JPS59227429A - Automatic apparatus of injection molding work - Google Patents

Abstract

PURPOSE:To attain the full-automation of injection work over a multi-process of a product including insert parts, by providing a means for controlling a servo motor so as to coincide both contents of a memory means with respect of the objective position and the present position of a holding mechanism. CONSTITUTION:When a mold 13 is opened in a definite amount, a handle 21 is fallen between the movable side 40 and the fixed side 41 of the mold 13. The falling point thereof is preliminarily inputted to the memory 43 in a control part 39. In this case, the pulse number of a present position is detected by a pulse detecting part 50 to be compared with an objective position in an operation part and a product is taken out from the moving side 40 by the handle 21 at a point where the objective value is coincided with the present position. When the product is taken out, in order to insert parts to the fixed side 41, a signal is outputted to a servo motor 18 from a pulse signal correcting means 54 until the object value and a present value are coincided and the insert parts are inserted at the coincided point by the handle 21. Thereafter, similar correction is repeated to allow the product to advance to the next step.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an automatic device for injection molding operations, and more particularly to an automatic device suitable for injection molding operations involving complex operations involving insert parts.

[Background of the invention]

A typical forming process in an injection molding operation involving insert parts is shown in FIG.

As shown in the figure, this press process includes a step 101 of inserting an insert part into a predetermined mold set in an injection molding machine to reinforce parts of the product that are severely damaged or worn;
Step 1 of applying a mold release agent to aid mold release properties
02, a step 103 in which molten resin is injected into the mold by the A8 molding machine, a step 104 in which the product formed by this injection is left to cool for a certain period of time, and then the product is taken out from the mold. A step 105 of finishing the gate of the product, a step 106 of performing a predetermined inspection of this product, and thereafter,
It consists of a step 107 of arranging and straining the products as a finished product.

When automating these molding processes consistently, positioning is required for each process, and many positioning points are required within the series of operations, such as the supply of insert parts and the transfer position of the insert part receiver between the insert part and the insert part. becomes. Therefore, in order to fully automate injection molding operations, it is necessary to adopt a drive system that allows multi-point positioning.

Figure 2 shows a conventional drive system for a mechanism that takes out a product from a mold and inserts an insert part into a predetermined position in the mold.

The main body 1 is provided with a product takeout/insert part insertion hand (hereinafter simply referred to as hand) 21 for taking out a product from a mold or inserting an insert part into a mold. Further, the main body 1 is fixed to a piston 3 of an air cylinder 2 and guided by a guide bar 7 integrated with a frame 6.

Therefore, when air flows in through the air holes 4 and 5 of the air cylinder 2 and the piston 3 moves forward or backward, the main body 1 and the hand 21 also move forward in conjunction with this.

fall back. When the main body 1 is detected by the detection switches 8 and 9, air flow into the air handle 5 is prohibited and the piston 3
stops and the hand 21 is positioned. At that position, the hand 21 takes out the product from the mold 13 and inserts the insert into the mold.

In this way, the positioning of the hand 21 in the air cylinder method is performed by the detection switches 8 and 9. As the detection switch 8.9, a limit switch, a photoelectric switch, a proximity switch, or the like is used.

However, although two-point positioning is easy with these detection switches, multi-point positioning is very difficult. Therefore, if the mold 13 is of a different type for molding another product, and the positioning points are shifted, it is not possible to quickly take action. Furthermore, when automating the molding process as shown in FIG.
(Inser) fjVx Since the position to receive the product and the position to pass the product to the next process is required, it is difficult to fully automate injection molding work using the conventional air cylinder method, which has difficulty in multi-point positioning. That's funny.

[Purpose of the invention]

The purpose of the present invention is to solve the problems of the prior art as described above, and to provide an automatic device for injection molding operations that is versatile and fully automated in injection molding operations for products with insert parts. It's about doing.

[Summary of the invention]

In order to achieve the above object, the present invention provides an injection molding machine, an insert part supply section for supplying insert parts to the injection molding machine, a gate finishing section for finishing the gate of a product obtained from the injection molding machine, and a gate finishing section for finishing the gate of a product obtained from the injection molding machine. and a holding mechanism for holding the insert part, and moving the holding mechanism in order to transfer the product and the insert part held by the holding mechanism between the injection molding machine, the insert part supply section, and the gate finishing section. In an automatic device for injection molding work that is equipped with a drive mechanism and a control section that controls the entire system, a servo motor is adopted as a power source for the drive mechanism, and the control section has a target position and a current position of the holding mechanism. A first storage means and a second storage means each store the fgl, and a means for comparing the contents of the fgl storage means and the second storage means and controlling the servo motor so that the contents match. It is characterized by:

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 3 is an overall configuration diagram showing an embodiment of the present invention.

This device consists of (g) an injection molding machine set on a pedestal 10;
■Insers set on pedestal 27) Project product supply distribution section, gate finishing section set on 0 pedestal 32, (4
) An alignment stock part provided above the conveyor 38 via a support 37, and a (υ control part 39).The above five constituent parts will be explained in sequence below.

0) The injection molding machine has a mold 13 and a heating cylinder 44 as main components. One side of the mold 13 is fixed to a movable gouly plate 12, and the other is fixed to a fixed goy plate 11. The movable die plate 12 is connected to a drive device 12, and a rail 1 is mounted on the fixed die plate 11.
4 is provided. Limit switches 22 and 23 are provided at both ends of the rail 14, a cable cylinder 56, which is a type of air cylinder, is provided on the side surface, and a frame 15 is provided on the top surface. The frame 15 is then connected to a drive device 56 and configured to slide between limit switches 22, 23 on the rail 14 by means of a cable cylinder 5°. The frame 15 has a guide bar 1
6 and a lead screw 17 are provided, and the lead screw 1
A servo motor 18 is connected to 7. Further, a main body 19 is connected to the guide bar 16 and the dowel screw 17, an air cylinder 2o is fixed to the main body 19, and a hand 21 is attached to the tip of the air cylinder 2o.

(2) The insert parts supply and distribution section supplies the insert parts 5
Linear feeder 24a+2 that arranges 7 and feeds a certain amount of sudock.
An insert component placement stand 25 and a linear feeder 24 provided at a position corresponding to the insert component placement position of the 4BS product.
It is equipped with a distributor 20 that distributes the insert parts 57 on the insert parts 57a and 24b to the insert part mounts, and these are set on the mount 27. Here, the linear feeder 24
&.

24b is provided according to the type of insert part 57, so it is a straight axis! The feeder punches four times depending on the number of types of insert parts 57.

(2) The gate finishing section includes a product placing stand 28, a rail 29 on which the product placing stand 28 slides, a cutter 30 for finishing the gate of the product, a stand for fixing the cutter 30, and a pedestal 32 for installing these.

(The phrase alignment stock section includes alignment hand 33, alignment hand 3
3 in the Y-axis direction by the guide of a guide bar 34, a rail 30 for moving the Sakura-row hand 33 in the X-axis direction, a support 37 for supporting the rail 36, and a conveyor 38 for docking products. .

(■ The control unit 39 has a function of controlling the operation of the entire system.

Next, an outline of the operation of this device will be explained based on Fig. 3.

First, the distributor 26 picks up the insert parts 57 from the linear feeder 24 & or 24b, and transfers them to the insert placing table 25.
put it on. Next, the frame 15 is set at the position of the cable cylinder No. 56 and the second limit switch 23, and when the rotation of the servo motor 18 is transmitted to the lead screw 17, the main body 19 moves to the ground of the insert holder 25.

Then, the hand 21 is lowered by the action of the air cylinder 20, and the insert component 57 on the insert placement table 25 is picked up. Thereafter, the frame 15 is moved on the rail 14 to the position of the limit switch 22 by the cable cylinder 56.

On the other hand, the insert part 57 has already been inserted into the mold 13 at the previous shot stage. In this state, the heating tube 44
After the plasticized resin is injected into the mold 13 and cooled for a certain period of time, the movable die plate 12 is moved to the drive device 55.
, and the mold 13 is opened by a certain amount.

Here, the hand 21 has two holding parts, each of which functions independently. Therefore, when the mold 13 is opened a certain amount, the hand 21 descends while holding the inner part 57 in one holding part, and the other empty holding part is filled with the insert part 5 'I inserted. The product in this state is taken out from the mold 13 on the movable side, and the maintenance unit holding the insert part 57 inserts the insert part 57 into a predetermined position in the mold 13 on the movable side.

When the insert insertion force i ends, the hand 21 is raised by the air cylinder 20, and the hand 21 is moved on the rail 14 by the cable cylinder 56 to the limit switch 2.
3, and then move the main body 19 and hand 2
1 is moved by a servo motor 18 to the top of a product placement table 28. Then, the hand 21 is lowered by the air cylinder 20 and places the product on the product placement table 28.

The product placement table 28 is moved on the reseal 29 to the position of the cutter 30 by a 28th unia cylinder (not shown), and the cutter 30 cuts the gate of the product. The gate is formed by a sprue (gate) for injecting resin into the mold 13, and a gate is always present in a product molded with the mold 13. When the gate is cut, the product placement table 28 returns to its original position, and the product is picked up from the product placement table 28 by the alignment hand 33 and placed on the conveyor 38.

After placing the product 2 on the product placement stand 28, the hand 21 moves to the position of the insert placement stand 25 by rotating the lead screw 17, picks up the in-length upper part 57 again, and waits on the fixed guide plate 11. do. Thereafter, by repeating similar operations, the "C creation molding work" is automatically performed.

The layout set of this device, the in-1 tote supply distribution section, the gate finishing section, and the alignment stock section are arranged in the Y direction parallel to the injection molding machine, so the insert placement table 25 and the product placement table 28 are located on the same line. Therefore, positioning of the frame 15 in the X direction only needs to be done at two points. For this reason, an air cylinder system (cable cylinder 56) was adopted to drive the frame 15 in the The drive method also requires the use of a servo motor.

Next, the v1 moving thread of the main body 19 will be explained in more detail with reference to Fig. Φ and Fig. 5. 4v shows the hardware of the main body drive system, and FIG. 5 shows its operation flowchart.

FIG. 4 shows the mold on the movable side (hereinafter abbreviated as “b” movable side) 40
This is an example in which a product is taken out from the mold ζ) and an insert is inserted into a die 41 on the fixed side (hereinafter abbreviated as the fixed side). here,
The position to pick up the insert holder from the insert holder 25, the position to take out the product from the movable side 40, the position to insert the insert part into the fixed side 41, and the position to place the product on the product holder 28 are determined in advance by input means 42 in the memory of the control unit 39. 43 (Fig. 5 501, 502)
.

The movable die plate 12 moves forward, and the movable side 40 and the fixed side 4
1 is closed, plasticized resin is injected into the mold 13 by the heating cylinder 44. The mold 13 is cooled for a certain period of time while being closed, and then an oil hole 4 is formed in the cylinder chamber 45.
6, the movable die plate 12 integrated with the booster 47 is moved back, and the mold 13 is opened.

When the mold 13 is opened to a certain degree, air flows into the descending cylinder chamber 49 from the air hole 48 of the air cylinder 20, and the hand 21 descends between the movable side 40 and fixed side 41 of the mold 13. The lower 1,000 points are also input into the memory 4-3 in the control section 39 in advance.

Then, the number of pulses at the current position is detected by the pulse cutter 50, and is stored in the counter 51 (505).

The target value (product removal position) is stored in the counter 5 from the memory 4-3.
2, the current position in the counter 51 and the target value in the counter 52 are read into the arithmetic unit 53 and compared and determined in magnitude (503, 504, 506, 507).

If the target value is larger than the current value, the pulse signal correction means 54 outputs a Nihals increase signal to the servo motor 18, causing the servo motor 18 to rotate forward, and the rotation is transmitted to the lead screw 17, thereby causing the main body 19 approaches the movable side 40 (50''/, 508, 509).

Then, the number of pulses at the current position is written into the counter 51 by the pulse detection unit 50, compared with the target value in the calculation unit 53, and the pulse signal correction unit 54 repeats the correction until the target value and the current value match. It will be done. When the target value and the current value match, the product is taken out from the movable side 40 by the hand 21.

When the product is taken out, a target value (insert part type position) for inserting 15 inserts for the next shot into the fixed side 41 is written into the counter 52 from the memory 43 (503). Then, as in the case of removing a second item, the target value and the current value are compared and determined (507). Na”
Te5: At this point, the current value is larger than the g target value. Pulse signal correction means 5 until the target value and current value match.
4 repeatedly outputs a negative signal to the servo motor 18, and the negative rotation of the servo motor 18 is transmitted to the lead screw 17, so that the main body 19 approaches the fixed side 41 (
510, 511). The insert is inserted by the hand 21 at the point where the target value and the current value match.

After that, the main body 19 moves forward by repeating the same correction,
Return to the first descent point. When the hand 21 returns to the descending point, air is introduced into the ascending cylinder chamber 55 of the air cylinder 20 from the air hole 56, causing the hand 21 to ascend and proceed to the next step.

Next, an example of the operation pattern of the positioning operation will be explained with reference to Fig. 6. , and after placing the product on the product placement table 2, the insert part is picked up from the insert placement table 25 and returned to the starting position.
There is a positioning point in the illustration.

FIG. 7 shows an example in which a product is taken out from the movable side +O, an insert part is inserted into the movable side 40, and the product is placed on the product placement stand 28, and then the insert part is picked up from the insert placement stand 25 and returned to the timing position. This also has five positioning points.

Figure 8 shows the product being taken out from the movable side 40 and placed on the product placement stand 2.
In this example, the product is placed at position 8 and returned to its original position, and there are three positioning points.

Automation of multi-point positioning can be achieved by storing such an operation pattern and both numbers of positioning points (target values) in the memory 43 and sending a signal to the pulse motor 18 so that the target value and the current value match. This makes it possible to fully automate injection molding operations, which are common in multiple processes for products involving insert parts.

In addition, it can easily respond to changes in the shape and size of the product and the amount of mold opening, and as a versatile piece of equipment, the installation and investment efficiency is high.

〔Effect of the invention〕

As explained above, according to the present invention, it has versatility in injection molding work of products having insert parts,
And full automation can be achieved at L4 level.

[Brief explanation of the drawing]

Fig. 31 is a diagram showing the process of injection molding work, Fig. 2 is a diagram showing a conventional drive system, Fig. 3 is an overall configuration diagram of an embodiment of the present invention, and Fig. 4 is an embodiment of the present invention. FIG. 5 is an operation flowchart of FIGS. 2 to 4, and FIGS. 6, 7, and 8 are diagrams showing examples of operation patterns. 15: 7 frame, 16: Guide bar, 17: Lead screw, 18: Servo motor, 19: Main body, 20: Air cylinder, 211J product extraction/insert hand, 2
5: Insert 1a unit, 26: Distributor, 28: Product iQ
stand, 39: control unit, 40: movable (41 mold, 41: fixed side mold, 43 = memory, 50: pulse detection part 1, 5
1, 52: Kawanta, 53 = Arithmetic unit, 54: Pulse signal correction means, 56 = Seagle cylinder, 57: Insert Wr product. Figure 1 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] (G) An injection molding machine, an insert parts supply section for supplying insert parts to the injection molding machine, a gate finishing part for finishing the gate of the product obtained from the injection molding machine, and a part for holding the product and the insert parts. retention mechanism,
A drive mechanism for moving the holding mechanism to transfer the product held by the holding mechanism between the injection molding machine, the insert part supply section, and the gate finishing section, and a control section for controlling the entire system. In an automatic device for injection molding work, a servo motor is employed as a power source for the drive mechanism, and the control section includes a first storage means and a second storage means for storing a target position and a current position of the holding mechanism, respectively. An automatic injection molding operation characterized by comprising a storage means and a means for comparing the contents of the first storage means and the second storage means and controlling the servo motor so that the contents match. Device.