JPH06143188A - Gate cut device - Google Patents

Abstract

PURPOSE:To provide a gate cut device which is designed to smooth a cut surface, reduce the remaining size of a gate to a low value, and reduce the occurrence of unevenness in a gate cut size. CONSTITUTION:A gate cut device 11 is designed to cut a molded prod coupling body 4 at a gate 2 and have recessed parts 18 and 19 in which the molded prod part 3 of the molded prod coupling part 4 is contained. The gate cut device comprises a positioning block 6 designed to arrange the molded prod coupling body 4 such that a part between molded prods 3 and 3 fronts on a groove 17; a press member 20; and a cutting device 22 formed such that it is raised from a position below the groove 17 and has cutting blades 23 and 24 energized in a direction in which the cutting edges thereof are spaced away from each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gate cutting device for cutting at a gate a molded product connecting body in which desired molded product portions are connected to both sides of a runner via gates.

[0002]

2. Description of the Related Art For example, in a molded product obtained by injection molding of synthetic resin, as shown in FIG. 2, target molded product parts 3 and 3 are formed on both sides of a runner 1 through gates 2 and 2. It is connected. From this molded product connecting body 4, to the molded product part 3
In order to obtain, conventionally, a portion shown by an arrow A in FIG.
That is, the connecting portion between the gate 2 and the molded product portion 3 was manually or automatically cut using an air nipper.

As another method, a method using the cutting device 5 shown in FIG. 3 has also been adopted. In the method using the cutting device 5, the molded product connected body 4 is arranged on the die 6, and the molded product connected body 4 is pressed against the upper surface of the die 6 by the stripper 7, and in that state, the punch 8 is moved in the direction of the arrow. By lowering, the molded part 3 and the gate 2 were cut and separated.

[0004]

However, in the conventional method using the air nipper, it is difficult to position the air nipper at the position indicated by the arrow A, and therefore, a part of the gate is likely to remain on the side surface of the molded product portion 3. It was Further, the size of the gate portion remaining on the side surface of the molded product portion 3 had to vary considerably. In addition, since the cutting is performed with an air nipper, there is a problem that the cut surface is difficult to be smooth.

Further, in the cutting method using the cutting device 5,
Since the punch 8 is lowered, a clearance is required between the punch 8 and the die 6. Therefore, the gate portion had to remain on the side surface of the obtained molded product portion 3 by the amount of the above clearance. Further, there is a possibility that part of the gate 2 may come off when it is cut by the punch 8. In addition, since a clearance must be provided between the punch 8 and the die 6, there is a problem that the cut surface cut by the punch 8 is not smooth as in the case of using the air nipper.

An object of the present invention is to provide a gate cutting device which has a small gate residue in a molded product portion, can reduce variations in gate cut dimensions, and can smooth a cut surface.

[0007]

DISCLOSURE OF THE INVENTION The present invention is a gate cutting device for cutting at a gate a molded product connecting body in which a desired molded product portion is connected to both ends of a runner through a gate, At least a pair of recesses for accommodating the molded product portion of the molded product connected body, and a groove formed between at least a pair of the recessed parts, between the at least one pair of recessed parts of the pair of molded product connected body A positioning block for arranging the molded product connected body so that the molded product parts are bridged, and a positioning block for preventing the molded product connected body arranged in the positioning block from rising during cutting. A pressing member arranged so as to be close to and away from each other, and a pair of cutting blades urged in a direction in which their blade edges move away from each other, and in the groove of the positioning block. And a cutting device arranged so that the cutting edge is moved along a pair of side faces that are opposed to each other and in which the concave portion is formed at the upper end or the lower end. is there.

[0008]

In the gate cutting device of the present invention, the cutting edges of the pair of cutting blades of the cutting device are urged in directions away from each other, and are moved along the pair of side faces facing each other of the groove of the positioning block. It is configured. Moreover, since the molded product connected body is arranged so that the molded product portion is housed between at least a pair of recesses, the cutting edges of the pair of cutting blades of the above cutting device are set to the desired shape of the gate of the molded product connected body. The position is reached exactly.

Further, the cutting edge of the cutting blade is configured to be moved along a pair of side surfaces facing each other of the groove of the positioning block, and the cutting edge reaches a part of the gate of the molded product connecting body. ， Disconnect the gate. That is, the pair of cutting blades of the cutting device cuts the gate as if the object were cut with a cutting tool. Therefore, the cut surface of the gate can be a smooth surface.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be clarified by describing embodiments of the present invention with reference to the drawings. Figure 1
FIG. 4 is a partially cutaway cross-sectional view showing a state in which a molded product connecting body is arranged in the gate cutting device according to the embodiment of the present invention. The gate cutting device 11 includes a fixed plate 13 fixed to the posts 12a and 12b, and a moving plate 14 configured to be movable up and down along the posts 12a and 12b.
Have and. The vertical movement of the moving plate is performed by the air cylinder 15.

The fixed plate 13 includes the fixed plate 13
The positioning block 16 is configured integrally with the above. The positioning block 16 has a groove 17 as shown in FIG.
A pair of positioning block halves 16 facing each other
a and 16b. Positioning block halves 16a, 1
6b is integrated with the fixed plate 13 shown in FIG. However, the positioning block halves 16a, 16b
May be separately formed with the groove 17 interposed therebetween.

On the upper surfaces of the positioning block halves 16a and 16b, recesses 18 and 19 for accommodating the desired molded product portion 3 of the molded product coupling body 4 shown in FIG. 2 are respectively provided.
Are formed. The recesses 18 and 19 are formed in such a size that the molded product portion 3 is housed in the state where the molded product connected body 4 shown in FIG. 2 is placed on the positioning block 16.

Further, preferably, as shown in FIG. 4B, in order to facilitate the storage of the molded product portion in the recess 18,
The inclined surface 18a may be formed in a portion opened above the concave portion 18. Returning to FIG. 1, the molded product connecting body 4 is arranged so that the molded product portion 3 is housed in the above-described recess on the upper surface of the positioning block 16.

The distance between the pair of side surfaces 16c and 16d facing each other through the groove 17 is substantially equal to the distance between the inner side surfaces of the molded product portions 3 and 3. Positioning block 16
A pressing block 20 as a pressing member is arranged above the. The holding block 20 is provided to prevent the molded product connecting body 4 arranged on the upper surface of the positioning block 16 from floating during cutting. Therefore, as shown in FIG. 9, the pressing block 20 is configured not to apply a pressing force to the upper surfaces of the molded product parts 3 and 3 even when the pressing block 20 is in contact with the positioning block 16. The presser block 20 is the positioning block 16
It is connected to the moving means 21 so that it can be moved upward from above.

Below the positioning block 16,
A cutting device 22 is arranged on the moving plate 14.
The cutting device 22 has a pair of cutting blades 23 and 24. FIG. 5 is a perspective view showing the main part of this cutting device 22. Cutting device 2
2 has a pair of cutting blades 23, 24, and the cutting blades 23, 2
4 is a connecting pin 2 on the side opposite to the cutting edges 23a, 24a.
They are connected by 5. That is, the cutting blades 23, 24
Are rotatably connected to each other via a connecting pin 25. Further, the cutting edges 23a, 24
a is urged in a direction away from each other.

As shown in FIG. 1, the cutting device 2
2 has a holder 22a. The holder 22a is
As shown in FIG. 6, the cutting edges 23 of the cutting blades 23, 24
a, 24a moving away, that is, the cutting blades 23, 24
Are provided to prevent the V-shaped opening. The cutting blades 23 and 24 are surrounded by the holder 22a so as to be movable in the vertical direction with respect to the holder 22a.

Next, the process of cutting the gate by the gate cutting device 11 of the above embodiment will be described with reference to FIGS. First, as shown in FIG. 6, the molded product connected body 4 is arranged on the positioning block 16. In the initial state,
The cutting device 22 is located below the positioning block 16.

Next, as shown in FIG. 7, the presser block 2
0 is brought into contact with the upper surface of the positioning block 16 to prevent the molded product connecting body 4 arranged on the upper surface of the positioning block 16 from rising during cutting. Next, as shown in FIG. 8, the cutting device 22 is lifted in the arrow direction from below.

As this rises, the holder 22a penetrates into the through hole 13a of the fixed plate 13. However,
The holder 22a is lifted up by the positioning block half body 16
It is stopped by coming into contact with locking surfaces 16e, 16f formed to extend laterally at the lower end of the groove 17 of a, 16b. In the above cutting device 22, cutting blades 23, 24
Is further raised as shown in FIG. 9 even after the holder 22a stops rising.

Then, as shown in FIG. 10, the cutting blade 2
When the holders 22a are stopped and the blades 3 and 24 are further moved upward, the blade edges 23a and 24a,
a is moved in the direction of arrow B. As a result, the cutting blade 23,
The blade edges 23a, 24a of 24 slide along the side surfaces 16c, 16d facing each other via the groove 17.

Further, since the cutting blades 23 and 24 are urged in the direction of arrow B, when they reach the recesses 18 and 19, they abut against the inner side surfaces of the molded product portions 3 and 3 of the molded product coupling body 4. To be done. That is, since the molded product connecting body 4 is not pressed by the pressing block 20, it is in a state of being movable in the lateral direction, so that the cutting blades 23, 24 are brought into contact with the inner side surfaces of the molded product parts 3, 3. Then, the molded product connected body 4 is moved in the lateral direction. Therefore, the gate 2 is surely cut at the portion that is separated from the center of the molded product connecting body 4 by a certain distance. Therefore, variations in remaining gate size can be effectively reduced. Further, since the cutting blades 23 and 24 are biased as described above, the gate 2 is reliably cut along the side surfaces of the molded product portions 3 and 3. Moreover, the cutting blade 2
Since it is cut by 3, 24, the cut surface of the gate 2 can be a smooth surface.

The cutting blades 23, 24 are urged by springs so that the blade edges thereof move away from each other, but in order to urge the blade edges away from each other, another force such as an air cylinder is used. Means may be used. Further, in the above-described embodiment, the cutting device 22 is provided from below the positioning block 16.
Although the gate is cut by raising the position, the cutting device 22 may be placed above the positioning block and the cutting device 22 may be lowered from above to cut the gate 2 of the molded product connected body 4.

[0023]

According to the present invention, a pair of cutting members, in which the molded product connecting body is arranged on the positioning block, are fixed to the position by the pressing portion body and are urged so that the blade edges thereof are separated from each other. The cutting operation is performed by the cutting device having a blade such that the cutting blade moves along the opposite side surfaces of the groove of the positioning block. Therefore, it is possible to reduce variations in the remaining dimension of the gate and to smooth the cut surface.

Further, since the pair of cutting blades are urged so that the blade edges thereof are distant from each other as described above, and the cutting blades can also perform positioning of the molded product connecting body, the molded product is connected to the positioning block. It is not necessary to perform positioning with high accuracy when the body is thrown in.

Further, after cutting, the target molded product part remains in the recess of the positioning block, so that it can be used as it is as a holder for carrying the positioning block to the next step.

[Brief description of drawings]

FIG. 1 is a partially cutaway sectional view showing a schematic configuration of a gate cutting device according to an embodiment.

FIG. 2 is a perspective view showing a connected product.

FIG. 3 is a sectional view showing an example of a conventional gate cutting device.

4A and 4B are a perspective view showing a main part of a positioning block and an enlarged perspective view showing a preferable example of a recess, respectively.

FIG. 5 is a perspective view showing a main part of the cutting device.

FIG. 6 is a cross-sectional view showing a step of introducing a molded product connected body in the cutting device of the embodiment.

FIG. 7 is a cross-sectional view showing a state in which a pressing member is brought into contact with a molded product connected body.

FIG. 8 is a cross-sectional view showing a step of raising the cutting device in the gate cutting device of the embodiment.

FIG. 9 is an enlarged partial cutaway sectional view for explaining a step of raising a cutting blade.

FIG. 10 is a partially cutaway enlarged sectional view showing a step of cutting a gate with a cutting blade.

FIG. 11 is a partially cutaway enlarged cross-sectional view showing a state in which the gate is cut by the cutting blade.

[Simple explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Runner 2 ... Gate 3 ... Molded product part 4 ... Molded product connection body 11 ... Gate cutting device 16 ... Positioning block 16c, 16d ... Side surface 17 ... Groove 22 ... Cutting device 22a ... Holder 23, 24 ... Cutting blade 23a, 24a ... blade

Claims (1)

[Claims] 1. A gate cutting device for cutting a molded product connecting body in which a target molded product portion is connected to both sides of a runner through a gate at the gate, wherein the molded product of the molded product connected body is formed. And a groove formed between the at least one pair of recesses, and a portion between the pair of molded product portions of the molded article connection body is hooked between the at least one pair of recesses. A positioning block for arranging the molded product connected body so as to be passed over, and to prevent lifting of the molded product connected body arranged on the positioning block A pressing member arranged and a pair of cutting blades that are urged in a direction in which their blade edges move away from each other, and a pair of side surfaces facing each other in the groove of the positioning block, A gate cutting device, comprising: a cutting device arranged such that the cutting edge moves along a pair of side surfaces formed with the concave portion at the upper end or the lower end.