JPH11138595A - Gate cutting device for synthetic resin molding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a gate to be efficiently and rapidly cut by arranging a gate cutting member on the arm part of a multi-axis robot. SOLUTION: A cylinder 2a for actuating a cutter is mounted on the arm part 1a of a multi-axis robot, and projecting pieces 2a' are extended at a specified interval, in the vertical direction, on the tip of the cylinder 2a. Besides, into a pin 2b fitted to each of the projecting pieces 2a', is introduced a hole bored in each of the base parts of paired cutter pieces 2c' which form a scissors- like cutter 2. Further, the cutter 2c is actuated centered around the pins 2b by moving a piston rod on the cylinder 2a for cutter actuation and thereby, the scissors-like cutter pieces 2c' can be opened/closed. Under this construction, a gate scattering stopper 2d is arranged at the tip of the arm part 1a of the multi-axis robot in such a way that the lower end of the stopper 2 is positioned above the blade part 2c" of the cutter 2c.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION When a synthetic resin molded product is injection-molded, a flow path for guiding a molten resin into a mold is formed as a projection, that is, a gate. The present invention relates to an apparatus for cutting a gate of a synthetic resin molded product for cutting a gate formed on the resin molded product.

[0002]

2. Description of the Related Art Conventionally, there has been known a gate cutting apparatus for a synthetic resin molded product in which a gate formed on the synthetic resin molded product is cut by a scissor-like cutter.

[0003]

In the above-mentioned conventional apparatus for cutting a gate of a synthetic resin molded article, there is a problem that the gate cut by the cutter is scattered, and it takes time and labor to clear the scattered gate. there were.

In the case where the synthetic resin molded article is made of a foamed resin, immediately after cutting the gate,
When the cutter is separated from the cut end of the gate, the molten resin inside the synthetic resin molded product is still foaming, so that the molten resin flows out of the cut end of the gate, and a protrusion similar to the gate is formed. In order to prevent the formation of such protrusions, the cutter must be pressed against the cut of the gate until the cut of the gate cools and the molten resin does not flow out of the cut of the gate, Therefore, there is a problem that it takes time to cut the gate and that the cooling time of the gate opening varies depending on the location of the gate, so that it is difficult to set the pressing time of the cutter to the gate opening. Was.

An object of the present invention is to solve the problems of the above-mentioned conventional apparatus for cutting a gate of a synthetic resin molded product.

[0006]

According to the present invention, in order to achieve the above-mentioned object, first, an arm of a multi-axis robot is provided with:
Secondly, a gate cutting member is provided, and secondly, a gate scattering prevention body is provided above the cutter,
A gate housing is provided above the gate shatterproof body, and a shutter is provided between the gate shatterproof body and the gate housing body and above the gate housing body. After the gate is cut, the next gate is cut without waiting for the gate opening to cool down.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, as an embodiment of the present invention, a case where a synthetic resin molded product is a pallet will be described. However, the present invention is not limited to a pallet unless it exceeds the gist of the present invention.

Reference numeral 1 denotes a multi-axis robot. The arm 1a of the multi-axis robot 1 is provided with a gate cutting member 2 described later. P is a pallet as a synthetic resin molded product immediately after molding, and a plurality of gates p are provided on the surface of the pallet P.
1 is formed. The pallet P is placed on a transport device 3 such as a roller conveyor.

Next, the gate cutting member 2 arranged on the arm 1a of the multi-axis robot 1 will be described.

Reference numeral 2a denotes a cutter operating cylinder attached to the arm 1a of the multi-axis robot 1. A protruding piece 2a 'is provided at the tip of the cutter operating cylinder 2a at a predetermined interval in the vertical direction. Is extended, and the projecting piece 2
A hole drilled at the root of a pair of cutter pieces 2c 'forming the scissor-like cutter 2c is inserted into the pin 2b attached to a'. By moving the piston rod of the cylinder 2a for operating the cutter forward and backward, the cutter 2c is operated around the pin 2b, so that the scissor-like cutter piece 2c 'can be opened and closed.

Reference numeral 2d denotes a gate scatter prevention member which is the tip of the arm portion 1a of the multi-axis robot 1 and whose lower end is located above the blade portion 2c "of the cutter 2c.
“d” is formed in a tubular shape having openings 2d ′ and 2d ″ on the upper and lower sides. 2e is a tip of the arm 1a of the multi-axis robot 1 and is attached above the gate scattering prevention body 2d. The gate housing 2e is also formed in a cylindrical shape having upper and lower openings 2e 'and 2e ", similarly to the gate scattering prevention body 2d. And the gate scatter prevention body 2d
Upper opening 2d "and lower opening 2e 'of gate housing 2e.
Is configured so that the openings face each other.

Reference numeral 2f denotes a first shutter disposed between the upper opening 2d "of the gate shatterproof body 2d and the lower opening 2e 'of the gate housing 2e.
Upper opening 2d "and lower opening 2e 'of gate housing 2e.
And both can be opened and closed. The end of the first shutter 2f is connected to the pivot rod 2 of the first pivot cylinder 2g disposed at the tip of the arm 1a of the multi-axis robot 1.
g '. Reference numeral 2h denotes a second shutter configured to be able to open and close the upper opening 2e ″ of the gate container 2e, and an end of the second shutter is similarly disposed at the tip of the arm 1a of the multi-axis robot 1. It is attached to a rotation rod 2i 'of a two rotation cylinder 2i.

Next, the operation of the apparatus for cutting a gate of a synthetic resin molded article having the above-described structure will be described.

The gate p1 formed on the surface of the pallet P
Is located between the pair of cutter pieces 2c 'of the scissor-like cutter 2c and is located within the gate scatter prevention body 2d provided on the arm 1a of the multi-axis robot 1. Control. In this state, the first rotating cylinder 2g and the second rotating cylinder 2i are appropriately
By controlling the first shutter 2f, the gate
d upper opening 2d "and gate housing 2e lower opening 2
e ′ is closed, and the second shutter 2h is
The upper opening 2e ″ of the gate container 2e is configured to be closed. In such a state, the cutter operating cylinder 2a is operated to abut the cutting edges of the cutter pieces 2c ′ of the scissor-like cutter 2c. In contact with, the gate p1 formed on the surface of the pallet P is cut, the cut gate p1 is housed in the gate scattering prevention body 2d, and the cutting edges of the cutter pieces 2c 'of the cutter 2c are kept in contact. The cut gate p1 is configured not to fall from the lower opening 2d 'of the gate scattering prevention body 2d.

Next, as shown by the two-dot chain line in FIG. 1, the arm 1a of the multi-axis robot 1 is moved so that the gate scatter prevention body 2d is positioned above the gate housing 2e.
Rotate 0 degrees. After that, the first rotating cylinder 2g is operated, and the first rotation cylinder 2g is disposed between the upper opening 2d ″ of the gate anti-scattering body 2d and the lower opening 2e ′ of the gate housing 2e.
By rotating the shutter 2f, the gate shatterproof body 2d communicates with the gate shatterproof body 2e and the gate shatterproof body 2d.
Is dropped into the gate housing 2e. After the cut gate p1 is housed in the gate housing 2e, the first rotating cylinder 2g is operated, and the gate shutter preventing body 2d is operated by the first shutter 2f.
Upper opening 2d "and lower opening 2e 'of gate housing 2e.
Are closed, and the cutter operating cylinder 2a is operated to open the cutter piece 2c 'of the scissor-like cutter 2c for the next gate p1 cutting operation.

As described above, the gate p1 formed on the surface of the pallet P is cut. After the predetermined gate p1 cutting operation is completed, the multi-axis robot 1 is controlled to control the gate cutting member 2 provided on the arm 1a of the multi-axis robot 1.
Is placed above a dust box (not shown). Next, the gate container 2 e is
d, the multi-axis robot 1 is controlled, and the second rotating cylinder 2i is controlled to rotate the second shutter 2h, thereby controlling the upper opening 2 of the gate housing 2e.
e "is opened, and the gate p1 housed in the gate housing 2e falls into the dust box and is housed.

In the present invention, as described above, after the gate p1 formed on the surface of the pallet P is positioned in the gate scattering prevention body 2d, the gate p1 is cut by the scissor-like cutter 2c. Since the cut gate p1 is not scattered, the cut gate p1 housed in the gate housing body 2e is
The first shutter 2f and the second shutter 2h are appropriately
By activating, the dust box is accommodated in the dust box, so that the operation of clearing the cut gate is simplified.

In the present invention, even when the pallet P is made of a foamed resin, the cutter 2c is not pressed against the cut of the gate p1 until the cut of the gate p1 is cooled. The multi-axis robot 1 is immediately activated to cut the next gate p1. After the gate p1 is cut, the molten resin flows out of the cutout of the gate p1, and again the gate p1
In the case where a projection such as 1 is formed, the multi-axis robot 1 is appropriately controlled to cut the projection again, so that it is also necessary to press the cutter 2c against the cut opening of the gate p1. Further, there is no need to control the setting of the pressing time of the cutter 2c in consideration of the cooling time of the cutting opening of the gate p1.

Further, when the pallet P is made of a foamed resin, the diameter of the gate is set to be large in order to promote the expansion ratio. Therefore, there are cases where the gate p1 cannot be completely cut by one operation of the cutter 2c. is there. In such a case, the cutter 2c is operated a plurality of times to set the gate p1.
Disconnect. In particular, after the first operation of the cutter 2c, the multi-axis robot 1 is appropriately controlled to
Is rotated by a predetermined angle, for example, 90 degrees on a horizontal plane, and 1
By performing the second cutter 2c operation while changing the angle with the second cutter 2c operation, the gate p1 can be reliably cut by the second cutter 2c operation.

[0020]

Since the present invention has the above-described structure, the following effects can be obtained.

Since the gate cutting member is provided on the arm of the multi-axis robot, the gate cutting operation can be performed efficiently and quickly.

Since the cut gates are not scattered, the work of clearing the scattered gates can be omitted.
The workability of the gate cutting work is improved.

In addition to shortening the gate cutting time, the conventional gate cutting device for synthetic resin moldings has
Eliminates the need to set the time for pressing the cutter against the gate cut.

By changing the angle with the first operation of the cutter,
Since the second cutter operation is performed, the gate can be reliably cut by the second cutter operation.

[Brief description of the drawings]

FIG. 1 is a front view of an apparatus for cutting a gate of a synthetic resin molded product according to the present invention.

FIG. 2 is a perspective view of a main part of a gate cutting device for a synthetic resin molded product according to the present invention.

FIG. 3 is a front view of a main part of a gate cutting device for a synthetic resin molded product according to the present invention.

[Explanation of symbols]

 P ······ Pallet as a synthetic resin molded product p1 ····· Gate 1 ····· Multi-axis robot 1a ········ Arm 2 ... Gate cutting member 2d Gate shatterproof body 2e Gate container

Claims (4)

[Claims] 1. A gate cutting device for a synthetic resin molded product, wherein a gate cutting member is provided on an arm of a multi-axis robot. 2. A gate scatter prevention body is provided above the cutter, and a gate housing body is provided above the gate scatter prevention body, and between the gate scatter prevention body and the gate housing body and the gate housing. 2. A gate cutting device for a synthetic resin molded product according to claim 1, wherein a shutter is provided above the body. 3. The synthetic resin molding according to claim 1, wherein after the gate is cut by the cutter, the next gate is cut without waiting for cooling of the gate cutout. Gate cutting equipment. 4. The first cutter operation and changing the angle,
The apparatus for cutting a gate of a synthetic resin molded product according to any one of claims 1 to 3, wherein a second cutter operation is performed.