JP2946368B2 - Forming length measuring device for forging rolls - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art In general, in forming a work by a forging roll, a work gripped by a manipulator is formed as a pretreatment step by passing the work between two forging rolls. It is usually conveyed to an automatic forging press as a process. In the post-processing step, 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.

It is considered that the cause of the variation in the length of the work is that the cut length of the material changes, and the amount of the material that peels off as a scale by 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 a predetermined position of the automatic forging press by the variation, and as a result In addition, forged products may have defects such as scratches and underfills. Therefore, it is preferable that the work obtained in the pre-processing step be rejected at the stage of transportation to the post-processing step if the variation in the length after molding exceeds an allowable range.

[0005] In view of such a need, an object of the present invention is to provide a forging roll forming length measuring apparatus capable of automatically measuring the length of a work formed by the forging roll during the forming process. Is to do.

[0006]

According to the present invention, there is provided an apparatus for measuring the length of a work formed by a forging roll, which is mounted on a frame supporting a roll shaft, and which 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 a detection signal from the detector at the start and end of pressurization A calculating unit for calculating the forming length of the work using the detection angles θ1 and θ2 of the angle detector at the time of descent.

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

[0008]

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 between a manipulator 10, a work 20, and a forging roll 30 immediately after forming by the forging roll. The manipulator 10 is provided with a tongue shaft 12 having a tongue 11 for gripping a work 20 and an outer cylinder 13 and a tongue shaft 12 which house the tongue shaft 12 and move in synchronization with the rotation of the forging roll 30 together with the tongue shaft 12. A tongue shaft relief mechanism 14 that allows only the tongue shaft 12 to move relative to the outer cylinder 13 when a stress equal to or more than a predetermined value acts in the axial direction. Escape mechanism 1
4 injects pressure oil 15 into a 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. As a result, when the pressure in the cylinder portion 14-1 reaches a predetermined value or more, the pressure oil 15 is discharged out of the outer cylinder 13 so that the tongue shaft 12 can move relative to the outer cylinder 13, so to speak, relief. Has a function as a valve. Although not shown, the pressure oil discharged out of the outer cylinder 13 is applied to the tongue shaft 12.
Is returned to the cylinder portion 14-1 when it returns to the original position.

[0009] As shown in FIG.
Two roll shafts 32-1 and 32-2 are rotatably suspended vertically between the drive frame 31-1 and the side frame 31-2. It is formed by attaching molds 33-1 and 33-2. In addition,
A plurality of dies are mounted side by side (here, four) on each roll shaft in the axial direction so that the work 20 is subjected to pressure forming a plurality of times (four times). A rotation drive system (not shown) for the roll shafts 32-1 and 32-2 is housed in the drive frame 31-1. One of the roll shafts 32-1 has an encoder 34 for detecting the rotation angle thereof. Are combined. In addition, a strain detector 35 for detecting the amount of strain acting on the side frame 31-2 at the time of press forming is installed between the mounting portions of the roll shafts 32-1 and 32-2 on the side frame 31-2. Have been.

Returning to FIG. 1, a cam 40 is provided on the roll shaft 32-1 so as to rotate in synchronization therewith. The cam 40 is combined with a link mechanism 42 having one end connected to the piston 41-1 of the cylinder mechanism 41 and the other end connected to the outer cylinder 13, and the tongue shaft 12 is connected to the outer cylinder in accordance with the rotation angle of the cam 40. 13 together with the forging roll 30. That is, the cam 4
The tongue shaft 12 is configured to separate and approach the forging roll 30 once together with the outer cylinder 13 during one rotation of 0. More specifically, the workpiece 20 gripped by the manipulator 10 and the dies 33-1 and 3-3 before the start of molding.
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 in the direction away from the forging roll 30 together with the outer cylinder 13 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 the figure, even if the pressure forming is completed at the rotation angle θ2, the roll shafts 32-1 and 32-2 continue to rotate, and the mold 33-
When the portions without 1, 33-2 begin to face each other, the tongue shaft 12 moves together with the outer cylinder 13 in the direction approaching the forging roll 30 by the action of the cam 40, and the entire manipulator 10 is moved horizontally (see FIG. 1 in a direction from the front side to the back side of the 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 mold (the second mold from the left in FIG. 2). At this time, the molds 33-1 and 3-3
3-2 rotates once to the same position as in FIG. 3, and subsequently, the same pressure molding as described above is performed by the second mold.

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

Referring to FIG. 6, a measuring apparatus according to the present invention performs a predetermined operation based on an encoder 34, a distortion detector 35, a set value input unit 36, and signals from these units, and Calculation unit 3 for calculating the length of 20
7 is included. The values input from the set value input unit 36 include the length A from the roll center of the tongue axis 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 of the length of 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 shown in FIG. 3, the encoder 34 outputs a rotation angle detection signal, and the tongue shaft 12 moves together with the outer cylinder 13 in a direction away from the forging roll 30. 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 a 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 forming is completed at the rotation angle θ2 in the state shown in FIG. 5, the detection signal from the strain detector 35 falls sharply as shown in FIG. The arithmetic unit 37 detects the rise and fall of the detection signal by passing the detection signal from the distortion detector 35 through a differentiating circuit or the like, and detects the rotation angle θ1,
θ2 is detected by a rotation angle detection signal from the encoder 34. Instead of the strain detector 35 for detecting the behavior of the roll shaft at the start of pressurization and the end of pressurization as the displacement of the frame, the behavior due to the radial gap of the roll shaft is detected 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 molded portion of the work 20.

L1 = 2πR × (θ2−θ1) / 360 If the calculated length L1 is within the allowable range inputted from the set value input unit 36, the arithmetic unit 37 outputs a signal indicating that, and If it is out of the range, a signal indicating rejection is output in the process of transporting the formed work 20 to the automatic forging press as a post-processing step. It is preferable that the above measurement be performed in the last forming step using the forging roll 30.

By the way, in the forming by the forging roll 30 as shown in FIG. 1, at the start of pressing shown in FIG.
A force for moving the work 20 to the left in the drawing acts on the work 20 by 33-2. The moving speed by this force is
Since the movement speed is faster than the movement speed of the link mechanism 42 without being synchronized with the rotation of 0, the above-described relief mechanism 14 operates, and only the tongue shaft 12 moves by the distance C relative to the outer cylinder 13. Thereafter, 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 determined from the rotation angle from the encoder 34, the outer cylinder 13
Is detected by a gap sensor (for example, a linear encoder, a magnescale, etc.) 16 installed at one end of the sensor.

A second embodiment of the present invention for accurately measuring the total length L of the work 20 in consideration of such a moving distance C will be described.

From the state shown in FIG. 3, the roll shafts 32-1 and 32-
When the rotation of No. 2 starts, the encoder 34 outputs a rotation angle detection signal. On the other hand, the tongue shaft 12 moves in the direction away from the forging roll 30 together with the outer cylinder 13, and as shown in FIG. 4, the pressure forming by the dies 33-1 and 33-2 starts at the rotation angle θ1. At this time, since a 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 forming is completed at the rotation angle θ2 in the state shown in FIG. 5, the detection signal from the strain detector 35 falls sharply as shown in FIG. The arithmetic unit 37 detects the fall of the detection signal by passing the detection signal from the distortion detector 35 through a differentiating circuit or the like, and detects the rotation angle θ2 at that time based on the rotation angle detection signal from the encoder 34.

The calculating section 37 also calculates the moving distance D of the outer cylinder 13 (work 20) driven by the cam 40 and the link mechanism 42 from the rotation angle θ2 based on a predetermined formula. The moving distance D is obtained by measuring the correspondence between the rotation angle and the moving distance as shown in FIG. 8 in advance and storing it in a 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 moving distance D
Is added to the moving distance C detected by the gap sensor 16 and the set value A from the set value input unit 36 is subtracted to calculate the total length L of the work 20.

The arithmetic unit 37 outputs a signal indicating that the calculated total length L is within the allowable range for the total length input from the set value input unit 36, and outputs the signal if the calculated total length L is out of the allowable range. Is output in the process of transferring to the automatic forging press as a post-processing step.

[0021]

As described above, according to the present invention, the length of the work formed by the forging roll can be automatically measured during the forming process, so that the signal from the measuring device can be used. 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 as the next step within a certain value.
This has a great effect of contributing to the improvement of the quality of the molded product and the shortening of the molding process time when considering a system including the entire pretreatment process by the forging roll, the transport process, and the post-treatment process by the automatic forging press.

[Brief description of the drawings]

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

FIG. 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 starting forming.

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

FIG. 5 is a diagram showing a positional relationship between a forging roll and a work at the end of pressure forming.

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

FIG. 7 is a diagram showing an example of a detection signal from the distortion detector shown in FIG. 2;

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

[Explanation of symbols]

 DESCRIPTION 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

Continuation of the front page (56) References JP-A-4-55036 (JP, A) JP-A-4-55018 (JP, A) JP-A-5-123812 (JP, A) JP-A-5-172558 (JP) , A) (58) Fields investigated (Int. Cl. ⁶ , DB name) G01B 21/00-21/30 B21J 5/06

Claims (2)

(57) [Claims] An apparatus for measuring the length of a work (20) formed by a forging roll (30), comprising a 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, Calculation for calculating the forming length of the workpiece using the detection angles θ1 and θ2 of the angle detector (34) at the time of the rise and fall of the detection signal from the detector (35) at the start and end of pressurization. And a forming length measuring device for a forging roll. 2. A tong (1) for gripping a work (20).
(1) a tongue shaft (12), an outer cylinder (13) accommodating the tongue shaft and moving in synchronization with the rotation of the forging roll (30) together with the tongue shaft, and an axial direction with respect to the tongue shaft; The forging roll combined with a manipulator (10) including a tongue shaft relief mechanism (14) that allows only the tongue shaft to move relative to the outer cylinder when a stress equal to or more than a predetermined value is applied. Is a device for measuring the length of a workpiece formed by a roll shaft (32-1, 3-2).
A detector (35) attached to a frame (31-2) supporting the 2-2) and detecting the behavior of the roll shaft at the start and end of pressurization; An angle detector (34) for detecting, a movement amount detector (16) for detecting a movement amount C of the tongue shaft when the release mechanism is operated, and a pressurization end from the start of pressurization 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 for calculating 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 tongue shaft at the roll origin position measured in advance to calculate the total length of the work ( 37) a forging roll comprising: Forming length measuring device.