JP3378191B2 - Gate punching method and apparatus - Google Patents

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art Conventionally, an aluminum alloy and a magnesium alloy can be formed in a short time of 20 to 40 seconds (a very brittle material having an elongation of about 3%), but the gate cutting of the post-processing of the formed product. The cutting of the overflow portion and the deburring were performed by punching with a press die, leaving 0.5 to 1.0 mm as a finishing allowance for the product portion, and then finishing with a grinder. The overflow part and burr adhere to the sprue part, the runner part, the gate and the product.

[0003]

Therefore, there is a problem that the process has two steps of molding and deburring, and it takes a long time to finish because of the grinder work, and there is also a problem that the atmosphere is bad and the products vary. It was Instead, the end mill processing is also performed, but in the case of a fine pattern, the end mill diameter is small and the feed cannot be performed quickly, so that there is a problem that the cutting time is long and the productivity is poor and it 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 gate portion punching method and apparatus capable of performing gate cutting, overflow portion cutting, and deburring (hereinafter collectively referred to as gate portion punching) of a molded product by press working suitable for mass production.

[0004]

For this reason, according to the present invention, a molded product is fixed to a lower mold by a product retainer supported by an upper mold so as to be vertically movable, and the upper mold is moved to move the gate. In a gate punching device that enables cutting, cutting of an overflow portion, and deburring (collectively referred to as gate punching below), each is vertically slidable and fixed to an upper mold, and a sharp edge for cutting a gate. An upper punch having a plurality of inclined surfaces and a lower punch having a punched product gate sandwiched between the upper punch and the upper punch pressed and supported so as to be driven and synchronized with the upper punch via the gate. The problems of the prior art described above have been solved by providing a device and a method for punching a gate portion characterized by including:

Preferably, at least one of the upper punch and the lower punch is punched by applying minute vibration to the gate to gradually cut the gate, thereby preventing a large cutting stress and suppressing cracks. can, and after punching out, the upper punch sharp edge
The cut surface can be finished neatly by wrapping.

[0006]

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described in detail below with reference to the attached FIG. FIG. 1 shows a gate part cutting device in which a gate part cutting method showing a configuration of an embodiment of the present invention is used. Although FIG. 1 shows a case where the post-molding processing gate 1 on the inside of the product 9 which is a molded product is cut, the side gate part cutting for cutting the post-molding processing gate on the outside of the product 9 is also performed by the present invention. The same device as can be used. 10
Is a sprue portion, and 11 is a runner portion connecting the sprue portion 10 and the gate 1. The upper punch 2 forming a cutting tool device for the gate 1 is attached to the gate cutting position of the upper die 3, and an inclined surface formed with a plurality of sharp edges 16 for cutting the gate is provided on the outer periphery of the upper punch 2. It is slidably inserted in the hole 5 in the vertical direction. Lower punch 6
Is located at a position facing the upper punch 2 and
The punched product gate 1 is sandwiched between
It is pressed and supported by a hydraulic bias cylinder 13 in an upward direction so as to be driven / synchronizable 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 slightly, the lower punch also vibrates slightly. The upper punch 2 is supported by the hydraulic vibration cylinder 12 via the upper mold 3 and the movable plate 15. The product pressing cylinder 14 is supported by the movable plate 15 and the hydraulic vibrating cylinder 12 so as to be vertically movable, and holds the product 9 between the product pressing cylinder 14 and the lower die 7 via the product pressing member 4. Instead of the hydraulic bias cylinder 13, the lower punch may be supported by a spring or urethane having elasticity.

A method of cutting the gate portion according to the present invention will be described. When the hydraulic oscillating cylinder 12 is lowered by a device (not shown), the product retainer 4 supported by the product retainer cylinder 14 clamps the product 9 with the lower die 7 fixed on the press base. The clamping force can be controlled by a device (not shown). When the hydraulic vibrating cylinder 12 is further lowered after being clamped by the product retainer 4, the upper punch 2 is lowered, and the gate 1 is gradually cut by the sharp edge 16. On the outer circumference of the upper punch 2, a plurality of sharp edges 16 which are cutting edges are arranged in a tapered inclined surface, and when the descent is continued, the cutting is sequentially performed, and an initial crack is generated at the sharp edge tip to form a molded product. Relieves stress to prevent cracks from developing and propagating to other parts, and multiple edges reduce cutting allowance,
It does not become a large crack because the tensile stress does not work. Furthermore, at 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 clamping force of the lower punch 6 supported by the hydraulic bias cylinder 13 can be controlled by a device (not shown).

After cutting, when the hydraulic vibration cylinder 12 is raised, the upper punch 2 and the product retainer 4 are raised. Further, after taking out the product 9, the hydraulic bias cylinder 13
Is raised to take out the sprue 10 to complete the gate cutting.

By applying a minute vibration reciprocating motion to the above-mentioned punching, the cutting progresses gradually, so that the punching with more suppressed cracks can be performed. Furthermore, while slightly vibrating the upper punch 2 via the hydraulic oscillating cylinder 12, the cutting edge surface of the outer periphery of the upper punch 2 is rubbed against the cutting surface after being cut for a short time, thereby further cutting the gate cutting 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 tool tip is made to be a sharp edge so that the contact surface between the molded product and the tool tip is made small to concentrate stress and sharp edge tip. The initial crack is generated to release the stress of the molded product to prevent cracks from developing and propagating to other parts, and multiple cutting edges with the sharp edge of the upper punch tip are provided on the inclined surface to gradually form the gate. Punching to prevent the tensile stress from acting on the product to further prevent cracks from occurring and developing, and the final sharp edge sandwiches the product edge from the top and bottom with the lower punch, so cracks occur in the product. The present invention provides a method and apparatus for punching out a gate portion that 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 was short, the product accuracy was stable, and the manufacturing cost was reduced, making it suitable for mass production. Preferably, vibration punching eliminates the need for finishing such as grinder finishing, which shortens the working time and creates a very clean atmosphere.

[Brief description of drawings]

FIG. 1 shows a gate cutting device in which a gate cutting method showing a configuration of an embodiment of the present invention is used.

[Explanation of symbols]

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

Front page continuation (58) Fields surveyed (Int.Cl. ⁷ , DB name) B23D 15/02 B23D 33/00 B23D 35/00

Claims (4)

(57) [Claims] 1. A molded product is fixed between a lower mold and a lower product by a product holder supported by an upper mold so as to be vertically movable, and the upper mold is moved to cut a gate, cut an overflow portion, and deburr (hereinafter In the gate punching device, which is capable of collectively performing gate punching), an upper side that is slidable in the vertical direction and is fixed to the upper die and has a plurality of sharp edges for cutting the gate. A gate unit, comprising: a punch; and a lower punch, which sandwiches a punched product gate between the punch and the upper punch, and which is pressed and supported in an upward direction so as to be driven and synchronized with the upper punch via the gate. Punching device. 2. A molded product is fixed between a lower mold and a molded product by a product holder supported by an upper mold so as to be vertically movable, and the upper mold is moved to cut a gate, cut an overflow portion, and deburr (hereinafter In the method of punching the gate portion, the slanted surface fixed to the upper mold and having a plurality of sharp edges for cutting the gate is provided. The upper punch, and a lower punch that sandwiches a punched product gate between the upper punch and the upper punch, and is pressed and supported upward by the gate so as to be driven and synchronized with the upper punch. And a gate punching method, wherein at least one of the lower punch and the lower punch is forcibly displaced to cut the gate, the overflow, and the burr. 3. The method according to claim 2, wherein at least one of the upper punch and the lower punch is punched by applying a minute vibration. 4. The punching of the gate portion according to claim 2 or 3 , wherein a gentle reciprocating motion is applied for a short time after punching at least one of the upper punch and the lower punch. Method.