JPH04107022U - Injection molding machine control device - Google Patents

Abstract

(57) [Summary] (with modifications) [Purpose] By changing the screw rotation speed in multiple stages and variably controlling the filling speed of resin into the mold cavity, it is possible to improve the quality of molded products and solve complex problems. Enables molding of shaped products. [Structure] In an in-line screw injection molding machine, the molding material that has been plasticized by the rotation of the screw is transferred to the cylinder 4.
In a control device for a molding method in which a cavity 13 is continuously filled without accumulation, a flow rate regulating valve is installed on a passage that supplies pressure oil to a hydraulic chamber of a hydraulic cylinder 6 of a drive device 2 that rotationally drives a screw 1. The flow rate regulating valve 9 is controlled by a signal from a control mechanism 18, and the control mechanism 18 is equipped with a plurality of screw rotation speed setting devices and a screw rotation time setting device to adjust the screw rotation speed. It is characterized in that the filling speed of the resin that matches the shape of the cavity 13 of the mold 12 is made variable by changing it in multiple stages.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention is an in-line screw type injection molding machine that can be used by rotating the screw. Continuously fills the cavity with plasticized molding material without accumulating it inside the cylinder. The so-called intrusion molding method (flow molding) The present invention relates to a control device.

0002

[Conventional technology]

In an injection molding machine, there is one method for filling the mold cavity with resin and molding. Generally, the resin stored at the tip of the cylinder is screwed without rotating the screw. It is performed only by the forward movement of the so-called injection movement, but the injection per shot If the capacity exceeds the capacity of the injection molding machine, the pre-process is a screw rotation operation, and the post-process is a screw rotation operation. The process involves filling the mold cavity with resin in two steps: the forward movement of the screw described above. This is a method of molding that exceeds the injection capacity of the injection molding machine by There is a fusion molding method (flow molding).

0003

[Problem that the idea aims to solve]

However, the screw rotation speed N in the intrusion molding and the rotation at that time As shown in FIG. 4, the time T is determined by a pair of screen It can only be controlled at the speed and time preset with the rotary speed setting device and its time setting device. Therefore, the amount of resin filled into the mold cavity per hour is constant, and the actual It is not possible to fill the resin with optimal conditions that suit the cavity shape of the existing mold. It has been difficult to obtain a molded product of good quality depending on the shape of the molded product.

0004 In other words, when filling the mold cavity with resin in an injection molding machine, the injection The screw advance speed, that is, the injection speed, is multi-stage speed controlled for the ejecting operation, and the mold cavity is This method fills the resin under optimal conditions that suit the shape of the tee. In the case of John molding, the process of filling the mold cavity with resin by rotating the screw is Since the multi-stage control described above is not performed, the quality of molded products can be improved and molded products with complex shapes can be improved. It was difficult to mold.

[0005] The present invention uses the above-mentioned molding method to change the screw rotation speed in multiple stages. Provides a control device that variably controls the filling speed of resin into a cavity, and solves the above problems. This is an attempt to solve the problem.

[0006]

[Means to solve the problem]

For this reason, the present invention is designed to prevent screw rotation in in-line screw injection molding machines. More plasticized molding material is continuously poured into the cavity without accumulating in the cylinder. In the control device for the molding method that fills the A flow rate adjustment valve is installed on the path that supplies pressure oil to the equipment, and the flow rate adjustment valve is connected to the control mechanism. The control mechanism is controlled by multiple screw rotation speed setting devices and screw By being equipped with a screw rotation time setting device, the screw rotation speed can be changed in multiple stages. The filling speed of resin that matches the shape of the mold cavity can be made variable. This is a means to solve problems.

[0007]

[Effect]

In intrusion molding, resin is inserted into the mold cavity through the rotation of the screw. The resin filling speed in the filling process is related to the screw rotation speed. required Increasing the screw rotation speed will increase the filling speed; If it is made smaller, the filling speed will be slower. Therefore, the mold cavity is opened by rotating the screw. In the process of filling the resin with resin, multiple screw rotation speed setting devices and screw The screw rotation speed and screw rotation time are controlled in multiple stages using a rotation time setting device. This allows the mold cavity to be filled with optimum conditions that suit the shape of the mold cavity. Can be filled with fat.

[0008]

【Example】

The present invention will be explained below with reference to drawings. Figure 1 shows an embodiment of the present invention. , 1 is a screw, 2 is a screw rotation drive device, 3 is a hopper, and 4 is a cylinder. The screw 1 is connected to a piston 10 of a hydraulic cylinder 6. By supplying pressure oil from a hydraulic device (not shown) to the hydraulic chamber 6a of 6, the screw 1 The resin stored in the front part 5 of the screw 1 is transferred to the cavity of the mold 12 This is to fill the inside of the tee 13.

[0009] The screw 1 is rotated by a screw rotation drive device (generally a hydraulic motor) 2. The pump 8 supplies pressurized oil to the screw rotation drive device 2. By doing so, the screw rotates and the resin stored in the hopper 3 is transferred to the cylinder. The resin is passed through the front end 5 of the mold 4 and the resin path 11 to fill the cavity 13 of the mold 12. . The pressure oil supplied to the screw rotation drive device 2 by the pump 8 is controlled by the flow rate adjustment valve 9. controlled. 7 is a reservoir, 18 is a control mechanism, and the control mechanism 18 is a flow rate adjustment valve 9. A device that gives electrical commands to and controls the flow rate of pressure oil supplied to the screw rotation drive device 2. It is.

0010 Next, details of the control mechanism 18 will be explained with reference to FIG. screw rotation speed setting devices 20, 20A, 20B and multiple screw rotation times Setters 21, 21A, 21B calculate their set values and send a signal to the flow rate adjustment valve 9. It is composed of an arithmetic unit 19 that sequentially outputs electrical outputs via a line 22. In the embodiment shown in FIG. 3, a screw rotation speed setting device and a screw rotation time setting device are used. Of course, these are not limited to only three, but can be multiple. As long as there are several pieces, the number may be 3 or less or 3 or more.

Next, to explain the operation of the embodiment of FIGS. 1 and 3 configured as above, first, the screw rotation speed setting device 20 installed in the control mechanism 18 sets the screw rotation speed of the first stage. Set _N1 . The screw rotation time _T1 at that time is set by the screw rotation time setting device 21. Next, the second stage rotation speed N ₂ is set by the screw rotation speed setter 20A, and the screw rotation time T ₂ at that time is set by the setter 21A. Similarly, the rotation speed N ₃ of the third stage is set by the screw rotation speed setting device 20B, and the rotation time T ₃ is set by the screw rotation time setting device 21B. Here, the numerical values set by the setting devices 20 to 20B and 21 to 21B are calculated by the calculation device 19, and the electrical output thereof is applied to a flow rate regulating valve that controls the flow rate of the pressure oil supplied to the screw rotation drive device 2. 9 via the signal line 22.

0012 The flow rate adjustment valve 9 has its opening degree adjusted by an electrical output signal output from the calculation device 19. is performed to control the flow rate and time of pressure oil to the screw drive device 2. The result As a result, the intrusion fills the cavity 13 of the mold 12 with resin by rotating the screw. In the pre-process during molding, the screw rotation speed and screw rotation time are adjusted in multiple stages. The injection operation is controlled by changing the injection operation, and the screw 1 is not rotated in the post-process. It becomes possible to control injection operation only in the forward direction.

[0013]

[Effect of the idea]

Since the present invention is constructed as explained in detail above, it has the following effects. . Generally, when molding a molded product with an injection molding machine, the In order to mold under optimal conditions, the screw advancement speed is controlled in multiple stages to achieve high quality molding. In the same way, this invention also obtains gold by rotating a screw. The screw rotation speed is controlled in multiple stages during the process of filling the mold cavity with resin. This has the effect that a molded product of good quality can be obtained in the same manner as described above.

[Brief explanation of drawings]

FIG. 1 is a system diagram showing a cross section of an injection section and a mold section of a control device showing an embodiment of the present invention.

FIG. 2 is a chart of screw rotation speed and resin filling speed in the present invention.

FIG. 3 is a detailed diagram of the control mechanism in FIG. 1;

FIG. 4 is a chart showing the conventional screw rotation speed and resin filling speed.

[Explanation of symbols]

1 screw 2 Screw rotation drive device 4 cylinder 5 Front end 6 Hydraulic cylinder 8 pump 9 Flow rate adjustment valve 10 Piston 11 Resin road 12 Mold 13 Cavity 18 Control mechanism 20, 20A, 20B Screw rotation speed setting device 21, 21A, 21B Screw rotation time setting device

Claims (1)

[Scope of utility model registration request] Claim 1: A control device for a molding method in which a molding material plasticized by screw rotation in an in-line screw injection molding machine is continuously filled into a cavity without being accumulated in a cylinder, the screw being rotationally driven. A flow rate adjustment valve is provided on the passage that supplies pressure oil to the drive device, and the flow rate adjustment valve is controlled by a signal from a control mechanism, and the control mechanism includes a plurality of screw rotation speed setting devices and screw rotation time setting devices. 1. A control device for an injection molding machine, characterized in that the screw rotation speed is changed in multiple stages to vary the filling speed of resin that matches the shape of a mold cavity.