JP2004188560A - Cam grinding machine, and cam grinding method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cam grinding machine, and a cam grinding method, capable of grinding a cam of a shape having a recessed part like a gourd through a plurality of grinding processes to efficiently grind it in short grinding time. <P>SOLUTION: A plurality of sets of profile data at least including basic profile data equivalent to basic cam form, and final profile data equivalent to final cam form are preliminarily stored in a RAM 33 in a control device 19. As the grinding processes to a workpiece proceed, the plurality of sets of profile data from the basic profile data to the final profile data are read in order from the RAM 33 by control of a CPU 31 in the control device 19, and grinding actions are executed in stages based on the data. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a cam grinding machine and a cam grinding method for grinding the outer periphery of a work into a predetermined cam shape.
[0002]
[Prior art]
Conventionally, with the rotating grindstone in contact with the outer periphery of the work mounted on the spindle, the rotating grindstone is moved relatively to the direction perpendicular to the axis of the spindle while rotating them, and the outer periphery of the work is ground into a non-circular shape. For example, a cam grinder for grinding a cam in a vehicle engine is known as an apparatus for performing the above.
[0003]
In this type of cam grinder, the positional relationship between the rotation indexing angle of the spindle supporting the work and the moving position of the rotating grindstone is set, and the only profile data representing the final finished shape of the work is set in advance by a numerical controller. (Hereinafter, simply referred to as a control device). Then, based on the profile data, the control device controls the moving position of the rotary grindstone in accordance with the rotation index angle of the spindle, and the outer periphery of the workpiece is ground into a predetermined cam shape corresponding to the profile data. ing.
[0004]
Also, in this type of cam grinder, the workpiece is subjected to a plurality of grinding processes such as rough grinding → medium finish grinding → finish grinding → spark-out so that the outer periphery of the workpiece approaches the desired cam shape in order. Grinding is performed while the cutting amount (grinding allowance) on the outer periphery of the workpiece is sequentially reduced.
[0005]
[Problems to be solved by the invention]
By the way, as shown in FIG. 9B, a general cam 41 used for a vehicle engine includes a base circle portion 41a, a lift portion 41b extending from both sides of the base circle portion 41a, and a space between the lift portions 41b. And a cam top portion 41c that connects the two. The two lift portions 41b are almost indistinguishable, but have a slightly bulging convex shape.
[0006]
On the other hand, in recent years, due to demands for improvement of fuel efficiency and emission, etc., as shown by a solid line in FIG. 9A, both lift portions 41b are concave so that the cam shape of the entire cam 41 is substantially gourd-shaped. In some cases. In this way, the concave portions are located before and after the base circular portion 41a, and the valve (not shown) whose operation is controlled by the cam 41 increases the operating speed halfway between the open state and the closed state. As a result, it is possible to improve the output of the engine and the fuel efficiency.
[0007]
In this specification, the cams shown in FIGS. 9 (a) and 9 (b) and other drawings are exaggerated in shape and elongated in overall shape for easy understanding.
On the other hand, the cam is ground based on the profile data. However, in the case of the gourd-shaped cam, the cut amount is further increased in the concave lift portions 41b, and the acceleration / deceleration time constant is too high. For this reason, it is necessary to perform the grinding by setting the rotation speed of the main shaft to be extremely slow as compared with FIG. 9B, and there is a problem that the grinding efficiency is reduced.
[0008]
In order to cope with such a problem, for example, profile data is reset during processing, and a plurality of grinding processes are executed by one cam grinder, or each cam grinder is used by using a plurality of cam grinders. A grinding method in which the grinding process is performed based on different profile data is also conceivable.
[0009]
That is, in the first grinding method described above, a single cam grinder is used to first set a predetermined number of workpieces such as rough grinding with a large cutting depth in a state where profile data corresponding to an oval cam shape is set. Execute for Thereafter, the profile data is reset to data corresponding to a gourd-shaped cam shape, and grinding such as finish grinding with a relatively small depth of cut is performed on a predetermined number of workpieces.
[0010]
In the second grinding method, different data such as profile data corresponding to an egg-shaped cam shape and profile data corresponding to a gourd-shaped cam shape are preset in a plurality of cam grinders. . Then, using each cam grinder, the work is sequentially conveyed to each cam grinder, and a plurality of grinding steps are sequentially performed on a predetermined number of works.
[0011]
However, in the first grinding method, it is necessary to reset the profile data between the grinding steps, so it is necessary to temporarily stop the grinding operation, and there is a problem that the operation is troublesome and the grinding efficiency is reduced. . Further, in the second grinding method, it is necessary to use a plurality of cam grinders, and it is necessary to transport the work between the cam grinders, so that the grinding efficiency is reduced and the equipment cost is high. There was a problem of becoming.
[0012]
The present invention has been made by paying attention to the problems existing in such a conventional technique. An object of the present invention is to provide a cam grinding machine and a cam grinding method capable of efficiently grinding a cam having a concave portion in a lift portion through a plurality of grinding steps in a short time.
[0013]
[Means for Solving the Problems]
In order to achieve the above object, an invention according to claim 1 is a cam grinding machine for grinding an outer periphery of a work into a predetermined cam shape by a plurality of grinding steps, wherein a basic profile data corresponding to at least a basic cam shape is provided. Storage means for storing a plurality of profile data including final profile data corresponding to the final cam shape, and a plurality of profile data from basic profile data to final profile data are sequentially read from the storage means as the grinding process proceeds. And control means for causing the grinding operation to be performed stepwise based on the data.
[0014]
Therefore, according to the first aspect of the present invention, a plurality of data from the basic profile data stored in advance to the final profile data are sequentially read out as the plurality of grinding steps progress, and based on the data. The grinding operation is performed automatically. Therefore, it is possible to omit the trouble of resetting the profile data and transporting the work between a plurality of grinding machines, and it is not necessary to prepare a plurality of grinding machines having different profile data. Therefore, for example, a cam having a concave portion in the lift portion can be efficiently ground through a plurality of predetermined grinding steps, and can be ground at low equipment cost.
[0015]
According to a second aspect of the present invention, in the first aspect, the basic profile data is data corresponding to a basic cam shape having a base circle portion, a lift portion, and a cam top portion, and the final profile data is The data is data corresponding to a final cam shape in which the lift portion is concave.
[0016]
Therefore, the invention according to the second aspect is effective when grinding a gourd-shaped cam having concave portions in the lift portions on both sides, such as a cam in a vehicle engine.
[0017]
According to a third aspect of the present invention, there is provided a cam grinding method for grinding an outer periphery of a workpiece into a predetermined cam shape by a plurality of grinding steps, wherein at least basic profile data corresponding to the basic cam shape and final profile data corresponding to the final cam shape. A plurality of profile data including profile data is stored in advance, and a plurality of profile data from the basic profile data to the final profile data are sequentially read out according to the progress of the grinding process, and the grinding operation is performed stepwise based on the data. It is characterized in that it is performed.
[0018]
Therefore, according to the invention described in claim 3, it is possible to obtain the same operation as the operation described in claim 1.
According to a fourth aspect of the present invention, in the third aspect, a basic cam shape having a base circle portion, a lift portion, and a cam top portion is ground based on the basic profile data, and the lift is performed based on final profile data. It is characterized in that a final cam shape having a concave portion is ground.
[0019]
Therefore, according to the invention described in claim 4, the same operation as the operation described in claim 2 can be obtained.
[0020]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described below with reference to FIGS.
As shown in FIGS. 1 and 2, a work support table 12 is supported on a base 11 of the cam grinder by a moving mechanism (not shown) so as to be able to reciprocate in the Z direction. A headstock 13 is disposed and fixed on the work support 12, and includes a spindle 14 and a spindle motor 15 for rotating the spindle 14. A holder 16 is provided on the work support base 12 so as to adjust the distance between the holder 16 and the main shaft 14, and includes a support shaft 17 positioned on the axis of the holder 16 so as to face the main shaft 14.
[0021]
The work W is detachably mounted between the main shaft 14 of the headstock 13 and the support shaft 17 of the holder 16 such that the axis extends along the Z direction which is the moving direction of the work support 12. A plurality of parts to be ground Wa are formed on the work W at predetermined intervals in the axial direction. In this embodiment, the workpiece W is a camshaft, and the portion to be ground Wa becomes a cam by being subjected to grinding. Then, by rotating the spindle motor 15 in the mounted state of the work W, the work W is rotated counterclockwise in FIG. 1 about its own axis. The rotation of the spindle motor 15 is detected by the encoder 18 as the rotation index angle of the spindle 14, and the detection data is output to the control device 19.
[0022]
A grindstone table 20 is provided on the base 11 so as to be able to reciprocate in an X direction orthogonal to the axial direction Z of the workpiece W, and is moved by a moving motor 21 via a ball screw 22. The rotation of the moving motor 21 is detected by the encoder 23 as the moving position of the grindstone table 20 and is output to the control device 19. A rotary grindstone 24 is rotatably supported on the grindstone stand 20 via a rotary shaft 25, and is rotated in one direction by pulleys 27 and 28 and a belt 29 by a grindstone motor 26.
[0023]
Then, in a state where the rotary grindstone 24 is arranged so as to face one portion to be ground Wa on the work W, the rotary grindstone 24 is rotated at high speed in one direction, and the work W is rotated in one direction. In this state, the rotating grindstone 24 approaches and comes into contact with the work W from a position separated from the work W. In this state, the X direction position of the rotary grindstone 24 is represented by the lift data for each rotation angle from the center of the cam to the outer peripheral surface, the diameter of the rotary grindstone 24, and the cutting amount of the rotary grindstone 24 for each rotation angle of the cam. The rotary grindstone 24 is reciprocated in the X direction according to the profile data. By the reciprocating motion of the rotary grindstone 24, the outer periphery of the portion Wa to be ground is ground into a required shape. Further, the grinding of the ground portion Wa is performed in the order of rough grinding → intermediate finish grinding → finish grinding → spark out while reducing the cutting amount (grinding allowance) of the rotary grindstone 24 with respect to the outer periphery of the ground portion Wa. Is performed through a grinding process. Through this grinding step, a cam 30 having a predetermined cam shape having a non-circular shape as shown in FIG. 6 is formed on the outer periphery of the ground portion Wa.
[0024]
In this embodiment, the cam surface of the cam 30 has a base circular portion 30a having an arc shape centered on the center of rotation, a lift portion 30b extending from both ends of the base circular portion 30a and forming a concave shape, and a lift portion 30b. And a cam top portion 30c located on the opposite side of the base circle portion 30a through the base.
[0025]
As shown in FIG. 2, the control device 19 is provided with a CPU (central processing unit) 31, a ROM (read only memory) 32, and a RAM (random access memory) 33. The CPU 31 constitutes control means for controlling the operation of the entire cam grinding machine. The ROM 32 stores programs for controlling the operation of the entire cam grinder. The RAM 33 constitutes storage means for temporarily storing various data for executing the grinding operation.
[0026]
That is, the RAM 33 stores the basic profile data D1 corresponding to the basic cam shape shown by the solid line in FIG. 3 and the final profile data D2 equivalent to the final cam shape shown by the broken line in FIG. It is stored in advance as the position of the grinding wheel head 20 with respect to the indexing angle. The final profile data D2 is different from the basic profile data D1 only in a portion indicated by a broken line.
[0027]
As shown in FIG. 5, the basic cam shape of the cam 30 according to the basic profile data D1 includes a base circular portion 30a and a slightly convex or linear lift portion 30b extending from both sides of the base circular portion 30a. And a cam top portion 30c connecting between the two lift portions 30b. As shown in FIG. 6, the final cam shape of the cam 30 according to the final profile data D2 includes a base circular portion 30a, a concave lift portion 30b extending from both sides of the base circular portion 30a, and a space between the lift portions 30b. In a so-called “gourd shape” consisting of a cam top portion 30c connecting the two.
[0028]
In each of the profile data D1 and D2, as shown in FIGS. 5A and 6A, the contact position of the portion to be ground Wa with the rotary grindstone 24 corresponds to the base circle portion 30a of the cam 30. In this case, the position of the rotary grindstone 24, that is, the position of the grindstone table 20, is set to "0". Also, as shown in FIGS. 5B and 6B, when the contact position of the portion to be ground Wa with the rotary grindstone 24 becomes a position corresponding to the lift portion 30 b of the cam 30, the grindstone table 20. Is gradually displaced from “0”. In this case, in the final profile data D2, as shown by the broken lines, the rising start portion and the falling end portion, that is, the portion of the lift portion 30b are set so that the displacement curve rises as compared with the basic profile data D1. I have. Thereafter, as shown in FIGS. 5C and 6C, when the contact position of the portion to be ground Wa with the rotary grindstone 24 becomes a position corresponding to the cam top portion 30c of the cam 30, the grindstone table The position 20 reaches the maximum displacement.
[0029]
As shown in FIGS. 4A and 4B, the RAM 33 stores data D1a and D2a of the moving speed of the rotating grindstone 24, that is, the moving speed of the grindstone table 20 in the X direction, with respect to the rotation index angle of the main shaft 14. It is stored in advance corresponding to each of the profile data D1 and D2. In this case, the moving speed data D2a corresponding to the final profile data D2 is compared with the moving speed data D1a corresponding to the basic profile data D1 in order to make the acceleration or deceleration the same or lower. It is set so that the slope of the fluctuation end portion becomes gentle. That is, the inclination of the lift portion 30b of the cam 30 is set to be gentle. Therefore, as is clear from FIG. 4B, when the final profile data D2 is executed, the moving speed of the grinding wheel head 20 is reduced by an amount corresponding to the time t1 per one rotation of the spindle. In other words, since the rough grinding is performed based on the moving speed data D1a of FIG. 4A corresponding to the basic profile data D1, the time of t1 per one rotation of the spindle is short.
[0030]
Further, as shown in FIG. 7, the RAM 33 stores a cutting amount (grinding allowance), a type of use data, and a grinding amount corresponding to each of the grinding steps of the rough grinding, the intermediate finish grinding, the finish grinding, and the spark-out. Are respectively stored in advance. That is, in the rough grinding, the cutting amount is set to a predetermined large value, the use data is set to the basic profile data D1, and the grinding amount is set to four rotations of the workpiece W. In the medium finish grinding, the cutting amount is set to a predetermined medium value, the use data is set to the final profile data D2, and the grinding amount is set to four rotations of the workpiece W. In the finish grinding, the cutting amount is set to a predetermined small value, the use data is set to the final profile data D2, and the grinding amount is set to four rotations of the workpiece W. In the spark-out, the cutting amount is set to “0”, the use data is set to the final profile data D2, and the grinding amount is set to one rotation of the work W.
[0031]
Then, based on the data stored in the RAM 33, the CPU 31 causes the grinding operation of each of the grinding processes of the rough grinding, the intermediate finish grinding, the finish grinding, and the spark out to be sequentially performed. In this case, the rotation index angle of the main shaft 14 and the moving position of the grindstone head 20 are detected from the encoders 18 and 23, and the detection results, the profile data D1 and D2, the moving speed data D1a and D2a of the grindstone head 20, and the like are obtained. , The rotation of the spindle motor 15 and the movement motor 21 is controlled. According to these controls, as shown in FIG. 5, after the ground portion Wa of the work W is ground into an oval basic cam shape, as shown in FIG. 6, it is ground into a gourd-shaped final cam shape. ing.
[0032]
Next, the operation of the cam grinder configured as described above will be described.
Now, in this cam grinding machine, when the grinding operation is started in a state where the work W is mounted between the main shaft 14 and the support shaft 17, the control of the CPU 31 of the control device 19 follows the flowchart shown in FIG. Then, each of the portions to be ground Wa on the workpiece W is ground. That is, when the grinding operation is started, first, the basic profile data D1 is read from the RAM 33 (step S1). At the same time, the cutting amount data and the grinding amount data for the rough grinding are read out from the RAM 33, and the cutting amount and the grinding amount of the rotary grindstone 24 with respect to the portion to be ground Wa are determined based on the data. ) (Step S2).
[0033]
In this state, the rotation of the spindle motor 15 and the movement motor 21 is controlled based on the basic profile data D1, and the outer periphery of the portion to be ground Wa is roughly ground by the rotary grindstone 24 at a predetermined large cutting amount (step S1). S3). As a result of this rough grinding, as shown in FIG. 5, each portion to be ground Wa of the work W is first formed in an oval cam shape. Then, it is determined whether or not the workpiece W has been rotated by the predetermined four rotations (step S4), and the process returns to the step S3 to continue the rough grinding operation until the workpiece W reaches the predetermined rotation amount.
[0034]
On the other hand, in the determination in step S4, when the work W reaches the predetermined rotation amount, the rough grinding is finished, and the final profile data D2 is read from the RAM 33 (step S5). At the same time, the cutting amount data and the grinding amount data for the medium finish grinding are read from the RAM 33, and based on the data, the cutting amount and the grinding amount of the rotary grindstone 24 with respect to the grinding target part Wa are set in the working area of the RAM 33. (Step S6).
[0035]
Thereafter, the rotation of the spindle motor 15 and the movement motor 21 is controlled based on the final profile data D2, and the outer periphery of the portion Wa to be ground is semi-finished with a predetermined medium cutting amount by the rotary grindstone 24 ( Step S7). As shown in FIG. 6, each part to be ground Wa of the work W is formed from the egg-shaped cam shape after the coarse grinding to a gourd-shaped cam shape having a concave portion in the lift portion 30b by the semi-finishing. . Then, it is determined whether or not the work W has been rotated by the predetermined four rotations (step S8), and the process returns to the step S7 to continue the intermediate finish grinding operation until the work W reaches the predetermined rotation amount.
[0036]
Further, in the determination of the step S8, when the workpiece W reaches the predetermined rotation amount, the intermediate finish grinding is finished, the cutting amount data and the grinding amount data for the finish grinding are read from the RAM 33, and based on the data. The cutting amount and the grinding amount of the rotary grindstone 24 are set (Step S9). Then, the rotation of the spindle motor 15 and the movement motor 21 is controlled based on the final profile data D2, and the outer periphery of the portion to be ground Wa is finished into a gourd-shaped cam shape by the rotary grindstone 24 at a predetermined small cutting amount. It is ground (step S10). Thereafter, it is determined whether the work W has been rotated by the predetermined four rotations and finish grinding has been completed (step S11), and the flow returns to step S10 to continue the finish grinding operation until the work W reaches the predetermined rotation amount. .
[0037]
On the other hand, when the work W reaches the predetermined rotation amount in the determination of the step S11, the finish grinding is finished, and the cutout amount data and the grinding amount data for spark out are read from the RAM 33, and the rotation is performed based on the data. The cutting amount and the grinding amount of the grindstone 24 are set (Step S12). Then, the rotation of the spindle motor 15 and the movement motor 21 is controlled based on the final profile data D2, and the outer periphery of the portion to be ground Wa is sparked into a gourd-shaped cam shape by the rotary grindstone 24 at a cutting amount “0”. Out (step S13).
[0038]
Thereafter, it is determined whether the work W has been rotated by a predetermined rotation (step S14), and the process returns to step S13 to continue the spark-out operation until the work W reaches the predetermined rotation amount. Then, when the workpiece W is rotated by a predetermined rotation, the grinding in the respective grinding steps on the workpiece Wa of the workpiece W is completed, and the outer periphery of the workpiece Wa has a predetermined gourd-shaped cam shape. Is formed.
[0039]
Therefore, according to this embodiment, the following effects can be obtained.
(1) In this cam grinder, a plurality of profile data including basic profile data D1 corresponding to the basic cam shape and final profile data D2 corresponding to the final cam shape are stored in the RAM 33 of the control device 19 in advance. It has become. In accordance with the progress of the plurality of grinding processes for the workpiece W, a plurality of data from the basic profile data D1 to the final profile data D2 are sequentially read from the RAM 33 under the control of the CPU 31 of the control device 19, and the data are read out. Based on this, the grinding operation is performed stepwise.
[0040]
For this reason, for example, when grinding a cam-shaped cam 30 having a concave portion such as a gourd-shape, the grinding in each grinding process is performed by resetting the profile data between the grinding processes by one cam grinder. In addition, there is no need to perform a troublesome operation of changing the setting of the profile data. Also, as in the case of performing grinding in a plurality of grinding processes using different profile data using a plurality of cam grinders, a plurality of cam grinders are prepared, and a work W is placed between each cam grinder. There is no need to transport. Therefore, the cam 30 having a concave shape such as a gourd-shaped cam can be efficiently and quickly ground through a grinding process based on a plurality of profile data. That is, as compared with the conventional method, the spindle speed of the rough grinding and the semi-finishing can be increased, so that the total grinding time can be shortened.
[0041]
(2) In this cam grinder, the basic profile data D1 comprises data corresponding to an oval basic cam shape, and the final profile data D2 comprises data corresponding to a gourd-shaped final cam shape. For this reason, the present invention is particularly effective when grinding a gourd-shaped cam 30 having concave portions in both lift portions 30b, such as a cam in a vehicle engine.
[0042]
(Example of change)
This embodiment can be embodied with the following changes.
In the above embodiment, rough grinding and semi-finishing are performed based on the basic profile data D1 corresponding to the oval basic cam shape, and finishing is performed based on the final profile data D2 corresponding to the gourd-shaped final cam shape. Perform grinding and spark-out.
[0043]
In the above-described embodiment, the intermediate finish grinding is divided into two times, and the rough grinding and the first intermediate finish grinding are performed based on the basic profile data D1, and the second intermediate finish grinding, the finish grinding, and the spark-out are performed in the final profile data D2. To do so.
[0044]
In the above embodiment, three or more profile data including the basic profile data and the final profile data are stored in the RAM 33 in advance, and these data are read out in order to perform the grinding in each step step by step. To be. For example, the basic profile data, the intermediate profile data, and the final profile data are stored in advance, and they are sequentially read out to perform a grinding process.
[0045]
In the above embodiment, the cutting amount and the grinding amount (the rotation amount of the work W) in each grinding step are arbitrarily changed and set.
In the above embodiment, the basic profile data D1 is changed to data corresponding to a basic cam shape different from the egg shape, and the final profile data D2 is changed to data corresponding to a final cam shape different from the gourd shape. .
[0046]
【The invention's effect】
As described above in the embodiment, in the present invention, a cam having a concave shape such as a gourd can be efficiently and quickly ground through a plurality of grinding steps.
[Brief description of the drawings]
FIG. 1 is a side view showing a cam grinder according to one embodiment.
FIG. 2 is a plan view of the cam grinder of FIG. 1;
FIG. 3 is an explanatory diagram of data relating to a position of a grinding wheel head.
4A is an explanatory diagram of data relating to a moving speed of a grinding wheel head according to basic profile data, and FIG. 4B is an explanatory diagram of data relating to a moving speed of a grinding wheel head according to final profile data.
5A is an explanatory view showing a grinding state of a base circle portion of a cam having a basic cam shape, FIG. 5B is an explanatory view showing a grinding state of a lift section, and FIG. Explanatory drawing which shows a state.
6A is an explanatory diagram showing a grinding state of a base circle portion of a cam having a final cam shape, FIG. 6B is an explanatory diagram showing a grinding state of a lift portion, and FIG. Explanatory drawing which shows a state.
FIG. 7 is an explanatory diagram showing sections of a cutting amount, use data, and the like for each grinding process.
FIG. 8 is a flowchart showing a grinding operation by the cam grinder of FIG. 1;
FIG. 9A is a front view of a gourd-shaped cam, and FIG. 9B is an explanatory view of a conventional cam grinding method.
[Explanation of symbols]
14 ... spindle, 15 ... spindle motor, 19 ... controller, 20 ... grindstone head, 21 ... moving motor, 24 ... rotating grindstone, 26 ... grindstone motor, 30 ... cam, 30b ... lift unit, 31 ... control means CPU 33, RAM as storage means, W work, D1 basic profile data, D2 final profile data.

Claims (4)

In a cam grinding machine that grinds the outer periphery of the work into a predetermined cam shape by a plurality of grinding processes,
Storage means for storing a plurality of profile data including at least basic profile data corresponding to the basic cam shape, and final profile data corresponding to the final cam shape;
Control means for sequentially reading a plurality of profile data from the basic profile data to the final profile data from the storage means in accordance with the progress of the grinding step, and performing a grinding operation stepwise based on the data. A characteristic cam grinding machine. The basic profile data is data corresponding to a basic cam shape having a base circle portion, a lift portion, and a cam top portion, and the final profile data is data corresponding to a final cam shape in which the lift portion is concave. The cam grinding machine according to claim 1, wherein In a cam grinding method for grinding the outer periphery of a work into a predetermined cam shape by a plurality of grinding steps,
A plurality of profile data including at least basic profile data corresponding to the basic cam shape and final profile data corresponding to the final cam shape are stored in advance,
A cam grinding method characterized by sequentially reading out a plurality of profile data from basic profile data to final profile data in accordance with the progress of the grinding step, and performing a grinding operation stepwise based on the data. A basic cam shape having a base circle portion, a lift portion, and a cam top portion is ground according to the basic profile data, and a final cam shape having a concave portion of the lift portion is ground according to final profile data. 3. The cam grinding machine according to 3.

Images