JP2564184B2 - Longitudinal positioning method for workpiece and turning machine for positioned workpiece - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for longitudinally positioning a work such as a crankshaft and a turning machine for the positioned work.

[Conventional technology]

When using a machine tool such as a conventional finishing machine to finish-turn a long workpiece such as a crankshaft, or to perform roller burnishing (rolling pressure processing of turning marks generated in pre-processing), use both sides of the tool. Providing a positioning roll,
These positioning rolls are brought into contact with the work processing portion to position the work in the longitudinal direction (for example, Japanese Patent Application No.
59-138232 etc.).

[Problems to be Solved by the Invention]

However, in the above-described conventional positioning method using the positioning roll, if the pre-processing dimension is not uniform, the left and right machining allowances are not the same, so that it is not possible to perform highly accurate finish turning and it is not possible to control the longitudinal dimension based on the pre-processing dimension. There was a problem.

In addition, since the process from the positioning of the workpiece in the longitudinal direction to the chucking of the workpiece is complicated, the apparatus itself is expensive, and when the workpiece is chucked, the workpiece tends to bend and the machining accuracy is poor. .

The present invention has been made for the purpose of improving the above-mentioned problems, and a longitudinal positioning method for a work and a turning process for a positioned work that enable highly accurate finish turning by making the left and right machining allowances before the finish turning the same. It aims to provide a machine.

[Means and Actions for Solving the Problems]

In order to achieve the above object, the present invention provides a turning machine for longitudinally indexing a turning slide to a working portion of a pre-worked work and turning the working portion of the work by a working head provided on the turning slide. With the measuring head that is offset in the longitudinal indexing direction of the workpiece with respect to the machining head, measure the longitudinal dimension of the aerwork using a mask that has the same distance from the center between the machining sections of the workpiece to the machining section in advance. The index slide was moved by an absolute method to index to the turning position, and then the turning slide was moved forward to measure the longitudinal direction of the machined part and the amount of deviation of the center part of the machined part from the master was calculated and obtained. The deviation amount is fed back to the NC device to correct the indexing position of the indexing slide.

Further, it has a spindle head that supports one end of a work to be processed and that drives the work to rotate through a break, and a center that supports the other end of the work. To the tailstock that can be extruded into the workpiece, the indexing slide that is movable in the longitudinal direction of the workpiece, and the turning slide that has the machining head for machining the above-mentioned workpiece on the upper part, and the workpiece for the machining head. The measuring slide comprises a measuring slide which is offset in the longitudinal indexing direction and is arranged in parallel with the lathe turning slide, and which has a measuring head for measuring the pre-processing width dimension and the post-processing width dimension of the workpiece.

With the above configuration, even if there are variations in pre-processing dimensions, it is possible to accurately position the workpiece in the longitudinal direction so that the center between the processing parts during pre-processing and the center during finishing processing can be accurately aligned. The left and right machining allowances can be the same, which makes it possible to perform work such as balance cutting of workpieces with high precision.

In addition, by using the master, the measuring head can be provided offset from the machining head in the longitudinal indexing direction of the workpiece, and when machining the workpiece with the machining head, the measuring head is separated from the machining position. Since it is retracted to the open position, it is possible to prevent chips generated during processing from hitting the measuring head and damaging the measuring head or adhering to the measuring head.

〔Example〕

 An embodiment of the present invention will be described in detail with reference to the drawings.

In the figure, reference numeral 1 denotes a main body of a finishing turning machine such as a roller burnish finishing machine, in which a spindle head 2 and a tail stock 3 are installed at positions facing each other on a bed 1a.

The main spindle 4 rotatably supported by the main spindle head 2 is rotated via an endless belt 6 by a main spindle motor 5 mounted on the rear surface of the bed 1a, and the tip of the main spindle 4 is provided with a workpiece 7 to be finish-turned. Chuck 8 that supports one end
However, the tailstock 3 is provided with a center 9 for supporting the other end of the work 7.

As shown in FIGS. 3 and 4, the chuck 8 has a center that is biased toward the work 7 by a compression spring 10 at the center.
A workpiece temporary receiving member 12 for supporting the central portion of one end side of the workpiece 7 by this center 11 and for supporting the longitudinal positioning special workpiece 7 of the workpiece 7 from below is provided on the front surface of the chuck 8. Longitudinal reference blocks 13 that contact the front portion 7a of the work 7 and position the work 7 in the longitudinal direction are attached to the work temporary receiving member.
On both sides of 12, a tool 14 that projects the front portion 7a of the work 7 from both sides and rotates the work 7 is provided so as to project from the front surface of the chuck 8.

Further, as shown in FIG. 5, the center 9 provided on the tailstock 3 is provided with a work piece 7 by a longitudinal extrusion cylinder 15.
Has a sliding shaft 16 that can slide in any direction.
The key 16 is rotated by a key 17 inserted in the key groove 16a.

The center 9 is rotatably supported in the tip of the sliding shaft 16 via a bearing 18.

On the other hand, reference numeral 20 in the figure denotes a support member installed on the bed 1a, the upper surface of which is inclined forward and downward, and guide rails 21 laid on the upper surface and the rear surface of the support member 20 so as to be parallel to the axis of the work 7. The index slide 22 is installed on the top.

The indexing slide 22 is moved in the longitudinal direction of the work 7 by a feed screw 24 rotated by an indexing motor 23 so as to be indexed to a processing point of the work 7, and the indexing slide 22 is also mounted on the indexing slide 22. A guide rail 25 is laid in a direction orthogonal to the work 7, and a turning slide 26 is movably attached to the guide rail 25.

A machining head 28 having a tool 27 for lathe-turning the work 7 is installed on the turning slide 26, and is moved in the direction of the work 7 by a feed motor 29.

A measuring slide 30 is installed next to the turning slide 26.

As shown in FIG. 6 and FIG. 7, the measuring slide 30 is moved by the feed cylinder 31 along the guide rail 32 to the workpiece 7.
A measuring device that is movable in any direction and has a measuring head 33 provided at the tip, and this measuring head 33 contacts the workpiece 7 and measures the dimension from the center between the workpiece processing portions 7b to the left and right processing portions. 34 is installed.

Next, the operation will be described. First, the work 7 to be processed is carried in between the spindle head 2 and the tail stock 3 by using a conveying means such as a manipulator, and one end of the work 7 is supported by the work temporary receiving member 12. Longitudinal extrusion cylinder 15 in the state
The center 9 on the tailstock 3 side is extruded by using the front portion 7a of the work 7 as a longitudinal reference block on the front surface of the chuck 8.
Press to 13.

Next, when the indexing slide 21 is moved to index the absolute position for measurement and indexing, the measuring slide 30 is advanced to the work 7 side by the feed cylinder 31, and the longitudinal measurement of the machining part 7b before turning is performed as follows. To do.

That is, as shown in FIG.
Master 7'with the same distance from the center of 7b to the processed part 7b
After measuring the longitudinal dimension of the workpiece 7 using, move the index slide 20 to the index absolute dimension A and move the index slide 22.
Is indexed to the turning position, and then the turning slide 26 is moved forward to measure the longitudinal dimension of the processing portion 7b.

Then, the deviation amount B of the central portion of the processed portion 7b with respect to the master 7 ' The calculated deviation amount B is fed back to the NC device that controls the indexing of the indexing slide 20 to correct the indexing value.

As a result, the NC device indexes the turning position with the corrected value (absolute dimension A + deviation amount B), so that the center during the finishing turning process and the center of the pre-processing width dimension come to coincide with each other.

When the turning position has been indexed, the work 7 is rotated by the rotation of the main shaft 4 by the sticking projecting from the chuck 8, and the tool 27 attached to the processing head 28 is used for finish turning of the work processing portion 7b and roller burnishing. Finishing will be performed.

〔The invention's effect〕

In the present invention, as described in detail above, when the lengthwise dimension of the workpiece is measured in advance using a master in which the distance from the center of the workpiece to the processed portion is equal, the index slide is moved by the absolute dimension. Index to the turning position, and then the turning slide is moved forward to measure the longitudinal dimension of the machined part, calculate the amount of deviation of the center of the machined part from the master, and feed back the obtained amount of deviation to the NC unit. I tried to correct the index position of the index slide,
Even if there are variations in the pre-machining dimensions, the workpiece can be accurately positioned in the longitudinal direction so that the center of the pre-machining part and the center of the finishing part are aligned. Can be made the same, which makes it possible to perform work such as balance cutting of the work with high accuracy.

In addition, by using a master, the measuring head can be offset from the machining head in the longitudinal indexing direction of the workpiece, and when machining the workpiece with the machining head, the measuring head is separated from the machining position. Since it is retracted to a different position, chips generated during processing do not hit the measuring head and damage the measuring head or adhere to the measuring head.

As a result, it is possible to eliminate problems such as measurement being impossible, and measurement errors caused by adhering chips causing defective products, and the measuring head is offset from the machining head. As a result, the working head does not interfere with the work at the time of work, so that there are no problems such as impairing workability and impairing the safety of workers.

Furthermore, since the work is rotated by sharpening to perform the finishing process, there is no bending of the work that occurs when gripping the work unlike the one that was gripped by the conventional chuck. The process from the longitudinal positioning of the work to the support of the work can be simplified, and the cost of the apparatus itself can be reduced.

Moreover, it becomes possible to easily control the longitudinal dimension based on the distribution from the center of the pre-machined dimension.

[Brief description of drawings]

The drawings show one embodiment of the present invention. Fig. 1 is a plan view of a turning machine, Fig. 2 is a side view of the same, Fig. 3 is a sectional view of a spindle head, and Fig. 4 is a view from IV direction in Fig. 3. Fig. 5 is a cross-sectional view of the tailstock, Fig. 6 is a plan view of the measuring slide,
FIG. 7 is a side view of the same, and FIG. 8 is an operation explanatory view. 2 is the spindle head, 3 is the tailstock, 7 is the work, 7b
Is a processing section, 9 is a center, 14 is a shredder, 15 is a longitudinal extrusion cylinder, 22 is an indexing slide, 26 is a turning slide, 28 is a processing head, and 30 is a measuring slide.

Claims (2)

(57) [Claims] 1. A turning machine for longitudinally indexing a turning slide 26 on a working portion 7b of a pre-worked work 7 and turning a working portion 7b of a work 7 by a working head 28 provided on the turning slide 26. , A measuring head 33 which is offset with respect to the processing head 28 in the longitudinal sticking direction of the workpiece 7.
Thus, when the longitudinal dimension of the work 7 is measured in advance by using the master 7'in which the distance from the center of the work part to the work part is equal, the indexing slide 22 is moved by the indexing absolute method. After that, the turning slide 26 is moved forward to measure the longitudinal direction of the machining portion to calculate the deviation amount of the central portion of the machining portion with respect to the master 7 ′, and the obtained deviation amount is fed back to the NC device. A longitudinal positioning method for a work, which comprises correcting the indexing position of an indexing slide (22). 2. A spindle head 2 which supports one end of a work 7 to be machined and which drives the work 7 to rotate via a cleats 14.
And a tail stock 3 having a center 9 for supporting the other end of the work 7 and capable of extruding the center 9 in the direction of the spindle head 2 by a longitudinal extrusion cylinder 15, and a work 7
Turning slide 26 provided on an indexing slide 22 which is movable in the longitudinal direction of the workpiece, and a machining head 28 for machining the workpiece 7 provided on the upper part thereof, and longitudinal indexing of the workpiece 7 with respect to the machining head 28. A turning slide 26 which is offset in the direction and is provided in parallel with the turning slide 26, and which has a measuring head 30 having a measuring head 33 for measuring the pre-working width dimension and the post-working width dimension of the workpiece 7. machine.