JPH05245701A - Working process for long-sized workpiece - Google Patents

Abstract

PURPOSE:To provide an inexpensive and small-sized apparatus enabling large reduction in vibrations and flexures due to cut resistance and the like during mackining, high-precision/high-speed working, and remarkable shortening of a process time for intermittent operation and lead time. CONSTITUTION:Two headstocks 3 are disposed in a face-to-face relation on a coaxial line 6, beforehand. A long-sized workpiece 1 is supplied from the interior of a spindle 4 in one headstock 3, and this workpiece 1 is fed by a required length. Then, it is retained by a chuck, 5 of the other headstock 3, or its protruded portion is cut to a specified length and this protruded portion is fed back to the exterior of the spindle 4 from which the workpiece 1 is previously fed. Thereafter, the headstock 3 is moved in the axial direction, by which both ends of the cut workpiece 1 are retained by the chucks 5 of the headstocks 3. Then, the cut workpiece 1 is simultaneously machined by cutters 12 which oppose each other with the workpiece 1 intervening in between.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for precisely machining a long work such as a motor shaft or a long shaft.

[0002]

2. Description of the Related Art An example of a conventional method for processing a long workpiece will be specifically described with reference to an example of processing a motor shaft. FIG. 3 shows the processing steps. First, the long work material 1 is cut to a required length with a saw (see FIG. 3 (a)), and then a centering machine is used to perform center grinding on the left and right end faces (FIG. 3).
(See (b)), the workpiece is subjected to rotary cutting by chucking or Kelet drive on a lathe (see FIG. 3 (c)),
By changing the holding portion of the work, the opposite side of the work is similarly cut by the lathe (see FIG. 3D), and then the key groove is cut by the milling machine (see FIG. 3E). In this conventional method for machining long workpieces, many machine tools such as saws, centering machines, lathes, and milling machines are used for machining, so it takes time to set up and unload workpieces, and automation Even so, the lead time / tact time is long, and the production time per work piece is long. Further, since many machine tools are used, there are problems that the equipment cost is high and the installation floor area is large. Further, since the work is held and processed at one end thereof, there is a problem in that a long work causes bending and deflection due to cutting resistance and the like, resulting in poor processing accuracy.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to solve these problems of the conventional machining method, to reduce the influence of runout and deflection, and to perform high-speed machining with a small machining machine with high machining accuracy. It is to provide an excellent method for processing a long workpiece.

[0004]

Means for Solving the Problems The gist of the present invention which has solved the above problems is as follows: 1) A pair of opposed work rotating devices capable of holding a long work on the same axis hold the left and right ends of the work, and In addition, while simultaneously rotating the work holding part of each work rotation device in the same direction, at the same speed, and at the same phase, the above-mentioned work can be processed simultaneously with a plurality of blades from opposite directions. Method 2) A method for machining a long work piece according to claim 1, wherein an NC lathe having two headstocks facing each other is used as a work rotating device, and a chuck attached to the main spindle is used as a work holding portion 3) One or both A method of machining a long workpiece according to claim 2, wherein the headstock moves in the axial direction to load and unload the work. 4) Two headstocks are placed on a coaxial line so as to face each other. The work material was supplied from the inside of the spindle of one headstock, fed out the required length and held by the chuck of the other headstock, or the work material was supplied after cutting the protruding part of the work material to the required length. After returning to the outside of the spindle, move the spindle stock in the axial direction and hold the cut work end with the chuck of the spindle stock supplied with the material, then sandwich the work pieces and perform simultaneous machining with opposing blades. There is a method for machining long workpieces.

[0005]

In the present invention, the work holds both ends of the work by the opposite work rotating devices, and the work holding devices rotate the work holding portions in the same rotation direction, the same speed, and the same phase in synchronization. As a result, the work is supported while being processed at both ends, and bending and vibration of the work can be greatly suppressed. Since the work is rotated at the same speed and the same phase, the work is not twisted.
In addition, since multiple blades are used at the same time, facing each other across the workpiece to process, the pressing force and cutting resistance from the blade are offset, and the bending and vibration of the workpiece due to cutting resistance can be greatly reduced. it can. As a result, it is possible to process the work with an accuracy of a micron unit. In particular, when an accessory device that moves and supplies the work material from the inside of the main spindle of the lathe is added, the work material can be continuously supplied, and cutting, lathe machining and grooving with the required length are also performed. Since it can be done with blades placed opposite to each other, it is possible to perform from the material supply to the completion of processing with a single lathe, which is inexpensive and can perform high-speed processing.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. This embodiment is an example in which a work of a motor shaft is machined by one lathe. The lathe of this embodiment is composed of a pair of headstocks, which are work rotating devices, two tool rests, and their accessory devices / circuits. Become. The work material is fed from the inside of the spindle of one headstock. 1 is an explanatory view of a lathe according to an embodiment, FIG.
FIG. 3 is an explanatory view showing a working process of the embodiment, and FIG. 3 is an explanatory view showing a process of a conventional long working method. In the figure, 1 is a work material, 2 is a work having a diameter of 20 mm and a length of 200 mm, 3
Is a headstock which is a work rotating device, 4 is a headstock of the same headstock,
5 is a chuck which is a work holding part of the headstock 3, 6 is an axis of the left and right headstocks 3, 7 is an encoder for detecting the rotational speed and position of the main spindle 4, 8 is a drive motor controller for the main spindle 4 of the headstock 3. , 9 are synchronizing circuits for synchronizing so that the rotational speeds of the left and right main shafts 4 are in phase with each other, and 10 and 11 are axis lines 6.
Direction and a direction perpendicular to it, 12 is a tool attached to the tool rest 11, 13 is a stebos machined at the tip of the work material 1, 14 is a parting part of the work 2, 15 is for discharging the work It is an out feeder.

In this embodiment, first, a long work material 1
Is sent from the inside of the spindle 4 of one of the headstocks 3 so as to slightly project from the chuck 5 (see FIG. 2A). Next, the protruding portion is held by the chuck 5, and the work for forming the tip end portion of the work and the step portion 13 is performed using the blade 12 (see FIG. 2B). After that, the work material 1 is sent,
The step 5 is gripped by the chuck 5 of the other headstock 3 rotating at the same speed and the same phase. With both ends of the work material (workpiece) held by the chucks 5, the spindles 4 of the left and right spindle stocks 3 are rotated at the same speed and the same phase, and the tool post 11 is moved to perform simultaneous machining by the tool 12. After processing, the parting portion 14 of the work is cut off (see FIG. 2D). After that, the work material 1 is further fed to cut off the cut-off portion 14 on the chuck 5 of the headstock on the work supply side (see FIG. 2 (e)). After that, the chuck is opened and the work 2 is pulled out by the out feeder 15 to complete the processing of one work.

As described above, since the work is processed by the opposing blades 12 while both ends of the work are held by the chucks, the work can be performed with high accuracy and less deflection and bending. Further, since the work material is sent out from the spindle and necessary parts are processed / cut off to continuously process and manufacture the work, higher speed processing can be performed.

In the present invention, the work is not held at both ends,
A process including a process of holding only one, a process of using only one blade, and a process of combining different workpieces in which two headstocks are independent is also within the scope of the present invention. is there. As a result, more efficient processing can be appropriately performed for each work.

[0010]

As described above, according to the present invention, both ends of the work are held by the work rotating device, are rotated so as to have the same direction, the same speed, and the same phase, and are simultaneously processed by the opposing blades. By doing so, the work can be processed with extremely high accuracy with little bending and deflection. Moreover, since the processing can be completed with about one lathe, the equipment cost and the installation area can be reduced. Further, the processing speed can be greatly improved, the lead time and floor area can be reduced to about 1/10 of the conventional one, and the tact time and equipment cost can be reduced to about 1/2 to 1/3.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a lathe according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a processing process according to an embodiment of the present invention.

FIG. 3 is an explanatory view showing steps of a conventional long processing method.

[Explanation of symbols]

 1 Work Material 2 Work 3 Spindle Stock 4 Spindle 5 Chuck 6 Axis 7 Encoder 8 Drive Motor Controller 9 Synchronous Circuit 10 Tool Post 11 Tool Post 12 Cutlery 13 Stevos 14 Cut Off Part 15 Out Feeder

Claims (4)

[Claims] 1. A pair of opposing work rotating devices capable of holding a long work on the same axis hold the left and right ends of the work, and then the work holding portions of the respective work rotating devices have the same direction, the same speed and the same. A method for processing a long work, wherein the work is simultaneously processed by a plurality of blades from opposite directions while rotating synchronously with a phase. 2. The method for machining a long work piece according to claim 1, wherein an NC lathe having two opposed headstocks is used as a work rotating device, and a chuck attached to the main spindle serves as a work holding portion. 3. A method for machining a long work piece according to claim 2, wherein one or both headstocks are moved in the axial direction to load / unload the work pieces. 4. Two head stocks are placed on a coaxial line in a pair, and a long work material is supplied from the inside of one of the head stocks, sent out by a required length and held by a chuck of the other head stock, Alternatively, after cutting the protruding part of the work material to the required length, return it to the outside of the spindle that supplied the work material,
Machining method for long workpieces, characterized in that after moving the headstock in the axial direction and holding the cut work end by the chuck of the headstock supplied with the material, the work pieces are sandwiched and simultaneously processed by the opposing blades. ..