JP2003181555A - Spinning method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable spinning for a product whose cross section orthogonal to a rotary shaft has a shape of non-circle such as polygon or ellipse. <P>SOLUTION: A forming mold 2 and a work 1 are rotated by using a motor 3 equipped with an angle detector 3a. Based on product shape data preliminarily stored, a working roller 4 is made to advance or retreat to the forming face 2' of the forming mold 2 in accordance with a feeding amount of the working roller in the axial direction of the forming mold 2 and with a rotating angle of the forming mold 2, and the work 1 is formed along the cross section shape of the forming mold 2 with the working roller 4. Thus, even a product having a non-circular cross section can be formed. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a spinning method and a spinning apparatus.

[0002]

2. Description of the Related Art Spinning is a method in which a work of a plate material is centered on a forming die, rotated together with the forming die, and pressed by a processing roller to perform the forming work. As a molding method for products made from metal plates, it is used to manufacture parts and products for household containers, decorative crafts, lighting equipment, communications (parabolic antennas, etc.), boilers, tanks, nozzles, engine parts, tire wheels, etc. Widely used.

[0003]

In the spinning process, since the forming die and the work are processed while rotating, generally, for a certain feed amount in a direction parallel to the rotation axis of the processing roller (referred to as the rotation axis direction). The position of the processing roller with respect to the molding surface of the molding die (distance to the molding surface) is kept constant. Therefore, conventionally, only a circular product having a cross-sectional shape orthogonal to the rotation axis around the rotation axis could be processed.

Another method has been invented in which a machining roller is pressed against a work with a constant force by an actuator such as a ball screw or a hydraulic cylinder so that the machining roller follows the forming die and a product having a cross section other than a circle is machined. But,
Actuator response to changes in the radial length of the mold,
For example, it is necessary to keep the rotational speed of the forming die and the work lower than usual so that the response of expansion and contraction of the hydraulic cylinder can catch up, which causes a reduction in the processing speed.

An object of the present invention is to solve the above-mentioned problems in the conventional spinning process, and to reduce the processing speed of a product whose cross-section orthogonal to the rotation axis is not circular such as polygonal or elliptical. It is an object to realize a method of spinning without doing so.

[0006]

In order to solve the above problems, the present invention provides a motor having an angle detector in a spinning method in which a work of a plate material is pressed against a rotating forming die by a processing roller to perform a forming process. By rotating the forming die and the work, based on the shape data of the product stored in advance, in accordance with the feed amount of the forming roller in the rotation axis direction of the forming die and the rotation angle of the forming die, the processing roller Characterized in that a product having a non-circular cross-sectional shape can be molded by advancing or retreating with respect to the molding surface of the molding die and molding the work along the cross-sectional shape of the molding die with a processing roller. To provide a spinning processing method.

It is characterized in that the rotational speed of the motor for rotating the forming die and the work is controlled according to the shape of the point where the working roller is in contact with the work, and the working is performed at an appropriate speed.

The pressure applied to the work by the processing roller is corrected by a feedback signal from a force sensor mounted on the processing roller.

Before forming, the forming roller is pressed against the forming die to which the work is not mounted, the forming roller is scanned in the direction of the rotation axis while rotating the forming die, the shape data of the forming die is acquired, and the forming die is used for forming processing. It is characterized in that the processing roller locus is calculated.

In order to solve the above-mentioned problems, the present invention is a process in which a motor having an angle detector, a molding die rotated by the motor, and a plate material rotated by the motor are pressed against a work to perform the molding process. In a spinning processing apparatus including a roller, the processing roller is based on shape data of a product stored in advance, according to the processing roller feed amount in the rotation axis direction of the molding die and the rotation angle of the molding die,
A spinning process characterized in that a product whose cross-sectional shape is not circular can be formed by advancing or retreating with respect to the forming surface of the forming die and forming the work along the sectional shape of the forming die. Provide a device.

The rotation speed of the motor is controlled according to the shape of the point where the processing roller is in contact with the work.

The actuator is controlled by a feedback signal from a force sensor mounted on the processing roller to correct the pressure applied to the work.

The shape data of the product is obtained by pressing the processing roller against the molding die on which the work is not mounted and scanning the processing roller in the rotation axis direction while rotating the molding die. The processing roller locus at the time of molding is calculated based on the shape data of 1.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below based on examples with reference to the drawings. FIG. 1 is a schematic view of a spinning method of the present invention and an apparatus for performing this method. The work 1 is centered on the forming die 2 by a core push rod 2a and rotates together with the forming die 2 driven by a motor 3 having an angle detector 3a such as an encoder / resolver. The mold 2 has a rotating shaft 8 driven by a motor 3.
(Hereinafter, it is referred to as the "rotating shaft" of the molding die). The motor 3 is configured so that its rotation speed is servo-controlled.

The processing roller 4 is installed on the translation table 5 in the pressing direction. The pressing direction translation table 5 is driven by an actuator such as a ball screw or a hydraulic cylinder (not shown) to move the processing roller 4 to the molding surface of the molding die 2 (accurately, the molding die 2 is centered. The axis of the rotating shaft 8 to be attached has a certain angle, and is moved forward or backward with respect to the “pressing direction” which is the direction A that approaches or leaves the molding surface of the molding die 2. The axial translation table 6 is arranged in a direction parallel to the rotary shaft 8 (hereinafter,
It can be moved in the direction B).

It should be noted that if a structure is adopted in which the position of the pressing direction translation table 5 in the rotational direction can be adjusted in a plane parallel to the surface of the axial translation table 6 with respect to the axial translation table 6. The angle of the linear movement direction of the pressing direction linear movement table 5 (direction of arrow A in FIG. 1) with respect to the molding surface 2 ′ of the molding die 2 can be adjusted. As a result, the molding die 2 of various shapes
On the other hand, it can be set in advance so that it can move linearly in a direction perpendicular to the molding surface 2 '.

The pressing direction translation table 5 and the axial translation table 6 are each provided with a displacement sensor such as an encoder / potentiometer for detecting the feed amount. Further, the processing roller 4 is provided with a force sensor 7 such as a load cell and can detect the pressing force applied to the work 1. The work 1 is pressed against the forming die 2 by the processing roller 4, and the work 1 is finally processed from the flat plate 1a having the initial shape to the shape 1b along the forming die 2.

When the cross-sectional shape of the molding die 2 orthogonal to the rotation axis 8 is not a circle centered on the rotation axis, the moving stroke of the pressing direction translation table 5 in the pressing direction varies depending on the rotation angle. Therefore, before starting the molding process, the locus of the processing roller 4 being processed is calculated based on the CAD data of the product or the shape measurement result of the molding die 2.

FIG. 2 shows an example in which the shape of the product is a truncated pyramid (pyramidal shape). In FIG. 2, from the variation of the radial length in the cross section 9 of the pyramidal molding die 2, the processing roller 4 is changed with respect to the corresponding feed amount in the rotation axis direction of the processing roller 4.
The feed amount (feed amount in the pressing direction) 11 of the processing roller 4 with respect to the product shape to the molding surface 2 ′ of the mold 2 is calculated.

Further, with respect to the feed amount in the rotation axis direction corresponding to another cross section 10 of the pyramidal forming die 2, the feed amount (feed amount in the pressing direction) 12 of the forming die 2 with respect to the forming surface 2'is. It is calculated. In this way, the trajectory data of the working roller 4 is calculated and stored as a table of the feed amount in the pressing direction of the working roller 4 with the feed amount in the rotation axis direction and the rotation angle of the molding die 2 as arguments. Further, in the drawing process, it is desirable that the work 1 is gradually deformed from the flat plate having the initial shape and finally brought into close contact with the forming die 2.

Therefore, the target shape of the work 1 at each stage in the course from the start of processing to the final finishing is obtained by interpolation or the like, and a table of such processing roller locus data is prepared for each.

FIG. 3 shows an outline of control during molding. The rotation axis controller 14 acquires a rotation angle signal from the angle detector 3a attached to the motor 3 that rotates the molding die 2, and servo-controls the rotation speed of the motor 3 based on the deviation from the target rotation angle. Rotary axis direction feed controller 1
Reference numeral 5 acquires a displacement sensor signal from the axial translation table 6, and servo-controls the movement of the rotational translation table 6 based on the deviation from the target feed amount.

Based on the feed amount in the direction parallel to the rotary shaft 8 and the rotation angle signal, the feed amount in the pressing direction of the processing roller 4 is read out by a table lookup of the machining roller locus data 16, and the feed amount in the pressing direction is set as a target value. Send to controller 17. The pressing direction feed controller D obtains a displacement sensor signal from the pressing direction linear motion table 5 and drives the pressing direction linear motion table 5 based on the deviation from the target feed amount to move the processing roller 4 in the direction of arrow A in FIG. Control the feed amount.

As described above, the processing roller 4 is controlled in accordance with the target shape of the work 1 and is finally formed into a shape that comes into close contact with the forming die 2. Here, the locus of the processing roller 4 is calculated and stored in advance before the forming process, but during the forming process, the feed amount in the direction of arrow A in FIG. 1 is calculated from the rotation angle and the feed amount in the rotation axis direction based on the product shape data. It is also possible to calculate.

When the product shape has a taper or a constriction,
The position in the feed direction at the point where the processing roller contacts the work changes. When the rotation speed of the rotating shaft is constant, the relative speed of the processing roller to the work surface increases as the rotation radius increases, and the speed varies depending on the location. If the cross-sectional shape orthogonal to the rotation axis is not circular, the processing roller speed changes even on the same cross-sectional circumference. Such uneven processing roller speed may cause uneven processing.

Further, when the product shape has an angle with a small radius of curvature, when the processing roller passes through the corner, the feed speed in the feed direction changes rapidly as indicated by point 13 on the graph of FIG. . Such a change is not preferable for control because the response of the axial translation table 6 in the feed direction cannot catch up.

Therefore, the larger the radius of rotation of the point where the processing roller 4 is in contact with the work 1, the smaller the rotation speed of the work 1, and the smaller the rotation speed of the work 1 near the point where the radius of curvature of the work 1 is small. Processing roller 4
Controls the rotational speed of the molding die 2 and the motor 3 for rotating the work 1 according to the shape of the point where the work 1 touches the work 1,
Process at an appropriate speed.

When the work 1 approaches the final shape and presses the working roller 4 in a state of being in close contact with the molding die 2, if there is an error in the working roller locus data 16, an excessive force is applied to the working roller 4 and the work 1. Or, conversely, the processing roller 4 and the work 1 may float from the forming die 2. Manufacturing error of mold 2 for CAD data, mold 2
There is a possibility that such an error may occur due to a measurement error, a thermal expansion of the molding die 2 due to processing, a delay in response in control, and the like.

Therefore, as shown in FIG. 1, a force sensor 7 such as a load cell is attached to the processing roller 4 to detect the pressing force. Pushing direction feed controller 17 for the detected force signal
And the pressing direction translation table 5 is driven to correct the pressing force.

Further, by using this force sensor 7, the processing roller locus 16 can be directly obtained from the molding die 2 before the molding processing. Feedback control is performed by the force signal detected by the force sensor 7 of FIG. 1 so that a constant pressure is applied to the processing roller 4, and the pressing direction translation table 5 is driven. The processing roller 4 is brought into close contact with the molding die 2 without mounting the work 2, and the molding roller 2 is scanned by the axial translation table 6 in the rotational axis direction while the molding die 2 is rotated at a low speed by the motor 3.

At this time, the feed amount in the rotary axis direction by the rotary axis direction linear motion table 6 and the feed amount in the pressing direction of the pressing direction linear motion table 5 corresponding to the rotation angle of the motor 3 are stored. If this data is corrected in consideration of the product thickness, the processing roller locus data 16 at the final finishing stage can be obtained.

Further, the flat work 1a before processing is attached to the molding die 2, and the processing roller 4 is pressed with a pressing force such that the work 1a is not deformed.
The feed amount in the rotation axis direction and the feed amount in the pressing direction of the pressing direction translation table 5 corresponding to the rotation angle of the motor 3 are stored. By interpolating the machining roller trajectory data at this time and the machining roller trajectory data in the final finishing stage,
The processing roller locus data in the middle of processing can be easily calculated.

Although the spinning method according to the present invention has been described based on the embodiments, the present invention is not limited to such embodiments, and various modifications can be made within the scope of the technical matters described in the claims. It goes without saying that there are various embodiments.

[0034]

According to the present invention having the above configuration, the following effects are produced. (1) Spinning can be performed on products whose cross-sectional shape orthogonal to the rotation axis is not circular such as polygonal or elliptical. Since the processing roller moves forward / backward according to the cross-sectional shape of the forming die, no excessive force is applied to the processing roller, and it is not necessary to reduce the rotational speed of the forming die and the work more than necessary.

(2) The relative speed of the processing roller with respect to the work becomes uniform, and the corner portion having a small radius of curvature can be accurately processed.

(3) Even if there is some error in the trajectory data of the processing roller, the processing roller presses the work against the forming die with an appropriate pressing force to perform uniform processing.

(4) The locus data of the processing roller can be obtained directly from the molding die by a simple method. Since measurement is performed in almost the same state as processing, there is no need to perform origin alignment or data correction based on the processing roller shape.

[Brief description of drawings]

FIG. 1 shows a schematic view of an apparatus for performing a spinning method according to the present invention.

FIG. 2 is a diagram showing the relationship between the cross-sectional shape of the product of the present invention and the feed amount in the pressing direction.

FIG. 3 is a diagram showing an outline of control during molding processing of the present invention.

[Explanation of symbols]

1 work 1a Work initial shape 1b Work final shape 2 Mold 2'molded surface 2a Tail rod 3 motor 3a Angle detector 4 processing rollers 5 Pressing direction translation table 6 Axial linear motion table 8 rotation axes 7 force sensor 9,10 Mold section 11, 12 Feed amount of processing roller in pressing direction 13 Feed amount at the corner of the mold 14 Rotation axis controller 15 Rotary axis feed controller 16 Processing roller locus data 17 Push direction feed controller

Claims (8)

[Claims] 1. A spinning method in which a plate-shaped work is pressed against a rotating forming die by a processing roller to perform forming, wherein the forming die and the work are rotated by using a motor equipped with an angle detector, and stored in advance. Based on the shape data of the product, according to the processing roller feed amount in the rotation axis direction of the molding die and the rotation angle of the molding die, the processing roller is moved forward or backward with respect to the molding surface of the molding die, A spinning processing method characterized in that a product having a non-circular cross section can be formed by forming the work with a processing roller along the cross section of a forming die. 2. The machining speed is controlled at an appropriate speed by controlling the rotational speed of a motor for rotating the forming die and the work according to the shape of the point where the processing roller is in contact with the work. The described spinning method. 3. The spinning processing method according to claim 1, wherein the pressure applied to the work by the processing roller is corrected by a feedback signal from a force sensor mounted on the processing roller. 4. A forming roller is pressed against a forming die on which a work is not mounted before forming, and the forming roller is scanned in the direction of the rotation axis while rotating the forming die, and the shape data of the forming die is acquired and forming is performed based on the shape data. The spinning processing method according to claim 1, 2 or 3, wherein a processing roller locus at the time is calculated. 5. A spinning processing apparatus comprising a motor having an angle detector, a molding die rotated by the motor, and a processing roller for pressing a plate material rotated by the motor against a work to perform the molding process. The processing roller is moved forward with respect to the molding surface of the molding die based on the shape data of the product stored in advance, according to the machining roller feed amount in the rotation axis direction of the molding die and the rotation angle of the molding die. Alternatively, the spinning processing apparatus is characterized in that a product having a non-circular sectional shape can be molded by retreating and molding the work along the sectional shape of the molding die. 6. The spinning processing apparatus according to claim 5, wherein the motor has a rotation speed controlled according to a shape of a point where the processing roller is in contact with the work. 7. The spinning processing apparatus according to claim 5, wherein the actuator is controlled by a feedback signal from a force sensor mounted on the processing roller to correct the pressure applied to the work. . 8. The shape data of the product is obtained by pressing a processing roller against a molding die on which the work is not mounted and scanning the processing roller in a rotation axis direction while rotating the molding die, The spinning processing apparatus according to claim 5, 6 or 8, wherein a processing roller locus at the time of molding is calculated based on the shape data of the product.