JPH0366089B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention is applicable to a plurality of holes arranged at predetermined intervals on a straight line, such as a camshaft bearing hole of a cylinder head or a crankshaft bearing hole of a cylinder block in an engine. The present invention relates to a so-called line boring machine for boring a hole.

(Prior Art) Conventionally, as a device for line boring a work, as disclosed in Japanese Utility Model Application No. 57-173909, a through-hole of a work positioned and fixed on a table is drilled from one side. By holding the tip of the inserted boring quill with a receiving member provided on the other side of the workpiece through-hole, the axis of rotation of the boring quill will not deviate even if cutting resistance acts on the boring quill during machining. It is known that the hole is positioned corresponding to the center line of the through hole to improve the machining accuracy of the workpiece. Usually, such equipment is specialized for line boring processing.

(Problem to be Solved by the Invention) By the way, when performing not only the line boring process as described above but also other machining operations on one workpiece, these machining operations are performed by one machine, for example, MC.
If the processing can be performed continuously using a processing device such as a machining center (machining center), it is useful in terms of simplifying the processing device.

However, since such machining equipment performs various machining operations on one workpiece, it is necessary to make the machining posture of the workpiece relative to the main axis variable, so when line boring the workpiece,
In order to eliminate vibrations in the rotational axis of the boring quill, it is necessary to move the receiving member like the conventional example above that holds the tip of the boring quill in response to changes in the machining posture of the workpiece, which makes the receiving member and its movement mechanism complicated. This results in an increase in the size of the device.

Furthermore, depending on the machining posture of the workpiece, a situation may occur in which the tip of the boring quill cannot be held properly by the receiving member, and in this case, the cutting resistance acting on the boring quill during machining may cause the boring quill to axially shift. Therefore, the workpiece cannot be machined with high precision.

The present invention has been made in view of the above, and an object of the present invention is to perform line boring on a plurality of workpiece holes located on a straight line using a machining device such as the above-mentioned MC. By providing a means for positioning the rotational axis of the quill corresponding to the center line of each hole of the workpiece in association with a clamper that clamps the workpiece, the rotational axis of the boring quill can be adjusted even if the machining posture with respect to the main axis of the workpiece changes. This ensures that the center of the workpiece is always aligned with the center line of each hole in the workpiece, thereby simplifying the device and improving the machining accuracy of the workpiece without providing a complicated movement mechanism for the receiving member. It's about being able to run.

(Means for Solving the Problems) In order to achieve the above object, the solving means of the present invention is to line each hole of a workpiece having a plurality of holes provided at predetermined intervals on a straight line. As a boring device, a rotary table having a workpiece pedestal on which the workpiece is placed is provided, and a clamper for clamping the workpiece in a direction orthogonal to the center line of each hole is rotatably provided on the rotary table. Furthermore, when clamping, a guide member is inserted between adjacent holes so that the tip faces an intermediate position on the center line of each hole of the workpiece, and the guide member is placed in the clamper so that the guide member is positioned at the center of rotation of the rotary table. establish. In addition, it extends in the same direction as the center line of each hole of the workpiece, and when clamped,
A guide hole whose center line is positioned corresponding to the center line of each hole of the workpiece is provided at the tip of the guide member. In addition, the effective length is set to approximately half the length in the center line direction of each hole of the workpiece, and a cutting tool corresponding to each hole of the workpiece is provided on the circumferential surface, and a guide of the guide member is provided at the tip. A boring quill having a guide portion that is fitted and supported in a hole, and a boring means that rotatably supports the boring quill are provided. In this case, the rotary table is configured to be reversible between a first position on one end of the work and a second position on the other end of the work, which are located on an extension of the rotation axis of the boring quill.

(Function) With the above configuration, in the present invention, a boring quill is inserted into a plurality of holes of a work clamped by a clamper, and line boring is performed in each of the holes by rotation of the boring quill.

At this time, the guide part at the tip of the boring quill is fitted and supported in the guide hole of the guide member with its center line positioned corresponding to the center line of each hole of the workpiece, so that the guide part at the tip of the boring quill is not cut into the boring quill during processing. Even if resistance acts, the rotational axis of the boring quill will not deviate, thereby improving the machining accuracy of the workpiece.

In addition, the guide portion at the tip of the boring quill is fitted and supported in the guide hole of the guide member provided in the clamper, so the boring quill can be properly held without being affected by changes in the machining posture of the workpiece. The axis of rotation can always be reliably aligned with the center line of each hole in the workpiece.
Therefore, there is no need to employ a complicated mechanism for preventing the shaft center of the boring quill from wobbling, and the apparatus can be simplified.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

FIG. 1 and FIG. 2 show a processing device A according to an embodiment of the present invention, and the processing device A has four camshaft bearing holes h ₁ to 4 holes provided at predetermined intervals on a straight line. 3 as a workpiece with h ₄
Line boring is performed on the cylinder head W for a cylinder engine.

The processing device A is equipped with a tool exchange magazine 2 on the main shaft 1 side as a boring processing means that rotatably supports various processing tools such as a boring quill T ₁ and a drill T ₂ . , various processing tools such as the boring quill T ₁ and the drill T ₂ are arranged so as to be clampable and unclampable by clamp claws 3, 3, ... (only one is shown in the figure), and the above-mentioned main shaft 1 On the other hand, tools such as the boring quill T ₁ and the drill T ₂ are replaceable. In other words, this machining device A has the function of a machining center capable of performing various machining operations on the cylinder head W in addition to line boring.

On the other hand, reference numeral 4 denotes a rotary table which is rotatable through 180 degrees around the rotation axis by driving of a motor 5, and 6 is a supporting member fixedly fixed to the rotary table 4 so as to be integral with the rotary table 4. are the first position on one end side of the cylinder head W (bearing hole _h1 side) located on the extension line of the rotational axis of the boring quill _T1 , and the second position on the other end side of the cylinder head W (bearing hole _h4 side).
It is provided so that it can be reversed between positions. Also,
At the upper end of the support member 6, there is a workpiece pedestal 7 on which the cylinder head W is positioned and placed at the processing position.
are fitted and supported, and the machining attitude of the cylinder head W placed on the pedestal 7 is changed by 180 degrees in the horizontal plane by the rotation of the rotary table 4, that is, it is reversed. In addition, the rotary table 4
The reversing operation may be reciprocating 180 degrees in the forward and reverse directions around the rotation axis, or it may be rotatable 360 degrees around the rotation axis and reversing 180 degrees in the same direction. Good too.

Further, above the workpiece holder 7, a fluid pressure cylinder 9 is connected to the rotary table 4 with a bracket 8.
A piston rod 9a is disposed so as to be rotatably supported through the piston rod 9a and extends downwardly of the hydraulic cylinder 9.
At the tip, there is a cylinder head W on the workpiece pedestal 7.
A clamper 10 for pressing and clamping the bearing holes h ₁ to _{h 4} of each of the bearing parts w ₁ to w ₄ from a direction (above) perpendicular to the center line is connected, whereby the clamper 10 is connected to the rotary table. It is rotatably supported by 4. On the lower surface of the clamper 10, there are pressing members 12 extending downward on both left and right sides in the figure.
12 is elastically supported via a spring 11, and a guide member 13 extending downward in the center is fixed to be located at the center of rotation of the rotary table 4. teeth,
A guide hole 13a is formed to extend horizontally on a straight line connecting the pressing members 12, 12, that is, in the same direction as the center line of the various receiving holes _h1 to _h4 of the cylinder head W. Then, the clamper 10 is lowered by the extension operation of the fluid pressure cylinder 9, and the pressing members 12, 12 are used to push the outer two bearings of the four camshaft bearings w1 _{to w4 of} the cylinder head W. While pressing and clamping w ₁ and w ₄ from above, the two adjacent inner bearings are placed so that the tip of the guide member 13 faces on the center line of each bearing hole h ₁ to _{h 4} of the cylinder head W. Department
It is inserted between w ₂ and w ₃ , and the center of the tip guide hole 13a is inserted into the bearing hole of each of the bearing parts w ₁ to w ₄ .
They are arranged to correspond to the centers of h ₁ to _{h 4} .

On the other hand, the effective length of the boring quill T ₁ attached to the main shaft 1 is set to approximately half the total length of the cylinder head W (the length of each bearing hole h ₁ to _{h 4} in the center line direction). The guide member 13 is installed at the tip.
A guide portion t1 having a slightly smaller diameter than the inner diameter of the guide hole 13a is formed, and by inserting this guide _{portion t1} into the guide hole 13a, each bearing hole _h1 of the cylinder head W is connected to the clamper 10. _-h4 are fitted and supported at an intermediate position on the center line, and in this state, the rotation axis of the boring quill _T1 is positioned corresponding to the center line of each bearing hole _h1 - _h4 .

In addition, t ₃ , t ₃ , t ₃ are the above boring quill T ₁
Three cutting tools are embedded at a predetermined interval in the axial direction on one side of the outer periphery of the large diameter portion _t2 excluding the guide portion _t1 of the cylinder head W, corresponding to each of the bearing holes _h1 to _h4 of the cylinder head W. carbide chips, and each of the carbide chips
At _t3 , the above-mentioned bearing holes _h1 to _h4 are bored in two steps: bearing holes _h1 and _h2 on the right side of the center in the figure and bearing holes _h3 and _h4 on the left side.

Next, the procedure will be explained.

(1) First, place the cylinder head W on the workpiece pedestal 7, and press the hydraulic cylinder 9 located above it.
The clamper 10 is lowered by the extension operation, and the bearing parts w ₁ and w ₄ located on the left and right outer sides of the cylinder head W are pressed and clamped from above by the pressing members 12 and 12. Then, along with the clamping operation of the clamper 10, the guide member 13 also descends, and the leading end of the guide member 13 is located inside the cylinder head W to the bearing parts w ₂ and w _{3 .}
is inserted between the guide members 1 and 1.
The center of the guide hole 13a of No. 3 is located at each of the above-mentioned bearing parts w ₁ ~
It is positioned corresponding to the center of bearing holes h ₁ to _{h 4} of w ₄ .

(2) Next, move the main spindle 1 on which the boring quill T ₁ is attached to the processing position corresponding to the workpiece holder 7, and place the boring quill T ₁ on the workpiece W.
The tip guide portion t 1 is inserted into the two bearing holes h ₁ and h ₂ on the main shaft 1 side to fit and support the tip guide portion t ₁ in the guide hole 13 a of the guide member 13 . At this time, the rotation axis of the boring quill T ₁ is aligned with each bearing hole h ₁ , h ₂ so that the tip t ₃ on the tip side of the boring quill T ₁ does not interfere with the bearing hole h ₁ on the front side (outer side) of insertion.
After inserting the chips slightly eccentrically toward the rear side with respect to the center of the boring quill T 1 , after each of the chips T ₃ is positioned at a fixed position immediately in front of the corresponding bearing holes h ₁ and h ₂ , the boring quill T ₁ is inserted. The axis of rotation of the boring quill T 1 is made to correspond to the center of each bearing hole h ₁ , h ₂ , and then the boring quill T ₁ is further advanced slightly to fit and support the leading end guide portion t ₁ into the guide hole 13a. do.

(3) After that, drive the main shaft 1 to create a boring quill.
By rotating and reciprocating T ₁ , each chip t ₃ opens two bearing holes on the spindle 1 side.
Boring h ₁ and h ₂ .

(4) When the machining of the right two bearing holes h ₁ and h ₂ of the four bearing holes h 1 to h ₄ of the cylinder head W is completed in this way, the main shaft ₁ is moved back and the boring quill T ₁ is Take it out from each of the bearing holes h ₁ and h ₂ above, and then take it out from the two bearing holes h ₃ on the left side,
In order to process h ₄ , the rotary table 4 is rotated 180° by the drive of the motor 5 to direct the two bearing holes h ₃ and h ₄ on the left side toward the spindle 1, and then the above (2), ( Boring both bearing holes h ₃ and h ₄ as in step 3).

(5) When the machining of the above-mentioned both side bearing holes h ₃ and h ₄ is completed, the boring quill T ₁ is taken out from the bearing holes h ₃ and h ₄ by the backward movement of the main shaft 1, and then,
The clamper 10 is raised by the contraction operation of the fluid pressure cylinder 9 to release the clamped state against the cylinder head W, and the guide member 13 is taken out from between the bearing parts w ₂ and w ₃ , and then the cylinder head W is moved to receive the workpiece. It is taken out from the stand 7 and the next cylinder head W is machined in the same manner as above.

Therefore, in this embodiment, when boring the cylinder head W, the tip guide portion _t1 of the boring quill _T1 is fitted into the guide hole 13a of the guide member 13 in the middle of the cylinder head W, and the boring quill T1 is fitted into the guide hole 13a of the guide member 13 in the middle of the cylinder head W. The boring quill _{T 1} is supported by the clamper 10 so that its rotation axis corresponds to the center line of each bearing hole h ₁ to _{h 4} of the cylinder head W, so cutting resistance acts on the boring quill T ₁ during machining. However, the rotational axis of the boring quill _T1 does not deviate, so that the machining accuracy of the cylinder head W can be improved.

Moreover, even if the machining posture of the cylinder head W is changed by the simple means of fitting the tip guide portion t ₁ of the boring quill T ₁ into the guide hole 13a of the guide member 13 as described above, the boring quill T ₁ can prevent shaft center wobbling,
The device can be simplified.

Furthermore, since various tools can be exchanged on the spindle 1 using the magazine 2, machining other than boring can be performed with one device, resulting in great versatility.

In the above embodiment, the cylinder head W is shown as the workpiece, but the workpiece is not limited to this, and any type of workpiece may be used as long as it has a plurality of holes in a straight line, such as a cylinder block.

(Effects of the Invention) As described above, according to the present invention, the tip guide portion of the boring quill that is inserted into a plurality of holes in a workpiece to process each hole is connected to a guide member provided in a workpiece clamper. Since the rotation axis of the quill is fitted and supported in the guide hole at an intermediate position on the center line of each hole so that the center line of each hole of the workpiece corresponds to the center line of each hole, the axis of the quill will not be shaken during machining. It is possible to improve the machining accuracy of the workpiece without causing this problem.

In addition, the axis of rotation of the boring quill can always be reliably positioned corresponding to the center line of each hole of the workpiece by simply fitting and supporting the tip guide portion of the boring quill into the guide hole of the guide member. Therefore, the device can be simplified.

[Brief explanation of drawings]

FIG. 1 is a side view showing a main part of a line boring processing apparatus according to an embodiment of the present invention in cross section, and FIG. 2 is a plan view thereof. DESCRIPTION OF SYMBOLS 1...Main shaft (boring processing means), 4...Rotary table, 7...Work holder, 10...Clamper, 13...Guide member, 13a...Guide hole, _T1 ...Boring quill, _t1 ... ...Guide section,
t ₃ ... Carbide tip (cutting tool), W ... Cylinder head (workpiece), h ₁ to _{h 4} ... Bearing hole (hole).

Claims (1)

[Claims] 1. An apparatus for line boring each hole of a workpiece having a plurality of holes provided at predetermined intervals in a straight line, the apparatus comprising: a rotary table having a workpiece pedestal on which the workpiece is placed; a clamper that is rotatably provided on the rotary table and clamps the work from a direction perpendicular to the center line of each hole; a guide member inserted between adjacent holes such that the guide member faces an intermediate position on the center line of each hole of the work, and a distal end of the guide member; A guide hole that extends in the same direction and whose center line is positioned corresponding to the center line of each hole of the workpiece when clamped, and a guide hole whose effective length is set to approximately half the length in the direction of the center line of each hole of the workpiece. , and a boring quill having a cutting tool corresponding to each hole of the workpiece on the circumferential surface and a guide portion at the tip that is fitted and supported in the guide hole of the guide member, and a boring that supports the boring quill in a rotatable unit. The rotary table is provided to be reversible between a first position on one end of the workpiece and a second position on the other end of the workpiece, which are located on an extension of the rotation axis of the boring quill. A line boring processing device characterized by: