JP3984702B2 - Centering jig for bar feeder and centering method of bar feeder - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a centering jig for a bar feeder used for centering a centerline of a main shaft of a lathe and a centerline of a bar feeder of a bar feeder for supplying a bar to the main shaft of a lathe.
[0002]
[Prior art]
There is known a bar feeder that sequentially feeds a bar to be machined to a main spindle of an automatic lathe by a predetermined machining amount. As shown in FIG. 6, the bar feeder 1 has a bar-shaped bar feeder 2. The bar feeder 2 pushes the bar 3 in the axial direction, and a bar is placed on the main shaft 5 of the automatic lathe 4 positioned in front. The material 3 is supplied. A clamp portion 6 that can rotate around the center line of the bar feeder 2 is attached to the tip of the bar feeder 2. The clamp 3 is used to grasp the bar 3. The bar feeder 2 is guided in the axial direction by a guide pipe (not shown) having an inner diameter matched with the outer diameter of the bar feeder 2. On the other hand, the spindle 5 of the automatic lathe 4 has a chuck portion 7 at the tip thereof, and chucks the bar 3 sent from the bar feeder 1. The chucked bar 3 is fed together with the headstock 8 while rotating, and is cut by a cutting tool (not shown) positioned on the front side of the chuck portion 7. During the cutting process, the bar 3 is rotated with its front end held by the chuck portion 7 and its rear end held by the clamp portion 6.
[0003]
Here, if the center line of the bar feeder 2 and the center line of the main shaft 5 do not exactly match, the bar 3 vibrates during the rotation of the main shaft 5 during cutting, and noise is generated. This vibration of the bar 3 adversely affects the machining accuracy. For this reason, the centering which matches the center line of the bar feeder 2 and the center line of the main shaft 5 is performed.
[0004]
Conventionally, as a centering method of the bar feeder 1, there is a centering method in which the bar feeder 2 is inserted into the main shaft 5 as shown in FIG. In this centering method, the bar feeder 2 is advanced and placed in the rear end of the main shaft 5. Then, the gaps a, b, c, and d generated between the main shaft 5 and the bar feeder 2 in the vertical and horizontal directions are measured. Next, the bar feeder 2 is further advanced, and the gap is measured again at the tip of the main shaft 5. The position of the bar feeder 1 is adjusted so that the measured gaps at both the front end and the rear end of the main shaft 5 are all equal. In this way, the bar feeder 1 is centered by aligning the center line of the bar feeder 2 and the center line of the main shaft 5.
[0005]
As another centering method, there is a thread tension centering method. In this centering method, as shown in FIG. 8, the bar feeder centering bush 9 is fixed to the tip of the bar feeder 2, and the fishing line 10 is extended from the center line of the bar feeder 2. On the other hand, the main shaft centering bush 11 that causes the center line of the main shaft 5 to be gripped is held by the chuck portion 7 of the main shaft 5. Then, the fishing line 10 is passed through the centering bush 11 for the main shaft, and the loosening prevention weight 12 is hung from the tip of the fishing line 10. A magnet point 13 for measuring the position of the fishing line 10 is attached to the rear end of the main shaft 5. The bar feeder 2 is moved in the axial direction, and the vertical and horizontal positions of the bar feeder 1 are adjusted while confirming that the fishing line 10 is at the center of the main shaft 5 at the magnet point 13 provided at the rear end of the main shaft 5. In this thread tension centering method, since the center line of the bar feeder 2 and the center line of the main shaft 5 are connected by the fishing line 10, the reference line can be easily confirmed, and high-precision centering is possible.
[0006]
[Problems to be solved by the invention]
However, in the centering method in which the conventional bar feeder 2 is placed in the main shaft 5, the measurement of the gap often relies on the operator's sense and there is no reproducibility. For this reason, it was not possible to center with high accuracy. Further, when the automatic lathe 4 is covered with a cover, the gap between the main shaft 5 and the bar feeder 2 may not be measured.
[0007]
Moreover, in the centering method of the tension, it is possible to center with high accuracy, but the centering operation takes time, and a plurality of tools such as a centering bush and a fishing line are required.
[0008]
Then, an object of this invention is to provide the centering jig | tool for bar feeders which can perform centering with a bar feeder and a main shaft easily and with high precision.
[0009]
[Means for Solving the Problems]
The present invention will be described below. In addition, in order to make an understanding of this invention easy, the reference number of an accompanying drawing is attached in parenthesis writing, However, This invention is not limited to the form of illustration.
[0010]
The invention of claim 1 is a bush (21) gripped by a lathe chuck (23), and a light emitting portion attached to the bush (21) and emitting light having directivity on the center line of the bush (21). (22) to solve the above-described problem by a bar feeder centering jig (hereinafter referred to as a centering jig) (20).
[0011]
According to this invention, when the centering jig (20) is gripped by the lathe chuck (23), light having directivity is emitted on the center line of the main shaft (24). This light creates a reference line for the centerline of the straight main axis (24) with no deflection in the air. By aligning the bar feeder (31) so that the reference line and the center line of the bar feeder (25) coincide with each other, the center line of the spindle (24) and the center line of the bar feeder (25) are aligned. Centering is possible. In this way, since the center line of the main shaft (24) appears in the air simply by gripping the centering jig (20) by the lathe chuck (23), the main shaft (24) can be easily and highly accurate. It is possible to center the center line of the bar feeder and the center line of the bar feeder (25).
[0012]
According to a second aspect of the present invention, in the first aspect of the present invention, the light emitting section (22) emits a laser beam.
[0013]
According to the present invention, it is possible to prevent the spread of the beam diameter by emitting a laser beam that is a substantially parallel light beam, and to obtain a reference line that proceeds in a straight line with a thin beam diameter. Moreover, since it is monochromatic, it becomes easy to confirm the reference line even during daytime work.
[0014]
According to a third aspect of the present invention, in the first or second aspect of the present invention, the bush (21) includes a plurality of cylindrical portions (26) having a center line identical to the center line of the bush (21). It is characterized by providing.
[0015]
According to the present invention, since the bush (21) includes the cylindrical portion (26) having a plurality of diameters, the cylindrical portion (26) corresponding to the diameter of the bar to be processed can be gripped by the lathe chuck (23). it can. Therefore, the center line of the main shaft (24) and the center line of the bar feeder (25) can be centered according to the diameter of the bar to be processed.
[0016]
According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the bush (21) has a light passage hole (27) formed on a center line of the bush (21), and the light emitting section (22) is attached to the bush (21) via adjusting means (28, 29, 30) for aligning the center line of the bush (21) and the optical axis of the light emitting part (22). . Here, the adjusting means (28, 29, 30) is the direction positioning for positioning the direction of the center line of the light passage hole (27) and the direction of the optical axis of the light emitting part (22), and the light passage hole (27). It has a center positioning function for positioning the center and the center of the optical axis of the light emitting section (22).
[0017]
According to the present invention, since the light emitting part (22) is attached to the bush (21) via the adjusting means (28, 29, 30), before being held by the lathe chuck (23), the bush (21 ) Can be reliably aligned with the light passage hole (27) formed on the center line, and light can be emitted without blur from the center line of the bush (21). For this reason, when the bush (21) is gripped by the lathe chuck (23), light serving as a reference line can be easily emitted onto the center line of the main shaft (24).
[0018]
The invention according to claim 5 is a bar for pressing the center line of the main shaft (24) of the lathe (32) and the bar to be processed in the axial direction of the bar and supplying the main shaft (24) of the lathe (32). A method of centering a bar feeder (31) that aligns with the center line of a feeder (25), wherein the bar feeder (25) is rotated from the center line of the main shaft (24) while rotating the main shaft (24). A laser beam is irradiated to the end surface on the lathe (32) side, the bar feeder (25) is moved in the axial direction of the bar, and the laser beam is irradiated to a predetermined position on the bar feeder (25). The position of the bar feeder (31) is adjusted.
[0019]
According to this invention, the center line of the main shaft (24) can be confirmed on the bar feeder (25) by irradiating the bar feeder (25) from the center line of the main shaft (24). Further, the bar feeder (25) is moved in the axial direction of the bar, and the position of the bar feeder (31) is adjusted so that the laser beam is irradiated to a predetermined position on the bar feeder (25). Even if the bar feeder (25) moves, the center line of the bar feeder (25) and the center line of the main shaft (24) can be aligned with the whole bar feeder (25).
[0020]
DETAILED DESCRIPTION OF THE INVENTION
1 and 2 show a centering jig in one embodiment of the present invention. As shown in FIGS. 1 and 2, the centering jig includes a bush 21 held by a lathe chuck and a light emitting unit 22 attached to the bush 21.
[0021]
The bamboo shoot-like bush 21 includes a cylindrical portion 26 having a plurality of diameters. The cylindrical portion 26 has the same center line, and the diameter decreases toward the tip of the bush 21. The outer diameter of the cylindrical portion 26 is variously set according to the diameter of the bar to be processed. The cylindrical portion 26 is gripped by a lathe chuck. A light passage hole 27 having a small diameter of about Φ2 is formed on the center line of the bush 21. Due to the small diameter drilling process, the small diameter can be formed only at the tip of the bush 21 in consideration of workability. A light emitting portion insertion hole 34 into which the head portion 33 of the light emitting portion 22 is inserted is formed on the base side of the bush 21. The base side outer periphery of the bush is fitted into a disk-shaped guide 35, and is fixed to the guide 35 by a mounting bolt 36.
[0022]
The cylindrical light emitting unit 22 has a semiconductor laser at the head 33. A red visible laser beam is output from the semiconductor laser by electric energy from a battery provided in the light emitting unit 22. A spherical bush 30 is wound around the outer periphery of the light emitting unit 22. The light emitting unit 22 is not limited to a laser beam as long as it can emit substantially parallel light having directivity, and may be a combination of an incandescent bulb and a lens.
[0023]
The light emitting unit 22 is fixed to the bush 21 via a lower flange 28, an upper flange 29, and a spherical bush 30 which are adjusting means having functions of center alignment and direction alignment. The light emitting unit 22 is sandwiched between the lower flange 28 and the upper flange 29. Since the spherical bush 30 is wound around the outer periphery of the light emitting unit 22, the light emitting unit 22 can swing its head with respect to the lower flange 28 and the upper flange 29. The light emitting unit 22 is attached to the bush 21 by bolting the lower flange 28 to the guide 35 to which the bush 21 is fixed. Since the lower flange 28 has a flaw hole 37, the lower flange 28 is slightly shifted on the plane of the guide 35, and the center of the light passage hole 27 and the center of the light emitting portion 22 can be positioned. . On the other hand, the positioning of the direction of the center line of the light passage hole 27 and the direction of the optical axis of the light emitting unit 22 is performed by swinging the head of the light emitting unit 22 between the lower flange 28 and the upper flange 29. Thus, since the light emission part 22 is attached to the bush 21 via the adjustment means which has the function of direction positioning and center positioning, it can radiate | emit light reliably on the centerline of the bush 21. FIG.
[0024]
FIG. 3 shows a centering method of the bar feeder in one embodiment of the present invention. The bar feeder 31 supplies the bar to the main shaft 24 of the automatic lathe 32 as in the prior art. The bar feeder 25 pushes the bar to be processed in the axial direction of the bar and feeds it to the main shaft 24. Have. The rear end of the bar feeder 25 is connected to a driving device such as the timing belt 40. The bar feeder 25 is guided by an unillustrated guide pipe so as to be movable in the axial direction. As in the prior art, the automatic lathe 32 grasps the bar material sent by the bar feeder 25 with the chuck portion 23, rotates the bar material and feeds it together with the headstock 41, and cuts the bar material.
[0025]
In this centering method, first, the centering jig 20 is gripped so that the laser beam is irradiated to the bar feeder 25 side by the chuck portion 23. At this time, the chuck portion grips the cylindrical portion 26 of the bush 21 corresponding to the diameter of the rod to be processed. In this state, the main shaft 24 is rotated at a low speed. Since the center line of the bush 21 and the optical axis of the laser beam are adjusted, a laser beam 42 having directivity is emitted on the center line of the main shaft 24. This laser beam 42 forms a reference line of the center line of the straight main shaft 24 without any deflection in the air. The laser beam 42 is irradiated onto the main shaft side end surface 25 a of the bar feeder 25.
[0026]
Next, the bar feeder 25 is moved in the axial direction, and the center of the rotation locus of the laser beam 42 is confirmed at the moved position. The bar feeder 31 is moved in the vertical and horizontal directions so that the center of the rotation trajectory appears at a certain position. Even if the bar feeder 25 is moved in the axial direction, the center line of the main shaft 24 and the bar feeder can be extended over the entire length of the bar feeder 25 even if the bar feeder 25 is moved if the center of the rotation locus of the laser beam is maintained at a fixed position. 25 center lines can be matched.
[0027]
Depending on the chucked state of the bush 21, the center line of the bush 21 may not match the center line of the main shaft 24, that is, the center line of the main shaft 24 may not match the optical axis of the laser beam 42. In this case, the rotation trajectory of the laser beam 42 appearing on the spindle-side end surface 25a of the bar feeder 25 becomes a circle having a certain radius, but the center line of the spindle 24 can be known by obtaining the center of the circle. Even when the laser beam 42 is emitted in an elliptical shape, the center line of the main shaft 24 can be known by obtaining the center of the circle appearing on the main shaft side end surface 25a of the bar feeder 25.
[0028]
4 and 5 show an example of the position adjustment of the bar feeder 31 in the vertical direction and the horizontal direction. The bar feeder 31 is provided with two leg portions 43 a and 43 b in the longitudinal direction of the bar feeder 25. The bar feeder 31 is moved in the vertical direction by adjusting the lengths of the leg portions 43a and 43b. Moreover, adjustment to the horizontal direction of the bar supply apparatus 31 is performed by moving the leg parts 43a and 43b whole. FIG. 5 shows an example of the leg portions 43a and 43b. Leg 43a. 43 b includes a base portion 45, a nut 46 that is rotatably supported by the base portion 45, and a height adjusting screw 47 that is screwed into the nut 46. When the nut tightening bolt 48 is loosened and the nut 46 is rotated, the height adjusting screw 47 screwed to the nut 46 moves up and down, and the lengths of the leg portions 43a and 43b are adjusted.
[0029]
【The invention's effect】
As described above, according to the present invention, a bar feeder centering jig is provided with a bush held by a lathe chuck and light having directivity on the center line of the bush. When the centering jig is gripped by a lathe chuck, light having directivity is emitted on the center line of the spindle. This light creates a reference line for the centerline of the straight main axis with no deflection in the air. By aligning the bar feeder so that the reference line and the center line of the bar feeder coincide, the center line of the spindle and the center line of the bar feeder can be centered easily and with high accuracy. be able to.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a centering jig for a bar feeder according to an embodiment of the present invention.
FIG. 2 is a plan view of FIG.
FIG. 3 is a perspective view showing a centering method of a bar feeder according to an embodiment of the present invention.
FIG. 4 is a perspective view showing a bar feeder.
FIG. 5 is a side view showing a leg portion.
FIG. 6 is a perspective view showing a bar feeder and a lathe.
FIG. 7 is a cross-sectional view of a bar feeder showing an example of a conventional centering method.
FIG. 8 is a cross-sectional view showing an example of a conventional centering method.
[Explanation of symbols]
20 Bar material feeder centering jig 21 Bush 22 Light emitting portion 23 Lathe chuck 24 Main shaft 25 Bar feeder 26 Cylindrical portion 27 Light passage holes 28, 29, 30 Adjusting means 31 Bar material feeder 32 Lathe

Claims (5)

A centering jig for a bar feeder, comprising: a bush gripped by a lathe chuck; and a light emitting portion attached to the bush and emitting light having directivity on a center line of the bush. The centering jig for a bar feeder according to claim 1, wherein the light emitting unit emits a laser beam. The bar bushing centering jig according to claim 1 or 2, wherein the bush includes a cylindrical portion having a plurality of diameters having the same center line as the center line of the bush. The bush has a light passage hole formed on a center line of the bush, and the light emitting portion is attached to the bush via an adjusting means for aligning the center line of the bush and the optical axis of the light emitter. The centering jig for bar feeders according to any one of claims 1 to 3. A centering method of a bar feeder that matches a center line of a lathe main axis and a bar feeder to be processed by pushing the bar to be machined in the axial direction of the lathe and feeding to the main axis of the lathe,
A laser beam is irradiated from the center line of the main shaft to the lathe-side end surface of the bar feeder while rotating the main shaft, the bar feeder is moved in the axial direction of the bar, and the bar feeder is moved to a predetermined position on the bar feeder. A method of centering a bar feeder, wherein the position of the bar feeder is adjusted so that a laser beam is irradiated.

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