JP3840389B2 - Processing method and processing apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a processing method and a processing apparatus for gripping one end of a workpiece and performing processing in a cantilevered state with the other end being a free end.
[0002]
[Prior art]
When grinding a workpiece having a cylindrical pin that is eccentric from the rotation axis at the time of machining, rotational movement around a rotation axis (hereinafter also referred to as “C axis”) around which the workpiece rotates, and C axis By accurately synchronizing the reciprocating motion of the wheel head perpendicular to the X axis direction, the eccentric cylindrical pin is ground into a highly accurate perfect circle. For example, when grinding the eccentric cylinder of the crankshaft of an air conditioner compressor, the last remaining grinding allowance of about 50 to 500 μm is ground by the above method in the finishing process for the eccentric cylinder (cylindrical pin). May be processed.
[0003]
In these eccentric cylindrical grindings, for example, a long-axis journal portion and a short short-axis journal portion that are long in the axial direction are arranged on the same line, and the workpiece has an eccentric cylindrical portion between these journal portions. When grinding this workpiece, the long-axis journal part is held in a cantilever manner using a chuck having a gripping standard such as a V-block, the short-axis journal part is used as a free end, and the chuck is moved around the C-axis. It was rotated and ground.
[0004]
[Problems to be solved by the invention]
In such a grinding process, the short end on the free end side, which is processed coaxially with the long axis journal part as a reference, is affected by the release of stress due to the machining of the eccentric cylindrical part in the preceding process. The shaft journal may swing. That is, an error occurs in the coaxiality between the long axis journal part and the short axis journal part.
[0005]
Therefore, in order to prevent the short-axis journal portion from wobbling, it is conceivable to limit the machining conditions of the eccentric cylindrical portion so as not to apply a load or to devise heat treatment of the material so as to prevent stress release. . In addition, when the short shaft portion is swung, a means for providing a process for performing another correction process can be considered.
[0006]
However, if the processing conditions are limited as described above, the processing time becomes long and the productivity decreases. Further, when a separate process for correcting the shake is provided, there are problems such as an increase in system cost and manufacturing cost.
[0007]
The present invention has been made to solve the above-described problems, and its object is to maintain the coaxiality of the support end side and the free end side even when a workpiece is processed by cantilever support. The object is to provide a processing method and a processing apparatus which can be performed with high accuracy in a cost or in a short time.
[0008]
[Means for Solving the Problems]
Means for solving the above problems are as follows.
[0009]
According to the first aspect of the present invention, the machining is performed in a state where the fixed end portion of the workpiece having the main processing portion between the fixed end portion gripped by the main shaft and the free end portion not gripped is cantilevered. A method for detecting an eccentric amount from a rotation center of the main shaft to a central axis of the workpiece, creating profile data for processing the free end portion based on the eccentric amount, and Is a processing method for processing the free end portion based on the profile data.
[0010]
According to the processing method of the first aspect, even if a swing occurs on the free end side during the processing of the main processing portion, the free end portion can be corrected by the profile data based on the amount of eccentricity.
[0011]
  The means of claim 2A machining method in which machining is performed in a state where the fixed end portion of a workpiece having a main machining portion between a fixed end portion gripped by a main shaft and a free end portion not gripped is cantilevered, and the main shaft The amount of eccentricity from the rotation center of the workpiece to the center axis of the workpiece is detected, whether or not the free end portion is shaken when the main machining portion is machined is detected, and the free end portion is more than a predetermined value If the runout occurs, profile data for processing the free end portion is created based on the amount of eccentricity, the free end portion is processed based on the profile data, and a predetermined value is applied to the free end portion. A machining method in which the free end is not machined when the above deflection does not occurIt is.
[0012]
  The processing method of claim 2 is:The free end is corrected only when the free end is shaken more than a predetermined value.
[0013]
  The means of claim 3 is the processing method of claim 1 or 2,The amount of eccentricity is a distance from the center of rotation of the main shaft to the center axis of the fixed end portion.
[0014]
  The processing method of claim 3 is:The free end portion can be corrected based on the gripped fixed end side. Therefore, the accuracy of the coaxiality between the fixed end and the free end is increased.
[0015]
  According to a fourth aspect of the present invention, the machining is performed in a state where the fixed end portion of the workpiece having the main processing portion between the fixed end portion gripped by the main shaft and the free end portion not gripped is cantilevered. In the apparatus, an angle detector that detects a rotation angle of the main shaft, a position detector that detects a positional relationship between the main shaft and the workpiece, and a rotation center of the main shaft at an angular position detected by the angle detector. Eccentricity detecting means for obtaining the amount of eccentricity to the center axis of the workpiece based on the detection result from the position detector, and a profile for machining the free end portion based on the detection result of the eccentricity detecting means Profile data creation means for creating data, main processing portion processing means for processing the main processing portion,Based on the profile dataA processing apparatus comprising: free end processing means for processing the free end.
[0016]
In the machining apparatus according to claim 4, the eccentricity detection means obtains the eccentricity from the rotation center of the main shaft to the central axis of the workpiece at the angular position detected by the angle detector based on the detection result from the position detector. . Based on the amount of eccentricity, profile data for processing the free end is created by profile data creation means. When the main processing portion is processed by the main processing portion processing means, the free end portion is corrected by the free end processing means based on the created profile data. Therefore, even if a vibration occurs on the free end side during processing of the main processing portion, the free end portion can be corrected by the profile data based on the amount of eccentricity.
[0017]
  The means of claim 5Rotation of the spindle in a machining apparatus that performs machining in a state where the fixed end of a workpiece having a main machining portion is cantilevered between a fixed end that is gripped by the spindle and a free end that is not gripped. An angle detector that detects an angle, a position detector that detects a positional relationship between the main shaft and the workpiece, and a rotation center of the main shaft at an angular position detected by the angle detector to a central axis of the workpiece Eccentricity detection means for obtaining the amount of eccentricity based on the detection result from the position detector, and profile data creation for creating profile data for processing the free end based on the detection result of the eccentricity detection means And a main machining part machining means for machining the main machining part, and detecting whether or not the free end portion is shaken over a predetermined value when the main machining part is machined by the main machining part machining means. You When it is detected by the shake determining means and the shake determining means that a shake of a predetermined value or more has occurred at the free end, the free end is processed based on the profile data, and the shake of a predetermined value or more is detected. A processing apparatus comprising: free end processing means that does not process the free end when it does not detect the occurrenceIt is.
[0018]
  The processing device according to claim 5 is:When the main processing portion is processed by the shake discriminating means, it is detected whether or not the free end portion has a predetermined value or more, and the correction of the free end portion is performed only when the predetermined value or more has occurred.
[0019]
  The means of claim 6 is the processing apparatus of claim 4 or claim 5, whereinThe eccentricity detecting means detects a distance from a rotation center of the main shaft to a central axis of the fixed end portion.Is.
[0020]
  The processing apparatus according to claim 6 is:The eccentric amount on the fixed end side gripped by the eccentric amount detecting means is detected, and the correction processing of the free end can be performed based on this. Therefore, the accuracy of the coaxiality between the fixed end and the free end is increased.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described based on specific examples.
[0022]
FIG. 1 is a hardware configuration diagram of a grinding machine 100 (processing apparatus) according to the present embodiment. FIG. 2 shows a workpiece W that is ground by the grinding machine 100.
[0023]
The workpiece W is a cylindrical member, and a long-axis journal portion A (fixed end portion) long in the axial direction and a short short-axis journal portion B (free end portion) are arranged on the same line. B has eccentric cylindrical portions Wb1 and Wb2 (main processing portions). The center lines of the eccentric cylindrical portions Wb1 and Wb2 are displaced from the central axes of the journal portions A and B by a predetermined amount, respectively. Here, the radii of the long axis journal part A and the short axis journal part B are the same. The long-axis journal portion A is a portion that is gripped by a main shaft 31 described later, and the workpiece W is supported and ground by using the short-axis journal portion B as a free end.
[0024]
The eccentric cylindrical portions Wb1 and Wb2 are portions that are ground by a known grinding method using the grinding machine 100 as in the conventional case. The concentricity of the central axis of the long-axis journal portion A and the short short-axis journal portion B is maintained with high accuracy at the stage of the previous process that is carried into the grinding machine 100. The grinding machine 100 of the present embodiment maintains the concentricity of the journal parts A and B even after grinding by modifying the short axis journal part B after machining the eccentric cylindrical parts Wb1 and Wb2.
[0025]
1, the coordinate system of the grinding machine 100 uses a right-handed orthogonal coordinate system in which the upward direction in the vertical direction is a positive direction in the y-axis direction on the paper surface of FIG. Therefore, the xz plane is a horizontal plane.
[0026]
On a bed 36 of the grinding machine 100 installed on a horizontal floor surface, a grindstone table (hereinafter referred to as a table) 40 that moves in the Z-axis direction by driving the motor 24 is provided. The amount of rotation of the motor 24 is detected by the encoder 22.
[0027]
On the table 40, a grindstone table 48 that moves in the X-axis direction by driving a motor 54 is provided. The amount of rotation of the motor 54 is detected by the encoder 52. A grinding wheel head 44 is provided on the front surface of the grinding wheel base 48, and a disk-shaped grinding wheel 46 (tool) provided on the grinding wheel shaft head 44 is rotated by driving a motor 50.
[0028]
A headstock 30 having a main shaft 31 is provided at a position facing the table 40 on the bed 36. A chuck 32 is provided at the tip of the main shaft 31 so that the workpiece W can be rotatably mounted with the center of the main shaft as a rotation axis (C axis). The main shaft 31 rotates the workpiece W via the chuck 32 by driving the motor 28. The rotation amount of the motor 28 is detected by an encoder 26 (angle detector).
[0029]
A sizing device 70 (position detector) is provided near the chuck 32 on the bed 36. The sizing device 70 is moved in the X-axis direction and the Z-axis direction by a drive device (not shown), and is used for measuring each part of the workpiece W.
[0030]
The numerical controller 10 includes a memory 1 (storage means), a CPU 2 (calculation means), and interfaces (I / F) 3 and 4. The I / F 3 mediates data transmission / reception between the CPU 2 and the input / output device 12 including a keyboard and a display.
[0031]
The I / F 4 mediates data transmission / reception with a PLC (programmable logic controller) 14, an amplifier 16, a grindstone head moving motor driving circuit 18, a table moving motor driving circuit 19, and a spindle motor driving circuit 20. The PLC 14 controls the sizing device 70. The amplifier 16 amplifies the output of the sizing device 70 and performs A / D conversion.
[0032]
The wheel head moving motor drive circuit 18, the table moving motor drive circuit 19, and the spindle motor drive circuit 20 amplify or servo-control each drive signal of the X axis, Z axis, and C axis (rotary axis). These drive circuits may be constituted by a servo control device incorporating a CPU.
[0033]
In this way, the grinding machine 100 is configured, and the rotational movement around the C axis (main axis) and the reciprocating movement of the grindstone table in the X axis direction perpendicular to the C axis are accurately synchronized, so that the workpiece W Grinding is performed.
[0034]
3 and 4 are sectional views of the chuck 32 of the present embodiment on the XY plane and on the XZ plane. A substantially U-shaped bracket 61 is attached to the chuck 32 supported by the end surface of the main shaft 31 via a face plate 32a, and a V block 62 is connected in series in the Z-axis direction to the recess 61a of the bracket 61. Two are mounted side by side. The sandwiching angle of the gripping reference surfaces 62a of the V block 62 facing each other is α (radian) (see FIG. 6). A block 62b that contacts the end of the workpiece W and performs positioning in the Z-axis direction is attached to the spindle 31 side of the V block 62.
[0035]
On the side of the V block 62, an L-shaped clamp arm 64 that is rotatably supported by a pivot pin 63 is attached. A cylinder rod 66 of the cylinder 65 is attached to one end of the clamp arm 64 by a cylinder 66 a through a long hole 67, and the cylinder rod 66 is fixed to a piston 68.
[0036]
At the other end of the clamp arm 64, a clamp block 69 having an abutting surface 69 a that abuts the workpiece W so as to face the V block 62 is provided.
[0037]
In the above configuration, when the cylinder 65 is operated (rightward in FIG. 3), the clamp arm 64 is rotated counterclockwise around the pivot pin 63,
The clamp block 69 presses and grips the workpiece W against the gripping reference surface 62a of the V block, and rotates the workpiece W around the rotation axis C together with the main shaft.
[0038]
FIG. 5 shows a cross-sectional view of the sizing device 70 on the XY plane. The sizing device 70 performs a sizing operation using a differential transformer mechanism, and is supported on the bed 36 so as to be able to advance and retreat in the X-axis or Z-axis direction by a drive device (not shown). Reference numeral 71 denotes a main body of the sizing device 70, and a U-shaped support member 71a is integrally supported therein.
[0039]
The block 75 is supported by the pilot bar 77 via the linear motion bearing 76 so that the support member 71a can move up and down. A connecting shaft 78 is supported at a lower portion of the block 75 through the support member 71a and the main body 71, and a feeler 80 having a positioning surface 79 that contacts a positioning point of the workpiece W is supported on the connecting shaft 78. It is fixed.
[0040]
When measuring the workpiece W, the feeler 80 is positioned in the X-axis direction so that the positioning point that rotates around the C-axis (the highest point P of the workpiece W to be measured) does not deviate from the positioning surface 79. Widely formed.
[0041]
A connecting rod 82 is loosely fitted in the approximate center of the block 75 through a through hole 81, and a flange 83 is formed at the lower end of the connecting rod 82. The upper end of the connecting rod 82 is connected to a piston 84 in an air cylinder 72 provided on the upper portion of the main body 71.
[0042]
A difference between the block 75 and the support member 71a is provided with a core 74a made of a magnetic material supported by the block 75 and a differential coil 74b fixed to the support member 71a so as to surround the outer periphery of the core 74a. A moving transformer 74 is provided.
[0043]
The sizing device 70 has a height of the highest point P from the C-axis of the long-axis journal portion A or the like (FIG. 5) due to relative displacement between the core 74a and the differential coil 74b based on these configurations (differential transformer mechanism). 6), the height Y of the long-axis journal A can be detected. That is, the sizing device 70 has a height Y of the highest point P from the C axis of the reference workpiece.₀Therefore, the height of the uppermost point P of the workpiece W is detected by detecting the displacement of the height of the actual workpiece W and the reference workpiece as the amount of vertical movement of the feeler 80. be able to.
[0044]
If the sizing device 70 is further provided with a lower feeler 85 (broken line portion in FIG. 5), the sizing device 70 can measure the diameter of the cylinder.
[0045]
The operation of the embodiment will be described based on the above configuration.
[0046]
FIG. 6 shows the central axis O of the long journal A_A6 is a cross-sectional view of a long-axis journal A and a V block 62 showing a method for obtaining a height (eccentricity) ε from a point C (C-axis) of FIG. Center axis O of long axis journal A_A Although the point C and the point C are actually very close to each other, the position of the point C is exaggerated for easy understanding in FIG.
[0047]
Here, the distance from the point C to the reference point G of the V block 62 is d, the radius of the long-axis journal A is D, and the sandwiching angle of the gripping reference surface 62a is α. At this time, as shown in FIG. 6, if the height Y of the long axis journal A from the point C is measured by the sizing device 70, the central axis O of the long axis journal A from the C axis which is the center of rotation of the workpiece W._AThe eccentricity ε up to can be obtained as in the following equation (1).
[0048]
ε = Y−D = (Y−d) / {1 + sin (α / 2)} + d (1)
Note that d is not necessarily an integer, and this value depends on the specific configuration of the chuck 60. For example, if the point C is designed to coincide with the reference point G of the V block 62, “d = 0” is obtained at this time, and the expression (1) is simplified. Further, for example, the center point O when the reference journal M of the reference workpiece is held by the V block 62._MIf the point C is arranged so that the (center axis) and the point C (C axis) coincide with each other, then “d = − | GO_M| = -D₀/ Sin (α / 2) ”. Where D₀Is the radius of the reference journal M. Therefore, at this time, ΔD≡ (DD₀), Ε = ΔD / sin (α / 2), and can be written more simply than equation (1). In this case, it is necessary to measure not the height Y of the long axis journal A but the radius D of the long axis journal A with the sizing device 70.
[0049]
Based on the amount of eccentricity ε from the C axis of the long-axis journal portion A obtained as described above, grinding data for the short-axis journal portion B is created, and grinding is performed so as to remove runout of the short-axis journal portion B The method is illustrated below.
[0050]
FIG. 7 is a flowchart showing a procedure for creating grinding data of the short-axis journal portion B in the present embodiment. This flowchart is executed by the numerical controller 10 of FIG.
[0051]
First, in step 710, the center line L (see FIG. 6) of the V block 62 is made coincident with the Y axis, and the rotation angle θ of the main shaft 31 (C axis) is initialized to zero. For example, the rotation angle θ is an angle measured counterclockwise from the positive direction in the X-axis direction.
[0052]
In step 715, the workpiece W is carried in, the outer peripheral surface of the long-axis journal portion A is brought into contact with the grip reference surface 62 a of the V block 62, and is gripped and fixed by the clamp arm 64.
[0053]
In step 720, the sizing device 70 is moved forward by a predetermined amount, thereby positioning the positioning surface 79 of the sizing device 70 on the upper part of the long-axis journal portion A and preparing for measurement (see the solid line in FIG. 2).
[0054]
In step 725, the sizing device 70 measures the height Y of the long-axis journal portion A from the C-axis.
[0055]
In step 730, the center O of the long-axis journal portion A is calculated from Y measured in step 725 and the above equation (1)._AThe amount of eccentricity ε from the C axis is obtained. As described above, in step 710, the rotation angle θ of the main shaft 31 (C axis) is initialized. Accordingly, the eccentricity ε and the rotation angle θ are stored in correspondence with each other (eccentricity detecting means).
[0056]
In step 735, the turning radius D of the grindstone 46._GEnter. The turning radius D of the grindstone 46_GIs usually obtained by calculation from predetermined measurement data or the like, but can also be input from the input / output device 12.
[0057]
In step 740, the center O of the long-axis journal part A obtained in the above steps._AEccentricity ε from the C-axis, turning radius D of the grindstone 46_GThen, grinding data (CX profile data) of the short-axis journal part B is created from the radius D of the short-axis journal part B (same as the radius of the long-axis journal part A), etc. (profile data creation means). This data creation method is known, and calculates the relationship of the feed amount X of the grindstone 46 to the rotation angle θ of the main shaft 31 (C axis). That is, as shown in FIG. 8, the relationship between the rotation angle θ and the feed amount X is that the eccentric amount ε and the rotation radius D of the grindstone 46._GFrom the radius D of the short axis journal part B, it can be calculated geometrically. Therefore, one rotation of the main shaft 31 (C axis) is divided by the division number N, and feed amounts X (0) to X (N) corresponding to the rotation angles θ (0) to θ (N) are calculated. C-X profile data is used.
[0058]
In step 745, grinding of the eccentric cylindrical portions Wb1 and Wb2 is sequentially performed based on the pre-stored profile data of the eccentric cylindrical portions Wb1 and Wb2 (main processing portion processing means). The grinding of the eccentric cylindrical portions Wb1 and Wb2 is performed by a known method and is not particularly limited.
[0059]
In step 750, the grindstone base 48 is positioned so that the grindstone 46 faces the short-axis journal portion B. Then, the runout of the short-axis journal portion B is corrected by CX synchronous grinding based on the profile data calculated in step 740 (free end machining means).
[0060]
When the eccentric cylindrical portions Wb1 and Wb2 are ground in step 745, if the short-axis journal portion B is not shaken, the center O of the short-axis journal portion B is determined._B Is the center O of the long-axis journal part A_AThe amount of eccentricity from the C axis is ε. However, there is a change in the concentricity of both journal portions due to run-out during grinding of the eccentric cylindrical portions Wb1 and Wb2. Therefore, by grinding the short-axis journal portion B with the profile data calculated in step 740, the runout is removed by grinding, and the center O of the short-axis journal portion B is removed._B Is the center O of the long-axis journal part A_AMatches. That is, the center O of the short-axis journal part B_BThe amount of eccentricity from the C axis is corrected to be ε.
[0061]
If the above procedure is followed, the shake of the short-axis journal part B can be corrected with high accuracy. Further, once the long-axis journal portion A is gripped by the V block 62 according to the procedure of this embodiment, it is not necessary to grip the workpiece again. Thereby, processing time can be shortened and productivity improves.
[0062]
In addition, it is not necessary to provide a separate process for correcting shake, and the cost of the entire system can be kept low.
[0063]
FIG. 9 is a flowchart showing another embodiment. In the embodiment of FIG. 7, the correction grinding of the short-axis journal portion B is performed every time. However, in the embodiment shown in FIG. 9, the correction grinding is executed only when the deflection of the short-axis journal portion B is a predetermined value or more.
[0064]
Steps 810 to 830 shown in FIG. 9 are the same as steps 710 to 730 of FIG.
[0065]
In step 835, the sizing device 70 is moved in the Z-axis direction by an unillustrated drive device, and the positioning surface 79 is positioned in the short-axis journal portion B (see the broken line in FIG. 2).
[0066]
In step 840, similarly to step 745 of FIG. 7, based on the pre-stored profile data of the eccentric cylindrical portions Wb1 and Wb2, the eccentric cylindrical portions Wb1 and Wb2 are ground sequentially. At this time, the displacement amount of the short-axis journal portion B rotated by the sizing device 70 is measured and stored in real time.
[0067]
After the grinding of the eccentric cylindrical portions Wb1 and Wb2 is completed, it is determined in step 845 whether or not the short-axis journal portion B has a deflection within a predetermined value (a deflection determination unit). If an excessive load is not acting on the workpiece W during grinding of the eccentric cylindrical portions Wb1 and Wb2, and if the short-axis journal portion B has a small runout, the center O of the short-axis journal portion B will be described._BThe amount of eccentricity from the C-axis is the center O of the long-axis journal portion A obtained in step 830._AIs substantially equal to the amount of eccentricity ε from the C axis, and the difference is within a predetermined value. That is, if the short-axis journal portion B has a shake within a predetermined value (Yes), an excessive shake has not occurred, and the entire process ends. On the other hand, if the runout of the short axis journal B is larger than the predetermined value (No), the process proceeds to step 850 to perform correction grinding on the short axis journal B.
[0068]
Steps 850, 855, and 860 for creating the profile data of the short-axis journal portion B and performing the correction grinding are substantially the same as steps 735, 740, and 750 in FIG.
[0069]
Only when it is necessary to correct grinding of the short axis journal B, the profile data of the short axis journal B is created and corrective grinding is performed, so unnecessary correction can be eliminated, and high-precision grinding and production are possible. It is possible to simultaneously improve the property.
[0070]
In the embodiment described above, the center O of the long-axis journal portion A that is gripped by the headstock 30 and serves as a reference._AThe amount of eccentricity ε from the C-axis is obtained, and based on this, the short-end journal part B side on the free end side is corrected and ground. However, before machining the eccentric cylindrical portions Wb1, Wb, the center O of the short-axis journal portion B is set._BAlternatively, the amount of eccentricity from the C-axis may be obtained, and the profile data of the short-axis journal B for correction grinding may be created based on this value.
[0071]
In the above embodiment, the sizing device 70 of the grinding machine 100 uses a differential transformer mechanism, but the specific configuration of the grinding machine, such as the measurement principle and control method of these sizing devices, is particularly the above implementation. It is not limited to examples. That is, the grinding machine may be configured by arbitrarily combining known sizing devices, sensors, and the like different from the above-described embodiments.
[0072]
For example, in the above-described embodiment, the eccentric amount ε of the central axis of the long-axis journal portion A is obtained from the equation (1) by the three-point contact chuck 32 using the V block 62. There is no need to use a three-point contact method.
[0073]
Instead of the sizing device, a non-contact type sensor S1 can be provided in the vicinity of the long-axis journal portion A as shown in FIG. For example, after storing the output of the sensor S1 and the rotation angle of the main shaft (C axis) when the workpiece W is rotated once, the eccentric amount ε is calculated from the maximum value and the minimum value of the output from the sensor S1. The method of doing etc. can be considered.
[0074]
Further, a non-contact type sensor S2 can be provided in the vicinity of the short axis journal part B in order to obtain the deflection or eccentricity of the short axis journal part B as in the second embodiment.
[0075]
In the embodiment described above, the machining locations between the journal portions A and B are the eccentric cylindrical portions Wb1 and Wb2 displaced from the central axes of the journal portions A and B. However, the machining location is not limited to an eccentric one, and is not particularly limited, such as a cylindrical portion or a cam shape coaxial with the journal portions A and B.
[0076]
Furthermore, the processing apparatus of the present embodiment is not limited to a grinding machine, and can also be used for a lathe or the like that processes a workpiece by cantilevering it.
[0077]
【The invention's effect】
As described above, the invention of claim 1 or claim 4 creates profile data for machining the free end by detecting the amount of eccentricity of the workpiece, and machining the free end based on the profile data. I tried to do it. For this reason, even if a vibration occurs on the free end side during the processing of the main processing portion, the processing accuracy can be improved by processing the free end portion. Further, it is not necessary to re-grip the workpiece when shifting from the processing of the main processing portion to the processing of the free end portion. Therefore, the accuracy is improved, the processing time can be shortened, and the productivity is improved.
[0078]
In addition, it is not necessary to provide a separate process for correcting shake, and the cost of the entire system can be kept low.
[0079]
  The invention of claim 2 or claim 5The free end is corrected only when the free end is shaken more than a predetermined value. Accordingly, the machining is executed when correction is necessary, and is not performed when unnecessary, so that both machining accuracy and productivity are improved.
[0080]
  The invention of claim 3 or claim 6Since the free end is processed with the fixed end held by the main shaft as a reference, the accuracy of coaxiality between the fixed end and the free end is further improved.
[Brief description of the drawings]
FIG. 1 is an overall configuration diagram of a grinding machine according to an embodiment of the present invention.
FIG. 2 is an external view of a workpiece in the embodiment of the present invention.
FIG. 3 is an XY plan view of a chuck according to the embodiment of the present invention.
FIG. 4 is an XZ plan view of the chuck according to the embodiment of the present invention.
FIG. 5 is an XY plan view of the sizing device in the embodiment of the present invention.
FIG. 6 is a diagram illustrating a method of obtaining an eccentricity amount ε in the embodiment of the present invention.
FIG. 7 is a flowchart illustrating the operation of the exemplary embodiment of the present invention.
FIG. 8 is a diagram for explaining a method of creating profile data of a short-axis journal part B in an embodiment of the present invention.
FIG. 9 is a flowchart illustrating the operation of the second exemplary embodiment of the present invention.
FIG. 10 is a diagram for explaining another modification of the present invention.
[Explanation of symbols]
10 Numerical controller
26 Encoder
70 Sizing device
100 grinding machine
A Long axis journal
B Short axis journal
S1, S2 sensor
W Workpiece
Wb1, Wb2 Eccentric cylindrical part

Claims (6)

A processing method for performing processing in a state where the fixed end portion of a workpiece having a main processing portion between a fixed end portion gripped by a main shaft and a free end portion not gripped is cantilevered,
Detecting the amount of eccentricity from the center of rotation of the spindle to the center axis of the workpiece;
Create profile data for processing the free end based on the amount of eccentricity,
A processing method of processing the free end portion based on the profile data after processing the main processing portion. A processing method for performing processing in a state where the fixed end portion of a workpiece having a main processing portion between a fixed end portion gripped by a main shaft and a free end portion not gripped is cantilevered,
Detecting the amount of eccentricity from the center of rotation of the spindle to the center axis of the workpiece;
Detecting whether or not the free end has shaken when processing the main processing portion,
When the free end is shaken more than a predetermined value, profile data for processing the free end is created based on the amount of eccentricity, and the free end is processed based on the profile data. A processing method in which the free end portion is not processed when the free end portion does not shake more than a predetermined value . The processing method according to claim 1 , wherein the amount of eccentricity is a distance from a rotation center of the main shaft to a central axis of the fixed end portion . In a processing apparatus that performs processing while cantilevering the fixed end of a workpiece having a main processing portion between a fixed end gripped by a main shaft and a free end not gripped,
An angle detector for detecting the rotation angle of the spindle;
A position detector for detecting a positional relationship between the spindle and the workpiece;
Eccentricity detection means for obtaining an eccentricity from the rotation center of the main shaft to the central axis of the workpiece at an angular position detected by the angle detector based on a detection result from the position detector;
Profile data creating means for creating profile data for processing the free end based on the detection result of the eccentricity detecting means,
A main processing portion processing means for processing the main processing portion;
A processing device comprising: free end processing means for processing the free end based on the profile data . In a processing apparatus that performs processing while cantilevering the fixed end of a workpiece having a main processing portion between a fixed end gripped by a main shaft and a free end not gripped,
An angle detector for detecting the rotation angle of the spindle;
A position detector for detecting a positional relationship between the spindle and the workpiece;
Eccentricity detection means for obtaining an eccentricity from the rotation center of the main shaft to the central axis of the workpiece at an angular position detected by the angle detector based on a detection result from the position detector;
Profile data creating means for creating profile data for processing the free end based on the detection result of the eccentricity detecting means,
A main processing portion processing means for processing the main processing portion;
A shake discriminating means for detecting whether or not a shake of a predetermined value or more has occurred in the free end when the main machining portion is machined by the main machining portion machining means;
When it is detected by the shake discriminating means that a shake of a predetermined value or more has occurred at the free end, the free end is processed based on the profile data to detect that a shake of a predetermined value or more has occurred. If not, free end machining means not machining the free end
A processing apparatus comprising: The machining apparatus according to claim 4, wherein the eccentricity detection unit detects a distance from a rotation center of the main shaft to a central axis of the fixed end portion .

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