JP2672745B2 - Hole processing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hole drilling device for carrying out hole drilling such as honing and boring in a hole of a work such as a cylinder sleeve of an automobile.

[0002]

2. Description of the Related Art Conventionally, the following is known as a hole drilling apparatus of this type. This hole drilling device includes a spindle shaft whose outer peripheral portion is rotatably supported by a housing, and a machining head which is concentrically connected to the tip end of the spindle shaft and has a hole drilling tool arranged on its outer peripheral portion. I have it.

Inside the spindle shaft, a first coolant liquid flow passage is formed, one end of which is open at the tip end surface, and a coolant liquid for drilling holes is externally supplied to this first coolant liquid flow passage. It is like this. On the other hand, inside the processing head, a second coolant liquid flow passage extending from the front end portion toward the rear end portion is formed, and a rear end portion thereof communicates with the first coolant liquid flow passage. From this second coolant liquid flow passage, a coolant liquid ejection passage is led out toward the outer peripheral portion of the machining head, and the ejection passage is open to the outer peripheral portion of the machining head. Therefore, at the time of drilling, when the coolant liquid is supplied to the first coolant liquid flow passage, this coolant liquid flows into the coolant liquid jet passage through the second coolant liquid passage passage, and eventually the outer periphery of the machining head from the coolant liquid jet passage. Is jetted to the part, whereby the coolant liquid is supplied to the hole drilling tool.

By the way, in recent years, the material of a cylinder sleeve of an automobile has been changed to a more wear-resistant preform (aluminum alloy containing carbon fiber and alumina). Therefore, for example, when performing boring and honing on such a wear-resistant work, if the supply amount of the coolant liquid to the tool is small, the machinability and the grindability are likely to deteriorate. Further, tool wear is likely to occur, which in turn leads to a reduction in machining efficiency and machining accuracy. Therefore, when drilling a workpiece of this type, it is necessary to supply a large amount of coolant to each tool to maintain machinability and the like. In this case, in the hole drilling apparatus as described above, it is considered that the number of the first coolant liquid flow passages and the number of the second coolant liquid flow passages are increased to supply a large amount of the coolant liquid to the hole drilling tool.

However, when the number of the first coolant liquid flow passages and the second coolant liquid flow passages formed inside the spindle shaft or the machining head is increased as described above, the rigidity of the spindle shaft and the machining head decreases, and There is a problem that it becomes impossible to perform hole machining such as boring and honing with high precision.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in order to eliminate such inconvenience, and it is possible to supply a large amount of coolant liquid to a hole drilling tool and prevent the rigidity of the spindle shaft and the machining head from being lowered. It is an object of the present invention to provide a hole drilling device that enables high-precision hole drilling.

[0007]

In order to achieve such an object, the present invention is connected to a spindle shaft rotatably supported in a housing and a tip end portion of the spindle shaft protruding from the housing. A hole drilling apparatus having a drilling head having a hole drilling tool disposed on the outer periphery thereof, in which a coolant is rotatably enclosed on the outer peripheral surface of the tip end portion of the spindle shaft and externally inserted on the tip end portion. A liquid supply plate, an annular groove formed on an inner peripheral surface of the coolant liquid supply plate, and an inside of the coolant liquid supply plate, one end of which communicates with the annular groove and the other end of which is a coolant liquid supply means. A coolant inflow path connected to the spindle shaft, a suction groove formed in communication with the annular groove on the outer peripheral surface of the tip end portion of the spindle shaft, and extending along the rotation direction of the spindle shaft, and a rotation of the spindle shaft. The first coolant liquid flow passage which is led out from the rear end of the suction groove and extends through the inside of the spindle shaft to the inside of the rear end of the machining head, and the first coolant liquid passage inside the machining head. A plurality of second coolant liquid flow passages branched from one coolant liquid flow passage and extending from the rear end portion to the front end portion inside the processing head, and from each second coolant liquid flow passage to the outer peripheral portion of the processing head. It is headed derived, and a plurality of coolant fluid jetting passage that opens to the outer peripheral portion, the suction groove及
And a plurality of the first coolant flow paths are formed.
A different number from each first coolant flow passage.
The second coolant flow passage of the
Increase the length of the suction groove in descending order of the number of runt liquid flow passages.
It is characterized by having done.

Further, according to the present invention, in the inside of the coolant liquid supply plate, an outer peripheral surface of a tip end portion of the spindle shaft and an inner peripheral surface of the coolant liquid supply plate are provided at one end on both sides in the axial direction of the annular groove. It is characterized in that an air supply passage is formed which is opened in the gap between the two and the other end of which is connected to the compressed air supply means.

[0009]

[0010]

When the coolant liquid is supplied from the coolant liquid supply means to the coolant liquid inflow passage during drilling, this coolant liquid flows into the annular groove through the coolant liquid inflow passage. At this time, a suction groove communicating with the annular groove extends along the rotation direction of the spindle shaft on the outer peripheral surface of the tip end portion of the spindle shaft, and the first coolant flows from the rear end of the suction groove in the rotation direction of the spindle shaft. A liquid flow passage is led out. Therefore, a large amount of coolant is supplied from the annular groove into the first coolant flow passage. The coolant liquid supplied into the first coolant liquid flow passage reaches the inside of the rear end portion of the processing head through the inside of the spindle shaft, and thereafter, a plurality of coolant liquids branched from the first coolant liquid flow passage inside the processing head. It flows into the second coolant flow passage. The coolant liquid flowing into each of the second coolant liquid flow passages flows in the second coolant liquid flow passage toward the tip side of the machining head to reach the coolant liquid ejection passage,
Eventually, the coolant is ejected from the ejection passage to the outer peripheral portion of the machining head. As a result, a large amount of coolant is supplied to the hole drilling tool. At this time, the suction groove and the first coolant liquid
A plurality of flow passages are formed and each first coolant flow
Different number of second coolant flow passages from each passage
The second coolant flow path,
Since the length of the inlet groove is increased, each first coolant flow passage
A considerable amount of coolant corresponding to the number of second coolant flow passages.
A runt liquid can be supplied.

Further, in this case, in the inside of the coolant liquid supply plate, at one end on both sides in the axial direction of the annular groove, a gap is formed between the outer peripheral surface of the tip end portion of the spindle shaft and the inner peripheral surface of the coolant liquid supply plate. By forming an air supply path that is opened and the other end is connected to the compressed air supply means, and by supplying compressed air from the other end of this air supply path, the coolant liquid that has flowed into the annular groove is the tip of the spindle shaft. It is possible to prevent leakage from the gap between the outer peripheral surface and the inner peripheral surface of the coolant liquid supply plate.

[0012]

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. In the present embodiment, as the hole machining device, a combined machining device H that performs the boring process and the honing process on the hole X of the work W is taken as an example. 1 is a sectional view of a main part of a combined machining apparatus H which is an example of the embodiment of the present invention, FIG. 2 is a sectional view taken along the line II-II of FIG. 1, FIG. 3 is a sectional view taken along the line III-III of FIG. 1, and FIG. 3 is a sectional view taken along line IV-IV of FIG. 3, FIG. 5 is a sectional view taken along line VV of FIG. 1, FIG. 6 is a sectional view taken along line VI-VI of FIG. 1, and FIG. 7 is a sectional view taken along line VII-VII of FIG. .

The combined machining apparatus H comprises a housing 1, a first spindle shaft 7, a second spindle shaft 12, a machining head 21, and a coolant liquid supply disc 51.

The housing 1 is formed in a cylindrical shape, and flange portions 4 are formed at the upper and lower ends thereof. A plurality of guide rods 5 that are movable along the axial direction are inserted through these flange portions 4 at predetermined intervals in the circumferential direction. In the arranged state, the guide rod 5 is biased upward by a spring (not shown). A through hole 6 is formed at the tip of the guide rod 5 so as to penetrate in the radial direction. The housing 1 configured as described above is provided on a frame 3 via a slide base 2 as shown in FIG. The slide base 2 can be moved in the vertical direction by a cylinder (not shown). Therefore, as the slide base 2 moves up and down, the housing 1 also moves up and down in the axial direction.

The first spindle shaft 7 is formed in a long cylindrical shape, and as shown in FIG. 1, is formed on a small diameter portion 8 which is long in the vertical direction and a lower end portion of the small diameter portion 8. It has a large diameter portion 9. The inner peripheral surface of the large-diameter portion 9 is formed in a tapered shape whose diameter increases downward. In the first spindle shaft 7 thus configured, the small diameter portion 8 is inserted into the housing 1 in a state where the large diameter portion 9 is projected downward from the housing 1, and the housing 10 is inserted through the bearings 10, 11 and the like. It is rotatably supported in 1. In the supported state, the first spindle shaft 7 is movable integrally with the housing 1 in the axial direction thereof in the vertical direction.

The second spindle shaft 12 is formed in a long cylindrical shape and has a small diameter portion 13 which is long in the vertical direction as shown in FIG. A taper portion 14 is formed at the lower end of the small diameter portion 13 so as to expand downward. The outer peripheral surface of the tapered portion 14 has a shape corresponding to the inner peripheral surface of the large diameter portion 9 of the first spindle shaft 7.

A large diameter portion 15 is formed at the lower end of the tapered portion 14. As shown in FIGS. 1 and 2, the lower end surface of the large-diameter portion 15 has first coolant liquid passages 16a ₁ , 16a.
b ₁ and 16 c ₁ are open at a predetermined interval in the circumferential direction.
These first coolant liquid flow passages 16a ₁ , 16b ₁ , 16
The other end of c ₁ passes through the inside of the large-diameter portion 15 and the large-diameter portion 1 respectively.
The outer peripheral surface of 5 is opened at a predetermined interval in the circumferential direction with its axis inclined in the rotation direction of the second spindle shaft 12 (the direction of the arrow in FIG. 2).

On the outer peripheral surface of the large-diameter portion 15, as shown in FIG. 2, one end of each of the first coolant liquid flow passages 16a ₁ , 16b ₁ ,
A suction groove 17a, which communicates with each opening edge on the other end side of 16c ₁ , and has each other end extending along the rotation direction of the second spindle shaft 12;
17b and 17c are formed respectively. The lengths of these suction grooves 17a, 17b, 17c are
It becomes long in order of 17b and 17a. That is, the suction groove 17a is the longest and the suction groove 17c is the shortest. Further, inclined surfaces 18 are formed at the portions where the suction grooves 17a, 17b, 17c and the respective opening edges on the other end side of the first coolant liquid flow passages 16a ₁ , 16b ₁ , 16c ₁ intersect. 1 and 7, reference numerals 19a, 1
9b is a labyrinth groove.

A flange portion F is formed at the upper end of the large diameter portion 15. The outer diameter of this flange F is the first
The outer diameter of the large diameter portion 9 of the spindle shaft 7 is substantially the same.

The second spindle shaft 1 thus constructed
2 is inserted in the first spindle shaft 7 with its axis aligned with the axis of the first spindle shaft 7. In the arranged state, the second spindle shaft 12
Outer peripheral surface of the small diameter portion 13 and the small diameter portion 8 of the first spindle shaft 7.
The inner peripheral surface of the above is spline-coupled (not shown), whereby the second spindle shaft 12 and the first spindle shaft 7 can rotate integrally.

The small diameter portion 13 of the second spindle shaft 12
A metal bush 20 is arranged between the outer peripheral surface of the first spindle shaft 7 and the inner peripheral surface of the small diameter portion 8 of the first spindle shaft 7, whereby the second spindle shaft 12 moves vertically with respect to the first spindle shaft 7. It can slide in any direction. An oscillation mechanism (not shown) is connected to the upper end of the second spindle shaft 12, and the second spindle shaft 12 is moved to the first spindle shaft 12 by operating the oscillation mechanism.
It slides up and down with respect to the spindle shaft.

As shown in FIG. 1, the processing head 21 includes a head main body 22, a driven pulley 24 formed on the upper end of the head main body 22, and a pulley belt 23 wound around the outer peripheral portion of the head main body 22, and the driven pulley 24. The pulley 24 has a tapered portion 25 formed on the upper end thereof.

The head main body 22 is formed in a cylindrical shape, and a boring wheel 26 having hard particles (not shown) such as diamond adhered to the outer peripheral surface is fitted to the lower end of the head main body 22. Fixed together (see Fig. 4). As shown in FIGS. 3 and 4, on the outer peripheral portion of the head body 22 above the boring wheel 26, groove portions 27 extending along the axis are formed at six positions in the circumferential direction at equal intervals.
A through hole 28 and a through hole 29a penetrating to the inside of the head main body 22 are formed in the central portion and the upper and lower edge portions of the bottom surface of the groove portion 27.
29b are respectively formed. As shown in FIGS. 3 and 4, the groove portion 27 and the through holes 28, 29a, and 29b are used for rough honing stone heads 30 (hereinafter, simply referred to as “rough stone heads”) and finishing honing stones. Three grindstones 31 (hereinafter, simply referred to as "finishing grindstones") are alternately inserted in the circumferential direction.

More specifically, as shown in FIG. 4, the rough grinding stone head 30 and the finishing grinding stone head 31 both extend vertically in the vertical direction, and extend vertically from the upper and lower ends of the vertical body 32, respectively. It is formed in a U-shape by the protruding leg portions 33a and 33b, and the roughing grindstone 34 is attached to the outer surface of the body portion 32 of the roughing grindstone base 30, and the body portion 32 of the finishing grindstone base 31 is attached.
A finishing whetstone 35 is adhered to the outer surface of the. In addition, the leg portions 33a, 3 of the rough grinding stone head 30 and the finishing grinding stone head 31, respectively.
An inclined surface 36 is formed at the tip of 3b.

The roughing grindstone base 30 and the finishing grindstone base 31 thus configured each have a body portion 32 and leg portions 33a, 33.
b is inserted into the groove 27 and the through holes 29a and 29b so as to be movable in the radial direction. In the fitted state, the inclined surfaces 36 of the leg portions 33a and 33b project inside the head body 22. These inclined surfaces 36
The inclined surfaces 39 of the rough grinding stone drive shaft 37 and the finishing grinding stone drive shaft 38, which are inserted and arranged inside the head body 22, are in contact with each other.

The roughing grindstone drive shaft 37 and the finishing grindstone drive shaft 38 are piston cylinder mechanisms (not shown) connected to the upper ends of the roughening grindstone drive shaft 37 and the finishing grindstone drive shaft via rods R1 and R2, as shown in FIG. It is possible to independently move its axial direction up and down. Therefore, the rough grinding wheel drive shaft 3
When 7 (or the finishing grindstone drive shaft 38) moves upward from the abutting state described above, the rough grinding stone head 30 (or the finishing grinding stone head 31) is radially outward due to the cam action of the inclined surfaces 36 and 39. And the roughing grindstone 34 attached to the body 32
(Or the finishing grindstone 35) projects from the outer peripheral portion of the head body 23.

On the other hand, when the rough grindstone drive shaft 37 (or the finish grindstone drive shaft 38) moves from the upper side to the lower side, the rough grindstone base 30 (or the finish grindstone base) is caused by the cam action of the inclined surfaces 36 and 39. 31) moves inward in the radial direction, and the roughing grindstone 34 (or the finishing grindstone base 35) attached to the body portion 32 is recessed inward from the outer peripheral surface of the head body 23.

The reference numeral 40 in FIGS. 3 and 4 indicates
It is a connecting member for connecting the rough grinding wheel head 30 (finishing wheel head 31) and the rough grinding wheel drive shaft 37 (finishing wheel drive shaft 38). The connecting member 40 has one end connected to the center of each body 32 of the rough grinding wheel base 30 (finishing wheel base 31) via a bolt 41, and the other end penetrating through the through hole 28 for roughing. It is slidably fitted into an inclined groove 42 formed on a grinding wheel drive shaft 37 (finishing wheel drive shaft 38). This inclined groove 4
Numeral 2 extends so as to correspond to the inclination angles of the inclined surfaces 36 and 39. Therefore, the connecting member 40 is interlocked with the radial movement of the rough grindstone base 30 (finishing grindstone base 31). ing.

Further, as shown in FIGS. 1 and 5, in the wall portion 22a of the head main body 22, each rear end portion is driven pulley 2.
First coolant liquid flow passages 16a ₂ , 16b ₂ and 16c ₂ are formed on the upper end surface of No. 4 at a predetermined interval in the circumferential direction, and each tip portion extends in the wall portion 22a toward the tip side. These first coolant liquid flow passages 16a ₂ , 16b ₂ ,
From the tip of 16c ₂ , the second coolant flow passage 43a,
43b and 43c are extended in the wall part 22a toward the front end side. Second coolant flow passages 43a, 43b, 43
On the inner peripheral surface of c, one end of each of the first coolant liquid ejection passages 44a has a plurality of openings, and the other ends of each of the first coolant liquid ejection passages 44a extend outward in the radial direction and the head body 22
Has an opening at the outer peripheral portion of.

From the inner peripheral surface of the rear end portion of the second coolant liquid flow passage 43a, as shown in FIG.
The inside of 2a extends in a direction orthogonal to the axial direction. As shown in FIGS. 1 and 5, the rear end portions of the second coolant liquid flow passages 46 and 47 are opened on the inner peripheral surface of the tip end of the communication passage 45 so as to be separated from each other in the axial direction of the communication passage 45. Cage,
The respective tip portions of the second coolant liquid flow passages 46, 47 are the wall portions 2.
It extends in 2a toward the tip side. As a result, the first coolant flow passage 1 is formed inside the processing head 21.
The second coolant passage 43a from 6a _2, 46, 47 are branches.

The second coolant flow passages 46, 47
As shown in FIGS. 1 and 6, each of the inner peripheral surfaces of the second coolant liquid jetting passage 44b has a plurality of openings at one end, and the other end of the second coolant liquid jetting passage 44b is radially outside. It extends toward the outside and opens to the outer peripheral portion of the head body 22.

A communication passage 49 extends from the inner peripheral surface of the rear end portion of the second coolant flow passage 43b in the wall portion 22a in the direction orthogonal to the axial direction. A rear end portion of the second coolant liquid flow passage 50 is opened at the inner peripheral surface of the front end portion of the communication passage 49, and the front end portion of the second coolant liquid flow passage 50 has a wall portion 22.
It extends in a toward the tip side. As a result, inside the processing head 21, the first coolant flow passage 16
from b ₂ a second coolant passage 43 b, 50 are branches.

A plurality of one ends of the second coolant liquid ejection passages 44b are opened on the inner peripheral surface of the second coolant liquid passage 50, and the other ends of the second coolant liquid ejection passages 44b are arranged in the radial direction. It extends outward and opens at the outer peripheral portion of the head body 22.

The second coolant flow passages 43a, 43b, 43c, 4647, and 50 thus constructed are shown in FIG.
And, as shown in FIG. 6, they are arranged at substantially equal intervals in the circumferential direction.

The processing head 21 thus constructed is
As shown in FIG. 1, the taper portion 25 has the second spindle shaft 1
The second spindle shaft 12 is connected to the lower end portion of the second spindle shaft 12 via a bolt or the like in a state of being fitted to the tapered surface 12a formed on the inner peripheral surface of the tip end portion of the second spindle shaft 12. In the connected state, the rear end portions of the first coolant liquid flow passages 16a ₂ , 16b ₂ and 16c _{2 have} first coolant liquid flow passages 16a ₁ , 16b ₁ and 16c formed in the second spindle shaft 12. It is designed to communicate with each _one .

As shown in FIG. 1, the coolant liquid supply plate 51 has a bottom portion 52, a cylindrical body portion 53 extending upward from the bottom portion 52, and a flange formed on the upper end portion of the body portion 53. And a section 54.

The bottom portion 52 has a main body 55 and a tubular member 56. The main body 55 is formed in a disc shape,
As shown in FIGS. 1 and 7, a taper protrusion 57 is formed in the central portion of the upper end surface of the taper so as to expand in diameter upward. As shown in FIGS. 2 and 7, a through hole 58 penetrating to the lower end surface is formed in the central portion of the upper end surface of the tapered protrusion 57. The diameter of the through hole 58 is slightly larger than the outer diameter of the large diameter portion 15 of the second spindle shaft 12. An annular groove 59 is formed on the inner peripheral surface of the through hole 58. The widthwise dimension of the annular groove 59 is the same as that of the suction grooves 17a, 17b, 17c of the second spindle shaft 12. Labyrinth grooves 60a, 60 are provided on the inner peripheral surface of the through hole 58 on both sides in the axial direction of the annular groove 59.
b and 60c are formed.

Inside the main body 55, as shown in FIGS.
As shown in, the air supply passage 55a is 180 ° in the circumferential direction.
They are formed separately from each other. Air supply path 55a
Has one end open in the vicinity of the labyrinth groove 60a and the taper protrusion 57, and the other end merges inside to extend radially outward and open to the outer peripheral portion of the main body 55. A compressed air supply device (not shown) is connected to the opening on the other end side of the air supply passage 55a via a compressed air supply tube 61 and the like.

The tubular member 56 is formed in a bottomed cylindrical shape, and its inner diameter is larger than the outer diameter of the tapered protrusion 57. Further, a through hole 62 having the same diameter as the through hole 58 is formed at the center of the bottom of the tubular member 56. The tubular member 56 configured in this manner has its axis extending along the taper projection 5
7 and the bottom surface of the taper protruding portion 57 so as to face the upper end surface. In the arranged state, an annular space K is formed between the inner peripheral surface of the tubular member 56 and the outer peripheral surface of the tapered protrusion 57, and the annular space K is opened near the tapered protrusion 57. Communicating with the air supply passage 55a. Also,
A gap 63 is formed between the bottom surface of the tubular member 56 and the upper end surface of the taper protrusion 57, and the annular space K and the through hole 58 communicate with each other through the gap 63.

Further, a coolant liquid inflow passage 64 is formed in the coolant liquid supply plate 51 at 180 ° apart in the circumferential direction. The coolant liquid inflow passage 64 has one end opening to the inner peripheral surface of the annular groove 59, and the other end passing through the bottom portion 49 and the body portion 50 to the outer peripheral portion of the flange portion 54. In addition, as shown in FIG. 1, a flexible tube 65 is provided at the opening on the other end side of the coolant liquid inflow path 64.
A coolant liquid supply device (not shown) is connected via such means.

In the coolant liquid supply plate 51 thus constructed, the through hole 58 of the bottom portion 52, the annular groove 59 and the labyrinth grooves 60a, 60b and the suction grooves 17a, 17b, 17c of the second spindle shaft 12 and the labyrinth are provided. Groove 19a,
The second spindle shaft 1 in the state of communicating with 19b respectively.
It is extrapolated to the large-diameter portion 15 of No. 2 (see FIGS. 1 and 7). As a result, the coolant liquid inflow passage 64 is formed in the annular groove 5
Through the first coolant flow passages 16a ₁ , 16b ₁ , 1
6c ₁ and the outer peripheral surface of the large diameter portion 15 and the inner peripheral surface of the through hole 58 are sealed.

In the externally inserted state, as described above, since the hole diameter of the through hole 58 is slightly larger than the outer diameter of the large diameter portion 15, the large diameter portion of the second spindle shaft 12 is The outer peripheral surface of 15 rotates without contacting the inner peripheral surface of the through hole 58. This prevents heat generation due to friction between the through hole 58 and the large diameter portion 15 when the second spindle shaft 12 rotates.

As shown in FIG. 1, the tip of the guide rod 5 is connected to the flange 54 through a nut N or the like with the through hole 6 communicating with the coolant liquid inflow path 64. There is. In the coupled state, the coolant liquid supply plate 51 has the guide rod 5 with the flange portion F of the second spindle shaft 12 in contact with the upper end surface of the bottom portion 52.
Is urged upward by the spring, and thereby the coolant liquid supply plate 51 is supported by the housing 1 so that the coolant liquid supply plate 51 can move toward and away from the housing 1 as the second spindle shaft 13 moves in the vertical direction.

In order to perform boring and honing in the hole X of the work W by using the combined machining apparatus H having the above structure,
First, the slide base 2 is moved downward so that the processing head 21 approaches the hole X. At this time, the processing head 21
Moves integrally with the housing 1, the first and second spindle shafts 7 and 12 and the coolant liquid supply plate 51, and also rotates integrally with the first and second spindle shafts 7 and 12. Therefore, by moving the processing head 21 further downward and inserting it into the hole X, the hole X formed by the boring wheel 26 arranged in the head body 22.
Boring is performed.

After the boring process is completed, honing process is performed. To perform honing, first, the slide base 2 is moved upward by the stroke of honing, and the machining head 21 is set at the honing position. At this time, the processing head 21 rotates integrally with the first and second spindle shafts 7 and 12. Next, the roughing grindstone drive shaft 37 is moved upward so that the roughening grindstone 34 is projected outward from the outer peripheral portion of the head body 22. Next, the oscillation mechanism is operated to reciprocate the second spindle shaft 12 in the vertical direction with respect to the first spindle shaft 7.
As a result, the processing head 21 reciprocates in the vertical direction, and rough honing of the hole X by the roughing grindstone 34 is performed.

Next, the roughing grindstone drive shaft 37 is moved downward so that the roughening grindstone 34 is recessed inward from the outer peripheral portion of the head body 22. At this time, the processing head 21 is set to the honing processing position described above. Next, the finishing grindstone drive shaft 38 is moved upward so that the finishing grindstone 35 is projected outward from the outer peripheral portion of the head body 22.

After that, as in the case of rough honing, the machining head 21 is reciprocally moved in the vertical direction, so that the finishing honing of the hole X is performed by the finishing grindstone.

By the way, during the boring process and the honing process, the first and second coolant liquid ejection passages 4 are formed.
A coolant liquid is supplied from the holes 4a and 44b to the boring wheel 26, the roughing grindstone 34, and the finishing grindstone 35.

That is, during the boring process and the honing process, the coolant liquid is supplied from the coolant liquid supply device to the opening on the other end side of the coolant liquid inflow path 64. When the coolant liquid is supplied to the coolant liquid inflow passage 64, the coolant liquid flows into the coolant liquid inflow passage 6
It flows into the annular groove 59 through 4 and reaches the first coolant liquid flow passages 16a ₁ , 16b ₁ , 16c ₁ . The coolant liquid flowing into the first coolant liquid flow passages 16a ₁ , 16b ₁ and 16c ₁ flows into the first coolant liquid flow passages 16a ₂ , 16b ₂ and 16c ₂ through the second spindle shaft 12, respectively.

At this time, the first coolant liquid passage 16a ₂
The coolant liquid flowing into (16b ₂ ) flows toward the tip side through the second coolant liquid flow passages 43a, 46, 47 (43b, 50) branched from the first coolant liquid flow passage 16a ₂ (16b ₂ ). First and second coolant liquid ejection passages 4
4a, 44b, and eventually the head main body 22 from the openings on the other end side of the first and second coolant liquid ejection passages 44a, 44b.
Gush out to the outer circumference.

On the other hand, the coolant liquid flowing into the first coolant liquid flow passage 16c ₂ is transferred to the second coolant liquid flow passage 43.
It flows through the inside of c toward the front end side and reaches the first coolant liquid ejection passage 44a, and eventually ejects from the other end side opening of the first coolant liquid ejection passage 44a to the outer peripheral portion of the head main body 22. As a result, the coolant liquid is supplied to the boring wheel 26, the roughing grindstone 34, and the finishing grindstone 35.

When supplying the coolant liquid, it is necessary to jet a substantially uniform amount of the coolant liquid to the outer peripheral portion of the head main body 22, which is the first coolant liquid flow passages 16a ₂ , 16b ₂ and 16c _2. This is done by associating the number of the second coolant liquid passages branched from the with the lengths of the suction grooves 17a, 17b, 17c.

That is, as described above, on the outer peripheral surface of the tip end portion of the second spindle shaft 12, each one end is connected to each opening edge on the other end side of the first coolant liquid flow passages 16a ₁ , 16b ₁ , 16c ₁ , respectively. Suction grooves 17a, 17b, 17c, which communicate with each other and extend in the rotational direction of the second spindle shaft 12, are formed so as to communicate with the annular groove 59. These suction grooves 17a, 17b, 17c are formed. Has a longer length in the order of the suction grooves 17c, 17b, 17a. Therefore, the amount of the coolant liquid flowing into the first coolant liquid flow passages 16a ₁ , 16b ₁ , 16c ₁ is equal to that of the first coolant liquid flow passage 1
6c ₁ , 16b ₁ and 16a ₂ increase in this order. In other words, the amount of the coolant liquid flowing into the first coolant liquid flow passage 16a ₂ is the largest, and the amount of the coolant liquid flowing into the first coolant liquid flow passage 16c ₂ is the smallest.

As a result, the second coolant flow passage 43 is formed.
a first coolant flow passage 16 where a, 46, 47 branch
It is possible to supply a considerable amount of the coolant liquid corresponding to the number of the second coolant liquid flow passages to the first coolant liquid 16b _{2 at} which the a ₂ and the second coolant liquid flow passages 43b and 50 branch. A substantially uniform amount of the coolant liquid can be jetted onto the outer peripheral portion of the main body 22.

Further, when the coolant liquid is supplied, the compressed air is supplied from the compressed air supply device to the air supply passage 55a. The compressed air supplied to the air supply passage 55a is supplied to the labyrinth groove 60a through the air supply passage 55a, and is also supplied into the through hole 58 through the annular space K and the gap 63. Thereby, the labyrinth groove 60
It is possible to prevent the coolant liquid from leaking from a and 60c.

In the combined machining apparatus having the above structure, the first coolant flow passage 16 is provided inside the machining head 21.
a ₂ (16b ₂ ) to a plurality of second coolant liquid flow passages 43
a, 46, 47 (43b, 50) are branched. Therefore, the amount of the coolant liquid supplied to the outer peripheral portion of the head main body 22 can be increased by the amount of the coolant liquid flowing through the second coolant liquid flow passages 46, 47 (50). Therefore, when supplying a large amount of the coolant liquid to the outer peripheral portion of the head body 22, it is not necessary to increase the number of the first coolant liquid passages as in the conventional case, and the second coolant liquid passages are provided in the machining head 21. It only needs to be formed in the part excluding the rear end. As a result, it is possible to prevent the rigidity of the machining head 21 and the second spindle shaft 12 from being lowered, and even when using a workpiece having abrasion resistance,
High precision boring and honing can be performed.

Further, on the outer peripheral surface of the lower end portion of the second spindle shaft 12, one end is provided with the first coolant liquid flow passages 16a ₁ , 16b ₁ ,
Suction groove 17a, 17b, 17c communicating with the other end of 16c ₁ and extending along the rotation direction of the second spindle shaft 12 at the other end.
Are formed so as to communicate with the annular groove 59, the first coolant liquid flow passages 16a ₁ (16a ₂ ), 16b ₁ (16
b ₂ ), 16c ₁ (16c ₂ ) can be supplied with a large amount of coolant, and suction grooves 17a, 17b, 17
By increasing the length of c in the order of the suction grooves 17c, 17b, 17a, the second coolant liquid flow passages 43a, 46,
First coolant liquid flow passage 16a ₂ and second branch 47
A considerable amount of the coolant liquid corresponding to the number of the second coolant liquid flow passages can be supplied to the first coolant liquid 16b ₂ where the coolant liquid flow passages 43b and 50 are branched, and the outer periphery of the head body 22 is substantially uniform. A large amount of coolant can be ejected.

Furthermore, when supplying the coolant,
The compressed air supplied to the air supply path 55a is the air supply path 5
It is possible to prevent the coolant liquid from leaking from the labyrinth grooves 60a and 60c by being supplied to the labyrinth groove 60a through the inside of 5a and being supplied into the through hole 58 through the annular space K and the gap 63. .

Further, since the first coolant flow passages 16a ₁ , 16b ₁ , 16c ₁ are formed only at the tip of the second spindle shaft 12, it is possible to prevent the rigidity of the second spindle shaft 12 from being lowered. You can

[0061]

As is apparent from the above description, according to the combined machining apparatus of the present invention, the coolant liquid supply is rotatably enclosed on the outer peripheral surface of the tip end portion of the spindle shaft and externally inserted on the tip end portion. A plate, an annular groove formed on the inner peripheral surface of the coolant liquid supply plate, and an inside of the coolant liquid supply plate, one end of which communicates with the annular groove and the other end of which is connected to the coolant liquid supply means. A coolant inflow passage, a suction groove that is formed in communication with the annular groove on the outer peripheral surface of the tip end of the spindle shaft, and extends along the rotation direction of the spindle shaft, and a rear end of the suction groove in the rotation direction of the spindle shaft. And a first coolant liquid flow passage formed through the inside of the spindle shaft to the inside of the rear end portion of the machining head, and a branch from the first coolant liquid flow passage inside the machining head, A plurality of second coolant liquid flow passages extending from the rear end portion toward the front end portion, and a plurality of coolant liquid jets that are led out from each second coolant liquid flow passage toward the outer peripheral portion of the machining head and open to the outer peripheral portion. It has a road. Therefore, when a large amount of coolant is supplied to the outer peripheral portion of the machining head, it is not necessary to increase the number of the first coolant fluid passages as in the conventional case, and the second coolant fluid passages are provided behind the machining head. It suffices if it is formed in the part excluding the end. As a result, it is possible to prevent the rigidity of the machining head and the spindle shaft from being lowered, and it is possible to perform highly accurate hole machining even when a workpiece having wear resistance is used. In addition, the suction groove and the first cooler
A plurality of liquid flow passages are formed and each first cooling
A different number of second coolant liquid from the liquid flow passage
The flow passages are branched so that the number of the second coolant liquid flow passages is large.
The length of the suction groove was increased in the order of
Corresponding to the number of second coolant liquid flow passages in the liquid flow passages
Amount of coolant can be supplied,
It is possible to eject a substantially uniform amount of coolant liquid on the outer periphery.
Wear.

Further, in this case, inside the coolant liquid supply plate, at one end on both sides in the axial direction of the annular groove, a gap is formed between the outer peripheral surface of the tip end portion of the spindle shaft and the inner peripheral surface of the coolant liquid supply plate. By forming an air supply path that is opened and the other end is connected to the compressed air supply means, and the compressed air is supplied from the other end side of this air supply path, the coolant liquid that has flowed into the annular groove is the tip of the spindle shaft. It is possible to prevent leakage from the gap between the outer peripheral surface of the portion and the inner peripheral surface of the coolant liquid supply plate.

[0063]

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of essential parts of a combined machining apparatus that is an example of an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a sectional view taken along line IV-IV of FIG. 2;

FIG. 5 is a sectional view taken along line VV of FIG. 1;

6 is a sectional view taken along line VI-VI of FIG.

FIG. 7 is a sectional view taken along line VII-VII of FIG. 2;

[Explanation of symbols]

H ... Combined processing device (hole processing device), 1 ... Housing, 1
_{6a 1 ~16c 1, 16a 2 ~16c} 2 ... first coolant passage, 12 ... second spindle axis (spindle shaft), 26 ...
Wheel for boring (hole drilling tool), 30 ... Grinding wheel head for rough honing (hole drilling tool), 31 ... Grinding wheel head for finishing honing (hole drilling tool), 43a, 43b, 4
3c, 46, 47, 50 ... Second coolant liquid flow passage, 4
4a, 44b ... Coolant liquid ejection passage, 21 ... Processing head, 59 ... Annular groove, 64 ... Coolant liquid inflow passage, 51 ...
Coolant liquid supply plate, 17a, 17b, 17c ... Suction groove, K ... Air supply passage

Claims (2)

(57) [Claims] 1. A spindle shaft rotatably supported in a housing, and a machining head connected to a tip end portion of the spindle shaft projecting from the housing and having a hole machining tool arranged on an outer peripheral portion thereof. In a hole drilling device including: a coolant liquid supply plate rotatably encapsulating an outer peripheral surface of a tip end portion of the spindle shaft and externally inserted to the tip end portion; and an inner peripheral surface of the coolant liquid supply plate. An annular groove formed in the coolant liquid supply plate, one end of which communicates with the annular groove and the other end of which is connected to a coolant liquid supply means, and a tip end portion of the spindle shaft. A suction groove formed on the outer peripheral surface in communication with the annular groove and extending along the rotation direction of the spindle shaft; and a suction groove extending from the rear end of the suction groove in the rotation direction of the spindle shaft. A first coolant liquid flow passage formed through the inside of a spindle shaft to the inside of the rear end portion of the processing head; and inside the processing head, the first coolant liquid flow passage is branched from the first coolant liquid flow passage. A plurality of second coolant liquid flow passages extending from the rear end portion to the front end portion, and a plurality of coolants which are led out from the respective second coolant liquid flow passages toward the outer peripheral portion of the machining head and open to the outer peripheral portion. Bei a liquid ejection passage
A plurality of the suction groove and the first coolant flow passage are formed.
From each first coolant flow passage
Diverging a different number of the second coolant flow passages,
In order of increasing number of the second coolant liquid flow passages,
A hole drilling device characterized by having a long length . 2. A gap between an outer peripheral surface of a tip end portion of the spindle shaft and an inner peripheral surface of the coolant liquid supply plate at one end inside the coolant liquid supply plate at positions on both sides in the axial direction of the annular groove. 2. The hole drilling device according to claim 1, wherein an air supply path is formed in which the other end is connected to the compressed air supply means.