JPH0529607U - Work pusher - Google Patents

Abstract

(57) [Summary] [Structure] The mounting frame 10 mounted on the turret 4 of the tool rest 3 mounted on the saddle 5 driven by the servo motor 6 and positioned by the ball screw 7 parallel to the spindle axis direction is A cylinder 11 is formed in the end surface on the main shaft 1 side. A piston 14 that is inserted so as to be movable only in the axial direction of the spindle has a tip 14 on the spindle side that has a metal plate 14 that presses a workpiece W against a pawl abutting surface 2a of the chuck 1, and the piston rod 12 and the cylinder. An oil chamber 15 formed by 11 and 11 is filled with hydraulic oil, and a pressure sensor 16 for detecting the hydraulic pressure of the hydraulic oil is provided at one end of the oil chamber 15. [Effect] When the metal contacts the end surface of the temporarily received work, the piston rod moves backward to increase the pressure in the cylinder, and when the predetermined pressure is reached, the chuck is relaxed and the work pressed by the metal is the nail contact surface of the chuck. The chuck re-grasps where it has completely contacted.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a work pusher that allows a chuck of a machine tool to accurately grip a work, and more particularly to a work pusher that can freely set a pressing force for work of different weights without setup changes such as spring replacement.

[0002]

[Prior Art]

 Generally, when a workpiece W conveyed by a conveying device such as a robot or a loader is automatically gripped by the chuck 1, the workpiece W is accurately placed on the claw abutting surface 2a of the chuck 1 in order to determine the machining position between the spindle and the workpiece W. A work pusher that presses against is used. FIG. 3 shows a conventional work pusher. A mounting frame 10 having a blind hole formed on the tool mounting surface of a moving table such as the turret 4 of the tool rest 3 or a tailstock has its spindle centered on the spindle axis. It is mounted parallel to the core, and the piston rod 12 is inserted into the blind hole so as to be movable only in the axial direction. A spring 17 is interposed between the rear side of the piston rod 12 and the bottom of the blind hole, and is constantly biased so as to project toward the chuck side, and is regulated by the lid 13 so as not to project from the blind hole. An abutment plate 14 for pressing the work W against the claw abutting surface 2a of the chuck 1 is provided at the tip of the piston rod 12, and the end face of the work W is pressed by the T-shaped abutment plate 14 and the piston rod 12. By moving the turret 4 of the tool rest 3 or the tailstock, which is a moving base, in the axial direction of the main shaft and bringing the contact 14 into contact with the work W, the spring 17 inside the work pusher contracts. The work W is pressed against the claw contact surface 2a of the chuck 1. However, according to this, since the pressing force is determined by the spring constant, if the work weight is large, the spring will stick and the elastic body will not move unless the spring is replaced. There is a problem that an unreasonable load may be applied to the drive mechanism such as the turret, and a thin work piece with a small weight may have too much pressing force to deform the work piece. Therefore, the spring of the work pusher is replaced with a spring having a spring constant suitable for the weight of the work to increase the pressing force.

[0003]

[Problems to be solved by the device]

 However, in order to replace the spring, the cutting work must be stopped, which increases the work production time. Therefore, the problem of this invention is to automate the setting of the pressing force to the work in the work pusher, simplify the work process, and improve the life of the drive mechanism of the moving table such as the tool post to which the work pusher is attached. Providing a work pusher.

[0004]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the present invention is a work pusher for accurately gripping a workpiece by chucking it by pressing a metal plate against the end surface of the workpiece temporarily gripped by the chuck. The moving table that can move in the axial direction of the is equipped with a cylinder mechanism that allows the piston rod to move back and forth in the moving direction, and the cylinder mechanism is equipped with a pressure sensor that detects the pressure of the fluid filled in the cylinder. At the same time, a metal plate is attached to one end of the piston rod on the chuck side, and a stop means is provided for stopping the drive mechanism of the movable table when the pressure sensor detects a predetermined pressure.

[0005]

[Action]

 According to the work pusher of this invention, the drive mechanism moves the moving base in the axial direction of the main shaft, and the metal plate attached to the chuck side end of the piston rod is pressed against the end surface of the work temporarily held by the chuck. As a result, the piston rod that can move back and forth in the moving direction gradually increases the pressure of the fluid filled in the cylinder of the cylinder mechanism, and when the pressure sensor in the cylinder mechanism detects a predetermined pressure, the stop mechanism drives the moving base. The mechanism can be stopped, and the work piece having a predetermined pressure can press the work, and the work can be accurately gripped.

[0006]

Embodiments Embodiments embodying the present invention will be described below with reference to the drawings. In the explanatory view of the work pusher in FIG. 1, reference numeral 1 denotes a chuck attached to a main shaft of a lathe, and a work W conveyed by a conveying device (not shown) is held by a chuck claw 2. Reference numeral 3 denotes a tool rest which is a movable stand facing the chuck 1, and 4 denotes a turret provided on the lateral surface of the spindle side. The tool rest 3 is placed on a saddle 5 positioned in the x-axis direction, and the saddle 5 is driven by a servomotor 6 and is positioned in the z-axis direction by a ball screw 7 parallel to the spindle axis direction. Since it is determined, the position of the tool rest 3 can be similarly controlled in the z-axis direction, which is the direction of the main shaft axis.

Reference numeral 10 denotes a work pusher mounting frame mounted on the tool mounting surface of the tool rest 3, and a cylinder 11 having blind holes bored in parallel with the spindle axis direction is mounted on the spindle-side end surface thereof. The piston rod 12 is fitted into the cylinder 11 so as to be movable only in the axial direction of the main shaft, and is regulated by a lid 13 so as not to protrude from the blind hole. The tip end of the piston rod 12 on the main shaft side has an abutment 14 for pressing the work W against the claw abutting surface 2a of the chuck 1. An oil chamber 15 formed by the rear end of the piston rod 12 and the cylinder 11 is filled with hydraulic oil, and one end of the oil chamber 15 is provided with a pressure sensor 16 for detecting the hydraulic pressure of the hydraulic oil via a flow path. And constitutes a cylinder mechanism. The detection signal from the pressure sensor 16 is output to a control mechanism (not shown) of a drive mechanism that controls the position of the tool rest 3. This detection signal is a command that is output when the specified hydraulic pressure that has been input in advance has been exceeded.The specified hydraulic pressure to be set can be input appropriately by an operator, or it can be more appropriate than the weight during transportation detected by installing a weight sensor It is also possible to convert the hydraulic pressure and directly input it.

When the work pusher configured as described above is used, first, as shown in FIG. 2, a predetermined pressure suitable for the weight of the work or the like is set in the pressure sensor (S1). Next, when the work W is transferred to the position of the chuck 1 by a transfer device such as a loader or a robot and the work W is temporarily received by the chuck 1 up to the position shown by the chain double-dashed line in FIG. 1, the ball screw 7 is rotated by the servo motor 6 by a command. Then, the tool rest 3 advances toward the chuck 1 to press the work (S2). At this point, the oil pressure in the oil chamber 15 is almost zero. Since the work piece W of the piston rod 12 comes into contact with the work W and the work W is temporarily received and does not move, the oil pressure in the oil chamber 15 increases as the tool rest 3 continues to move, and the pressure sensor 16 sequentially detects that. The hydraulic pressure is detected (S3). It loops to S2 until it reaches a predetermined hydraulic pressure and continues to detect pressure. When the predetermined hydraulic pressure is reached, a command is output to the control mechanism to stop the drive mechanism of the tool rest 3, and the tool is used to stop the tool rest 3. By stopping and then loosening the chuck claws 2, the work W pressed against the abutment 14 of the piston rod 12 is reliably pressed against the claw abutting surface 2a of the chuck 1 (S4).

The present invention is not limited to the above-described embodiment, and, for example, air pressure which is a fluid instead of working oil can be used, or the oil chamber 15 and the cylinder 11 can be used. An oil chamber is formed by the front end corresponding to the opposite surface of the piston rod 12, and the negative pressure generated in the oil chamber filled with hydraulic oil by the piston rod 12 moving forward to the end face of the temporarily received work W is detected, The cutting oil is supplied to the oil chamber 15 via the control valve, and when the oil chamber becomes higher than a predetermined pressure due to the time lag until the drive mechanism of the moving base stops, it is discharged to the cutting oil tank as a relief valve. It is also possible to embody the present invention by appropriately changing the shape and configuration of each part without departing from the spirit of the present invention.

[0010]

[Effect of the device]

 As described above in detail, according to the present invention, a pressure sensor for detecting the pressure in the cylinder in which the piston rod for mounting the metal contacting the end face of the temporarily received work is moved forward and backward is provided to reach the predetermined pressure. When this happens, the chuck is loosened and the work piece comes into contact with the claw abutment surface of the chuck to grip the chuck again, so the setup for replacing the spring can be omitted, shortening the work piece production time, and automating different work pieces. In addition to enabling operation, the pressing force suitable for the weight of the work can be set automatically, which prevents deformation of the work and improves the life of the drive mechanism such as the tool post to which the work pusher is attached.

[Brief description of drawings]

FIG. 1 is an explanatory view of a work pusher showing an embodiment of the present invention.

FIG. 2 is a flow chart of the embodiment.

FIG. 3 is an explanatory diagram of a conventional work pusher.

[Explanation of symbols]

1 ... Chuck, 2 ... Chuck claw, 2a ...
3 ... Turret, 4 ... Turret, 5 ... Saddle, 6 ...
Servo motor, 7 ・ ・ Ball screw, 10 ・ ・ Mounting frame,
11 ... Cylinder, 12 ... Piston rod, 13 ...
Lid, 14 ... Drain, 15 ... Oil chamber, 16 ... Pressure sensor, 17 ... Spring, S1 to S4.

Claims (1)

[Scope of utility model registration request] 1. A work pusher for accurately gripping a workpiece by chucking the end face of the workpiece temporarily gripped by the chuck, which is movable by a drive mechanism in the axial direction of the spindle. The table is equipped with a cylinder mechanism that allows the piston rod to move back and forth in the direction of its movement.The cylinder mechanism is equipped with a pressure sensor that detects the pressure of the fluid filled in the cylinder, and at the chuck-side end of the piston rod. A work pusher equipped with a metal member and having a stopping means for stopping the drive mechanism of the moving table when the pressure sensor detects a predetermined pressure.