JPH0312474Y2 - - Google Patents

Description

[Detailed description of the invention] This invention has a screw that contacts a side disk driven by an appropriate drive mechanism such as a motor, rotates together with a flywheel driven by friction, and raises and lowers a slide member. The present invention relates to a friction screw press that performs pressing using a slide member and a mold provided on a bed facing the slide member, and particularly to a control device thereof.

As mentioned above, in the friction screw press, the flywheel in contact with the side disks is driven by the side disks and moves down with the screws to perform press forming.
The process is not constant.

Therefore, by adjusting the work energy,
Since it is possible to perform processing appropriate to the shape of the product, it is necessary to set the amount of energy depending on the amount of molding of the product.

Furthermore, depending on the amount of product molded, the product may accumulate in the mold, and a product knockout device is required to take it out.

Conventionally, a limit switch was installed to detect when the slide member was in the process of descending, and the energy was set at the descending position of the slide member, resulting in large variations in the set energy, and the position of the limit switch had to be adjusted for each blow. Furthermore, the knock-out device was operated using a push button switch or foot switch as necessary, resulting in poor work efficiency and safety issues.

In order to solve the problems of the conventional friction screw press mentioned above, this invention converts the rotational speed (r, p, m) of the flywheel into a pulse signal, and inputs that value as an amount of energy into a microcomputer. To provide a control device for a friction screw press, in which the energy can be set without using a limit switch by comparing and calculating the amount of energy preset by a preset indicator, and the knockout device can also be controlled. It is something to do.

The details of the control device for the friction screw press of this invention will be explained below based on an embodiment shown in the accompanying drawings.

In the figure, A is a frame that includes a bed 1, uprights 2 on both sides of the bed, and both uprights 2.
It consists of a crown 3 with both ends placed on top, and these are firmly fastened by one or two pairs of tie rods 4 on the left and right sides.

Bearings 6 are provided on the stands 5 fixed to both sides of the upper part of the crown 3 to support both ends of the main shaft 7, and clutch cylinders 11 and 12 are provided at the outer ends of both bearings 6, respectively, so that the main shaft 7 can be moved to the right or left. It is configured to move slightly to the left.

13 and 14 are disk-shaped side disks fixed to the main shaft 7, and one of the disks 13
A transmission belt 16, which also serves as a pulley and is driven by a motor 15, extends around the outer periphery of the side disk 13.

Reference numeral 17 denotes a female screw provided on the crown 3. A screw 18 is screwed into this female screw 17, and side disks 13, 14 are attached to the upper end of this screw 18.
The flywheel 19 located in between is fixed.

Further, the lower end of the screw 18 is rotatably connected to the upper end of a slide member 20 that moves up and down between the uprights 2.

Reference numeral B designates a knockout device, which is comprised of a knockout pin 22 attached to a vertical hole in the bed 1 so as to be movable up and down, and a hydraulic cylinder 23 for raising and lowering this pin 22.

Reference numeral 25 in FIG. 2 denotes a pulse transmitter, and a rubber roller 26 fixed to the tip of its rotating shaft is pressed against the vicinity of the outer periphery of the lower surface of the flywheel 19.
For example, the pulse transmitter 25 is attached to a guide 27 fixed to the frame A as shown in FIG.

31 is a microcomputer to which the output circuit of the pulse generator 25 is connected. The computer 31 is also provided with, for example, three preset indicators 32, 33, and 34, so that any value can be preset.

35 is a controller connected to the output circuit of the computer 31, and the output circuit is connected to the solenoid coil of the electromagnetic switching valve (not shown) for the clutch cylinders 11 and 12 and the electromagnetic switching valve 36 for controlling the hydraulic cylinder 23. do. Further, the output circuit of the controller 35 is provided with, for example, three knockout selection switches 37, 38, and 39.

41 is an oil tank, 42 is a hydraulic pump driven by a motor 43, and these and the hydraulic cylinder 23
The aforementioned switching valve 36 is provided in the circuit connecting the two, and the circuit is further provided with a check valve, a relief valve, etc.

Next, the operation of the above embodiment will be explained for the case where the screw 18 has a right-hand thread. When the flywheel 19 is at the raised position, that is, at the machining start position, the motor 15 causes the side disks 13 and 14 to
is rotated in the direction of the arrow in FIG. 2, and the left clutch cylinder 11 is activated to bring only the left side disk 13 into contact with the outer periphery of the flywheel 19. When viewed from above, the flywheel 19 rotates to the right.
The screw 18 that rotates together with the female screw 1
7, the slide member 20 at the lower end is lowered, and press working is performed using molds fixed to the lower side and on the bed 1, respectively.

When the press work is completed, the clutch cylinder 11 is returned to its original position, and the clutch cylinder 12 is activated to bring only the right side disk 14 into contact with the outer periphery of the flywheel 19, and the flywheel 19 begins to rotate in reverse together with the screw 18 and rises. Then, the slide member 20 is raised.

In the above pressing process, the flywheel 19
The energy stored in can be calculated from the number of rotations (r, p, m) of the flywheel 19. Therefore, as shown in the figure, the pulse generator 25 is driven by the rubber roller 26 in contact with the flywheel 19, and its output pulses are input to the computer 31. on the other hand,
Since the energy required for each blow is input into the computer 31 in advance using the preset indicators 32, 33, and 34, the pulse transmitter 2
At the moment when the stored energy calculated from the rotational speed input from 5 to the computer 31 matches the preset energy, the clutch cylinder 11 returns to release the side disk 13 from the flywheel 19.

Therefore, from then on, the flywheel 19 freely rotates and descends together with the screw 18, performing pressing with a predetermined energy. That is,
The side disk 13 comes into contact with the outer periphery of the flywheel 19 in the raised position, and the flywheel 19 begins to rotate.As the flywheel 19 descends, the rotation of the flywheel 19 becomes faster and the energy increases. As soon as the value reaches the set value, the flywheel 19 is released and press working is performed using the set energy.

Therefore, when there are three preset indicators 32, 33, and 34 as in the illustrated example, it is assumed that there are three blows.
By changing the energy of press working in three stages,
Workpieces can be processed in three stages. However, depending on the type of product, processing with one blow or more than three blows can be performed.

Moreover, the product remains in the mold due to blowing during product processing. In such a blow, if the knock-out is selected in advance for each blow using the knock-out selection switches 37, 38, and 39, the switching valve will be activated when the press working by the selected blow is finished and the slide member 20 is raised. 36 operates the hydraulic cylinder 23 to raise the knockout pin 22 and knock out the product, after which the knockout pin 22 can be lowered to its original position.

As mentioned above, this invention uses a pulse transmitter that detects the rotational speed of the flywheel in a friction screw press, and a pulse signal emitted from this pulse transmitter that presets the amount of energy stored in the flywheel. A microcomputer compares and calculates the required amount of energy preset by the machine, and the signal processed by this microcomputer separates the flywheel and side disk, and the necessary energy stored in the flywheel is used to perform press processing. The device is equipped with a controller that operates a knock-out device that knocks out the product remaining in the mold at the end of the press process selected by the knock-out selection switch, so the energy during press processing can be accurately used. Since it can be set, the accuracy of press processing is improved.

In addition, as mentioned above, in the case of blowing, which has a knock-out device controlled by a controller and where there is a risk that the product may remain in the mold after pressing, the knock-out selection device may be used to determine whether the press processing is completed. At this point, the knock-out device automatically operates to knock out the product remaining in the mold, so the conventional manual switch operation for operating the knock-out device is no longer necessary, improving work efficiency and reducing the burden on workers. This has the effect of ensuring the safety of people.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an example of a friction screw press implementing the control device of this invention, and FIG. 2 is a longitudinal sectional side view including a circuit diagram of the same. 13, 14...Side disk, 18...Screw, 19...Flywheel, 20...Slide member, 22...Knockout pin, 23...Hydraulic cylinder, 25...Pulse transmitter, 31...Microcomputer , 32, 33, 34... preset indicator, 36... switching valve, B... knockout device.

Claims (1)

[Scope of utility model registration request] A rotating main shaft that can move horizontally is provided at the top of the frame, and a side disk and a clutch cylinder that moves the main shaft in the axial direction are provided at both ends of this main shaft, and a drive that drives one of the side disks is provided. A means is provided at the upper end of the screw screwed into the female screw provided in the center of the frame, and is located between the above-mentioned both side disks, and as the main shaft moves in the axial direction, the outer periphery is brought into contact with one of the side disks. The flywheel, which is free from both side disks, is fixed, and the lower end of the screw is rotatably connected to a sliding member in the frame, and a knock-out device driven by a hydraulic cylinder is installed at the lower end of the frame. In the friction screw press, a rubber roller is kept in constant contact with a certain point on the flywheel, and a pulse transmitter is provided which moves up and down together with the flywheel and converts the rotation of the rubber roller into a pulse signal, and at the start position of the flywheel processing, While one clutch cylinder is activated and one side disk is driving the flywheel in the machining direction, the amount of energy stored in the flywheel is determined by the pulse signal emitted from the pulse transmitter. A microcomputer compares and calculates the required amount of energy preset by , and the signal processed by this microcomputer sets both clutch cylinders to neutral, separates the flywheel and side disk, and stores the energy in the flywheel. The function is to perform press processing using the necessary energy, and when the press process selected by the knock-out selection switch is completed, the knock-out device is activated by the hydraulic cylinder of the knock-out device to knock out the product remaining in the mold. A friction screw press control device equipped with a controller that performs the following functions.