JPH05131507A - Gate cutting method for injection molded product and its device - Google Patents

Abstract

PURPOSE:To determine the cutting position simultaneously with the first delivery of a molded product before gate cutting in the gate cutting of the molded product, shorten the process and eliminate defective cutting. CONSTITUTION:When a molded product T released out of an injection molding machine is received from a releasing hand 5, the molded product is placed on a pan 6 on which a dropping section S provided with a positioning space S1 formed on its bottom face by means of positioning plates 9, 9, 10, 10. After that, the molded product T is grasped by a chuck 3 and carried to the cutting position to carry out gate cutting by air nippers 14. A separate mechanism for positioning necessary heretofore is not required any more by said arrangement to shorten the process and increase the working efficiency of a device. Also, as the delivery is not limited as is when a sprue is used, proper gate cutting can be performed even for a molded product of being fragile in strength to expand the scope of application.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gate cutting method and apparatus for separating a sprue and a runner from a molded product taken out from an injection molding machine.

[0002]

2. Description of the Related Art In the conventional gate cutting method, after a molded product taken out from an injection molding machine is delivered to a gate cutting machine chuck (hereinafter referred to as a chuck) through a take-out machine hand, a positioning jig is used for positioning the cut. Using a tool, the runner of the product is brought into contact with the positioning jig by manual or automatic control to temporarily stop the chuck, hold the sprue of the product, and then perform gate cutting at the cutting position, or As an improved invention of the above apparatus, when the limit switch is interlocked with the positioning jig and the gripped product is moved to the final fixed position, the limit switch is actuated when the chuck comes into contact with the positioning jig to move the chuck in the chuck. To release the product grip, move the chuck forward without stopping, grip the product again at the proper position, and perform gate cutting It is known.

[0003]

In the conventional positioning and gate cutting processes described above, both of them receive the molded product taken out from the injection molding machine first by the chuck and then perform the positioning.
It is undeniable that the process of positioning → conveyance → gate cutting becomes complicated and time-consuming until the gate cutting. In particular, there are many problems during delivery of molded products,
There is a problem that the molded product take-out machine and the chuck may come into contact with each other to cause a failure, and there is a problem of variation in the gripping position of the chuck in the sprue. This point is because, after all, the sprues are first handed over to each other, so if the initial gripping position is not constant, it will have a large effect on the subsequent steps, leading to drop of the molded product during positioning and defective cutting. If the sprue of the molded product is short or is relatively soft, it is impossible to deliver the sprue by the above-mentioned prior art in which the sprue is gripped and delivered. In addition, since a positioning jig is newly used for positioning, an extra step is added at the time of positioning, and the gate cutting step is time-consuming and operationally troublesome. Hang on.

[0004]

In view of the above, the present invention considers the positioning at the time of first delivery of molded products, and is limited to the delivery of sprues to each other in a simple process without performing many steps as in the above-mentioned prior art. The present invention provides a method and an apparatus for appropriately delivering, positioning, and gate cutting a molded product without performing the gate cutting by receiving the molded product taken out from the injection molding machine, conveying it to the cutting position, and performing the gate cutting. In gate cutting of injection molded products, when receiving the molded product, after the molded product is once stored and positioned in a tray that can support the molded product in an appropriate delivery posture, the molded product is conveyed to the cutting position. The present invention relates to a gate cutting method for an injection-molded article for performing gate cutting by a gate and a gate cutting apparatus which embodies the method.

[0005]

[Function] When the molded product taken out from the injection molding machine is not directly received but once stored in the receiving tray, the molded product is supported in a proper delivery posture. There is no need to pick up again, and good gate cutting is always possible with a simple process.

[0006]

Embodiments of the present invention will now be described with reference to the drawings. Example 11 1 is a gate cutting device in an injection molding machine, which is a pair of lever chucks 3 protruding on the front surface of a table 2.
The chuck 3 driven by a motor provided with a and 3b can reciprocate in the X axis and the Z axis respectively, and the chuck 3 can move in the mounting axis direction (Y axis direction) and rotate ± 220 °. Further, only the rotating shaft 4 of the chuck 3 can be axially set and changed downward in a direction perpendicular to the Y-axis direction. Opening and closing operations of the lever chucks 3a and 3b are performed by a compressor (not shown) connected by an air hose and two solenoid valves for opening (ON) and closing (OFF) the chuck. A rectangular molded product tray 6 is provided in front of the chuck 3 at a receiving position P when the molded product T taken out from the injection molding machine is ejected by the ejector hand 5, and the received plate 6 is an upper base plate. 6a is attached to the lower base 6b with a mounting screw, and is rotated to the mounting base 2a of the table 2 with the tip 7 of the adjusting end 6c integrally projecting at the lower center of the base 6b as a fulcrum. The piston rod 8 is provided under the base 6b.
The angle of the tray 6 is set to be arbitrarily changeable by the air cylinder 8 in which a is linked. On the base plate 6a, a sprue T of a molded product T for gate cutting is formed.
Along the rectangular positioning space S ₁ occupied by the molded product T on the lowermost surface on the opposite side when ₁ is vertically directed upward, the short side,
Longitudinal plate-shaped positioning plates 9, 9 and 10, 1
0 indicates the attachment sides 9a, 9a and 10 to the base plate 6a, respectively.
a, 10a are fixed to the base plate 6a with adjusting screws 12, 12 ... Through adjusting holes 11, 11 ..., And the free end sides 9b, 9b, 10b, 10b of the plates are located in the positioning space. S ₁ is gradually expanded upward and is bent outward at the same angle to form a drop portion S. A discharge shooter 13 for discharging a molded product after gate cutting is provided diagonally forward of the tray 6, an air nipper 14 is provided above the discharge shooter 13, and a slide base 16 having a slide hole 15 in the center is provided therebetween. Are fixed by the slide bolts 16a, 16a and the back plate 16b so that the fixing position can be changed up and down.
In addition, the movable groove 17 provided in the table 2 in parallel with the X-axis direction of the chuck 3 is provided with elongated holes 17a and 17a provided on the base of the slide base 16, bolts 18 and 18, and a fixing plate 19 to fix the positions in the front, rear, left and right. It is changeably installed.
The table 2 is set to be movable up and down by a handle (not shown). The chuck 3 on the table 2, the air cylinder 8 for operating the tray 6 and the air nipper 14 are externally connected, and are automatically operated by a programmable teaching panel for operation. Controlled.

The gate cut device for an injection-molded product having the above-described structure firstly takes out the molded product T from the take-out machine hand 5.
The stand-by state of the tray 6 is set according to the swing-out angle. That is, in the case of a traverse type take-out machine which takes out the molded product and conveys it to the receiving position P in a horizontal state, the tray 6 is made to stand by in a horizontal state, and a swinging type take-out machine which shakes out the molded product and delivers it in an inclined state. Activates the air cylinder 8 in accordance with the inclination angle and causes the tray 6 to stand by in an inclined state. Then extraction machine hand molded article gripped sprue T ₁ by 5, it reaches the receiving position P solves the gripping of sprue T _1, dropping the molded article T on pan 6 (Figure 2). At this time, the molded product T is dropped as it is to the drop-in portion S formed by the positioning plates 9, 9, 10 and 10. However, if the molded product T is dropped so as to be exactly in the positioning space S ₁ , it is supported as it is. If the molded product T comes into contact with the free end sides 9b, 9b, 10b, 10b which are bent so as to expand outward from the positioning space S ₁ , even if the product T is slightly displaced and falls, the correction is made. Therefore, the molded product T is always supported at an appropriate position on the tray 6. Then, the tray 6 in the inclined state is returned to the horizontal state again by the air cylinder 8 (in the traverse type, the initial horizontal state is kept), and at the same time, the lever chucks 3a and 3b in the start position A are in the open state and in the receiving position. The chuck 3 that has advanced to P and reached the receiving position P
Is rotated downward, the chuck 3 is lowered with the chuck 3 facing downward, the electromagnetic valve for closing is activated by the chuck ON, air is output, the chuck 3 is closed, and the sprue T is always kept at a constant position. Hold ₁ (Fig. 3). And sprue T
_The chuck 3 holding ₁ returns to the horizontal state by the rotation of the rotary shaft 4 again. The chuck 3 holding the molded product T moves to the cutting position of the air nipper 14 and stops. However, the chuck 3 is already positioned at an appropriate position when it is first gripped on the tray 6, so that the air nipper 14 remains as it is. It operates and separates product T ₂ and runner T ₃ ,
The product T ₂ drops, is discharged from the discharge shooter 13, and the chuck 3 retracts. When the chuck is turned off, the solenoid valve for opening operates to open the lever chucks 3a and 3b, the sprue T ₁ and the runner T ₃ are released from gripping, and the sprue T ₁ and the runner T ₃ are discharged separately from the product T _2. Returns to the first start position A.

If the molded product is positioned and cut by the above-mentioned operation, the chuck gripping position of the sprue is already constant when the product is delivered from the unloader hand at the first time. The gate cutting and the process are shortened, and the above-mentioned problems due to the indefinite gripping position can be solved. Therefore, if you make a pan with a positioning plate for each molded product,
It is possible to cut gates of various molded products by simply changing the tray. Furthermore, if it is a molded product that can be stored in the saucer,
For example, since the sprue is not affected by properties such as softness and can be supported at an appropriate position at all times, after storing it in the tray, the runner or the product itself can be adjusted according to the shape and properties of the molded product. The chuck and the gate can be cut arbitrarily.

In the first embodiment, if the molded product is relatively soft in nature, there will be no problem at the time of delivery to the tray and positioning as described above, but the sprue and runner will have a certain degree of strength during cutting. Without,
Since the sprue or runner may bend due to the weight of the product and the cutting position may be incorrect and the cut surface may have a defect, a modified embodiment having a cutting means capable of solving the above problem will be described below. Embodiment 2 In FIG. 2 , those having the same drawing numbers as those in Embodiment 1 have the same configurations and functions as those described above, and therefore the description thereof will be omitted and a new cutting means will be described. In front of the tray 6, there is a flat plate slide shooter 20 having both end portions 20a, 20a standing upright, and a rotary end 21 at the bottom thereof is the table 2.
It is rotatably set by being pivotally supported by the support base 22 of the above, and the inclination angle can be arbitrarily changed by the air cylinder 24 to which the piston rod 23 is linked and coupled similarly to the base 6c below the receiving tray 6. It is set. A conveyor 25 for discharging the product is provided on the discharge side of the slide shooter 20 (on the right side in the figure), and on the opposite side of the conveyor 25 when the slide shooter 20 is in a horizontal state, a blade tip is provided from the slide shooter 20. The air nippers 26 are vertically fixed in the projected state.

In the gate cutting device constructed as described above, the receiving tray 6 receives the molded product T in the same manner as in the first embodiment, and the chuck 3 has the sprue T as shown in FIG.
The cutting edge 26a of the air nipper 26 while holding ₁
It stops at the upper position and descends as it is. And product T ₂
When the abutment contacts the longitudinal end portion 20b of the slide shooter 20, the runner T ₃ is bent due to insufficient strength.
The air nippers 26 that were open because they are horizontal
There sandwiching the runner T _3, when the closed cutting edge 26a by an air actuated, runners T ₃ the product T ₂ at the proper cutting position
Can be separated from. The sprue T _1, while the chuck 3 holding the runner T ₃ is moved, sprue T _1, but separately discharging runner T _3, the product T ₂ are left intact on the end 20b of the slide shooter 20.
After that, the end portion 20b on which the product T ₂ is placed rises due to the rising operation of the air cylinder 24, and the product T ₂ falls along the slope and is transferred onto the conveyor 25 and discharged. As described above, according to the second embodiment, in the case of a molded product in which the strength of the sprue and runner is weak, the slide shooter can be applied even when cutting and the molded product and the runner can be supported horizontally, so that the cut surface is stable and the gate is stable. The cut is always done properly.

In the above embodiment, it is needless to say that the positioning space S ₁ of the tray and the recess S can be arbitrarily changed according to the shape of the molded product for gate cutting. As for the number, for example, one rectangular parallelepiped may be provided with a recessed portion corresponding to a molded product, and trapezoidal positioning members may be arranged on four sides instead of a plate shape, or the number of positioning plates to be arranged may be set. The number is not limited to the above-described embodiment, such as increasing the number from 4 or decreasing the number from the opposite.

[0012]

As described above, according to the present invention, since the gate cuts can be positioned at the same time when the first molded product is delivered, a separate mechanism for positioning is unnecessary, and the process can be shortened as compared with the conventional apparatus. Uptime. Further, there is no influence on the variation in the position gripped by the unloader hand, and it is possible to cover the variation in the position when the mold of the molding machine, which is the previous step of the unloader hand, is opened. In addition, since it can be delivered without restriction to the gripped part of the molded product, it is not limited to the conventional delivery with only the sprue, and the delivery can be performed by grasping the runner or the product itself, and gate cutting can be performed. Even if the sprue, which cannot be delivered by the cutting device, has a weak strength, it can be handled by the above device, and the range of application to various molded products is increased.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a gate cutting device according to the first embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a state in which a molded product is delivered from a take-out machine hand to a tray in the first embodiment.

FIG. 3 is an explanatory view showing a state where the molded product is stored in the tray in the first embodiment.

FIG. 4 is an explanatory diagram showing a gate cutting device according to the second embodiment of the present invention.

FIG. 5 is an explanatory diagram showing a state in which a molded product is gate-cut in the second embodiment.

[Explanation of symbols]

1 ... Gate cutting device, 2 ... Table, 3 ... Chuck, 3a, 3b ... Lever chuck, 4 ... Rotating shaft,
5 ... Take-off machine hand, 6 ... Receiving tray, 6a ... Base plate, 6b ... Base, 6c ... Adjusting end, 7 ... Tip part,
8 ・ ・ Air cylinder, 9, 9, 10, 10 ・ ・ Positioning plate, 11, 11 ・ ・ Adjustment hole, 12, 12 ・ ・ Adjustment screw, 13 ・ ・ Ejection shooter, 14 ・ ・ Air nipper, 15 ・ ・ Slide Hole, 16 ... Slide base, 1
7 ・ 17 ・ ・ Long hole, 18, 18 ・ ・ Bolt, 19 ・ ・ Fixing plate, 20 ・ ・ Slide shooter, 21 ・ ・ Rotating end,
22 ・ ・ Supporting base, 23 ・ ・ Piston rod, 24 ・ ・ Air cylinder, 25 ・ ・ Conveyor, 26 ・ ・ Air nipper, P ・ ・ Receiving position, S ・ ・ Recessed part, S ₁・ ・
Positioning space, T ·· moldings, T ₁ ·· sprue,
T ₂ ··· products, T ₃ ··· runners.

Claims (3)

[Claims] 1. A gate cutting method for an injection-molded product, which receives a molded product taken out from an injection molding machine, conveys it to a cutting position, and performs gate cutting. A gate cutting method for an injection-molded product in which a molded product is once stored in a tray that can be supported in a delivery posture and positioned, and then the molded product is conveyed to a cutting position and gate-cut. 2. A gate cutting device for an injection molded product, which receives a molded product taken out from an injection molding machine, grips and conveys it to a cutting position, and performs gate cutting and discharge of the product, the receiving of the molded product. In order to support and position the dropped molded product in an appropriate posture, the above-mentioned molded tray is provided with a recessed portion having a bottom surface having a shape adapted to the desired surface of the molded product and an inclined wall surface in the periphery. A gate cutting device for an injection-molded product, wherein gripping means for gripping and transporting a molded product positioned on the tray is provided for gripping and transporting the product, respectively. 3. A gate cutting device for an injection molded product, which receives a molded product taken out from an injection molding machine, grips and conveys it to a cutting position, and performs gate cutting and product discharge, wherein the gate cutting is performed. A product discharging means provided with an inclined plate that supports only the product portion of the molded product that is gripped at one end in a horizontal state and tilts the end upward after gate cut so that only the product slides and falls. And a cutting means for performing a gate cut in a state where the molded product is horizontally supported by the product discharge means, and a gate cutting device for an injection molded product.