JP4195524B2 - Bar feeder - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a bar feeder that feeds a bar to a spindle of an automatic lathe.
[0002]
[Prior art]
As shown in FIG. 4, the bar feeder includes a bar-shaped feed rod 2 that pushes the bar 1 in the axial direction, and a guide pipe 3 that guides the feed rod 2. A finger chuck 4 that grips the bar 1 is rotatably provided at the front end of the feed rod 2, and a connecting plate 2 a that is connected to the drive device is fixed to the rear end of the feed rod 2. The guide pipe 3 has a U-shaped cross section and guides the feed rod 2 at the bottom. The bar feeder is centered so that the center line 9 of the main shaft 5 and the center line of the guide pipe 3 coincide.
[0003]
The feed rod 2 grasps the bar 1 with the finger chuck 4, pushes the bar 1 in the axial direction, and supplies it to the main spindle 5 of the lathe. The bar 1 is chucked by a collet chuck 10 provided at the front end of the main shaft 5, is rotationally driven, and is cut by a cutting tool (not shown) provided in front of the collet chuck 10. The bar 1 rotates with the vicinity of the front end held by the collet chuck 10 and the rear end held by the finger chuck 4.
[0004]
On the other hand, a fixed pipe 6 is provided in the rotating main shaft 5. This fixed pipe 6 is cantilevered by a bush 8 attached to a fixed frame 7 separated from the main shaft 5. The fixed pipe 6 is also arranged to have the same center line as the center line 9 of the main shaft 5. As the processing of the bar 1 proceeds, the feed rod 2 enters the fixed pipe 6 via the guide pipe 3. Even if the feed rod 2 holding the bar 1 is bent by providing the fixed pipe 6, the fixed pipe 6 can be applied to the inner diameter of the fixed pipe 6 to prevent a certain amount of sagging.
[0005]
[Problems to be solved by the invention]
However, the inner diameter of the bottom of the guide pipe 3 is set to be slightly larger than the outer diameter of the feed rod 2 in order to slide the feed rod 2 in the axial direction. For this reason, a slight clearance is generated between the feed rod 2 and the guide pipe 3, and the center line of the finger chuck 4 provided at the front end of the feed rod 2 may not coincide with the center line of the main shaft 5.
[0006]
Further, when the processing progresses and the feed rod 2 is overhanged by the guide pipe 3 and placed in the fixed pipe 6, a slight clearance is provided between the feed rod 2 and the fixed pipe 6 as shown in FIG. Therefore, the feed rod 2 bends within this clearance, and the center line of the finger chuck 4 may not be located on the center line 9 of the main shaft 5.
[0007]
When the bar 1 is rotated in a state where the center line of the finger chuck 4 and the center line 9 of the main shaft 5 do not coincide with each other, the center line 9 of the main shaft 5, that is, the rotation center of the bar 1 and the center of gravity of the bar 1 are Due to the eccentricity, an unbalanced excitation force is applied to the feed rod 2. Due to this excitation force, the feed rod 2 may vibrate during rotation of the main shaft 5. Once the feed rod 2 vibrates, the vibration of the feed rod 2 could not be suppressed.
[0008]
Therefore, an object of the present invention is to provide a bar feeder that can prevent the feed rod from vibrating during the rotation of the main shaft.
[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]
According to the first aspect of the present invention, a bar (14) is grasped by a finger chuck (17) rotatably provided at one end of a feed rod (13), and the bar (14) is pushed in an axial direction so that a main spindle ( 15) In the bar feeder (11) to be fed to the feed rod (13), a position adjusting means (16) is provided inflating on the outer periphery of the feed rod (13), and the position adjusting means (16) is provided in the main spindle (15) of the lathe. The above-mentioned problem is achieved by a bar feeder, which is brought into contact with the inner surface of a fixed pipe (20) provided on the base plate and aligns the center line of the finger chuck (17) with the center line of the main shaft (15). To solve. Here, an elastic body such as a spring or rubber can be used for the position adjusting means (16).
[0011]
According to this invention, the position adjusting means (16) inflated on the outer periphery of the feed rod (13) is brought into contact with the fixed pipe, so that the inner diameter of the fixed pipe (20) and the outer diameter of the feed rod (13) are reduced. Even if there is a clearance between them, the center line of the finger chuck (17) can be aligned with the center line of the main shaft (15). Further, by aligning the center line of the finger chuck (17) with the center line of the main shaft (15), the bar (14) is positioned on the center line (21) of the main shaft (15). Therefore, even if the main shaft (15) rotates, the exciting force due to the unbalance of the bar (14) is not applied to the feed rod (13), and vibration of the feed rod (13) can be prevented.
[0012]
In the invention of claim 2, the bar (14) is gripped by a finger chuck (17) rotatably provided at one end of a feed rod (13) guided in the guide pipe (12), and the bar (14 ) In the bar supply machine (11) that pushes in the axial direction to supply to the main spindle (15) of the lathe
A position adjusting means (16) is provided inflating on the outer periphery of the feed rod (13), the position adjusting means (16) is brought into contact with the inner surface of the guide pipe (12), and the center line of the finger chuck (17) And the center line of the main shaft (15).
[0013]
According to this invention, the position adjusting means (16) inflated on the outer periphery of the feed rod (13) is brought into contact with the guide pipe (12), so that the gap between the guide pipe (12) and the feed rod (13) is increased. Even if there is a clearance, the center line of the finger chuck (17) can be aligned with the center line of the main shaft (15). When the center line of the finger chuck (17) is aligned with the center line of the main shaft (15), the bar (14) is positioned on the center line (21) of the main shaft (15). Therefore, even if the main shaft (15) rotates, the exciting force due to the unbalance of the bar (14) is not applied to the feed rod (13), and the vibration of the feed rod (13) can be prevented.
[0014]
In the invention of claim 3, the bar (14) is grasped by a finger chuck (17) rotatably provided at one end of a feed rod (13) guided in the guide pipe (12), and the bar (14 ) In the bar supply machine (11) that pushes in the axial direction to supply to the main spindle (15) of the lathe
A position adjusting means (16) is provided by inflating the outer periphery of the feed rod (13), and the position adjusting means (16) is provided in the guide pipe (12) and the main shaft (15) of the lathe. ) And the center line of the finger chuck (17) and the center line of the main shaft (15) are aligned.
[0015]
According to this invention, when the rod (14) is initially processed, even when the feed rod (13) is in the guide pipe (12), the rod (14) is processed and the feed rod (13) is fixed to the fixed pipe. Even when it is within (20), the center line of the finger chuck (17) can be aligned with the center line of the main shaft (15). Therefore, regardless of the position of the feed rod (13), the center line of the finger chuck (17) can be aligned with the center line of the main shaft (15).
[0016]
According to a fourth aspect of the present invention, in the first to third aspects of the invention, the position adjusting means (16) includes a plurality of leaf springs (16c).
[0017]
According to the present invention, the plurality of leaf springs (16c) provided on the outer periphery of the feed rod (13) abuts against the inner diameter of the guide pipe (12) or the fixed pipe (20) and bends evenly. Even if there is, the center line of the finger chuck (17) can be aligned with the center line of the main shaft (15). Further, by adjusting the spring force of the leaf spring (16c), the frictional force acting between the position adjusting means (16) and the fixed pipe (20) or the guide pipe (12) can be reduced, and the feed rod (13) Smooth movement becomes possible.
[0018]
According to a fifth aspect of the present invention, in the third aspect of the invention, the center line of the fixed pipe (20) and the center line of the guide pipe (12) are aligned with the center line of the main shaft (15), and the fixed pipe The inner diameter of (20) and the inner diameter of the guide pipe (12) are matched.
[0019]
According to the present invention, the center line of the finger chuck (17) can be more reliably aligned with the center line of the main shaft (14).
[0020]
DETAILED DESCRIPTION OF THE INVENTION
1 to 3 show an embodiment of the bar feeder 11 of the present invention. As shown in FIG. 1, the bar feeder 11 includes a guide pipe 12 and a feed rod 13 that feeds a bar 14 to a main spindle 15 of a lathe.
[0021]
The guide pipe 12 guides the feed rod 13 or the bar 14 in the axial direction and has a U-shaped cross section. The inner diameter of the bottom portion of the guide pipe 12 is set slightly larger than the outer diameter of the feed rod 13 so that the feed rod 13 is slid in the axial direction.
[0022]
The feed rod 13 is formed in a long and narrow bar shape, and pushes the bar 14 in the axial direction to sequentially feed the bar 14 to the main spindle 15 of the lathe positioned forward by a predetermined amount. A finger chuck 17 is attached to the front end of the feed rod 13 so as to be rotatable around a center line of the feed rod 13 via a bearing or the like. The finger chuck 17 grips the small-diameter bar 14 by its elastic expanding deformation. A connecting plate 18 is provided at the rear end of the feed rod 13. The connecting plate 18 is coupled to a driving mechanism (not shown) and moves the feed rod 13 in the axial direction.
[0023]
The feed rod 13 is provided with a plurality of spring portions 16 serving as position adjusting means at regular intervals in the longitudinal direction. 2 and 3, the spring portion 16 is formed by inserting a plurality of slits 16b in an elongated cylindrical ring 16a in the axial direction and bending a thin plate portion between the slits 16b. The spring portion 16 has a plurality of the same elastic leaf springs 16c on the outer periphery. As shown in FIG. 3, a slit 16 d extending in the axial direction is provided at the lower portion of the spring portion 16. The spring portion 16 is fitted into a spring mounting portion 13a which is formed slightly narrower than the outer diameter of the feed rod 13 by opening the cut 16d. When the spring portion 16 is fitted into the spring mounting portion 13 a, the leaf spring 16 c swells from the outer periphery of the feed rod 13. The outer diameter of the spring portion 16 is set larger than the outer diameter of the feed rod 13 and larger than the inner diameter of the bottom portion of the guide pipe 12. The material of the spring portion 16 is spring steel and is baked in consideration of wear resistance. In addition, the spring part 16 may be a coiled spring wound around the feed rod 13 with its central portion inflated.
[0024]
The lathe spindle 15 has a collet chuck 19 at its tip. With this collet chuck 19, the bar 14 fed by the feed rod 13 is grasped. The spindle 15 is rotated at a high speed while the bar 14 is grasped by the collet chuck 19, and the bar 14 is sent to a tool (not shown) positioned forward together with the headstock to cut the bar 14. During the cutting process, the bar 14 is rotated with its front end held by the collet chuck 19 and its rear end held by the finger chuck 17.
[0025]
A fixed pipe 20 is extended from the bar feeder 11 side in the rotating main shaft 15. The fixed pipe 20 is cantilevered by a bush 22 attached to a fixed frame 7 separated from the main shaft 5. The fixed pipe 20 is installed so that the center line of the main shaft 15 coincides with the center line of the fixed pipe 20. The inner diameter of the fixed pipe 20 matches the inner diameter of the guide pipe 12 to guide the feed rod 13 and is set slightly larger than the outer diameter of the feed rod 13.
[0026]
When the feed rod 13 is inserted into the guide pipe 12, the spring portion 16 of the feed rod 13 contacts the inner surface of the guide pipe 12. Since a plurality of leaf springs 16c having the same elasticity are wound around the outer periphery of the spring portion 16, the leaf springs 16c bend evenly, and the center line of the guide pipe 12 and the center line of the feed rod 13 coincide. . Then, with the feed rod 13 inserted into the guide pipe 12, a core for adjusting the height, position, etc. of the bar feeder 11 so that the center line 21 of the main shaft 15 coincides with the center line of the feed rod 13. Take out. By this centering, the center line of the guide pipe 12 and the center line of the feed rod 13 also coincide.
[0027]
Even if there is a clearance between the outer diameter of the feed rod 13 and the inner diameter of the guide pipe 12 by providing a spring portion 16 on the outer periphery of the feed rod 13 and bringing the spring portion 16 into contact with the inner surface of the guide pipe 12, the guide pipe The center line of the feed rod 13 can always be positioned on the 12 center lines. Therefore, the center line of the main shaft 15 and the center line of the finger chuck 17 provided at the tip of the feed rod 13 can always coincide with each other. Further, by providing the leaf spring 16 c on the spring portion 16, the frictional force acting between the spring portion 16 and the guide pipe 12 can be adjusted, and the feed rod 13 can be smoothly moved in the guide pipe 12. In addition, since the spring part 16 is tempered, it is less likely to be worn even if it slides in the guide pipe 12.
[0028]
As the processing of the bar 14 proceeds, the feed rod 13 enters the fixed pipe 20 while being overhanged by the guide pipe 12. When the feed rod enters the fixed pipe 20, the spring portion 16 comes into contact with the inner surface of the fixed pipe 20. Since the plurality of leaf springs 16 c are wound around the outer periphery of the ring 16 a so as to have the same elasticity, the leaf springs 16 c bend substantially uniformly within the fixed pipe 20. For this reason, the tip of the feed rod 13 overhanging in the fixed pipe 20 is prevented from being bent, and even if there is a clearance between the inner diameter of the fixed pipe 20 and the outer diameter of the feed rod 13, the center of the fixed pipe 20 The line and the center line of the feed rod 13 can always be aligned. Since the center line of the fixed pipe 20 and the center line of the main shaft 15 coincide with each other, the center line of the main shaft 15 coincides with the center line of the finger chuck 17 provided at the tip of the feed rod 13. Further, by providing the leaf spring 16 c on the spring portion 16, the frictional force acting between the spring portion 16 and the fixed pipe 20 can be adjusted, and the feed rod 13 can be smoothly moved in the fixed pipe 20.
[0029]
As described above, when the center line 21 of the main shaft 15 and the center line of the finger chuck 17 are matched with each other during the cutting of the bar 14, the bar 14 can be disposed on the center line 21 of the main shaft 15. If the bar 14 is arranged on the center line of the main shaft 15, the center of rotation and the center of gravity of the bar 14 are not decentered, and even if the bar 14 is rotated, the excitation force due to the unbalance of the bar 14 is not affected by the feed rod. 13 does not work. Therefore, the feed rod 13 does not vibrate during the cutting process. In addition, when the bar 14 itself is unbalanced due to the deflection of the bar 14 itself and an excitation force is applied to the feed rod 13, a restoring force is applied from the spring portion 16 to the feed rod 13. The amplitude of the feed rod 13 is reduced.
[0030]
【The invention's effect】
As described above, according to the present invention, the position adjustment means is provided by inflating the outer periphery of the feed rod, and the position adjustment means is fixed to the inner surface of the fixed pipe provided in the main shaft of the lathe. Even if there is a clearance between the inner diameter of the pipe and the outer diameter of the feed rod, the center line of the finger chuck provided rotatably at the tip of the feed rod can be aligned with the center line of the main shaft. Therefore, even if the main shaft rotates, the excitation force due to the unbalance of the bar is not applied to the feed rod, and the feed rod is prevented from vibrating.
[Brief description of the drawings]
FIG. 1 is a plan sectional view showing an embodiment of a bar feeder according to the present invention.
FIG. 2 is a plan view showing a spring portion.
FIG. 3 is a perspective view showing a spring portion.
FIG. 4 is a plan sectional view showing a conventional bar feeder.
FIG. 5 is a cross-sectional view showing a feed rod in the conventional fixed pipe.
[Explanation of symbols]
11 Bar feeder 12 Guide pipe 13 Feed rod 14 Bar 15 Main shaft 16 Position adjusting means (spring part)
17 Finger chuck 20 Fixed pipe 21 Center line

Claims (5)

In a bar feeder that grips a bar with a finger chuck rotatably provided at one end of the feed rod, and pushes the bar in the axial direction to supply it to the main spindle of the lathe,
A position adjusting means is provided by inflating the outer periphery of the feed rod, the position adjusting means is brought into contact with the inner surface of a fixed pipe provided in the main shaft of the lathe, and the center line of the finger chuck and the center line of the main shaft are Bar supply machine characterized by matching. In a bar feeder that grips a bar with a finger chuck rotatably provided at one end of a feed rod guided in the guide pipe, and pushes the bar in the axial direction to supply the main axis of the lathe,
A bar characterized by being provided with position adjusting means inflated on the outer periphery of the feed rod, the position adjusting means being brought into contact with the inner surface of the guide pipe, and the center line of the finger chuck and the center line of the main shaft being aligned. Material feeder. In a bar feeder that grips a bar with a finger chuck rotatably provided at one end of a feed rod guided in the guide pipe, and pushes the bar in the axial direction to supply the main axis of the lathe,
Position adjustment means is provided by inflating the outer periphery of the feed rod, the position adjustment means is brought into contact with the inner surface of the guide pipe and the fixed pipe provided in the main shaft of the lathe, the center line of the finger chuck and the main shaft A bar feeder that matches the center line. 4. The bar feeder according to claim 1, wherein the position adjusting means has a plurality of leaf springs. The bar supply according to claim 3, wherein the center line of the fixed pipe and the center line of the guide pipe are aligned with the center line of the main shaft, and the inner diameter of the fixed pipe and the inner diameter of the guide pipe are aligned. Machine.

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