JPH0446684B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a boring device equipped with a chamfering tool that performs boring and chamfering simultaneously.

<Prior Art> In boring the bore of a cylinder block, it is necessary to obtain concentricity between the position of the chamfer at the mouth of the bore and the position of the hole in the bore, so that the chamfering of the mouth and the drilling are performed simultaneously. For this purpose, use a boring tool with a boring tool and a chamfering tool installed apart from each other by the depth of the boring, move this boring tool forward toward the cylinder block while rotating, and just before reaching the forward end, the tool will be The mouth is chamfered at the same time as boring, and then the boring tool is retreated by letting the boring tool radially inward.

<Problems to be Solved by the Invention> The above example poses no problem if one type of cylinder block flows into the machine, but if the cylinder blocks have different heights and there is an end portion A of the bore. In particular, when boring and chamfering a multi-cylinder engine block, changing the forward end position of the boring spindle in order to chamfer the mouths of cylinder blocks of different heights with the same chamfering tool is important because the quill tip or The boring tool cannot be used because it interferes with the protrusion A.For this reason, conventionally, a machine with boring tools with different distances between the boring tool and the chamfering tool had to be installed separately, which required less machine space. There was a problem with the increase in cost as the size increased.

<Means for Solving the Problems> The present invention has been made to solve the above-mentioned problems, and includes a boring tool provided at the front of the quill, and a chamfering tool for chamfering at the rear of the quill. It is provided so that it can move forward and backward into two positions, a first machining position and a second machining position retreated from the first machining position, in conjunction with the forward and backward movement of the operating shaft.

<Function> With the above-described configuration, for a workpiece with a shallow boring depth, the second operating shaft is operated to position the chamfering tool at the first processing position, and the boring tool is used to perform boring processing. At the same time, chamfering is performed using a chamfering tool. When a workpiece with a deep boring depth comes to the workpiece, the chamfering tool is moved back to the second processing position, and while the boring tool is used to perform boring, the chamfering tool is used to perform chamfering.

<Examples> Examples of the present invention will be described below based on the drawings. In FIG. 1, 10 is a shaft head, and a spindle 11 is rotatably supported on this shaft head 10. A quill 12 is attached to the tip of the spindle 11, and together with this quill 12, the spindle 1
1 is adapted to be rotationally driven by a motor 13.

A second operating shaft 14 is supported on the spindle 11 so as to be able to move forward and backward in the axial direction while being prevented from rotating, and a second cylinder device (drive device) 15 is connected to the rear end of the second operating shaft 14. . A flange 16 is formed at the tip of the second operating shaft 14, and a recess 18 of the holder 17 is engaged with the flange 16. This holder 17 is attached to the spindle 11 at the rear of the quill 12.
A chamfering tool 19 is fixed to one end. Further, a key groove 20 is formed in the holder 17, and when the key 21 engages with this key groove 20, the holder 17 is prevented from rotating, and by bringing the key 21 into contact with the front and rear ends of the key groove 20, The chamfering tool 19 can be placed in two positions: a first machining position and a second machining position that is set back from the first machining position.

A first operating shaft 30 is supported by the second operating shaft 14 and the quill 12 so as to be able to move forward and backward in the axial direction, and a first cylinder device 31 is connected to the rear end of the first operating shaft 30. has been done. A taper 32 is formed at the tip of the first operating shaft 30, and one end of a movable pin 33 is in contact with this taper 32. This movable pin 33 is held at the tip of the quill 12 so as to be movable in the radial direction, and the other end of the movable pin 33 comes into contact with a bite holder 34. The bite holder 34 has one end attached to the quill 12,
The other end is movable in the radial direction.
A finishing boring bit 35 is attached to the other end. A semi-finishing boring tool 36 is fixed to the quill 12 on the opposite side to the finishing boring tool 35 slightly closer to the second chamfering tool 19.

The shaft head 10 is provided with a shaft head cylinder device 37 that moves the shaft head 10 forward and backward parallel to the axis of the spindle 11.
are connected to each other, and a cylinder block W is loaded and unloaded on the side where the shaft head 10 is advanced. In the figure, the two-dot chain line indicates the cylinder block Wa having a deep boring depth.

Next, the operation will be explained based on the above-described configuration. When the cylinder block W having a shallow boring depth is loaded, the second cylinder device 15 is operated and the second operating shaft 14 is moved forward. The holder 17 moves forward in conjunction with the forward movement of the second operating shaft 14,
The forward movement of the holder 17 is stopped with the key 21 being pressed against the rear end of the key groove. At this time, the chamfering tool 19 assumes the first machining position. In this state, the spindle 11 is rotated by the motor 13, and the shaft head 10 is advanced by the shaft head cylinder device 37. As a result, first, the boring tool 36 for semi-finishing
A semi-finishing boring process is performed by this, and the mouth of the bore is chamfered near the forward end of the shaft head 10 using a chamfering tool 19.

When the forward end of the shaft head 10 is confirmed, the first cylinder device 34 is activated and the first operating shaft 30 is moved backward. As a result, the finishing boring bit 35 is pushed out, and in this state, the finishing boring bit 3 is moved backward while rotating the quill 12.
5, the finishing boring of the bore is performed.
When the retreating end of the shaft head 10 is confirmed, the first operating shaft 3
0 advances, the finishing boring tool 35 is released, and the rotation of the spindle 11 is stopped.
Next, when the cylinder block Wa with a deep boring depth is loaded, the second workpiece discrimination signal is activated.
The cylinder device 15 operates and the second operating shaft 14
is retreating. As a result, the holder 17 is moved backward, and the backward movement of the holder 17 is stopped with the key 21 being pressed against the front end of the key groove 20. At this time, the chamfering tool 19 assumes the second machining position. When the spindle 11 is rotated and moved forward in such a state, semi-finishing boring is first performed by the semi-finishing boring tool 36, and the first
The cylinder block Wa is cut by the chamfering tool 21.
The mouth of the bore is also chamfered. When the forward end of the shaft head 10 is confirmed, the finishing boring bit 35 is pushed out, and in this state, the finishing boring bit 3 is moved back while rotating the quill 12.
5, the finishing boring of the bore is performed. In this way, by providing the chamfering tool 19 so that it can move forward and backward into two positions, the first machining position and the second machining position that is set back from the first machining position, it is possible to drill a deep hole with one boring tool. Capable of chamfering and boring the mouth of two types of cylinder blocks with different sizes.

<Effects of the Invention> As described above, the present invention provides a boring tool at the front part of the quill, fixes a first chamfering tool to the rear part of the quill, and fixes a boring tool to the rear part of the quill. The second chamfering tool, which performs chamfering on the boring tool side, can be moved forward and backward into two positions: the first processing position and the second processing position, which is retreated from the first processing position, by advancing and retracting the operating shaft. This feature allows chamfering to be performed at the same time as hole drilling, and two types of workpieces with different boring depths can be processed with one machine, which has the advantage of reducing machine space and cost. can get.

[Brief explanation of the drawing]

The drawing shows an embodiment of the present invention, and is a sectional view of a boring device. 10... shaft head, 11... spindle, 12...
Quill, 14... Second operating shaft, 17... Holder, 19... Chamfering bite, 20... Keyway, 2
1... Key, 30... First operating shaft, 35... Boring tool for finishing, 36... Boring tool for semi-finishing, W, Wa... Cylinder block.

Claims (1)

[Claims] 1. A spindle is rotatably supported on a shaft head that moves forward and backward relative to the workpiece, a quill is fixed to the tip of the spindle, and an operating shaft is inserted between the main shaft and the quill in the axial direction. A driving device is provided to move the operating shaft forward and backward through the quill, a boring tool is provided at the front of the quill, and a chamfering tool for chamfering is provided at the rear of the quill to move the operating shaft forward and backward. A boring device equipped with a chamfering tool that can be moved forward and backward in conjunction with a first machining position or a second machining position that is retreated from the first machining position. 2. A boring device equipped with a chamfering tool according to claim 1, wherein the boring tool is fixed to the front part of a quill. 3. A boring device equipped with a chamfering tool according to claim 1, wherein the boring tool is provided movably in the radial direction at the front part of the quill.