JPH11277323A - Gate part punch out method and device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To carry out the gate cut of a molded part, the cut of an overflow part and the deburring (hereafter, call to gate part punch out generically) by the pressing suitable for a mass-production. SOLUTION: A gate part punch out device, in which a product 9 is fixed on a lower metal die 7 by a product hold 5 supported by an upper metal die 3 vertically and movably and a gate part can be cut by moving the upper metal die 3 has respectively an uperside punch 2 slidable in a vertical direction, fixed to the upper metal die 3, in which a slant surface, on which plural sharp edges 16 for cutting the gate are formed, is provided and a lowerside punch 6 in which the gate 1 of a punched part is held between the upperside punch 2 and it and push-pressingly supported in the upper direction so as to be driven and synchronized to the upperside punch 2 through the gate 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gate section for performing gate cutting, overflow section cutting, and deburring (hereinafter collectively referred to as gate section punching) of a die-cast, injection-molded aluminum alloy or magnesium alloy molded product. The present invention relates to a punching method and apparatus.

[0002]

2. Description of the Related Art Conventionally, it is possible to form an aluminum alloy or a magnesium alloy in a short time of 20 to 40 seconds (extremely brittle material having an elongation of about 3%). In the cutting of the overflow portion and the deburring, the product portion was punched out by a press die except for a finishing allowance of 0.5 to 1.0 mm, and then finished by a grinder. Note that the overflow portion and the burr adhere to the sprue portion, the runner portion, the gate, and various parts of the product.

[0003]

For this reason, there are problems that the process becomes two steps of molding and deburring, that the finishing is time-consuming due to the grinder work, that the atmosphere is poor and that the product varies. Was. Instead, end milling is also performed. However, in the case of a fine pattern, since the end mill diameter is too small to feed quickly, there has been a problem that the cutting time is long and the productivity is poor, which is not suitable for mass production. The object of the present invention is to solve the above-mentioned problems,
It is an object of the present invention to provide a method and an apparatus for punching a gate, which can perform gate cutting, overflow section cutting, and deburring (hereinafter collectively referred to as gate section punching) of a molded product by press working suitable for mass production.

[0004]

SUMMARY OF THE INVENTION Therefore, according to the present invention, a molded product is fixed to a lower mold by a product holder supported vertically by an upper mold, and the upper mold is moved to move the gate. In the gate punching device, which enables cutting, overflow cutting, and deburring cutting, the inclined surface, which is slidable in the vertical direction, is fixed to the upper mold, and has a plurality of gate cutting sharp edges formed thereon. An upper punch provided, and a lower punch which sandwiches a punched product gate between the upper punch and the upper punch is supported by the upper punch via the gate so as to be driven / synchronized with the upper punch. The above-mentioned problem of the prior art was solved by providing a gate part punching apparatus and method.

Preferably, instead of forming a plurality of gate cutting sharp edges on the inclined surface, electrodeposited abrasive grains may be formed on the inclined surface. Further, at the time of punching the upper punch / lower punch, the gate is gradually cut by punching by applying a minute vibration, so that a large cutting stress is not generated, cracks can be suppressed, and after punching, The cut surface can be finely finished by wrapping with a punch sharp edge or an electrodeposited abrasive grain side surface.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to FIG. FIG. 1 shows a gate section cutting apparatus in which a gate section cutting method according to an embodiment of the present invention is used. FIG. 1 shows a case where the post-molding gate 1 inside the product 9 which is a molded product is cut, but the side gate portion cutting which cuts the post-molding gate outside the product 9 is also applicable to the present invention. Can be performed by the same device as described above. 10
Denotes a sprue unit, and 11 denotes a runner unit connecting the sprue unit 10 and the gate 1. The upper punch 2, which is a cutting tool device for the gate 1, is attached to the gate cutting position of the upper die 3, and is provided with an inclined surface on the outer periphery of which a plurality of gate cutting sharp edges 16 are formed. The hole 5 is slidably inserted in the vertical direction. Lower punch 6
Is located at a position facing the upper punch 2 and the upper punch 2
Between the gate 1 and the gate 1
And is pressed and supported upward by a hydraulic bias cylinder 13 so as to be able to be driven / synchronized with the upper punch 2 and is slidably inserted in a hole 8 of a lower mold 7 in a vertical direction. That is, when the upper punch 2 vibrates minutely, the lower punch also vibrates minutely. The upper punch 2 is supported by a hydraulic vibration cylinder 12 via an upper mold 3 and a movable plate 15. The product holding cylinder 14 is vertically movably supported by the movable plate 15 and the hydraulic vibration cylinder 12, and holds the product 9 between the product holding cylinder 4 and the lower mold 7. Instead of the hydraulic bias cylinder 13, the lower punch may be supported by a spring or urethane having elasticity.

A method of cutting a gate according to the present invention will be described. When the hydraulic vibration cylinder 12 is lowered by a device (not shown), the product presser 4 supported by the product presser cylinder 14 clamps the product 9 between the product presser 9 and the lower mold 7 fixed on the press base. The clamping force can be controlled by a device (not shown). When the hydraulic vibration cylinder 12 is further lowered after being clamped by the product holder 4, the upper punch 2 is lowered, and the gate 1 is gradually cut at the sharp edge 16. On the outer periphery of the upper punch 2, a plurality of sharp edges 16 as cutting blades are arranged on a tapered inclined surface. As the descent is continued, cutting is sequentially performed, and an initial crack is generated at the tip of the sharp edge to form a molded product. It releases stress and prevents cracks from occurring and developing in other parts, and because there is little cutting allowance at multiple edges,
Since no tensile stress acts, no large cracks occur. Furthermore, in the last cutting edge, the hydraulic bias cylinder 1
Since the cutting is performed while sandwiching the edge of the product 9 with the lower punch 6 supported by 3, the product 9 can be cut without cracks. The control of the pinching force of the lower punch 6 supported by the hydraulic bias cylinder 13 can be controlled by a device (not shown).

After the cutting, when the hydraulic vibration cylinder 12 is raised, the upper punch 2 and the product holder 4 are raised. Furthermore, after taking out the product 9, the hydraulic bias cylinder 13
And the sprue 10 is taken out to terminate the gate cutting.

[0009] By adding a minute vibration reciprocating motion to the punching, the cutting gradually proceeds, so that the punching can be performed with cracks suppressed more. Further, while the upper punch 2 is slightly vibrated through the hydraulic vibration cylinder 12, the cutting surface of the upper punch 2 is brought into contact with the cut surface for a short time after the cutting to rub the cut surface, thereby further cutting the gate cut surface. Can be finished neatly. The vibration of the upper punch may give a gentle reciprocating motion for a short time.

[0010]

According to the structure of the present invention, in order to suppress cracks in the cut portion, the tip of the tool is made to have a sharp edge to reduce the contact surface between the molded product and the tip of the tool, thereby concentrating the stress and thereby sharpening the edge of the sharp edge. Initial cracks occur to release the stress of the molded product, prevent cracks from occurring and spreading in other parts, and provide a plurality of cutting edges with sharp edges at the top of the upper punch on the inclined surface to gradually increase the gate In order to prevent the tensile stress from acting on the product by cracking, cracks are generated and further prevented from developing, and the last sharp edge sandwiches the product edge with the lower punch from above and below, so that cracks are formed in the product part The present invention provides a method and an apparatus for punching out a gate portion which does not occur and solves the problems of the prior art. Furo portion cutting unnecessary machining after deburring, etc., it is possible to not pressing crack,
The processing time is short, the product accuracy is stable, and the production cost is reduced, which is suitable for mass productivity. Preferably, the vibration punching eliminates the necessity of performing a finishing process such as a grinder finishing, so that the working time is short, and a very clean atmosphere is provided.

[Brief description of the drawings]

FIG. 1 shows a gate section cutting apparatus in which a gate section cutting method according to an embodiment of the present invention is used.

[Explanation of symbols]

1 Gate 2 Upper Punch 3 Upper Die 4 Product Holder 5 Product Holder Hole 6 Lower Punch 7 Lower Die 8 Lower Die Hole 9 Product (Molded Product) 10 Sprul 11 Runner 12 Hydraulic Vibration Cylinder 13 Hydraulic Bias Cylinder 14 Product Holding cylinder 15 Movable plate 16 Cutting blade

────────────────────────────────────────────────── ─── Continued on the front page (51) Int.Cl. ⁶ Identification code FI B23P 13/02 B23P 13/02 // B23D 79/00 B23D 79/00 A

Claims (6)

[Claims] 1. A molded product is fixed to a lower mold by a product press supported vertically by an upper mold, and the upper mold is moved to cut a gate, cut an overflow portion, and remove burrs (hereinafter referred to as deburring). Gate portion punching device), the upper portion having an inclined surface which is slidable in the vertical direction, is fixed to the upper die, and has a plurality of gate cutting sharp edges formed thereon. A gate portion comprising: a punch; and a lower punch which sandwiches a punched product gate between the upper punch and the upper punch and is supported by the upper punch via the gate so as to be driven / synchronized with the upper punch. Punching equipment. 2. The gate part punching apparatus according to claim 1, wherein instead of forming the plurality of sharp edges on the inclined surface, electrodeposited abrasive grains are formed. 3. A molded product is fixed between the lower mold and the upper mold by means of a product retainer supported in a vertically movable manner, and the upper mold is moved to perform gate cutting, overflow section cutting, and deburring. In the method of punching a gate portion, an upper punch provided with an inclined surface fixed to an upper mold and formed with a plurality of sharp edges for cutting and cutting a gate, the upper punch being slidable in the vertical direction, and And a lower punch that is pressed and supported upwardly and synchronously with the upper punch via the gate so as to be driven / synchronized with the upper punch or the lower punch. A gate portion punching method characterized by cutting gates, overflows, and burrs by displacing. 4. The method according to claim 3, wherein an upper punch formed with electrodeposited abrasive grains is provided instead of forming the plurality of sharp edges on the inclined surface. 5. A method for punching a gate portion, wherein the upper punch and / or the lower punch according to claim 3 or 4 is punched by applying a minute vibration. 6. A method of punching a gate portion, wherein a gentle reciprocating motion is applied for a short time after punching the upper punch / lower punch according to claim 3 or 4.