JP2013000772A - Riveting machine and method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a riveting machine greatly reducing a tact time without using a compressor and a hydraulic motor.SOLUTION: The riveting machine includes: a male screw 3 axially supported on a base 2 of a column for free rotation of upper and lower ends in position; a first servo motor 4 mounted on the base and disposed to reversibly drive the male screw; a guide means 6 supported on the base via a support member; a sleeve 7 disposed to be slide-guided vertically by the guide means; a spindle 8 axially supported on the sleeve for free rotation in position; a second servo motor 9 mounted on the sleeve and disposed to drive the spindle; a bracket 13 attached to the sleeve and disposed to hold a female screw 12 screwed into the male screw not to rotate; and a rivet head-molding tool 10 disposed on a lower end of the spindle.

Description

  The present invention relates to a riveting machine and a riveting method.

  The conventional riveting machine is held by the molding tool at the lower end of the spindle while lowering the spindle that is supported by the descending action of the cylinder supported by the column through the shaft axis of the piston axis together with the piston axis. The molding shaft is pressed against the work rivet of the workpiece, and the spindle is driven by a motor, and the rivet head is molded on the work rivet by turning the molding shaft (see, for example, Patent Documents 1 and 2). .

Japanese Patent Publication No.43-24834 Japanese Utility Model Publication No. 7-18449

  By the way, according to the riveting machines of Patent Documents 1 and 2, since processing is performed under preset conditions, an experience value and a test piece are required, and a failure of the machine is determined by detecting defective products. However, since the life management of machine parts is performed based on the usage time and the number of products produced, there were problems such as problems caused by outflow of defective products and replacement of non-life products.

  In addition, since data management was performed by converting control commands and output signals into analog data, the error was large and the sampling cycle was long.

  Furthermore, when there are a plurality of types of products, the machine ascending end is adjusted to the one with the longest stroke, so there is a product that moves a useless stroke, and the tact time cannot be shortened. That is, the user who has changed the rising end for each product for each product change needs to adjust the height after the change.

  In addition, only the spindle motor was driven by the inverter and feedback control to the pressure axis was performed. By using a servo motor, the accuracy and response speed can be further increased, enabling more optimal machining. Become.

  In addition, even with a device with a speed change mechanism, the contact position with the product is not accurately known, and the reaction speed of the hydraulic / pneumatic solenoid valve was also slow, so the speed switching position by the speed change mechanism also varied, affecting the tact time. , Contacted and affected the quality of the product.

  In addition, since the pneumatic machine required a compressor when using the machine, and the hydraulic machine required a hydraulic pump motor, the compressor and hydraulic pump that are the power source are operating even when the machine is in an idle state. there were.

  Therefore, the present invention is to provide a riveting machine and a riveting method that solve the above-mentioned problems.

  In order to solve the above-mentioned problems, the present invention is provided with a male screw that is supported on the base of the column so that the upper and lower ends rotate freely in a fixed position, and mounted on the base so as to reversibly drive the male screw. A first servo motor, guide means supported on the base via a support member, a sleeve provided to be slidably guided in the vertical direction by the guide means, and a bearing so that the sleeve can freely rotate at a fixed position. A spindle that is mounted on the sleeve to drive the spindle, and a female screw that is attached to the sleeve and screwed into the male screw is provided in a non-rotating state. The structure which consists of a bracket and the wharf molding tool provided in the lower end of the said spindle is employ | adopted.

  In addition, a configuration may be adopted in which the base can be adjusted up and down by an up-and-down adjusting means provided on the column side.

  Furthermore, a male screw that is supported on the base of the column so that the upper and lower ends rotate freely in a fixed position, a first servo motor that is mounted on the base and reversibly drives the male screw, A guide means supported via a support member, a sleeve provided so as to be slidably guided in a vertical direction by the guide means, a spindle that is supported by the sleeve so as to freely rotate at a fixed position, and mounted on the sleeve. A second servomotor provided to drive the spindle; a bracket provided to hold the female screw attached to the sleeve and screwed into the male screw; and provided at a lower end of the spindle. It consists of a wharf molding tool, drives the spindle as the second servo motor operates, and then drives the first servo motor While driving the male screw forward and driving the spindle together with the sleeve at high speed, when the molding shaft of the wharf molding tool comes into contact with the work rivet, the operation of the first servo motor is switched from high speed to low speed, A rivet method in which a rivet head is formed while the spindle is lowered at a low speed together with the sleeve, and the first servo motor is driven in reverse rotation after the rivet head is formed, and the sleeve is moved together with the spindle at a high speed operation. Is adopted.

  As described above, according to the riveting machine and riveting method of the present invention, the spindle having the molding tool is driven by the operation of the second servo motor, and the male screw is rotated forward and reverse by the high speed and low speed operation of the first servo motor. Drive and lower the molding tool side at a high speed, lower the rivet head at a low speed, and raise the rivet head at a high speed, so the tact time can be shortened and the productivity can be greatly improved. This eliminates the problem of noise caused by the operation of compressors and hydraulic pumps, noise caused by hydraulic pump drive noise, power consumption, and standby power.

  In addition to controlling the position, thrust, and speed by using a servo motor, it is possible to perform optimum processing according to the product characteristics, and the rising end and stroke can be set for each product. Adjustment is not required and machining can be performed in the shortest time.In the past, machine faults are determined by detecting defective products, but the life of machine parts is managed based on usage time and number of production. By checking the load factor and fluctuation due to each current value, trouble diagnosis (pre-failure diagnosis) can be performed by checking load factors and fluctuations due to current values for problems caused by the outflow of defective products and replacement of non-life products. In addition, it is possible to manage the life of items for which an allowable range can be provided in advance by collecting each data.

  Further, conventionally, even if only the spindle motor is driven by an inverter, feedback control to the pressure shaft cannot be performed and independent control is performed, so that it is not possible to determine whether optimum machining has been performed. 2 By controlling the feedback of the servo motor together with the male screw, it is possible to perform optimum processing while looking at the product characteristics.

  Furthermore, even with conventional devices with a speed change mechanism, the contact position with the product is not accurately known, and the response speed of the oil-air solenoid valve is also slow, so the speed switching position by the speed change mechanism also varies, affecting the tact time. The contact position can be accurately read by searching the contact point, and the fast-forward position can be moved to the specified position. Because the solenoid valve is not used, there is no need to consider the reaction speed, so tact time can be shortened, and there is little possibility of adversely affecting product quality by eliminating contact with parts during rapid traverse. became.

  Moreover, since the base is moved up and down by the lifting means, the adjustment corresponding to the thickness (height direction) of the workpiece and the length of the rivet can be easily performed.

It is a vertical side view which shows embodiment of this invention. It is a cross-sectional plan view same as the above.

Embodiments of the present invention will be described with reference to the accompanying drawings.
In the first embodiment, as shown in FIGS. 1 and 2, the base 2 of the column 1 is provided with a male screw (ball screw) 3 that is supported so that the upper and lower ends rotate freely. 3 is reversibly driven by a first servo motor 4 mounted on the base 2.

  A sleeve 7 that is slidably guided in a vertical direction by a guide means 6 supported on a base 2 via a support member 5 is provided with a spindle 8 that is supported by the upper and lower ends so as to penetrate freely and rotate freely.

  In the illustrated case, a cylindrical body is used as the guide means 6, and a sleeve 7 is fitted into the cylindrical body so as to slide in the vertical direction.

  Further, a second servo motor 9 mounted on the sleeve 7 is connected to the upper end of the spindle 8 to receive drive transmission, and a wharf forming tool 10 is provided on the lower end of the spindle 8.

  The wharf molding tool 10 has a molding shaft 11 that precesses as is well known.

  Further, the sleeve 7 is provided with a bracket 13 in which a female screw 12 screwed into the male screw 3 is held in a non-rotating state, and the sleeve 7 is moved up and down together with the bracket 13 as the male screw 3 is reversibly rotated. ing.

  In the figure, reference numeral 14 denotes a vertically long penetrating window provided in the guide means 6 so as not to hinder the elevation of the bracket 13.

Next, a riveting method using the riveting machine configured as described above will be described.
First, the inserted work B of the rivet A is placed on the cradle 15.

Next, the first servo motor 4 and the second servo motor 9 are operated to start activation.
As the first servo motor 4 is operated, the male screw 3 is driven to rotate forward at high speed, so that the sleeve 8 is fast-forwarded and lowered together with the support member 5 having the female screw 12 screwed into the male screw 3.

  When the tip of the molding shaft 11 of the wharf molding tool 10 that has been lowered together comes into contact with the rivet A or comes into contact with the rivet A, the operation of the first servo motor 4 is performed at a low speed so that the pressure thrust of the wharf molding becomes a pressing force. Can be switched.

  On the other hand, since the spindle 8 is driven by the operation of the second servo motor 9, the wharf of the rivet A is formed by the forming shaft 11 in the contact state.

  After the molding of the wharf, the forward / reverse operation of the first servo motor 4 is switched to the reverse operation, and the guide means 6 and the sleeve 7 are moved up at a high speed together with the base 2.

  Since the second servo motor 9 is used for driving the spindle 8 side, the second servo motor 9 can be controlled by an inverter or servo and interlocked with the male screw 3 side to achieve optimum machining, and the product. Management is possible at the contact position (processing start position).

  And by controlling the servo motor and inverter, it is possible to save energy by using the necessary energy only when necessary.

  In the second embodiment of the present invention, the base 2 of the first embodiment can be adjusted up and down (height position) by the up-and-down adjustment means C.

  In the illustrated case, the elevation adjusting means C is configured by a guide means 21 for the base 2 with respect to the column 1 (this guide means 21 is constituted by a dovetail groove and a protruding slidably engaged with the dovetail groove in the figure. And the like, and a female screw 23 supported by the base 2 is screwed into a male screw 22 supported so that the upper and lower ends of the column 1 can freely rotate. The base 2 can be moved up and down as the handle 24 is rotated.

  Then, the caulking position corresponding to the workpiece thickness (height) and the rivet length (axial length) can be adjusted.

DESCRIPTION OF SYMBOLS 1 Column 2 Base 3 Male screw 4 1st servomotor 5 Support member 6 Guide means 7 Sleeve 8 Spindle 9 2nd servomotor 10 Wharf molding tool 11 Molding shaft 12 Female screw 13 Bracket 14 Passing window C Lifting adjustment means 21 Guide means 22 Male screw 23 Female screw 24 Handle

Claims (3)

  A male screw that is supported on the base of the column so that the upper and lower ends rotate freely at fixed positions, a first servo motor that is mounted on the base and reversibly drives the male screw, and a support member on the base The guide means supported via the guide, the sleeve provided to be slidably guided in the vertical direction by the guide means, the spindle that is supported by the sleeve so as to freely rotate at a fixed position, and the spindle mounted on the sleeve. A second servo motor provided to drive the motor, a bracket provided to hold the female screw attached to the sleeve and screwed into the male screw in a non-rotating state, and a wharf provided at the lower end of the spindle A riveting machine consisting of molding tools.   2. The riveting machine according to claim 1, wherein the base can be adjusted up and down by a vertical adjustment means provided on the column side.   A male screw that is supported on the base of the column so that the upper and lower ends rotate freely at fixed positions, a first servo motor that is mounted on the base and reversibly drives the male screw, and a support member on the base The guide means supported via the guide, the sleeve provided to be slidably guided in the vertical direction by the guide means, the spindle that is supported by the sleeve so as to freely rotate at a fixed position, and the spindle mounted on the sleeve. A second servo motor provided to drive the motor, a bracket provided to hold the female screw attached to the sleeve and screwed into the male screw in a non-rotating state, and a wharf provided at the lower end of the spindle It consists of a molding tool, drives the spindle as the second servo motor operates, and then drives the first servo motor at high speed. While the male screw is driven forward and the spindle is moved down at high speed together with the sleeve, when the molding shaft of the wharf molding tool comes into contact with the work rivet, the operation of the first servo motor is switched from high speed to low speed, and the sleeve The rivet method is characterized in that the rivet head is molded while the spindle is lowered at a low speed, and the first servo motor is driven in reverse rotation after the rivet head is molded, and the sleeve and the spindle are advanced at a high speed by high speed operation.

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