JPH10249605A - Tool interference prevention method and device for piston ring working machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent mutual interference of tools when the inner and outer surfaces of a piston ring are simultaneously worked. SOLUTION: This method is to control U axis of which movable range is limited and X axis which moves a tool 5 for outer surface machining to a direction to cross at right angle with a rotation core in synchronized with rotation. In this case, before machining is started controlling U axis and X axis simultaneously, machining data for a work 1 of a work object are input, and data which fit in with the length of an inner diameter of the machining data are selected from cutting tool cartridge data of maximum workable inner diameter data and minimum workable inner diameter data which are memorized previously for each cutting tool cartridge. Based on the machining data and the selected cutting tool cartridge data, each maximum allowable stroke quantity for U axis and X axis in cutting tool cartridge to be fitted, is calculated, and then based on this each maximum allowable stroke quantity, the existence of tool interference is checked before starting the movement.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tool for preventing interference between a tool for machining an internal surface and a tool for machining an external surface of a machine for simultaneously machining an inner surface and an outer surface of a piston ring. Regarding the method.

[0002]

2. Description of the Related Art A piston ring of an engine has a ring shape having a gap with its outer periphery partially cut off. When this piston ring is fitted into an upper groove of the piston, the opening of the gap is reduced to fit into the cylinder. After that, the piston ring is brought into close contact with the inner wall of the cylinder by the elastic force of the piston ring. As described above, since the piston ring is required to be able to keep tightness in close contact with the inner wall of the cylinder, it is necessary to increase the cutting accuracy of the inner surface and the outer surface thereof. For this reason, there have been proposed many internal and external surface processing machines capable of cutting the inner surface and the outer surface of the piston ring with high precision by NC control. For example, JP-A-8-2495
No. 72 discloses an inner / outer surface processing machine for a non-circular work such as a piston ring. A conventional inner / outer surface processing method will be described below with reference to FIG.

FIG. 8 is a diagram showing a workpiece before machining the inner surface and the outer surface of the piston ring and a ring shape after the machining. In FIG. 1, a workpiece 1 is a hollow material having a substantially cylindrical shape, and a plurality of ring members 2 having a predetermined height L1 corresponding to a desired piston ring groove width are stacked. A support device (not shown) is provided on both end surfaces (upper and lower end surfaces in the drawing) of the workpiece 1 in the direction of the cylindrical axis, and the support device allows the workpiece 1 to have a predetermined size from both end surfaces. It is supported by the clamping force. Furthermore, a tool 4 for cutting the inner surface and a tool 4
And a bowling bar 93 with
A tool 5 for cutting the outer surface is provided outside the workpiece 1. While the workpiece 1 is supported by the support device, the workpiece 1 is rotated about the rotation axis O in the illustrated direction, for example, in the direction of arrow 13, and the tool 4 and the tool 5 are reciprocated in the direction of arrow 11 in synchronization with this rotation. , And work material 1
The ring 3 is manufactured by driving in the cylindrical axis direction (for example, the direction of arrow 12 in the figure). Although the ring 3 has a substantially heart shape, a portion P corresponding to a concave portion on the outer periphery is cut by a cutting device (not shown) and removed to complete a piston ring.

[0004]

On the other hand, in the control shaft for machining the inner surface of the piston ring as described above, cutting must be performed with the boring bar 93 inserted into the hollow portion of the workpiece 1. Therefore, it is necessary to prevent the boring bar 93 from interfering with the workpiece 1. Since the workpiece 1 must be rotated at high speed and the inner surface machining axis must be controlled in complete synchronization with the rotation angle, the rigidity of the boring bar 93 needs to be increased. The outer diameter of 93 is inevitably large so as to obtain a predetermined rigidity. As a result, as shown in FIG.
There is no margin in the distance α between the outer surface of the workpiece and the supporting device (the lower work supporting means 33 in the figure) below the workpiece 1, and the movable range of the inner surface processing axis is very narrow.

[0005] Even if the inner and outer diameters of the workpiece 1 vary from small to large, the outer surface machining axis for machining the outer surface has a wide movable range and the moving distance can be freely set. Therefore, it can be dealt with without replacing the tool 5 (usually called a permanent tool). However, since the movable range of the inner surface machining axis is extremely narrow as described above, it is not possible to cut the workpiece 1 having various inner diameters with only one type of tool 4. For this purpose, the workpiece 1
The cartridge of the tool 4 (hereinafter referred to as a bite cartridge) can be replaced according to the size of the inner diameter of the tool 4. FIG. 10 is a view for explaining the operation at the time of replacement of the bite cartridge. In FIG. 10A, the bite cartridge 6 corresponding to the workpiece 1 having the inner diameter D1 is shown.
FIG. 10 (2) shows an inner diameter D1.
This shows a case where a bite cartridge 6 corresponding to a workpiece 1 having a larger inner diameter D2 is mounted. in this way,
When the bite cartridge 6 is attached to the upper end portion of the boring bar 93, the distance between the axis of the boring bar 93 and the cutting edge of the bite cartridge 6 is different. By preparing only the following types, the inner surface machining axis corresponds. The replacement of the byte cartridge 6 is performed by an operator at the time of setup change according to a correspondence table between the predetermined inner diameter length and the type of the byte cartridge 6, and the like.
After the replacement work, the operator can use the boring bar 9.
The distance data from the shaft center of No. 3 to the blade edge of the exchanged bite cartridge 6 is inputted to a controller (not shown) by a predetermined input switch or the like.

However, when the operator replaces the bite cartridge 6, the distance data to the cutting edge may be erroneously input. In this case, the interference between the tool 4 and the tool 5 during the machining, or , Bowling bar 93
May interfere with the lower work supporting means 33. In order to prevent this, to check visually for the presence of this interference immediately before actually starting machining,
The feed speeds of the inner surface machining axis and the outer surface machining axis are checked, for example, by a speed override operation or the like so as to be lower than the actual machining time. However, the cutting edge of the tool 4 and the tool 5, or the contact portion between the outer surface of the boring bar 93 and the lower work supporting means 33 is located deep inside the piston ring processing machine. Since there is a protective door or the like on the front side of the worker, the contact is difficult to see. Therefore, there is a problem that it is very difficult for an operator to confirm, and even if there is a risk of interference, the determination of the operator is delayed and interference cannot be prevented.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has a tool interference preventing device for a piston ring processing machine which prevents mutual tool interference when simultaneously processing the inner surface and the outer surface of a piston ring. It is intended to provide a method.

[0008]

Means for Solving the Problems, Action and Effect In order to achieve the above object, the invention according to claim 1 supports a hollow cylindrical workpiece 1 from the direction of the cylindrical axis and supports the hollow cylindrical work 1 in the direction of the cylindrical axis. And a bite cartridge 6 that is selected according to the inner diameter length of the plurality of different types of the work 1 and that cuts the inner surface of the work 1, in synchronization with the rotation shaft. Controlled so as to move the bite cartridge 6 in a direction orthogonal to the rotation axis, a U-axis whose movable range is restricted to a predetermined position, and a control in synchronization with the rotation axis; An X-axis for moving a tool 5 for processing the outer surface of the workpiece 1 in a direction orthogonal to the rotation axis, and a tool interference prevention device for a piston ring processing machine for processing the piston ring by cutting the inner and outer surfaces of the work 1. At Byte cartridge data storage means 52 for storing byte cartridge data of maximum inner diameter data and minimum inner diameter data and a byte cartridge part number corresponding to each of the plurality of different byte cartridges 6, and a machining target before starting cutting. Processing work data input means 53 for inputting processing data representing the shapes of the inner surface and the outer surface of the work 1; and the byte cartridge data and the byte of the byte cartridge 6 which match the processing data input by the processing work data input means 53. Cartridge selection means 54 for selecting a cartridge part number from the byte cartridge data storage means 52
And a maximum allowable stroke amount ST1 of the U-axis from the mechanical origin of the U-axis when the compatible byte cartridge 6 is mounted, based on the input machining data and the selected byte cartridge data, and the X-axis. Maximum stroke amount calculating means 56 for calculating the maximum allowable X-axis stroke amount ST2 from the mechanical origin of the U-axis, the calculated maximum U-axis allowable stroke amount ST1 and the maximum allowable X-axis stroke amount
Before starting cutting by simultaneously controlling the U axis and the X axis based on ST2, the cutting tool 6 and the tool 5
And a U-axis / X-axis interference check means 57 for checking whether there is interference with the U-axis / X-axis.

According to a second aspect of the present invention, the hollow cylindrical work 1 is supported from the direction of the cylindrical axis and rotated around the cylindrical axis, so that a plurality of different types of inner diameter lengths of the works 1 are supported. A U-axis whose corresponding inner surface of the work 1 is cut by moving the bite cartridge 6 selected correspondingly to the direction perpendicular to the rotation axis, and a movable range of which is limited to a predetermined position; An X axis for moving a tool 5 for machining the outer surface of the workpiece 1 in a direction orthogonal to the rotation axis is controlled in synchronization with the rotation of the work 1, and the piston ring is cut by cutting the inner and outer surfaces of the work 1. In the method for preventing tool interference of a piston ring processing machine to be processed, before starting cutting by simultaneously controlling the U-axis and the X-axis, input processing data representing the shape of the inner surface and the outer surface corresponding to the workpiece 1 to be processed. And multiple Byte cartridge data of the maximum inner diameter data and minimum inner diameter data that can be processed and stored in correspondence with each of the different byte cartridges 6, and byte cartridge data that matches the inner diameter length of the input processing data from among the byte cartridge part numbers and A part number of the byte cartridge is selected, and based on the processing data and the selected byte cartridge data, the U-axis maximum allowable stroke amount ST1 from the mechanical origin of the U-axis when the compatible byte cartridge 6 is attached; and X-axis maximum allowable stroke ST2 from X-axis mechanical origin
Then, the bite cartridge 6 and the tool 5 are determined based on whether or not each target movement position falls within a startable range based on the calculated U-axis maximum allowable stroke amount ST1 and X-axis maximum allowable stroke amount ST2. It is a method of checking whether there is interference with the vehicle before starting the movement.

According to the first or second aspect of the present invention, a bite cartridge suitable for machining data such as inner diameter data of an inner surface to be machined and outer diameter data of an outer surface of a workpiece to be machined is automatically selected. Then, based on the bite cartridge data corresponding to the selected bite cartridge and the machining data, an inner surface machining axis (U) necessary for cutting the workpiece to be machined and free from interference.
Axis) and the external machining axis (X-axis) from the machine origin are calculated the maximum allowable stroke amount, and based on the maximum allowable stroke amount, whether there is mutual tool interference before the U-axis or X-axis movement starts I'm checking. Therefore, interference is prevented before moving, so that safety is improved.

According to a third aspect of the present invention, in the method for preventing tool interference of a piston ring processing machine according to the second aspect, a method of displaying the selected part number of the bite cartridge on a display unit 44 is provided.

According to the third aspect of the present invention, the part number of the automatically selected byte cartridge is displayed to instruct the operator to change the setup. This eliminates a selection error due to an operator's misunderstanding or the like, and allows a correct byte cartridge to be mounted. As a result, mutual interference between the bite cartridge and the external surface processing tool can be eliminated.

According to a fourth aspect of the present invention, in the method for preventing tool interference of the piston ring processing machine according to the third aspect, the worker removes the bite cartridge 6 based on the part number of the bite cartridge displayed on the display 44. The way to replace it.

According to the fourth aspect of the present invention, the operator replaces the byte cartridge at the time of setup change based on the displayed part number of the bite cartridge, so that it is possible to prevent erroneous mounting. Therefore, it is possible to eliminate mutual interference between the bite cartridge and the external surface processing tool.

[0015]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a piston ring processing machine according to an embodiment of the present invention; FIG.

FIG. 1 is a front view showing an example of a piston ring processing machine according to the present invention, and a schematic configuration of the processing machine will be described with reference to FIG. A column 22 is installed substantially at the center rear of the upper part of the bed 21. In front of the column 22, a workpiece 1 (for example, a ball-type linear guide or the like) laid on the front surface of the column 22 is provided. Hereinafter, it is referred to as the work 1) in the cylindrical axis direction (Z
A Z-axis slide 25 movably supported in the axial direction) is provided. Further, a Z-axis motor 24 composed of, for example, a servomotor or the like is provided at an upper portion of the column 22.
The Z-axis slide 25 is driven up and down by the Z-axis motor 24. The Z-axis motor 24 is provided with a Z-axis position sensor 26 for detecting the position of the Z-axis slide 25 in the Z-axis direction, for example, an encoder or the like.

A support device for clamping and supporting the work 1 is provided in the Z-axis slide 25. The support devices are vertically separated from each other and are arranged at positions facing each other. An upper work support means 32 and a lower work support means 33 are provided. The two support means are rotatably supported in the same direction by a drive transmission means such as a gear train (not shown).
1 allows the motor to be rotated synchronously via the drive transmission means. The C-axis motor 31 is provided with a C-axis position sensor 34 that detects the rotational position of the upper work support means 32 and the lower work support means 33 in the C-axis direction, for example, an encoder or the like.

The upper work supporting means 32 is vertically movably supported, and is vertically moved by a hydraulic cylinder (not shown) provided above the Z-axis slide 25. Due to the expansion and contraction of the hydraulic cylinder, the work 1 is clamped between the upper clamp head 32a provided below the upper work supporting means 32 and the lower clamp head 33a provided above the lower work supporting means 33. A front door 36 having a transparent glass window at a substantially central portion is provided at the front of the Z-axis slide 25 so as to be openable and closable. Preventing.

An outer surface processing means 70 for processing the outer surface of the work 1 is provided substantially in the middle of the column 22. The outer surface processing means 70 is attached to the column 22 and the tool supporting means 72 for supporting the tool 5 attached to the tip end, and the tool supporting means 72 is horizontally
X guide means 73 for movably guiding in a direction (X direction) approaching or leaving the work 1, and an X-axis comprising, for example, a servomotor or the like attached to the X guide means 73 via a cover 74. Motor 71 and X-axis motor 71
And a transmitting means 75 composed of, for example, a ball screw or the like for transmitting the rotational force of the tool supporting means 72 in the moving direction of the tool supporting means 72. Further, the X-axis motor 71 is provided with an X-axis position sensor 76 which is configured by, for example, an encoder or the like and detects the position of the tool 5 in the X-axis direction. The rotation of the X-axis motor 71 moves the tool support means 72 in the X direction so that the tool 5 can cut the outer surface of the work 1.

Further, an inner surface processing means 90 for processing the inner surface of the work 1 is provided above the bed 21 and in front of the column 22. The inner surface processing means 90 includes a boring bar 93 that is disposed in the hollow portion of the workpiece 1 and supports the tool 4 attached to the upper end, a U-axis slide 92 that supports the boring bar 93, and a U-axis slide 92 that supports the boring bar 93. A guide rail 94 for supporting the axis slide 92 horizontally and movably in a direction approaching or leaving the workpiece 1 (U-axis direction); and the U-axis slide 92 on the guide rail 94 in the U-axis direction. And a U-axis motor 91 composed of, for example, a linear motor. A U-axis position sensor 95 for detecting the position of the U-axis slide 92 is provided in the vicinity of the guide rail 94, and the U-axis position sensor 95 is composed of, for example, a linear scale or the like. Also, the upper end of the boring bar 93, that is,
The position of the tool 4 is set so as to enter the hollow portion of the work 1, and the inner surface of the work 1 can be cut by the tool 4 by driving the U-axis motor 91.

FIG. 2 is a block diagram showing a hardware configuration of a device for preventing tool interference of a piston ring working machine according to the present invention. The work data input switch 41 is a switch for inputting and setting processing data representing the shape of the inner surface and the outer surface of the work 1 to be processed to be processed. In the present embodiment, as the processing data, as shown in FIG. 3, an outer diameter reference diameter DL, a maximum lift amount L, and a width dimension T are set. However, the outer diameter reference diameter DL represents the minimum diameter of the outer surface, the maximum lift amount L represents half the difference between the maximum diameter of the outer surface and the outer diameter reference diameter DL, and the width dimension T represents the inner surface of the ring 3 and the outer surface. , That is, the radial width.
The work data input switch 41 includes, for example, a switch for specifying the type of the processing data, a numeric keypad for inputting a numerical value of the data, a switch for inputting the type of work, a write switch for capturing the input data, and the like. . Each switch signal is transmitted to the control device 50.
Is output to

The work data storage means 51 is a memory for preliminarily storing the machining data input by the work data input switch 41 for each of a plurality of different work types. The work data storage means 51 is composed of, for example, a semiconductor memory, a floppy disk, a hard disk, or the like, and may be a device such as an IC memory card that can be freely inserted and removed from a reading device.

The byte cartridge data storage means 52 is a memory in which unique data (hereinafter referred to as byte cartridge data) for each of a plurality of different byte cartridges 6 is stored in advance. It is stored in correspondence with each product number (corresponding to an identification number). As the byte cartridge data, at least a maximum machining inner diameter and a minimum machining inner diameter that can be cut by the byte cartridge 6 of the product number are set. The byte cartridge data storage means 52, like the work data storage means 51, is composed of, for example, a semiconductor memory, a floppy disk, a hard disk, or an IC memory card.

The work selection switch 43 is a switch for selecting the type of the work to be processed, and is constituted by, for example, a switch for inputting a work number corresponding to the work type. Then, a work type signal (for example, a work number or the like) corresponding to the selected work type
Is output to the control device 50.

In this embodiment, the control device 50 comprises a machining program creating device 50a and a machine control device 50b. The processing program creation device 50a is configured by a computer device mainly including a microcomputer, for example. The machining program creation device 50a inputs machining data from the work data input switch 41, or
The processing data corresponding to the work type signal input from the work data storage unit 51 is read out. Then, based on the input or read processing data, reference trajectory data of each NC control axis (U axis, X axis, and Z axis) for cutting the processed workpiece is automatically created. In addition,
This reference trajectory data is represented by minute movement amount data of each axis for each predetermined cycle processing time for performing servo control of each axis, and each minute movement amount data does not generate a large acceleration exceeding a predetermined value. Is calculated as follows.

Further, the machining program creation device 50a
Based on the input or selected machining data, the length range of the inner diameter to be machined is calculated, and the byte cartridge data and the product number that match this range are read from the byte cartridge data storage means 52. Further, based on the read-out bite cartridge data and the machining data, a calculation method described below is used to prevent the inner surface cutting tool 4 and the outer surface cutting tool 5 from interfering with each other, and The maximum allowable stroke amount from the mechanical origin of each of the U-axis and the X-axis, which is the minimum required for the cutting, is calculated. And the reference trajectory data,
The maximum allowable stroke amounts of the U-axis and the X-axis and the part number of the byte cartridge data are transmitted to the processing machine control device 50b by the communication 50c. The communication 50c can be configured by, for example, serial communication, parallel communication, data I / O communication, or the like.

The processing machine control device 50b, like the processing program creation device 50a, comprises a computer device mainly composed of, for example, a microcomputer. The processing machine control device 50b sets the target position of the minute movement amount data for each of the periodic processes to the input U-axis and X-axis.
It is checked whether there is a possibility that the U-axis and the X-axis interfere with each other depending on whether the axes are within the movable range based on the maximum allowable stroke amounts, and the result is displayed on the display 44. Further, the part number of the byte cartridge data is displayed on the display unit 44, whereby the operator can confirm the part number and give an instruction for setup change. Further, based on the reference trajectory data, a control command is output to the servo shaft driving means 60 of the piston ring processing machine to perform cutting.

The display 44 can display the result of the interference check between the U axis and the X axis, or can display the part number of the byte cartridge data at the time of setup change. The display 44 is configured by a graphic display such as a CRT display, a liquid crystal display, and an EL display, or is configured by a character display and a lamp display using an LED display element or the like.

The servo axis driving means 60 controls the U-axis, X-axis, Z-axis, and C-axis servo motors in FIG. 1 based on the control command from the processing machine control device 50b. . The servo axis driving means 60 is composed of, for example, a servo amplifier for each axis.

FIG. 4 is a functional block diagram showing a tool interference preventing device for a piston ring working machine according to the present invention. The processed work data input means 53 is for inputting the processed data of the work to be processed, and outputs the processed data to the cartridge selecting means 54 and the maximum stroke amount calculating means 56. Here, the work data input means 53 is, for example, a work data input switch 41.
Alternatively, it may be an input unit that reads out the processing data of the work type selected by the configuration of the processing workpiece selection switch 43 and the workpiece data storage unit 51 from the workpiece data storage unit 51. Further, the processing work data input means 53 is not limited to this. For example, processing data may be input by communication from a host computer.

The byte cartridge data storage means 52 stores the data of the byte cartridge 6 corresponding to each byte cartridge part number as described above. Then, the cartridge selecting means 54 stores the part number of the byte cartridge 6 and the byte cartridge data which are suitable for the cutting of the inner surface thereof on the basis of the inputted processing data.
And read it out. The part number of the selected byte cartridge 6 is outputted to the selected cartridge part number display means 55, and the byte cartridge data is outputted to the maximum stroke amount calculating means 56.

Here, the selection of the suitable bite cartridge 6 can be made as follows. That is,
First, based on the data of the outer diameter reference diameter DL, the maximum lift amount L, and the width dimension T in the processing data, the following formula 1
And the minimum inner diameter DMIN of the inner surface of the work piece by Equation 2.
And the maximum inner diameter DMAX.

## EQU1 ## DMIN = 2 (DL / 2-T)

DMAX = 2 (DL / 2−T + L) Next, the obtained data of the minimum inner diameter DMIN and the maximum inner diameter DMAX, the stroke amount required when approaching the work 1 at the start of processing, and the work 1 at the end of processing. In consideration of the stroke amount required to escape from
Calculate the minimum movement inner diameter and maximum movement inner diameter of the shaft. The cartridge data satisfying the minimum moving inner diameter and the maximum moving inner diameter, that is, satisfying the formula “minimum processing inner diameter data ≦ moving minimum inner diameter” and the formula “moving maximum inner diameter ≦ maximum processing inner diameter data”. The bite cartridge 6 having the minimum machining inner diameter data and the maximum machining inner diameter data that can be cut is selected. At this time, when there are two or more types of satisfied byte cartridges 6, for example, the byte cartridge 6 with a small part number may be selected.

The maximum stroke amount calculating means 56 is designed to prevent the tool 5 from interfering with the tool cartridge 5 of the selected part number based on the input byte cartridge data and the machining data of the work 1. The maximum permissible movement range (maximum permissible stroke amount) of the U-axis and the X-axis which is permissible for processing the inner surface and the outer surface according to the processing data is calculated, and this data is output. Here, FIG.
A method of calculating the maximum allowable stroke amounts of the U-axis and the X-axis will be described based on the following. Now, it is assumed that the selected bite cartridge 6 is attached to the upper end of the boring bar 93. Further, the mechanical origins G1 and G2 are absolute reference positions of the processing machine main body which are used as references when moving each axis. For example, when the position sensor of each axis is an incremental encoder, the origin return complete position is defined as the mechanical origin. Can be set. At this time, the U-axis maximum allowable stroke amount ST1 is the maximum inner diameter d1 of the inner surface of the workpiece to be machined.
It can be calculated as the maximum moving distance from the mechanical origin G1 of the U axis which covers (determined by the processing data as described above). Similarly, the X-axis maximum allowable stroke ST2 also covers the X-axis mechanical origin G2 such that it covers the minimum outer diameter d2 of the outer surface of the workpiece to be machined.
It is calculated as the maximum moving distance from. At this time, the U-axis maximum allowable stroke ST1 and the X-axis maximum allowable stroke
ST2 is an area A where the U and X axes cannot enter each other.
Is calculated so as to exist in the work 1.

U-axis / X-axis interference checking means 57
Input the calculated maximum allowable stroke amount ST1 of the U-axis and the maximum allowable stroke amount ST2 of the X-axis. Based on these data, check whether there is interference between the U-axis and the X-axis when the NC control axis is moved. Check. That is, the movement target positions of the U-axis and the X-axis are respectively the U-axis maximum allowable stroke amount ST1.
Also, it is checked whether it is within the range limited by the X-axis maximum allowable stroke amount ST2. If the result of the check does not fall within the restricted range, an error message is displayed on the display 44 to urge the operator to take action. Further, the selected cartridge part number display means 55 displays the selected part number of the byte cartridge on the display 44, and instructs the operator to change the setup.

FIG. 6 shows an example of a flow chart for explaining a check procedure for preventing tool interference of the piston ring processing machine according to the present invention. In the figure, each step number is represented by adding S. First, in S1 (processed work data input means 53), processed data is input by the work data input switch 41. Alternatively, the processing data corresponding to the type of the work to be processed input by the processing work selection switch 43 is selected from within the work data storage unit 51. Next, in S2 (cartridge selection means 54), based on the input or selected processing data, the minimum inner diameter DMIN and the maximum inner diameter DMIN of the inner surface of the workpiece are processed.
MAX and calculate the minimum inner diameter DMIN and the maximum inner diameter DMAX
Is read from the byte cartridge data storage means 52. Then, in S3 (cartridge selection means 54), the byte cartridge part number corresponding to the read byte cartridge data is read. Thereafter, in S4 (maximum stroke amount calculating means 56), the U-axis maximum allowable stroke amount ST1 is calculated based on the read byte cartridge data and the selected processing data. The X-axis maximum allowable stroke amount ST2 is calculated based on this.

Next, at S6 (selected cartridge part number display means 55), the part number of the byte cartridge is displayed on the display 44, and the operator is instructed to change the setup. The operator replaces the byte cartridge 6 according to this instruction. Further, in S7 (U-axis / X-axis interference checking means 57), the calculated U-axis maximum allowable stroke amount ST1 and X-axis maximum allowable stroke amount ST2 and the mechanical origin G of the U-axis and X-axis are set.
1. Based on the position data of G2, it is checked whether or not there is a movement command in the NC program that causes interference between the U-axis and the X-axis.
In S8, an error is displayed on the display 44 to urge the operator to take action. If there is no movement command causing interference in S7,
This check flow ends.

In the above flowchart, S4
And S5, and S6 and S7 may be reversed. In S1, the work selection switch 4
Although the processing data is selected corresponding to the input work type in step 3, the present invention is not limited to this, and processing data of the work 1 to be processed may be input. Therefore, for example, the work data input switch 41
The suitable byte cartridge data may be directly selected from within the byte cartridge data storage means 52 on the basis of the processing data input by (1).

Here, a specific example of the interference check method in S7 will be described. The calculated U-axis maximum allowable stroke amount ST1 and X-axis maximum allowable stroke amount ST2 are the mechanical origins G1 and G2 of the U-axis and X-axis, respectively.
Since the maximum allowable movement amount is indicated, when the actual work 1 is cut, it is checked whether or not the target positions during the NC control of the U-axis and the X-axis are within the allowable range. There is a need. As a timing for performing this check, there is a method that is performed immediately before each movement of the U-axis or the X-axis, and a method that is performed for all movement commands in the NC program before starting machining. . Here, before starting machining, when checking whether or not the target position is within the movable range (soft limit) for all the movement commands in the NC program, a soft limit check by a normal NC function (for example, , Stored stroke check before movement) may be used.

FIG. 7 shows an example in which a movable range check is performed by the NC program. Sequence number N in the figure
In step 001, a parameter input for performing a soft limit check is declared, followed by a sequence number N.
In 002 and N003, the X-axis maximum allowable stroke amount ST2 and the U-axis maximum allowable stroke amount ST1 are set as these parameters, respectively. Then, the sequence number N004 declares the end of the parameter input, and the sequence number N005 indicates a soft limit check based on the parameter (stored stroke check before movement).
Has been done. That is, it is checked whether or not the movement target position is within the set soft limit for all the movement commands described in the steps of the sequence numbers thereafter. As a result, the software limit is checked before starting the execution of the NC program. If the result of this check indicates that the movement target position is other than the software limit, an error message is output to the display 44. The error message indicates the possibility of interference between the U-axis and the X-axis, so that it is possible to prevent the tool from interfering before actually machining the work.

As described above, the byte cartridge 6 suitable for the inner diameter data of the inner surface to be machined and the outer diameter data of the outer surface of the work to be machined is automatically selected from the byte cartridge data storage means 52, and the selected one is selected. The part number of the byte cartridge 6 is displayed to instruct the operator to change the setup. Thereby, the operator can attach the correct bite cartridge 6. Further, based on the selected bite cartridge data and the inner diameter data and the outer diameter data of the processed work, an inner surface processing axis (U) necessary for cutting the work 1 and free from interference.
Axis) and the maximum allowable stroke of the external machining axis (X-axis) are determined, and the maximum allowable stroke is used to determine whether there is interference between the tools 4 and 5 before the movement of the internal machining axis or the external machining axis starts. Is checked. Therefore, interference is prevented before moving, so that safety is improved.

[Brief description of the drawings]

FIG. 1 shows a front view of an example of a piston ring processing machine according to the present invention.

FIG. 2 is a block diagram showing a hardware configuration of a tool interference prevention device according to the present invention.

FIG. 3 is an explanatory diagram of processing data according to the present invention.

FIG. 4 shows a functional block diagram of a tool interference prevention device according to the present invention.

FIG. 5 is an explanatory diagram of a method of calculating a maximum allowable stroke amount of the tool interference prevention device according to the present invention.

FIG. 6 shows an example of an interference check flowchart of the tool interference prevention device according to the present invention.

FIG. 7 shows an example in which an interference check is performed by the NC program of the tool interference prevention device according to the present invention.

FIG. 8 is an explanatory view of inner and outer surface processing of a piston ring according to the present invention.

FIG. 9 is an explanatory diagram of a distance allowance between a boring bar and a work supporting means of a piston ring processing machine according to a conventional technique.

FIG. 10 is an operation explanatory view when the bite cartridge of the inner surface processing shaft of the piston ring processing machine according to the prior art is replaced.

[Explanation of symbols]

1 ... work material (work), 2 ... ring material, 3 ... ring,
4, 5 tool, 6 tool tool cartridge, 11, 12,
13 ... arrow, 21 ... bed, 22 ... column, 24 ... Z-axis motor, 25 ... Z-axis slide, 26 ... Z-axis position sensor,
31 ... C-axis motor, 32 ... Upper work support means, 32a
... upper clamp head, 33 ... lower work support means, 3
3a: Lower clamp head, 34: C-axis position sensor, 3
6 front door, 41 work data input switch, 43
... Processing work selection switch, 44 display, 50 control device, 50a processing program creation device, 50b processing machine control device, 50c communication, 51 work data storage means, 52 byte data storage means, 53 …
Processing work data input means, 54 cartridge selection means, 55 ... selected cartridge part number display means, 56 ... maximum stroke amount calculation means, 57 ... U-axis / X-axis interference check means, 60 ... servo axis drive means, 70 ... external surface processing means ,
71: X-axis motor, 72: Tool support means, 73: X guide means, 74: Cover, 75: Transmission means, 76: X-axis position sensor, 90: Inner surface processing means, 91: U-axis motor, 9
2: U-axis slide, 93: boring bar, 94: guide rail, 95: U-axis position sensor.

Claims (4)

[Claims] 1. A rotary shaft for supporting a hollow cylindrical workpiece (1) from a direction of a cylindrical axis and rotating around the cylindrical axis, and a plurality of different types of inner diameters of the workpieces (1). A bite cartridge (6) that is selected correspondingly and that cuts the inner surface of the work (1); and a direction that is controlled in synchronization with the rotation axis and moves the bite cartridge (6) perpendicular to the rotation axis. And a tool (5) that is controlled in synchronization with the rotation axis, and that processes the outer surface of the workpiece (1), with the U-axis having a movable range limited to a predetermined position. An X-axis that moves in a direction perpendicular to the workpiece, and a tool interference prevention device for a piston ring processing machine that cuts an inner surface and an outer surface of the work (1) to form a piston ring; ), The maximum inner diameter data that can be machined. Byte cartridge data storage means (52) for storing the byte cartridge data of the tool and the minimum inner diameter data, and the byte cartridge part number.Before starting the cutting, the processing data representing the shape of the inner and outer surfaces of the workpiece (1) to be processed is stored. A machining work data input means (53) to be inputted; and a byte cartridge data and a byte cartridge part number of a byte cartridge (6) which match the machining data inputted by the machining work data input means (53). A cartridge selecting means (54) selected from the means (52); and the U-axis machine when the compatible byte cartridge (6) is mounted based on the input processing data and the selected byte cartridge data. U-axis maximum allowable stroke from the origin (ST1), and the X-axis from the mechanical origin Axis maximum permissible stroke amount and the maximum stroke quantity calculating means for calculating a (ST2) (56), U-axis maximum permissible stroke amount the calculated (ST1) and X
U-axis and X-axis
A U-axis / X-axis interference checking means (57) for checking whether or not there is interference between the bite cartridge (6) and the tool (5) before starting cutting by simultaneously controlling the axes. Tool interference prevention device for piston ring processing machine. 2. A hollow cylindrical work (1) is supported from the direction of a cylindrical axis and rotated around the cylindrical axis to correspond to the inner diameter lengths of a plurality of different types of the works (1). The selected bite cartridge (6) is moved in a direction perpendicular to the rotation axis to cut the inner surface of the work (1), and the U-axis whose movable range is restricted to a predetermined position, and the work ( An X-axis for moving a tool (5) for machining the outer surface of (1) in a direction perpendicular to the rotation axis is controlled in synchronization with the rotation of the work (1), and the inner and outer surfaces of the work (1) are controlled. In the tool interference prevention method of the piston ring processing machine that processes the piston ring by cutting the, before starting the cutting by simultaneously controlling the U axis and the X axis,
Machining data representing the shape of the inner surface and outer surface corresponding to the workpiece (1) to be machined is input, and the maximum inner diameter data and the minimum inner diameter data that can be processed and stored in advance corresponding to a plurality of different bite cartridges (6) Byte cartridge data, and byte cartridge data and a byte cartridge part number that match the inner diameter length of the input processing data from among the byte cartridge part numbers, based on the processing data and the selected byte cartridge data, Calculate the maximum allowable U-axis stroke from the mechanical origin of the U-axis (ST1) and the maximum allowable X-axis stroke from the mechanical origin of the X-axis (ST2) when a compatible bite cartridge (6) is installed. Then, start based on the calculated maximum allowable stroke amount of the U-axis (ST1) and the maximum allowable stroke amount of the X-axis (ST2). The byte cartridge depending on whether the movement target position is within coverage area (6)
A tool interference prevention method for a piston ring processing machine, wherein the presence or absence of interference between the tool and the tool (5) is checked before starting the movement. 3. The tool interference prevention method for a piston ring processing machine according to claim 2, wherein the selected bite cartridge part number is displayed on a display (44). Method. 4. The method according to claim 3, wherein the operator replaces the bite cartridge (6) based on the part number of the bite cartridge displayed on the display (44). A tool interference prevention method for a piston ring processing machine, characterized by the following.