JPH1058203A - Rod material swinging preventive device of rod supplying device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To decrease vibrations as much as practicable and suppress noise emission even if a rod material having a polygonal section is used. SOLUTION: A bracket having a rod penetrating hole is secured to the base of a rod supplying device, and a link mechanism 22 is operated by a cylinder- piston mechanism fixed to the bracket, and a pair of movable plates 30a and 30b equipped with rod inserting holes 32a and 32b are pivoted on the bracket and connected with the link mechanism 22, and a stopper mechanism 39 for restricting the operating amount of the link mechanism 22 is mounted on the bracket, wherein the rod inserting holes 32a and 32b are aligned when the link mechanism 22 is out of operation while they 32a and 32b are displaced from each other by swinging the two plates 30a and 30b when the link mechanism 22 is in operation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-vibration device for a bar feeder, and more particularly, to a method for converting a long bar (square) having a square, hexagonal or octagonal cross section into an NC automatic lathe or the like. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-sway device of a bar supply device for minimizing rotational runout of a square bar when processing while supplying.

[0002]

2. Description of the Related Art Generally, a bar feeder continuously feeds an elongated bar (long bar) to an NC automatic lathe or the like.
The bar thus fed is gripped by a chuck of an NC automatic lathe and cut by a tool such as a cutting tool. That is, the bar feeder grips the rear end of the bar with the feed finger, and when the chuck of the NC automatic lathe is opened, feeds the bar held by the feed finger by a predetermined amount. In this state, the chuck is closed and the bar is cut. In this case, the spindle of the NC automatic lathe is rotating at a high speed, and therefore the bar is also rotating at a high speed, so that the intermediate portion not gripped by the chuck and the feed finger is swung like a skipping rope. In addition, rotational deflection occurs in the bar. In order to prevent this, a steady rest device has been conventionally used.

[0003] There is a conventional steady rest device as shown in FIG. 7 or FIG. FIG. 7 shows a roller type steady rest device, in which four rollers 101a, 101b, 101 are provided.
The bars W and the like are sandwiched between c and 101d.
Two of the four rollers (101a, 101b;
101c, 101d) to axes 102a, 102b, 102
A pair of blocks 103a, 103 via c, 102d
b, each of the blocks 103a, 103a
03b is changed in the vertical direction by lever mechanisms 104a and 104b so as to sandwich the bar W and the like to prevent the rotational vibration of the bar W and the like. FIG.
Is a belt-type steady rest device, and four rollers 105a,
105b, 105c, 105d and a pair of belts 106
a, 106b and a pair of arms 107a, 1 which can be opened and closed freely.
07b. By changing the distance between the pair of belts 106a and 106b running opposite to each other, the bar W
The rotation of the bar W or the like is prevented by sandwiching the bar.

[0004]

However, in the conventional bar anti-sway device, if the bar has a circular circular cross section, the rotation can be relatively easily reduced by supporting the bar with a plurality of rollers. Although it can be prevented, when the section is a polygon such as a hexagon, as shown in FIG.
The rollers 101a, 101b, 101c, and 101d collide with the outer peripheral portions of the rollers 101a and 101d and repel each other.
This results in periodic movement between the dashed lines, resulting in large vibrations and accompanying loud noises, which become more severe as the rotational speed increases.

[0005] Further, in the belt-type steady rest device shown in FIG. 8, even in the case of a bar having a circular cross section, this bar is used as the belt 106a, 1b.
06b receives a large force, it is difficult to feed the bar in the axial direction, and the belt 106
a and 106b are severely damaged and their life is short. In particular, when the bar W has a polygonal cross section as shown in the figure, there is a disadvantage that the life of the belts 106a and 106b is significantly shortened.

As a result of various studies, the inventor of the present invention has found that when a bar having a polygonal cross section such as a hexagon rotates, the rotation periodically moves a steady rest device such as a roller. Obtained the knowledge that vibration greatly affects the processing accuracy of products, and conducted research and development based on this,
In spite of the simple structure, even if a polygonal material such as a hexagonal material is used, the vibration of the material is reduced as much as possible, and a bar material steadying device of a bar material supply device that does not generate much noise has been invented. .

[0007]

In order to achieve this object, a bar steady rest according to the present invention is a bar steady rest provided at the tip of a bar feeder, and comprises a base for the bar feeder. A bracket fixed to the base and having a rod passing hole, a cylinder piston mechanism fixed to the bracket, a link mechanism operated by the cylinder piston mechanism, and a link mechanism pivotally attached to the bracket and the link mechanism, respectively. A pair of movable plates each having a bar insertion hole, and a stopper mechanism attached to the bracket to limit an operation amount of the link mechanism. When the link mechanism is not operated, the pair of movable plates is movable. The axes of the rod insertion holes are aligned so that the rod insertion holes overlap with each other, and the pair of movable plates are swung during the operation of the link mechanism. Characterized in that was so as to offset each other.

The link mechanism comprises a pair of levers arranged in parallel, and a connecting lever pivotally connected to one end of each of the pair of levers and connected to the bracket so as to swing freely, One of the pair of levers is connected to the cylinder piston mechanism. The rod insertion hole is a sleeve in which a bearing is interposed between the movable plate and a buffer member is attached to an intermediate portion of the sleeve. Further, the stopper mechanism is a screw member that can be adjusted with respect to the bracket, and a tip end of the screw contacts the link mechanism.

[0009]

According to the present invention, by driving a cylinder piston mechanism, a link mechanism connected to a piston rod of a cylinder is operated, and a pair of movable plates pivotally attached to a bracket are respectively supported. Orbit about an axis. Therefore, the rod insertion holes formed in the pair of movable plates are narrowed to each other, and the passage hole of the rod constituted by these holes is smaller than the rod insertion hole. This size is determined by adjusting the stopper mechanism so as to match the size of the square bar, that is, the length of the diagonal line having the largest diameter.

By the driving of the cylinder piston mechanism, the passage holes are partially overlapped with each other with the axes of the two rod insertion holes shifted from each other. Even when the timber rotates, the vertex of the timber contacts the arc-shaped inner peripheral surface. The length of the timber is different between the length connecting the diagonal and the length connecting the opposite sides. That is, since the distance from the center axis of the bar to the surface changes periodically from the top to the next vertex, there is a gap that periodically changes between the bar and the passage hole as the bar rotates. The gap is a small amount, and the rotational runout of the square bar is limited within the small gap. Since the cushioning member is attached to the inner peripheral surface, even if the vertex of the square bar collides, it can be absorbed. Unlike the conventional method, where the top of the timber contacts the outer peripheral surface of the roller, that is, circumscribes, unlike the past, the apex of the lumber contacts the inner peripheral surface, that is, inscribes a small impact force, and the vibration and the accompanying noise are extremely low. Become smaller.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a front view of a bar supply device incorporating a bar rest device (hereinafter, simply referred to as a bar rest device) of a bar supply device of the present invention, which is installed adjacent to an NC automatic lathe or the like. The state is shown. FIG. 2 is a front view of the bar steadying device, and FIG. 3 is a perspective view of the bar steadying device, showing a state where the bar steadying device is not operated. FIG. 4 is a side view showing a state at the time of operation of the bar steady rest device. FIG. 5 is a cross-sectional view taken along line XX of FIG. 3, and FIG. 6 is a diagram showing a relationship between hexagonal members and passing holes.

As shown in FIG. 1, reference numeral 1 denotes a bar feeder,
It is provided adjacent to the NC automatic lathe 3 by the columns 2 and 2. Reference numeral 4 denotes a bar material steadying device, which is attached to the tip of the bar material supply device 1, that is, the end on the NC automatic lathe 3 side. Reference numeral 5 denotes an operation panel, and reference numeral 6 denotes a control box, by which the bar feeder 1 is operated and the feed state of the bar is controlled. W is a long bar (square bar), the chuck 7 of the NC automatic lathe 3 and the bar feeder 1
The bar W is held by the feed finger 8 inside, and the bar W is prevented from rotating by the bar anti-sway device 4. The bar W held by the chuck 7 of the NC automatic lathe 3 is cut by a tool (not shown) such as a cutting tool installed in front of the chuck 7.

Next, the steady rest device 4 will be described.
As shown in FIG. 2, a substantially rectangular bracket 12 is vertically attached to the base 11 of the bar supply device 1 so as to be orthogonal to the axis C of the bar W. Bracket 12
5, a bar passage hole 12b through which the bar W passes is formed. An air cylinder 13 is fixed above the bracket 12, and a piston rod 14 rotatably pivotally connects a first lever 19 and a connecting lever 17 by a shaft pin 16. The connecting lever 17 is also pivotally connected to the second lever 20 by a shaft pin 21 so as to be freely rotatable. First lever 19 and second lever 20
Are arranged in parallel with each other (see FIG. 3), and both ends of the connecting lever 17 are respectively connected to the shaft pins 16 and 21 as described above.
Are connected to the first lever 19 and the second lever 20, and an intermediate portion thereof is rotatably attached to the bracket 12 by a shaft pin 18. These first levers 1
The connecting lever 17, the second lever 20, and the shaft pins 16, 18, 21 for pivotally connecting them constitute a link mechanism 22. The air cylinder 13 and the piston rod 14 constitute a cylinder piston mechanism 15.

As shown in FIGS. 3 and 4, the first lever 1
The other end of 9 is rotatably connected to the first movable plate 30a by a shaft pin 24. The other end of the second lever 20 is rotatably connected to the second movable plate 30b by a shaft pin 25. The first movable plate 30a is formed of a rectangular plate, and one end of the first movable plate 30a is rotatably attached to the bracket 12 via the support shaft 33. As shown in FIG. 5, the first movable plate 30a
The support shaft 33 is attached via a sleeve 34 so as to provide a predetermined distance D between the support shaft 33 and the second movable plate 30b described below. The second movable plate 30b is also the first movable plate 30a.
And one end thereof is rotatably attached to the bracket 12 via the support shaft 34. For this reason,
When the piston rod 14 is driven by the air cylinder 13, the first movable plate 30 a and the second movable plate 30 b are rotated by the link mechanism 22 about the support shafts 33 and 34 as fulcrums.

Reference numeral 39 denotes a stopper mechanism, which is, for example, a screw member which is screwed into the side plate 12a of the bracket 12 so as to be adjustable, and the tip of which is in contact with one end of the connecting lever 17 (the second lever 20 side in the illustrated embodiment). Thus, the swing amount of the connecting lever 17 is limited. By adjusting the position of the stopper mechanism (screw member) 39, the movement of the link mechanism 22 is restricted, and the first movable plate 30a and the second movable plate 30b are adjusted to have the maximum diameter of the bar W as described later. Is determined.

FIGS. 3, 4 and 5 show the first movable plate 30a.
A bar insertion hole 32a through which the bar W passes is formed on the opposite side of the support shaft 33 as shown in FIG. At the inner diameter of the rod insertion hole 32a, for example, a sleeve 36a with a bearing 35a interposed and a retaining ring 38a for attaching the sleeve 36a to the first movable plate 30a are provided. A cushioning member 37a made of an elastic material such as an annular rubber is provided at a central portion inside the sleeve 36a.
Is attached. As shown in FIG. 5, a bar insertion hole 32b through which the bar W passes is formed in the second movable plate 30b on the side opposite to the support shaft 34. A sleeve 36b with a bearing 35b interposed therebetween and a retaining ring 38b for attaching the sleeve 36b to the second movable plate 30b are provided on the inner diameter of the bar insertion hole 32b, similarly to the bar insertion hole 32a. Similarly, a cushioning member 37b made of an elastic body such as an annular rubber is attached to the inner central portion of the sleeve 36b.

In the state of FIG. 3 where the air cylinder 13 is not driven, that is, when the air cylinder 13 is not operated, the first movable plate 30a and the second movable plate 30b are vertically overlapped, and the rod insertion holes 32a, 32b is configured so that their axes (centers) coincide with each other and overlap each other. This rod insertion hole 32
The sizes of a and 32b are configured to be slightly larger than the maximum diameter of the bar W passing therethrough, and the first movable plate 30a and the second movable plate 30b are driven by the air cylinder 13 via the link mechanism 22. By rotating each other, the rod insertion holes 32a, 3
As shown in FIG. 4, the passing holes 40 formed by partially overlapping the holes 2 b are made equal to the maximum diameter T of the bar W. When the bar diameter changes, the size of the passage hole 40 is adjusted by operating the stopper mechanism 39.

Next, the operation of the present invention will be described.

Initially, the feed finger 8 is retracted to the leftmost end of the bar feeder 1 in FIG. In this state, a long bar (hereinafter, referred to as a square) W having a polygonal cross section (for example, a hexagon) rolls down from the material shelf (not shown) into the bar feeder 1 and is gripped by the feed finger 8. . Next, while holding the square bar W with the feed finger 8, the bar W is advanced toward the NC automatic lathe 3 by a command from the control box 6, and the bar bar insertion hole 32a of the bar bar steadying device 4 in the state shown in FIG. , 32
b and the rod passage hole 12b. Since the cylinder piston mechanism 15 is not driven in the non-operation state in FIG. 3, the rod insertion holes 32a and 32b and the rod passage holes 1
The axis of 2b coincides with the axis C of the bar W, and the bar W passes with a margin. Further, the square bar W passes through the spindle of the NC automatic lathe 3 and the chuck 7, and its tip is pressed against a stopper (not shown) to stop moving forward and is held by the chuck 7.

Next, the air cylinder 13 is driven to move the piston rod 14 forward. As described above, since the connecting lever 17, the first lever 19, and the second lever 20 form the link mechanism 22, when the piston rod 14 advances, the connecting lever 17 pivotally mounted by the shaft pin 16 is moved. It rotates counterclockwise about the shaft pin 18. As a result, the first lever 19 moves in the direction of arrow A,
The second lever 20 moves in the direction of arrow B to move the first movable plate 30
a is rotated clockwise about the support shaft 33, and the second movable plate 30b is similarly rotated clockwise about the support shaft 34 to be in a state as shown in FIG. As a result, the axis of the rod insertion hole 32a of the first movable plate 30a and the axis of the rod insertion hole 32b of the second movable plate 30b are shifted, and the rod insertion hole 32a and the rod insertion hole 32b partially overlap. The interval between the corresponding arc portions is reduced, and the square material passage hole 40 is formed. At this time, the rotation angle of the connecting lever 17 is limited by the stopper mechanism 39 so that the square bar passage hole 40 has the distance T between the opposing vertices (FIGS. 4 and 5) which is the maximum diameter of the square bar W.
That is, by adjusting the position of the stopper mechanism 39, a square material passage hole 40 corresponding to the size of the square material W is formed.

When the bar W is gripped by the chuck 7, the main shaft is driven to rotate, and the bar W is cut by a cutting tool or the like. While the square bar W is being processed by the NC automatic lathe 3, the air cylinder 13 is driven to move the piston rod 14 forward, and the connecting lever 17 is kept in contact with the stopper mechanism 39 so that the square bar passage hole 40 is large. To keep it constant.

Referring to FIG. 6 in more detail, the operation of the rotation steadying device in the bar steadying device 4 according to the present invention will be described. Therefore, each vertex 41 of the square bar W draws an arc 42 having a radius from the center C to the vertex 41. By the way, the rectangular material passage hole 40 is displaced by the arc of the rod insertion hole 32a whose axis Y is displaced by the rotation of the first movable plate 30a, and by the rotation of the second movable plate 30b. And the arc of the inserted bar insertion hole 32b. As can be seen from FIG. 6, the minimum diameter of the rectangular bar passage hole 40 formed by these arcs is equal to the maximum diameter T of the rectangular bar W. As described above, although the tip end is gripped by the chuck 7 and the rear end is gripped by the feed finger 8 as described above, it does not support in the center and rotates at a high speed. The arc portion 42 of FIG.
Is the motion trajectory of each vertex 41 when there is no rotational vibration in the square bar W. When the rotational vibration occurs, the motion trajectory of each vertex 41 of the rectangular bar W tends to be an arc having a larger radius than the arc portion 42. However, since the square bar passage hole 40 is maintained at a constant size T, the rotational runout of the square bar W is limited.

As described above, the distance between the center axis and the surface of the timber W is from the vertex 41 to the next vertex 41.
, A gap that periodically changes between the square bar W and the square bar passage hole 40 occurs as the square bar W rotates. However, this gap is a small amount, and within the range of this small gap, the square bar W only causes rotational runout. At this time, the vertices 41 of the timber W periodically collide with the inner peripheral surface of the timber passage hole 40. However, because of the inner peripheral surface, the impact is small, and the vibration and the accompanying noise are extremely small. Further, cushioning members 37a and 37b made of an elastic material such as an annular rubber are attached to the inner peripheral surface of the square material passage hole 40, and since the bearings 35a and 35b are interposed, each vertex 41 of the square material W is Even if a collision occurs, the cushioning members 37a and 37b are deformed in the radial direction so as to be able to absorb the collision, and the sleeves 36a and 36b forming the rectangular material passage hole 40 are provided.
Will rotate along with the timber W. As a result, the vibration and the accompanying noise are very low.

When the predetermined processing of the bar W is completed in this way, the bar W is released from the chuck 7, the bar W is fed again by the feed finger 8 until it hits a stopper (not shown), and the chuck 7 is closed again. Then, the processing is started again, and the same operation as described above is performed, so that the rotational runout of the square bar W is minimized.
Finally, when the processing of the square bar W is completed, the remaining material of the square bar W is removed from the feed finger 8. Thereafter, a new square bar W is dropped from the material shelf onto the bar feeder 1, and a new machining operation associated with the above-described operation is started. Thus, the timber W
Is continuously performed while minimizing the rotational runout of the square bar W.

In the above-described embodiment, the square bar W having a hexagonal cross section is used.
It can also be applied to square, octagon, and circular objects.

[0026]

As described above, the bar anti-sway device of the present invention has the following effects. 1. Rotational run-out caused by the rotation of the bar is limited to the range of the slight gap of the through hole formed by shifting the center of the two insertion holes,
Thereby, vibration can be reduced as much as possible and noise can be reduced. 2. The vibration generated by the rotation of the rod is deformed and absorbed in the radial direction by the cushioning member made of an elastic material such as an annular rubber, so that the vibration can be efficiently absorbed and the noise can be reduced. 3. Since the rod is prevented from swaying by the passage hole formed by shifting the center of the two insertion holes by the link mechanism, the structure is simple and inexpensive.

[Brief description of the drawings]

FIG. 1 is a front view of a bar feeder incorporating a bar steadying device according to the present invention, showing a state where the bar feeder is installed adjacent to an NC automatic lathe.

FIG. 2 is a front view of the bar steady rest device.

FIG. 3 is a perspective view showing a non-operating state of the bar steady rest device.

FIG. 4 is a side view showing a state at the time of operation of the bar steady rest device.

FIG. 5 is a sectional view taken along line XX of FIG. 3;

FIG. 6 is a diagram showing a relationship between hexagonal members and passage holes.

FIG. 7 is a view showing a conventional bar anti-sway device.

FIG. 8 is a view showing another conventional bar steady rest device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bar supply apparatus 2 Prop 3 NC automatic lathe 4 Bar anti-sway device 7 Chuck 8 Feed finger 11 Base 12 Bracket 12b Bar passage hole 13 Air cylinder 14 Piston rod 15 Cylinder piston mechanism 16 Shaft pin 17 Connecting lever 18 Shaft Pin 19 First lever 20 Second lever 21 Shaft pin 22 Link mechanism 24, 25 Shaft pin 30a First movable plate 30b Second movable plate 32a, 32b Bar insertion hole 33, 34 Support shaft 35a, 35b Bearing 36a, 36b Sleeve 37a, 37b buffer member 39 stopper mechanism 40 rectangular hole passage hole 41 apex 42 arc portion T maximum diameter W rectangular member

Claims (4)

[Claims] 1. A bar material steadying device provided at a tip of a bar material supply device, the device being fixed to a base of the bar material supply device,
A bracket having a rod passage hole, a cylinder piston mechanism fixed to the bracket, a link mechanism operated by the cylinder piston mechanism, and a rod material pivotally connected to the bracket and connected to the link mechanism, respectively; It comprises a pair of movable plates each having an insertion hole, and a stopper mechanism attached to the bracket to limit the operation amount of the link mechanism. When the link mechanism is not operated, the rod material is inserted into the pair of movable plates. The axes are aligned so that the holes overlap, and the axes of the bar insertion holes are deviated from each other by swinging the pair of movable plates when the link mechanism is operated. The bar material steadying device of the bar material supply device. 2. The link mechanism according to claim 1, further comprising: a pair of levers arranged in parallel, one end of each of the pair of levers pivotally connected to a corresponding end, and swingably attached to the bracket. 2. A bar-stabilizing device for a bar-feeding device according to claim 1, further comprising a connecting lever having one of said pair of levers connected to said cylinder piston mechanism. 3. The rod according to claim 1, wherein the rod insertion hole is a sleeve having a bearing interposed between the movable plate and a buffer member attached to an intermediate portion of the sleeve. Bar material steadying device for material supply device. 4. The apparatus according to claim 1, wherein the stopper mechanism is a screw member which can be adjusted with respect to the bracket, and wherein a screw tip abuts on a link mechanism.
4. The bar steadying device of the bar feeding device according to any one of items 1 to 3.