WO1998012015A1

WO1998012015A1 - Cutting/splitting method and apparatus for piston ring

Info

Publication number: WO1998012015A1
Application number: PCT/JP1997/003345
Authority: WO
Inventors: Masahiro Shoji
Original assignee: Komatsu Machinery Corp.
Priority date: 1996-09-20
Filing date: 1997-09-19
Publication date: 1998-03-26
Also published as: JPH1094912A

Abstract

A method of piston ring cutting/splitting is automated to improve a productivity. While the center (01) of cutting/splitting of works (24) laminated in the axial direction is kept eccentric with respect to a B axis which is parallel to the axis described above, both ends of the works are clamped from above and below by upper work support means (22) and lower work support means (23) and under this state, the work (24) are index-rotated with the B axis being the center. After the first cutting/splitting position is indexed, a rotating cutter (16) is raised in a direction of Z axis which is parallel to the B axis and then the works (24) are cut and split by the cutter (16) from one of their ends. After this cutting/splitting process, the works (24) are again index-rotated with the B axis being the center to index the next cutting/splitting position. The rotating cutter (16) is then moved again in the Z axis direction so as to conduct cutting/splitting of the next cutting/splitting position. In this manner, the cutting/splitting process is automated to improve the productivity.

Description

Description Method of splitting piston rings and splitting ponds

The present invention relates to a method and a device for cutting a piston ring. Background art

The piston ring used in conventional engines, etc. is manufactured by cutting the inner and outer peripheral surfaces of a ring-shaped work using a piston ring processing device, and then cutting the work at two locations. A processing method for producing a perfect circle piston ring by reducing the diameter of the obtained peak is generally adopted.

For example, a device as shown in FIG. 1 is used as a cutting device for cutting a workpiece on which inner and outer peripheral surfaces have been processed.

The conventional cutting device has two cutters c that can be manually moved in the a, b, and // 3 directions, and the cutter c is used to cut the workpiece d. By cutting the two parts at the same time, a piston ring that becomes a perfect circle when the diameter is reduced is obtained.

However, in the above-described conventional cutting apparatus, when the cutter c is manually moved in the direction of the cutting center P of the workpiece d to cut the workpiece d, the moving distance L i of each cutter c and the moving distance L i of the cutter d are determined. L ₂ and cutting angle If the 2 ° angle is not exactly the same, if the diameter of the cut work c is reduced, a highly round stainless steel ring with no gap in the cut area Cannot be obtained.

Conventionally, the operator manually moves the cutter c while adjusting the cutting angle α °, the angle center position, and the cutting width, so that many adjustments are required. Work efficiency is very poor because of the time required, and it is necessary to perform trial-cut machining to verify machining accuracy in order to increase processing accuracy. As a result, there was a problem that further reduced productivity. In addition, the adjustment of the cutting edge of the cutter requires a lot of skill and a lot of time is required for the changeover work, which causes a decrease in the operating rate of the machine.

SUMMARY OF THE INVENTION The present invention has been made to improve such a conventional problem, and provides a cutting method and a cutting device for a piston ring, which automates a cutting process, and provides a setup time and a cutting process. The aim is to improve productivity by significantly reducing the time required for the process. Disclosure of the invention

In order to achieve the above object, the invention according to claim 1 is characterized in that both ends of the work are eccentric with respect to the Β axis parallel to the axis, with the center of the cut of the work laminated in the axial direction. The upper work support means and the lower work support means clamp the workpiece from the vertical direction. After the cutting position is determined, rotate The cutter is raised in the Z-axis direction parallel to the B-axis, and the work is cut from one end by the cut, and after the cut, the workpiece is again moved to the B-axis. After indexing and rotating around the center to determine the next cutting position, the rotating cutter is moved in the Z-axis direction again to cut the next cutting position. Things.

With the above configuration, by reducing the diameter of the cut and processed workpiece, the opening of the butt portion is not generated, and the screw thread has a high roundness without force. In addition to the ease with which cutting can be obtained, there is no need to manually adjust the cutting position, so the setup time can be greatly reduced and trial cutting can be performed. Work efficiency is improved, and work efficiency can be improved.

In addition, since no adjustment work is required, no skill is required for the work, and the occurrence of processing defects is reduced, so that the defect rate can be reduced and the cost of the product can be reduced accordingly. It will be.

In order to achieve the above object, the invention according to claim 2 is characterized in that both ends of the work are eccentric with respect to the B axis parallel to the axis and the center of the cut of the work laminated in the axial direction. An upper work support means and a lower work support means that clamp from the vertical direction, and a work is indexed and rotated around the B axis to determine the cutting position of the work. A sliding means provided movably in the Z-axis direction parallel to the B-axis, and movable up and down in the Z-axis direction by the Z-axis motor; and The spindle head is mounted on the spindle head, which is provided on the top and can move in and out of the workpiece by the X-axis motor, and the spindle head is mounted on the spindle head. It consists of a cutting tool that rotates and cuts the work.

With the above configuration, it is possible to cut multiple parts of a workpiece with one cut. | J cutting can be performed instead of cutting with two cutting cuts in the past. Compared to the simpler configuration and smaller size of the equipment, installation space and price can be reduced, operability and maintainability are improved, and inner and outer machining for machining the inner and outer circumferences of piston rings is also possible. Since the machining time of the machine and the cutting time are almost the same, when combined with the inner and outer peripheral machining machines, there are effects such as improved balance and improved productivity.

Also, since the center of the cutting of the work is indexed and decentered from the center according to the thickness of the cutter, the axis movement for offsetting the cutter is not required. The control system for controlling each axis can be simplified.

In order to achieve the above object, the invention described in claim 3 is one in which the X-axis motor and the Z-axis motor are constituted by servomotors.

The invention according to claim 4 controls the X-axis motor 13, the Z-axis motor 5, and the B-axis indexing means 20 based on machining data input in advance to the NC device, and In this way, the multiple locations of step 24 are cut and cut by a single cut 16.

With the above configuration, the cutting of the workpiece can be automated. As a result, it will be possible to improve the machine operation rate and, consequently, the productivity. BRIEF DESCRIPTION OF THE FIGURES

The invention will be better understood from the following detailed description and the accompanying drawings, which show embodiments of the invention. The embodiments shown in the accompanying drawings are not intended to specify the invention, but merely to facilitate explanation and understanding.

In the figure,

FIG. 1 is an explanatory view showing a conventional piston ring cutting device.

FIG. 2 is a front view showing a bisto ring cutting device according to an embodiment of the present invention.

FIG. 3 is a plan view showing a biscuit ring cutting device according to an embodiment of the present invention.

FIG. 4 is a detailed view of the vicinity of the Z-axis motor of the biscuit splitting device according to the embodiment of the present invention.

FIG. 5 is a detailed view around the X-axis motor of the piston ring splitting device according to the embodiment of the present invention.

FIG. 6 is a detailed view of the vicinity of the spindle motor of the piston ring splitting device according to the embodiment of the present invention.

FIG. 7A is an enlarged view of an upper work supporting means of the cutting device for a piston ring according to the embodiment of the present invention.

FIG. 7B is an arrow view from the direction of arrow WB in FIG. 7A.

FIG. 8A A piston ring according to an embodiment of the present invention. It is an enlarged view of the lower work support means of the cutting device.

FIG. 8B is an arrow view from the arrow HB direction in FIG. 8A.

Fig. 9 is an explanatory view showing dimensions of each part of a piston ring to be cut.

FIG. 10A and FIG. 10B are explanatory diagrams showing a problem in the case where the center is aligned with the B-axis and the division is performed.

FIG. 11A and FIG. 11B are explanatory views showing a method of splitting a piston ring according to an embodiment of the present invention.

FIG. 12A and FIG. 12B are process diagrams showing a method of cutting a piston ring according to an embodiment of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described with reference to the drawings shown in FIG.

Figure 2 shows the main body of the slitting device. A column 1b is set on a bed 1a, and a pair of linear guides is provided in front of the column lb in the vertical direction (Z-axis direction). The guide rail 2 is laid, and the slide 3 is supported on the guide rail 2 so as to be slidable up and down.

A screw shaft 4 consisting of a ball screw is provided between the guide rails 2 so as to be parallel to the guide rails 2, and the screw shaft 4 is fixed to the slide 3 side. The nut member 4a is screwed together, and the upper end of the screw shaft 4 is connected to a Z-axis motor 5 consisting of a rotary shaft installed on a column lb. Screw shaft 4 rotates forward / reverse with shaft motor 5 H

By doing so, the slide 3 can be moved in the Z-axis direction.

One end of a cable 6 such as a wire is attached to the slide 3.

The other end of the cable 6 is bypassed by a pulley 7 rotatably supported on the column 1b, and then connected to a counterweight 8 provided behind the column 1b. By the action of the counterweight 8, the slide 3 can be moved by the small-capacity Z-axis motor 5.

A guide rail 9 made of a linear guide is laid on the upper surface of the slide 3 in the horizontal direction (the X-axis direction), and the guide rail 9 is arranged on the guide rail 9 in the X-axis direction. A spindle head 10 is supported for free movement.

Below the spindle head 10, there is provided a screw shaft 12, which is a ball that is parallel to the guide rail 9, as shown in FIG. 5. A nut member 12a fixed to the lower portion of the spindle head 10 is screwed to the screw shaft 12, and one end of the screw shaft 12 is Is connected to the X-axis motor 13 consisting of the servo motor installed on the side of the motor 3 via the endless belly 14 and the X-axis motor 13 turns the screw shaft 12 forward and backward. By rotating the spindle head 10, the spindle head 10 can be moved in the X-axis direction.

As shown in FIG. 6, a spindle 15 is rotatably supported on the spindle head 10 in a direction perpendicular to the X axis as shown in FIG. On one end of the spindle 15, a cut 16 made of a metal saw is detachably attached, and the other end of the spindle 15 is a worm. The motor is connected to the spindle motor 18 which is a general-purpose motor for inverter control via the speed reducer 17, and the spindle motor 18 is connected to the spindle motor 18. The tool 15 and the cutter 16 start to rotate. On the other hand, on the bead 1a of the main body 1, a B-axis indexing means 20 is provided at a position facing the column 1b with the slide 3 interposed therebetween.

The upper part of the B-axis indexing means 20 has an indexing table 20a which is indexed and rotated about the B-axis, and is located on the indexing table 20a. There is a support frame 21 that is almost C-shaped. ·

The support frame 21 is provided with an upper work support means 22 and a lower work support means 23 which are centered on the B axis and are vertically separated from each other.

At the position where the upper work support means 22 and the lower work support means 23 oppose each other, the cutting center O 1 of the work 24 stacked in the axial direction is aligned with the work center O 2 with respect to the B axis. With the clamp heads 22a and 23a provided to clamp both ends of the work 24 from the vertical direction in a state of being eccentric in the direction ε, the upper work means 22 The clamp head 22 a can be moved up and down by a clamp cylinder 25 installed on the upper part of the support frame 21.

The Z-axis mode 5 and the X-axis mode 13 and spindle The motor 18 and the B-axis indexing means 20 are controlled by an NC device (not shown) based on the previously input machining data.

Next, a description will be given of a method of cutting and processing the piston ring using the piston ring cutting device configured as described above.

When the work 24 is to be machined, the following machining data shown in Fig. 9 is input to the NC unit in advance.

L: Cutting dimensions

D: Standard processing diameter

: Cutting angle

T: Work width dimension

In addition, the inner and outer peripheral surfaces of the work 24 to be cut and processed are preliminarily laminated with a plurality of piston rings in the axial direction, and the inner and outer peripheral surfaces are processed by a not-shown biston ring processing device. After that, both ends are clamped by a hand carrier jig (not shown) so that the phases of the piston rings do not shift. It is carried in between 2 and 23.

At this time, as shown in Fig. 1OA, when the cut center of the workpiece 24 is ij, the center O1 is aligned with the B-axis of the B-axis indexing means 20 and the cutting is performed. When the diameter of the workpiece 24 that has been cut is reduced due to the thickness t of the evening 16, as shown in FIG. Ring is not obtained.

In order to prevent this, in the present invention, the thickness of the cut 16 In consideration of t, as shown in Fig. 11A, the center O 1 of the workpiece 24 is sandwiched by ε calculated by The upper and lower ends of the work 24 are clamped between the upper and lower work support means 22 and 23 by eccentricity in the opposite direction.

In other words, as shown in FIG. 11 tB, when the thickness t of the cut edge, the cutting angle H around the B-axis, and the width T of the work 24, the equation 1η

α 2

a

n

Two

After calculating the amount of eccentricity ε by the above equation, the center of division 切 1 is divided by the amount of eccentricity ε with respect to the indexing center (Β axis), as shown in Fig. 11Α. The work 24 is set between the upper and lower work support means 22 and 23 eccentrically in the opposite direction across the.

In order to facilitate the work of eccentrically positioning the work 24 by ε with respect to the B axis and setting the work 24 between the upper and lower work supporting means 22 and 23 accurately, the upper and lower work supporting means 22 and On 23, a jig that can set the work 24 so that the center of the cut IJ is eccentric with respect to the Β axis by ε is provided. As a result, the angle between the straight line connecting the side surface of the cutout 16 and the cutting center 〇2 and the center line passing through the B-axis, the work center 〇2, and the cutting center 01 are cut angles. Since the angle coincides with one half of the length, the cutting angle of the work 24 centered on the B-axis can provide a highly round piston ring.

As described above, when the setting of the work 24 is completed, the cutting of the work 24 is performed by the automatic cycle of the NC device.

First, the spindle motor 18 rotates the cutter 16 in the direction of arrow D in Fig. 2 according to a command from the NC device, and at the same time, the indexing table 20a of the B-axis indexing means 20. Is rotated about the B axis by the cutting angle α °, and the part to be cut first is determined.

Next, the X-axis motor 13 is rotated, the spindle head 10 is moved in the X-axis direction by the screw shaft 12, and the rotating cutter 16 is cut into the lower part of the work 24. It is advanced to the position as shown in Figure 12 Α.

Then, the shaft 5 is rotated, and the screw 3 raises the slide 3 in the direction of the shaft, so that the cut 16 mounted on the slide 3 causes Work 24 is cut down from the lower end.

With the rise of the slide 3, the peak 24 is cut from the lower end side to the upper end side in accordance with the cut end 16, and the cut end 16 is turned into the work 24. When the cutting of the work 24 is completed by reaching the upper end of the workpiece, the X-axis motor 14 After head 10 is retracted to its original position, slide 3 is also lowered to its original position by Z-axis mode 5.

As described above, when the cutting at the first cutting point is completed, the indexing table 20a of the B-axis indexing means 20 is rotated in the opposite direction to the above. The next cutting position is calculated. At this time, the index table 20a is cut around the B-axis. However, even if the work 24 is excessively cut, even if the diameter of the cut work 24 is reduced, a perfect circle piston ring as shown in Fig. 1B cannot be obtained. .

In order to prevent this, it is only necessary to offset the cut 16 by the thickness t in the Y-axis direction.In this method, the moving means in the Y-axis direction and the control axis for controlling this are used. If necessary, the structure and control system become complicated.

In order to solve such a problem, in the present invention, as described above, the cutting center O 1 is decentered by ε with respect to the B axis in advance in consideration of the thickness t of the cutter 16.

As a result, even if the next cutting point is cut without offsetting the cutting edge 16 by the thickness t, a gap is created at the butt as shown in Fig. 11B. It is possible to obtain a piston ring having a high degree of roundness without being twisted.

In the same way as in the first part, the spin drill head 10 is moved by the X-axis motor 13 and the rotating cutter 16 is moved to the lower part of the work 24. As shown in Fig. 12B, and then slide by the Z-axis motor 5. 3 is raised, and the work 24 is cut down from the lower end side by the cut 16.

Then, after the work is cut to the upper end of the work 24, the spindle head 10 is retracted by the X-axis motor 13 and then by the Z-axis motor 5. Slide 3 is lowered to its original position. When the cutting of the work 24 is completed as described above, the clamp head 22 a of the upper work support means 22 is raised by the clamp cylinder 25. To release the work 24 from between the upper and lower work support means 22 and 23, and then carry in the work 24 to be cut and then repeat the above operation. By inputting the machining data in advance to the NC device, the cutting process of work 24 can be performed automatically.Adjust the cutting position manually as before. No work is required at all.

In the above embodiment, the loading and unloading of the work 24 is not particularly described. However, if a work loading and unloading device such as a loader or a robot is used, the loading and unloading of the work 24 and the loading and unloading of the work 24 are performed. It is also possible to automate all cutting operations.

Claims

The scope of the claims

1. With the cutting center O 1 of the workpieces 24 stacked in the axial direction eccentric with respect to the B axis parallel to the axis, the both ends of the workpiece 24 are connected to the upper workpiece supporting means 22 and When the lower work supporting means 23 clamps the work 24 in the vertical direction, and in this state, the work 24 is indexed and rotated about the B-axis to determine the first cutting position. Then, the rotating cutting tool 16 is raised in the Z-axis direction parallel to the B-axis, and the cutting tool 16 is used to cut the work 24 from one end side and cut the workpiece. After the addition, the work 24 is indexed around the B-axis again and rotated to determine the next cutting position.Then, the rotating cutting blade 16 is moved in the Z-axis direction again, and the next cutting position is determined. A cutting method for a biscuit ring, characterized in that the cutting position is cut.

2. Clamp both ends of the work 24 from the vertical direction with the center of the cut of the work 24 stacked in the axial direction eccentric to the B axis parallel to the above axis. Upper work support means 22 and lower work support means 23, and B-axis indexing means for indexing and rotating work 24 around the B-axis to determine the cutting position of work 24 20 and a slide 3 which is provided so as to be movable in the Z-axis direction parallel to the B-axis and which can be moved up and down in the Z-axis direction by the Z-axis motor 5, and which is provided on the slide 3 The spindle head 10 is provided on the spindle head 10 and the spindle head 10 which can be moved in and out of the work 24 by the X-axis motor 13 and the spindle head 10. It is rotated by evening 18 and cuts the above work 24 to cut it. A piston ring splitting device characterized by the fact that it is provided.

3. The X-axis motors 13 and Z-axis motors 5 are composed of sub-boats, and these sub-boats are controlled by NC, so that the cutter 16 3. The cutting device for a piston ring according to claim 2, wherein the cutting feed amount is controlled.

4. Based on the machining data input to the NC device in advance, control the X-axis mode; I3, Z-axis mode 5 and B-axis indexing means 20 to move the workpiece 24 at multiple locations. 3. The cutting of the piston ring according to claim 2, wherein the cutting is performed by one cutting tool.