JPH05192801A - Automatic bar member machining nc lathe and machining method therof - Google Patents

Abstract

PURPOSE:To provide an automatic bar machining NC lathe and its machining method which is capable of detecting the length of a bar and of performing adequate operations in response to the detected length of the bar. CONSTITUTION:An automatic bar machining NC lathe consists of a NC lathe having a first main spindle and a second main spindle which are located opposite to each other to cooperatively machine a product, and a bar supply device for supplying bars to the NC lathe. Besides, a first position detecting means (LSA) for detecting the most forward position of a feed arrow for advancing the bar, a second position detecting means (LAB) which is located in the rear of the first position detecting means (LSA) to detect the position of the feed arrow at which the length of the bar reaches a first specified length, and a third position detecting means (LAC) which is located behind the first position detecting means (LSA) by a second specified length, are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic bar processing apparatus, and more specifically, it is provided with a first main spindle and a second main spindle which are opposed to each other, and one main surface is formed by using these main spindles. NC lathe that performs turning on both the front and back sides of
The present invention relates to an automatic NC lathe for machining a bar, which has a bar feeder equipped with a feed arrow that advances and feeds a bar to the NC lathe by a predetermined machining length.

[0002]

2. Description of the Related Art There is known an NC lathe for machining a bar material which is machined according to a predetermined machining program. This type of lathe grips a bar with a collet chuck on the main shaft,
It is configured to cut a bar that is rotated by the spindle with a cutting tool, such as a cutting tool, that is arranged in front of the spindle. In addition, two opposing main axes, namely,
A so-called facing spindle type NC lathe having a first spindle and a second spindle, and by appropriately using these spindles, it is possible to perform cutting processing on one product from the back side as well. Proposed (for example, Japanese Patent Laid-Open No. Hei 2)
232102).

Such an NC lathe for processing a bar material is used in combination with an automatic bar material feeder to automatically supply and replace the bar material to continuously manufacture a large number of products. can do. In such an NC lathe for bar processing, when processing with one bar is completed,
A bar material that has been shortened to a length that can no longer be processed, that is, a residual material is generated. This remaining material is discharged to create a new bar (new material).
To supply the residual material, take the residual material back to the bar feeder and use the residual material discharge mechanism of the bar feeder to discharge the residual material. The method of extruding to the front and ejecting to the front of the spindle has been conventionally used.

[0004]

However, if the method of always returning the residual material to the bar feeder and discharging it using the residual material discharge mechanism of the bar feeder, the length of the product is relatively short. Thus, even if one or more products can be processed, they will be discharged as a residual material, and the bar material cannot be effectively used.

On the other hand, if the residual material is always pushed forward by the tip of the new material and discharged to the front of the main spindle, when the residual material is long, another product cannot be processed, but the discharge portion in front of the main spindle. If the length becomes longer than that, the residual material may not be carried out. The present invention has been made in view of the above point, and an object thereof is to determine the length of the bar in the final processing step of the bar with a simple configuration, that is, in the final step of processing a product from the bar. It is an object of the present invention to provide an NC lathe for automatic bar machining and a machining method therefor capable of detecting an error and performing an appropriate operation accordingly.

[0006]

In order to achieve the above object, according to the present invention, it has a first main spindle and a second main spindle which are opposed to each other, and the first main spindle and the second main spindle jointly cooperate with each other. N for automatic bar material processing, which has an NC lathe capable of processing one product and a bar material supplying device for supplying a bar material to the NC lathe.
In the C lathe, a first position detecting means (LSA) for detecting the most advanced position of the feed arrow for advancing the bar, and a long position of the bar located behind the first position detecting means (LSA). And a second position detecting means (LSB) for detecting the position of the feed arrow having a first predetermined length, and a second predetermined length behind the first position detecting means (LSA). An NC lathe for machining an automatic bar material is provided, which has a third position detecting means (LSC).

Further, the first position detecting means (LSA) is a fixed position, and the second position detecting means (LSB) and the third position detecting means (LSC) can be integrally adjusted. preferable. Further, the first predetermined length is the minimum length capable of processing one product including the supporting margin by the guide bush, and the second predetermined length is the product 1 including the cutoff margin.
It is preferable that the length is individual.

Further, according to the present invention, an NC lathe having a first main spindle and a second main spindle facing each other and capable of processing with each of the first main spindle and the second main spindle, and a bar material for the NC lathe. For supplying the bar material, and in the bar material supplying apparatus, the first, in order from the front, which detects the position of the feed arrow of the bar material supplying device,
Second and third position detecting means (LSA, LSB, LSC)
In the processing method using the NC lathe for processing an automatic bar having the above, the third position detecting means (LSC) is turned on, and the second position detecting means (LSB) is turned on by the end of the processing of the product.
If is not ON, the bar is pulled out by the second spindle to further machine one or more products, and the remaining material after processing is a new material and is pushed out from the guide bush. When the second position detecting means (LSB) is turned on, after the processing is completed, the second operation of pulling out the residual material with the feed arrow and exchanging it with a new material is performed, and the second position is completed by the processing completion of the product. A machining method by an NC lathe for automatic bar machining, characterized in that when both the detection means (LSB) and the first position detection means (LSA) are turned on, a third operation for interrupting the machining is performed. Will be provided.

Further, the first position detecting means detects the most advanced position of the feed arrow, and the second position detecting means detects that the length of the bar has reached the first predetermined length. And is preferable. Further, the first predetermined length is the minimum length that can process one product including the supporting margin by the guide bush, and the second predetermined length is the length of one product including the cutoff margin. Preferably.

[0010]

According to the above configuration of the present invention, when the third position detecting means (LSC) is turned on, a final step of processing a product from the residual material (hereinafter referred to as a final processing stage) is started. In the final processing stage, when the second position detecting means (LSB) for detecting the second position of the feed arrow is not turned on during the processing of one product, the bar is pulled out by the second spindle and further 1 When one or more products are machined and the remaining material that has been machined is the new material, the first operation is performed to push it out from the guide bush, and when the second position detection means (LSB) is turned on, the machining is completed. A second operation of pulling out the remaining material by the backward feed arrow and replacing it with a new material is performed, and the second position detecting means (L
When both SB) and the first position detecting means (LSA) are turned on, the third operation for interrupting the processing is performed.

Thus, N for automatic bar material processing according to the present invention
With the C-lathe and its processing method, it is possible to detect the length of the rod at the final processing stage of the rod with a simple configuration and perform an appropriate operation according to this. Further, in a preferred aspect of the present invention, the second position of the feed arrow is a position when the remaining length of the bar is less than the processable length of one product including the cutoff margin. The second operation is an operation of finishing the processing, pulling out the remaining material with the feed arrow, and replacing it with a new material. As a result, the final product 1
When the second position detecting means (LSB) is not turned on during the processing of the book, the length of the remaining material is the product 1 including the cut-off allowance.
It is judged that the length is longer than the workable length of the book, the bar is pulled out by the second main spindle to further process one product, and the remaining material is pushed out from the guide bush by a new material and discharged. On the contrary, when the second position detecting means (LSB) is turned on, it is determined that the length of the residual material is less than the processable length of the product including the cutoff margin, and the processing is interrupted. , Use the feed arrow to pull out the remaining material and replace it with a new material.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of an NC lathe for automatic bar machining according to the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is a schematic plan view showing an overall configuration of an NC lathe for automatic bar material processing according to an embodiment of the present invention.
[Fig. 4] is a vertical cross-sectional view around a position detecting means provided in a bar feeder.

As shown in FIG. 1, an automatic bar lathe NC lathe 1 is composed of a bar feeder 10 and an NC lathe 20 arranged concentrically with each other along a bar axis XX. ing. The bar feeder 10 includes a frame 11 supported by a stand (not shown), and a feed arrow 13 which is reciprocally guided along a machining axis XX. A finger chuck 14 for gripping the rear end of the bar W is rotatably attached to the tip of the feed arrow 13, and the bar W gripped by the finger chuck 14 moves forward (right in the figure). (Movement in the direction), and is supplied to the NC lathe 20.

The bar material feeder 10 comprises a new material feeding device and a feed arrow moving device, which are not shown. The new material feeder is
A plurality of bar stocks are stored, and a bar stock to be newly processed, that is, a new stock bar is loaded in front of the feed arrow 13 (on the right side in the figure) according to the operation of the bar stock feeder 10. Also, the feed arrow moving device is
By providing the endless chain 12 (only a part of which is shown) locked to the feed arrow 13 and transmitting the power of the electric motor (not shown) to the feed arrow 13 via the endless chain 12,
A propulsive force toward the NC lathe 20 is applied to the feed arrow 13. A stopper 19 is provided at the front end portion of the frame 11, and the stopper 19 moves at a position where the feed arrow 13 can advance most without interfering with a chuck or the like in the spindle, that is, when it reaches the foremost end position. The forward movement of the feed arrow 13 is prevented.

Further, in the bar material feeder 10, the feed arrow 13 is 1
A remaining material discharge device for pulling the remaining material W into the bar material feeder 10 while gripping the remaining material W, that is, the residual material W after the completion of the processing with the bar material of the book, and removing the residual material W from the finger chuck 14 ( (Not shown). The residual material discharging device includes a residual material clamping device that grips and releases the bar W, and a residual material receiver that receives the residual material released from the residual material clamping device. Since the specific structure of this type of residual material discharging device is already known, detailed description thereof will be omitted.

The bar feeder 10 also has a first position detecting means for detecting the most advanced position of the feed arrow for advancing the bar, that is, a first sensor LSA, and a position behind the first sensor LSA. The second detecting the position of the feed arrow when the residual material length of the material is the first predetermined length, for example, the minimum length including the supporting margin by the guide bush capable of processing one product including the cut-off margin. Position detecting means, that is, a second sensor LSB,
It is located further behind the second sensor LSB, and the first sensor LS
A third position detecting means, that is, a third sensor LSC, is provided behind A by a second predetermined length, for example, the length of one product including a parting margin.

The first or second predetermined length is not limited to a bar length for processing one product when the product is short, and two or three products are processed. However, it is also possible to process the two or three products. Therefore, the position of the second sensor LSB is such that the remaining length of the bar material can process one product including the cut-off allowance (including the support allowance of the guide bush described later).
However, if the length of the product is short, it may be a length for processing two or three products. It is desirable that the position of the third sensor LSC substantially coincides with the length of the first sensor LSA capable of processing one product. However, when the length of the product is short, the LSB and the third sensor The distance from the LSC is the distance between the most advanced position of the forward end of the feed arrow and the limit of the rear end position of the bar that allows the bar to be supported by the guide bush.

Therefore, the first sensor LSA is a fixed position, the second sensor LSB and the third sensor LSC can be integrally adjusted, and the scale corresponding to the length of the product is located at the position of the third sensor LSC. Is preferably provided. This facilitates the position adjustment of the second sensor LSB and the third sensor LSC. The first to third sensors LSA, LSB,
Each of the LSCs is composed of a proximity switch or a similar sensor that is turned on by an LS dog that moves integrally with the feed arrow 13 as described later. Each sensor LSA, L
The detection signals of SB and LSC are transmitted to the controller C, and the controller C detects these sensors LSA and LS.
B, LSC, a rear end position detection sensor (not shown) for detecting the rear end position of the feed arrow 13, and a residual material discharge sensor (not shown) for detecting discharge of the residual material by the residual material discharging device. Based on the detection results of various sensors, the bar feeder 1
0 and controls the operation of the NC lathe 20.

As shown in FIG. 2, the first to third sensors L
SA, LSB and LSC are arranged in parallel to the machining axis X-X, the second and third sensors LSB and LSC are fixed to a common support member 32 by screws or bolts 31, and the support member 32 is a clamp. The screw 33 positions and fixes the bracket 18 protruding upward from the frame 11. The bracket 18 extends in the longitudinal direction of the frame 11, and by loosening the clamp screw 33 and moving the second and third sensors LSB and LSC along the bracket 18, the second and third sensors LSB and LSC.
The position of can be changed appropriately. First sensor LSA
Are fixed with a similar structure.

First to third sensors LSA, LSB, LS
An LS dog 16 that operates C is attached to a dog support plate 15 that projects laterally from the feed arrow 13. The dog support plate 15 extends laterally beyond the edge inclined surface of the guide 17 for guiding the feed arrow 13 along the machining axis X-X, and slides on the inclined surface while the feed arrow 1 extends.
Moved with 3.

Referring again to FIG. 1, the NC lathe 20 is
A movable first spindle 21 equipped with a collet chuck 22,
A guide bush 23 arranged in front of the first spindle 21 (right side in the drawing), a cutting tool such as a cutting tool 24 arranged in front of the guide bush 23, and a collet chuck 26 are provided to face the first spindle 21. It has a movable second spindle 25. The first main shaft 21, the guide bush 23, and the second main shaft 25 are arranged concentrically on the machining axis XX. As the cutting tool for the second spindle 25, another cutting tool other than the cutting tool 24 may be provided.

The first main spindle 21 is constructed so that the collet chuck 22 grips the bar W and moves the bar W in the front-rear direction along the machining axis XX while rotating the bar W. The guide bush 23 slidably contacts the outer peripheral surface of the bar W, rotatably supports the bar W, and guides the bar W along the machining axis XX. The second spindle 25 is also configured such that the collet chuck 26 holds the tip end portion of the bar W and can move the bar W in the front-back direction along the machining axis XX while rotating the bar W.

Further, the cutting tool 24 is laterally oriented toward the machining axis X-X or away from the machining axis (FIG. 1).
Then, the outer periphery of the front side (first main spindle 21) or the rear side (second main spindle 25) of the rotating bar W is turned. In order to control such a cutting operation, the NC lathe 20 is provided with an NC control device 27, and the NC control device 27, based on a machining program inputted in advance, each spindle 21, 25 and bite of the NC lathe 20. Controls the operation of a tool holder (not shown) holding 24.

FIG. 3 is a sequence diagram showing a control mode of control executed by the controller C in the final processing stage of the bar W. Further, FIGS. 4 and 5 are explanatory views showing stepwise a machining feed step and a turning step in the final machining step of the bar W. With reference to these drawings, a controlled mode of the NC lathe 1 for automatic bar material processing and an operating mode associated therewith will be described.

FIG. 4A shows a normal processing state, where L
The S dog 16 is located behind the third sensor LSC, and the sequence of the final step (final processing stage) for processing the product from the bar shown in FIG. 3 has not yet started. NC at this stage
In the lathe 20, for example, the bar W is processed by the first main shaft 21, and at the same time, the back surface of the product which has already been cut off is processed by the second main shaft 25.

Next, a plurality of products are processed and L
When the S dog 16 moves forward and the third sensor LSC is turned on, the final processing stage is entered and the sequence shown in FIG. 3 is started. At the final processing stage, the collet chuck 26 of the second spindle 25 grips the bar material W and cuts it off (S
1) is performed and the product is cut (see FIG. 3, FIG. 4B, and FIG. 5A) to finish the processing on the front surface side of the product.

Whether or not the second sensor LSB is turned on in this cut-off process (at the end of processing of the product) (S2)
Thus, another sequence shown in FIGS. 4 and 5 is performed.
When the second sensor LSB is still in the OFF state, that is,
As shown in FIG. 4B, when the LS dog 16 is located between the third sensor LSC and the second sensor LSB,
As shown in D, the front surface of the bar material W is processed, while the front product, which has already been cut in parallel, is processed by the second spindle 25 for the back surface. Next, as shown in FIG. 4E, the bar W is pulled forward by the second main shaft 25 (S3).

As shown in FIG. 4F, when the first sensor LSA is turned on (S4) by the LS dog 16, the residual material W is reduced to N.
While leaving it on the C lathe 20, as shown in FIG.
3 is retracted (S7), a new material supply device (not shown) is activated, and a bar material to be newly processed, that is, a new material is fed in front of the feed arrow 13 (S8). On the other hand, the bar W is processed by the second spindle 25 in parallel. In the final cut-off step (FIG. 4H), the residual material is left in the guide bush 23, and the product is cut off (S5). The product is cut off in FIG. It When the product processing in the final processing stage is completed, the feed arrow 13 is advanced to advance the new material to the shortcut position (S9) and the NC lathe 2 for cutting the front end portion of the new material.
Shortcut operation is performed by 0 (S10, FIG. 4).
I). When the new material moves forward to the shortcut position, NC
The residual material left on the guide bush 23 of the lathe 20 is pushed by the new material and discharged to the front of the guide bush 23. When this is completed, the controller C ends this control,
The process shifts to the control of a general processing step of the bar W.

On the other hand, when the first sensor LSA is not turned on after the bar W is pulled out (S4), the controller C
Judges that the length of the bar W is longer than a predetermined length, and therefore a bar having an excessively long bar length still remains, and issues an alarm (S11). This is to warn that the situation where the third sensor LSC is not properly set and the remaining material is too long to be ejected ahead of the guide bush 23 may be avoided, and the inability to eject the residual material is avoided. Provide the user with the opportunity to do so. After the alarm, it is preferable to stop the machine if the user takes no action.

On the other hand, as shown in FIG. 5A, when the parting process of the bar W by the cutting tool 24 is completed (S1), the second
When the sensor LSB is ON (S2), another sequence shown in FIG. 5 is performed. As shown in FIG. 5A, when the LS dog 16 of the feed arrow 13 exceeds the second sensor LSB, but is still at a position where it does not reach the first sensor LSA (S12), that is, the second sensor LSB is turned on. However, when the first sensor LSA is not turned on, the controller C determines that the bar length of the bar W is already long enough for the NC lathe 20 to process one product.
As shown in FIG. 5B, the feed arrow 1 is held with the bar W being held.
3 is retracted (S13), and the bar W is brought back to the bar feeder 10 by the feed arrow 13. Therefore, the bar feeder 1
When 0 is set, the bar W that is too short is prevented from being supplied to the NC lathe 20, the bar W is smoothly discharged, and a new material machining process can be swiftly performed.

When the third sensor LSC cannot be mounted at a desired position because the product is very long, the third sensor LSC is moved forward and mounted, and the first sensor LSA is mounted.
When turning ON, the machining is interrupted, the cutting tool 24 is retracted, the feed arrow 13 is retracted while the bar W is gripped (S13), and the bar W is brought back to the bar feeder 10 by the feed arrow 13. .. As a result, the bar material feeder 10 prevents the bar material W that is too short from being supplied to the NC lathe 20, and prevents the bar material WW from slipping out of the finger chuck 14 and becoming unable to supply the bar material. can do.

On the other hand, when the second sensor LSB is turned on and the first sensor LSA is also turned on (S12), the machining is interrupted and an alarm is issued (S14). In this situation,
For example, the mounting position of the first sensor LSA is defective, or
This may be caused by a malfunction of the bar stopping mechanism that prevents the bar W from advancing. After the alarm, it is preferable to stop the machine if the user takes no action.

As described above, according to the present invention, when the third sensor LSC is turned on, the final step of processing the product from the bar (hereinafter referred to as the final processing stage) is started. When the second sensor LSB that detects the second position of the feed arrow does not turn on during the processing of one product in the final processing stage, pull out the bar with the second spindle and add one or more. The product is processed, and the remaining material that has been processed is a new material and is pushed out from the guide bush. The first operation is performed, and when the second position detection means (LSB) is turned on, use the feed arrow after processing. Perform the second operation of pulling out the remaining material and replacing it with new material,
Second position detection means (LSB) by the end of processing of the product
When both the first position detecting means (LSA) and the first position detecting means (LSA) are turned on, the third operation for interrupting the processing is performed.

Although the preferred embodiments of the present invention have been described in detail above, the present invention is not limited to the above embodiments, and various modifications and changes can be made within the scope of the invention described in the claims. Needless to say, these are also included in the scope of the present invention. For example, each of the first to third sensors LSA, LSB, and LSC is composed of a proximity switch.
It may be composed of various position detectors such as limit switches and photoelectric sensors.

[0035]

According to the above configuration of the present invention, the automatic bar processing capable of detecting the length of the bar in the final processing stage of the bar with a simple structure and performing an appropriate operation according to the detected length. It becomes possible to provide an NC lathe for use.

[Brief description of drawings]

FIG. 1 is a schematic plan view showing an overall configuration of an NC lathe for automatic bar material processing according to an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view around a position sensor provided in a bar feeder.

FIG. 3 is a sequence diagram showing a control mode of control executed by a controller in a final processing stage of a bar W.

4A and 4B are explanatory views showing stepwise a machining feed step and a turning step in a final machining step of a bar W.

FIG. 5 is another explanatory diagram showing stepwise a machining feed step and a turning step in the final machining step of the bar W.

[Explanation of symbols]

 1 NC Lathe for Automatic Bar Machining 10 Bar Material Feeder 13 Feed Arrow 14 Finger Chuck 20 NC Lathe LSA 1st Sensor LSB 2nd Sensor LSC 3rd Sensor C Controller W Bar

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shinsuke Kasahara 840 Shimotomi, Tokorozawa-shi, Saitama Citizen Watch Co., Ltd. Tokorozawa Office (72) Inventor Minoru Uchibori 840 Shimotomi, Tokorozawa, Saitama Citizen Watch Co., Ltd. Tokorozawa Business In-house (72) Inventor Soichi Nakatani 840 Shimotomi, Tokorozawa, Saitama Prefecture Citizen Watch Co., Ltd. Tokorozawa Office

Claims (6)

[Claims] 1. An NC lathe that has a first spindle and a second spindle that face each other, and is capable of processing one product in cooperation with each of the first spindle and the second spindle, and to the NC lathe. In an automatic lathe machining NC lathe having a rod feeding device for feeding a rod, first position detecting means (LSA) for detecting a most advanced position of a feed arrow for advancing the rod, and the first lathe Second position detecting means (LSB) located behind the position detecting means (LSA) and detecting the position of the feed arrow in which the length of the bar member becomes a first predetermined length; and the first position detecting means. An automatic lathe NC lathe for machining a bar, comprising: a third position detecting means (LSC) located behind the means (LSA) by a second predetermined length. 2. The first position detecting means (LSA) is a fixed position, and the second position detecting means (LSB) and the third position detecting means (LSC) are integrally adjustable. NC lathe for automatic bar processing according to 1. 3. The first predetermined length is the minimum length capable of processing one product including the supporting margin by the guide bush,
The NC lathe for automatic bar material machining according to claim 1, wherein the second predetermined length is a length of one product including a parting margin. 4. An N having a first spindle and a second spindle which face each other, and which can be machined by each of the first spindle and the second spindle.
A C lathe, a bar feeding device for feeding a bar to the NC lathe, and a first, a second, and a second in order from the front of the bar feeding device for detecting the position of the feed arrow of the bar feeding device. In the machining method using the NC lathe for automatic bar machining, which has the third position detecting means (LSA, LSB, LSC), the third position detecting means (LSC) is turned on and the second Position detection means (LS
If B) is not turned on, the bar is pulled out by the second spindle and one or more products are processed, and the remaining material after processing is a new material and is pushed out from the guide bush. If the second position detecting means (LSB) is turned on,
After processing, perform the second operation of pulling out the remaining material with the feed arrow and replacing it with a new material, and both the second position detecting means (LSB) and the first position detecting means (LSA) are turned on by the time the processing of the product is completed. In the case of, a third operation for interrupting the machining is performed, and a machining method using an NC lathe for automatic bar machining. 5. A detecting means for detecting the most advanced position of the feed arrow by the first position detecting means, and a second position detecting means for detecting that the length of the bar has reached a first predetermined length. And the first position detecting means and the third position detecting means are the second
5. The machining method by the NC lathe for automatic bar machining according to claim 4, wherein the NC lathes are separated from each other by a predetermined length. 6. The first predetermined length is a minimum length capable of processing one product including a supporting margin by the guide bush,
The processing method using the NC lathe for automatic bar material processing according to claim 5, wherein the second predetermined length is the length of one product including the cut-off allowance.