JPH035936B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a multi-processing device that processes multiple locations, such as a valve seat and a system guide hole in a cylinder head of an internal combustion engine, in one process.

(Prior art) In a conventional multi-tasking device of this type, a first tool is mounted coaxially with the main shaft of a machine tool, and a second tool having a smaller diameter than the first tool is mounted coaxially with the main shaft and the first tool. The second tool is provided so as to be able to move axially through the first tool.
Some machines are equipped with an axial movement means for moving the tool in the axial direction, but these are all specialized machines, and the first
The tool and the second tool were directly attached to the spindle, making it difficult to replace the tool. Therefore, like the cylinder head valve seat and stem guide hole mentioned above,
In the case of workpieces with complex machining parts that required machining to different dimensions on the intake and exhaust sides, the machining was divided into two processes using two specialized machines. Furthermore, in the case of workpieces that require complex machining of different dimensions depending on the model, it is necessary to process them with different dedicated machines, and an increase in the number of dedicated machines and processing time is unavoidable. For this purpose, it is conceivable to use a machine tool equipped with a tool changer, but conventionally there is no machine tool of this type that can be used for multi-tasking. It is not suitable for complex machining that requires precision in coaxiality. Furthermore, an increase in machining time due to an increase in the number of tool changes was unavoidable.

(Objective of the Invention) In order to solve the above-mentioned problems, the present invention aims to provide a multi-tasking device in which a multi-tasking tool can be replaced as one unit.

(Structure of the Invention) In order to achieve the above-mentioned object, the present invention provides a composite processing device of this type, which has a fitting part at one end that is detachably attached to the main shaft, and has a through hole coaxial with the main shaft. A tool holder, a tool shank fitted in the through hole of the tool holder so as to be able to pivot, a first tool attached to the other end of the tool holder, and a first tool attached to the tip of the tool shank to connect the first tool to the main shaft. A compound machining tool is constituted by a second tool coaxially and movably penetrating the compound machining tool, and the compound machining tool is located near a mounting portion of the compound machining tool within the spindle and is mounted on the spindle by actuation by a first actuating device. a first locking means for fixing the tool holder of the compound machining tool to the main shaft;
an actuating member provided in the spindle so as to be able to move axially therein; and an actuating member provided at the tip of the actuating member and actuated by a second actuating device to move the rear end of the tool shank of the compound machining tool mounted on the main spindle to the and a second locking means for locking at least relative axial movement on the actuating member, and the axially moving means causes the second tool to be axially moved relative to the first tool via the actuating member. It is characterized by this.

(Effects of the Invention) The present invention described above allows a compound machining tool that is equipped with a first tool and a second tool that move relatively in the axial direction and perform machining separately to be replaced as one unit, so that it is possible to replace the compound machining tool as one unit. A workpiece with multiple machining locations can be machined with one device, increasing the operating efficiency of the equipment and shortening the machining time. Furthermore, it is possible to maintain the coaxiality accuracy of the centers of two machining parts that are simultaneously machined.

(Example) First, the main part of the present invention will be explained with reference to the example shown in FIGS. 1 to 4. The main shaft 11 is supported by a main shaft head 100 of a machine tool, and is rotationally driven by a motor (not shown) via a gear 12a. The compound machining tool 30 includes a tool holder 31 that is detachably attached to the main spindle 11, and a tool shank 33 that is fitted into a through hole 31b of the tool holder 31 so as to be able to pivot.
and the first tool 3 attached to the tip of the tool holder 31.
5, and a second tool attached to the tip of the tool shank 33 and passing through the first tool 35 coaxially with the main shaft and movable axially.
A compound machining tool 30 constituted by the tool 36 is attached to the main shaft 11 via the fitting portion 31a of the tool holder 31, and is fixed to the main shaft 11 by the first locking means 40 operated by the first actuating device 50. Main shaft 1
1, an actuating member 60 is disposed to be able to move axially, and a second locking means 65 at the tip thereof is actuated by a second actuating device 70 to lock the rear end of the tool shank 33 into the actuating member 6.
Lock at 0. The second tool 36 is moved together with the tool shank 33 via the actuating member 60 to the shaft moving means 8.
0, the axis is moved relative to the first tool 35.

The illustrated embodiment performs combined machining of the valve seat of the cylinder head and the system guide hole. First, the first tool 35 is pressed against the valve seat surface of the cylinder head while the second tool 36 is retracted. Then, after slightly returning the first tool 35, the second tool 36 is moved forward by the shaft moving means 80 to machine the stem guide hole.

This example will be described in detail below.

The spindle head 10 shown in FIGS. 1 and 2 is
As is well known in machine tools, it is mounted on a column or the like, and is movable back and forth, left and right, and up and down relative to the bed as necessary. A cylindrical body 12 having a gear 12a for rotational driving is fixed to the main shaft 11 via a key 13 and a ring nut 14, and these are supported by bearings 16, 17, 18 provided in a front housing 10a integrated with the main shaft head 10. It is supported by a bearing 19 at the rear of the main shaft head 10, and is rotationally driven by a motor via a gear 12a. The tip of the main shaft 11 (the left end in FIG. 1) has a tapered hole 15a into which a tool holder 31 of a compound machining tool 30, which will be described later, is mounted.
Fix the adapter 15 with the

The compound machining tool 30 includes a tool holder 31, a tool shank 33, a first tool 35, and a second tool 36. The tool holder 31 has the aforementioned adapter 15 at the rear.
It has a tapered fitting part 31a that is attached to the main shaft 11 through a tapered hole 15a, and a through hole 31b is provided coaxially with the rotation center axis of the main shaft 11. A part of the through hole 31b is formed by a sleeve 31c fixed inside the tool holder 31.
A keyway 31d is provided on the inner surface. Tool holder 3
A compound machining tool 30 is mounted on the main shaft 11 at the center of the outer periphery of the
A flange 31e is provided to be used when attaching and detaching. A press stud 3 is attached to the rear end of the tool holder 31.
2 are screwed together and fixed, and a through hole 3 is coaxial with the through hole 31b.
2b is provided. A radial engagement protrusion 32a is provided at the tip of the pull stud 32, which cooperates with a first locking means 40 to be described later to lock the engagement portion 31 of the tool holder 31.
a is pressed and fixed into the tapered hole 15a. A tool shank 33 is fitted into the through hole 31b of the tool holder 31, and the tool shank 33 can freely move axially relative to the tool holder 31 by means of a key 34 that slides in the keyway 31d, but rotation is restricted. I'll do what I do. An engagement protrusion 33a is integrally provided at the rear end of the tool shank 33 via a narrow diameter portion 33b. The engaging protrusion 33a and the narrow diameter portion 22b protrude from the rear end of the pull stud 32 when the tool shank 33 is in its most advanced state (the state shown in FIG. 1), and the engaging protrusion 33a is connected to the narrow diameter portion 33b.
The tool shank 3 is chamfered with a width approximately equal to the diameter of the tool shank 3.
3 is engaged with the tip of an actuating member 60, which will be described later. A cutting blade 35 is provided at the tip of the tool holder 31 for predetermined processing (in this embodiment, cutting of a valve seat).
Fix the first tool 35 having a. 1st tool 3
5 is provided with a through hole 35b that is coaxial with the main shaft 11, and a second tool (in this embodiment, a gun reamer for machining the stem guide hole) 36 attached to the tip of the tool holder 31 via a chuck 37 is axially moved. When the second tool 36 is inserted freely and the tool shank 33 is in its most advanced state, the tip of the second tool 36 protrudes beyond the first tool 35, as shown in FIG. The through hole 35b is formed by a bush 35c fixed to the first tool 35. The tool holder 31 is attached to the main shaft 11 at a predetermined angular position, and for this purpose, a well-known angular positioning means (not shown) is provided between the tool holder 31 and the adapter 15.

The tool holder 31 of the compound machining tool 30 is attached to the main shaft 11
a first locking means 40 and a first actuating device 50 for fixing the
is as follows. The first locking means 40 consists of a sleeve 41, a holder 42, and a ball 43, and the second
As shown in the figure, it is provided in the main shaft 11 on the right side near the attachment part of the compound machining tool 30. The sleeve 41 is screwed and fixed to the inner surface of the main shaft 11, and a cylindrical holder 42 is fitted and held on the inner surface thereof so as to be able to pivot. A plurality of holding holes 42a are bored along the circumference of the tip of the holder 42, and hold steel balls 43 having a diameter slightly larger than the wall thickness of the holder 42. If the holder 42 moves to the left in FIG. It is possible to spread it out and pass through it. As a result, the first locking means 40 is released, and the tool holder 31 can be attached or detached. When the holder 42 is moved to the right with the tool holder 31 attached, the balls 43 are pushed by the inner surface of the fitting portion of the sleeve 41, project to the inner surface of the holder 42, and engage with the engagement protrusion 32a of the pre-stad 32. A tubular drawbar 49 provided coaxially within the main shaft 11 is screwed and fixed to the rear end of the holder 42 . Although the drawbar 49 is capable of axial movement relative to the main shaft 11, its rotation is restricted by the engagement pin 11a and the engagement groove 49b. The first actuating device 50 includes an elastic device 51 that presses the holder 42 to the right via the draw bar 49 to actuate the first locking means 40, and moves the draw bar 49 to the left against the elastic device 51. It consists of a first cylinder device 55 for releasing the first locking means 40.
The elastic device 51 consists of a first flange 52 screwed and fixed to the rear end of the drawbar 49, a second flange 53 installed at the rear end of the main shaft 11, and a compression spring (disc spring) 54 provided between both flanges 52, 53. . The compression spring 54 presses the holder 42 to the right via the draw bar 49, and the engagement protrusion 32 of the pull stud 32
tool holder 31 via ball 43 that engages a.
The fitting part 31a of the adapter 15 is inserted into the tapered hole 15a of the adapter 15.
Press and fix. The elastic device 51 is connected to the main shaft bed 10.
The rear housing 10b is located within the rear housing 10b. The first cylinder device 55 consists of a cylinder 56, a piston 57, a closing plate 58, and a pusher 59,
It is provided at the rear end of the rear housing 10b. When hydraulic pressure is applied between the rear surface of the piston 57 of the first cylinder device 55 and the front surface of the closing plate 58, the piston 57 moves to the left, pushes the first flange 52 to the left via the pusher 59, and the compression spring 54 The draw bar 49 and the holder 42 are moved to the left against this movement, and the first locking means 40 is released. First flange 52 of first actuating device 50
The piston 57 and the pusher 59 are provided with a through hole through which an operating member 60 (described later) is inserted.

An actuating member 60 is provided on the main shaft 11 inside the tubular drawbar 49 so as to be freely axially and rotatably movable. The first locking means 65 consists of an engagement groove 66 with a T-shaped cross section along the radial direction and having a pair of inward protrusions 66a at the tip,
It is provided integrally at the tip of the actuating member 60. The second actuating device 70 includes a pinion 71 and a rack 72 fixed to the rear end of the actuating member 60, a second cylinder device 73, and a support member 74 that supports the second cylinder device 73 on a fixed base 10c integrated with the spindle head 10. It consists of If the second cylinder device 73 operates, it will be easy 7.
2 reciprocates, and the actuating member 60 rotates within a range of 90 degrees via the pinion 71 that meshes with it.
The locking means 65 is given both engaged and released states.
In the released state of the second locking means 65 shown in FIG. 3b, the direction of the engagement groove 66 is
and the direction of the engagement protrusion 33a at the rear end of the tool shank 33 determined by the angle positioning means (not shown) between the tool holder 31 and the key engagement means 31d and 34 between the tool holder 31 and the tool shank 33. Accordingly, the compound machining tool 30 can be attached to and detached from the main spindle 11. From this state, the second cylinder device 7
3 is actuated to rotate the actuating member 60 90 degrees to the right into the engaged state shown in FIG. 3a.

In the engaged state of the second locking means 65, the shaft movement means 8
can pivot the second tool 36 together with the tool shank 33 via the actuating member 60 . The shaft moving means 80 includes a guide rail 81 provided parallel to the main shaft 11 on a fixed base 10c integrated with the main shaft head 10, a movable base 82 that moves on the guide rail 81, and a connection installed on the movable base 82. means 83, a drive nut 86 fixed to the movable table 82, a screw shaft 85 screwed onto the drive nut 86, and a screw shaft 85 which is rotated to rotate the movable table 8.
It consists of a drive motor 84 that drives 2. The coupling device 83 is rotatably but non-axially coupled to the rear end of the actuating member 60, so that when the drive motor is activated, the actuating member 60, tool shank 33, and second tool 36 move in the axial direction. .

The above-described rotation of the actuating member 60 for engaging and disengaging the second locking means and the axial movement of the actuating member 60 for moving the second tool 36 and the tool shank 33 operate in relation to each other. . That is, the actuating member 60 is provided with an axial engagement groove 61 and a circumferential groove 62 at its rear end, and the drawbar 49 is provided with an engaging pin 49b that engages with the grooves 61 and 62, so that the actuating member 60 is rotatable relative to the main shaft 11 only in the most advanced state; in this state, the pinion 71 at the rear end of the actuating member 60 meshes with the rack 72 to rotate the actuating member 60. Further, the actuating member 60 can be retracted by the shaft moving means 80 only when the second locking means 65 at the tip is engaged. When the actuating member 6 moves backward, the pinion 71 also moves along the two-dot chain line 7.
It moves backward as shown at 1' and is disengaged from the rack 72.

The operation of this embodiment is as follows.

With the main shaft 11 stopped at a predetermined angular position, the actuating member 60 advanced the most, and the first locking means 40 and the second locking means 65 released, a known tool changer is used to change the tool of the compound machining tool 30. Holder 3
1 gripping flange 31e, and the fitting part 31
a to the tapered hole 15 of the adapter 15 at the tip of the main shaft 11
Attach it to a. Next, the piston 57 of the first cylinder device 55 of the first actuating device 50 retreats, and the first locking means 40 is actuated by the elastic means 51 to fix the tool holder 31 to the adapter 15 at the tip of the main shaft 11, and the second actuating device The cylinder device 73 of the device 70 is connected to the second locking means 6 via a rack 72 and a piston 57.
5 to engage the tool shank 33 with the tip of the operating member 60. Next, the shaft moving means 80 is moved backward, and the second tool 36 and the tool shank 33 are brought to the most retreated position relative to the first tool 35 via the actuating member 60. The main shaft 11 is rotationally driven through the gear 12a, and the main shaft head 10 is advanced to move the first
Machining is performed by pressing the tool 35 against the valve seat surface of the cylinder head. After finishing processing the valve seat surface,
The first tool 35 is slightly returned together with the spindle head 10, the axial movement of the spindle head 10 is stopped, and then the rotational speed of the spindle 11 is changed as necessary, and the second tool 35 is
is rotated by the main shaft 11 via the key 34 and moved forward by the shaft moving means 80 to machine the stem guide hole. When the above-mentioned machining with a predetermined compound machining tool (for example, a compound machining tool on the intake valve side) is completed, the compound machining tool is removed from the main spindle 11 and used for the next machining with a compound machining tool (for example, a compound machining tool on the exhaust valve side). (machining tool) and perform the next machining.

In this embodiment, a ball lock type is used as the first locking means 40, and a T-groove is used as the second locking means 65, but other types such as a collect chuck or the like may also be used. It is possible, and the first actuating device 50 and the second actuating device 70 may be selected accordingly.
Moreover, although the compound machining tool 30 is attached to and detached from the main spindle 11 with the second tool 36 in the most advanced state, it may be attached and detached with the second tool 36 in a retreated state. In addition, the machining feed of the second tool 36 is
Although the feeding of the second tool 36 is stopped and the axial movement means 80 is used, the axial movement means 80 may be switched only between two positions, front and rear, by a cylinder device or the like, and the second tool 36 may be processed and fed by the main shaft 11.

(Effects of Embodiment) The present embodiment described above includes a compound machining tool 30 that is detachable from the main spindle 11, and the first tool 35 and the second tool 36 have separate first locking means 40 and second locking means 40, respectively.
Since the locking means 65 locks the main shaft side and controls the relative axis movement, the workpiece can be machined under machining conditions suitable for each of the first and second tools, and the entire compound machining tool 30 can be machined at once. Can be exchanged. Therefore, the number of tool changes can be reduced and machining time can be shortened, and even workpieces with multiple tool locations (intake side and exhaust side) with different specifications, such as cylinder head valve seat and stem guide hole machining, can be machined in one place.
It can be processed in one step using one machine. In addition, if this device is used in combination with a workpiece discrimination device,
Even if products such as cylinder heads of different models and therefore different processing specifications are fed into one device in random order, they can be processed accordingly. Therefore, processing time can be shortened, operating efficiency can be increased, and production plans can be flexibly responded to. In addition,
Needless to say, the coaxiality of the centers of the parts simultaneously machined by the compound machining tool 30 of this embodiment is maintained at a higher precision than when the parts are machined in two parts by a single machining tool. .

[Brief explanation of the drawing]

1 to 4 show an embodiment of the present invention, and FIGS. 1 and 2 are longitudinal cross-sectional views of the front and rear parts, respectively;
FIGS. 3a and 3b are cross-sectional views taken from FIG. 1 showing the operating state, and FIG. 4 is a cross-sectional view taken from FIG. 2. Explanation of symbols, 11...Spindle, 3...Compound machining tool, 31...Tool holder, 31a...Fitting part, 3
1b...Through hole, 33...Tool shank, 35...
...first tool, 36...second tool, 40...first locking means, 50...first actuating device, 60...actuating member, 65...second locking means, 70...second actuation Device, 80... Axial movement means.

Claims (1)

[Claims] 1 Attach the first tool coaxially with the main shaft of the machine tool,
A second tool having a smaller diameter than the first tool is disposed coaxially with the main shaft and can be axially movable through the first tool, and an axial movement means for moving the second tool in the axial direction with respect to the first tool. A tool holder having a fitting part at one end that is removably attached to the main spindle and having a through hole coaxial with the main spindle, and a tool holder that is fitted into the through hole of the tool holder so as to be able to move axially. A compound machining tool is formed by a combined tool shank, a first tool attached to the other end of the tool holder, and a second tool attached to the tip of the tool shank and penetrating the first tool coaxially and movably with the main shaft. a first engaging member configured to be configured and located near a mounting portion of the compound machining tool in the spindle and actuated by a first actuating device to fix the tool holder of the compound machining tool mounted on the spindle to the spindle; a stop means, an actuating member disposed in the main shaft so as to be able to move axially therein, and the tool shank of the compound machining tool mounted on the main spindle provided at the tip of the actuating member and actuated by a second actuating device. a second locking means for locking a rear end of the second tool to the operating member so as to be at least relatively axially movable; A multi-processing device that is characterized by being designed to