JPH0661644B2 - How to eject backside finished parts on automatic lathe - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Field of Industrial Application The present invention relates to a method for discharging a backside finished component in an automatic lathe.

(2) Disadvantages of the prior art As a method of discharging the back surface finishing finished parts in the conventional automatic lathe, a discharging shaft provided in the back surface processing main shaft hole finishes the rear surface processing each time the rear surface processing is completed, and the main shaft chuck is opened together with the main shaft hole. Similarly, there is a method of discharging the parts to the front of the main shaft chuck by injecting air from the injection nozzle provided in the back surface processing main shaft to the parts for which processing has been completed. However, all of them require a dedicated drive mechanism for discharging the parts, and the former one has the discharge shaft arranged in the rear surface processing main shaft hole, so that the rear surface inserted in the hole is formed. The length of the machined parts is limited, and the latter has the synergistic effect of purifying the inside of the main spindle by blowing out the chips entering the main spindle to the outside, but the one with a long length is It is difficult to discharge it to the air, and when the air is strengthened, oil and cutting chips scatter in a wide area forward, which may cause cutting chips to mix in the guide bush and fail to perform the function for pre-processing, as well as the automatic lathe. It is necessary to take care so that the oil does not scatter out of the main body, and short and light parts have various drawbacks such as the parts being damaged by colliding with other members by the ejection force.

(3) Object of the present invention The present invention relates to the above improvement, and the object is to:
It does not require a dedicated drive mechanism for ejecting back-side processed parts, and can be applied regardless of the size of processed parts,
It is an object of the present invention to provide a method that is particularly suitable for discharging long parts and that can discharge parts without damaging them.

(4) Outline of the Invention Then, according to the present invention, a component receiving member is arranged in a spindle hole for back surface machining in a stationary state in which rotation of the spindle is blocked, and the next pre-finished component is the main spindle. The object is achieved by the discharging method in which the back machining finished part remaining in the spindle is passed through the component receiving member by the pre-machining finished part through the grasping operation for gripping by It was done.

(5) Description of Examples Hereinafter, the present invention will be described with reference to Examples. FIG. 1 is a cross-sectional view mainly showing the back surface processing main spindle device of the present invention.
Reference numeral 1 denotes a pre-machining spindle device having a spindle mechanism and a chuck opening / closing mechanism. Sliding control of a spindle sliding table controls sliding movement of a work 3 supported by a guide bush 2 and at the same time, a workpiece of a tool rest. Pre-processing is performed by the engaging action with respect to. Reference numeral 5 denotes a back machining spindle device for taking out the pre-finished part cut by the parting bite 4 for back machining, and basically has the same configuration as the pre-machining spindle device. There is. Reference numeral 6 is a collet chuck for gripping a backside processed component, 7 is a collet chuck opening / closing sleeve, and 8 is a collet chuck opening / closing auxiliary sleeve for pressing the sleeve 7. And shifter 9
Of the chuck opening / closing claw 10 by swinging the chuck opening / closing claw 10 about the pin 11 as a fulcrum by controlling the reciprocating movement of the claw 10 in the main axis direction.
The collet chuck opening / closing sleeve 7 is reciprocally moved through the collet chuck opening / closing auxiliary sleeve 8 engaged with the collet chuck 6 to open / close the collet chuck 6. Reference numeral 12 denotes a backside processing main spindle, which is rotatably formed via bearings 15 and 16 provided in a quill 14 arranged on a main spindle slide 13. Reference numeral 17 denotes a component receiving holder arranged in the rear part of the spindle slide 13, and the rear surface finishing finished component is conveyed through the component receiving holder 17 with a gap in the collet chuck opening / closing assisting sleeve 8. A component receiving member 18 serving as a discharge guide is fixed. The component receiving member 18 is in a stationary state completely separated from the rotating members such as the collet chuck opening / closing auxiliary sleeve 8, the collet chuck opening / closing sleeve 7, and the chuck opening / closing pawl 10 which rotate integrally with the back surface processing spindle 12,
It is arranged so as to extend from the inside of the spindle hole to the outside hole. In the present embodiment, one end of the component receiving member 18 is an example in which it is extended to the vicinity of the rear end of the collet chuck 6, but in the case of a component shorter than the length of the component to be machined, the back surface inside the collet chuck is It may be further extended up to just before the workpiece gripping portion 6A, or the tip opening may be formed in a taper shape toward the opening so that the component can easily enter. In the above, the present invention having the above-described configuration will be described with reference to a method of discharging a back surface finishing component. When the pre-processing is completed on the side of the processing spindle device 1 as described above, the step of cutting the part by the cutting tool 4 is started. In the step, the spindle of the back machining spindle device 5 is concentrically opposed to the spindle of the pre-machining spindle device 1 by the sliding control of the spindle stock 13 and is rotated in synchronization with the pre-machining spindle. At, the pre-finished part to be cut is gripped. The cut pre-finished component is machined by the relative engagement between the main spindle slide 13 and the peripheral back machining blade and rotary tool. The main spindle slide base 13 for performing the back surface processing opposes the pre-processing main axis and slides in the main axis direction in order to perform the back surface processing of the component at least in the cutting step of the pre-processing finished component. The present invention utilizes the take-out operation of the next pre-finished part to push back the back-machined finished part in the collet chuck, which has already been machined, by the pre-finished part, and repeats these operations. The parts are sequentially discharged to the rear of the back surface processing main shaft through the component receiving member 18. That is, when the pre-finishing finished part take-out operation is performed by the forward sliding of the back-side machining main spindle device 5, the collet chuck of the main spindle device 5 shifts the back-finishing finished part before contacting the grasped back-finishing finished part with the shifter. 9 is moved to the left from the illustrated state, the chuck opening / closing claw 10 rotates counterclockwise about the pin 11 as a fulcrum, and at the same time, the chuck 6 and the collet chuck opening / closing sleeve 7 are moved.
A spindle slide base that is moved to the open state by moving the sleeve 7 to the right by following the return force of the spring 20 arranged between the sleeve receiver 19 and the spring receiver 19 By the forward sliding control of 13, the pre-finishing component is inserted and guided while pressing and moving the back-face finishing component to a predetermined position in the spindle hole, and at the same time, the shifter 9 is moved to the right. It is grasped by setting the state as shown in the figure. By this operation, the back-side processed finished part is pushed and moved rearward in the back-side processed spindle hole by the process-finished part and is conveyed to the part receiving member 18 side. It should be noted that, at the time of the operation for taking out the pre-finished parts by the drive control of the back surface machining spindle device 5, both the spindles may be synchronously rotated.
If relative positioning is required between the secondary machining of the part performed on the pre-finished part and the secondary machining performed on the back side, the spindle of the pre-finished part should be placed at the specified position. The cutting operation may be performed by the synchronous rotation of both spindles after gripping in a rotationally stationary state at, and is arbitrarily set according to the shape of the processed part. Further, the component receiving member 18 has an arbitrary cross-sectional shape depending on the cross-sectional shape of the workpiece to be used and the shape of the machined part. What is called a component receiving member that can be used in order to discharge the rear surface processed part to the rear of the main spindle sequentially without affecting the rotation of the main shaft when holding the front processed end part to the rear surface processed spindle. Is optional. Hereinafter, in each of the pre-finishing finished part gripping operations by the collet chuck 6 of the back-side finishing spindle device 5 in the pre-finishing finished part cutting step, the back-side finishing finished part is sequentially conveyed and discharged to the rear of the spindle with the part receiving member 18 as a guide. .

(6) Effects of the Present Invention As described above, according to the method for discharging a back surface finishing finished part of the present invention, the back surface finishing finished part is moved from the inside of the spindle hole to the outside of the spindle in a stationary state separated from the rotation of the back machining spindle. Through the guide pipe arranged to be extended, the cutting process of the pre-finished component for the next back machining, that is, the operation for taking out the component is used, and is inserted into the back machining spindle hole. Since the back-end processed parts remaining in the collet chuck are sequentially pressed and discharged to the rear side of the main spindle among the end-of-processed parts, a dedicated drive source for discharging without damaging the processed parts. In addition, it is possible to surely and smoothly perform the discharging operation of the processing-completed parts in the processing process for processing a series of parts without requiring the time for discharging the parts. Further, in particular, in the conventional example of discharging one by one to the front of the main shaft, the range of parts applicable to the mechanism is limited due to the relationship with the stroke of the discharge shaft, but in the discharging method of the present invention, There are various practical effects when there is no restriction and it is not necessary to secure a stroke for discharging between the front processing spindle side component member and the back processing spindle when discharging.

[Brief description of drawings]

FIG. 1 is a transverse cross-sectional view showing an embodiment for explaining a method for discharging back surface finished parts of a lathe according to the present invention. 1: Pre-machining spindle device, 5: Back machining spindle device 6: Collet chuck, 18: Component receiving member

Claims (1)

[Claims] 1. In an automatic lathe having a back surface processing function, a part receiving member extending from the inside of a back surface processing spindle hole having a built-in collet chuck for holding a pre-finished part to the outside is disposed in a stationary state. Through the headstock sliding action of gripping the next pre-finished part with the collet chuck for the back side machining, and the back side finished part before remaining in the collet chuck in the part receiving member. A rear surface processing end component discharging method, characterized in that the rear surface processing end component is discharged rearward through the component receiving member in a repeated operation of pressing and moving to the rear.