JP4177742B2 - Gun drill machine - Google Patents

Description

  The present invention relates to a gun drill machine used for machining a small-diameter deep hole.

  Conventionally, when drilling a small-diameter deep hole in a workpiece, a gun drill machine is used. The gun drill machine is configured to be able to rotate by attaching a long drill called a gun drill to a spindle of a headstock, and to move in the axial direction of the gun drill by advancing and retracting the headstock. The longer the deep hole, the longer the gun drill will be, resulting in a decrease in the gun drill stiffness. When a thrust that is a cutting force is applied to the gun drill, the gun drill buckles and breaks. In order to prevent such buckling and breakage, a steady rest device is provided. This steady rest device suppresses run-out, prevents buckling and breakage, and enables highly accurate deep drilling.

  FIG. 7 is a front view showing a conventional gun drill machine 20. As shown in FIG. 7, a feeding unit 22 is placed on the upper right side of the base 21. The feed unit 22 has a slide guide, and the slide 23 is guided by the slide guide so as to be slidable in the Z-axis (left-right) direction. A servo motor 24 is disposed at the right end of the base 21, and a slide 23 is slidable in the left-right direction by a ball screw (not shown) directly connected to the motor shaft of the servo motor 24. A spindle stock 30 is placed on the slide 23, and a spindle 36 of the spindle stock 30 is rotated by a spindle motor 31 disposed above the spindle stock 30 via a pulley 32 and a belt 33. The

  The base body 21 has a rectangular shape and is arranged in the left-right direction. A mounting tool 41 such as a base or a scale is placed on the upper left of the base 21 and a workpiece 42 is fixed by a clamper (not shown). On the right side of the workpiece 42, a chip box 50 for discharging chips by a gun drill is arranged. A guide plate 51 is mounted on the left side surface of the chip box 50, and a guide bush 52 matching the diameter of the gun drill 37 is fitted into the guide plate 51 so that the guide box 51 can be exchanged for each size. The guide bush 52 serves as a guide that prevents the blade tip of the gun drill 37 from starting to bite against the workpiece 42. Then, the chips cut by the cutting edge of the gun drill 37 are supplied with high-pressure cutting oil to the cutting edge by an oil supply pump (not shown) via a rotary oil supply device 35 disposed at the rear part of the spindle 36 of the headstock 30. Chips are discharged to the chip box 50 through the grooves formed on the outer periphery of the gun drill 37 by the high-pressure cutting oil.

FIG. 8 is an enlarged view of the conventional steady rest device 11, FIG. 8 (a) is a sectional view showing a state before processing, and FIG. 8 (b) is a sectional view showing a state after processing.
As shown in FIG. 8A, the conventional steady rest device 11 is disposed between the chip box 50 and the headstock 30 (see FIG. 7). The steady rest device 11 is constituted by guide bars 13 and 13 that serve as guides when the steady rest main body 12 is moved to the left and right and are moving members of the steady rest device. A steady stop bush 15 for stopping the swing of the gun drill 37 is fitted into the steady rest body 12, and the steady rest device 11 also moves forward as the headstock 30 advances (see, for example, Patent Document 1).
JP 2001-105215 A ([0013] to [0025], FIG. 1, FIG. 2, FIG. 3)

However, as shown in FIG. 8B, when the headstock 30 (see FIG. 7) moves forward, the steady rest body 12 stops before the tip box 50. Further, the spindle 36 of the head stock 30 stops before the steady rest body 12. At this time, assuming that the overall length of the blade portion of the gun drill 37 is L2, the processing depth of the workpiece (workpiece) is L3, and the other lengths are L5, the processing depth L3 occupying the total length L2 of the gun drill 37 is about half of 52. The other length L5, which does not contribute to machining, accounted for 48% of the entire gun drill 37.
That is, there is a problem that the gun drill 37 that requires twice as long as the machining length has to be procured, which is quite uneconomical. Further, in addition to the cost increase due to the lengthening of the gun drill 37, the processing conditions have to be reduced, so that there are problems such as a reduction in processing efficiency.

  Therefore, the present invention has been developed to solve these problems, and improves the ratio of the processing length of the workpiece (workpiece) to the total length of the gun drill and reduces the length of the gun drill. It is an object of the present invention to provide a steady rest device for a gun drill machine capable of improving efficiency and reducing costs.

The invention according to claim 1 is a rectangular base body arranged in the left-right direction, a feed unit slidable in the left-right (Z-axis) direction placed on one side of the base body, and the feed unit A headstock for freely rotating a gun drill placed on the base, a fixture to which a workpiece placed on the other of the base is fixed, and between the headstock and the fixture A gun drill machine provided with a chip box for discharging chips disposed on the backrest and a steady rest device for stopping the swing of the gun drill,
The steadying arm of the steadying main body of the steadying device is inserted through the upper opening of the tip box and is configured to stop the gun drill from swinging.

  According to the invention described in claim 1, since the region in the tip box can be used effectively by inserting the steadying arm of the steadying device into the tip box from the upper opening, the work to occupy the entire length of the gun drill Gun drill machine steady rest device that can greatly improve the work length ratio of the workpiece (work) to 70% or more and increase the rigidity by shortening the gun drill, improving machining efficiency, accuracy and cost reduction Can be provided.

  The invention according to claim 2 is the gun drill machine according to claim 1, wherein a spindle of the headstock enters a side opening of the tip box.

  According to the second aspect of the present invention, since the shaft end of the spindle of the headstock can enter the tip box through the side opening so as to be able to advance and retreat, the shaft end of the spindle can approach the workpiece end. Can do.

  A third aspect of the present invention is the gun drill machine according to the second aspect, wherein the spindle is supported by a spindle bush provided in a side opening of the tip box.

  According to the third aspect of the present invention, the spindle bushing is provided in the side opening of the chip box, so that the spindle can be prevented from being lowered and the vibration can be absorbed. The influence on can be suppressed.

  According to a fourth aspect of the present invention, in the gun drill machine according to the first aspect, the moving member of the steady rest device is provided on a top cover of the chip box.

  According to the fourth aspect of the present invention, since the movable member of the steady rest device is provided on the upper portion of the chip box, the gun drill can be shortened because it can approach the workpiece.

  A fifth aspect of the present invention is the gun drill machine according to the first aspect, wherein the upper opening of the tip box is covered with a plurality of slide covers.

  According to the invention described in claim 5, by providing a plurality of slide covers in the upper opening that is opened in order to insert the steadying arm of the steadying main body from the upper opening and move the steadying arm. It is possible to prevent chips and cutting oil from scattering.

  According to the invention described in claim 1, since the region in the tip box can be used effectively by inserting the steadying arm of the steadying device into the tip box from the upper opening, the work to occupy the entire length of the gun drill The ratio of the processing length of an object (work) can be greatly improved, and the rigidity is increased by shortening the gun drill, so that it is possible to provide a steadying device for a gun drill machine that can improve processing efficiency and reduce costs.

  According to the second aspect of the present invention, since the shaft end of the spindle of the headstock is made to enter the side opening of the chip box so that the shaft end of the spindle can approach the workpiece end, the gun drill can be shortened.

  According to the invention described in claim 3, since the spindle bush can be prevented from being lowered by providing the spindle bush at the side opening of the chip box, the eccentricity of the gun drill can be suppressed and the influence on the life can be suppressed. it can.

  According to the fourth aspect of the present invention, since the steadying arm can be brought close to the workpiece by providing the moving member of the steadying device at the top of the chip box, the gun drill can be shortened. it can.

  According to the fifth aspect of the present invention, a plurality of slide covers are provided in the upper opening for passing the steady rest main body through the upper opening and moving the steady rest arm. Can be prevented.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a front view showing the entire gun drill machine 10. 7 differs from the conventional gun drill machine 20 shown in FIG. 7 in that the configuration of the steady rest device 1, the shape of the spindle 6, the overall length of the gun drill 7, and the configuration of the tip box 5 are substantially the same. Since it is a structure, the same code | symbol is attached | subjected to the same site | part and description is abbreviate | omitted.
Hereinafter, the steady rest device 1, the spindle 6, the gun drill 7, and the tip box 5 will be described with emphasis. As shown in FIG. 1, the spindle 6 protrudes greatly from the headstock 30 and is supported by a spindle bush 9 provided on the side surface of the chip box 5. (See FIG. 3) When the spindle 6 starts to be cut, the spindle 6 is caused to enter the spindle bush 9 provided in the side opening of the chip box 5.
The spindle bush 9 may be omitted, and the spindle 6 may enter the chip box 5 from the side opening.

  FIG. 2 is an enlarged plan view of the steady rest device 1 shown in FIG. As shown in FIG. 2, the moving member of the steadying device 1 is disposed on the top cover 5 a of the chip box 5. Blocks 5c and 5c are welded to the upper surface of the top cover 5a, and guide bars 3 and 3 are disposed on both sides of the block 5c, respectively. A steady-rest main body 2 is mounted on the guide bars 3 and 3 via bushes 2b and 2b that are slidably fitted. A bar 4b holding a coil spring 4a is connected to the steady rest body 2 on the right block 5c, and the steady rest body 2 is constantly biased toward the headstock 30 by the biasing force of the coil spring 4a.

  3 is a cross-sectional view taken along line XX shown in FIG. As shown in FIG. 3, the chip box 5 is wider and more stable than the conventional chip box 50 (see FIG. 7), and the top cover 5a on the upper surface of the chip box 5 is provided with an opening 5b. The steadying arm 2c is inserted into the chip box 5 through the opening 5b. A spindle bush 9 is provided on the main shaft side (right side in the figure) of the chip box 5 to support the spindle 6 so as to be slidable. A gun drill 7 is fixed to the tip of the spindle 6. The tip of the gun drill 7 is supported by a guide bush 5e fitted in the guide plate 5d. In this way, the intermediate position of the gun drill 7 supported at both ends is supported by the steady bush 2 a fitted into the tip of the steady arm 2 c extended from the steady body 2.

  4 is a left side view of the steady rest device 1 shown in FIG. As shown in FIG. 4, the steady rest device 1 is formed in a T-shape, and the upper part is penetrated by two guide bars 3 and 3 at both the left and right ends, and the bar 4b is connected at the center of the upper part. Further, an anti-sway bush 2a is fitted into the tip of the T-shaped lower anti-sway arm 2c. Further, guides 8 are connected to the lower surface of the opening 5b, and two upper slide covers 8a and two lower slide covers 8b are stored on the convex portion 8p of the guide 8 so as to overlap each other. The two slide covers 8a and 8b prevent scattering of chips and cutting oil.

  FIG. 5 is a cross-sectional view taken along line YY of the steady rest device 1 shown in FIG. The steady rest 2 of the steady rest 1 is pressed by the push rod 14 in accordance with the movement of the headstock 30 (see FIG. 1), and the position of the steady stop 2a of the steady rest 2 is changed. . Further, the spindle 6 of the head stock 30 penetrates deeply into the chip box 5 while being supported by the spindle bush 9 and approaches the steadying arm 2c.

Here, the operation of the steady rest device 1 will be described with reference to the drawings.
As shown in FIG. 1, a fixture 41 is placed on the upper left of the base 21 and a workpiece 42 is fixed. As shown in FIG. 3, the steady rest bush 2a and the guide plate 5d (only the guide bush 5e can be used) are exchanged according to the diameter of the processed hole of the workpiece 42, and the optimum length is obtained from the depth of the processed hole of the workpiece 42. Replace the gun drill 7
When the start button of the spindle 6 of the headstock 30 is pressed and turned on, the main shaft motor 31 starts and starts rotating, and power is transmitted from the pulley 32 on the motor 31 side to the belt 33 and from the belt 33 to the pulley 32 on the headstock 30 side. The gun drill 7 transmitted to the spindle 6 of the headstock 30 is rotated. Further, a high-pressure cutting oil is supplied to the cutting edge by a rotary oiling device 35 connected to the rear part of the spindle 6, and is discharged to the chip box 5 through a groove formed on the outer periphery of the gun drill 7 while cooling and lubricating the cutting edge. .
When the servo motor 24 of the feed unit 22 is activated and cutting feed enters the slide 23, the spindle 6 fitted and supported by the spindle bush 9 starts to enter the chip box 5 as shown in FIG. . Further, the tip of the gun drill 7 is supported by the guide bush 5e to suppress unstable behavior at the start of cutting.
The midpoint of the gun drill 7 is supported by a steady bush 2a of a steady arm 2c inserted from the upper opening of the tip box 5, and this steady arm 2c is pressed against the push rod 14 in accordance with the movement of the headstock 30. While being changed, the position is changed and the gun drill 7 is supported.
The cutting edge of the gun drill 7 is cooled by high-pressure cutting oil, and the generated chips are discharged to the chip box 5 by the high-pressure cutting oil.
Furthermore, the opening 5b of the chip box 5 is covered with two slide covers 8a and 8b, and the deep drilling process is completed while preventing the scattering of the cutting oil.

Further, the conventional gun drill 37 (see FIG. 7) and the gun drill 7 of the present invention (see FIG. 1) will be compared and verified to explain the effects. As shown in FIG. 8B, the gun drill 37 in the conventional gun drill machine 20 has, for example, L2 = 247 mm, L3 = 130 mm, and L5 = 117 mm. Therefore, the necessary cutting edge length with respect to the entire cutting edge length is 52%. (L3 / L2 = 0.52).
On the other hand, the gun drill 7 in the gun drill machine 10 shown in FIG. 1 has, for example, L1 = 167 mm, L3 = 130 mm, and L4 = 37 mm as shown in FIG. 78% (L3 / L1 = 0.78). As a result, the processing depth L3 of the workpiece (workpiece) occupying the entire length L1 is 78%, which is greatly improved.
As described above, the gun drill 7 that has conventionally required a length twice as long as the machining length can be obtained by procuring the gun drill 7 having a length 1.3 times longer, and the cost of the gun drill 37 can be reduced by 33%. is there. In addition, along with the increase in rigidity due to the shortening of the gun drill 7, there are operational effects such as improvement in machining efficiency by reviewing the machining conditions.

6 shows the configuration and movement of the slide cover, FIG. 6 (a) is a plan view showing a state before processing, and FIG. 6 (b) is a cross-sectional view taken along line AA shown in FIG. (C) is a top view which shows the state after a process, FIG.6 (d) is sectional drawing of the BB line shown to (c).
As shown in FIGS. 6A and 6B, the upper slide cover 8a has a flat plate shape and is provided with a square hole 8k through the steady arm 2c of the steady body 2 at the center. , Convex portions 8c and 8d having a hooking function are provided. Further, the lower slide cover 8b is formed in a substantially U shape in plan view, and the right side in the drawing is open, and an opening 8i is formed so that the steady arm 2c can move, and a step is formed on the upper surface. A portion 8e is provided, and a convex portion 8f having a catching function is provided at the tip of the back surface.

Here, operations of the upper slide cover 8a and the lower slide cover 8b will be described with reference to the drawings. As shown in FIGS. 6 (a) and 6 (b), before deep hole processing, the two protruding portions 8c of the upper slide cover 8a are overlapped with the stepped portion 8e of the lower slide cover 8b, and the wobbling occurs. The two slide covers 8a and 8b are opened by the retraction of the stop arm 2c and cover the opening 5b.
Once deep hole machining is started, the steady rest body 2 is pressed as the headstock 30 advances and starts to advance, and advances together with the upper slide cover 8a.
When the steady rest arm 2c comes into contact with the left end 8g of the opening 8i of the lower slide cover 8b, this time the upper slide cover 8a and the lower slide cover 8b are advanced together to the vicinity of the left end of the opening 5b of the chip box 5. After continuing to move, stop with a stroke margin.
The stroke amount here is S.
After the processing, as shown in FIGS. 6C and 6D, as the headstock 30 retreats, the steady rest body 2 starts retreating and retreats together with the upper slide cover 8a, and the upper slide cover 8a When the convex portion 8c reaches the stepped portion 8e of the lower slide cover 8b and is caught, the lower slide cover 8b starts to retract together, and the convex portion 8f of the lower slide cover 8b reaches the end portion 8h of the guide 8. The two slide covers 8a and 8b are returned to their original positions and stopped.
As shown in FIG. 6A, the rear end portion (right side in the drawing) of the upper slide cover 8a has a 45 ° inclined surface 8o, and the rear end portion (right side in the drawing) of the lower slide cover 8b is also formed. A 45 ° inclined surface 8j is formed. Thereby, the upper slide cover 8a can sweep away chips on the ceiling surface. The lower slide cover 8b can sweep out chips adhering to the back surface of the upper slide cover 8a by the inclined surface 8j.

  The present invention can be modified and changed in various ways within the scope of the technical idea. For example, although the gun drill machine of the present invention uses workpiece fixation and tool rotation, it may also be workpiece rotation and tool fixation.

It is a front view showing the whole gun drill machine of the present invention. It is an enlarged plan view of the steady rest device shown in FIG. It is sectional drawing of the XX line shown in FIG. FIG. 4 is a left side view, partly broken, of the steady rest device 1 shown in FIG. 3. It is sectional drawing of the YY line of the steadying apparatus shown in FIG. The structure of a slide cover is shown, (a) is a top view which shows the state before a process, (b) is sectional drawing of the AA line shown to (a), (c) is a plane which shows the state after a process. FIG. 4D is a cross-sectional view taken along line BB shown in FIG. It is a front view which shows the conventional gun drill machine. It is an enlarged view of the conventional steady rest apparatus, (a) is sectional drawing which shows the state before a process, (b) is sectional drawing which shows the state after a process.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,11 Stabilizing device 2,12 Stabilizing body 2a Stabilizing bush 2b Bushing 2c Stabilizing arm 3,13 Guide bar 4a Coil spring 4b Bar 5,50 Tip box 5a, 50a Top cover 5b Opening 5c Block 5d Guide plate 5e Guide bush 6, 36 Spindle 7, 37 Gun drill 8 Guide 8a Upper slide cover 8b Lower slide cover 8c, 8d, 8f, 8p Convex part 8e Step part 8g Left end 8h End part 8i Opening part 8j, 8o Inclined surface 8k Square hole 9 Spindle Bush 10, 20 Gun drill machine 14 Push rod

Claims (5)

A rectangular base body arranged in the left-right direction, a feed unit slidable in the left-right (Z-axis) direction placed on one side of the base body, and a gun drill placed on the feed unit A headstock that rotates freely, a fixture that fixes a workpiece placed on the other of the base, and chips disposed between the headstock and the fixture are discharged. A gun drill machine provided with a tip box and a steadying device for stopping the deflection of the gun drill,
A gun drill machine characterized in that a steady arm of a steady body of the steady device is inserted from an upper opening of the tip box to stop the gun drill from swinging.   The gun drill machine according to claim 1, wherein a spindle of the headstock enters a side opening of the chip box.   The gun drill machine according to claim 2, wherein the spindle is supported by a spindle bush provided in a side opening of the chip box.   The gun drill machine according to claim 1, wherein the moving member of the steady rest device is provided on a top cover of the chip box.   The gun drill machine according to claim 1, wherein an upper opening of the chip box is covered with a plurality of slide covers.

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