JPH11226796A - High precise c type frame press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high precise C type frame press, with which the high precise formation can be obtd. SOLUTION: In the C type frame press provided with the C type frame 2 having an opening part 9 at the front part, an opening degree detector 12 for detecting the opening degree of the opening part 9 in the C type frame 2, a C-shaped notch part 8 opened toward almost the opposite direction to the opening part 9 in the end part at the opposite side of the opening part 9, a notch part driving means for controlling the opening degree of this notch part 8 and a control device for driving the notch driving means so that a deviation value between the detected opening degree and a prescribed reference value becomes small, are provided. The opening degree detector 12 detects a parallel degree of the slide 4 as the opening degree of the opening part 9 or the opening degree of the notch part 8. The notch part driving means is provided with a hydraulic cylinder 11 for controlling the opening degree of the notch part 8 or an AC servo motor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in the molding accuracy of a C-type frame press having a substantially C-shaped frame (hereinafter referred to as a "C-type frame") on the side surface when pressing.

[0002]

2. Description of the Related Art Conventionally, press machines are classified into a gate type frame press and a C type frame press depending on the shape of the frame. Among them, the portal type frame press is approximately 4 in plan view.
It has the same strength uprights (pillars) at the four corners of the quadrilateral,
The upright suppresses the distortion of the frame due to the pressing load during molding. Therefore, the portal press is generally suitable for high-precision processing, but the production cost is extremely high.

[0003] On the other hand, C-type frame presses are generally
The strength member portion on the side surface receiving the pressing load has an opening at the front, and is formed of a C-shaped frame having a plate thickness of about 40 mm or more, and the other frame is formed of a thin plate of about 30 mm. It has a simple structure. Therefore, the C-type frame press is inexpensive in manufacturing cost as compared with the portal frame, and has no upright, so that the mold can be easily taken in and out, and is used in a wide field as a general-purpose press machine.

[0004]

However, in the conventional C-shaped frame press, even if the molding is performed at the center of the slide, when the molding load is large, the opening of the C-shaped frame causes the opening phenomenon. In some cases, the parallelism of the slide cannot be maintained. Since the accuracy of the parallelism affects the molding accuracy of the processed product, there arises a problem that a C-type frame press cannot be employed when precise molding accuracy is required.

As a countermeasure for suppressing the opening phenomenon, a thick bar (opening preventing bar) is provided between the upper and lower front ends across the openings of the left and right C-shaped frames.
Although there is an example of a C-type frame press in which the connection is made by the above-described method, the molding accuracy at this time is still lower than the molding accuracy by the portal frame. In addition, the size of the mold that can be used is restricted by the distance between the left and right opening prevention bars, so that the moldable product must be limited. Therefore, there is a problem that versatility is reduced.

The present invention has been made in view of the above-mentioned problems, and has as its object to provide a high-precision C-type frame press capable of high-precision molding.

[0007]

In order to achieve the above object, the invention according to claim 1 has an opening 9 at a front portion and is substantially C-shaped in side view. In the C-type frame press provided with the C-type frame 2 having the shape shown in FIG. 1, an aperture detector 12 for detecting the aperture of the opening 9 of the C-type frame 2, and opposite to the opening 9 of the C-type frame 2. A C-shaped notch 8 opened in a direction substantially opposite to the opening 9 at the end on the side thereof;
Notch driving means 10 for controlling the opening degree of the notch and the notch driving means 1 so that the deviation value between the opening degree inputted from the opening degree detector 12 and a predetermined reference value becomes small.
And a controller 20 that calculates a control command value of 0 and drives the cutout portion driving means 10 based on the control command value.

According to the first aspect of the present invention, a C-shaped notch is provided at an end of the C-shaped frame opposite to the opening at the front of the C-shaped frame, and is opened in a direction opposite to the opening. The opening degree of the C-shaped frame is controlled by utilizing the fact that the opening degree of the opening of the C-shaped frame due to the increase in the slide load and the opening degree of the notch have an opposite relationship. I have. That is, the opening degree detector detects the current opening degree of the C-shaped frame, and drives the notch driving means 10 so that the deviation between the opening degree and the predetermined reference value becomes small, thereby opening the notch. Controlling the degree. Thus, the degree of opening of the C-shaped frame can be reduced, so that high-precision molding can be performed.

According to a second aspect of the present invention, in the high-precision C-type frame press according to the first aspect, the aperture detector 12 determines the parallelism of the slide 4 as the aperture of the opening 9 of the C-frame. Has been detected.

According to the second aspect of the present invention, since the parallelism of the slide is detected as the aperture of the front part of the C-shaped frame, the aperture can be accurately detected. Therefore,
The degree of opening of the C-shaped frame can be controlled with high accuracy, and high-precision molding can be performed.

According to a third aspect of the present invention, in the high-precision C-shaped frame press according to the first aspect, the opening degree detector 12 determines the opening degree of the opening 9 of the C-shaped frame as the notch 8. Is detected.

According to the third aspect of the invention, the opening degree of the notch can be detected as the opening degree of the C-shaped frame. As a result, the degree of opening of the C-shaped frame can be controlled, and high-precision molding can be performed.

According to a fourth aspect of the present invention, in the high-precision C-shaped frame press according to the first aspect, the notch driving means 10 includes a hydraulic cylinder 11 for controlling an opening degree of the notch 8. I have.

According to the fourth aspect of the present invention, the opening degree of the C-shaped frame can be controlled by controlling the opening degree of the notch using the hydraulic cylinder. Therefore,
High-precision molding becomes possible.

According to a fifth aspect of the present invention, in the high-precision C-type frame press according to the first aspect, the notch driving means 10 includes an AC servomotor 15 for controlling an opening degree of the notch 8. ing.

According to the fifth aspect of the invention, the opening degree of the C-shaped frame can be controlled by controlling the opening degree of the notch using the AC servomotor. Therefore, high-precision molding processing becomes possible.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the drawings. 1st Embodiment is described based on FIG. 1 and FIG. FIG. 1 shows a side view of a hydraulic direct acting press having a C-shaped frame.
In FIG. 1, a C-shaped frame 2 having an opening 9 at the front is provided on the left and right side surfaces of the direct-acting press 1. A bolster 3 is provided below the direct-acting press 1, and a slide 4 is provided on the upper portion at a position facing the bolster 3 so as to be vertically movable. The slide 4 is connected to a hydraulic cylinder 5 and moves up and down by the expansion and contraction of the hydraulic cylinder 5. Further, between the rear end of the slide 4 and the C-shaped frame 2, a slide position detector 7 composed of, for example, a linear sensor or the like is provided. The slide position detector 7 moves the slide 4 in accordance with the vertical movement of the slide 4.
Is detected from the bolster 3.

[0018] At the ends of the left and right C-shaped frames 2 and 2 on the opposite side to the opening 9 (that is, the rear part of the press), substantially C-shaped openings are formed facing the opening direction of the opening 9 respectively. It has cutouts 8 in the shape of a letter. The upper and lower surfaces of the left and right cutouts 8, 8 are provided with horizontal members 6a, 6 having a predetermined plate thickness for connecting the left and right upper surfaces and the lower surface, respectively.
b is fixed. The horizontal members 6a, 6b
A hydraulic cylinder 11 that can be extended and contracted in a direction in which the degree of opening of the cutouts 8 and 8 can be controlled is disposed therebetween. Further, an opening degree detector 12 composed of, for example, an eddy current type displacement sensor capable of detecting a very precise amount of displacement is provided at the tip of the notch 8 in the opening direction. 12, the opening degree of the notch 8 is detected as the opening degree of the C-shaped frame 2. That is, the phenomenon that the opening degree of the notch 8 decreases in proportion to the opening degree of the C-shaped frame 2 increases.

Next, a control block diagram of the high-precision C-type frame press according to the present embodiment shown in FIG. 2 will be described. The slide driving means 21 drives the slide 4, and in the present embodiment, the above-described hydraulic cylinder 5
And a flow control valve (not shown) for controlling the flow rate and direction of hydraulic oil discharged from a hydraulic pump (not shown) to the hydraulic cylinder 5. The slide position detector 7 detects the vertical position (height) of the slide 4 and outputs this position signal to the controller 20. The notch drive means 10 controls the degree of opening of the notch 8, and in this embodiment, the hydraulic cylinder 11 and the hydraulic cylinder 11 of the hydraulic oil from the hydraulic pump are used.
And a flow rate control valve (not shown) for controlling the flow rate and the direction thereof. The aperture detector 12 detects the aperture of the C-shaped frame 2 as described above, and outputs this aperture signal to the controller 20.

The controller 20 is mainly composed of a computer device such as a microcomputer, for example, and performs a predetermined process based on a position signal input from the slide position detector 7 so that the slide 4 The control command value to the slide drive means 21 is calculated and output so as to be driven in accordance with the slide motion. Also,
Further, the controller 20 performs a predetermined process based on the opening degree signal input from the opening degree detector 12, and detects the detected opening degree and the opening degree reference value when the pressing load by the slide 4 is not applied. Is calculated and output so as to reduce the deviation of.

Next, the operation of the above configuration will be described.
The controller 20 drives and lowers the slide 4 in accordance with a predetermined slide motion stored in advance, and enters a pressurization process. When a load due to the slide 4 is applied to the workpiece at the time of pressurization, a reaction force from the workpiece is applied to the frame via the slide 4, and thus the opening degree of the opening 9 of the C-shaped frame 2 increases. At this time, as the opening degree increases, the opening degree of the notch 8 decreases. The controller 20 previously stores an opening degree reference value when no sliding load is applied, and calculates a deviation value between the current opening degree input from the opening degree detector 12 and this opening degree reference value. Then, a control command value is calculated so as to reduce the deviation value and is output to the notch portion driving means 10. As a result, the notch driving means 10 is controlled in the direction in which the notch 8 becomes larger, so that the degree of opening of the C-shaped frame is reduced and the slide 4 is returned parallel.

Next, a second embodiment will be described with reference to FIGS. FIG. 3 shows a side view of a direct-acting press explaining the present embodiment. In FIG. 1, FIG.
The same reference numerals are given to the same components as those described above, and the description thereof will be omitted. As the aperture detector 12 for detecting the aperture of the C-shaped frame, in the present embodiment, two slide position detectors 7 and 1 for detecting the parallelism of the slide 4.
7 is provided. The slide position detector 7 is attached between the rear part of the slide 4 and the C-shaped frame 2 as in the previous embodiment, and detects the height position of the rear end side of the slide 4. The slide position detector 17 is attached between the front part of the slide 4 and the C-shaped frame 2,
Similarly, the position in the height direction on the front end side of the slide 4 is detected. Then, both position signals are input to the controller 20.

An AC servomotor 15 and a ball screw 16 connected to the motor output rotary shaft are provided between the horizontal members 6a and 6b of the notch 8, and the rotational driving force of the AC servomotor 15 is provided. Is converted into a linear driving force by the ball screw 16 to control the opening degree of the notch 8.

Next, a description will be given based on a control block diagram shown in FIG. Here, the same components as those in FIG. 2 are denoted by the same reference numerals, and description thereof is omitted. In the present embodiment, the notch driving unit 10 includes the ball screw 16 and the AC servomotor 15, and a servo amplifier (not shown) that controls a drive current of the AC servomotor 15. The aperture detector 12 in the present embodiment is composed of the two slide position detectors 7 and 17 described above. Based on the two position signals, the parallelism of the slide 4 is calculated based on the height of the slide 4. It is measured as a forward / backward tilt.

The operation of the above configuration will be described. Controller 2
0 calculates the control command to the slide driving means 21 while feeding back the position signal of the slide position detector 7 so that the slide 4 is driven along a predetermined slide motion, and calculates the speed and the position of the slide 4. Control. During the pressurizing process, the controller 20 controls the opening degree detected by the opening degree detector 12, that is, the slide parallelism detected by the two slide position detectors 7 and 17, and a predetermined reference value stored in advance. (Parallelism when no load is applied). As a result of this comparison, the notch portion drive is performed so that the deviation between the current parallelism and the reference value is reduced, that is, the detected difference between the front and rear heights of the slide 4 falls within a predetermined allowable value. The control command to the means 10 is calculated and output. Thereby, the notch driving means 1
0 controls the opening / closing degree of the notch 8 so that the slide 4 is parallel.

As described above, according to the present invention, C
At the end of the mold frame 2 on the side opposite to the opening 9, the notch 8 is provided in a substantially C-shape so as to face the side opposite to the opening direction of the opening 9. When the opening degree of the opening 9 of the C-shaped frame 2 increases, the opening degree of the notch 8 decreases. Based on this phenomenon, the current opening degree of the opening 9 of the C-shaped frame 2 is detected, and the opening degree of the notch 8 is controlled so as to reduce the deviation between the opening degree and a predetermined reference value. By doing so, the opening degree 9 of the C-shaped frame can be reduced, and the parallelism of the slide 4 can be maintained within a predetermined value.
As a result, high-precision molding can be performed by the C-type frame press.

In the above description, an example of a hydraulic direct-acting press using a hydraulic cylinder 5 as a means for driving the slide 4 has been described, but the present invention is not limited to this. For example, the present invention can be applied to the case of an electric servo press using an electric servo motor as a slide driving unit.

[Brief description of the drawings]

FIG. 1 shows a side view of a hydraulic direct acting press having a C-shaped frame according to a first embodiment.

FIG. 2 is a control block diagram illustrating a first embodiment.

FIG. 3 is a side view of a linear motion press illustrating a second embodiment.

FIG. 4 is a control block diagram illustrating a second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Linear press 2 C-type frame 4 Slide 5 Hydraulic cylinder 7 Slide position detector 8 Notch 9 Opening 10 Notch drive means 11 Hydraulic cylinder 12 Opening detector 15 AC servomotor 17 Slide position detector 20 Controller 21 Slide drive means

Claims (5)

[Claims] A C-shaped frame having an opening (9) in a front part and a C-shaped frame (2) having a substantially C-shape in side view.
In the mold frame press, an opening degree detector (12) for detecting the opening degree of the opening (9) of the C-shaped frame (2), and an opening degree detector (12) of the C-shaped frame (2) opposite to the opening (9). At the end,
A C-shaped notch (8) opened in a direction substantially opposite to the opening (9); a notch driving means (10) for controlling the degree of opening of the notch (8); A control command value of the notch driving means (10) is calculated so that a deviation value between the opening degree input from the opening degree detector (12) and a predetermined reference value is reduced. A controller (20) for driving the notch driving means (10) based on the controller (20)
A high-precision C-type frame press comprising: 2. The high-precision C-shaped frame press according to claim 1, wherein the aperture detector (12) is provided in an opening of the C-shaped frame.
(9) A high-precision C-type frame press characterized by detecting the parallelism of the slide 4 as the opening degree. 3. The high-precision C-shaped frame press according to claim 1, wherein the opening degree detector (12) is an opening of the C-shaped frame.
(9) A high-precision C-type frame press characterized by detecting the opening degree of the notch (8) as the opening degree of (9). 4. The high-precision C-type according to claim 1, wherein said notch drive means (10) includes a hydraulic cylinder (11) for controlling an opening degree of said notch (8). Frame press. 5. The high-precision C according to claim 1, wherein said notch driving means (10) includes an AC servomotor (15) for controlling an opening degree of said notch (8). Mold frame press.