JP4611685B2 - Tightening device, vise equipped with this tightening device, and molding machine equipped with this tightening device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a secondary tightening device capable of fixing a movable body movable by rotating a driving shaft screw-fitting the movable body by a driving means and tightening additionally without providing a driving means exclusive for secondary tightening and to provide a vice provided with this secondary tightening device and a forming machine provided with this secondary tightening device. <P>SOLUTION: This secondary tightening device is composed of a first clutch provided between an output shaft of the driving means and a driving shaft to disconnect input to the driving shaft of output of the driving means, a second clutch provided on a driving shaft side of the first clutch, and a flywheel provided between the first clutch and the second clutch. The second clutch is disengaged after positioning the movable body at a predetermined fixing position to rotate the flywheel at predetermined rotation speed by the driving means, and then the first clutch is disengaged and the second clutch is engaged to rotate the driving shaft by the flywheel for secondary tightening. <P>COPYRIGHT: (C)2006,JPO&amp;NCIPI

Description

  The present invention relates to a tightening device used for a fixing operation requiring tightening, a vise equipped with the tightening device, and a molding machine equipped with the tightening device.

  2. Description of the Related Art Conventionally, in a device that clamps and fixes a workpiece such as a vise, a fixed body and a movable body that approaches and separates from the fixed body are provided, and the workpiece is sandwiched and fixed between the fixed body and the movable body. In addition, in a mold in a molding machine such as an injection molding machine, one of the molds is a fixed body, while the other is a movable body that approaches and separates from the fixed body, and the movable body is brought into contact with the fixed body. The required molding process is possible by contacting them.

  Such a movable body is screwed into a male screw-shaped drive shaft, and is rotated forward and backward along the drive shaft by rotating the drive shaft using a drive device such as a servo motor.

  Then, the movable body is positioned at a required fixed position, and then the movable body is further tightened by rotating the drive shaft in accordance with further driving of the driving device or driving of the driving device for tightening. It is firmly fixed.

In particular, when the movable body is moved back and forth along the drive shaft, the drive shaft is rotated at a high speed to move the movable body at a high speed, whereas when the movable body is tightened, the drive shaft is rotated with a large torque. In addition, it is desirable to use a drive device that can output high rotation and high torque for the drive device that rotates the drive shaft. However, a drive device having characteristics of high rotation and high torque has basically contradictory characteristics. Since it is expensive due to the combined drive device, normally, two drive devices are used: a drive device capable of high rotational output and a drive device capable of high torque output (for example, Patent Documents). 1).
Japanese Patent Application Laid-Open No. 06-91711

  However, when two drive devices are provided on one drive shaft, there is a problem that a vise or a molding machine is enlarged due to the need for a space for arranging two drive devices, and the vise is increased. Or there existed a problem that reduction of the manufacturing cost of a molding machine was difficult.

  The present inventor has conducted research and development to achieve a desired tightening without using an excessive load on the drive device, and has achieved the present invention.

  Therefore, in the tightening device of the present invention, in the tightening device that performs the tightening by rotating the shaft screwed to the movable body by the driving unit, the driving unit includes the output shaft of the driving unit and the shaft. A first clutch for intermittently inputting / outputting the output to the shaft is provided, a second clutch is provided on the shaft side of the first clutch, and a flywheel is provided between the first clutch and the second clutch. . Then, after the movable body is positioned at a predetermined position by rotating the shaft by driving means, the second clutch is disengaged and the flywheel is rotated by the driving means at a predetermined rotational speed, and then the first clutch is moved. The second clutch is connected and the shaft is rotated by a flywheel and tightening is performed with the disconnected state.

  The vice of the present invention is a vise that moves and moves the movable body by rotating the drive shaft screwed to the movable body by the driving means, and further rotates the drive shaft to move the workpiece. In a vise equipped with a tightening device for tightening a movable body sandwiched and fixed, the tightening device is provided between the output shaft of the drive means and the drive shaft to intermittently input the output of the drive means to the drive shaft. The first clutch to be driven, the second clutch provided on the drive shaft side of the first clutch, and the flywheel provided between the first clutch and the second clutch. And after pinching a workpiece | work with a movable body by rotating a drive shaft by a drive means, a 2nd clutch is made into a cutting | disconnection state, a flywheel is rotated with a predetermined rotational speed by a drive means, and a 1st clutch is then a cutting | disconnection state In addition, the second clutch is connected and the drive shaft is rotated by a flywheel to perform tightening.

  The molding machine of the present invention is a molding machine that moves the movable body by rotating a drive shaft screwed to the movable body by a driving means, and further tightens the movable body by further rotating the drive shaft. In the molding machine provided with the tightening device to perform, the tightening device is provided between the output shaft of the drive means and the drive shaft, and the first clutch is configured to intermittently input the output of the drive means to the drive shaft. A second clutch provided on the drive shaft side of one clutch and a flywheel provided between the first clutch and the second clutch. After the movable body is positioned at a predetermined position by rotating the drive shaft by the drive means, the second clutch is disengaged and the flywheel is rotated at the predetermined rotation speed by the drive means, and then the first clutch is The movable body is further tightened by turning the drive shaft with the flywheel while being in the disconnected state and the second clutch in the connected state.

  In the present invention, a first clutch is provided between the output shaft of the drive means and the drive shaft to intermittently input the output of the drive means to the drive shaft, and a second clutch is provided on the drive shaft side of the first clutch. In addition, a flywheel is provided between the first clutch and the second clutch to form an intensifier, and the second clutch is operated after the movable body is positioned at a predetermined position by rotating the drive shaft by the drive means. The flywheel is rotated at a predetermined rotational speed by the driving means with the cutting state in a disconnected state, and then the first clutch is disconnected and the second clutch is connected and the drive shaft is rotated by the flywheel to retighten. Therefore, the drive means does not need to be able to output a large torque, and it is only necessary to provide a single drive means that enables the movable body to move along the drive axis. The clamping mechanism can be briefly configured.

  Moreover, a vise or molding machine using this tightening device can be made compact, and the cost can be reduced.

  Further, in the tightening device, when the tightening is performed, the driving means and the drive shaft are disconnected by the first clutch, so that an excessive load can be prevented from acting on the driving means, and the driving means can be damaged. It is possible to suppress the occurrence of defects.

  In the tightening device of the present invention, the vise equipped with the tightening device, and the molding machine equipped with the tightening device, the drive shaft provided between the output shaft of the drive means and the drive shaft is provided. The tightening device is constituted by a first clutch for intermittently inputting to the second clutch, a second clutch provided on the drive shaft side of the first clutch, and a flywheel provided between the first clutch and the second clutch. In this configuration, a large torque driving force for tightening is obtained by a flywheel.

  Therefore, it is not necessary to provide a driving means capable of outputting a large torque, and the tightening device can be made compact and cost-effective.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic explanatory diagram of a servo vice B mounted on the molding machine A of the present embodiment. The molding machine A of this embodiment is a machining center, and is configured to automatically set a required workpiece W on the servo vice B and automatically execute a required molding process. In the present embodiment, the workpiece W is a substantially rectangular metal plate having a predetermined thickness.

  The servo vise B is fixedly mounted on the base 1 and has a base 10 with a fixed body 11 protruding from the upper surface, a movable body 12 provided on the upper surface of the base 10 so as to face the fixed body 11, and The drive shaft 13 is configured to be screwed to move the movable body 12 forward and backward, and the servo motor 14 is a drive means for rotating the drive shaft 13.

  In the present embodiment, the output shaft 14a of the servo motor 14 and the drive shaft 13 are not directly connected, but are interlocked and connected via the tightening device 20.

  In other words, the tightening device 20 is provided between the output shaft 14a of the servo motor 14 and the drive shaft 13, and the first clutch 21 for intermittently inputting the output of the servo motor 14 to the drive shaft 13, and the first clutch. 21 includes a second clutch 22 provided on the drive shaft 13 side, and a flywheel 24 attached to a connecting shaft 23 provided between the first clutch 21 and the second clutch 22.

  A first coupling gear 25 is mounted on the drive shaft 13 side of the second clutch 22, that is, the output side, and the first coupling gear 25 is meshed with the second coupling gear 15 mounted on the driving shaft 13, thereby serving as a servo motor. 14 is interlocked to the drive shaft 13.

  In FIG. 1, 16 is a clamping surface protection metal plate provided on the clamping surface side of the workpiece W of the fixed body 11, 17 is a clamping surface protection metal plate provided on the clamping surface side of the workpiece W of the movable body 12, and 18 is A cover case covering the rear portion of the movable body 12, 31 is provided on the side surface of the base 10, and a positioning sensor for detecting and positioning the starting point of the movable body 12, and 32 for operating the positioning sensor 31. A sensor detection body 19 mounted on the side surface of the movable body 12 is a guide body used for defining the origin of the workpiece W by abutting one side edge of the workpiece W sandwiched and fixed between the stationary body 11 and the movable body 12. It is.

  In FIG. 1, reference numeral 40 denotes a hammer for striking the work W sandwiched and fixed between the fixed body 11 and the movable body 12 to bring the work W into close contact with the base 10.

  In the following, the work for pinching and fixing the workpiece W with the servo vice B will be described with reference to FIGS. In the present embodiment, the first connecting gear 25 ′ and the second connecting gear 15 ′ are constituted by bevel gears, and the extending direction of the output shaft 14a of the servo motor 14 and the extending direction of the drive shaft 13 are substantially orthogonal to each other. Then, the servo motor 14 of the tightening device 20, the first clutch 21, the flywheel 24, and the second clutch 22 are arranged side by side in the vertical direction, and the tightening device 20 is extended and installed in the vertical direction. Yes. Therefore, the tightening device 20 can be made compact, and the flywheel 24 can be stabilized on the rotation of the flywheel 24 by being provided on the connecting shaft 23 extending in the vertical direction. It is possible to reduce the occurrence of micro vibrations associated with rotation.

  In the molding machine A, first, the movable body 12 of the servo vice B is retracted to the starting start position. That is, the first clutch 21 and the second clutch 22 are each in a connected state, and the servo motor 14 is rotated in the reverse direction to rotate the drive shaft 13 to move the movable body 12 backward. As shown in FIG. The sensor detection object 32 mounted on the side surface is retracted until it comes into contact with the positioning sensor 31 provided on the side surface of the pedestal 10, and is stopped when the sensor detection object 32 contacts the positioning sensor 31. Thus, the position defined by the sensor detection object 32 is the starting point.

  Next, the molding machine A advances the movable body 12 of the servo vice B to a predetermined position. That is, the molding machine A rotates the drive shaft 13 by moving the servo motor 14 forward a predetermined number of times by rotating the servo motor 14 a predetermined number of times with the first clutch 21 and the second clutch 22 connected, and advances the movable body 12 by a predetermined distance.

  Next, the molding machine A mounts the parallaxes 41 and 42 on the clamping surface protection metal plate 16 provided on the fixed body 11 and the clamping surface protection metal plate 17 provided on the movable body 12 by a transfer arm (not shown).

  The parallaxes 41 and 42 are formed of rectangular metal plates having a required thickness, and are mounted on the front surfaces of the clamping surface protection metal plates 16 and 17 by being mounted on the clamping surface protection metal plates 16 and 17, respectively. Of the workpiece W sandwiched and fixed between the fixed body 11 and the movable body 12 by adjusting the shape of the parallax 41, 42. The clamping position for the fixed body 11 and the movable body 12 can be adjusted.

  In this way, by using the parellers 41 and 42, the workpiece W can be positioned and held at a position where the workpiece W is not warped with the clamping of the workpiece W between the fixed body 11 and the movable body 12. The processing accuracy of W can be improved.

  As shown in FIG. 3, magnets M are mounted on the parlors 41 and 42 on the side of the joint surface with the clamping plate protection metal plates 16 and 17, respectively. The metal plates 16 and 17 can be mounted stably and detachably.

  In this embodiment, the parellas 41 and 42 are housed in a parella housing portion (not shown) when not in use, and when used, the required parellers 41 and 42 are taken out from the parella housing portion by a transfer arm to protect the clamping surface. The metal plates 16 and 17 are attached respectively.

  Further, in the present embodiment, the parallers 41 and 42 are attached after the movable body 12 is advanced to a predetermined position. However, the parellers 41 and 42 are attached to the movable body 12 and the fixed body 11 at the starting point. Wearing may be performed.

  After mounting the parellas 41, 42, the molding machine A places a required workpiece W on the shelf surface formed by the parellers 41, 42 by a transfer arm (not shown), and then the molding machine A performs the first clutch. The drive shaft 13 is rotated by rotating the servo motor 14 a predetermined number of times with the 21 and the second clutch 22 in the connected state, and the movable body 12 is advanced as shown in FIG. I do.

  When the work W is placed on the shelf surface formed by the parallaxes 41 and 42, the work W is placed with one end of the work W being brought into contact with the guide body 19 mounted on the fixed body 11. Is properly clamped and fixed.

  After the workpiece W is temporarily clamped and fixed, the molding machine A makes the workpiece W adhere to the base 10 by hitting the workpiece W with a hammer 40 as shown in FIG.

  In other words, a hammer head 40a that can be moved back and forth is provided at the tip of the hammer 40 that hangs downward, and the hammer head 40a is dropped to strike the workpiece W. .

  In particular, in this embodiment, the hammer head 40a is attracted to the hammer main body 40b by a magnet, and after the hammer 40 is positioned at a required position above the workpiece W, the hammer head 40a is magnetized by a separating means (not shown). The workpiece W is hit by the hammer head 40a by being separated from the hammer main body 40b to the outside of the influence range due to the magnetic force of the magnetic head and dropping the hammer head 40a freely.

  In this embodiment, the separating means is an operation arm that sandwiches the hammer head 40a and lowers it from the hammer body 40b by a predetermined distance. In FIG. 4, reference numeral 40c denotes a connecting rod that connects the hammer head 40a and the hammer body 40b.

  After dropping the hammer head 40a and hitting the workpiece W, the hammer body 40b is lowered to adsorb the hammer head 40a to the hammer body 40b, and the hammer body 40b is raised to bring the hammer head 40a to a predetermined height. I try to raise it.

  The molding machine A is provided with an acoustic sensor or a vibration sensor (not shown) that detects sound or vibration generated when the work W is hit with the hammer head 40a. From the detection results of these acoustic sensors or vibration sensors. The degree of adhesion of the workpiece W to the base 10 is detected. When the degree of adhesion is low, the hammer head 40a is repeatedly dropped and brought into a predetermined adhesion state.

  In this way, the hammer head 40a can be attached to and detached from the hammer body 40b by using a magnet, so that the configuration of the hammer 40 can be simplified, the cost can be reduced, and the maintainability can be improved. Can be made.

  As described above, the workpiece W is temporarily clamped and fixed, and after the close-contact operation to the base 10 is completed, the movable body 12 is tightened.

  That is, the molding machine A sets the flywheel 24 in a required rotation state by setting the second clutch 22 in the disconnected state and rotating the servo motor 14 in the forward state with the first clutch 21 in the connected state.

  When the flywheel 24 reaches the required rotational state, the molding machine A puts the first clutch 21 in the disconnected state and the second clutch 22 in the connected state, so that the drive shaft 13 is moved by the flywheel 24. The movable body 12 is tightened by rotating.

  By performing the tightening using the flywheel 24 in this way, it is possible to accurately adjust the torque applied to the drive shaft 13 for the tightening and always perform the tightening with a predetermined torque. .

  In addition, since the first clutch 21 is in the disconnected state at the time of tightening, it is possible to prevent an excessive load from acting on the servo motor 14, thereby eliminating the possibility that the servo motor 14 will fail.

  In particular, the servo motor 14 does not need to use a servo motor that can output a large torque for tightening, and can move the movable body 12 by rotating the drive shaft 13 at high speed. It is only necessary to use a servo motor, and the cost of the molding machine A can be reduced, while a large torque can be generated by the flywheel 24.

  In the present embodiment, the servo motor 14 determines the rotational speed of the output shaft 14a for rotating the flywheel 24 with the second clutch 22 disengaged (hereinafter referred to as “rotational speed for tightening”) The rotational speed of the output shaft 14a to be moved (hereinafter referred to as "moving rotational speed") is set to generate a large torque, but the tightening rotational speed is not necessarily higher than the moving rotational speed. The rotational speed for tightening and the rotational speed for movement may be the same, or the rotational speed for movement may be larger.

  However, since the flywheel 24 is also rotating when the movable body 12 is moved, the influence of the inertia of the flywheel 24 increases when the rotational speed for movement is increased, so the rotational speed for movement is relatively low. It is desirable to be.

  When the workpiece W is taken out from the servo vice B after performing the required forming process on the workpiece W clamped and fixed by the servo vice B as described above, the workpiece W is clamped and fixed by moving the movable body 12 backward. The work W is taken out by a transfer arm (not shown).

  When a large torque is required when the movable body 12 is moved backward, the molding machine A causes the second clutch 22 to be in a disconnected state and the first clutch 21 to be in a connected state to reversely rotate the servo motor 14. Rotate the flywheel 24 in the opposite direction to the case of tightening, and when the flywheel 24 is in the required rotation state, the first clutch 21 is disengaged and the second clutch 22 is engaged so that a large torque is applied. The output is output to rotate the drive shaft 13 so that the movable body 12 is retracted.

  Therefore, when the tightened movable body 12 is moved backward, it is possible to prevent an excessive load from being generated in the servo motor 14 and to prevent a failure from occurring in the servo motor 14.

  In the servo vice B provided with the tightening device 20 having the flywheel 24 as described above, a servo motor for large torque output can be dispensed with, so that the cost can be reduced and the configuration can be made compact. be able to.

  Furthermore, by configuring the forming machine A by providing a clamping / fixing state confirmation mechanism using the hammer 40, it is possible to automate, including the operation of fixing the workpiece W, and a plurality of workpieces are continuously formed fully automatically. A molding machine A to be processed can be formed. Further, the molding machine A can be provided with a device such as an air blower as appropriate so that the cutters can be scattered, whereby the molding machine A with higher processing accuracy can be obtained.

  In the above-described embodiment, the molding machine A is a machining center, but is not limited to the machining center, and the above-described tightening device may be appropriately used for a molding machine that requires tightening.

  For example, an injection molding machine comprising a fixed mold and a movable mold, wherein the movable mold is screwed to the drive shaft and is configured to advance and retract along the drive shaft based on the rotation of the drive shaft. In the molding machine, after the movable mold is brought into contact with the fixed mold, the movable mold may be tightened by the above-described tightening device.

It is a schematic explanatory drawing of the molding machine equipped with the servo vice according to the present invention. It is process explanatory drawing of the clamping work of the workpiece | work by a servo vise. It is process explanatory drawing of the clamping work of the workpiece | work by a servo vise. It is process explanatory drawing of the clamping work of the workpiece | work by a servo vise.

Explanation of symbols

A Molding machine B Servo vice W Work 1 Base
10 pedestal
11 Fixed body
12 Movable body
13 Drive shaft
14 Servo motor
15,15 '2nd connecting gear
16 Metal plate for clamping surface protection
17 Metal plate for clamping surface protection
18 Cover case
19 Guide body
20 Tightening device
21 First clutch
22 Second clutch
23 Connecting shaft
24 flywheel
25,25 '1st connecting gear
31 Positioning sensor
32 Sensor object
40 Hammer
40a Hammerhead
40b Hammer body
40c connecting rod
41,42 Parella M Magnet

Claims (3)

In the tightening device for tightening the movable body by rotating a shaft screwed to the movable body by a driving means
A first clutch is provided between the output shaft of the driving means and the shaft to intermittently input the output of the driving means to the shaft, and a second clutch is provided on the shaft side of the first clutch, Furthermore, a flywheel is provided between the first clutch and the second clutch,
After the movable body is positioned at a predetermined position by rotating the shaft by the driving means, the second clutch is disengaged and the flywheel is rotated by the driving means at a predetermined rotational speed, and then the A tightening device, wherein the first clutch is disengaged and the second clutch is engaged and the shaft is rotated by the flywheel to perform tightening. A vise that moves and moves the movable body by rotating a drive shaft screwed to the movable body by a drive means, and further moves the movable body to further clamp the workpiece by further rotating the drive shaft. In a vise equipped with a tightening device that tightens the body,
The tightening device is
A first clutch provided between the output shaft of the drive means and the drive shaft to intermittently input the output of the drive means to the drive shaft, and a second clutch provided on the drive shaft side of the first clutch A clutch, and a flywheel provided between the first clutch and the second clutch,
After pinching the workpiece with the movable body by rotating the drive shaft by the drive means, the second clutch is disengaged and the flywheel is rotated at a predetermined rotational speed by the drive means, and then A vise characterized in that the first clutch is disengaged and the second clutch is engaged and retightening is performed by rotating the drive shaft by the flywheel. A molding machine that moves the movable body by rotating a drive shaft screwed to the movable body by a driving means, and includes a tightening device that further tightens the movable body by further rotating the drive shaft. In the molding machine
The tightening device is
A first clutch provided between the output shaft of the drive means and the drive shaft to intermittently input the output of the drive means to the drive shaft, and a second clutch provided on the drive shaft side of the first clutch A clutch, and a flywheel provided between the first clutch and the second clutch,
After the movable body is positioned at a predetermined position by rotating the drive shaft by the drive means, the second clutch is disengaged and the flywheel is rotated at a predetermined rotational speed by the drive means, and then A molding machine characterized in that the first clutch is disengaged and the second clutch is engaged and the drive shaft is rotated by the flywheel to retighten the movable body.

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