CN110978135A

CN110978135A - Composite die for punching and cutting plastic suction products

Info

Publication number: CN110978135A
Application number: CN201911341201.7A
Authority: CN
Inventors: 曾龙茂
Original assignee: Dongguan Dehua Thermoforming Mould Industry Co Ltd
Current assignee: Dongguan Dehua Thermoforming Mould Industry Co Ltd
Priority date: 2019-12-24
Filing date: 2019-12-24
Publication date: 2020-04-10

Abstract

A composite mould for punching and cutting plastic products features that after plastic sucking is finished, the punching and cutting are performed in two steps, and the punching and cutting are finished at different time intervals in the same period. When an upper die of a punch station descends to a stripper plate to contact a product, the stripper plate is used for positioning the product, the upper die continues to descend to punch the product by a punch, and the upper die continues to descend to cut the product by a laser blade after punching is finished, so that two different processes of punching and cutting are finished.

Description

Composite die for punching and cutting plastic suction products

Technical Field

The invention relates to a composite die which heats and softens a plastic sheet, continuously passes through a sealed cavity in sequence, a plurality of small air holes are arranged in the cavity, negative air pressure of a forming device forms adsorption force on the plastic sheet through the air holes, positive air pressure forms pressure on the back surface of the sheet, the softened plastic sheet is adsorbed on the surface of the cavity and is formed into a continuous plastic uptake semi-finished product after being cooled, the plastic uptake semi-finished product is driven by a caterpillar, and the plastic uptake semi-finished product is punched and cut in the next punch press station.

Background

At present, the thermoforming industry completes blister products with plane holes and side holes in a process of manufacturing an all-in-one machine of a connecting line by two working procedures of punching and cutting, wherein the punching process needs a set of specific punching dies and needs a specific workstation. The cutting process requires an additional set of dies to cut the punched product. The prior art needs two sets of specific dies and two workstations to work simultaneously, and positioning errors can occur from punching to cutting when secondary positioning is needed for blanking, so that the hole site deviation of products and the uneven edge are caused.

Disclosure of Invention

In order to overcome the problems of high cost and deviation of positioning in the process of punching and cutting the plastic suction products, the invention provides the composite die for punching and cutting the plastic suction products with plane holes or side holes, which not only reduces the cost, but also prolongs the service life of the die.

The technical scheme of the invention is as follows: the upper die part of the composite die is provided with an upper metal bottom plate, a punching needle fixing plate is arranged on the upper metal bottom plate, and the punching needle and the inclined plane punching needle are fixed on the punching needle fixing plate. The inclined plane punching needle for punching the side hole on the punching needle fixing plate is additionally fixed with a section to relieve the transverse reaction force during side punching and ensure that the inclined plane punching needle does not generate transverse displacement. The edge appearance of the punching needle fixing plate is made to be consistent with the edge appearance of a plastic suction product, a laser blade is arranged on the periphery of the edge of the punching needle fixing plate, a stripper plate is arranged below the punching needle fixing plate, and the stripper plate carries out reasonable avoidance on a needle protection structure of the inclined plane punching needle according to the punching needle fixing plate, so that the strength of the stripper plate is ensured, and the exposed length of the inclined plane punching needle on the fixing plate is shortened as much as possible. A spring is arranged between the punching needle fixing plate and the stripper plate, and a small guide pillar is arranged between the punching needle fixing plate and the stripper plate and plays a role in guiding the in-mold movement of the stripper plate. The stripper plate firstly positions the blister semi-finished product in the descending action of the upper die, the upper die continues to descend to complete punching of the blister semi-finished product, and the stripper plate strips the blister semi-finished product in the ascending action after blanking. The lower die part is provided with a lower metal bottom plate, and a punching female die is fixed on the lower metal bottom plate. And respectively processing a small plane with the width of 0.3-0.5mm and vertical to the punching direction at the top end of the blade of the inclined plane punching needle and the top end of the blade of the female die hole, and changing the punching between the obtuse angle and the obtuse angle into the punching between the right angle and the right angle. The blanking inclined plane of the inclined plane punching needle and the inclined plane of the knife edge of the female die hole form a small included angle which is 3-5 degrees downwards along the inclined plane, so that the blanking becomes shearing. The periphery of the female die is provided with a Polyurethane (PU) plate, the Polyurethane (PU) plate is provided with a metal chopping board, and the plane size of the metal chopping board can meet the requirement of effectively cutting with a laser blade. After the punching action is finished, the upper die continues to move downwards, and the laser blade cuts the metal chopping board to finish cutting the semi-finished product, thereby achieving the process of the process. The laser blade can be arranged on the upper die or the lower die according to the appearance and the edge of the blister product, and the metal chopping block and the polyurethane PU plate are arranged on the other side of the lower die or the upper die corresponding to the laser blade.

The invention has the beneficial effects that: the prior art needs two sets of specific dies, and the invention only needs one set of specific dies, thereby reducing the cost of the dies. The present invention can complete the process only by one punch station, and this can reduce equipment investment and power consumption. In the prior art, the edges are cut after punching, and the size deviation of the edges of the product caused by secondary positioning is realized. Meanwhile, the requirement for the production site is reduced, and the effects of energy conservation and consumption reduction are really achieved.

Drawings

FIG. 1 is a longitudinal sectional configuration view of a single punching die

FIG. 2 is a longitudinal section configuration diagram of a single cutting die

FIG. 3 is a longitudinal sectional configuration of the present invention with a laser blade on the upper die

FIG. 4 is a longitudinal sectional configuration of the present invention with a laser blade at the lower die

FIG. 5 is a structural view of the scissor mouth of the bevel punch needle of the present invention

FIG. 6 is a schematic view of a small plane of a bevel punch needle

FIG. 7 is a longitudinal sectional view showing the structure of a needle guard for a bevel punch

In the drawing, 1, a plastic uptake semi-finished product 2, a guide post 3, a guide sleeve 4, an upper metal bottom plate 5, a lower metal bottom plate 6, a female die 7, a punching needle fixing plate 8, a plane punching needle 8-1, an inclined plane punching needle 9, a small guide post 10, a spring 11, a stripper plate 12, a cutting die upper metal bottom plate 13, a cutting die lower metal bottom plate 14, a laser blade 15, a positioning frame 16, an inner cutter block 17, a polyurethane PU plate 18 and a metal cutting board are arranged.

Detailed Description

In the embodiment of the invention shown in fig. 3, a punching needle fixing plate (7) is arranged on the upper metal bottom plate (4), and the plane punching needle (8) and the inclined plane punching needle (8-1) are fixed on the punching needle fixing plate (7). As shown in fig. 7, the inclined punching needle (8-1) can be fixed between the punching needle fixing plate (7) and the stripper plate (11) to achieve the purpose of reinforcement. The stripper plate (11) needs to reasonably avoid the supplementary fixed section. The shape of the punch pin fixing plate (7) is processed to the shape of the required plastic suction product, and a laser blade (14) is fixed on the punch pin fixing plate (7) as shown in figure 3. The lower die part is formed by combining a lower metal bottom plate (5) and a concave die (6), a metal cutting board (18) corresponding to the laser blade (14) is arranged on the periphery of the concave die (6), and a polyurethane PU plate (17) is arranged below the metal cutting board (18). When the upper die part moves downwards, the stripper plate (11) firstly positions the blister semi-finished product (1), the upper die continues to move downwards, the punching needle (8) and the inclined plane punching needle (8-1) punch into the female die (6), and at the moment, the section-cut inclined plane of the inclined plane punching needle (8-1) and the section-cut inclined plane of the knife hole of the female die (6) form an included angle of 3-5 degrees, as shown in figure 5. And the top end of the inclined plane punch pin (8-1) and the top end of the inclined plane of the knife hole of the female die (6) are respectively provided with a plane with the width of 0.3-0.5mm, as shown in figure 6, the planes can lead the inclined plane punch pin (8-1) to be punched at right angles when punching into the female die (6). The included angle between the inclined plane punching needle (8-1) and the inclined plane of the knife hole of the female die (6) can change blanking into shearing, the instant pressure of blanking is reduced, and the service life of equipment and a die is prolonged.

In another embodiment as shown in fig. 4, a punch needle fixing plate (7) is mounted on an upper metal base plate (4), a plane punch needle (8) and an inclined plane punch needle (8-1) are fixed on the punch needle fixing plate (7), a lower die part is formed by combining a lower metal base plate (5) and a female die (6), a cutting form of a plastic product with a narrow edge is suitable for mounting a laser blade (14) on the periphery of the female die (6), the shape of the female die (6) is processed to be consistent with the shape of the plastic product, and a metal cutting board (18) and a Polyurethane (PU) plate (17) are just mounted on the corresponding upper die part.

Claims

1. The utility model provides a compound mould that punches a hole and cut to moulding product which characterized by: the punching needle punches a hole on the plastic suction product, the laser blade cuts the shape of the plastic suction product, and two different punching processes are completed in the same work station and the same cycle.

2. The blanking die of claim 1, wherein: the laser blade can be arranged on the periphery of a punch needle fixing plate of the upper die or the periphery of a female die of the lower die according to the specific condition of a product, and a stripper plate is positioned and stripped during punching.

3. The blanking die of claim 1, wherein: polyurethane PU elastic glue is arranged below the metal chopping block, plays a role in buffering and balancing the blanking of the laser knife, and eliminates the condition of continuous local blanking caused by the precision errors of processing and parts.

4. The blanking die of claim 1, wherein: aiming at a product needing to punch the side hole, the fixed end of a punching needle fixing plate facing the inclined plane punching needle for punching the side hole is added with a section of needle protection structure corresponding to the punched inclined plane.

5. A blanking die for punching a side hole in a product according to claim 4, wherein: the stripper plate carries out reasonable avoidance on the needle protection structure of the inclined plane punch needle according to the punch needle fixing plate, thereby not only ensuring the strength of the stripper plate, but also shortening the exposed length of the inclined plane punch needle on the fixing plate as much as possible.

6. A blanking die for punching a side hole in a product according to claim 4, wherein: the blanking inclined plane of the inclined plane punching needle and the blanking inclined plane of the female die keep an included angle of 3-5 degrees along the positive direction of the inclined plane, and the included angle enables the inclined plane punching needle and the female die to form scissor type blanking during blanking, so that instantaneous blanking pressure is reduced exponentially, and the service lives of the die and a machine table are prolonged.

7. A blanking die for punching a side hole in a product according to claim 4, wherein: and respectively processing a 0.3-0.5mm wide small plane vertical to the punching direction at the top end of the blade of the inclined plane punching needle and the top end of the blade of the female die hole, so that the punching at the top end of the side hole is a punching between a right angle and a right angle.