JPH05212609A - Valve seat hole machining device - Google Patents

Abstract

PURPOSE:To use a cutting tool having a cutting edge part with smaller diameter than that of a worked hole for working with low cutting resistance by disposing a spindle supported by a quill rotatably on the axis eccentric to the quill while being provided on the tip with the cutting tool to revolve and rotate the cutting tool on its own axis. CONSTITUTION:A quill 10 is supported by a quill carrier part 7, while a means 16 for driving rotatably the quill is rotated relative to the quill carrier part 7, a means 13 for moving forward and backward the quill is moved forward and backward relative to the quill carrier part 7. Then, a means for rotatably driving a spindle rotatably drives the spindle 12 supported rotatably by the quill on the axis B eccentric to the quill to rotate a cutting tool 11 provided on the tip of the spindle. As a result, the cutting tool is rotated on its own axis and spindle's axis, while revolving around the axis of the quill to advance so that a valve seat hole 5b is bored in a cylinder head of a cylinder block 15 integral therewith.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a machining device used for boring a valve seat hole in a cylinder head of a cylinder block integrated with a cylinder head of an engine.

[0002]

2. Description of the Related Art Conventionally, as a processing apparatus used for boring a valve seat hole in an engine cylinder head, for example, there is one shown in FIG. This valve seat hole drilling device is a cutting tool 1 with the same diameter as the drilled hole diameter.
It supports a spindle 2 equipped with at the tip end so that it can rotate and move back and forth, and the valve seat hole 3a to be machined on the same axis as the spindle 2 is aligned and positioned.
When the cylinder head 3 is arranged and fixed by the fixing jig 4 having a hole in an inclined state with its cylinder block mounting surface side facing the spindle 2, the spindle 2 is rotated and moved back and forth, and the cutting tool 1 causes the valve seat to move. Perform boring cutting of hole 3a.

[0003]

By the way, in the conventional machining apparatus described above, when the valve seat hole is cut in the cylinder head of the cylinder head integrated type cylinder block in which the cylinder head and the cylinder block are integrally formed. Is a spindle 2 equipped with a cutting tool 1 at the tip.
Needs to be inserted into the cylinder bore from the crankcase side of the cylinder block and processed.

However, in the above-mentioned conventional processing apparatus, since the cutting tool 1 having the cutting edge portion having the same diameter as the processing hole diameter is used, the cutting resistance at the time of cutting the valve seat hole becomes large, so that it becomes thick. It is necessary to ensure the supporting rigidity of the cutting tool 1 by means of the short spindle 2 which is too thick and too short to be inserted into the cylinder bore, and as described above, the cylinder head integrated cylinder block. There was a problem that it could not be used for cutting valve seat holes in the cylinder head.

In order to solve this problem, it is conceivable to use a thin and long spindle in place of the spindle 2 in the processing device and insert it into the cylinder bore for processing. There is a problem in that the supporting rigidity of the cutting tool 1 is insufficient, and the runout of the tool causes a problem such as a decrease in machining accuracy and a shortened tool life.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a processing apparatus that advantageously solves the problems of the conventional apparatus described above. The valve seat hole processing apparatus of the present invention rotates a quill. And a gear head main body having a quill receiving portion for movably supporting the quill receiving portion and the quill receiving portion so that the quill is aligned with the valve seat hole for cutting of the cylinder head integrated cylinder block on the same axis. A quill receiving portion inclination arranging means arranged in the cylinder bore of the cylinder block, a spindle rotatably supported on the quill on an axis eccentric to the quill, and a tip equipped with a cutting tool; A quill advancing / retreating drive means provided on the gear head main body for advancing / retreating the quill with respect to the quill receiving portion in the axial direction thereof. , It provided in the gear head body,
The quill rotation driving means for rotating the quill with respect to the quill receiving portion, and the spindle rotation driving means provided on the gear head main body for rotating the spindle with respect to the quill.

Further, in the present invention, the quill receiving portion sloping arrangement means is arranged such that the quill receiving portion inserted into the cylinder bore is aligned with the quill on the same axis as the valve seat hole. The quill receiving portion fixing means for fixing and the quill receiving portion advancing / retreating moving means for advancing / retreating the quill receiving portion between a position in the cylinder bore and a position removed from the quill receiving portion may be provided. Receiving part inclination arranging means supports the quill receiving part so as to be swingable with respect to the axis of the cylinder bore, and the axis of the cylinder bore is positioned so that the quill is aligned with the valve seat hole. And a quill receiving portion tilting means for rocking the quill receiving portion tilting means with respect to the cylinder block. A triaxial moving means for moving to an arbitrary position in the axial direction of A to three orthogonal axial directions and uniaxial may be one comprising a.

Further, in the present invention, the spindle may be equipped with the cutting tool detachably via an automatic tool changing means.

[0009]

In such an apparatus, the quill receiving portion inclination arranging means positions the quill receiving portion of the gear head main body so that the quill is aligned on the same axis as the valve seat hole to be machined in the cylinder head integrated cylinder block. The quill rotation drive means rotates the quill supported by the quill receiving portion relative to the quill receiving portion while the quill advancing / retreating driving means moves forward relative to the quill receiving portion. Accordingly, the spindle rotation drive means rotationally drives the spindle rotatably supported by the quill on an axis that is eccentric to the quill, and rotates the cutting tool equipped at the tip of the spindle. , Which allows the cutting tool to revolve around the spindle axis and at the same time revolve around the quill axis. And al advanced and boring cutting the valve seat hole in the cylinder head of the cylinder head integral cylinder block.

When the machining is completed, the quill advancing / retreating driving means moves the quill together with the spindle back and forth with respect to the quill receiving portion to extract the cutting tool from the machined valve seat hole, and then the quill receiving portion inclined arranging means. Pull the receiving part out of the cylinder bore of the cylinder block.

Therefore, according to the processing apparatus of the present invention, the cutting tool is rotated and revolved like a pinion of a planetary gear set for processing, so that a cutting tool having a cutting edge portion having a diameter smaller than the diameter of the processing hole is used. It is possible to perform machining with low cutting resistance. Therefore, when performing valve seat hole machining of a cylinder block with integrated cylinder head, a long and thin spindle or a spindle that is long enough for the cutting tool to reach the valve seat hole position to be machined Even if a quill is used, high-precision machining can be performed and the tool life can be sufficiently secured.

In addition, the quill receiving portion inclined arrangement means is
A quill receiving part fixing means for fixing the quill receiving part inserted in the cylinder bore in a state where the quill is positioned in alignment with the valve seat hole on the same axis, and a position where the quill receiving part is located in the cylinder bore and pulled out therefrom. And a quill receiving portion moving means for moving the quill receiving portion forward and backward between the cutting tool and the cutting tool after moving the quill receiving portion forward and backward moving means to a position in the cylinder bore. During cutting by, the quill receiving part fixing means fixes the quill receiving part with the quill aligned with the valve seat hole and positioned, and when the cutting process is completed,
After the quill receiving part fixing means releases the fixing of the quill receiving part, the quill receiving part advancing / retracting moving means moves the quill receiving part backwards to the position where the quill receiving part comes out of the cylinder bore, so that higher tool support rigidity can be obtained during cutting. With
Automation of valve seat hole drilling is achieved.

Further, the quill receiving portion inclined arranging means supports the quill receiving portion so as to be swingable with respect to the axis of the cylinder bore, and the quill receiving portion is arranged so that the quill is aligned with the valve seat hole on the same axial line. A quill receiving portion tilting means for rocking with respect to the axis of the cylinder block, and a triaxial moving means for moving the quill receiving portion tilting means with respect to the cylinder block to arbitrary positions in orthogonal three axial directions with the axial direction of the cylinder bore as one axis. , Even when there are multiple types of cylinder head-integrated cylinder blocks with different valve grip angles and cylinder bore pitches, it is possible to process the valve seat holes of the cylinder heads of those multiple types of cylinder blocks. Automation can be easily achieved.

When the spindle is equipped with a cutting tool detachably via the automatic tool changing means, the cutting tool can be easily replaced automatically. Therefore, for example, the intake valve side and the exhaust valve side can be replaced. As described above, a plurality of types of valve seat holes having different machining diameters can be easily and automatically machined.

[0015]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a cross-sectional view showing an embodiment of the valve seat hole machining apparatus of the present invention. In FIG. 1, 5 is a cylinder head integrated cylinder block, and 6 is a machining apparatus of the embodiment.

Valve seat hole drilling device 6 of this embodiment
Includes a gear head body 8 having a quill receiving portion 7 having a cylindrical end portion 7a. The quill receiving portion 7 has a side portion of the distal end portion 7a which is circumferentially equidistant as a quill receiving portion fixing means. Are provided with three lock pins 9 that move forward and backward by hydraulic pressure, and inside the quill receiving portion 7,
A quill support hole 7b is formed through which the axial quill 10 is inserted and which supports the quill so that the quill can be rotated and moved back and forth.

Here, as shown in FIG. 1, the tip end portion 7a of the quill receiving portion 7 of the quill supporting hole 7b is inserted into the cylinder bore 5a of the cylinder block 5 at a predetermined circumferential position, so that the lock pin 9 is secured. When fixed in the cylinder bore 5a concentrically with it by advancing, the quill support hole 7b
The quill 10 supported by the quill receiving portion 7 is arranged so as to be aligned with the valve seat hole 5b of the cylinder block 5 which is to be machined and is aligned with the axis of the tip portion 7a of the quill receiving portion 7. And inside the quill 10,
Spindle 12 equipped with a cutting tool 11 that has a cutting edge with a diameter smaller than the diameter of the valve seat hole 5b and is detachably attached to the tip.
Is rotatably supported on an axis B which is eccentric by a predetermined distance S with respect to the axis A of the quill 10.

Further, in the base portion 7c of the quill receiving portion 7, a cylinder portion 7d having an inner diameter larger than that of the quill supporting hole 7b is provided following the rear end portion (the right end portion in FIG. 1) of the quill supporting hole 7b. On the other hand, on the outer peripheral surface near the rear end of the quill 10, there is formed an outer peripheral flange-shaped piston portion 10a slidably fitted in the cylinder portion 7d, and the outer peripheral surface of the piston portion 10a is formed. An outer peripheral groove into which an O-ring is fitted is provided on the upper side, whereby these cylinder portions 7d
And the piston portion 10a are liquid-tightly fitted to each other,
Quill forward / backward drive cylinder 13 as quill forward / backward drive means
The quill advancing / retreating drive cylinder 13 advances the quill 10 by supplying hydraulic pressure to the chamber behind the piston part 10a in the cylinder part 7d, and conversely, the chamber in front of the piston part 10a in the cylinder part 7d. The quill 10 can be retracted by supplying hydraulic pressure to the quill.

A gear housing 14 is fixed to the end surface of the base portion 7c of the quill receiving portion 7, while a driven gear 10b is formed at the rear end portion of the quill 10, and the driven gear 10b has a gear housing. A support shaft that is housed in the housing 14 and has one end rotatably supported by the gear housing 14 and the other end rotatably supported by the base 7c.
The quill drive gear 15 which has 15a integrally is meshed,
The quill drive gear 15 is connected to an output shaft 16a of a quill rotation drive motor 16 serving as a quill rotation drive means provided outside the gear housing 14 via a support shaft 15a, whereby the quill rotation gear 15 is rotated. Drive motor 16
Can rotationally drive the quill 10 via the quill drive gear 15 and the driven gear 10b.

In addition, a driven gear 17 is provided at the rear end of the spindle 12, and the driven gear 17 is provided with a support shaft 18a housed in the gear housing 14 and rotatably supported by the gear housing 14. The inner teeth 18b of the integrally held idler gear 18 are meshed with each other, and the outer teeth 18c of the idler gear 18 are also housed in the gear housing 14 and one end of which is rotatably supported by the gear housing 14 and the other. A support shaft whose end is rotatably supported by the base 7c.
A spindle drive gear 19 integrally having 19a is meshed, and the spindle drive gear 19 is a gear housing.
The support shaft is attached to the output shaft 20a of the spindle rotation drive motor 20 as the spindle rotation drive means provided on the outer side of 14
19a, so that the spindle rotary drive motor 16 thereof is connected to the spindle 12 via a spindle drive gear 19, an idler gear 18, and a driven gear 17.
Can be driven to rotate.

The support shaft 18a for the idler gear 18
In consideration of the eccentricity of the spindle 12, the spindle driven by the spindle rotation drive motor 16 always engages the driven gear 17 and the internal teeth 18b regardless of the circumferential position of the quill 10.
Axle A of quill 10 to enable rotation of 12
It is located on the same axis as.

Further, the apparatus of this embodiment is provided with a normal NC actuating feed mechanism (not shown) for moving the gear head body 8 horizontally to an arbitrary position in the left-right direction in FIG. In this embodiment, the feed mechanism, together with the lock pin 9, constitutes a quill receiving portion sloping arrangement means.

In such a valve seat hole machining apparatus, the cylinder block 5 is fixed by the fixing jig 21 having holes.
When the crankcase side is arranged and fixed in a sideways state toward the gear head main body 8, the gear head main body 8 is moved forward horizontally to the left in FIG. 1 by the feeding mechanism, and the tip end portion 7a of the quill receiving portion 7 is The quill 10 is inserted into the cylinder bore 5a of the cylinder block 5, and then its tip end portion 7a is fixed in the cylinder bore 5a by the protruding lock pin 9 as described above, and is supported by the quill receiving portion 7 thereof. Are positioned on the same axis as the valve seat hole 5b of the cylinder block 5 to be cut, and then the quill 10 is driven by the quill rotation drive motor 16 to rotate and driven by the quill advancing / retreating drive cylinder 13. The spindle 12 is rotatably supported on the quill 10 by an eccentric axis with respect to the quill 10. Is moving, rotates together with the cutting tool 11 equipped at the tip, the cutting tool 11 at this
Rotates about the axis B of the spindle 12 and at the same time moves forward while revolving around the axis A of the quill 10, and the cutting edge portion of the quill cuts the valve seat hole 5b in the cylinder head of the cylinder block 5.

When the boring cutting process is completed,
The quill 10 is driven by the quill advancing / retreating drive cylinder 13 and retracts together with the spindle 12, so that the cutting tool 11 is extracted from the machined valve seat hole 5b, and then the lock pin 9 retracts. The main body 8 is horizontally moved backward, and the tip end portion 7a of the quill receiving portion 7 is extracted from the inside of the cylinder bore 5a, whereby the cylinder block 5 after processing can be carried out.

Therefore, according to the processing apparatus of this embodiment, since the cutting tool 11 is rotated and revolved like a pinion of a planetary gear set to perform boring, a cutting tool having a cutting edge portion having a diameter smaller than the diameter of the processing hole is used. 11 can be used for machining with low cutting resistance, and the quill receiving part 7 inserted into the cylinder bore 5a and fixed by the lock pin 9 supports the quill 10, and the quill 10 supports the spindle 12. Since it is possible to secure a high supporting rigidity, these points work together to achieve high precision machining when performing boring cutting of the valve seat hole 5a of the cylinder block 5 with integrated cylinder head. It can be performed automatically and the tool life can be sufficiently secured.

FIGS. 2 and 3 are a sectional view and a plan view showing another embodiment of the processing apparatus of the present invention. The apparatus of this embodiment supports the quill 10 while tilting it, and the lock pin 9 is provided. In place of the quill receiving portion 7 of the previous embodiment, the quill is swingable in the cylinder block 5.
The gear head main body 8 has a quill receiving portion 22 supporting the 10 concentrically and having a thin outer diameter, and further omitting the lock pin 9, but the other portions are configured in the same manner as in the previous embodiment.
And a tilt mechanism 23 as a quill receiving portion tilt means for swinging the gear head body 8 around a predetermined horizontal axis D shown in FIG.

Here, the tilt mechanism 23 is a column 24 that supports the gear head body 8 so as to be swingable around the axis D.
And a gear head tilt motor 25, which is provided in the column 24 and swings the gear head main body 8 around the axis D by an arbitrary angle, the gear head tilt motor 25 being constituted by a normal servomotor with a speed reducer. Based on the operation of 25, the gear head main body 8 and then the quill receiving portion 22
Cylinder block 5 arranged and fixed in the lateral direction as described above by a fixing jig 21 with holes so that the quill 10 is aligned and positioned on the same central axis A as the valve seat hole 5b.
With respect to the axis C of the cylinder bore 5a, it can be swung around the axis D.

The apparatus of this embodiment is shown in FIGS.
As shown in FIG. 5, the column 24 of the tilt mechanism 23 is arranged and fixed to the cylinder block 5 which is horizontally fixed by the fixing jig 21 having holes, and the extending direction of the axis C of the cylinder bore 5a which is horizontally arranged. Is the Z axis, and the vertical direction is the Y axis, and the horizontal direction orthogonal to the Z axis is the X axis that is the orthogonal three axis directions. It has a moving mechanism 26,
The three-axis moving mechanism 26 includes an X-axis motor 27, a Y-axis motor 28, and a Z-axis motor 29 for moving in the respective axial directions.

Further, in the apparatus of this embodiment, as shown in FIG. 2, the spindle 12 can attach and detach the cutting tool 11 via a normal automatic tool changing holder (ATC holder) 30 as an automatic tool changing means. This ATC holder 30 holds a pin projecting from the end of the shank supporting the cutting tool 11 by an air-pressure driven chuck and pulls the pin to bring the shank into close contact with the conical surface. The cutting tool 11 can be firmly held with high accuracy, and the pin can be pushed out by the chuck to open it, so that the cutting tool 11 can be replaced.

According to the apparatus of this embodiment, for example, as shown in FIG.
As shown by the solid line, after machining the intake valve side valve seat hole 5a forming an inclination angle α with respect to the axis C of the cylinder bore 5a, the quill receiving portion 22 is once extracted from the cylinder block 5, and the cutting tool 11 is removed. After automatically replacing the quill receiving portion 22 with a different machining diameter, insert the quill receiving portion 22 into the cylinder block 5 again, and incline the inclination angle β with respect to the axis C of the cylinder bore 5a.
Since it is possible to carry out a process such as processing the exhaust valve side valve seat hole 5a which forms the valve seat angle, the cylinder bore pitch,
Even when there are a plurality of types of cylinder head-integrated cylinder blocks 5 having different valve seat hole machining diameters, etc., it is possible to easily achieve automation of the machining of the valve seat holes 5a of the cylinder heads of the plurality of types of cylinder blocks 5. Therefore, for example, one station of a flexible transfer processing line (FTL) for processing a cylinder block integrated with a cylinder head can be configured.

Although the present invention has been described above based on the illustrated example, the present invention is not limited to the above-mentioned example. For example, the ATC holder 30 in the latter embodiment is provided with the spindle 12 and the cutting tool 11 in the former embodiment. May be provided between the cutting tool and the cutting tool so that the cutting tools 11 having different machining diameters can be automatically replaced.

[0032]

As described above, according to the valve seat hole drilling apparatus of the present invention, a cutting tool is rotated and revolved like a pinion of a planetary gear set for machining, so that a cutting edge portion having a diameter smaller than the hole diameter is used. A tool can be used to perform machining with low cutting resistance. Therefore, when machining a valve seat hole in a cylinder block with an integrated cylinder head, it is long enough for the cutting tool to reach the valve seat hole position for machining. Even if you use a thin spindle or quill,
It is possible to perform high-precision machining and ensure a long tool life.

The quill receiving portion sloping arrangement means fixes the quill receiving portion inserted into the cylinder bore in a state where the quill is positioned in alignment with the valve seat hole on the same axis, and the quill receiving portion fixing means. In the case where the quill receiving part advancing / retracting moving means for moving the receiving part forward and backward between the position inside the cylinder bore and the position removed from it is provided, higher tool supporting rigidity can be obtained during cutting. The automation of valve seat hole processing is achieved.

Further, the quill receiving portion inclination arranging means supports the quill receiving portion swingably with respect to the axis of the cylinder bore, and the quill receiving portion is arranged such that the quill is aligned with the valve seat hole on the same axial line. A quill receiving portion tilting means for rocking with respect to the axis of the cylinder block, and a triaxial moving means for moving the quill receiving portion tilting means with respect to the cylinder block to arbitrary positions in orthogonal three axial directions with the axial direction of the cylinder bore as one axis. , Even when there are multiple types of cylinder head-integrated cylinder blocks with different valve grip angles and cylinder bore pitches, it is possible to process the valve seat holes of the cylinder heads of those multiple types of cylinder blocks. Automation can be easily achieved.

When the spindle is equipped with a cutting tool removably through the automatic tool changing means, the cutting tool can be easily replaced automatically. Therefore, a plurality of types of valve seat holes having different machining diameters can be used. Can be easily and automatically processed.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a valve seat hole drilling device of the present invention.

FIG. 2 is a cross-sectional view showing another embodiment of the valve seat hole drilling device of the present invention.

FIG. 3 is a plan view showing an apparatus according to another embodiment.

FIG. 4 is a cross-sectional view showing a conventional valve seat hole drilling device.

[Explanation of symbols]

 5 Cylinder head integrated cylinder block 5a Cylinder bore 5b Valve seat hole 7,22 Quill receiving part 7a Tip part 8 Gear head body 10 Quill 11 Cutting tool 12 Spindle 13 Quill advancing / retracting drive cylinder 16 Quill rotary drive motor 20 Spindle rotary drive motor 21 Fixed jig Tool 23 Tilt mechanism 26 Triaxial movement mechanism 30 ATC holder

Claims (4)

[Claims] 1. A gearhead main body (8) having a quill receiving portion (7) for rotatably and movably supporting a quill (10), and a quill receiving portion for cutting a cylinder head-integrated cylinder block (5). A quill receiving portion inclination arranging means (9) arranged in the cylinder bore (5a) of the cylinder block so that the quill is aligned with the valve seat hole (5b) to be processed, and the quill, A spindle (12), which is rotatably supported on an eccentric axis with respect to the quill and equipped with a cutting tool (11) at its tip, and which is provided on the gear head main body and which moves the quill in the axial direction of the quill. A quill advancing / retreating drive means (13) for moving the quill forward and backward with respect to the receiving portion; and a quill provided on the gear head main body for rotating the quill with respect to the quill receiving portion. Rotation drive means (16)
And a spindle rotation driving means (20) provided on the gear head body for rotating the spindle with respect to the quill.
And a valve seat hole drilling device. 2. The quill receiving part tilt arranging means positions the quill receiving part inserted in the cylinder bore (5a) such that the quill is aligned on the same axis as the valve seat hole (5b). A quill receiving portion fixing means (9) for fixing the quill receiving portion in a state, and a quill receiving portion advancing / retracting moving means for advancing / retreating the quill receiving portion between a position inside the cylinder bore and a position removed from the quill receiving portion. The valve seat hole drilling device according to claim 1, which is characterized in that: 3. The quill receiving portion inclined arranging means swingably supports the quill receiving portion with respect to an axis of the cylinder bore (5a), and the quill has the same axis as the valve seat hole (5b). A quill receiving portion tilting means (23) for oscillating with respect to the axis of the cylinder bore so as to be aligned on a line, and the quill receiving portion tilting means with respect to the cylinder block, with the axial direction of the cylinder bore as one axis. Three-axis moving means (26) for moving to any position in the orthogonal three-axis directions
The valve seat hole drilling device according to claim 1, further comprising: 4. The spindle (12) according to any one of claims 1 to 3, wherein the cutting tool (11) is detachably mounted via an automatic tool changing means (30). The described valve seat hole drilling device.