JPS6240723Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a resetting tool used to cut a groove in a round hole of a workpiece in a machine tool with an automatic tool exchange system, a so-called machining center.

(Prior art) Conventionally, the above-mentioned resetting tool attached to the rotating main shaft of the machine used presses the thrust surface of the tool against the end face of the workpiece, and performs cutting through a mechanism that converts axial force into radial direction. The cutting tool or part of the tool is made into a non-rotating member, and the rear end of this non-rotating member is brought into close contact with the non-rotating member of the machine being used, so that electrical signals or Tools have been developed in which the operating part of the tool is driven by the supply of fluid pressure to cause the cutting blade to cut.

(Problems to be Solved by the Present Invention) However, in the conventional examples described above, the performance as a resetting tool for machining centers is insufficient in some cases, and the structure is complex, considering the purpose of use. It was of excessive quality.

In view of the above, the present invention is capable of fully performing grooving, which is a relatively light cutting operation, and is structurally relatively simple, improving machining efficiency and reducing manufacturing costs. It was devised for the purpose of providing.

(Means for Solving the Problems) In order to achieve the above object, the present invention includes a tool body that can be freely fitted onto the rotating main shaft, a tool body that is slidably housed in the tool body, and a tool body that is slidably housed in the tool body and has a tip that faces forward. a plunger formed with a tapered surface that gradually becomes thinner, the rear surface of which is communicated with a pressure passage that can be freely opened and closed for sending pressure fluid, and urged rearward via a return spring; and a slide rail fixed to the front surface of the tool body. , a slide that is slidably fitted in the slide rail in a direction perpendicular to the axis of the tool body and that holds a cutting blade protruding forward; and a rotating roller that comes into contact with the tapered surface of the tip of the plunger; a roller receiver held in a position-adjustable manner relative to the slide; the roller receiver is biased by an elastic member in the sliding direction of the slide so that the rotating roller contacts the tapered surface; The plunger is advanced by sending pressure fluid to the pressure passage, and the tapered surface of the plunger moves the roller receiver in a direction perpendicular to the axis of the tool body through the roller, thereby moving the slide in the same direction. It was made to slide.

(Function) As the main shaft rotates, the cutting blade is rotated and advanced, and when it reaches a predetermined position, the passage to the rear surface of the plunger is opened and the cutting blade is closed by fluid pressure or the like. As the plunger moves forward, the roller receiver and the slide connected thereto are moved axially outward via the roller along the tapered surface formed at the tip of the plunger, and this movement causes the cutting tool to cut the workpiece. After cutting a groove in the round hole of The cutting depth is adjusted by moving the fixed position of the roller receiver to the slide in a direction perpendicular to the axis.

1 to 3 show one embodiment of the present invention, in which a tool body 2 is fitted to the head of a rotating main shaft 1 of a machine. A bracket 3 is fitted to this tool body 2 with a pair of main bearings 4 and a partition ring 5 interposed therebetween, and a front cap 6 and a rear cap 7 are fixed to both end faces of the bracket 3 with bolts. The tool body 2 is clamped so that it cannot be removed by a shaft nut 8 screwed to its tip, and this shaft nut 8 is prevented from loosening by a set screw screwed perpendicular to the axis.

The rear end of a slide rail 9 is fitted into the opening at the tip of the tool body 2, and the rail 9 is fixed to the tip of the tool body 2 with a bolt. Further, a plunger 10 is inserted into a cylinder portion with a center hole formed inside the tool body 2, with an O-ring 11 provided on the outer periphery of the piston, and the rear stage of the piston portion of the plunger 10 and the rear surface of the slide rail 9 are connected to each other. A return spring 12 is enclosed between the two and biased outwardly.

A wedge-shaped tapered surface 10a that gradually becomes thinner toward the front is formed on one side (lower side in FIG. 1) of the tip end portion of the plunger 10 that is inserted into the inner diameter of the slide rail 9. Tapered surface 1
A positioning key 13 is embedded on the opposite side of 0a (upper side in FIG. 1) to be slidably engaged in a keyway provided in the inner diameter of the slide rail 9.

A dovetail-shaped rail is formed on the front surface of the slide rail 9 so as to intersect with the axis, and the slide 14 is slidably fitted into this rail via an engaging portion 15, a plurality of setscrews 16, and a locking nut 17. equipped. A long hole 14' is bored in the front surface of the slide 14 in a direction perpendicular to the axis, as shown in FIG. The roller receiver 18 can be fixed at any position on the slide 14 by inserting the seat 19 into the threaded part 18a protruding outward and tightening the nut 20. It is configured.

A roller 21 that contacts the tapered surface 10a of the plunger 10 is rotatably supported at the upper end of the vertical part 18b of the roller receiver 18 via a pin 22, and in a blind hole bored in parallel at the lower end of the roller 21,
A compression spring 23 is inserted into each of the blind holes, and the open end of the blind hole is closed with a presser plate 24.

A screw hole is drilled in the horizontal portion 18a of the roller receiver 18 at right angles to its horizontal axis, and a dial screw 26 is inserted through a stepped hole drilled in the slide 14 concentrically with this screw hole. Screw into the screw hole above,
This dial screw 26 is clamped by an apron 25 bolted to the slide 14 so as not to be able to move up and down.
The fixing position of the roller receiver 18 to the slide 14 can be adjusted by rotating the roller receiver 18.

The proximal end of a cutting blade 27 protruding forward is inserted into the center hole of the front projection of the slide 14, and the cutting blade 27 is tightened with a plurality of setscrews 28.

A stepped hole is bored in the lower part of the bracket 3 parallel to the axis of the tool body 2, and a pressure transmission tube 29 is inserted into the small diameter portion of this stepped hole. A spring receiving shaft 30 is fitted into the inside of the 2 with an O-ring 30' interposed therebetween.
The collar parts 9 and 30 are overlapped and attached to the above bracket 3.
is bolted to. Further, a positioning tube 31 is fitted into the large diameter portion of the stepped hole. This positioning tube 31 is provided with a protrusion 31' that protrudes upward at right angles to its axis, and this protrusion 31' has a key shape and engages with a square groove 7' formed below the rear cap 7. When the tool body 2 is free, the square groove provided in the flange of the tool body 2 can also be fitted within the limited range of the limit screw 32 screwed onto the machine side of the bracket 3 by the spring 37 described later. They are also configured to engage and align with each other.

The rear end of the stepped portion of the positioning tube 31 is connected to the tool body 2.
When installed on the rotating main shaft 1 of the machine, it is configured to engage and press into the groove of the non-rotating pressure supply port 1' of the machine in use. A pusher 33 is inserted into the stepped portion of the positioning cylinder 31, and a steel ball 34 is built into its tip. is pressed against. In addition, the steel ball 34 of Pushya 33
Although not shown, a fluid escape groove is formed at the contact portion with the fluid.

As described above, the outer periphery of the large diameter part of the positioning cylinder 31 is slidably fitted into the inner periphery of the large diameter part of the stepped hole of the bracket 3, and the inner periphery is slidably fitted into the outer periphery of the pressure transmission cylinder 29. At the end of the large diameter hole above, there is a socket 36.
is inserted airtightly while holding the O-ring 36',
Further, a spring 37 is enclosed in the maximum inner diameter of the positioning cylinder 31 in pressure contact with the receiving plate 36.

Note that the fluid pressure from the non-rotating pressure supply port 1' of the machine in use is applied to the steel ball 3 which is pressurized and separated from the inner circumferential surface of the pusher 33.
4, the pressure transmission cylinder 29 and the spring receiving shaft 3
0, passes through the elongated hole 29' of the pressure transmission tube 29, through the pressure hole 3' of the bracket 3, through the pressure hole 5' drilled in the partition ring 5, and passes through the shaft formed inside the tool body 2. The pressure is transmitted to the back of the center hole cylinder portion through the pressure hole 2' extending in the direction, and is configured to press the rear surface of the plunger 10.

Next, the effect will be explained. When the resetting tool of the present invention is fitted to the rotating main shaft 1 of the machine using an automatic changer, the tool main body 2 and the bracket 3 are fitted so that the key-shaped part of the protruding part 31' of the positioning cylinder 31 is connected to the spring 37. Due to the elastic force and the restriction of the limit screw 32, both the groove 7' of the rear cap 7 and the groove of the main body 2 are engaged with each other, and the positions of the two in the rotational direction are constantly aligned. In this state, by press-fitting the positioning cylinder 31 into the rotating main shaft 1 of the machine in use, the left end of the positioning cylinder 31 is pressed into contact with the non-rotating pressure supply port 1' while compressing the spring 37, and the protruding part 31' is pressed into the groove of the main body 2. The bracket 3 is engaged only in the groove 7' of the rear cap 7, and even if the tool main body 2 rotates together with the rotating main shaft 1, the bracket 3 does not rotate. The entire tool advances toward the workpiece according to the program of the machine used, and when the blade of the cutting blade 27 reaches a predetermined position in the workpiece, fluid pressure such as hydraulic pressure or pneumatic pressure is applied from the pressure supply port 1' of the machine used. is supplied, presses the steel ball 34, compresses the spring 35, and releases the elongated hole 2 from the gap in the pressure transmission cylinder 29.
9', and the pressure hole 3' of the bracket 3 and the partition ring 5.
The plunger 10 is supplied deep into the cylinder portion through the pressure hole 5' of the main body 2 and the pressure hole 2' of the main body 2, and the plunger 10 moves forward while compressing the return spring 12. As a result, since the roller 21 is in contact with the tapered surface 10a of the shaft end of the plunger 10, the roller receiver 18 is pressed outward in the radial direction by a wedge action.
Only the slide 1 holding the slide 1 slides in the same direction, and the cutting blade 27 at its tip moves in a spiral shape to cut a groove in the workpiece. The depth of this cut is adjusted in advance with a dial screw 26, and when the cut reaches a predetermined depth, the supply of fluid pressure is stopped according to the program, and the plunger 10 is moved by the elasticity of the return spring 12. The steel ball 34 also comes into contact with the pusher 33 due to the repulsion of the spring 35, but a portion of the residual fluid that has lost pressure leaks out of the escape groove provided in the pusher and does not prevent the plunger 10 from moving back. When the grooving process is completed and the tool returns to its original position, the tool is removed from the spindle head 1 by the automatic exchange device of the machine used. 37, the key-shaped portion of the protruding end 31' engages and aligns both the groove 7' of the rear cap 7 and the groove of the main body 2.

(Effects of the invention) Since the present invention has the above-mentioned configuration, it can sufficiently perform grooving in a range that is considered relatively light cutting, and is relatively simple in structure and easy to process. By reducing the idle time other than the net cutting time, it is possible to improve machining efficiency and reduce manufacturing costs.

Furthermore, it has various advantages such as being able to be used in other machining center machines such as drills with coolant holes.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and Fig. 1 is a partially cutaway front view showing the state in which it is installed on a machine in use, and Fig. 2
The figure is a right side view of FIG. 1, and FIG. 3 is a view taken in the direction of arrow P in FIG. DESCRIPTION OF SYMBOLS 1...Rotation main shaft, 2...Tool body, 3...Bracket, 9...Slide rail, 10...Plunger, 10a...Tapered surface, 12...Return spring, 14...Slide, 18...Roller receive, 2
DESCRIPTION OF SYMBOLS 1... Roller, 23... Compression spring, 26... Screw with dial, 27... Cutting material, 29... Pressure transmission tube, 34... Steel ball.

Claims (1)

[Scope of utility model registration request] A tool body that can be freely fitted onto the rotating main shaft, and a pressure tool that is slidably housed within the tool body, has a tapered surface that gradually becomes thinner toward the front at the tip, and further sends pressure fluid to the rear surface that can be opened and closed. A plunger communicated with the passage and biased backward via a return spring, a slide rail fixed to the front surface of the tool body, and fitted into the slide rail so as to be slidable in a direction orthogonal to the axis of the tool body. and a slide that holds a cutting blade protruding forward, and a roller holder that supports a rotating roller that comes into contact with a tapered surface of the tip of the plunger and is held so that its position can be adjusted with respect to the slide. The receiver is biased by an elastic member in the sliding direction of the slide so that the rotating roller comes into contact with the tapered surface, and moves the plunger forward by sending the pressure fluid to the pressure passage, so that the tapered surface of the plunger moves forward. A resetting tool for a machining center, characterized in that the roller receiver is moved in a direction perpendicular to the axis of the tool body via a roller, thereby causing a slide to slide in the same direction.