JP2009039813A - Press-fitting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a press-fitting device reducing installation costs because it is not necessary to newly provide a pull-out force inspection device by providing a function to inspect the pull-out force of a press-fitting component. <P>SOLUTION: This press-fitting device includes: a fixed surface plate 2 having clamp means E; a frame body 3 provided on the fixed surface plate 2; linear motion means A coupled to the frame body 3; position detection means B detecting the position of the movable ram 14 of the linear motion means A; a load cell 4 which is coupled to the end of the movable ram 14 of the linear motion means A and which measures a press-fitting load advancing the movable ram 14 to press-fit a first workpiece W1 to a second workpiece W2 and a tensile load retreating the movable ram 14 after press-fitting and used for inspecting the pull-out force; a tension mechanism C which is coupled to the load cell 4 toward the first workpiece W1 and second workpiece W2 and which is engaged with the first workpiece W1 when inspecting the pull-out force after press-fitting; and control means D controlling the movement of the linear motion means A and tension mechanism C. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a press-fitting device. More specifically, the present invention relates to a press-fitting device that can perform a force-in-force inspection of a press-fitted component following the component press-fitting process.

  Conventionally, various press-fitting devices for press-fitting a work (part) into another work (part) have been proposed (for example, Patent Document 1). In the press-fitting process in this press-fitting device, an important condition for the quality of the press-fitted parts (assembled parts) after press-fitting is that even if force is applied to the parts, it cannot be removed. Conventionally, in the prototype stage, the correlation between the force required for press-fitting (press input) and the force that causes parts to escape (removal force) has been shown, and in the production stage, the pressure input indicated by the correlation is used. If it was press-fitted, it was judged as a good product.

JP 2005-7436 A

However, since the conventional method does not actually determine the removal force, for example, it is insufficient to investigate the correlation at the prototype stage. There is a risk that it may be determined.
Further, when obtaining the correlation in the trial production stage, a separate device for actually performing the pulling force inspection is required, and there is a problem that it is expensive to newly install the device.

  Accordingly, in view of the above circumstances, the present invention provides a press-fitting device that can reduce the equipment cost by eliminating the need to newly install a pull-out force inspection device by providing a press-fitting component removal force inspection function. The purpose is to do.

  The press-fitting device of the present invention is a press-fitting device for press-fitting a first work into a second work, and is a fixed surface plate having a clamping means, a frame body provided on the fixed surface plate, and connected to the frame body. A linear motion means; a position detection means for detecting the position of the movable ram of the linear motion means; and a second ram that is connected to the distal end of the movable ram of the linear motion means and advances the movable ram to the second work A load cell capable of measuring a press-fit load to be press-fitted into the workpiece and a tensile load for pull-out force inspection by retracting the movable ram after press-fitting, and being connected to the load cell toward the first workpiece and the second workpiece side It is characterized by comprising a pulling mechanism that engages with the first workpiece during the pulling force inspection after the press-fitting, and a control unit that controls the operation of the linear motion unit and the pulling mechanism.

According to the present invention, since the pulling force inspection of the press-fitted parts in which the first work is press-fitted into the second work can be performed by the tension mechanism following the press-fitting process, it is not necessary to newly install a pull-out force inspection device. Cost can be reduced.
In addition, it is possible to inspect all the removal force even in cases where the release force is estimated from the pressure input and the quality is guaranteed, for example, in the bearing press-fitting process to the shaft and the gear press-fitting process of the transmission (transmission). The non-defective product can be passed to the next process without fail.

The press-fitting device according to the present invention is a press-fitting device for press-fitting a first work into a second work, and uses a servo motor as a press-fitting device or a drive source using a cylinder using air or oil as a drive source. It can be applied to a direct-motion type press-fitting device that makes the rotation of the ball screw linearly move. The first work is a bearing of a cylindrical part, a metal ring, etc., and the second work is a shaft assembled with the bearing, a cylindrical insulator assembled with the metal ring, and the like.
Hereinafter, the press-fitting device of the present invention will be described with reference to the accompanying drawings. As shown in FIG. 1, a press-fitting device according to an embodiment of the present invention includes a fixed surface plate (table) 2 placed on a base 1 and a frame body standing on the fixed surface plate 1. 3, linear motion means A connected to the ceiling frame 3 a of the frame body 3, position detection means B for detecting the position of the movable ram 14 of the linear motion means A, and movable ram 14 of the linear motion means A The load cell 4 is connected to the front end, the tension mechanism C is connected to the load cell 4 toward the first work W1 and the second work W2, and the control means D. The press-fitting device according to the embodiment has a saddle type arrangement, but can be a horizontal type arrangement. That is, the press-fitting device is configured so that the direction in which the first workpiece W1 is press-fitted into the second workpiece W2 is the vertical direction, but can be configured to be the horizontal direction.

  The first workpiece W1 is held by the positioning mold jig 5, or is positioned and press-fitted into the second workpiece W2 by any other appropriate method. The second workpiece W2 is fixed by a clamping means E provided on the fixed surface plate 2, for example, a fixing jig using a chuck or a claw.

  In the present embodiment, the linear motion means A is composed of a servo motor 12 and an electric cylinder 13 to which an encoder 11 as the position detection means B is attached. The electric cylinder 13 includes a connecting mechanism that converts the rotation of the servo motor 12 into a linear motion of a ball screw (not shown), and is configured to move the movable ram 14 up and down. Although the position of the movable ram 14 is detected by the encoder 11, in the present invention, a linear gauge (not shown) provided in the vicinity of the first workpiece W1 is used instead of the encoder 11. Thus, the position of the movable ram 14 can also be detected.

  The load cell 4 measures the press-fit load for pressing the first work W1 into the second work W2 by moving the movable ram 14 forward and the tensile load for removing the force after the press-fit. In the present invention, there is no particular limitation as long as the configuration can be used for both tension and compression. For example, a tension / compression load cell (LUK-A-SA1 series) (trade name: manufactured by Kyowa Denki) is used. Can do.

  The pulling mechanism C is a mechanism that can be engaged with the first work W1 during the pulling force inspection after the press-fitting. In the present embodiment, the pulling mechanism C includes a pair of claws 22 that are pivotally supported by the rotating shaft 21. It is a mechanism that rotates (opens and closes) in the reverse direction by a motor (not shown). In the present invention, the tension mechanism C is not limited to an opening / closing mechanism by a motor, and a mechanism for moving a pair of claws in the opposite direction by a screw shaft can be appropriately selected and used.

The control means D is not particularly limited in the present invention as long as it can control the operations of the linear motion means A and the tension mechanism C. In this embodiment, the control means D outputs a pulse or a voltage to the driver. A command feedback section, a position feedback section that can input encoder position information via a driver (sometimes directly with linear gauge position information), and a load feedback section that can input load cell load information via an A / D converter. A storage medium for storing the operation pattern of the press-fitting and tensioning process, and a CPU (arithmetic circuit) for comparing and calculating the position and load information fed back from the position feedback unit and the load feedback unit with numerical values in the operation pattern The controller 31 is provided. The controller 31 is electrically connected to the servo motor 12 and the encoder 11 via a driver 32, and is electrically connected to the load cell 4 via an A / D converter 33.
In addition, the controller 31 is connected with an operation unit 41 and a display unit 42 that include a touch panel, lamps, buttons, and the like. In this embodiment, the start and stop of the process, the parameter change, the display, and the operation status Can be displayed.

  In the present embodiment, the movable ram 14 is moved up and down by rotating the servo motor 12. The position of the movable ram 14 is measured by the encoder 11 attached to the servo motor 12. The servo motor 12 feeds back the position information measured by the encoder 11 to the driver 32 and performs position control. The target operation of the movable ram 14 is input to the driver 32 by the controller 31. The pressure input and the pulling force (pulling force) are detected by the load cell 4, converted from an analog signal to a digital signal, and input to the controller 31. The controller 31 controls the servo motor 12 by feeding back the signals of the press-fit load and the tensile load. The tension mechanism C is also controlled by the controller 31 so that the first work W1 that has been press-fitted can be grasped by opening the claw 22 during press-fitting and closing the claw 22 during tension.

Further, at the time of press-fitting work, the first work W1 is pressurized and press-fitted to the second work W2 while the claw 22 of the tension mechanism C is opened. Specify whether the position of the movable ram 14 obtained from the encoder 11 has reached the target position, whether the load acquired from the load cell 4 has reached the target load, or whether the indentation load curve has detected an inflection point The press-fit is completed when the press-fit end condition is satisfied.
Next, after completion of press-fitting, the position or load is held for a certain period of time, and then the process proceeds to a pulling process for removing force inspection. The claw 22 of the tension mechanism C is closed and the movable ram 14 is raised. Next, when the set tensile force is detected, it returns to the starting position of the tensioning process, opens the pawl 22 of the tensioning mechanism C, and the movable ram 14 rises to the work origin.

  As described above, in the present embodiment, by installing the tension / compression shared load cell and the tension mechanism, after the press-fitting process of press-fitting the first work into the second work, the press-fitting parts of the first work and the second work are subsequently continued. Since the removal force inspection can be performed, it is not necessary to newly install a removal force inspection device, and the equipment cost of the press-fitting device can be reduced.

1 is a diagram illustrating a schematic configuration of a press-fitting device according to an embodiment of the present invention.

Explanation of symbols

A linear motion means B position detection means C tension mechanism D control means E clamping means W1 first work W2 second work 1 base 2 fixed surface plate 3 frame body 3a ceiling frame 4 load cell 11 encoder 12 servo motor 13 electric cylinder 14 movable Ram 21 Rotating shaft 22 Claw 31 Controller 32 Driver 33 A / D converter 41 Operation unit 42 Display unit

Claims (1)

A press-fitting device for press-fitting a first work into a second work,
A fixed surface plate having clamping means;
A frame body provided on the fixed surface plate;
Linear motion means coupled to the frame body;
Position detecting means for detecting the position of the movable ram of the linear motion means;
Connected to the tip of the movable ram of the linear motion means and advances the movable ram to press-fit the first work into the second work, and retracts the movable ram after the press-fitting to inspect the pulling force. A load cell capable of measuring tensile load,
A tension mechanism that is connected to the load cell toward the first workpiece and the second workpiece and that engages with the first workpiece at the time of the pulling force inspection after the press-fitting,
A press-fitting device comprising a linear motion means and a control means for controlling the operation of the tension mechanism.