JPH0241845A - Working device for scroll shape - Google Patents

Abstract

PURPOSE:To execute the cutting of the work of the scroll wall face of which curvature is changed every moment with high accuracy by operating the displacement in the vertical direction orthogonal with a work rotating center line by dividing into the azimuth of the work and the relative movement in the horizontal directions of a work base and tool post and correcting and controlling the program. CONSTITUTION:In the control means 14 relatively moving a work base and tool post by approaching and separating and relatively moving in the horizontal direction orthogonal with the work rotating center line, a displacement detecting means 20 detecting the relative displacement in the vertical direction orthogonal with the work rotating center line is attached. Moreover, a correction arithmetic means 19 correcting a work program by operating the vertical deviation detected by the displacement detection means 20 by dividing it into the work azimuth and the relative movement in the horizontal direction orthogonal with the work rotation center line is assembled to the above control means 14. By this structure, the work program of the control means 14 is made to be corrected corresponding to the displacement in the vertical direction even in case of its generation on a work tool and main shaft.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention is used in compressors and the like. The present invention relates to a processing device that cuts a scroll wall surface of a scroll-shaped workpiece formed by an involute curve.

(Prior Art) In recent years, positive displacement spiral fluid machines that move fluid through swirling motion or orbital motion have been developed and put into practical use as compressors used in air conditioners and the like.

This positive displacement spiral fluid machine consists of a pair of disks (mirror-symmetrical to each other) each having a scroll-shaped wall of a predetermined height, which are offset by an angle of 180', and the spiral walls are brought into contact with each other. It rotates relative to each other while maintaining the angular relationship, resulting in smooth operation, low noise, low vibration, and
It is attracting attention because it has many excellent features such as being able to rotate at high speed and being highly efficient.

As the spiral curve forming the scroll shape, an involute curve is used for geometrical perfection.

Machining of such a scroll shape involves replacing the relational expression of the involute curve with the coordinate values of the orthogonal coordinate system, inputting these coordinate values into the NC machine tool of the X-Y coordinate system, and connecting the processing tool and the scroll part (workpiece). This can be done by relative movement of the
There is a problem in that the error in the movement trajectory of the machining tool increases in the center of the scroll component due to the servo follow-up delay of the C device, making it impossible to increase the feed rate. For this reason, for example, as disclosed in Japanese Patent Application Laid-Open No. 62-88507, the center position of the processing tool is moved on a straight line tangent to the base circle of the involute curve of the scroll component, and the center position of the processing tool is moved in synchronization with the base circle of the scroll component. A processing device that rotates and processes the involute curve with the center of the basic circle as the rotation center, makes the moving direction of the processing tool the normal direction of the involute curve, and can perform high-speed and high-precision processing. Are known.

(Problem to be Solved by the Invention) However, even if the machining accuracy is improved as described above, in reality, the assembly of the machining tool to the tool stand may be subject to displacement due to accuracy errors or damage to the work stand and tool stand. Machining accuracy may decrease due to thermal displacement of the main spindle during machining. When assembling this machining tool, displacement due to accuracy errors, thermal displacement of the spindle, etc. causes the work table and tool table to move toward and away from each other, and also to move relative to each other in the horizontal direction perpendicular to the work rotation center line. In machining equipment that uses the so-called two-axis method, when displacement occurs in the vertical direction orthogonal to the workpiece rotation center line, it is not possible to compensate for these displacements, making it impossible to ensure high machining accuracy. It was the current situation.

The present invention has been made in view of the above, and its purpose is to move a workpiece stand and a tool stand relatively toward and away from each other, and to move them relative to each other in the horizontal direction perpendicular to the workpiece rotation center line. In a two-axis machining device, by appropriately controlling the rotation of the workpiece and the relative movement of the workpiece stand and tool stand, displacement in the vertical direction perpendicular to the workpiece rotation center line can be avoided in the machining tool and spindle. Therefore, it is an object of the present invention to provide a processing device that can always accurately and reliably cut the scroll wall surface of a workpiece whose curvature changes from time to time.

(Means for Solving the Problem) In order to achieve the above object, the solving means according to claim (1) of the present invention includes a work table that rotatably supports a scroll-shaped work formed by an involute curve. , a tool stand rotatably supporting a machining tool; and a workpiece rotation center for relatively moving the work stand and tool stand toward and away from each other based on a machining program in order to cut the scroll wall surface of the workpiece with the machining tool. a scroll-shaped processing device comprising a control means for relative movement in a horizontal direction orthogonal to the line, and a displacement detection means for detecting relative displacement of the workpiece stand and tool stand in a vertical direction orthogonal to a workpiece rotation center line; will be established. Furthermore, the displacement detected by the displacement detecting means is divided into the rotation angle of the workpiece and the relative movement amount of the workpiece stand and the tool stand in the horizontal direction perpendicular to the workpiece rotation center line, calculated by 7jL, and the processing is performed. A correction calculation means for correcting the program is provided in the control means.

In this case, in claim (2), the displacement detecting means detects the correlation between the relative displacement over time in the vertical direction perpendicular to the workpiece rotation center line due to heat between the warping table and the tool stand and the machining time of the workpiece. It is composed of a displacement-time storage means that is stored in advance.

Further, in claim (3), the displacement detection means includes temperature detection means for detecting the spindle temperature of the work stand and/or the spindle temperature of the tool stand, and a temperature detection means for detecting the spindle temperature of the work stand and/or the work stand based on the spindle temperature detected by the temperature detection means. It is constructed of a displacement calculation means for calculating a relative displacement between the tool stand and the workpiece rotation center line in a vertical direction perpendicular to the rotation center line.

(Function) With the above configuration, the present invention employs a two-axis method in which the workpiece table and the tool table are relatively moved toward and away from each other based on the machining program of the control means, and are also relatively moved in the horizontal direction orthogonal to the workpiece rotation center line. As a result, the scroll wall surface of the workpiece is cut by the processing tool. When the machining tool is assembled, if there is a relative displacement between the work stand and the tool stand or in the vertical direction perpendicular to the workpiece rotation center line due to accuracy errors, this is detected by the displacement detection means. The displacement is divided into a workpiece rotation angle and a horizontal relative movement amount perpendicular to the workpiece rotation center line between the workpiece stand and the tool stand by the correction calculation means of the control means, and the machining program is corrected. be done.

In this way, even if displacement occurs in the machining tool or spindle in the vertical direction perpendicular to the work rotation center line, the machining program of the control means is corrected in accordance with this displacement, so the curvature changes from moment to moment. This allows the scroll wall surface of the workpiece to be machined with high precision and reliability at all times.

(Example) Embodiments of the present invention will be described below based on the drawings.

FIG. 3 schematically shows an apparatus main body 1 of a scroll-shaped processing apparatus according to an embodiment of the present invention. A workpiece spindle 5 is arranged rotatably by a first servo motor 6 on the workpiece table 3, and a scroll-shaped workpiece formed by an involute curve (Fig. (not shown) is rotatably supported on the work table 3 while being held on the work main shaft 5. On the other hand, on the tool stand 4, a plurality (three in the figure) of tool spindles 7, 7°7 are arranged so as to be rotatable by a second servo motor 8. A machining tool 9 for cutting the is rotatably mounted. Further, the tool stand 4 is movably supported by an X-axis table 10, and the workpiece main shaft 5 (workpiece rotation center line) is
It is designed to move in the horizontal direction perpendicular to the . Further, the X-axis table 10 is movably supported by a Z-axis table 12 fixed to the upper surface of the bed 2, and is moved in the axial direction of the workpiece spindle 5 by a fourth servo motor 13. .

In addition, the first to fourth servo motors 6.8 of the device main body 1 are provided.
11 and 13 are respectively driven and controlled based on a machining program of a control device 14 as a control means. As shown in FIG. 1, the control device 14 inputs the input data of the X-Y coordinate system in the NC language of the involute part, circular arc part, and straight part of the desired involute curve, and converts it into -cI! ii! Coordinate system N
It comprises first to third NC data conversion calculation units 15 to 17 that perform conversion calculations to C data. Further, the first to third NC data conversion calculation units 15 to 17 are connected to the second NC data unit 18,
The calculation results of the X-axis position (movement in the X-axis direction, C-axis rotation angle, and their distribution time T) of each NC data calculated in the first to third NC data conversion calculation units 15 to 17 are input to the NC data unit 18. Furthermore, the N
As a feature of the present invention, the C data section 18 is connected to one correction calculation section as correction calculation means, and the C data section 18 is connected to one correction calculation section as a correction calculation means.
A displacement detecting device 20 as a displacement detecting means for detecting the relative displacement of the work table 3 and the tool table 4 in a vertical direction orthogonal to the workpiece rotation center line is connected to. and,
The displacement detected by the displacement detection device 20 is manually input to the correction calculation section 19 to determine the rotation angle of the workpiece and the relative movement of the workpiece table 3 and tool table 4 in the horizontal direction perpendicular to the workpiece rotation center line. The X-C-T data in the NC data section 18 is corrected by dividing the data into two parts.

The details of the division calculation and correction will be explained based on FIG. Assume that it is located at a position Xo away from the rotation center of the workpiece W, as shown by a solid line on the axis. At this time, the actual machining tool 9 is displaced from the normal machining position by Δy in the vertical direction (Y-axis direction) perpendicular to the work rotation center line of the work table 3 and the tool table 4, as shown by the broken line. If so, this is detected by the displacement detection device 20, and this displacement amount Δy is calculated by one correction calculation unit into the rotation angle α of the workpiece W and the horizontal direction (X-axis direction) perpendicular to the workpiece rotation center line of the processing tool 9. ) and the movement amount β. Then, based on the divided calculation values, the normal NC data Co, ) The following calculation formula should be used to correct the position shown by the virtual line above.

X − Part 1
The X-C-T data of 8 is divided into pulses, and based on the distributed pulses, the first to fourth servo motors 6 of the device main body 1 are
．． 8, 11. Drive 13 1. By controlling the scroll wall surface of the workpiece W, the machining tool 9 cuts the scroll wall surface into a predetermined scroll shape.

Furthermore, the displacement detection device 20 can be configured in various ways as described below.

■ The accuracy error (
The displacement amount Δy) is configured by manually inputting the key in advance.

■ Work spindle 5 temperature of work stand 3 and/or tool stand 4
A temperature sensor is used as a temperature detection means to detect the temperature of the tool spindle 7 of the tool spindle 7, and based on the spindle temperature detected by the temperature sensor, the relative displacement ( and a displacement calculation device as a displacement calculation means for calculating the displacement amount Δy).

■ Constructed by combining the above ■ and ■.

■ The amount of displacement Δy due to accuracy and thermal displacement is required when assembling the processing tool 9.
It consists of a position sensor that directly measures the

■ Relative displacement over time in the vertical direction perpendicular to the work rotation center line due to heat between the work table 3 and the tool table 4 (displacement amount Δy)
and a displacement-time storage device as a displacement-time storage means in which the correlation between the processing time and the machining time of the workpiece W is stored in advance.

As described above, in this embodiment, when cutting the scroll wall surface of the scroll-shaped workpiece W formed by an involute curve with the processing tool 9, the workpiece is cut in the vertical direction perpendicular to the workpiece rotation center line of the workpiece W and the tool stand 4. The displacement detection device 20 detects the relative displacement Δy of the displacement detection device 20.
The displacement Δy detected in is manually inputted into one correction calculation unit of the control device 14, and the rotation angle α of the work W and the horizontal direction perpendicular to the work rotation center line of the work table 3 and the tool table 4 are calculated. The X-C-T data of the second part 18 of the NC data is corrected based on the calculation result.

From this, it can be determined that the machining tool 9, workpiece spindle 5, and tool spindle 7 have a displacement Δy in the vertical direction perpendicular to the workpiece rotation center line.
Even if Δy occurs, N
Based on the X-C-T data of the C-day 2 section 18, the scroll wall surface of the work whose curvature changes from moment to moment can be machined accurately and reliably.

(Effects of the Invention) As explained above, according to the present invention, the workpiece stand and the tool stand are moved relatively toward and away from each other based on the machining program of the control means, and are moved relative to each other in the horizontal direction perpendicular to the workpiece rotation center line. In a processing device that uses a processing tool to cut a scroll wall surface of a scroll-shaped workpiece formed by an involute curve using a two-axis moving method, a vertical direction perpendicular to the workpiece rotation center line between the workpiece stand and the tool stand is used. a displacement detection means for detecting a relative displacement of the workpiece, and a displacement detection means that detects the displacement detected by the displacement detection means as a rotation angle of the workpiece and an amount of relative movement in a horizontal direction perpendicular to the workpiece rotation center line between the workpiece stand and the tool stand. Since a correction calculation means is provided for correcting the machining program by performing division calculations into the parts, the scroll wall surface of the workpiece whose curvature changes from time to time can be reliably cut with high precision at all times.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a control block diagram showing a control system for a scroll-shaped processing device, and FIG.
The figure is an explanatory diagram illustrating the calculation procedure in the correction calculation section, and FIG. 3 is a perspective view of the main body of the processing apparatus. 3... Work stand, 4... Tool stand, 9... Machining tool, 14... Control device (control means), 1... Correction calculation unit (correction calculation means), 20... Displacement detection device (displacement detection means), W...Workpiece, Δy...Vertical displacement, α...Rotation angle, β...Horizontal movement amount.

Claims (3)

[Claims] (1) A work stand that rotatably supports a scroll-shaped workpiece formed by an involute curve, a tool stand that rotatably supports a processing tool, and a tool stand that rotatably supports a scroll-shaped workpiece formed by an involute curve; A scroll-shaped processing device comprising a control means for relatively moving a workpiece table and a tool table toward and away from each other based on a machining program, and for relatively moving the workpiece table and a tool table in a horizontal direction perpendicular to a rotation center line of the workpiece, displacement detection means for detecting a relative displacement in a vertical direction orthogonal to the rotation center line of the workpiece and the tool stand; A scroll-shaped machining device characterized by comprising a correction calculation means for correcting the machining program by dividing the relative movement amount between the work table and the tool table in a horizontal direction orthogonal to the work rotation center line. . (2) The displacement detection means is a displacement-time memory that stores in advance the correlation between the relative displacement over time in the vertical direction perpendicular to the workpiece rotation center line due to heat between the workpiece stand and the tool stand and the machining time of the workpiece. A scroll-shaped processing device according to claim 1, characterized in that it is comprised of means. (3) The displacement detection means includes a temperature detection means for detecting the spindle temperature of the work stand and/or the spindle temperature of the tool stand, and a work rotation between the work stand and the tool stand based on the spindle temperature detected by the temperature detection means. 2. The scroll-shaped processing device according to claim 1, further comprising a displacement calculating means for calculating a relative displacement in a vertical direction perpendicular to the center line.