JPS5930606A - Deep boring machine - Google Patents

Abstract

PURPOSE:To enable deep boring with the depth larger than one stroke of a boring bar to be effectively achieved by advancing the boring bar automatically. CONSTITUTION:The rear side of a boring bar is chucked in the power chuck 15 equipped on a main spindle head and is advanced by rotation, whereby boring operation is achieved. When the advance-stroke of the first boring operation is finished, the boring bar at the side of a power clamp mechanism is clamped, and the power chuck 15 is only retracted by unchucking it. Again, the rear side of the boring bar is also chucked and simultaneously the bar clamp mechanism is unclamped. The power chuck is moved forward by rotation driving for the second boring operation, whereby the boring bar is automatically advanced further.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a deep hole drilling machine, and more particularly to a deep hole drilling machine capable of machining a deep hole larger than the l stroke dimension of a boring bar.

[Technical background of the invention and its problems]

As a device for machining deep holes where the hole depth is larger than the hole diameter,
A hollow tubular serrated cutting tool is attached to the tip of a long and narrow hollow boring bar, and a high-pressure cutting agent is supplied near the outer periphery of the tip of the cutting tool, and chips are discharged along with the cutting agent through a passage inside the cutting tool and the boring bar, and the hole is drilled. Deep hole drilling machines for processing are known.

In a conventional deep hole drilling machine equipped with such a boring bar, the depth that can be drilled is the length of one stroke of the forward movement of the boring bar, and if it is necessary to drill a hole deeper than that, I either had to restart machining after adding a boring bar halfway through the process, or I had to use a deep hole drilling machine with a long stroke. Therefore, when adding a boring bar and restarting machining, setup time was required, the process was complicated, and work efficiency was poor. In addition, producing deep hole drilling metals with large strokes requires a larger deep hole drilling machine.
This also increases the production cost. Furthermore, in the method in which the headstock moves in the vertical direction, there is a limit to the stroke itself.

[Purpose of the invention]

The present invention has been made in consideration of these points.
It is an object of the present invention to provide a deep hole drilling machine that can fully automatically process a deep hole larger than the l stroke of a boring bar. is chucked by the power chuck installed on the spindle head and moved forward while rotating to drill the hole.When the power chuck moves to the forwardmost position and the first hole machining forward stroke is completed, the po link bar The bar is clamped by the park clamp mechanism placed on the front side of the boring bar, the power chuck is unchucked, only the power chuck is moved back, and the rear side of the boring bar is chucked again, and the park clamp mechanism is unclamped. This machine is characterized in that the boring bar can be fully automatically fed out by rotating the power chuck and moving it forward for the second hole drilling.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a front view of a deep hole drilling machine according to the present invention. In the figure, the symbol // is an elongated hollow boring bar with a polling tool attached to the tip, and a deep hole drilling machine 10.
Spindle head 12 located rearward in the longitudinal direction of
It is arranged from the inside to a position where the pressure table 13 placed at the front is inserted. The spindle head /2 is the main body base of the deep hole drilling machine 10 / along the boring bar // II! ! I
It is disposed so as to be able to reciprocate linearly in the I-line direction, and is equipped with a power chuck 7.5 that chucks and rotates the rear side of the boring bar l/. Reference numeral 16 is a motor for rotationally driving the power chuck IS, and its rotation is transmitted by pulleys 17&, /7b. Further, the symbol /l is a motor for moving the spindle head 6.degree.1 for reciprocating the spindle head '/2, and the symbol is a steady rest υ of the boring bar //.

FIG. 1 is a partial sectional view showing the internal structure of the spindle head/2. The hollow main shaft 20 with a chip discharge passage iq formed in the main shaft head 7.2 is rotatable! ! →N is supported by the main shaft, 2 (7 is the rear end of the rotary drive pulley/71
), but a power chuck IS for chucking the boring bar 75 is fixed to the front end. Also, the chip discharge passage/
9 is connected to a discharge path n formed in the discharge duct 2/,
ing.

The power chuck 15 is used to chuck and unchuck the hydraulic boring bar 1//, and is rotated together with the main shaft to transmit rotational force to the boring bar 1//. The power chuck 15 is arranged between a cylinder force that is rotatably held, a sleeve J that is movably inserted in the cylinder force in the axial direction, and a sleeve J that is fixed to the cylinder force. 1st
A first piston J fixed to the piston J and the sleeve J engages with the inner surface of the sleeve J by forming a full tapered surface,
The collet 27 is elastically deformed and fitted around the outer periphery of the boring bar. At the ends of the first piston J and the second piston, there is a chuck hydraulic circuit 2g that supplies pressure oil for the chucking operation, and an amplifier that supplies pressure oil for the unchucking operation. A chuck hydraulic circuit 9 is connected. The symbol JO is the drain circuit.

On the pressure table 13 side between the spindle head 12 and the pressure table 13, there is a park clamp mechanism 3/ for clamping or unclamping the front side of the boring bar //.
– is attached to. FIG. 3 is a thin sectional view of FIG. 1 showing the park clamp mechanism 3.

The park clamp t,: - structure 3/ has a pinion 3Y rotatably supported on the main body pace 1H, and for this pinion 32, a pair of racks, 3Ja, 3. B) are arranged parallel to each other in mesh. One rack? ,?
a is a hydraulic cylinder, ? tAK connected and linear reciprocating 11
The other rack, which is possible? ,? A bar 36 with two λ dogs JJR33b attached is connected to the rear of the bar 3b, and a limit switch 37 is installed parallel to the bar 3b.
eL, 37bf dog J5a, υON − by 3.3b
It is designed to obtain 0FF. Rack 33FL, 3
A clamping surface 3a and a clamping surface Jgb are attached to the tip of the clamping surface 3b in opposing relation to each other.
, 3 boring bars // are designed so that they can be completely clamped or unclamped.

Figure jQ a is a side sectional view of the pressure table 13 that supplies V1 abrasive with high JE to the vicinity of the outer periphery of the tip of the polling tool 3q 2). The pressure table /3 is attached to the main body base /'4 on the axially movable part, and the tip /? Attached to a is an annular sealing member that comes into contact with the machining f1)1 end face of the workpiece W to be deep-hole machined. The pressure table 13 is fully equipped with a pressure head having a pressure chamber 4Z/i into which a cutting agent such as cutting oil is supplied, and a boring bar 11 is inserted through the pressure chamber 4Z/i of the pressure head 2. There are 1. Cutting fluid is supplied to the pressure chamber Hiro/ from an external cutting fluid supply source (not shown), and this cutting fluid is supplied to the tip of the pressure table /3. The chips are injected into the machining hole of the workpiece W, are supplied to the tip of the cutting tool 3, near the outer periphery of the cutting tool 3, and are discharged to the rear along with chips through the passage inside the cutting tool 3 and the boring bar. The arrows in Fig. 1 indicate the flow of cutting fluid.Also, the main body base l.
It is attached to the vertical column 3 so that it can move up and down.

Next, the operation of this embodiment having such a configuration will be explained.

The spindle head/2'i is moved a predetermined distance in the direction orthogonal to the longitudinal direction of the deep hole drilling machine 10, and the boring bar//
The bar steady rest 2, the clamp mechanism 38 pressure table/3f can be inserted, and then the boring bar/1vil-
River by inserting it from the longitudinal direction? Set it to the l position. A cutting tool 3q corresponding to the hole diameter is attached to the tip of the boring bar l/. A boring bar for feeding out is set in the main spindle head L-1, which is being moved, by inserting the front end force/chip discharge passage/9f, and the axis of the main spindle head L-1 is aligned with the pressure table/3 again. After moving to the position where the boring bar is set, the rear end of the already set boring bar is connected to the feeding boring bar. This stirring/continuation can be done by screw connection. In this way, the polling tool 3q is attached to the tip, and the boring bar // to which the boring tool for feeding is added is set at the rear end.

Next, the tip of the pressure table 13/3a'i is brought into contact with the end surface of the workpiece W, and the rear side of the boring bar 11 is brought into contact with the power chuck 1! ; to check the pressure head inside the pressure table 13? The power chuck 15i is rotated while supplying cutting fluid from -2n to the vicinity of the tip of the cutting tool 39. This starts hole machining. At this time, the cryo mechanism 3/ is held at the unclamped position of the Ball Igbar//f. Moreover, the bar chuck operation by the power chuck/S is performed by supplying pressure oil from the chuck hydraulic circuit 2g and moving the sleeve 21Ak to the left in FIG. At this time, the second piston 26 also moves to the left, increasing the pressing force on the collet 27 by the sleeve J. Hole machining is performed by moving the spindle head/2 forward in the direction of the full pressure table 13 while rotating the power chuck/3f, and when the spindle head reaches its forward movement limit, the first cutting begins. Completed.

The forward movement limit of the spindle head 12 is detected when the spindle head 12 comes into contact with a limit switch (not shown) installed on the main body base/IA (71), and this detection signal causes the forward movement of the spindle head 12 to be At the same time, the rotation of the power chuck 15 is also stopped.

Subsequently, the hydraulic cylinder 31A (Fig. 3) is operated to move racks ?, ?a upward, and move the other racks ?, 7
In cooperation with b, bowling bar l/rough 2 hoop surface 3 a.

Clamp with 3 za b. This park clamp operation is detected by the limit switches 37a and 37b, and pressure oil is supplied to the unchuck hydraulic circuit 29 of the power chuck/j5 based on this detection signal. The second piston moves to the right in FIG. 2 by the same pressure, and the sleeve J also moves to the right together with the second piston.) The chuck operation by the collet 27 is released, and the power chuck 13 is brought into an unchucked state. The fact that the power chuck tS has become unchucked is detected by the pressure gauge in the hydraulic circuit 2 or 29, for example, and then the spindle head 12 moves backward in the opposite direction to the pressure table 13, and the spindle head/ The boring bar for feeding in 2 is fed out from the spindle head 12. After the spindle head 12 has retreated to its original position, the power chuck 13 performs the chuck operation again, and the clamp mechanism 31 is brought into an unclamped state by the operation of the hydraulic cylinder 31t. In this state, the power chuck 1.5 is subsequently driven to rotate, the spindle head/2 is moved forward, and the second deep hole drilling process is performed. In this way, deep hole drilling is automatically performed over λ stages, and a deep hole with a dimension larger than the first l stroke of the spindle head is completed. Move back with the boring bar // chucked, then clamp the boring bar /l by the clamp mechanism 3/,
With the power chuck 15 in an unchucked state, the spindle head moves forward. As a result, the part of the boring bar for feeding is inserted into the spindle head/2, and by re-chucking the boring bar and unclamping the clamping mechanism 3/2, moving the spindle head 72 backward, the boring bar returns to the initially set position. Then, the series of deep hole drilling process is completed. Note that these series of operations are appropriately controlled using general sequence technology. 'T! Movement of the spindle head other than cutting feed is necessary to increase work efficiency.
This is done by fast forwarding motion.

〔Effect of the invention〕

As explained above, according to the present invention, it is possible to machine a deep hole by fully automatically feeding out a boring bar, and it is possible to efficiently machine a deep hole with dimensions larger than 1 stroke of the boring bar. I can do it.

Further, since the boring bar can be added during drilling by screw connection or the like, it is possible to obtain a boring bar of a required length depending on the size of the deep hole. In this example, the cutting feed was explained in kλ stages, but
It is also possible to perform all three or more stages of feeding operations.

[Brief explanation of drawings]

Figure 1 shows the front view of the deep hole drilling machine according to the present invention, and the
The figure is a side sectional view of the spindle head, FIG. 3 is a sectional view taken along the line 1-1 in FIG. Bar, /J...Spindle head, 1
3...Pressure table, 15...Power chuck, 3/...
...) Ku-clamp mechanism, 3q...poling tool, Hiroko...pressure head.

Claims (1)

[Claims] 1. An elongated boring bar with a polling tool attached to the tip; a trap capable of moving back and forth in a straight line relative to the workpiece is disposed behind the main body pace, and chucks the rear side of the boring bar. a spindle head equipped with a power chuck that is rotationally driven by the spindle; a pressure unit that is arranged in front of the main body base and supplies high-pressure cutting fluid to the vicinity of the outer periphery of the tip of the polling tool; and a pressure unit that is arranged between the spindle head and the pressure unit. and a park clamp mechanism that clamps or unclamps the tip of the boring bar; while the power chuck K and the park clamp mechanism are performing a clamping operation, the power chuck K and the park clamp mechanism are moved backward in an unchucking state, and the unclamping operation is performed. A deep hole drilling machine equipped with a control system that rotates and drives in a chucked state while drilling. 2. A deep hole drilling machine as claimed in claim 1, wherein the shibower chuck is hydraulically driven. 3. The deep hole drilling machine according to claim 1, wherein the park clamp mechanism is driven by a hydraulic cylinder.