JP3136866U - Spinning processing equipment - Google Patents

Abstract

In a spinning processing apparatus that drives a roller tool with a linear motor, it is possible to perform force control with sufficiently high responsiveness while suppressing the cost, size, weight and power consumption of the apparatus, To provide a spinning device capable of forming a cross-sectional shape in a short time.
A feed displacement of a roller tool 5 in a direction parallel to a rotation axis of a mold 3 is controlled by a servo motor 8 and a ball screw 9, and a pressing force applied to the workpiece 1 by the roller tool 5 is controlled by a linear motor. Therefore, the irregular cross-sectional shape can be formed in a short time. In addition, the manufacturing cost, size, weight, and power consumption of the device can be kept low.
[Selection] Figure 1

Description

  The present invention relates to a spinning processing apparatus.

  The spinning device is a device that performs a forming process by fixing a workpiece of a plate material or a tube material to a forming die, rotating the workpiece together with the forming die, and pressing the work against the forming die with a roller tool. In general, a spinning processing apparatus includes a main shaft for rotating a mold and a workpiece, and a plurality of linear motion mechanisms that cross each other for driving a roller tool to press the workpiece against the mold.

  In conventional spinning processing, only products with a circular cross-sectional shape perpendicular to the rotation axis could be processed, but the cross-sectional shape orthogonal to the rotation axis was not a circular shape such as a polygon or an ellipse. If the product can be processed, the use of spinning processing can be expanded by diversifying the moldable products. For example, there has been proposed a spinning method for forming such an irregular cross-sectional shape by controlling the pressing force with a roller tool (Japanese Patent Application No. 2005-516096).

In addition, when processing products with irregular cross-sections, the rotational speed of the mold and workpiece should be lower than usual so that the expansion and contraction response of the hydraulic cylinder and ball screw catch up with changes in the radial length of the mold. It was necessary to suppress, and this was a cause of a reduction in processing speed.
Therefore, in order to improve the responsiveness of the force control of the roller tool, a spinning device using a linear motor as a linear motion mechanism for driving the roller tool has also been proposed (Japanese Patent Laid-Open No. 2005-211969).

Here, the linear motor generates a thrust according to the winding current, and can directly apply the generated thrust to the drive target without using a transmission mechanism such as a ball screw. Further, the frictional resistance is only due to the linear guide, and the loss of thrust due to friction is small. Furthermore, it can operate at a much higher speed and higher acceleration / deceleration than a hydraulic cylinder or ball screw.
Therefore, if the linear motor is used, it is possible to configure the pressing force control of the roller tool with extremely excellent responsiveness. When processing a product with an irregular cross-sectional shape, the roller tool can pressurize the workpiece following the mold even if the radial length of the mold changes at high speed.
Japanese Patent Application No. 2005-516096 Japanese Patent Laid-Open No. 2005-211969

  However, as shown in Patent Document 1, as a linear motion mechanism for driving a roller tool, in a conventional spinning machine using a hydraulic cylinder or a ball screw rotated by a servomotor, a spinning machine between a cylinder and a piston is used. Highly responsive because of sliding friction, fluid resistance in hydraulic oil piping system, servo valve response, ball screw friction and backlash, elasticity of joint between motor and ball screw, etc. It was difficult to configure force control.

In addition, in the case of using the linear motor shown in Patent Document 2, in order to process a steel plate / stainless steel plate or a thick workpiece, which has a generally small thrust that can be continuously generated and is difficult to deform, a very large linear A motor and servo driver are required. In addition, compared with a hydraulic cylinder or ball screw having the same thrust, there are disadvantages that the size and weight of the device and the power consumption increase, and that the cost of the device itself is high.
The object of the present invention is to solve the above-mentioned problems in the spinning processing apparatus in which the roller tool is driven by these linear motors, and the cost, size, weight, and power consumption of the apparatus are kept low while being sufficiently high. It is an object of the present invention to provide a spinning apparatus capable of performing force control with responsiveness and capable of forming an irregular cross-sectional shape in a short time.

  In order to solve the above problems, the present invention provides a first linear motion mechanism driven by a ball screw in a direction parallel to the rotational axis of the mold, and is mounted on the first linear motion mechanism, There is provided a spinning processing apparatus comprising a second linear motion mechanism driven by a linear motor in a direction orthogonal to each other and a roller tool attached to the second linear motion mechanism.

  Further, the present invention controls the feed displacement of the roller tool in the direction parallel to the rotation axis of the mold with the ball screw, and controls the pressing force applied to the workpiece by the roller tool with the linear motor, The above spinning apparatus is characterized in that an irregular cross-sectional shape can be formed.

  The present invention also provides the spinning device as described above, wherein the linear motor is a suction-offset type linear motor with a core.

  Further, the present invention is such that a deformed cross-sectional shape can be formed by driving the forming die with a servo motor capable of controlling the rotation angle and controlling the rotation angle of the forming die and the displacement of the roller tool in synchronization. The spinning apparatus described above is provided.

According to the present invention configured as described above, the following effects are produced.
In the present invention, a first linear motion mechanism driven by a ball screw in a direction parallel to the rotational axis of the mold, and a linear motor mounted in the first linear motion mechanism and orthogonal to the rotational axis. Since it has a second linear motion mechanism to be driven and a roller tool attached to the second linear motion mechanism, it uses a ball screw with a large thrust at a lower price than a linear motor. Cost, size, weight, and power consumption can be kept low.

  Further, in the present invention, in the direction orthogonal to the rotation axis of the mold, since the linear motor is used for driving, it is possible to control the pressing force of the roller tool having a sufficiently high response. Therefore, when processing a product having an irregular cross-sectional shape, the roller tool can pressurize the workpiece following the mold even if the radial length of the mold changes at high speed.

  Further, in the present invention, by using a suction force canceling type linear motor with a core, a large thrust can be generated, while the friction of the linear guide is reduced, and the pressing force of the roller tool can be controlled more efficiently and accurately.

  Also, in the present invention, by controlling the rotation angle of the mold and the displacement of the roller tool in synchronization, the radial displacement is controlled by a high-speed, high acceleration / deceleration linear motor when forming a deformed cross-sectional shape. Therefore, molding in a short time is possible.

  The best mode for carrying out a spinning apparatus according to the present invention will be described below with reference to the drawings.

  FIG. 1 shows an embodiment of the spinning device of the present invention. The workpiece 1 is centered on the molding die 3 by the core push rod 2 and rotated together with the molding die 3 by the spindle motor 4. The roller tool 5 is configured to advance or retract in the radial direction of the mold 3 by a linear motion mechanism 7 driven by a linear motor 6 including a stator 6a and a movable element 6b. The linear motor 6 includes a displacement sensor (not shown) such as a linear scale that detects the linear displacement x of the linear motion mechanism 7.

  The linear motion mechanism 7 is mounted on a linear motion mechanism 10 driven by a rotary servo motor 8 and a ball screw 9, and moves forward or backward in a direction parallel to the rotation axis of the mold 3. The servo motor 8 includes an angle sensor (not shown) such as an encoder that detects a rotation angle, and can detect the linear displacement z of the linear motion mechanism 10.

  In the spinning processing apparatus having such a configuration, the workpiece 1 is pressed against the forming die 3 by the roller tool 5, and the workpiece 1 is finally processed from the flat plate 1a which is the initial shape into the shape 1b along the forming die 3. FIG. 2 shows a configuration for controlling the spinning device of the present invention and an outline of the control operation during molding. The linear displacements x and z of the linear motion mechanisms 7 and 10 are input to the machining control device 11, and the machining control device 11 calculates the thrust to be generated by the linear motor 6 and the torque to be generated by the servo motor 8, and the servo amplifier. The configuration is such that current is supplied at 12 and 13 to control the linear motor 6 and the servo motor 8.

  The processing control device 11 may be a dedicated machine or may use a computer. The configuration and function of the machining control device 11 will be described below. For the direction parallel to the rotation axis of the mold 3, the deviation between the target displacement zd of the linear motion mechanism 10 that changes according to the feed speed of the roller tool 5 specified in advance and the actual displacement z measured by the encoder is extracted. Based on the position control law, the torque to be generated by the servo motor 8 for position control in the feed direction is calculated. When this torque is given to the servo amplifier 12 as a torque command value, the servo amplifier 12 outputs a current corresponding to the command value to the servo motor 8.

  Regarding the direction orthogonal to the rotation axis of the mold 3, the thrust to be generated by the linear motor 6 is calculated for force control in the pressing direction from the target value Fd of the pressing force of the roller tool 5 specified in advance. When this thrust is given to the servo amplifier 13 as a thrust command value, the servo amplifier 13 outputs a current corresponding to the command value to the linear motor 6. In the calculation of the thrust command value, if the inertial force and frictional force acting on the linear motion mechanism 7 are calculated from the change of the displacement x of the linear motion mechanism 7 and are compensated, the pressing force of the roller tool 5 can be more accurately calculated. Can be controlled.

  As described above, the roller tool 5 moves in accordance with the target displacement zd in the feed direction parallel to the rotation axis of the mold 3 and moves the workpiece 1 with an appropriate target pressing force Fd in the pressing direction orthogonal to the rotation axis of the mold 3. Press against the mold 3 and perform spinning. When the molding die 3 has an irregular cross-sectional shape such as a polygon or an ellipse in a cross section orthogonal to the rotation axis, the roller tool 5 follows the shape of the molding die 3 and the linear motion mechanism 7 reciprocates back and forth. Can be formed into the same cross-sectional shape as the mold 3. The linear motion mechanism 7 reciprocates at a rapid cycle due to a change in the radial direction length accompanying the rotation of the mold 3, but since the linear motor 6 gives a thrust, the response is sufficiently high, and the roller with an appropriate pressing force. The workpiece 1 can be pressurized with the tool 5. On the other hand, since the linear motion mechanism 10 is a low-speed feed operation with a small speed fluctuation, there is no shortage of response even when driven by the servo motor 8 and the ball screw 9.

  When processing a steel plate / stainless steel plate or a thick workpiece, the linear motor 6 requires a very large thrust. Therefore, it is desirable to use a mover 6b having a core (iron core). However, in that case, a strong attractive force A acts between the permanent magnet of the stator 6a and the core of the mover 6b, which causes an increase in the frictional force in the linear guide of the linear motion mechanism 7 (FIG. 3a). Therefore, if a suction force canceling linear motor in which two sets of stators 6a, 6a ′ and movers 6b, 6b ′ are arranged symmetrically is used, the suction forces B and B ′ cancel each other, so that a large thrust is generated. While it can be generated, the frictional force of the linear motion mechanism 7 is significantly reduced, and the pressing force of the roller tool 5 can be controlled more efficiently and accurately (FIG. 3b).

  FIG. 4 shows a schematic diagram of a method for forming an irregular cross-sectional shape by another method. In this case, a servo motor is used as the spindle motor 4 so that the rotation angle θ of the mold 3 and the workpiece 1 can be controlled. The processing roller 5 is advanced or retracted in the radial direction by the linear motor 6 in synchronization with the rotation angle θ of the mold 3 and the workpiece 1, and the contact point between the processing roller 5 and the workpiece 1 is a trajectory P having a target cross-sectional shape. Control to touch. The shape of the track P is changed smoothly, and finally the workpiece 1 is molded so as to be in close contact with the surface of the molding die 3 having an irregular cross-sectional shape. In this case, the linear motor 6 controls the displacement x instead of the thrust control. However, since the high-speed and high acceleration / deceleration operations are possible, the linear motor 6 can follow the fast reciprocating motion in the radial direction, and can be performed in a short time. Molding is possible.

  The best mode for carrying out the spinning processing apparatus according to the present invention has been described based on the embodiments. However, the present invention is not limited to such embodiments, and the utility model registration claims are described. Needless to say, there are various embodiments within the scope of technical matters.

  Since the spinning processing apparatus according to the present invention has the above-described configuration, as a method for forming a metal product, household containers, decorative crafts, lighting equipment, communication (such as parabolic antennas), boilers, It can be widely applied to the manufacture of parts and products such as tanks, nozzles, engine parts and tire wheels.

FIG. 1 is an explanatory diagram of a spinning apparatus showing an embodiment of the present invention. FIG. 2 is an explanatory diagram illustrating a configuration for controlling the spinning processing apparatus and an outline of a control operation during molding. FIGS. 3A and 3B are explanatory views showing the effect of the suction force canceling linear motor in the spinning processing apparatus. FIG. 4 is an explanatory view showing a forming method for forming an irregular cross-sectional shape by controlling the rotation angle of the forming die and the displacement of the roller tool in synchronization.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Workpiece 2 Core push rod 3 Forming die 4 Spindle motor 5 Roller tool 6 Linear motor 7 Linear motion mechanism 8 Servo motor 9 Ball screw 10 Linear motion mechanism 11 Process control device 12, 13 Servo amplifier

Claims (4)

  A first linear motion mechanism driven by a ball screw in a direction parallel to the rotational axis of the mold, and a first linear motion mechanism mounted on the first linear motion mechanism and driven by a linear motor in a direction perpendicular to the rotational axis. A spinning processing apparatus comprising: a second linear motion mechanism; and a roller tool attached to the second linear motion mechanism.   By controlling the feed displacement of the roller tool in the direction parallel to the rotation axis of the mold with the ball screw, and controlling the pressing force applied by the roller tool to the workpiece with the linear motor, a deformed cross-sectional shape is formed. The spinning apparatus according to claim 1, which is possible.   The spinning processing apparatus according to claim 1, wherein the linear motor is a linear motor with a suction force canceling type core.   The deformed cross-sectional shape can be formed by driving the forming die with a servo motor capable of controlling the rotation angle and controlling the rotation angle of the forming die and the displacement of the roller tool in synchronization. Item 4. A spinning processing apparatus according to Item 1.

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