JP3013233B2 - Boring 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 boring apparatus suitable for boring a cylinder hole of a cylinder block for a relatively large-volume large-, medium-, or small-sized engine such as an automobile engine.

[0002]

2. Description of the Related Art Normally, a variety of automobile engines having different numbers of cylinders or different cylinder hole diameters corresponding to engine output specifications are prepared to meet the needs of vehicles.

FIG. 4 shows an example of a boring apparatus for boring a cylinder hole of a cylinder block of an automobile engine having a different cylinder hole diameter as described above.
In FIG. 4, 21 is a frame of a boring machine,
Reference numeral 22 denotes a work support, on which a cylinder block 20 of an engine for boring a cylinder hole 20a is mounted and fixed. 23 is the base, 6
Is a spindle head mounted on the base 23, and a boring head 10 is mounted on the spindle head 6 so as to face the cylinder block 20, which is a processing work.

FIGS. 5 and 6 show a conventional example of the boring head 10. As shown in FIG. The boring head 10 is used for processing a cylinder block having the same cylinder hole pitch and different cylinder hole diameters. In FIGS. 5 to 6, reference numeral 6 is attached and fixed to a base 23 (see FIG. 4). The spindle head 31 is a cutter head, and 2 is a cutter attached and fixed to the outer periphery of the tip of the cutter head 31.

[0005] As described above, the boring head 10
When machining the cylinder holes 20a of the cylinder block 20 having different cylinder hole diameters by using the cutter head 31, after machining a cylinder hole of a certain cylinder hole diameter B11, loosening or tightening the mounting screw, The cutter head 31 is removed from the spindle head 6 with the cutter 2 fixed while the quick change mechanism 32 configured to easily replace the cutter head 31 is loosened. Then, the cutter head 3 set to B12 of the cylinder hole diameter to be processed next.
1 'is attached to the spindle head 6 and fixed by the quick change mechanism 32.

[0006]

In a conventional boring apparatus as shown in FIGS. 5 and 6, the cylinder block 20 is machined into cylinder holes 20a having different cylinder hole diameters as described above. At this time, a cutter head 31 or 31 'set for the outer diameter B11 or B12 of the cutter 2 corresponding to each cylinder hole diameter is prepared, and when the machining of a certain cylinder hole diameter B11 is completed, a quick change is performed. The cutter head 31 with the cutter 2 attached is removed from the spindle head 6 by loosening the mechanism 32, and the cutter head 31 'having the next cylinder hole diameter B12 is attached to the spindle head 6.

For this reason, it is necessary to prepare a cutter head 31 whose outer diameter is adjusted by assembling the cutter 2 for each cylinder hole diameter, and to adjust the outer diameter by changing the cutter head 31 unit. Requires a lot of man-hours to set up the processing. Further, since the same number of cutter heads as the cylinder hole diameter are required, the processing cost increases. Also,
Foreign substances such as chips and dust easily enter from a minute gap between the tip of the spindle head 6 and the end of the cutter head 31 opposed thereto.
Considerable man-hours are required for maintenance.

The present invention solves the above-mentioned problems, and eliminates the need for replacing a cutter head when boring a member such as a cylinder block having a different cylinder hole diameter, thereby greatly reducing the number of setup steps. The purpose is to provide.

[0009]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems in a boring apparatus, and has a gist of improving a boring head and its related members as follows.

That is, the first means is a boring apparatus for boring a hole in a workpiece to be bored by a boring head movable in an axial direction of the hole, wherein the boring head comprises: And a slider engaged with the drawbar and moved in the radial direction of the hole at a constant rate in accordance with the reciprocation thereof, and a cutter fixed to a tip end thereof. And a driving mechanism for reciprocatingly driving the draw bar is connected to the boring head. Further, in addition to the above-described means, the present invention also provides a clamp mechanism that combines the draw bar and the slider by a tightening force along the axial direction of the draw bar and integrates the hole to perform the hole processing. Is about to do.

More specifically, in the above boring apparatus, the draw bar and the slider are configured to be engaged with each other by engagement of serrations formed on both sides so as to be inclined with respect to the axial direction.

More specifically, a pair of the sliders are provided symmetrically with respect to the axis of the boring head, and are moved in radial directions opposite to each other by the reciprocating movement of the draw bar to reduce the outer diameter of the cutter. It is configured to change.

According to the above means, when the draw bar of the boring head is moved in the axial direction after the work is fixed, the pair of sliders serrated and connected to the draw bar move in the radial directions opposite to each other. The cutter fixed to the outer peripheral end of the member also moves in the radial direction. At this time, the distance between the two cutters is made to match the diameter of the processing hole by adjusting the amount of movement of the draw bar.

Therefore, by adjusting the amount of movement of the draw bar, that is, the amount of movement of the slider to which the cutter is fixed, according to the diameter of the hole to be machined, it is possible to machine holes having different inner diameters without removing the machining head unlike the conventional one. It can be carried out.

[0015] Further, a preferable means of the present invention is that an air ejection means for ejecting air is provided at an engagement portion between the draw bar and the slider.

[0016] More preferably, in the above means, the clamp mechanism moves the rod-shaped clamper fitted reciprocally to the center hole of the draw bar in the axial direction of the boring head by a clamper driving mechanism. The slider and the drawbar are configured to be brought into pressure contact with each other via a head portion at the tip of the clamper.

According to the above means, the outer diameter of the cutter attached to the outer peripheral end of the slider is adjusted by the reciprocating movement of the draw bar and the movement of the slider in the opposite direction in the radial direction according to the reciprocating movement, and then the clamp mechanism is operated. The slider and the drawbar are fixed by the tightening force. As a result, the cutter is firmly fixed to the draw bar, and rigidity sufficient to withstand heavy cutting is maintained.

Further, in addition to the above-described means, the concrete means of the present invention also includes that the boring head is provided with a cutter coolant supply passage communicating with the cutter mounting portion. In addition, the temperature of the cutter can be prevented from rising, and the chips can be easily discharged.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to FIGS.

FIG. 4 is an overall configuration diagram of a boring machine for boring a cylinder block cylinder of an automobile engine according to an embodiment of the present invention. In FIG. 4, reference numeral 21 denotes a frame, and 22 denotes a work abutment. On the work support 22, a cylinder block 20 of an engine for boring a work, ie, a cylinder hole 20a, is mounted and fixed. Reference numeral 23 denotes a base, and reference numeral 6 denotes a spindle head mounted on the base 23 so as to be able to advance and retreat to the cylinder block 20 (work). On the spindle head 6,
A boring head 10 is provided facing the cylinder block 20.

Reference numeral 11 denotes a servomotor, and 12 denotes a ball screw connected to the servomotor 1.
The ball screw 12 is rotated by the driving force 1, and a draw bar 3 described later is connected to the ball screw 12 so as to be reciprocated. Reference numeral 15 denotes a rotary hydraulic cylinder for applying a tightening force to a clamper (clamp mechanism) described later.

1 to 3 show the detailed structure of the boring head 10 according to the embodiment. 1 to 3, reference numeral 5 denotes a main body of the boring head 10, and 6 denotes a spindle head (see also FIG. 4). Draw bars 3a and 3b are reciprocally slidable in the spindle head 6 and the main body 5. Mated. One end of the draw bar 3a on the spindle head 6 side is connected to the ball screw 12, as shown in FIG. And the drawbar 3
The protrusion 3d formed on the draw bar 3b of the main body 5 is fitted into the groove 3c formed at the end of the draw bar 3a.
a.3b are combined.

Reference numerals 1a and 1b denote a pair of sliders which are slidably fitted in a radial direction in fitting grooves 5a formed in the end portion of the main body 5 in the radial direction.
Hole cutters 2a and 2b are fixed to the tip of 1b.

The pair of sliders 1a and 1b are formed in a shape substantially symmetrical with respect to the axis 13 of the boring head 10. As shown in FIG. 2, serrations 4a and 4b formed inside these are formed. The serrations formed on both sides of the end of the draw bar 3b are engaged with each other.

The serrations 4a and 4b are arranged so that when the draw bar 3b is moved in the direction of the axis 13, the sliders 1a and 1b can move in the radial directions opposite to each other. Tilt angle θ = 15 °
(See FIG. 1 and FIG. 2). Reference numeral 12 denotes a detent groove formed on the outer periphery of the draw bar 3b, and 11 denotes a detent pin fitted into the groove 12.

Reference numeral 7 denotes a clamper fitted reciprocally slidably in the draw bars 3a and 3b. One end of the clamper 7 is connected to a rotary hydraulic cylinder 15 as shown in FIG. The rotary hydraulic cylinder 15 can reciprocate the inner surfaces of the draw bars 3a and 3b. At the other end of the clamper 7, a clamper head 7a on a flange is provided, and the clamper 7 is pulled in the direction of the arrow Y in FIG.
Can contact the end surface 1d of the sliders 1a and 1b. An air outlet 40A is provided on the back side of the clamper head 7a facing the serrations 4a and 4b where the pair of sliders 1a and 1b and the drawbars 3a and 3b engage, and the clamper 7 and the clamper head 7a are provided. The air can be ejected to the serrations 4a and 4b via an air passage 40 formed in the air passage. The clamper head 7a is covered by a cover 10A fixed to the main body 5 via a closed space 10B movable in the axial direction.

Numeral 9 denotes a cooling hole formed in the main body 5, and the cooling hole 9 communicates with a cooling hole 8 formed in the sliders 1a and 1b toward the cutter 2a and 2b mounting portions. Then, the coolant supplied from a coolant supply source (not shown) is supplied to the cutter 2a / 2b mounting portion, which can be cooled, and the temperature rise of the cutters 2a / 2b is prevented.

When the cylinder hole of the engine cylinder block 20 is machined by using the boring machine configured as described above, the work, that is, the cylinder block 20 is fixed on the work support 22, and the servo motor 11 Is driven, the ball screw 12 is rotated, and the draw bar 3a
3b is reciprocated.

When machining the cylinder hole 20a of the cylinder block 20 having a small cylinder hole diameter, as shown in FIG. 1, the draw bars 3a and 3b are moved to the left in the figure.
As a result, the serrations 4a
The sliders 1a and 1b connected by 4b move in the direction perpendicular to the center line 13 of the boring head 10, that is, in the radial direction, and the cutter diameter is settled at the position of B1 as shown in FIG.

Next, when the rotary hydraulic cylinder 15 is actuated to pull the clamper 7 in the direction of the arrow Y in FIG. 1, the inner surfaces of the clamper head 7a are moved from the position where the inner surface of the clamper head 7a has a clearance S1 to the end surfaces of the sliders 1a and 1b. , And the contact portion is brought into contact with a predetermined surface pressure by a tensile force from the rotary hydraulic cylinder 15. By this contact surface pressure, the back lash of the serrations 4a and 4b between the draw bar 3b and the sliders 1a and 1b is absorbed, and the draw bar 3b and the sliders 1a and 1b are firmly fixed.

By adjusting the cutter outer diameter B1 so as to match the cylinder hole diameter of the cylinder hole 20a by the above procedure, the cutters 2a and 2b can firmly move the sliders 1a and 1b by the clamping force (tensile force) of the clamper 7. Thus, the draw bar 3b is fixed to the draw bar 3b, and rigidity sufficient to withstand heavy cutting is maintained.

When drilling a cylinder block 20 having a cylinder hole 20a having a diameter larger than the cylinder hole diameter, the rotary hydraulic cylinder 15 is operated in the reverse direction to loosen the clamper 7. Thereby, the sliders 1a and 1b
Is movable in the radial direction with respect to the drawbars 3a and 3b, and causes the drawbars 3a and 3b to move in the opposite direction along the axis of the drawbars via the servomotor 11 and the ball screw 12. As a result, the sliders 1a and 1
b moves radially outward to a cutter diameter B2 that matches the inner diameter of the cylinder hole. At this time, air is ejected from the air ejection port 40A of the clamper head 7a to the serrations 4a and 4b to remove chips and the like.

Thereafter, the clamper 7 is moved to the position shown in FIG.
In the direction of the arrow Y. As a result, as shown in FIG. 3, the draw bar 3b moves to the right in the drawing by S2 with respect to the time of machining the front-diameter small-diameter cylinder hole 20a.
The outer diameter of 2b is enlarged by 2C from B1 to B2, and in this state, the drawbars 3a and 3b and the slider 1
a and 1b and the cutters 2a and 2b are firmly fixed.

Therefore, even when processing cylinder blocks 20 having different cylinder hole diameters, the hole processing can be performed without replacing the cutter head unlike the conventional one. Also,
Since the cutters 2a and 2b are firmly fixed to the draw bar with a predetermined cutter diameter by the clamper 7, it can sufficiently cope with heavy cutting. In the above embodiment, an example in which the present invention is applied to cylinder hole machining of a cylinder block has been described, but the present invention can be applied to other hole machining. Further, in the above embodiment, the inclined serration is used as the configuration for moving the slider in the radial direction. However, other configurations such as an inclined key may be used.

[0035]

According to the present invention, the amount of movement of the draw bar, that is, the amount of movement of the slider interlocked with the draw bar in the radial direction is adjusted in accordance with the diameter of the machining hole of the work, thereby fixing the slider to the outer peripheral end of the slider. It is possible to change the outer diameter of the cutter, and match the hole diameter,
As in the conventional case, it is possible to drill holes having different diameters without replacing the processing head. As a result, the number of setup steps for drilling holes is reduced, processing efficiency is improved, and processing costs are reduced.

Further, the cutter mechanism and the slider can be firmly fixed to the draw bar by operating the clamp mechanism by the clamp mechanism, and the rigidity enough to withstand the heavy cutting agent can be maintained.

[Brief description of the drawings]

FIG. 1 is a sectional view taken along an axis of a boring head according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a partial cross-sectional view when the outer diameter of a cutter is enlarged in the embodiment.

FIG. 4 is an overall external view of a boring apparatus for boring a cylinder block cylinder of an engine.

FIG. 5 is a partial external view of a conventional boring head.

FIG. 6 is an external view of a processing head in the conventional example.

[Explanation of symbols]

 1a ・ 1b Slider 2a ・ 2b Cutter 3a ・ 3b Drawbar 4a ・ 4b Serration 5 Body 6 Spindle Head 7 Clamper 7a Clamper Head 8,9 Cooling Hole 10 Boring Processing Head 11 Servomotor 12 Ball Screw 15 Rotating Hydraulic Cylinder 20 Cylinder Block (Work) ) 22 Work abutment

────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masaharu Takiguchi 1528 Nakashinden, Yokoi, Kobe-cho, Anpachi-gun, Gifu Prefecture Mitsubishi Materials Corporation Gifu Works (56) References JP-A-7-80701 (JP, A JP-A-63-99111 (JP, A) JP-A-6-320318 (JP, A) JP-A-61-270006 (JP, A) JP-A-8-39310 (JP, A) JP-A-6-32010 315805 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B23B 39/00 B23B 29/034

Claims (5)

(57) [Claims] (1)Hole on the workpiece side where boring is performed
Can move in the axial direction ofThe boring head is
A draw bar reciprocated in the axial direction of the hole;
Engage with the drawbar, a certain percentage as it reciprocates
To move the hole in the radial direction.
Slider and the drawbar and slide
And the drawer by the tightening force along the axis of the drawbar.
A clamp mechanism for coupling and integrating the
Drive to reciprocate the draw bar
Motion mechanism is connectedBoring equipment,The draw bar and the slider are arranged with respect to the axial direction.
Engaged by the engagement of the serrations formed at an angle
While the clamp mechanism is located inside the drawbar.
Insert a rod-shaped clamper that fits reciprocally into the
The axial direction of the boring head by the damper drive mechanism
To the front through the head at the tip of the clamper.
Press the slider and the drawbar in pressure, This allows the serration between the drawbar and the slider
The backlash of the drawbar is absorbed,
Drilling can be performed with the iron firmly fixed
A boring machine characterized in that it is configured as follows. 2. The cell of the drawbar and the slider.
Air that blows air to the application position to remove chips, etc.
The boring apparatus according to claim 1, further comprising an ejection unit . Wherein said slider includes a pair are arranged symmetrically to the axial center line of the boring head, moves opposite to the radial directions by the reciprocating movement of the draw bar, before
2. The boring apparatus according to claim 1, wherein the outer diameter of the cutter is changed via the slider . 4. The boring apparatus according to claim 1, wherein a supply path for a cutter coolant that is communicated with a cutter mounting portion at a tip end is provided in the slider . Claim 5.Hole on the workpiece side where boring is performed
Boring head that can move in the axial direction of The drive mechanism reciprocates in the axial direction of the hole.
Drawbar, The drawbar is formed to be inclined with respect to the axial direction.
For serrations In the more engaged state,
A pair is provided symmetrically about the axis of the machining head.
The drawbar reciprocates in the opposite radial direction
Move to change the outer diameter of the cutter fixed to the tip.
A slider configured to tighten, The drawbar and the slider are aligned with the axis of the drawbar.
Clamping machine that combines and integrates with each other by tightening force along the direction
And The selector, which is an engaging portion between the drawbar and the slider,
Air jetting means for jetting air to the application position, Inside the slider, communicate with the cutter mounting part at the tip
And a supply path for the cutter coolant, The clamp mechanism reciprocates in the center hole of the drawbar
A rod-shaped clamper that can be freely fitted
Move the boring head in the axial direction
The slider through the head at the tip of the clamper.
And the drawbar This allows the serration between the drawbar and the slider
The backlash of the drawbar is absorbed,
Drilling can be performed with the iron firmly fixed
A boring machine characterized in that it is configured as follows.