JPH0446683B2 - - 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> In the above example, there is no problem if one type of cylinder block flows into the machine, but if the cylinder blocks have different heights and there is a protrusion A at the end of the bore. In some cases, especially when boring and chamfering V-type multi-cylinder engine blocks, changing the forward end position of the boring spindle in order to chamfer the mouths of cylinder blocks of different heights using the same chamfering tool is This is not possible because the tip of the quill or the boring tool interferes with the protrusion A. For this reason, in the past, it was necessary to install a separate machine equipped with boring tools with different distances between the boring tool and the chamfering tool, which posed the problem of increasing machine space and increasing costs.

<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 first chamfering tool provided at the rear of the quill. A second chamfering tool that is fixed and performs chamfering on the boring tool side with respect to the first chamfering tool is provided so that it can be moved to a machining position or a position where it does not interfere with the workpiece by moving the operating shaft forward and backward. It is something that

<Function> With the above-described configuration, for a workpiece with a shallow boring depth, the operating shaft is operated to position the second chamfering tool at the machining position, and the boring tool is used to perform boring processing. Perform chamfering using the 2nd chamfering tool. When a workpiece with a deep boring depth comes to the workpiece, move the second chamfering tool to a position where it will not interfere with the workpiece, and use the boring tool to perform the boring while simultaneously chamfering with the first chamfering tool. .

<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 recessed portion 16 is formed at the tip of the second actuating shaft 14, and this recessed portion 16
The convex portion 18 of the rotary holder 17 is engaged with the rotary holder 17 .
The rotation holder 17 is rotatably supported at the rear of the quill 12 about an axis perpendicular to the rotation axis of the spindle 11, and has a second chamfering tool 19 at one end.
is fixed. A contact portion 20 is formed at the other end of the rotary holder 17 to abut against the quill 12 in order to prevent the rotary holder 17 from rotating counterclockwise beyond a predetermined angle. A first chamfering tool 21 is fixed to the quill 12 on the rear side of the second chamfering tool 19.

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 chain of two points indicates a cylinder block Wa with 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 activated and the second operating shaft 14 is moved forward. As the second operating shaft 14 moves forward, the rotary holder 17 rotates counterclockwise, and the contact portion 20 is pressed against the quill 12 . 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, semi-finishing boring is performed using the semi-finishing boring tool 36, and the mouth of the bore is also chamfered near the forward end of the shaft head 10 using the second chamfering tool 19. At this time, the first chamfering tool 21
does not chamfer the bottom of the eyelid on the rear side of the second chamfering bit 19.

When the forward end of the shaft head 10 is confirmed, the first cylinder device 31 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
retreats. As a result, the rotary holder 17 rotates clockwise, and the second chamfering tool 19 is released from the machining position. When the spindle 11 is rotated and moved forward in this state, semi-finishing boring is first performed by the semi-finishing boring tool 36, and the mouth of the bore is also chamfered by the first chamfering tool 21 near the forward end of the shaft head 10. Ru. At this time, the second chamfering tool 19 is moved together with the rotating holder 17 to a position where it does not interfere with the cylinder block Wa. When the forward end of the shaft head 10 is confirmed, the finishing boring bit 35 is pushed out, and in this state, the quill 12 is rotated and retreated, so that the finishing boring bit 35 performs finishing boring of the bore. Quill 1 like this
2, fix the first chamfering tool 21 to the
By providing a second chamfering bit 19 that can chamfer or escape the mouth in front of the chamfering bit 21, it is possible to chamfer the mouth and bored two types of cylinder blocks with different boring depths with one boring tool. It can be performed.

The present invention is not limited to the embodiments described above, but as shown in FIG.
2 may be placed in two positions: a processing position and a relief position.

<Effects of the Invention> As described above, in the present invention, a boring tool is provided at the front part of the quill, a first chamfering tool is fixed to the rear part of the quill, and a boring tool is attached to the first chamfering tool. The second chamfering tool, which performs chamfering on the cutting tool side, is installed so that it can be moved to the machining position or a position where it does not interfere with the workpiece by moving the operating shaft forward and backward, so chamfering can be performed at the same time as hole drilling. Moreover, since two types of workpieces with different boring depths can be machined with one machine, the space of the machine can be reduced and costs can be reduced.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a cross-sectional view of a boring device, and FIG. 2 is a cross-sectional view of a boring device that is another embodiment. 10... shaft head, 11... spindle, 12...
Quill, 14... Second operating shaft, 19, 42...
2nd chamfering tool, 21... first chamfering tool, 30... first operating shaft, 35... finishing boring tool, 36... semi-finishing boring tool,
W, Wa...Cylinder block.

Claims (1)

[Claims] 1. A spindle is rotatably supported on a shaft head that advances and retreats 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 first chamfering tool is fixed to the rear of the quill. A chamfering tool is provided so that a second chamfering tool, which performs chamfering on the side of the boring tool, can be moved to a machining position or a position where it does not interfere with the workpiece by advancing and retracting the operating shaft. Boring equipment. 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.