KR20140096729A - Tool apparatus for machining crank bore - Google Patents

Abstract

The present invention relates to a processing tool for a crank bore of heterogeneous materials. The tool is an integral tool for processing a crank bore by combining a boring tool and a honing tool, and enables a user to work for boring and honing process in one station simultaneously. When a user processes a crank bore of heterogeneous materials, the tool enhances the roundness of the crank bore by applying a guide pad. The tool also reduces the production cost and increases work efficiency by managing the two processes at the same time.

Description

Technical Field [0001] The present invention relates to a tool for crank bore machining,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tool for crank bore machining for machining crank cores having different materials and interrupted machining structures.

A cylinder block constitutes a skeleton of the engine body. The cylinder block is constituted by a plurality of cylinders capable of reciprocating the piston upward and downward in the cylinder block and combusting the mixer.

A cylinder head is mounted on the upper surface of the cylinder block. A crank bore is precisely machined on the center portion of the lower crankcase of the cylinder block. A crank shaft is inserted into the crank bore to support the crank shaft. It is important to observe the tolerances such as the roundness of the crank bore (cylinder degree).

FIG. 1 is a process diagram showing a crank bore machining method according to the prior art. The crank bore machining process includes a boring process and a honing process.

The boring process is a process of cutting a crank bore (hole) 2 at a central portion of a crankcase using a cutting tool 1. The number of holes 2 to be cut off depends on the number of pistons. For example, (# 1, # 2, # 3, # 4) by rotating the cutting tool 1 mounted inside the machining center and moving it axially over the center of the crankcase After finishing, we finish finishing (finely) in order from the beginning.

Next, the crane bore is honed by moving the station. The honing process is a process of trimming the crank bore 2, which is boring. For example, the honing process is performed using a dedicated bore processing equipment do.

On the other hand, in the crank bore 2, unlike the boring process of the cylinder, the boring process is not performed continuously in the axial direction but is performed at a constant interval and intermittently several times. This process is called intermittent cutting do.

For example, the crankshaft includes a crankshaft main journal 4 disposed on the same straight line with an interval therebetween, a crankshaft main journal 4 connected to the connecting rod 5 and rotatable about the crankshaft main journal 4, (3), and a crankshaft main journal (4), which is a part of the crankshaft, is inserted into the crank bore (2).

Due to the characteristics of the crankshaft, the crank bore 2 is disposed in the axial direction while alternating with the empty space in which the crank pin journal 3 can rotate. Therefore, when the crank bore 2 is axially bored, The processing load is not applied in the empty space.

The material of the semicircular periphery 2a (for example, aluminum) on the crank bore cylinder block side and the semicircular periphery 2b (for example, cast iron) on the crankcase seal side are different from each other with respect to the axial center line of the crank bore 2, There is a problem that the roundness becomes poor at the time of machining, and cumulative tolerance arises due to the change of the place during the honing operation.

For example, even when the same cutting force acts in the rotating direction at the time of boring, a difference in hardness between the semicircular periphery portion 2a made of aluminum and the semicircular periphery portion 2b made of cast iron causes a difference in cutting amount, A stepped portion is generated at the boundary portion where the contact is made, thereby causing a problem such as roundness (degree of cylinder) and the like.

In addition, since the honing operation is performed in the equipment dedicated to honing for bore processing in addition to the machining center (MCT) used for boring processing, there is a problem in that the cost increase and the working efficiency are lowered due to the purchase of additional equipment and equipment installation space have.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems, and it is an object of the present invention to integrate a boring tool and a honing tool into one to machine a crank bore so that boring and honing operations are simultaneously performed in one station The present invention provides a tool for crank bore machining that can reduce the cost and improve the working efficiency by improving the roundness when machining crank bores of different materials by applying guide pads and simultaneously performing the two operations.

In order to accomplish the above object, the present invention provides a tool for crank bore machining, which comprises a crank bore having different materials and an interrupted machining structure, wherein one end of the crank bore is connected to a rotatable and axially movable actuator, A movable body portion; A boring tip mounted on an end of the body portion for performing boring of the crank bore; And a honing stone part mounted at an end part of the body part in a longitudinal direction with a gap between the boring tip and performing honing of the crank bore, so that boring and honing of the crank bore can be performed at the same time.

Particularly, the honing stone part is characterized in that roundness can be improved by honing the boring crank bore.

In addition, a guide pad is mounted on the body portion to improve the concentricity and the degree of cylindricality during interrupted processing.

The guide pad is partially removed from the mounting section of the Honing Stone portion to secure a chip discharge groove for discharging the chip, thereby preventing scratches from occurring in the crank bore.

The honing stone part is inserted into the body part in the radial direction at intervals in the circumferential direction, and each honing stone part is adjustable in height in the vertical direction at the same time.

According to an embodiment of the present invention, the honing stone part is vertically adjustable in height by a slider having an upper end surface tapered and movable in an axial direction.

Further, the height of the honing stone part can be adjusted simultaneously in the vertical direction by the upper and lower stones of the stone adjusting part, the upper and lower stones adjusting parts come into contact with the tread surface at the time of contact with the honing stone part, An adjuster main body having a mounting groove into which the slider is inserted and which is axially movable; And a stopper provided on one side surface of the adjustment unit main body and restricting movement of the slider.

The stone up and down adjusting unit includes a guide bar provided on the stopper for guiding the axial movement of the slider and a return spring installed on the guide bar for returning the position of the slider to its original position by an elastic restoring force do.

And the slider is movable in an axial direction by a height adjusting screw.

Advantages of the crank bore machining tool according to the present invention are as follows.

First, in machining crank bores of different materials and interrupted machined structures using machining centers, it is possible to integrate boring tips and honing stone parts into a single tool to enable simultaneous boring and honing. Cost reduction and additional equipment installation space are unnecessary.

Second, the honing process can be improved by processing honing without moving after boring. It is possible to improve the roundness when machining different materials and improve the concentricity and cylinder degree during interrupted machining through the guide pad structure.

1 is a process diagram showing a crank bore working method according to the prior art;
2 is a perspective view of a conventional crankshaft and a cylinder block
3 is a perspective view showing a cutting direction of a crank bore of a cutting tool according to the present invention;
4 is a front view of a tool for crank bore machining according to an embodiment of the present invention.
5 is an enlarged view of part A of Fig. 4
Figs. 6 and 7 are cross-
8 is a perspective view showing a state in which a Honing Stone part is mounted on a body part according to the present invention;
FIG. 9 is a front view showing the stone vertical adjustment unit in FIG.
Fig. 10 is an exploded perspective view of Fig.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention.

4 is a front view of a tool for crank bore machining according to an embodiment of the present invention. FIG. 5 is a sectional view taken along the line A - A in FIG. 4, Fig. 6 and Fig. 7 are exploded views of Fig.

The present invention relates to a tool device for machining crank bores (11) of different materials inside a crankcase located under a cylinder block (10).

The crank bore machining tool 20 according to the present invention is a tool 20 capable of performing boring and honing at the same time. The tool 20 is mounted and used inside the machining center equipment. The machining center tool is used for honing with the honing stone 23, Roundness can be improved during processing.

In addition, the crank bore machining tool 20 according to the present invention can be detached and used for various general purpose equipment as well as machining center equipment.

The crank bore working tool 20 includes a body 21 having a cylindrical structure, a boring tip 26 and a honing stone 25 mounted on one end of the body 21, a body 21, And a shrinking portion in the form of a cone at the other end.

The shaft fixing portion is connected to and fixed to an actuator capable of rotating and axially moving in a machining center, and can rotate and move the body portion 21 in cooperation with the actuator.

The boring tip (26) is mounted on the body portion (21) and rotates and moves in the axial direction to perform a boring and interrupted machining operation.

The boring tip 26 is made of a high strength material that can cut a metal material such as aluminum and cast iron, and the rectangular plate is detachable by fastening means such as bolts at intervals along the circumferential direction of the body portion 21 Respectively.

The boring tip 26 is positioned at the most end of the body 21 and moves in the rotating direction and the axial direction so that boring can be performed to process the crank bore 11. [

At this time, a chip pocket is formed around the boring tip 26 so that the chip can be smoothly discharged.

A honeymoon stone 25 is installed in the body 21 at intervals in the circumferential direction and the honing stone 25 is also rotated by the rotation of the body 21 to honing the crank bore 11 .

The Honing Stone portion 25 is composed of six rounded honing stones 23 arranged at intervals in the circumferential direction and a shoe 24 for supporting the honing stone 23, The stone portion 25 is mounted vertically adjustable in the outer diameter direction by the stone vertical adjustment portion 30.

A method of adjusting the outer diameter of the honing stone part 25 is schematically described as follows. A lower end portion of a shoe 24 supporting the honing stone 23 is tapered and a slider The honing stone part 25 is fitted on the body part 21 movably in the outer diameter direction and when the slider 32 is moved in the axial direction, the upper surface of the honing stone part 25 is tapered 25 is moved upward by the tapered surface, that is, in the outer diameter direction, the turning radius of the honing stone portion 25 is increased.

The material of the honing stone 23 may be a honing material for honing the boring metal.

The honing stone 23 has a rectangular bar shape and one end of the rectangular plate is exposed on the outer circumferential surface of the body portion 21 and the other square plate portion extends in the radial direction of the body portion 21 When the body 21 rotates, the exposed square plate surface is rotated in contact with the boring crank bore 11 to honing the crank bore 11.

A boring tip 26 is provided at the other end of the body 21 where the work is started and a Honing stone 23 is installed at a distance from the boring tip 26 in the longitudinal direction Since the honing process is performed by the honing stone 23 after the boring process is performed by the boring tip 26, roundness can be improved at the time of forming the hole of the dissimilar material through the honing process.

The body portion 21 is provided with a boring tip 26 on which a boring tip 26 is installed at one end (opposite to the axially supported portion 22) Honing Stone (23) There is a separate installation section.

A recessed groove 28 formed continuously in the circumferential direction is formed between the mounting section of the boring tip 26 and the mounting section of the Honing Stone 23 and between the mounting section of the Honing Stone 23 and the remaining section of the body section 21 And circular springs are continuously inserted in the circumferential direction of each of the recessed grooves 28 so that both end portions of the Honing Stone 23 installed in the mounting section of the Honing Stone 23 are prevented from falling in the axial direction.

The tool device for crank bore machining according to the present invention has a guide pad (27) in the tool itself.

The guide pads 27 are provided on the outer circumferential surface of the body portion 21 in the axial direction with an interval in the circumferential direction, so that the machining load can be dispersed during interrupted cutting.

In order to increase the dispersion effect of the machining load, the guide pad 27 is disposed along the installation direction of the boring tip 26, the mounting section of the honing stone 23 and the predetermined section of the remaining body portion 21 along the longitudinal direction And a guide pad 27 is intermittently formed for each section.

The guide pads 27 are disposed alternately with the boring tips 26 in the circumferential direction while the guide pads 27 are installed in the circumferential direction of the honing stone 23, And the Honing Stone 23 alternately.

Since the guide pad 27 is disposed on the outer circumferential surface of the body 21 in the longitudinal direction and the guide pad 27 supports the crank bore 11 during boring and honing, Can be prevented from being eccentric from the center of the bore.

A chip discharge groove 27a is formed at one end of the guide pad 27 provided in the mounting section of the Honing Stone 23 and a space for discharging the chip during the honing process is secured through the chip discharge groove 27a It is possible to prevent the scratch of the crank bore 11 caused by the chip.

Hereinafter, the structure for adjusting the outer diameter of the Honing Stone part 25 will be described in detail.

The outer diameter adjustment of the Honing Stone part 25 should be adjusted up and down simultaneously. This is because the diameter of the crank bore 11 becomes poor if the six blades are not adjusted at the same time when adjusting the outer diameter.

The honing stones 23 are provided at six equal intervals in the rotating direction. Each honing stone 23 is supported by a shoe 24, and a shoe 24, which supports the Honing stone 23, Is inserted into the insertion hole formed at a predetermined interval in the circumferential direction of the body portion 21 and can not be moved in the axial direction but can be adjusted in height in the outer diameter direction.

At this time, the shoe 24 is slightly longer in both directions than the length of the honing stone 23 and protrudes in the longitudinal direction. When the shoe 24 and the honing stone 23 are mounted, The shoe 24 can be adjusted up and down without falling in the outer diameter direction because both the protruded end portions of the shoe 24 are pressed on the upper side.

FIG. 8 is a perspective view showing a state in which a Honing Stone part is mounted on a body part according to the present invention, FIG. 9 is a front view showing a stone vertical adjustment part in FIG. 8, and FIG. 10 is an exploded perspective view of FIG.

The Honing Stone part 25 is vertically adjusted in the radial direction by the stone vertical adjustment part 30. [

The stone up-and-down adjustment unit 30 is inserted and installed inside the installation section of the Honing Stone 23 of the body portion 21. [

The stone vertical adjustment part 30 includes a cylindrical adjustment part main body 31 having a mounting groove 31a spaced apart in the circumferential direction, a slider 32 inserted in the mounting groove 31a so as to be axially movable, A disc-shaped stopper 33 provided on one end surface of the adjustment unit main body 31 and a return spring 36 for moving the slider 32 to its original position.

The slider 32 can be moved in the axial direction by the individual height adjusting bolts 34 provided on the stopper 33. When the individual height adjusting bolts 34 are rotated in the locking direction, The height of the honing stone 23 can be increased by rotating the individual height adjusting bolt 34 in the unwinding direction so that each slider 32 is moved in the opposite axial direction by the individual return spring 35, (23) can be reduced.

A tapered portion is formed on the upper surface of the slider 32 so as to be smaller in a direction toward the one direction (the direction of the stopper 33), the lower end of the shoe 24 is seated on the tapered portion, The lower end of the shoe 24 rides on the tapered surface of the slider 32 to adjust the outer diameter of the Honing Stone 25.

Here, the slider 32 is simultaneously moved in the axial direction by the axial moving means.

At this time, the axial moving means may be a mechanical adjusting means using a height adjusting screw 37 such as a hexagonal bolt or the like.

For example, if the height adjusting screw 37 is moved in the axial direction by rotating the height adjusting screw 37 using a hexagonal wrench, the head portion of the height adjusting screw 37 may be rotated And in this case, the slider 32 is moved in the axial direction together with being mounted on the stone upper and lower adjustment portion 30. In this case,

On the contrary, when the height adjusting screw 37 is returned to the opposite axial direction, that is, the original position, the elastic restoring force of the return spring 36 positioned in front of the stone vertical adjustment portion 30 can be used.

In addition, the axial moving means may be an electromagnet such as a solenoid or the like.

The electromagnet may be in the form of a disk, and when the shaft is axially moved toward the slider 32 along the shaft, the slider 32 can simultaneously move in the axial direction by a repulsive force generated between the electromagnet and each slider 32.

Therefore, according to the present invention, in machining the crank bore 11 of the different materials and the interrupted machining structure using the machining center, the boring tip 26 and the honing stone portion 25 are integrally integrated with the tool 20, And honing can be operated at the same time, so there is no need for separate dedicated honing equipment, thus reducing cost and additional equipment installation space.

In addition, the honing process can be performed without any movement after the boring process, thereby improving the roundness at the time of processing different materials, and the concentricity and cylindricality can be improved during interrupted processing through the structure of the guide pad 27.

10: Cylinder block
11: crank bore
20: Tools
21:
22: Axis Branch
23: Honing Stone
24: Shoe
25: Honing Stone Department
26: Boring tips
27: Guide pads
28:
30: Stone up and down adjustment unit
31:
32: Slider
33: Stopper
34: Individual height adjusting screw
35: Individual return spring
36: return spring
37: Height adjustment screw

Claims (9)

CLAIMS 1. A tool device for crank bore machining with different materials and interrupted machining structures,
A body portion (21), one end of which is connected to the rotatable and axially movable actuator, and which is rotatable and axially movable;
A boring tip 26 mounted on an end of the body portion 21 for performing boring of the crank bore 11; And
A honing stone portion 25 mounted at a distance from the end of the body portion 21 in the longitudinal direction with respect to the boring tip 26 to perform honing of the crank bore 11;
, And the boring and honing of the crank bore (11) can be carried out at the same time.
The method according to claim 1,
Wherein the honing stone part (25) is capable of improving the roundness through honing of the boring crank bore (11).
The method according to claim 1,
Wherein a guide pad (27) is mounted on the body portion (21) so as to improve the concentricity and the degree of cylinder in interrupted machining.
The method of claim 3,
The guide pad 27 is partially removed from the mounting section of the honing stone portion 25 to secure a chip discharge groove 27a capable of discharging the chip to prevent the occurrence of scratches in the crank bore 11 A tool device for crank bore machining.
The method according to claim 1,
Characterized in that the honing stone portion (25) is inserted into the body portion (21) in the radial direction at intervals in the circumferential direction, and the height of each honing stone portion (25) Device.
The method according to claim 1,
Wherein the honing stone part (25) is vertically adjustable in height by a slider (32) having an upper end surface tapered and movable in the axial direction.
The method of claim 5,
The height of the honing stone part 25 can be adjusted in the vertical direction simultaneously by the stone vertical adjustment part 30,
A slider (32) in contact with the honing stone portion (25) by a tapered surface and movable in an axial direction;
(31) having a mounting groove (31a) into which the slider (32) is inserted and which is axially movable;
A stopper 33 installed on one side surface of the adjuster main body 31 and restricting movement of the slider 32;
Wherein the crank bore is formed of a metal.
The method of claim 7,
A guide bar provided on the stopper 33 for guiding axial movement of the slider 32 and a return spring 36 provided on the guide bar for restoring the position of the slider 32 to its original position by an elastic restoring force Wherein the crank bore is formed in a cylindrical shape.
The method according to claim 6 or 7,
Wherein the slider (32) is movable in the axial direction by a height adjusting screw (37).

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