JPH05215537A - Forming length measuring device for forging rolls - Google Patents

Abstract

(57) [Summary] [Object] To provide an apparatus for automatically measuring the length of a work formed by a forging roll during the forming process. [Structure] A strain detector (35) is attached to a frame (31-2) supporting a roll shaft (32-1, 32-2). An angle detector (34) for detecting the rotation angle is attached to one roll shaft. The manipulator (10) has a movement amount detector (1) for detecting a movement amount C of the tongue shaft (12) when the relief mechanism (14) is operated.
6) is provided. The arithmetic unit utilizes the detection angle of the angle detector from the start of rotation of the forging roll to the fall of the detection signal from the strain detector accompanying the end of pressurization, and the outer cylinder (13) of the manipulator. Of the roll center of the tong shaft at the roll origin position of the workpiece, which is measured in advance, by calculating the movement amount D of the workpiece and adding the movement amount C detected by the movement amount detector to the movement amount D. The length A is subtracted to calculate the total length of the work.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for automatically measuring the length of a work formed by a forging roll during the forming process.

[0002]

2. Description of the Related Art Generally, a work forging roll is formed by passing a work held by a manipulator between two forging rolls as a pretreatment process. It is usually transferred to an automatic forging press as a process. Even in the post-treatment process, the work is automatically placed at a predetermined position of the automatic forging press by the gripping means. In this case, the length of the work after forming has a great influence on the quality of the forged product.

The cause of the variation in the length of the work is considered to be that the cutting length of the material changes and that the amount by which the material peels off as a scale from heating changes.

[0004]

That is, if there is a variation in the length of the work, the work may be set at a position deviated from the predetermined position of the automatic forging press due to the variation, and as a result, , Forged products may have defects such as scratches and lack of wall. Therefore, it is preferable that the work obtained in the pretreatment step is rejected in the stage of conveyance to the posttreatment step when the variation in length after molding exceeds the allowable range.

In view of such necessity, an object of the present invention is to provide a forging roll forming length measuring device capable of automatically measuring the length of a work formed by a forging roll during the forming process. To do.

[0006]

According to the present invention, there is provided a device for measuring the length of a work formed by a forging roll, which is attached to a frame supporting a roll shaft and starts pressurization and A detector that detects the behavior of the roll shaft at the end of pressurization, an angle detector that detects the rotation angle of the roll shaft, and the rise and rise of the detection signal from the detector at the start and end of pressurization. A forming length measuring device for a forging roll is provided, which is provided with a calculation unit that calculates the forming length of the work by utilizing the detection angles θ1 and θ2 of the angle detector at the time of lowering.

According to the present invention, a tongue shaft having a tongue for holding a work, an outer cylinder for accommodating the tongue shaft and moving together with the tongue shaft in synchronization with the rotation of the forging roll, and the tongue shaft are provided. Formed by the forging roll combined with a manipulator having a tongue shaft relief mechanism that allows only the tongue shaft to move relative to the outer cylinder when a stress of a predetermined value or more acts in the axial direction. A device for measuring the length of a work, which is attached to a frame supporting the roll shaft, and a detector for detecting the behavior of the roll shaft at the start and end of pressurization,
An angle detector that detects a rotation angle of the roll shaft, a movement amount detector that detects a movement amount C of the tongue shaft when the relief mechanism is activated, and a pressurization end from the start of pressurization of the forging roll. The movement amount D of the outer cylinder is calculated by using the detection angle of the angle detector until the fall of the detection signal from the detector accompanying the movement of the detection signal, and the movement amount D is calculated by the movement amount detector. And an arithmetic unit for calculating the total length of the work by adding the detected movement amount C and subtracting the length A from the roll center of the tongue shaft at the roll origin position measured in advance. A characteristic forging roll forming length measuring device is obtained.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a view for explaining a pretreatment process of a work by a forging roll, and shows a positional relationship among a manipulator 10, a work 20 and a forging roll 30 immediately after forming by the forging roll. The manipulator 10 includes a tongue shaft 12 having a tongue 11 for gripping a work 20, an outer cylinder 13 that houses the tongue shaft 12, and moves together with the tongue shaft 12 in synchronization with the rotation of the forging roll 30 and the tongue shaft 12. A tongue shaft relief mechanism 14 is provided to allow only the tongue shaft 12 to move relative to the outer cylinder 13 when a stress of a predetermined value or more acts in the axial direction. Release mechanism 1
No. 4 injects the pressure oil 15 into the cylinder portion 14-1 formed on the inner wall on one end side of the outer cylinder 13 so that a part of the tongue shaft 12 acts as a piston, and stress is applied to the tongue shaft 12. Thus, when the pressure in the cylinder portion 14-1 reaches a predetermined value or more, the pressure oil 15 is discharged to the outside of the outer cylinder 13 so that the tongue shaft 12 can move relative to the outer cylinder 13. It has a function as a valve. Although not shown, the pressure oil discharged to the outside of the outer cylinder 13 is used as the tongue shaft 12
When it returns to the original position, it returns to the inside of the cylinder portion 14-1.

The forging roll 30, as shown in FIG.
Two roll shafts 32-1 and 32-2 are rotatably provided vertically between the drive frame 31-1 and the side frame 31-2, and the roll shafts 32-1 and 32-2 respectively have The molds 33-1 and 33-2 are attached. In addition,
A plurality of metal molds are attached to each roll shaft in the axial direction (four in this case), and the work 20 is subjected to pressure molding a plurality of times (4 times). A rotation drive system (not shown) for the roll shafts 32-1 and 32-2 is housed in the drive frame 31-1, and one roll shaft 32-1 has an encoder 34 for detecting the rotation angle thereof. Have been combined. Further, the side frame 31-2 is provided with a strain detector 35 for detecting the amount of strain acting on the side frame 31-2 at the time of pressure molding between the mounting portions of the roll shafts 32-1 and 32-2. Has been done.

Returning to FIG. 1, the roll shaft 32-1 is also provided with a cam 40 so as to rotate in synchronization therewith. The cam 40 is combined with a link mechanism 42, one end of which is connected to the piston 41-1 of the cylinder mechanism 41 and the other end of which is connected to the outer cylinder 13. The tong shaft 12 is connected to the outer cylinder according to the rotation angle of the cam 40. It is configured so as to separate from and approach the forging roll 30 together with 13. That is, cam 4
The tong shaft 12 together with the outer cylinder 13 is configured to separate from and approach the forging roll 30 once while 0 rotates once. More specifically, before the start of molding, the work 20 held by the manipulator 10 and the molds 33-1 and 3 are connected.
3-2 (the leftmost mold in FIG. 2) has a positional relationship as shown in FIG. When the rotation of the roll shafts 32-1 and 32-2 starts, the tongue shaft 12 moves together with the outer cylinder 13 in the direction away from the forging roll 30 by the cam 40 and the link mechanism 42, and as shown in FIG. Mold 33 at angle θ1
-1, 33-2 starts pressure molding. And FIG.
As shown in, even if the pressure molding is completed at the rotation angle θ2, the roll shafts 32-1 and 32-2 continue to rotate, and the mold 33-
When the parts without 1, 33-2 start to face each other, the action of the cam 40 causes the tongue shaft 12 to move in the direction of approaching the forging roll 30 together with the outer cylinder 13 and the manipulator 10 as a whole in the horizontal direction (Fig. 1 is driven in the direction from the front side to the back side of the middle paper surface). As a result, the work 20 moves through the space between the roll shafts 32-1 and 32-2, and is set at a position corresponding to the next die (second die from the left side in FIG. 2). At this time, the molds 33-1 and 3
3-2 has rotated once to a position similar to that shown in FIG. 3, and subsequently, pressure molding similar to that described above is performed by the second mold.

In FIG. 4, the work 20 has a non-processed part which is not processed by the forging roll 30, but the length L0 of the non-processed part is constant with respect to the determined work.

Referring to FIG. 6, the measuring apparatus according to the present invention performs the predetermined calculation based on the encoder 34, the strain detector 35, the set value input section 36, and signals from these, and the workpiece. Calculation unit 3 for calculating the length of 20
Including 7 and. The values input from the set value input unit 36 include the length A from the roll center of the tongue shaft at the roll origin position shown in FIG. 3, the average contact radius R of the molds 33-1 and 33-2, and There is an allowable range value of the length of the work 20 (two types regarding the length of only the processed portion and the total length).

First, a first embodiment for calculating the length of the molded portion of the work 20 will be described. When the rotation of the roll shafts 32-1 and 32-2 starts from the state of FIG. 3, the encoder 34 outputs a rotation angle detection signal, while the tongue shaft 12 moves in a direction away from the forging roll 30 together with the outer cylinder 13. , As shown in FIG. 4, the mold 33 is rotated at the rotation angle θ1.
-1, 33-2 starts pressure molding. At this time, since stress acts on the side frame 31-2 via the roll shafts 32-1 and 32-2, the detection signal from the strain detector 35 rapidly rises as shown in FIG. And
When the pressure molding is completed at the rotation angle θ2 in the state shown in FIG. 5, the detection signal from the strain detector 35 suddenly falls as shown in FIG. The computing unit 37 detects the rising and falling edges of the detection signal by passing the detection signal from the strain detector 35 through a differentiating circuit, and the rotation angle θ1 at that time,
θ2 is detected by the rotation angle detection signal from the encoder 34. Note that, instead of the strain detector 35 that detects the behavior of the roll shaft at the start and end of pressurization as the displacement of the frame, the strain detector 35 detects the behavior of the roll shaft due to the radial direction clearance by a magnescale or the like. It is also possible to replace with the detection signal from.

The calculation unit 37 further performs the following calculation using the average contact radius R and the detected rotation angles θ1 and θ2 to calculate the length L1 of the forming portion of the work 20.

L1 = 2πR × (θ2-θ1) / 360 If the calculated length L1 is within the permissible range input from the set value input unit 36, a signal indicating that is output and the permissible value is accepted. If it is out of the range, a signal indicating that it should be rejected is output in the process of conveying the molded work 20 to the automatic forging press as a post-treatment process. It is preferable that the above-described measurement be performed in the final forming step using the forging roll 30.

By the way, in forming by the forging roll 30 as shown in FIG. 1, the mold 33-1 at the start of pressurization shown in FIG.
33-2 applies a force to move the work 20 leftward in the drawing. The moving speed due to this force is the forging roll 3
Since it does not synchronize with the rotation of 0 and is faster than the moving speed by the link mechanism 42, the above-mentioned relief mechanism 14 operates and only the tongue shaft 12 moves by the distance C relative to the outer cylinder 13. After that, the tongue shaft 12 moves together with the outer cylinder 13 at a speed determined by the cam 40. Since the moving distance C cannot be grasped from the rotation angle from the encoder 34, the outer cylinder 13
It is detected by a gap sensor (for example, a linear encoder, a magnet scale, etc.) 16 installed at one end of the.

A second embodiment of the present invention in which the total length L of the work 20 is accurately measured in consideration of the movement distance C will be described below.

From the state shown in FIG. 3, the roll shafts 32-1 and 32-
When the rotation of 2 starts, the encoder 34 outputs a rotation angle detection signal. On the other hand, the tongue shaft 12 moves together with the outer cylinder 13 in a direction away from the forging roll 30, and as shown in FIG. 4, pressure molding by the molds 33-1 and 33-2 starts at a rotation angle θ1. At this time, since stress acts on the side frame 31-2 via the roll shafts 32-1 and 32-2, the detection signal from the strain detector 35 rapidly rises as shown in FIG. Then, when the pressure molding is completed at the rotation angle θ2 in the state shown in FIG. 5, the detection signal from the strain detector 35 suddenly falls as shown in FIG. 7. The computing unit 37 detects the trailing edge of the detection signal by passing the detection signal from the strain detector 35 through a differentiating circuit or the like, and detects the rotation angle θ2 at that time from the rotation angle detection signal from the encoder 34.

The calculation unit 37 also calculates the movement distance D of the outer cylinder 13 (workpiece 20) driven by the cam 40 and the link mechanism 42 from the rotation angle θ2 based on a predetermined formula. It should be noted that this moving distance D is obtained by previously measuring the correspondence relationship between the rotation angle and the moving distance as shown in FIG. 8 and storing it in the storage unit in the calculating unit 37.
The moving distance corresponding to the rotation angle may be read from the storage unit. The calculation unit 37 further calculates the calculated movement distance D.
Is calculated by adding the moving distance C detected by the gap sensor 16 and subtracting the set value A from the set value input unit 36.

The calculation unit 37 outputs a signal indicating that the calculated total length L is within the permissible range for the total length input from the set value input unit 36, and if the calculated total length L is outside the permissible range, the molded work 20 is formed. A signal indicating that it should be rejected is output in the process of being transferred to the automatic forging press as a post-treatment process.

[0021]

As described above, according to the present invention, it is possible to automatically measure the length of the work formed by the forging roll during the forming process, thereby utilizing the signal from the measuring device. Then, it is possible to configure a transfer system that keeps the variation in the length of the work sent to the automatic forging press in the next step within a certain value.
This has a great effect on improving the quality of molded products and shortening the molding process time when considering a system including a pretreatment process using a forging roll, a conveying process, and a post-treatment process using an automatic forging press.

[Brief description of drawings]

FIG. 1 is a diagram for explaining a forming process using a forging roll to which the present invention is applied.

2 is a schematic perspective view for explaining the forging roll shown in FIG.

FIG. 3 is a diagram showing a positional relationship between a forging roll and a work before the start of forming.

FIG. 4 is a diagram showing a positional relationship between a forging roll and a work at the start of pressure molding.

FIG. 5 is a diagram showing a positional relationship between a forging roll and a work after completion of pressure molding.

FIG. 6 is a block diagram showing a configuration of a molding length measuring device according to the present invention.

7 is a diagram showing an example of a detection signal from the distortion detector shown in FIG.

FIG. 8 is a rotation angle θ of the forging roll (roll shaft) shown in FIG. 1 and a movement amount D of a work moved by a link mechanism.
FIG.

[Explanation of symbols]

 10 Manipulator 12 Tongue Shaft 13 Outer Cylinder 20 Work 30 Forging Roll 34 Encoder 35 Strain Detector 40 Cam 42 Link Mechanism

Claims (2)

[Claims] 1. An apparatus for measuring the length of a work (20) formed by a forging roll (30), the frame (31) supporting a roll shaft (32-1, 32-2).
-2), a detector (35) for detecting the behavior of the roll shaft at the start and end of pressurization, an angle detector (34) for detecting the rotation angle of the roll shaft, and the pressurization. Calculation for calculating the forming length of the work by using the detection angles θ1 and θ2 of the angle detector (34) at the rising and falling edges of the detection signal from the detector (35) at the start and end of pressurization. A forming length measuring device for a forging roll, which is provided with: 2. A tongue (1) for gripping a work (20).
1) with a tongue shaft (12), an outer cylinder (13) that houses the tongue shaft and moves together with the tongue shaft in synchronization with the rotation of the forging roll (30), and in the axial direction with respect to the tongue shaft. The forging roll combined with a manipulator (10) having a tongue shaft relief mechanism (14) that allows only the tongue shaft to move relative to the outer cylinder when a stress of a predetermined value or more is applied. A device for measuring the length of a work formed by the method, comprising:
2-2) is attached to the frame (31-2) supporting the detector (35) for detecting the behavior of the roll shaft at the start and end of pressurization and the rotation angle of the roll shaft. An angle detector (34) for detecting, a movement amount detector (16) for detecting a movement amount C of the tongue shaft when the relief mechanism is operated, and a pressurization end from a pressurization start time of the forging roll. The movement amount D of the outer cylinder is calculated using the detection angle of the angle detector (34) until the fall of the detection signal from the detector (35), and the movement amount D is A calculation unit that calculates the total length of the work by adding the movement amount C detected by the movement amount detector and subtracting the length A from the roll center of the tongs shaft at the roll origin position measured in advance. 37) and a forged roll characterized by Forming length measuring device.