JPH05104229A - Method for controlling takeout of product in die forming machine - Google Patents

Abstract

PURPOSE:To eliminate the unconformability of movements between a product ejecting device and a product takeout device and various kinds of the inconveniences caused by the uncomformability of movements by controlling the product takeout device so as to follow to the product ejecting device to secure the synchronization to each other. CONSTITUTION:This machine provides the product ejecting device 20 for ejecting the product formed in the die, an ejecting control means 40 for controlling this product ejecting device, the product takeout device 30 for taking out the ejected product to out of the die and a takeout control means 60 for controlling this product takeout device. Further, this machine provides an ejecting stroke detecting means 70 for detecting the ejecting stroke in the product ejecting device and a takeout stroke detecting means 62 for detecting the takeout stroke in the product takeout device. A synchronous control means 80 for controlling the product takeout device is provided so as to eliminate the stroke difference between the ejecting stroke and the takeout stroke by detecting the stroke difference at the time of working the product ejecting device 20. By this method, the unconformability of the movements between the product ejecting device and the product takeout device and the other inconveniences can be eliminated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a product take-out control device for a molding machine, which can be used as a take-out part of a molded product when die-casting metal or injection molding synthetic resin.

[0002]

2. Description of the Related Art Conventionally, in die casting of metal, injection molding of synthetic resin, etc., a product extruding device for extruding a product molded in a mold and a product ejecting device for ejecting the extruded product out of the mold have been used. ing.

FIG. 4 shows a conventional Dacast machine 10. Die casting machine 10 is a moving die plate 11
And fixed die plate 12, each of which has a moving die 13
And the fixed mold 14 is attached. Moving die plate 11
Are moved closer to and separated from the fixed die plate 12 by a mold clamping mechanism (not shown), and thereby the movable mold 13 and the fixed mold 14 are clamped or opened. Then, it is possible to mold the product 15 by injecting and filling the internal cavities of the movable mold 13 and the fixed mold 14 with the molten metal in the mold clamped state.

The molded product 15 is taken out from the moving mold 13
And the fixed mold 14 is opened. At this time, the product 15 is designed to remain on the moving mold 13 side, and in order to remove the product 15 remaining on the moving mold 13,
A product extrusion device 20 is installed on the movable die plate 11. Further, in order to take out the product 15 removed by the product pushing device 20, the product taking-out device 30 is installed near the installation site of the fixed die plate 12.

The product extruding device 20 has a rod-shaped extruding member 21 which penetrates the movable die plate 11 so as to be movable back and forth in the axial direction.
The base end of the pushing member 21 is connected to the pushing plate 22 along the back side of the moving die plate 11. An extruding rod 24 is connected to the tip of the extruding member 21 via an extruding plate 23, and the extruding rod 24 penetrates the movable mold 13 so as to be able to move forward and backward, and its tip can project to the product 15 side of the movable mold 13. Is. Extrusion plate 22
Is an extrusion guide rod 25 fixed to the moving die plate 11.
It is guided and supported by and is connected to the moving die plate 11 via the extrusion cylinder 26.

A hydraulic pressure supply source 28 is connected to the extrusion cylinder 26 via a solenoid valve 27.
The contraction and extension of the extrusion cylinder 26 can be controlled by switching 27. Then, the extruding cylinder 26 is contracted to move the extruding plate 22 along the extruding guide rod 25, and the tip of the extruding rod 24 is projected from the moving mold 13 to push out the product 15 remaining in the moving mold 13. Is configured. A flow rate adjusting valve 29 is installed between the switching valve 27 and the hydraulic pressure supply source 28. By limiting the flow rate of the hydraulic oil with the flow rate adjusting valve 29, the moving speed of the extrusion cylinder 26 or the extrusion rod 24 can be adjusted. It is like this.

In order to control the operation of the product extruding apparatus 20 as described above, an extruding control means 40 is connected to the product extruding apparatus 20. The extrusion control means 40 is also used as a control panel of the die casting machine 10, and operates the product extrusion device 20 at a predetermined timing based on a series of sequences such as mold clamping, mold opening, and molten metal injection.

The product take-out device 30 is a chuck part for holding the biscuit part 16 of the product 15 removed by the product push-out device 20.
The chuck portion 31 has an arm 32, an upper saddle 33,
It is supported via the lower saddle 34 and the beam 35.

The arm 32 can be expanded and contracted in the vertical direction by an unillustrated hydraulic / pneumatic cylinder, and its lower limit is set at a position where the chuck part 31 concentrically faces the biscuit part 16 of the product 15 and its upper limit is set. It is set at a position outside the molds 13 and 14. The arm 32 is supported by the upper saddle 33 via a rail 51 and a slide bearing 52, and is movable from a state in which the chuck portion 31 is inside the molds 13 and 14 to a state in which the chuck portion 31 is laterally exposed.

The upper saddle 33 is slidably supported by the lower saddle 34 in the mold clamping direction, and is movable in the same direction by a take-out cylinder 53. The lower saddle 34 is guided and supported by a rail 54 attached along the beam 35. Rack 55 for beam 35
And a motor 56 is installed in the lower saddle 34, a pinion (not shown) attached to the motor 56 is meshed with the rack 55, and the rotation of the motor 56 allows the lower saddle 34 to travel with respect to the beam 35.

A hydraulic pressure source 59 is connected to the take-out cylinder 53 via an electromagnetic direction switching valve 57 and a proportional flow rate control valve 58. The direction switching valve 57 can switch between a state in which the hydraulic oil from the hydraulic power source 59 is supplied to the forward side of the extraction cylinder 53, a state in which the hydraulic oil is supplied to the backward side, and a state in which the hydraulic oil is not supplied. The proportional flow rate control valve 58 adjusts the flow rate of hydraulic oil from the hydraulic pressure source 59 by an external signal. The take-out cylinder 53 can be driven in a predetermined state according to the settings of the direction switching valve 57 and the proportional flow rate control valve 58.

The product take-out device 30 as described above operates as follows. Normally, the chuck portion 31 is in a retracted state (on the side opposite to the product 15) and stands by outside the molds 13 and 14. Following the mold opening after molding, the arm 32 descends and enters the inside of the molds 13, 14, and the upper saddle 33 is moved by the take-out cylinder 53.
Moves forward, and the chuck portion 31 chucks the product 15 extruded by the product extruding device 20. Then, the upper saddle 33 is retracted by the take-out cylinder 53 to separate the product 15 from the moving mold 13, and the arm 32 is lifted to come out of the molds 13 and 14, so that the product 15 is taken out.

In order to control the operation of such a product take-out device 30, a take-out control means 60 is installed. The take-out control means 60 is composed of a sequencer or the like in which an operation program is set in advance, and its output is connected to the proportional flow rate control valve 58 via an amplifier 61. Further, a signal during the extrusion operation from the extrusion control means 40 is input to the input of the extraction control means 60, and the upper saddle driven by the extraction cylinder 53 is also input.
The output of the take-out stroke detecting means 62 for detecting the movement of 33 is connected.

The take-out stroke detecting means 62 includes a lower saddle 34
It has a rotary encoder 63 supported on its side, and a pinion 64 attached to its detection shaft is meshed with a rack 65 fixed along the upper saddle 33. Rotary encoder
A pulse train corresponding to the rotation angle is output from 63, the rotation amount is detected by counting this pulse, and the extraction stroke can be detected from this rotation angle.

The take-out control means 60 is activated when the product pushing-out device 20 pushes out the product 15 by the control signal from the pushing-out control means 40, operates the product taking-out device 30, and causes the chuck portion 31 to pick up the product 15. Move the product 15 while gripping and monitoring the movement by the ejection stroke detection means 62
Separate it from 13 and take it out of the dies 13 and 14. On this occasion,
The take-out control means 60 adjusts the proportional flow rate control valve 58 while monitoring the movement amount of the take-out cylinder 53 or the upper saddle 33 detected by the take-out stroke detection means 62, and moves the product 15 and the movement based on a preset operation program. The chuck portion 31 is positioned with respect to the mold 13 or the moving speed is adjusted.

[0016]

By the way, in the conventional die casting machine 10 as described above, the product extrusion device
If you want to extrude product 15 with 20, this product 15 will move mold
It is necessary to chuck with the product take-out device 30 before that so as not to fall off from 13. Therefore, the product extrusion device 20
The push-out operation of the product 15 by the push-out cylinder 26 and the take-out operation of the product 15 by the take-out cylinder 53 of the product take-out device 30 are overlapped in the same direction.

However, the product extrusion device 20 is an extrusion cylinder.
The extrusion speed of the product 15 is likely to fluctuate because the extrusion speed of the product 15 is simple because the extrusion speed is adjusted by adjusting the flow rate of the hydraulic oil to the pressure adjustment valve 29. On the other hand, the product take-out device 30 is controlled by the proportional flow rate control valve 58 to a take-out speed according to a preset operation program.

Therefore, the product extrusion device 20 and the product take-out device
There is a difference in the moving speed of 30, and the operation mismatch of the devices 20 and 30 occurs. As a result, the product 15 that the product extrusion device 20 extrudes.
A situation occurs in which the product take-out device 30 is pushed through the device, and a heavy load is applied to each device 20, 30. Then, due to such a load, a portion such as the arm 32 of the product take-out device 30 having a weak structural strength is bent and deformed, which causes a problem of damage.

An object of the present invention is to provide a product take-out control device for a molding machine which can eliminate the operational mismatch between the product push-out device 20 and the product take-out device 30.

[0020]

DISCLOSURE OF THE INVENTION The present invention relates to a product extruding device for extruding a product molded in a mold, an extrusion controlling means for controlling the product extruding device, and a product for taking out the extruded product out of the mold. A product take-out control device for a molding machine comprising a take-out device and a take-out control means for controlling the product take-out device, wherein an extruding stroke detecting means for detecting an extruding stroke of the product extruding device, and the product taking-out device. And a synchronous control for detecting the stroke difference between the pushing stroke and the take-out stroke when the product pushing apparatus operates and controlling the product taking-out apparatus so as to eliminate the stroke difference. And means are provided.

At this time, the synchronous control means conducts the switching circuit for conducting the signal from the extrusion stroke detecting means and the signal from the taking out stroke detecting means when the product extruding device operates, and the switching circuit is conducted. An arithmetic circuit that detects and outputs the stroke difference between the pushing stroke and the take-out stroke, and the output of the arithmetic circuit to the product take-out device instead of the output of the take-out control means when the product pushing-out device operates. It is desirable to be configured to include a switching circuit to be connected.

The product take-out device includes a cylinder for driving the product take-out portion and a flow rate control valve for adjusting hydraulic oil to the cylinder, and the synchronous control means and the take-out control means have the flow rate control valve. It should be controlled. Further, the product unloading device may include a motor that drives a product unloading portion and a feed mechanism, and the synchronization control unit and the unloading control unit may control the motor.

[0023]

[Operation] In the present invention as described above, the product take-out device is normally controlled by the take-out control means similar to the conventional one.
During the operation of the product extrusion device, the product extraction device is controlled by the synchronization control means so as to operate synchronously in accordance with the operation of the product extrusion device. That is, the synchronization control means detects a stroke difference between the ejection stroke detected by the ejection stroke detection means and the ejection stroke detected by the ejection stroke detection means, and controls the product ejection device so as to eliminate the stroke difference. For this reason, the product take-out device moves at the same speed as the product push-out device while maintaining a constant relative distance between them, which may cause operational mismatch or mechanical interference between the product push-out device and the product take-out device. It is solved, and the above-mentioned object is achieved by these.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, the basic configuration of this embodiment is shown in FIG.
The die-casting machine 10 is similar to the die-casting machine 10 of the present invention, but in order to control the product unloading device 30 according to the present invention, the product extrusion device 20 is provided with the extrusion stroke detecting means 70, and the unloading control means 60 is connected with the synchronous control means 80. Has been done. In the following description, for simplification, the same parts as those in FIG. 4 are denoted by the same reference numerals and the description thereof will be omitted, and the different parts, that is, the extrusion stroke detection means 70 and the synchronization control means 80 will be described.

The extrusion stroke detecting means 70 has a rotary encoder 71 supported by the moving die plate 11, and a pinion 72 attached to its detection shaft is meshed with a rack 73 fixed to the extrusion cylinder 26. A pulse train corresponding to the rotation angle is output from the rotary encoder 71, and the rotation amount is detected by counting this pulse.
The relative movement amount of the extrusion cylinder 26 and the moving die plate 11 can be detected from this rotation angle.

The synchronous control device 80 includes an opening / closing circuit 81 and a comparator.
Operation circuit 82A consisting of 82 and D / A converter 83
And a switching circuit 84. The output of the take-out stroke detecting means 62 and the push-out stroke detecting means 70 is connected to the opening / closing circuit 81, and a signal during the push-out operation of the push-out controlling means 40 is input. The signal from each stroke detecting means 62, 70 is passed to the comparator 82 only while the pushing operation is being performed.

The comparator 82 compares and subtracts the signals from the stroke detecting means 62, 70 sent from the switching circuit 81, and outputs the difference between the respective moving strokes to the D / A converter 83.
The D / A converter 83 converts the stroke difference sent from the comparator 82 from a pulse train digital signal into an analog voltage signal, and sends the analog voltage signal to the switching circuit 84.

The output of the take-out control means 60 and the push-out control means 40 is input to the switching circuit 84 together with the output of the D / A converter 83. Normally, the command signal from the take-out control means 60 is selected and the amplifier 61 is turned on. Output to the proportional flow rate control valve 58 via the amplifier 61.While the extrusion control means 40 causes the product extrusion device 20 to perform an extrusion operation, the output of the D / A converter 83 is selected and the proportional flow rate control is performed via the amplifier 61. Output to valve 58.

In this embodiment, the extrusion control means 40 operates the product extrusion device 20 to extrude the product 15, and at the same time, the ejection control means 60 and the synchronization control means 80.
The product take-out device 30 is operated to take out the product 15.

That is, the extrusion control means 40 is the product extrusion device.
When 20 is operated, the switching circuit 84 is switched by the signal from the extrusion control means 40, and the control of the product take-out device 30 is transferred from the take-out control means 60 to the synchronous control means 80. Further, the opening / closing circuit 81 is brought into a conductive state by a signal from the extrusion control means 40, and the movement amount of the product extrusion device 20 detected by the extrusion stroke detection means 62 and the movement of the product extraction device 30 detected by the extraction stroke detection means 70. The respective quantities are input to the comparator 82, the control voltage corresponding to the stroke difference is input from the D / A converter 83 to the proportional flow control valve 58 via the switching circuit 84, etc., and the take-out cylinder 53 of the product take-out device 30 is synchronized. Will do the action.

That is, for example, when the take-out cylinder 53 is stopped, the detection signal from the take-out stroke detection means 70 is zero, but the detection signal from the push-out stroke detection means 62 increases with the operation of the push-out cylinder 26. Then, the stroke difference from the comparator 82 increases in the same manner, and the take-out cylinder 53 that operates by the control voltage corresponding to this stroke difference operates in synchronization with the extrusion cylinder 26.

According to the present embodiment as described above, the take-out operation control of the product take-out device 30 is normally performed by the take-out control means 60, but the take-out operation control of the product take-out device 30 is synchronized only when the product push-out device 20 is operating. Since it is performed by the control means 80, it is possible to reliably synchronize the respective moving states of the product pushing device 20 and the product taking-out device 30 during the overlapping operation.

In particular, in the synchronous control, the control of the product take-out device 30 is switched to the synchronous control means 80, and the product extruding device is
Since the control is performed so as to follow the actual operation state of the product 20, each synchronization state can be made accurate according to the actual operation of the product extrusion device 20. Furthermore, since automatic follow-up synchronization is executed, adjustment work for obtaining accurate synchronization can be greatly simplified.

Therefore, the product extruding device 20 and the product extracting device 30
It is possible to prevent a difference in the moving speed of each device 20, 30 during the overlapping operation with, and the operation mismatch due to the fluctuation of each stroke difference as in the past, and the bending due to the increase in load on each device 20, 30 Inconveniences such as deformation and damage can be prevented in advance.

Further, since the control is switched to the control by the synchronous control means 80 only during the synchronous control, the basic control of the product take-out device 30 other than during the synchronous control can be performed by the normal take-out control means 60, and the existing device can be controlled. It can be easily implemented by application.

The present invention is not limited to the above embodiment, and the following modifications are included in the present invention. For example, the D / A converter 8 of the synchronization control means 80
The reference level of the control voltage from 3 may be set appropriately,
As shown in FIG. 2, when the control voltage is plotted on the ordinate and the stroke difference between the product pushing device 20 and the product unloading device 30 is plotted on the abscissa, the control voltage is set to zero when the stroke difference is zero. It becomes a graph like. On the other hand, when a bias is applied so that the control voltage becomes the predetermined value B when the stroke difference is zero, a graph such as 83B in the figure is obtained. The bias voltage is adjustable, and the bias current of the proportional flow rate adjusting valve 58 can be adjusted.

Further, in the above-mentioned embodiment, the product taking-out device 30 of the type that linearly moves in a plurality of axial directions has been described, but the product taking-out device 30 may be of a type using a multi-joint type robot arm 32A. In this case, as shown in FIG. 3, the rack 65 may be attached to the upper saddle 33 and the rotary encoder 63 in which the pinion 64 is engaged may be provided to detect the take-out stroke.

Further, in the above-described embodiment, the take-out stroke detecting means 62 and the push-out stroke detecting means 70 are explained as a system using the rack and pinion and the rotary encoder, but the moving parts of the product pushing-out device 20 and the product taking-out device 30 in the pushing direction are respectively. Stroke detection may be performed by forming a magnetic and non-magnetic striped pattern on the rod or the like and detecting a pulse associated with the movement of the rod by a magnetic sensor or the like that is installed opposite to the fixed side. The method of detecting each stroke is not limited to a digital method, but may be an analog method or the like. In short, it suffices that the push stroke and the take out stroke of each of the devices 20 and 30 can be reliably detected.

Further, the configuration of the synchronization control means 80 may be set appropriately, the configuration for calculating the stroke difference from the signals from the stroke detection means 62, 70, and the specific configuration of the switching circuit 74 are arbitrary, and each stroke is Detection means 62, 70
When is an analog type, all the synchronization control means 80 may be an analog type, and the D / A converter 73 is unnecessary.

On the other hand, if the flow control valve 58 is a valve whose opening is adjusted by a digital signal, the D / A converter 73 may be used if the stroke detection means 62, 70 or the synchronous control means 80 are all digital. Is unnecessary. The flow rate control valve 58 may be a servo valve or the like.

Furthermore, in the above embodiment, the product pushing device 20 and the product taking-out device 30 were hydraulically driven, but the respective operating parts may be air driven or motor driven. In the case of driving the motor, the synchronous control means 80 may be connected to the motor driver instead of the flow rate control valve 58 in the above embodiment, and the motor control voltage for driving may be controlled. In this case, since the forward / reverse direction switching can be performed by the drive voltage to the motor, the direction switching valve 57 or the like is unnecessary.

Each part of the die casting machine 10 in the above embodiment may have another structure, and the driving method, the valves necessary for driving, the switching means, etc. may be appropriately selected for implementation. The present invention is applicable not only to horizontal die casting machines but also to vertical type machines having different types.

[0043]

As described above, according to the present invention, by controlling the product take-out device 30 so as to follow the product extruding device 20, it is possible to ensure the synchronization of each product, and the conventional product It is possible to eliminate the operational inconsistency between the extrusion device 20 and the product take-out device 30 and various inconveniences caused by this.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention.

FIG. 2 is a graph showing a modified example of the present invention.

FIG. 3 is a partial structural diagram showing a modified example of the present invention.

FIG. 4 is a configuration diagram showing a conventional example.

[Explanation of symbols]

 10 Die casting machine which is a molding machine 13 Moving mold 14 Fixed mold 15 Product 20 Product extrusion device 30 Product ejection device 40 Extrusion control means 53 Ejection cylinder 58 Flow rate adjusting valve 60 Ejection control means 62 Ejection stroke detection means 70 Extrusion stroke detection Means 80 Synchronous control means 81 Switching circuit 82 Comparator 83 D / A converter 84 Switching circuit

Claims (4)

[Claims] 1. A product extruding device for extruding a product molded in a mold, extrusion control means for controlling the product extruding device, a product ejecting device for ejecting the extruded product out of the mold, and this product ejecting device. Is a product take-out control device of a molding machine having a take-out control means for controlling the ejection stroke of the product extruding device, and an ejection stroke for detecting the take-out stroke of the product taking-out device. A detection means and a synchronous control means for detecting a stroke difference between the pushing stroke and the take-out stroke when the product pushing apparatus operates and controlling the product taking-out apparatus so as to eliminate the stroke difference. The product take-out control device of the characteristic molding machine. 2. The product take-out control device for a molding machine according to claim 1, wherein the synchronous control means outputs a signal from the extruding stroke detecting means and a take-out stroke detecting means when the product extruding device operates. An opening / closing circuit that conducts a signal, an arithmetic circuit that detects and outputs a stroke difference between the extrusion stroke and the ejection stroke when the opening / closing circuit is conducted, and an arithmetic circuit of the arithmetic circuit when the product extrusion device operates. A product take-out control device for a molding machine, comprising a switching circuit for connecting an output to the product take-out device instead of the output of the take-out control means. 3. The product take-out control device for a molding machine according to claim 1 or 2, wherein the product take-out device has a cylinder for driving a product take-out portion, and a flow rate for adjusting hydraulic oil to the cylinder. A control valve, wherein the synchronous control means and the take-out control means control the flow rate control valve. 4. The product take-out control device for a molding machine according to claim 1 or 2, wherein the product take-out device includes a motor for driving a product take-out portion and a feed mechanism, and the synchronous control means and A take-out control means controls the motor, and a product take-out control device for a molding machine.