JPH07112308A - Joe drive device for nc lathe - Google Patents

Abstract

PURPOSE:To prevent collision of a tool post against a joe so as to enable an efficient work by providing a joe movably in the radial direction of a face plate mounted on a head stock rotatably, and moving it through a joe drive mechanism by the motive power of a servo motor. CONSTITUTION:A face plate 6 is mounted on each opposite tip of a pair of a head stock moved to and for on a bed, and a plurality of joes for holding a workpiece on each face plate 6 is arranged in the radial direction. In the face plate 6 a ball screw 31 is arranged turnably as the drive means for the face plate 6 and joe 30 is fixed to a ball nut 32 moving in the radial direction while being guided along a guide groove arranged at the face plate 6 through the rotation of the screw 31. This joe rotates the face plate 6 and connects a clutch plate 34 to a clutch plate 35 in a face-to-face relation, and thereafter a servo motor 36 is operated, thereby rotating the screw 31 through a bevel gear 33. The joe 30 can be moved in the radial direction together with the nut 32 in this way.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an NC lathe jaw driving device for easily moving a jaw of an NC lathe to a proper radial position. Especially, it is set to avoid the interference of the blade and the jaw moved to the proper radial gripping position when the wheel lathe is used to correct the wheels of a train or locomotive during use. The present invention relates to a jaw driving device of an NC lathe that can easily obtain barrier coordinate data.

[0002]

2. Description of the Related Art A plurality of jaws (claws) for moving in a radial direction and appropriately gripping a work are attached to a face plate of a headstock. Examples of the work include wheels of trains, freight cars, locomotives, and the like that are worn away by friction with a running track. Wheel flanges and treads are worn out and wear into different shapes for each wheel. The longer a mileage of a wheel subjected to wear is, the more the shape of the wheel changes to a complicated shape deviating from the regular profile, and the diameter of the tread also varies from wheel to wheel. Therefore, when the vehicle reaches a certain mileage, the tread surface of each wheel is re-turned so that the tread surface has a uniform diameter. When such a correction is performed, the jaw that holds the wheel, which is the work, is positioned at an appropriate holding position in the radial direction according to the diameter of the wheel.

In driving the jaws of a conventional lathe, the jaws are manually operated for each wheel, so that the efficiency of the correction machining is poor. In particular, every time the jaw was manually operated to move the gripping position of the wheel, the movement of the jaw was used to visually check the safety in order to avoid interference between the jaw and the cutting tool. .

[0004]

The present invention has been made under the technical background as described above, and achieves the following objects.

An object of the present invention is to provide a jaw driving device for an NC lathe which can perform efficient machining by preventing collision between the tool rest and the jaw and positioning the jaw by driving the servo motor. is there.

Another object of the present invention is to provide a jaw driving device for an NC lathe which can perform more efficient machining by positioning the jaws by driving a servo motor and easily obtaining coordinate data for creating a barrier. To do.

[0007]

The means for solving the problems of the present invention will now be described, in which the components of the present invention are shown in parentheses in correspondence with one or several embodiments. The reason for adding is to refer to the correspondence relationship between the components of the present invention and the embodiment in an easy-to-understand manner, and not to limit the present invention to the embodiment.

The jaw drive device of the NC lathe of the present invention is
A face plate (6) rotatably attached to the headstock (4, 5), a jaw (30) provided on the face plate (6) movably in the radial direction of the face plate (6), and the face plate ( 6) A jaw driving mechanism (31, 3) for driving the jaw (30) in the radial direction of the face plate (6).
3, 39, 42, 43, 44) and a servo motor (36, 45) capable of outputting a rotation angle signal of an output shaft (38) coupled to the jaw driving mechanism (31, 33, 39, 42, 43, 44). ) And consists of.

It is preferable that it comprises an arithmetic processing unit for receiving the rotation angle signal of the servo motors (36, 45) and arithmetically processing the coordinates of the barrier.

[0010]

In the jaw drive device of the NC lathe according to the present invention, the jaw is driven by the servomotor to move in the radial direction. Further, the drive amount of the jaw is input to the NC device. The NC device calculates the coordinate position of the barrier so as not to interfere with the tool.

[0011]

【Example】

(Embodiment 1) Next, Embodiment 1 of the jaw driving device for the NC lathe of the present invention will be described. FIG. 1 is a front view showing a first embodiment of an NC lathe for wheel grinding. A guide surface is formed on the upper surface of the bed 1, and a pair of left and right bases 2 and 3 are provided which are guided by the guide surface and move back and forth in opposition to each other. The bases 2 and 3 are driven back and forth in opposition to each other by a screw which is rotationally driven by a hydraulic cylinder device or a servomotor. Headstocks 4 and 5 are fixed to the upper surfaces of the bases 2 and 3, respectively, and the headstocks 4 and 5 are moved back and forth on the bed 1 so as to face each other. Face plates 6 are attached to the tips of the headstocks 4 and 5 facing each other.

Each of the face plates 6 and 6 has a plurality of radially moving jaws (described later) for gripping the work. On the bases 2 and 3, the vertical direction, that is, X
Saddles 7 and 8 are provided so as to be movable in the direction, and tool rests 9 and 10 are mounted on the saddles 7 and 8 so as to be movable in the Z-axis direction. With the tools of the tool rests 9 and 10, the wheel flanges and treads, which will be described later, are cut. Rails 11 and 12 are attached to the front end positions of the bases 2 and 3 facing each other in the X-axis direction. Beds 1 have loading rails 11a and 12a so as to be connected to rails 11 and 12.
Is located in front of. Further, a carrying-out rail (not shown) is arranged on the side opposite to the carrying-in rails 11a and 12a with the rails 11 and 12 as the center. The wheels roll on the carrying-in rails 11a and 12a and the rails 11 and 12 and are transferred to the NC lathe.

These rails 11, 12 are bases 2, 3
Move together with. The rail width can be adjusted by adjusting the retreat distance of the bases 2 and 3. Rail 1
Mechanisms (not shown) for stopping the wheels W at fixed positions are provided on the bases 1 and 12 on the bases 1 and 12, respectively. Such a mechanism is publicly known, for example, Japanese Examined Patent Publication No. 59-9764.
The description is not repeated here as it is explained in detail in the issue.

A pair of limit switches 14 and 15 are mounted on the bed 1 through fixed columns 16.
A lifter 20 is vertically movable between left and right rails that constitute the fixed position stop rail. Lifter 20
Is driven up and down by a hydraulic device (not shown). The limit switches 14 and 15 are used to detect the height positions of the wheels on the left and right of the wheel axle lifted by the lifter 20 and to align the center of the wheel axle with the machine center. Note that the lifter 20 has auxiliary lifting devices (not shown) that are individually lifted up and down with respect to the body of the lifter on the left and right sides. When the lifter 20 moves up and down, it moves up and down while the left and right wheels are supported by this auxiliary lifting device.

FIG. 2 shows a jaw driving device for driving the jaw 30. The jaw 30 on one side is attached to the face plate 6 on one side so as to be movable in the radial direction.
A ball screw 31 is rotatably provided in the face plate 6 as a driving means for driving the face plate. Ball screw 3
By the rotation of 1, the jaw 30 is fixed to the ball nut 32 which is guided in a guide groove (not shown) provided in the face plate 6 and moves in the radial direction.

A pair of bevel gears 33 are rotatably provided in the face plate 6. One body 33 a of the bevel gear 33 is coupled to one end of the ball screw 31. Other body 33b of bevel gear 33
Is coupled to the jaw drive mechanism side output shaft 38 at one clutch plate 34 that rotates while rotating as a unit with the face plate 6. The other clutch plate 35 is provided opposite to the clutch plate 34 so as to be movable back and forth in the axial direction. The other clutch plate 35 is fixed to an output shaft 37 of a servo motor 36 provided on the base 2. The servo motor 36 is fixed to the headstock 4 and can output a rotation angle signal of its output shaft 37, and a known servo motor is used.

The clutch 34 and the bevel gear 33b are connected to each other,
A pinion 39 is coaxially fixed to the output shaft 38 on the jaw drive mechanism side that is integrally connected to the output shaft 37. A gear 40 meshing with the pinion 39 is provided integrally with the face plate 6 coaxially with the face plate 6. The pinion 39 meshes with the gear 40, and three bodies are provided at equal angular positions on the outer circumference.
Three sets of jaw drive mechanisms including the pinion 39, the bevel gear 33, the ball screw 31, and the moving body 32 coupled to each jaw 30 are provided. A wheel W is attached to the tip of the jaw 30.
The support claw 30 is provided for supporting the side surface of the.

(Operation of First Embodiment) Next, the operation of the first embodiment will be described. The rail width of the rails 11 and 12 is adjusted by moving the bases 2 and 3. Carry-in rail 11a,
One wheel axle having two left and right wheels is guided by 12a, guided by rails 11 and 12, carried in on a fixed position stop rail, and placed at a fixed position. The diameter of the wheel flange has been measured in advance. The limit switches 14 and 15 are lowered based on the measured value of the wheel flange diameter.

The wheel axle is lifted by the lifter 20,
At the position where the wheel axle comes into contact with the contacts of the limit switches 14 and 15 and the wheel axle stops rising, the center of the wheel axle coincides with the machine center. In this coincident state, the both ends of the wheel shaft are sandwiched and fixed by the support means (center) whose front end portion, which is not described, is tapered. The tread diameter and shape of the wheel W are measured by a measuring device not described in this fixed state.

In such a fixed state, the face plate 6 is rotated so that the clutch plate 34 and the clutch plate 35 face each other. When the clutch plate 34 and the clutch plate 35 are connected and the servomotor 36 is operated, the bevel gear 33 rotates together with the clutches 34 and 35, and the ball screw 31 rotates. The jaw 30 moves in the radial direction together with the ball nut 32 that moves by the rotation of the ball screw 31. The flange of the wheel W,
Based on the measured value of the tread, the supporting claw 30 of the jaw 30
The optimum position on the side surface of the wheel W to be gripped by a (the most outward position of the wheel W is generally optimum) is determined. The feeding of the jaw 30 to the optimum gripping position can also be performed visually. This feed is automatic feed based on the measured value.

When the servo motor 36 rotates, the gear 40 that meshes with the output shaft 38 on the jaw drive mechanism side and the pinion 39 that rotates as a unit rotates. The rotation of the gear 40 causes the three pinions 39 to rotate at the same time, and the other two sets of jaw driving mechanisms (31, 33, 39) operate to operate the three jaws 30.
Move simultaneously in the radial direction. The face plates 6 and 6 are advanced to the headstocks 4 and 5 and the one body in the directions opposite to each other. As described above, a total of six jaws 30 on the left and right sides are sandwiched from both sides at the optimum gripping positions of the wheels W on the left and right of the wheel axle. Thus, the wheel W is gripped at six points by the left and right six jaws 30.

The rotation speed of the servo motor 36 is the same as that of the jaw 30.
Since it is counted from the machine origin, the position of each jaw 30 is known from the count value relative to the cutting blade 50 of the tool rest which is also located from the machine origin. Moreover, since the shape of each jaw 30 is determined,
A forbidden area (not shown) or barrier is defined which the cutting blade 50 must not approach. In this intrusion-prohibited area, the NC device that receives the rotation angle signal output from the servo motor 36 calculates the coordinate position of the barrier. In this way, since the movement of the servo motor that drives the cutting blade 50 is controlled as the prohibition information that the coordinates of the barrier prohibit the movement of the cutting blade 50, interference between the cutting blade 50 and the jaw 30 is avoided. The tread surface of the wheel W which has been subjected to the correction processing is lowered by the lifter 20 and guided by the unloading rail to be carried out.

(Second Embodiment) FIG. 3 is a front view showing a second embodiment of the jaw driving mechanism. A pair of bevel gears 33, a ball screw 31, a ball nut 32, and a pinion 39 that is coupled to the bevel gear 33 are provided similarly to those in the first embodiment.
In the second embodiment, a ring gear 42 is slidably and rotatably fitted to a disc 46 which is coaxially attached to the face plate 6 and has a gear geared with the pinion 39 provided on the outer periphery thereof. On the inner peripheral surface of the ring gear 42, one tooth 43 is engraved. A second pinion 44 meshes with the teeth 43, and the second pinion 44 is fixed to the output shaft of a servomotor 45 fixed to the headstock 4.

In the jaw driving mechanism of the second embodiment, when the servo motor 45 rotates, the second pinion 44 rotates,
The ring gear 42 rotates, and further, the three pinions 39 meshing with the ring gear 42 around the ring gear 42 rotate, and the three jaws 30 move in the radial direction as in the first embodiment. According to the second embodiment, no clutch is required, and therefore the jaw 30 can be driven at any stop position of the face plate 6.

(Other Embodiments) The present invention is not limited to the above embodiments, and design changes are made within the scope of the gist of the present invention. For example, the measurement of the diameter of the target wheel is
It may be before or after being carried into the center of the machine. The forward and backward movement of the jaw in the wheel axis direction can be performed on the face plate instead of integrally with the headstock.

The output shaft of the servomotor is connected to the jaw drive mechanism at all times in the second embodiment and at the time of engaging the clutch in the first embodiment. However, in the first embodiment, if the servomotor is attached to the face plate, the clutch will move. The jaw drive mechanism and the servo motor can be always connected by omitting them. Further, although all the embodiments have been described with respect to the correction processing of the wheels, the present invention can be applied to a general-purpose NC lathe.

[0027]

According to the jaw driving device of the NC lathe of the present invention, the following effects can be obtained. Jaw drive automation can be performed. Further, according to the jaw driving device of the NC lathe of the present invention, the barrier creation can be automated.
It is possible to prevent a collision between the turret and the jaws. As described above, according to the present invention, it is possible to efficiently process workpieces having different shapes and dimensions.

[Brief description of drawings]

FIG. 1 is a front view showing a first embodiment of a jaw driving device for an NC lathe according to the present invention.

FIG. 2 is a front view showing a first embodiment of the jaw driving mechanism.

FIG. 3 is a front view showing a second embodiment of the jaw driving mechanism.

[Explanation of symbols]

 4, 5 ... Headstock 6 ... Face plate 30 ... Jaw 31 ... Ball screw (drive mechanism) 33 ... Bevel gear (drive mechanism) 34, 35 ... Clutch (drive mechanism) 36, 45 ... AC servo motor 38 ... Output shaft 39 ... Pinion (drive mechanism) 42 ... Ring gear (drive mechanism) 43 ... Teeth (drive mechanism) 44 ... Second pinion (drive mechanism)

Claims (2)

[Claims] 1. A face plate (6) rotatably attached to a headstock (4, 5), and the face plate (6) movably in a radial direction of the face plate (6).
And a jaw driving mechanism (31, 33, 39, 42, 43) provided on the face plate (6) for driving the jaw (30) in the radial direction of the face plate (6). , 44) and the jaw drive mechanism (31, 33, 39, 42, 43,
44) A jaw driving device for an NC lathe, which comprises a servomotor (36, 45) capable of outputting a rotation angle signal of an output shaft (38) coupled to the shaft 44). 2. The jaw drive device for an NC lathe according to claim 1, comprising an arithmetic processing unit for receiving the rotation angle signal of the servo motors (36, 45) and arithmetically processing the coordinates of the barrier. Characteristic NC lathe jaw drive device.