JPH0890307A - Tool holding device of turning center - Google Patents

Abstract

PURPOSE: To provide a tool holding device of a turning center that is able to prevent any cutting main component force from acting on a bearing supporting a ram and a spindle in time of turning work, while automatically rotating plural pieces of cutting tools attached to a cutter holding part of a turning tool, capable of turning each of works successively, and making it fittable in each taper shank of a rotary tool and the turning tool. CONSTITUTION: A bearing 3 is interposed between a spindle 2 and a ram 4, and when a rotary tool is used, this interposition is released as well as when a turning tool (b) is used, a clamp means 5 fixing the spindle 2 in the radial direction is installed there free of release, and plural pieces of cutting tools 62 are projectingly installed in a cutter holding part 61 of this turning tool (b), then an indexing control mechanism turning the spindle 2 as far as the specified angle and a clamping mechanism clamping the spindle 2 to the ram 4 at that position both are installed in a machine body.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tool mounting device for a turning center.

[0002]

2. Description of the Related Art A tool mounting device for a turning center capable of exchanging a rotary tool a and a turning tool b is frequently used. Turning of the tool mounting device for a turning center of this conventional example The work requires much larger cutting ability than the milling work such as the drilling work and the tap work, and when the work W is cut out from the black skin state, a cutting force accompanied by continuous impact is generated. Since the main component of the cutting force of is directly applied to the bearing 3 via the main shaft 2, the accuracy is often deteriorated,
At times, the bearing 3 was damaged.

In order to solve the above-mentioned drawbacks, the applicant has developed a turning center tool mounting device in which a clamping means 5 for fixing the spindle 2 in the radial direction is detachably provided when the cutting tool b is used. I applied for a tool mounting device for a turning center of No. 6-165127.

The applicant subsequently conducted further research in order to improve the working efficiency of the turning center equipped with the clamping means 5, in order to improve the working efficiency of the turning tool b. 62 are projected at predetermined intervals, and the index control mechanism 63 rotates the main shaft 2 at a predetermined angle to fix the cutting blade 62 having a desired blade shape attached to the blade holder 61 at a predetermined position. By carrying out a turning operation, the present invention is constructed in which the cutting blade 62 having a desired blade shape is rotated one after another in each step without damaging the bearing 3.

[0005]

The gist of the present invention will be described with reference to the accompanying drawings.

Spindle 2 for holding a tapered shank 1 of a tool
Is rotatably provided with a bearing 3 interposed between the ram 4 and the ram 4. When the rotary tool a is used, it is released to make the main spindle 2 rotatable, and when the turning tool b is used, the main spindle 2 is moved in the radial direction. The clamping means 5 for fixing is provided so as to be able to be released and fixed, and a plurality of different cutting blades 62 are projected around the blade holding portion 61 of the turning tool b at predetermined intervals, and when the turning tool b is used, A tool mounting device for a turning center, characterized in that an indexing control mechanism 63 for controlling rotation of the spindle 2 by a predetermined angle and a fixing mechanism 64 for fixing the spindle 2 to the ram 4 at the indexing position are provided in the machine body A. It is related.

[0007]

The taper shank 1 of the rotary tool a is fitted in the taper hole 2'of the spindle 2, the clamp means 5 and the fixing mechanism 64 are released, and the spindle 2 is rotated by the conventional means through the bearing 3 for rotation. The work a is drilled and tapped with the tool a.

When performing a turning operation, the rotary tool a is extracted from the main spindle 2, the taper shank 1 of the turning tool b is fitted into the taper hole 2'of the main spindle 2, and the main spindle 2 is rotated by a predetermined angle by the indexing control mechanism 63. One cutting blade 62 having a desired shape among the plurality of cutting blades 62 that are moved to be attached around the blade holding portion 61 is rotated to a predetermined position, and the fixing mechanism 64 is operated at the indexing position. After fixing the main spindle 2 to the ram 4, the clamping means 5 is actuated to fix the main spindle 2 in the radial direction, and the ram 4 is lowered so that the cutting force is not directly applied to the bearing 3 and the work piece 1 is used as the cutting tool 62. Carry out the turning operation of the relevant part of W.

When the work of cutting the part of the work W with the first cutting tool 62 is completed, the ram 4 is raised, the clamp means 5 and the fixing mechanism 64 are released, and then the indexing control mechanism 63 is again provided.
The main shaft 2 is rotated by a predetermined angle with respect to the ram 4 to rotate the cutting blade 62 of the second to a predetermined position, and the fixing mechanism 64 is operated to fix the main shaft 2 to the ram 4 at that position. And the work W is cut by the second cutting blade 62.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The attached drawings show an example of a preferred embodiment of the present invention, in which a spindle 2 for holding a taper shank 1 of a tool.
Is rotatably provided with a bearing 3 interposed between the ram 4 and the ram 4. When the rotary tool a is used, it is released to make the main spindle 2 rotatable, and when the turning tool b is used, the main spindle 2 is moved in the radial direction. The clamp means 5 for fixing is provided so as to be released and fixed.

[0011] the bottom of the ram 4 in and out while being guided by the tool rest 51, and fitted into the housing sleeve 10 having a flange portion 10 ₁ at the lower end, ball bearings and roller bearings on the upper and lower side of the inner diameter of the housing sleeve 10 the bearing 3 of adopting attached to upper and lower stages, and fixed housing sleeve 10, a sleeve cap 11 into ram 4 in fastening bolts 12 by a sleeve cap 11 is provided on the lower end surface of the flange portion 10 ₁ of the housing sleeve 10. A main shaft 2 having a flange portion 2 ″ near the lower end is fitted inside the bearing 3 and the main shaft 2 is rotatably provided with respect to a ram 4 via the bearing 3, and a rotary tool a or a turning tool is provided at the lower end of the main shaft 2. b
The taper shank 1 is provided with a tapered hole 2 '.

A housing cap 13 is fitted on the lower surface of the flange portion 2 "of the main shaft 2 and fixed to the sleeve cap 11 with a fixing bolt 19.

On the outer periphery of the upper end and the outer periphery of the lower end of the flange portion 2 "of the main shaft 2, taper bearing surfaces 6, 6'having a smaller diameter toward the upper side and the lower side are provided in a vertically opposed manner, respectively.
Stepped portions 11 'and 13' are provided on the inner diameters of the sleeve cap 11 and the housing cap 13, and opposed taper bearing surfaces 7 and 7 'that face the tapered bearing surfaces 6 and 6'are provided inside the stepped portions 11' and 13 '. The opposite cylindrical body 9 formed on the circumference is tightly fitted, and the taper bearing surface 6
Cylindrical taper body 8 having a tapered bearing surface that engages between the bearing surface and the opposite bearing surface 7, and a short cylinder having a bearing surface that engages the lower tapered bearing surface 6'and the opposite bearing surface 7 ' The taper ring body 8 ′ is provided in a vertically opposed state.

Reference numerals 27 and 28 in the figure denote spacers for setting the upper and lower positions of the opposed cylindrical body 9 with respect to the sleeve cap 11 and the housing cap 13.

A head of a piston head 14 in which a plurality of piston fitting holes 11 ₁ are concentrically formed in a flange portion of the sleeve cap 11 at equal intervals, and a piston rod 14 ′ is vertically provided in the piston fitting holes 11 _1. Part is slidably fitted, the sliding piston 15 is fitted in the piston fitting hole 11 ₁ below the piston head 14, and the piston rod 14 ′ is slidably inserted into the sliding piston 15, The lower end of the piston rod 14 ', which protrudes downward from the piston 15 and penetrates through the holes of the upper and lower taper ring bodies 8 and 8', projects downward to face the upper and lower taper ring bodies 8 and 8 '. Anti-shrink elastic body 16 on piston rod 14 'between planes (in the embodiment, a plurality of disc springs are superposed to form a set of anti-shrink elastic body 16)
Then, the adjusting nut 17 is screwed onto the projecting end of the piston rod 14 'to compress the upper and lower taper ring bodies 8 and 8', and urge and fix them in a repulsive state. A fluid pressure pipe 18 for sending hydraulic pressure is vertically provided on the outer shape of the ram body 4, and the lower end of the fluid pressure pipe 18 is communicated with the piston fitting hole 11 _1. This fluid pressure pipe 18, piston fitting hole 11 ₁ , piston head 14, piston Rod 14 '
The sliding piston 15, the anti-shrink elastic body 16, and the upper and lower taper ring bodies 8 and 8'constitute the clamp means 5 for fixing the main shaft 2 in the ram 4 via the opposed cylindrical body 9.

In the figure, reference numeral 20 is a piston packing of the piston head 14, 21 is a piston packing of the sliding piston 15, and 22 and 23 are O-rings.

An end surface key 54 with which the key groove 55 of the rotary tool a or the turning tool b engages is provided on the lower end surface of the spindle 2.

A plurality of different cutting blades 62 are provided around the blade holding portion 61 of the turning tool b at predetermined intervals, and when the turning tool b is used, the spindle 2 is controlled to rotate by a predetermined angle. The machine body A is provided with an indexing control mechanism 63 for fixing and a fixing mechanism 64 for fixing the spindle 2 to the ram 4 at this indexing position.

The illustrated indexing control mechanism 63 and fixing mechanism 64
Will be described.

A plurality of cutting knives 62 having different kinds of knives are projected at predetermined intervals around the knives holder 61 of the turning tool b with the end surface key 54 attached to the main shaft 2 as a base point, A fitting recess is provided in the outer peripheral portion of the main shaft 2 corresponding to the predetermined spacing position, and the locking fixing body 66 is fitted into the fitting concave and fixed by a fastening bolt 70, and is engaged with the central portion of the locking fixing body 66. A stop taper hole 68 is drilled.

A locking engagement hole 71 is bored in the housing sleeve 10 and the ram 4 at a position facing the locking fixed body 66 and located on the base point of the end face key 54 of the main shaft 2 when viewed from directly above. The engagement cylinder 72 is fitted into the stop engagement hole 71, the flange portion of the engagement cylinder 72 is fixed to the ram 4 with the fixing bolt 73 and the taper pin 73 ′, and the center portion of the engagement cylinder 72 is perforated. Piston body in the sliding hole
74 is slidably fitted, and a projecting rod 74 'is projecting inward from the piston body 74, and a tapered projecting end of the projecting rod 74' is engaged with the engaging fixing body 66. A sliding rod 74 ″ is formed so as to engage with the stopper taper hole 68 and extends outward from the base end of the piston body 74. Outside the outer end of the sliding hole of the engagement cylinder 72. A female screw portion is formed by providing a stepped portion having a large diameter toward the inside, and a threaded sealing cylinder 75 is screwed to this female thread portion, and the central portion of the threaded sealing cylinder 75 slides on the piston body 74. Provided so that the rod 74 "slides on the guide.

In the figure, reference numerals 76, 77 and 78 are O-rings, 79 is a piston packing, and 80 is a compression spring which constantly urges the piston body 74 outward.

A sensing piece 81 is provided at the end of the sliding rod 74 "of the piston body 74, and a guide hole is provided above the sensing piece 81.
The guide rod 82 is inserted into this guide hole, the base portion is screwed to the sealed cylinder 75, a bracket 83 is provided on the ram 4, and a detector 84 such as an optical sensor is erected on the bracket 83 for sensing. Piece
The upper part of 81 is bent laterally to form a sensing part 81 ', and when the piston body 74 moves toward the outside of the ram 4, the detector is detected.
84 is provided so as to detect the sensing unit 81 and emit a signal.

The spindle 2 is provided with a plurality of output signal transmission terminals corresponding to the positions of the cutting blades 62, and the machine body A is provided with a reception signal reception terminal for receiving the transmission signal of the output signal transmission terminals. It is provided so as to rotate the main shaft 2 until the transmission signal of the output signal transmission terminal of 1 corresponding to the cutting blade 62 of 1 coincides with the reception signal reception terminal, and the rotation of the main shaft 2 is stopped and the cutting of 1 is performed. When the cutting tool 62 reaches a predetermined position, the main shaft 2 is fixed to the ram 4 by the fixing mechanism 64 and the clamp means 5, the turning processing by the cutting tool 62 is completed and the ram 4 is lifted, and then the cutting processing in the next step. The output signal transmitting terminals 2 corresponding to the two cutting blades 62 for use are provided so as to be magnetized, and the main shaft 2 is rotated. In this way, according to the cutting process of the work W, the output signal transmitting terminals are successively re-magnetized to set the cutting tool 62 at a predetermined position, and the indexing control mechanism is provided.
Make up 63.

The indexing control mechanism 63 can be designed in various ways, such as performing indexing work by utilizing the principle of the encoder.

The structure of this embodiment having the above-mentioned structure has the following operational effects.

When the rotary tool a is mounted and a hole is to be drilled and tapped, the taper shank 1 of the rotary tool a is first inserted into the taper hole 2'of the main spindle 2 and the draw bar mechanism 52 is used to pull-pull the head of the rotary tool a. When the part is pulled upward, the key groove 55 of the rotary tool a is engaged with the end surface key 54 of the spindle 2, and the rotary tool a is firmly fitted into the tapered hole 2 ′ of the spindle 2. Then, the fixing mechanism 64 is released and the main shaft 2 is released from the ram 4.

When the fluid pressure is released from the fluid pressure pipe 18, the clamp means 5
Since the hydraulic pressure in the piston fitting hole 11 ₁ is reduced and the piston head 14 and the sliding piston 15 are not pressurized by the hydraulic pressure, the repulsive force of the anti-shrink elastic body 16 causes the upper and lower tapered ring bodies 8 and 8 '. The upper and lower taper engaging surfaces of the are separated from the taper bearing surface / opposing bearing surface 6, 7, 6 ', 7', and the coupling between the spindle 2 and the opposing cylindrical body 9 by the tapering ring body 8, 8'is eliminated,
The rotation torque of the electric motor 53 is transmitted to the key groove 55 of the rotary tool a by the end surface key 54 of the main shaft 2, and the main shaft 2 rotates while maintaining the correct position by the bearing 3.

When performing a turning operation, the rotary tool a is extracted from the main spindle 2, the taper shank 1 of the turning tool b is fitted into the taper hole 2'of the main spindle 2, and the pull bar mechanism 52 pulls the head of the turning tool b. When the portion is pulled, the end surface key 54 of the spindle 2 is fitted into the key groove 55 of the turning tool b, the relative position of the spindle 2 and the cutting tool 62 of the tool holding section 61 is determined, and the taper hole 2'of the spindle 2 is set as described above. The turning tool b is tightly fitted in.

When the piston fitting hole 11 ₁ is pressurized from the fluid pressure pipe 18, the piston head 14 rises and the lower taper ring body 8 ′ is pressed upward, and the sliding piston 15 descends to move the upper taper ring. Since the body 8 is pressed downward, the anti-shrink elastic body 16 is compressed and the taper surfaces of the upper and lower taper ring bodies 8 and 8'are tapered bearing surfaces / opposed taper bearing surfaces 6, 7, 6 '.
The main shaft 2 is fixed to the ram 4 because the main shaft 2 and the opposed cylindrical body 9 are integrally connected by pressurizing 7 '. At this time, taper bearing surface / opposing taper bearing surface 6, 7, 6 '・
7'and the taper ring 8 ', the engaging bearing surfaces are formed in a tapered shape, so that the axis of the spindle 2 automatically coincides with the axis of the ram 4, and the spindle housing 2 mounts the bearing 3 on the ram 4. The main component of the cutting force of the work W is transmitted to the main spindle 2 by the end surface key 54 of the main spindle 2 by the key groove 55 of the turning tool b, and the main spindle 2 is Since the bearing 3 is fixed to the ram 4 while fixing the bearing 3 in the correct position by the tapering members 8 and 8 ', the main component force of the cutting force is not directly transmitted to the bearing 3 via the spindle housing 2 unlike the conventional case. Heavy cutting is possible without deteriorating the accuracy of 3 or giving damage.

Next, the spindle 2 is moved by the indexing control mechanism 63.
Is rotated by a predetermined angle to rotate a single cutting blade 62 having a desired shape among the cutting blades 62 attached to the blade holding portion 61 to a predetermined position, and at that position, the base of the piston body 74 is screwed and hermetically sealed. Tube 75
When the engaging cylinder body 72 between them is pressurized, the piston body 74 overcomes the urging force of the compression spring 80 and moves to the main shaft 2 side, and the tip of the projecting rod 74 ′ has the locking taper hole of the locking fixing body 66. Fit in 68 and fix main shaft 2 to ram 4.

The clamping means 5 is operated to fix the spindle 2 in the radial direction, the ram 4 is lowered, and the work W is cut by the cutting tool 62 of 1 without directly applying a cutting force to the bearing 3. .

When the cutting work of the part of the work W with the cutting tool 62 of 1 is completed, the ram 4 is raised and the clamping means 5 is released, and then the engaging cylinder between the base of the piston body 74 and the screw-sealing cylinder 75. When the pressure in the body 72 is released, the piston body 74 moves toward the outside of the ram 4 by the urging force of the compression spring 80, so that the sensing unit 81 ′ moves, and this movement is detected by the detector 84. The lamp indicating the state of the rotation standby of the main shaft 2 is turned on.

[0034]

Since the present invention is configured as described above, when the rotary tool is mounted and drilling or tapping work is performed, the clamp means and the fixing mechanism are released to release the fixing of the ram and the spindle. Similarly, the main shaft can be rotatably mounted on the ram via bearings to perform a predetermined machining on the work.

When a turning tool is attached and a cutting operation is performed, the spindle is rotated by a predetermined angle by the indexing control mechanism and a plurality of different cutting blades attached to the periphery of the blade holder. A state in which a desired cutting tool is selected from the inside, this cutting tool is rotated to a predetermined position and the main shaft is fixed to the ram by the fixing mechanism, and then the main shaft is fixed in the radial direction by the clamping means to prevent damage to the bearing. Since turning can be performed with, the cutting blades can be turned one after another according to each cutting process of the workpiece and the workpiece can be turned with this cutting blade, improving work efficiency and degrading bearing accuracy. It is a practical and excellent tool mounting device for a turning center that will not cause damage or damage.

[Brief description of drawings]

FIG. 1 is an explanatory front view showing a schematic configuration of a turning center of this embodiment.

FIG. 2 is a front view in which a part of a tool attachment device equipped with a turning tool of the present embodiment is cut away.

FIG. 3 is a bottom view of the above.

FIG. 4 is a front sectional view of a main part of a tool mounting device in which a rotary tool of the present embodiment is mounted.

FIG. 5 is an enlarged front cross-sectional view of the main part when the clamp means of this embodiment is released.

FIG. 6 is an enlarged front sectional view of a main part when the clamp means of the present embodiment is fixed.

[Explanation of symbols]

 a rotary tool b turning tool 1 taper shank 2 main spindle 3 bearing 4 ram 5 clamping means 61 blade holder 62 cutting blade 63 indexing control mechanism 64 fixing mechanism

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Makoto Hasegawa 2-1-1 Kitazonocho, Nagaoka City, Niigata Om Manufacturing Nagaoka Factory (72) Inventor Nisio Suzuki 2-1-1 Kitazonocho, Nagaoka City, Niigata Prefecture No. OM Co., Ltd. Manager Oka Factory

Claims (1)

[Claims] 1. A spindle for holding a tapered shank of a tool is rotatably provided with a bearing between the spindle and a ram. When a rotary tool is used, the spindle is released to make the spindle rotatable.
When using a turning tool, a clamp means for fixing the spindle in the radial direction is provided so as to be able to be released and fixed, and a plurality of different cutting blades are projected at predetermined intervals around the blade holding portion of this turning tool. When a turning tool is used, an indexing control mechanism for controlling the rotation of the main spindle by a predetermined angle and a fixing mechanism for fixing the main spindle to the ram at the indexing position are provided on the machine body. .