up and down, the positioning shaft sleeve joint hole is arranged on the outer knife rest plate.

The blade is formed by bending a strip-shaped blade and is connected end to end, and the lower edge of the strip-shaped blade is provided with a cutting edge; the outer cutter frame and the inner cutter frame are clamped together and then fixed, so that an annular cutting edge with a required shape is formed at the lower end of the inner cutter frame. The strip-shaped blade is good in toughness and can be bent as required. The blade can be made of carbon steel or manganese steel, and the thickness of the blade is generally 1-2 mm.

In a preferred embodiment, the lower punching die further comprises a lower pad plate, and the lower pad plate is arranged between the lower die body and the chopping block. The lower backing plate has a buffering effect, so that the impact of the blade on the chopping board can be weakened, and the service lives of the blade and the chopping board are prolonged.

The lower backing plate can be made of polyurethane elastomer, nylon or aluminum alloy. The chopping board can be made of stainless steel plates.

The above-mentioned chopping block is provided according to the specific case of plastic products, for example: (1) under the condition that the plastic product unit is a plastic cover, the chopping block is a whole flat plate; or (2) when the plastic product unit is a plastic container with a certain depth such as a plastic cup, a plastic box and the like, the chopping board is provided with an opening, the lower die body and the lower backing board are provided with cavities corresponding to the opening, the cavities are used for accommodating the container body of the plastic container in the formed sheet, and the edge of the plastic container extends out of the opening and is hung on the chopping board.

The utility model discloses a mould is sheared in location is used for the shearing mechanism of thermoforming machine to go on dashing when cutting the operation, can make the annular cutting edge of blade lower extreme and the position that the shaping sheet need be cuted aim at, consequently can dash on the accurate position on the shaping sheet and cut, and the product of acquisition is comparatively pleasing to the eye.

Drawings

Fig. 1 is a schematic structural view (mold clamping state) of a preferred embodiment 1 of the present invention;

fig. 2 is a schematic structural view (mold clamping state) of preferred embodiment 2 of the present invention.

Detailed Description

Example 1

As shown in fig. 1, this positioning shear die includes an upper shear die 1 and a lower shear die 2; the upper punching shear die 1 comprises an upper die plate 11, an upper die body 12, a blade 13, an outer knife rest 14, an inner knife rest 15 and a tube front frame 16, wherein the upper die body 12 is arranged on the upper die plate 11 and is positioned below the upper die plate 11, the outer knife rest 14 is arranged on the upper die body 12 and is positioned below the upper die body 12, the blade 13 and the inner knife rest 15 are both arranged on the outer knife rest 14, the blade 13 is clamped by the outer knife rest 14 and the inner knife rest 15 together, the lower end of the blade 13 is provided with an annular cutting edge, the tube front frame 16 is arranged on the inner side of the blade 13, and an annular positioning gap 17 is formed between the blade 13 and the tube front frame 16; the lower shear die 2 comprises a lower die plate 21, a lower die body 22 and an anvil 23, the lower die body 22 being mounted on the lower die plate 21 and above the lower die plate 21, the anvil 23 being mounted on the lower die body 22 and above the lower die body 22.

The upper die 1 further comprises an upper die plate 18, the upper die plate 18 being mounted on the upper die body 12 and below the upper die body 12, and in this embodiment the outer blade carrier 14 is rotatably mounted on the upper die plate 18 (in the case where no upper die plate is provided, the outer blade carrier is rotatably mounted on the upper die body). An outer cutter frame positioning shaft 19 which moves up and down is arranged on the upper mold base plate 18 (under the condition that the upper mold base plate is not arranged, the outer cutter frame positioning shaft is arranged on the upper mold body), the upper end of the outer cutter frame positioning shaft 19 is connected with the upper mold base plate 18, a positioning shaft sleeve hole 110 is arranged on the outer cutter frame 14, and the outer cutter frame positioning shaft 19 is arranged in the positioning shaft sleeve hole 110, so that the outer cutter frame 14 can rotate (usually rotate in a small range) around the outer cutter frame positioning shaft 19. The lower end of the outer blade holder positioning shaft 19 is provided with a plane bearing 111 capable of supporting the outer blade holder 14.

In this embodiment, a floating spring 112 is disposed between the tube front frame 16 and the outer tool holder 14, the floating spring 112 is a compression spring, the upper end of the floating spring 112 is connected or tightly contacted with the outer tool holder 14, and the lower end of the floating spring 112 is connected or tightly contacted with the tube front frame 16.

The outer tool rest 14 is provided with a limit screw 113, the tube front frame 16 is provided with a limit through hole 114, the inner diameter of the upper part of the limit through hole 114 is smaller than the lower part of the limit through hole 114, the rod part of the limit screw 113 is positioned in the upper part of the limit through hole 114, and the head part of the limit screw 113 is positioned in the lower part of the limit through hole 114.

The outer tool rest 14 is provided with a tube alignment shaft 115 which moves up and down, the tube alignment frame 16 is provided with a tube alignment guide hole 116, and the tube alignment shaft 115 is positioned in the tube alignment guide hole 116. The alignment guide hole 116 cooperates with the alignment shaft 115 to position the alignment frame 16.

The outer tool rest 14 of this embodiment includes an outer tool rest plate 141 and an outer blade retaining ring 142, the outer blade retaining ring 142 is disposed on the edge of the outer tool rest plate 141 (the outer blade retaining ring 142 and the outer tool rest plate 141 are formed into one body), and the positioning shaft sleeving hole 110 is disposed on the outer tool rest plate 141; the inner blade holder 15 includes an inner blade retaining ring 151, the blade 13 is disposed between the inner blade retaining ring 151 and the outer blade retaining ring 142, and the inner blade retaining ring 151 and the outer blade retaining ring 142 clamp the blade 13 together. The upper end of the blade 13 and the upper end of the blade inner spacing ring 151 are both in close contact with the lower surface of the outer tool rest plate 141, and the outer tool rest plate 141 can support the blade 13 and the blade inner spacing ring 151, so that the positions among the blade 13, the blade outer spacing ring 142 and the blade inner spacing ring 151 are kept stable. The top surface of the outer holder plate 141 contacts the lower surface of the upper die shim plate 18 (in the case where no upper die shim plate is provided, the top of the outer holder plate contacts the lower surface of the upper die body). The flat bearing 111 contacts the bottom surface of the outer holder plate 141.

The blade 13 is formed by bending strip-shaped blades and is connected end to end, and the lower edges of the strip-shaped blades are provided with cutting edges; clamped together by the outer holder 14 and the inner holder 15 and fixed thereto so as to form a ring-shaped blade of a desired shape at the lower end thereof. The strip-shaped blade is good in toughness and can be bent as required. The blade can be made of carbon steel or manganese steel, and the thickness of the blade is generally 1-2 mm.

The lower cutting die 2 further comprises a lower backing plate 24, and the lower backing plate 24 is arranged between the lower die body 22 and the anvil plate 23. The lower backing plate 24 has a buffering function, so that the impact of the blade 13 on the cutting board 23 can be weakened, and the service lives of the blade 13 and the cutting board 23 are prolonged.

The lower backing plate 24 may be made of polyurethane elastomer, nylon, or aluminum alloy. The anvil 23 can be made of stainless steel.

The working principle of the positioning and shearing die is briefly described as follows:

the positioning and shearing die of the present embodiment is used to shear the plastic product units 4 (plastic lids) from the formed sheet 3, in this case the anvil 23 being a one-piece flat plate. The shape and size of the positioning gap 17 in the positioning and shearing die is matched to the rim 41 of the plastic product unit 4 (plastic lid).

When the device works, a formed sheet 3 obtained by heating and forming through a heating and forming device reaches a preset position of the lower punching and cutting die 2; then the upper punching shear die 1 descends, the outer cutter frame 14, the inner cutter frame 15, the blade 13 and the pipe frame 16 descend together, and the plastic product edge 41 on the molding sheet 3 is aligned with the positioning gap 17 and gradually enters the positioning gap 17; with the further descending of the outer cutter frame 14, the inner cutter frame 15, the blade 13 and the tube front frame 16, the edge 41 of the plastic product unit 4 enters the positioning gap 17, the annular cutting edge at the lower end of the blade 13 is matched with the upper surface of the chopping block 23, the shearing is carried out on the corresponding position of the formed sheet 3, the plastic product unit 4 is sheared from the formed sheet 3, and a single plastic product is obtained; subsequently, the upper die 1 rises, the upper die 1 is separated from the lower die 2, the plastic product unit which completes the punching is withdrawn from the lower die 2 (the punched plastic product can be taken out by the manipulator), and a new section of formed sheet is conveyed to the lower die 2 to wait for the next punching. Since the edge 41 of the plastic unit enters the positioning gap 17 and the pipe alignment is shared by the pipe alignment frame 16 and the blade 13, the annular cutting edge at the lower end of the blade 13 is aligned with the position to be cut of the formed sheet 3 (the annular cutting edge is aligned with the contour line of the plastic unit actually required on the formed sheet), and punching and cutting can be performed at the accurate position on the formed sheet 3.

Because the outer cutter frame 14 is rotatably mounted on the upper die body 12, in the case of slight deflection of the plastic product unit 4 on the molding sheet 3, the plastic product edge 41 on the molding sheet 3 can slightly deflect around the outer cutter frame positioning shaft 19 correspondingly during the process of entering the positioning gap 17, so that the positions of the outer cutter frame 14, the inner cutter frame 15, the cutter 13 and the tube positive frame 16 are corrected, and the edge 41 of the plastic product unit can smoothly enter the positioning gap 17.

The floating spring 112 is capable of applying a downward force to the alignment frame 16; when the tube frame 16 contacts the edge 41 of the plastic unit, the floating spring 112 is pushed down by the edge 41 of the plastic unit to contract properly, so that the tube frame 16 can be adjusted in position slightly, and the edge 41 of the plastic unit can enter the positioning gap 17 smoothly.

Example 2

As shown in fig. 2, the present embodiment is different from embodiment 1 in that: the chopping board 23 is provided with an opening 25, and the lower die body 22 and the lower chopping board 24 are provided with a cavity 26 corresponding to the opening 25. This positioning and shearing die is suitable for the case where the plastic product unit 4 is a plastic container with a certain depth, such as a plastic cup, a plastic box, etc., the cavity 269 is used to accommodate the body of the plastic container in the formed sheet 3, and the rim 41 of the plastic container extends out of the opening 25 and is hung on the anvil 23.

The rest of the structure of this embodiment is the same as embodiment 1.

Claims

1. The utility model provides a location shear die, includes upper punch shear die and lower punch shear die, characterized by: the upper punching shear die comprises an upper die plate, an upper die body, a blade, an outer knife rest, an inner knife rest and a pipe front frame, wherein the upper die body is arranged on the upper die plate and is positioned below the upper die plate, the outer knife rest is arranged on the upper die body and is positioned below the upper die body, the blade and the inner knife rest are both arranged on the outer knife rest, the blade is clamped by the outer knife rest and the inner knife rest together, the lower end of the blade is provided with an annular cutting edge, the pipe front frame is arranged on the inner side of the blade, and an annular positioning gap is formed between the blade and the pipe front frame; the lower punching shear die comprises a lower die plate, a lower die body and a cutting board, wherein the lower die body is arranged on the lower die plate and is positioned above the lower die plate, and the cutting board is arranged on the lower die body and is positioned above the lower die body.

2. A positional shear die as claimed in claim 1, wherein: the outer tool rest can be rotatably arranged on the upper die body.

3. A positional shear die as claimed in claim 2, wherein: the upper die body is provided with an outer knife rest positioning shaft which moves up and down, the upper end of the outer knife rest positioning shaft is connected with the upper die body, the outer knife rest is provided with a positioning shaft sleeve hole, and the outer knife rest positioning shaft is positioned in the positioning shaft sleeve hole.

4. A positional shear die as claimed in claim 3, wherein: and the lower end of the outer cutter frame positioning shaft is provided with a plane bearing capable of supporting the outer cutter frame.

5. A positioning and shearing die as claimed in any one of claims 1 to 4, wherein: the upper punching shear die also comprises an upper die base plate, and the upper die base plate is arranged on the upper die body and is positioned below the upper die body.

6. A positioning and shearing die as claimed in any one of claims 1 to 4, wherein: the top of the outer tool rest is in contact with the lower surface of the upper die body.

7. A positional shear die according to claim 5, wherein: the top of the outer tool rest is in contact with the lower surface of the upper die base plate.

8. A positioning and shearing die as claimed in any one of claims 1 to 4, wherein: a floating spring is arranged between the tube positive frame and the outer tool rest and is a compression spring, the upper end of the floating spring is connected or in close contact with the outer tool rest, and the lower end of the floating spring is connected or in close contact with the tube positive frame.

9. A positional shear die as claimed in claim 8, wherein: the outer tool rest is provided with a limiting screw, the pipe front frame is provided with a limiting through hole, the inner diameter of the upper part of the limiting through hole is smaller than that of the lower part of the limiting through hole, the rod part of the limiting screw is positioned in the upper part of the limiting through hole, and the head part of the limiting screw is positioned in the lower part of the limiting through hole; the outer cutter frame is provided with a tube positive shaft which moves up and down, the tube positive frame is provided with a tube positive guide hole, and the tube positive shaft is positioned in the tube positive guide hole.

10. A positioning and shearing die as claimed in any one of claims 1 to 4, wherein: the outer cutter frame comprises an outer cutter frame plate and an outer cutter blade limiting ring, and the outer cutter blade limiting ring is arranged at the edge of the outer cutter frame plate; the inner cutter frame comprises a blade inner limiting ring, the blade is arranged between the blade inner limiting ring and the blade outer limiting ring, and the blade is clamped by the blade inner limiting ring and the blade outer limiting ring together.