JPH02106253A - Automatic centering device for workpiece - Google Patents

Abstract

PURPOSE:To automatically carry out highly accurate centering efficiently without requiring labor by operating the numerical data of the outside diameter of a workpiece and the position measurement of a tail spindle with a computer and thereby carrying out correction between a main spindle side and an adjusting shaft provided on the adjusting table of a tail stock side by means of a pulse motor. CONSTITUTION:A tail spindle is opposed to a main spindle 5 having a pulse generator and connected to a hydraulic cylinder to clamp a workpiece while having an encoder for indicating a position. Further, a lifting up/down means pushes up the workpiece to a clamp position and a liftable measuring member 37 measures the outside diameter on both end portion sides of the workpiece. By arithmetically processing the numerical value data of angle information by this measuring member 37 and measured length by the encoder, etc., by means of software, the adjusting shaft 27 of an adjusting table 18 is operated by means of two pulse motors, thereby correcting the deviation of center to carry out automatic centering of a workpiece.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention automatically performs centering work of a workpiece such as cutting and grinding by calculating the outer diameter of the workpiece, data, and length measurement data. The present invention relates to an automatic workpiece centering device that corrects misalignment.

[Conventional technology and Problems that the invention attempts to solve]

In conventional methods such as cylindrical grinding, the centering of the workpiece changes depending on the shape of the workpiece, so the center has to be determined manually in most cases.

Therefore, the centering operation is particularly complicated and time-consuming, and is completely unmanageable, especially for irregularly shaped workpieces.

Moreover, it is labor-intensive and requires skilled technical ability.

[Means for solving problems]

The present invention was devised in order to eliminate these problems in view of the above-mentioned circumstances. It has a measuring stylus that measures the workpiece, a movement position encoder for the spindle, a tailstock shaft that presses and clamps the workpiece, and a length origin sensor. Relative movement in the vertical direction to correct misalignment of objects; III! A pulse motor is used as the power source for this correction, and numerical data such as angle information from the probe and length measurement from the encoder is transmitted to the software.
The machine is characterized in that the workpiece is automatically centered by performing calculation processing using the two pulse motors to correct misalignment, and automatically correcting misalignment based on the data. This is provided for the purpose of efficiently performing accurate centering without requiring much effort.

〔Example〕

Next, an embodiment of the automatic workpiece centering apparatus according to the present invention will be specifically described with respect to a grinding machine.

Reference numeral 1 denotes a machine body, which has a horizontal bed 2 on the machine body 1, a fixed headstock 3 at one end of the bed 2, and a fixed headstock 3 at the other end of the ped 2. A Shinshin board 4 is provided which is movable on the bed 2 and is clamped and fixed at any moved position.

A main spindle 5 is supported on one of the headstocks 3.

This is connected to the shaft 8 of the worm wheel 7 that meshes with the worm 6, and rotation is transmitted thereto. The worm foil 7 is provided in correspondence with an origin sensor 9 for detecting the origin position. In addition, the worm shaft 6a of the worm 6 has a pulley 1 on the same axis.
1, and a rotary plate 13 with a number of holes 12 formed on the same circumferential surface.

The pulley 11 is connected to an inverter-equipped motor 10 via a belt lla. The hole 12 formed in the rotary plate 13 is provided with a pulse generator 14 opposed to the hole 12 .

On the headstock 3 side, an adjustment table 18 is provided at the lower part of the headstock 3, one end of which is supported by a shaft 15, and the other end of which is provided with a roller 17 that is supported by a bearing 16. stand 18
is provided so as to enclose the headstock 3. Adjustment stand 1
The roller 17 at the end of 8 is connected to the opposing cam roller 19
The uke is stopped by contacting the top. The cam roller shaft 23 of the cam roller 19 is driven through a centering pulse motor 22 and a deceleration mechanism 21, each of which has a damper 20 at one end. The cam roller shaft 23 also has a recess 24 for detecting the centering origin.
The detection plate 24 is provided with a centering origin sensor 25 corresponding to the detection plate 24.

Further, the adjustment table 18 is equipped with a plurality of sets of grooved rollers 26, 26 arranged at intervals on both sides. The flange 27 of the adjustment shaft 27 is provided with the adjustment shaft 27 fitted with the
The support plate 28 attached to the grooved roller 26°2 from above and below
The adjustment shaft 27 is inserted so as to be clamped with the
is guided through the support plate 28 by grooved rollers 26 and 26 when moving forward and backward. Also, the flange 27a of the adjustment shaft 27
The tip of a rod 29a from a hydraulic cylinder 29 mounted on the adjustment table 18 is connected to the hydraulic cylinder 2.
9, the adjustment shaft 27 moves forward and backward.

A movable base 30 that moves on the bed 2 is disposed on the front side of the headstock 3, and the movable base 30 is connected to the headstock 3.
The tip of a rod 31a from a cylinder 31 attached to the side of the cylinder 31 is connected, and the cylinder 31 moves the rod 31a to a predetermined position.

The movable table 3o is provided with an elevating body 33 to which a receiving plate 32 provided with a V-shaped recess 32a on which the workpiece W is placed is attached so that the elevating body 33 can be moved up and down by an elevating means.

This elevating body 33 is designed to be positioned at 5 inches, 6 inches, and 8 inches corresponding to the basic diameter of the workpiece W. In addition, this elevating means is a cylinder 3 provided in the center.
4 and 1, the tip of the rod 34a from the cylinder 34 is connected to the elevating body 3:3, and the guide rods 35.35 are provided on both sides of the elevating body 33.
5 is inserted into guide holes 35a, 35a provided in the movable table 30, and guides the elevating body 33 when it is raised and lowered.

Furthermore, a measuring device 36 for measuring the outer circumference of the workpiece W is provided on the back side of the movable table 30. This measuring device 36 positions a bearing stylus 37 aligned with the center of the recess 32a of the receiving plate 32. The measuring element 37 is attached to a horizontal plate 40 on the operating shaft 39 inserted into a vertical hole 38 provided in the measuring device 36, and vertical insertion holes 41 are provided on both sides of the horizontal plate 40.
A guide rod 42 inserted with a spring 41a acting thereon is provided to constantly act on the measuring element 37 in the upward direction.6 A rack 39a is attached to the operating shaft 39, and this rack 39a meshes with the pinion 43. The encoder is actuated by the pinion 43, and the amount of movement in the vertical direction is read by the encoder with a source point and the counter is inputted to the control panel.

Next, the tailstock 4 side is constructed in the same manner as the headstock 3. That is, a tailstock shaft 44 that moves forward and backward is fitted into the tailstock board 4, and this tailstock shaft 44 is connected to a hydraulic cylinder 45, and a core is provided on the tailstock side for measuring the length in the direction in which the tailstock shaft enters and exits. A push position encoder and a length origin sensor are provided, and the hydraulic cylinder 45 moves the tailstock shaft 44 back and forth to press and hold the workpiece W between the main shaft 5.

The tailstock 4 is provided with an adjusting table 48 which has one end supported by a shaft 46 on the lower side and a roller 47 supported at the other end in the same way as the headstock 3 side. The push side adjustment table 48 is made swingable about the shaft 46.

The roller 47 is a cam roller 4 facing the roller 47.
It is received by touching 9. The cam roller 49 is provided with a damper 50 at one end in the same way as the headstock side, and is driven by a centering pulse motor 22 provided with a deceleration mechanism 51, and the shaft of this cam roller 49 has a recess 52a for detecting the origin. A detection plate 52 is provided, and an origin position sensor 53 corresponding to the detection plate 52 is provided for inputting information to a control panel.

Further, the adjustment table 48 on the tailstock 4 side is equipped with a plurality of sets of grooved rollers 54, 54 corresponding to both sides, and the grooved rollers 54, 54 have a space between them on the tip side of the tailstock shaft 44. The support plate 57, on which the flange 56a of the adjusting shaft 56 fitted thereon is mounted, is held and supported and guided. The flange 56a of the adjustment shaft 56 is connected to the hydraulic cylinder 5 mounted on the adjustment table 48.
The tips of the rods 57a from 7 are connected so that they can be moved by the operation of the hydraulic cylinder 57.

On the tailstock 4 side, the bed 2 is placed on the front side of the tailstock 4.
A second moving table 58 that moves above is arranged.

This second moving table is moved to a predetermined position by a rod from a cylinder.

Also, on the second moving table 58, like the headstock side, an elevating body 33 having a receiving plate 32 provided with a V-shaped recess 32a on which the workpiece W is placed can be raised and lowered by the same elevating means as on the headstock side. It is provided for.

Further, a measuring device 59 is provided on the back side of the second movable table 58. This measuring device 59 is the same as the measuring device 36 described above, and constantly pushes up a horizontal plate 4o provided with a measuring element 37 by applying a spring 41a acting on a guide rod 42. An operating shaft 39 is provided with a rack 39a attached thereto, and a pinion 43 is engaged with the rack 39a to operate an encoder via the pinion 43 above and below the operating shaft 39 for counter operation.

[For production]

As is clear from the above configuration, in performing centering, the present invention first returns everything to its initial state, turns on a signal that enables the workpiece to be accepted, and then inserts the workpiece into the recess of the receiving plate on the elevating body. Load the workpiece, raise the elevating body, move the tailstock shaft forward with the cylinder, output the tailstock position to the count using the encoder, input it to the control panel, and clamp it, then lower the elevating body, and then Afterwards, raise the probes respectively and place the workpiece W.
contact with. After that, turn on the rotation of the workpiece,
While the workpiece is being rotated once, the outer periphery or outer diameter of the workpiece is measured by the measuring head, and the outer diameter data is read for each pulse, and when this is completed, the rotation is turned off and the measuring head is lowered. After this, the read data is calculated by a microcomputer. This calculated adjustment amount is first used to center the headstock side. This is done by moving the cylinder on the adjustment table on the spindle side forward and making adjustments. After the shaft and main spindle change the workpiece, the adjustment shaft is moved vertically by a cam roller to correct misalignment on the headstock side.

When this correction is completed, the grip of the main spindle and the adjustment shaft is changed, and the workpiece is rotated to the angle origin. Next, the tailstock side angle is corrected in the same way as above, and when the centering misalignment on the tailstock side is corrected, the centering is completed. When the grinding is completely completed, the measuring head rises again, rotates the workpiece once, and measures it. If the measurement results indicate that centering has been completed, the process proceeds to the next grinding, and if centering has not yet been completed, The calculation is performed again from the measurement, and the above operation is repeated.

〔effect〕

As described above, the present invention includes a main shaft equipped with a pulse generator;
Lifting means for pushing up the workpiece to be clamped by a tailstock shaft corresponding to the main spindle to the clamping position, a movable measuring element for measuring the outer diameter of the end of the workpiece, and a signal indicating the position of the tailstock shaft. It has an encoder that outputs , and inputs the numerical data measured by these into the control panel and processes it to operate.
The two pulse motors are each installed on an adjustment table, and an adjustment shaft is provided to correct the misalignment of the workpiece. Numerical data is calculated by a computer, and based on this, the pulse motor is used to correct misalignment using adjustment axes provided on the adjustment tables on the spindle side and tailstock side.The correction operation of the adjustment axes automatically improves accuracy. This has the effect of allowing good centering to be performed efficiently without requiring much effort.

[Brief explanation of drawings]

The drawings show an embodiment of an automatic workpiece centering device according to the present invention, and FIG. 1 is a front view. Figure 2 is an enlarged front view with a section of the headstock side in Figure 1, Figure 3 is a left side view of Figure 2, and Figure 4 is a right side view with the inverter motor removed from Figure 2. , Fig. 5 is a partially sectional plan view of Fig. 2, Fig. 6 is an enlarged front view with a part of the centering board side stepped, Fig. 7 is a plan view of Fig. 6, Fig. 8 is the 6th
Figure 9 is the right side view of the figure, Figure 9 is the vertical front view of the measuring device, Figure 10 is
The figure is a perspective view showing power transmission from the inverter motor to the main shaft, and FIG. 11 is a flowchart of the operation. 1... Airframe 2... Bed 3... Headstock 4.
...Shinshinban 5...Main axis 6...Warm 6a・
... Worm shaft 7 ... Worm wheel 8 ... Axis 9 ... Origin sensor 1o ... Motor with inverter 11 ... Pulley 12 ... Hole 13 ... Rotating plate 14 ... Pulse generation Container 15, 46...Axis 1
6...Bearing 17°47...Roller 18,48・
...Adjustment stand 19°49...Cam roller 20.50
...Damper 21゜51...Reduction mechanism 22...
Pulse motor 23...Cam roller shaft 24, 52...
...Detection plate 24a. 52a... Concavity 25, 53... Origin sensor 2
6.54...Grooved roller 27,56...Adjustment shaft 2
7a, 56a...Flange 28...Support plate 29
．． 31, 34, 45.57... Hydraulic cylinder 29a,
31a, 34a, 57a... Rod 30.58...
Moving table 32... Receiving plate 33... Lifting plate 35...
・Guide rod 35a...Guide hole 36゜59...Inspection device 37...Measuring point 38...Vertical hole 39...Operating shaft 39a...Rack 40...Horizontal plate 41...・
Insertion hole 41z1...Spring 42...Guide rod 43...Pinion 44...Centering shaft 531 Figure y2 Figure 4 Procedure amendment (method) October 24, 1999 (2) Drawing ( Figure 11) shall be corrected as shown in the attached sheet. (No change in content) (3) Amend the power of attorney as shown in the attached sheet. (Indication of Case 1゜2゜3゜Patent Application No. 63-260990 Name of Invention Person Who Corrects Automatic Centering Device for Workpiece Relationship to Case Patent Applicant Ueda Giken Co., Ltd. 5゜6゜7゜Telephone 271-3751 (Representative) Date of amendment order: September 11, 1999 (Shipping address: September 26, 1999) Contents of the specification and drawings to be amended (Figure 11) and the amendment to the power of attorney

Claims (1)

[Claims] A main shaft equipped with a pulse generator and a tailstock shaft corresponding to the main shaft and connected to a hydraulic cylinder to clamp the workpiece and an encoder to indicate the position are provided, and the workpiece is pushed to the clamping position. A lifting means for raising and lowering the workpiece, a measuring element that can be raised and lowered to measure the outer diameter of both ends of the workpiece, and outputting the numerical values of the length and outer diameter, which are processed and adjusted by an adjustment shaft provided on the adjustment table. An automatic workpiece centering device characterized by being configured with two pulse motors that operate to correct misalignment.