JPH0429489B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a cutting device that processes a workpiece, and more particularly, to a cutting device that simultaneously cuts the inner diameter portions of both ends of the workpiece. It is something.

[Prior Art] Conventionally, as a method of holding one end of the workpiece in a chuck and cutting the inner diameter portions WL and WR of both ends of the workpiece W as shown in FIG.
After cutting the inner diameter portion WR on the other end side of the workpiece W with a cutting tool using one automatic lathe, the workpiece W is temporarily removed from the chuck, the workpiece W is turned over, and the other end of the workpiece W is cut. It is known to hold the end side in a chuck and cut the inner diameter portion WL of one end side of the workpiece W with a cutting tool.

Another cutting method is to use two headstocks installed opposite to each other, and first grip one end of the workpiece W via a chuck on the main shaft of one of the headstocks. Cut the inner diameter part WR on the end side using a cutting tool. Next, the other end of the workpiece W is gripped by a chuck on the spindle of the other headstock, and the inner diameter portion WL of one end of the workpiece W is cut with a cutting tool to cut the other end of the workpiece W. The inner diameter of the side is machined.

[Problems to be Solved by the Invention] However, in both the former and latter methods of the prior art described above, after one end of the workpiece W is held in a chuck and cutting is performed, the other end of the workpiece W is cut. The end side is gripped with a chuck again. Therefore, it is very difficult to accurately grasp the position of the axis of each inner diameter part on both ends of the workpiece W to be cut so as not to cause misalignment. In other words, in order to grip both ends of the workpiece W with chucks and to prevent misalignment of the axis, the outer diameters of both ends of the workpiece W must be the same; The outer diameters of both ends are not necessarily the same diameter. In order to make the outer diameters on both ends the same diameter, the outer diameter must be machined before cutting the inner diameter portions on both ends, which requires a lot of effort. Therefore,
This poses a problem in that the axes on both ends of the workpiece W are misaligned.

In addition, since the inner diameter portions of one end and the other end of the workpiece W are cut separately, cutting time is required, and due to the problem of misalignment mentioned above, the inner diameter portion cannot be cut accurately. It is not possible.

SUMMARY OF THE INVENTION An object of the present invention was proposed in order to solve the problem in view of the above-mentioned circumstances. To provide a cutting device which can perform accurate cutting without causing misalignment, and can shorten the cutting time.

[Means for Solving the Problem] In order to achieve the above object, the present invention provides a plurality of spindles for cutting the workpiece, which are installed in front of a headstock rotatably supporting a chuck that can freely grip the workpiece. A cutting device is provided with a reciprocating carriage equipped with a cutting tool so as to be reciprocally movable in a Z-axis direction parallel to the axial direction of the headstock and in an X-axis direction orthogonal to the Z-axis direction; A support member having a rotation shaft rotatable around an axis parallel to the Z-axis is attached to the attached tool support base, and a motor for rotating the rotation axis is attached and provided, and the workpiece is A tool holder having a plurality of tools protruding in the same direction orthogonal to the Z-axis for simultaneously machining multiple holes formed in the piece is attached to the rotating shaft, A lock plate having an inclined portion that can be freely engaged and detached from an index pin provided at an eccentric position relative to the rotary shaft is provided so as to be able to reciprocate in a direction perpendicular to the axis of the rotating shaft, and when the motor is stopped, The tilted portion of the lock plate is configured to engage the index pin so that the protruding direction of the plurality of tools is always constant.

[Example] Hereinafter, an example of the present invention will be described in detail based on the drawings.

Referring to FIG. 1, a headstock 3 of an automatic lathe 1 is mounted on a bed (not shown), and a main shaft is rotatably mounted within the headstock 3. A chuck 5 is provided at the tip of the main shaft, and one end side of the workpiece W is gripped by the chuck 5.

At a position in front of the headstock 3 to the right in FIG. It is arranged so that it can be moved freely. This carriage 7 is mounted so as to be movable in the X-axis direction on a slider (not shown) which is slidable in the Z-axis direction, and the Z-axis movement of the slider and the X-axis movement of the carriage 7 are not shown in the figure. This is carried out by an appropriate drive device such as an omitted ball screw mechanism. A plurality of cutting tools 9 are suitably mounted on the carriage 7 and are capable of machining one end side of the workpiece W gripped by the chuck 5 provided on the main shaft and the other end side thereof. A machining head device 11 equipped with a plurality of comb blade tools, for example two, for machining the inner diameter portions of both ends of the workpiece W shown in FIG. 3 is mounted. moreover,
The reciprocating table 7 is provided with a gripping member that grips the other end of the workpiece W when cutting off the product from the other end of the workpiece W using a cut-off bit provided in a tool holder (not shown). A workpiece gripping device 13 is fitted.

Therefore, one end side of the workpiece W is gripped and fixed via the chuck 5 to the main shaft rotatably supported by the headstock 3, and the main shaft is rotated, and a plurality of appropriate cutting machines mounted on the carriage 7 are rotated. After aligning the tool 9 with the workpiece W, by appropriately controlling the movement of the carriage 7 in the Z-axis and X-axis directions,
The other end side of the workpiece W will be processed appropriately by the cutting tool 9.

Bearing holes such as bearings centered on the shaft center CL are located on the left side in FIG. 3 on one end of the workpiece W shown in FIG. 3 and on the right side in FIG. 3 on the other end.
When machining WL and WR at the same time, first
Pre-drill a through hole WC with a smaller diameter than WL and WR.
To drill this through hole WC in advance, grip the chuck 5 provided on the main spindle 3 of the automatic lathe 1 shown in FIG. 1 at one end of the workpiece W shown in FIG. Rotate. Shuttle 7
Through-holes from a plurality of appropriate cutting tools 9 attached to the
A cutting tool for machining the WC is selected, and the movement of the carriage 7 is appropriately controlled in the Z-axis and X-axis directions in correspondence with the workpiece W to drill the through-hole WC. Next, one end of the workpiece W is held as it is in the chuck 5 and the main shaft is not rotated, and the tool of the machining head device 11 equipped with two comb blade tools mounted on the carriage 7 Holder 15
A tool holder fixing device, which will be described later, performs position indexing while keeping the directionality of the two comb blade tools constant. Next, the carriage 7 is moved in the Z-axis and X-axis directions to move the tool holder 15 into the through hole WC.
Insert it inside. The above position indexing of the comb blade tool is to prevent the comb blade tool from interfering with the through hole WC when it is inserted into the through hole WC. After inserting the tool holder 15 into the through hole WC, the tool holder 15 is rotated to a constant rotation by the tool holder rotation drive motor 17, and the carriage 7 is controlled to move in the Z-axis direction. , both ends of the workpiece W shown in FIG.
For example, bearing holes for mounting bearings on WL and WR can be machined simultaneously and accurately in a short time without misalignment.

Next, the structure of the tool holder fixing device incorporated in the machining head device 11 mounted on the carriage 7 will be explained in detail with reference to FIG.

In FIG. 2, a tool support stand 1 is placed on the carriage 7.
9 is placed thereon, and the drive motor 17 for rotating the tool holder is provided at the rear left side of the tool support stand 19. Further, on the left front side of the tool support stand 19, a support member 2 rotatably supports the tool holder 15.
1 is provided, and the tool holder 1 is attached to the support member 21.
5 is supported. Two comb blade tools T1 and T2, which are a plurality of cutting tools, are fixed to the tool holder 15 by a set screw or the like, spaced apart from each other at a constant interval in the axial direction of the tool holder 15 and protruding in the same direction.
It is to be noted that it would be even better if the two comb blade tools T1 and T2 were configured to be movable and adjusted in the axial direction of the tool holder 15, respectively. A long groove 23 whose both ends are circular is bored on the right side of the tool support 19. A drive pulley 25 is attached to the long groove 23 on the output shaft of the drive motor 17 for rotating the tool holder, and a rotation shaft for rotating the tool holder 15 is provided in the support member 21, and the rotation thereof is The shaft is attached to a driven pulley 27.

A belt 29, such as a timing belt, is wound around the drive pulley 25 and driven pulley 27.

Therefore, the tool holder rotation drive motor 17
When driven, the drive pulley 25, belt 29,
The rotation is transmitted to the tool holder 15 via the driven pulley 27 and the rotating shaft, and the two comb blade tools T1 and T2 attached to the tool holder 15 are rotated at a constant rotation.

A tool holder fixing device 31 is provided at the rear right side of the tool support 19 in FIG. . More specifically, as shown in FIG. 2, an air cylinder 33 of a tool holder fixing device 31 is attached to the right rear side wall of the tool support stand 19. A piston rod 35 extends in front of the air cylinder 33 and is mounted so as to be movable in the X-axis direction. piston rod 35
A lock plate 37 is integrally attached to the tip. The lock plate 37 has a sloped portion 3 whose upper part slopes upward to the right from the tip side toward the rear side.
7K is formed.

On the other hand, an index pin 39 is integrally attached to one end of the driven pulley 27 closer to the outer circumference. Furthermore, a groove 41 is bored in a part of the outer periphery of the driven pulley 27, and the tool support stand 1 faces the groove 41.
A proximity switch 43 is provided within the switch 9 . In addition,
When the driven pulley 27 rotates slightly to determine the position, the proximity switch 43 detects the presence or absence of the groove 41 to check whether or not the position has been determined.

With the above configuration, when the air cylinder 33 is operated and the piston rod 35 moves forward to the left in FIG. 2, the lock plate 37 integrally attached to the tip of the piston rod 35 moves forward. When the lock plate 37 moves forward, the inclined portion 37 of the lock plate 37
K comes into contact with the index pin 39, and the pin 39 rotates slightly, so that the tool holder 15 is always held in a fixed direction in the state shown by the solid line in FIG. In this state, by moving the carriage 7 in the X-axis direction, the tool holder 15 is moved slightly from the axis of the workpiece W to the state shown by the solid line, so that the tool holder 15 is aligned with the through hole WC. It will be inserted without interference. In addition, two comb blade tools T1 and T2 which are cutting tools attached to the tool holder 15
By operating the tool holder fixing device 31, the comb blade tools T1,
Since the directionality of T2 is maintained constant, the comb blade tools T1 and T2 will not interfere with the through hole WC.

By providing the tool holder fixing device 31, the tool holder 15 equipped with the comb blade tools T1 and T2 can be easily and simply inserted into the through hole WC of the workpiece W. For example, bearing holes can be machined simultaneously on both ends of WL and WR accurately without causing misalignment.

Note that whether or not the positions of the comb blade tools T1 and T2 have been accurately determined is determined by detecting the groove 41 with the proximity switch 43.
Inner diameter portions at both ends of workpiece W in this example
Although WR and WL have the same diameter as shown in Fig. 3, they may have different diameters. In the case of different diameters, this can be handled by using two different comb blade tools.

[Effects] As can be understood from the above description of the embodiments, in short, the present invention provides a mechanism for cutting the workpiece W in front of the headstock 3 rotatably supporting the chuck 5 that can grip the workpiece W. A cutting process in which a reciprocating table 7 equipped with a plurality of cutting tools 9 for processing is provided so as to be able to reciprocate in the Z-axis direction parallel to the axial direction of the headstock 3 and in the X-axis direction orthogonal to the Z-axis direction. In the apparatus, a support member 21 having a rotating shaft rotatable around an axis parallel to the Z-axis is attached to a tool supporting stand 19 attached to the reciprocating table 7, and the rotating shaft is rotated. Motor 1 for
7, and includes a plurality of tools T1 and T2 protruding in the same direction orthogonal to the Z-axis for simultaneously machining a plurality of holes WC formed in the workpiece W. A lock plate 37 is attached to the rotating shaft and has a sloped portion 37K that can be freely engaged with and detached from an index pin 39 provided at a position eccentric to the axial center of the rotating shaft. A sloped portion 37K of the lock plate 37 is provided on the index pin 39 so that the tool T1, T2 can be reciprocated in a direction orthogonal to The structure is such that it engages.

As is clear from the above configuration, in the present invention, the tool support 19 mounted on the carriage 7 is equipped with a support member 21 having a rotating shaft and a motor 17. Multiple tools T that simultaneously process multiple locations of hole WC in W
1. Tool holder 1 with T2 protruding in the same direction
5 is attached to the rotating shaft.

Then, when the motor 17 is stopped, the indexing pin 39, which is provided at a position eccentric to the axis of the rotating shaft, is locked so that the protruding directions of the tools T1 and T2 are always in the same direction. A sloped portion 37K provided on the plate 37 is provided so as to be freely engageable and detachable.

Therefore, according to the present invention, when the motor 17 is stopped, the tools T1 and T2 provided in the tool holder 15 are
The direction of the protrusion is mechanically kept constant at all times. Therefore, when the tool holder 15 is automatically moved in and out of the hole WC of the workpiece W, the tool holder 15 is moved into the tool T relative to the axis of the hole WC.
1. It is easy to take the tool in and out eccentrically to the opposite side of the protruding direction of the tool T2, and the tool T1,
T2 does not interfere with the hole WC of the workpiece W.

Furthermore, since a plurality of holes WC in the workpiece W can be machined simultaneously using a plurality of tools T1 and T2, there is no possibility of misalignment of the axes of the plurality of locations.

[Brief explanation of drawings]

FIG. 1 is a schematic plan view of an automatic lathe to which the present invention is applied. FIG. 2 is an enlarged perspective view taken in the direction of the arrow in FIG. FIG. 3 shows a cross-sectional view of the workpiece to be machined, and is also an explanatory view showing the position indexing state of the tool. Explanation of the symbols representing the main parts of the drawings: 1... automatic lathe, 5... chuck, 7... carriage, 11...
...Machining head device, 15...Tool holder, 19...
...Tool support stand, 31...Tool holder fixing device, 3
7... Lock plate, 39... Index pin, W
...Workpiece, WC...Through hole, WL, WR
...Inner diameter part.

Claims (1)

[Claims] 1. A carriage 7 equipped with a plurality of cutting tools 9 for cutting the workpiece W is installed in front of the headstock 3 rotatably supporting a chuck 5 capable of gripping the workpiece W. A cutting device provided so as to be able to reciprocate in a Z-axis direction parallel to the axial direction and an X-axis direction perpendicular to the Z-axis direction,
A support member 21 having a rotary shaft rotatable around an axis parallel to the Z-axis is attached to a tool support stand 19 mounted on the reciprocating table 7, and a motor 17 for rotating the rotary shaft. installed and installed,
A tool holder 15 having a plurality of tools T1 and T2 protruding in the same direction orthogonal to the Z-axis for simultaneously machining a plurality of holes WC provided in the workpiece W is attached to the rotating shaft. , the lock plate 37, which is provided with an inclined portion 37K that can be freely engaged with and disengaged from the index pin 39 provided eccentrically with respect to the axis of the rotating shaft, is moved in a direction perpendicular to the axis of the rotating shaft. The index pin 3 is provided so as to be reciprocally movable so that the protruding direction of the plurality of tools T1 and T2 is always constant when the motor 17 is stopped.
9. A cutting device characterized in that the cutting device is configured such that the inclined portion 37K of the lock plate 37 is engaged with the lock plate 37.