JPH10109268A - Coolant supply device for grinding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To always supply coolant at a contact point of a grinding wheel and a crank pin and to prevent the occurrence of grinding burning by controlling coolant nozzle moving means in synchronization with a profile making movement of a grinding wheel by profile data. SOLUTION: A set of positioning data comprising the data of amount of movement made by adding the depth of cut per unit angle to read-out profile data read out and the data of speed is output to a drive unit 40 to move a wheel spindle stock 20. At the same time, the rotation angle of the corresponding main spindle and the rotation angle of a servomotor 26 are output to a drive unit 42, respectively. A coolant nozzle 25 is moved along the outer periphery of a grinding wheel G via an oscllating arm 27 in synchronization with the movement of the grinding wheel G to surely always supply coolant to a contact point of a crank pin and the grinding wheel G.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coolant supply device for supplying coolant to a contact point between a grinding wheel and a crankpin in a grinding machine for grinding a crankpin of a crankshaft.

[0002]

2. Description of the Related Art Generally, in a grinding machine, a coolant is supplied to a contact point (grinding point) between a workpiece and a grinding wheel to generate heat by grinding and to remove chips, so that the workpiece is burnt. And so on. When the cylindrical grinding is performed, the above-mentioned contact point is a fixed position of the grinding wheel, and the coolant nozzle for supplying the coolant is fixed because only the coolant needs to be supplied to the fixed position.

[0003]

However, Japanese Patent Application Laid-Open No.
As disclosed in US Pat. No. 1,115,986, the journal of the crankshaft is held on the main shaft and intersects with the main shaft axis along the turning trajectory of the crankpin which rotates around the main axis when the journal is rotated on the main shaft. In the case of performing grinding by feeding the grinding wheel in the direction of the grinding, the contact point between the grinding wheel and the crank pin, that is, the grinding point moves along the outer periphery of the grinding wheel.

[0004] For this reason, if the coolant is merely supplied to the fixed position as in the prior art, the coolant is not sufficiently supplied to the grinding point, and there is a fear that grinding burn or the like may occur.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to make sure that the coolant always moves to the grinding point even when the grinding point moves. According to the first aspect of the present invention, a coolant nozzle that discharges a coolant, a coolant nozzle moving unit that moves the coolant nozzle along an outer periphery of a grinding wheel, and a coolant nozzle that discharges the coolant nozzle are discharged from the coolant nozzle. Swing control means for controlling the coolant nozzle moving means in synchronization with the profile creation movement of the grinding wheel based on the profile data so that coolant is supplied to the contact point between the grinding wheel and the crank pin. Is what you do.

According to a second aspect of the present invention, there is provided a swing arm having one end holding a coolant nozzle and the other end rotatably mounted on a rotation axis of a grinding wheel, and driving means for swinging the swing arm. And a coolant nozzle moving means.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described based on specific embodiments. FIG. 1 is a configuration diagram showing a numerically controlled grinding machine. Reference numeral 10 denotes a bed of a numerically controlled grinding machine, on which a table 11 is slidably disposed in a Z-axis direction parallel to the main shaft axis. A headstock 12 on which a spindle 13 is mounted is arranged on the table 11, and the spindle 13 is rotated by a servomotor 14. Also,
A tailstock 15 is placed on the right end of the table 11, and a center 16 of the tailstock 15 and a center 17 of the main shaft 13 clamp a crankshaft W composed of a Janal J and a crankpin P. The workpiece W is fitted on a positioning pin 18 protruding from the main shaft 13, and the rotational phase of the workpiece W matches the rotational phase of the main shaft 13.

[0008] Behind the bed 10, a tool feed shaft (X
The grindstone head 20 which can move forward and backward along the axis) is guided along the grindstone wheel G, which is rotationally driven by a motor 21.
Is supported. The grinding wheel head 20 is connected to a servomotor 23 via a feed screw (not shown).
The forward / backward rotation of 3 causes the vehicle to move forward and backward. A grindstone cover 24 is mounted on the outer periphery of the grinding wheel G, and a servomotor 26 for moving a coolant nozzle 25 described later is mounted on the grindstone cover 24.

The coolant nozzle 25 is connected to one end of a swing arm 27, and coolant is supplied to the coolant nozzle 25 from a pump 29. The other end of the swing arm 27 is rotatably mounted on the rotation axis O of the grinding wheel G of the grinding wheel cover 24. By swinging the swing arm 27, the coolant nozzle 25 attached to one end moves along the outer diameter of the grinding wheel G.

It is possible to cope with a change in the diameter of the grinding wheel G by appropriately adjusting the length from the rotation center of the swing arm 27 to the mounting position of the coolant nozzle 25. One end of a first arm 28a is swingably connected to the rotation shaft of the servo motor 26,
A second arm 28b is swingably connected to the other end of the arm 28a.

The other end of the second arm 28b is connected to the swing arm 2
7 is swingably fixedly connected to the swing arm 27 via an elongated hole 27a formed substantially at the center of the swing arm 7. The long hole 27a is
The joint position of the second arm 28b on the swing arm 27 can be moved. By moving the joint position of the second arm 28b on the swing arm 27, the swing amount of the clant nozzle 25 is appropriately adjusted. can do.

The first and second arms 28a and 28b constitute a crank mechanism 28. When the servomotor 26 rotates, the swing arm 27 rotates about the rotation axis O of the grinding wheel G as a fulcrum. The coolant nozzle 25 attached to one end of the swing arm 27 moves along the outer periphery of the grinding wheel G while keeping a constant distance from the outer periphery of the grinding wheel G. The drive units 40 and 41 are circuits for inputting command values from the numerical control device 30 and driving the servo motors 23 and 14, respectively, as shown in FIG. Drive unit 4
0 is a deviation counter 401 for inputting a command value from the numerical controller 30 and a feedback signal from the rotary encoder 52 as shown in FIG. 3, a DA converter 402 for DA conversion of the output, and a speed generator for the output. And an amplifier 403 for subtracting and amplifying the output of 53 and applying a drive voltage to the servomotor. The drive unit 41
Has the same configuration, and thus the description is omitted.

The drive unit 42 is a circuit for inputting a command value from the numerical control device 30 and driving the servo motor 26.
It comprises a DA converter 421 for conversion, and an amplifier 422 for amplifying the output and applying a drive voltage to the servomotor 26. The numerical controller 30 mainly includes the servomotors 23, 1
This is a device that numerically controls the rotations of the workpieces 4 and 26 and controls the grinding of the workpiece W. A keyboard 43 for inputting control data and the like, a CRT display device 44 for displaying various information, and a control panel 45 for outputting various control signals are connected to the numerical control device 30.

As shown in FIG. 3, the numerical control device 30
It mainly comprises a main CPU 31 for controlling the grinding machine, a ROM 33 storing a control program, a RAM 32 storing input data and the like, and an input / output interface 34. On the RAM 32, there are provided an NC data area 321 for storing NC data and a profile data area 322 for storing profile data determined from the turning locus of the crankpin. In addition, a feed mode setting area 324 and a workpiece mode setting area 326 for setting various modes are provided.

In the profile data area 322, as shown in FIG. 4, the position of the grinding wheel 13 and the rotation angle position of the servo motor 25 for determining the tip position of the coolant nozzle 25 for each unit angle of the spindle 13 are represented by one block. The data for one round of the journal is stored as profile data. Numerical control device 30 includes other servo motor 2
Drive system for the drive CPU 36 and RAM 3
5 are provided. The RAM 35 is a main CPU 31
This is a storage device for inputting the positioning data of the grinding wheel G from. The drive CPU 36 is a device that numerically controls the spindle 13 and the grinding wheel head 20, performs calculations such as slow-up, slow-down, and interpolation of a target point, and outputs positioning data of the interpolation point at a constant cycle.

Next, the operation will be described. The NC data including the processing cycle data is stored in the RAM 32.
The machining cycle data is shown in FIG. When the button 452 of the control panel 45 is pressed, machining cycle data is activated. The NC data is decoded by the CPU 31 according to the procedure shown in the flowchart of FIG.

In step 100, one block of the NC data is read, and in the next step 102, it is determined whether or not the data is end. In the case of data end, this program ends. If not data end, step 1
The process proceeds to 04 or lower, and the code of the instruction word is determined. If it is determined in step 104 that the instruction word is a G code, a more detailed instruction code is determined.
The process of U moves to step 106.

In steps 106 to 112, the mode is set according to the instruction code. G0 in step 106
If it is determined to be one code, a flag is set in the feed mode setting area 323 in step 108, and the feed mode is set to the grinding feed mode. Step 110
When it is determined in step 112 that the code is a G51 code, a flag is set in the workpiece mode setting area 324 in step 112, and the workpiece mode is set to the pin grinding mode.

When the above mode setting is completed, the routine proceeds to step 114, where it is determined whether or not there is an M code. If it is determined in step 114 that the block read out has the M code, the process proceeds to step 116 to determine whether the M code is the M08 code. If it is the M08 code, the process proceeds to step 118, where the pump 29 is driven and the coolant is discharged from the coolant nozzle 25.

If it is determined in step 116 that there is no M08 code, the flow advances to step 120 to determine whether or not the code is M09. Here, if it is M09 code,
In step 122, the pump 29 is stopped, the supply of coolant from the coolant nozzle 25 is stopped, and the process proceeds to step 124. If the code is not the M09 code, the process proceeds to step 124.

If it is determined in step 124 that there is an X code in the read block, the process proceeds to step 136, in which the mode is set to the pin grinding mode and the grinding feed mode (hereinafter, referred to as the grinding mode).
(Referred to as “pin / grinding mode”). In the pin / grinding mode, in step 128, a distribution process for creating a pin is performed. On the other hand, when the mode is not the pin / grinding mode, distribution processing not synchronized with the normal rotation of the main spindle is performed in step 130.

<Processing> When the button 452 of the control panel 45 is pressed, the processing cycle data shown in FIG. 5 is decoded one block at a time according to the flowchart of FIG. First, by a block not shown, the grinding wheel G is rotated and the grinding wheel base 20 is rapidly advanced and advanced to a predetermined position, and the crank pin P for performing the grinding by moving the table 11 is moved to a position facing the grinding wheel G. Is determined.

Next, the workpiece mode is set to the pin grinding mode by the G51 code of the block N010, and the profile data to be used is designated by the number P1234.
The supply of the coolant is started by the MO8 code of N020 in the next block. The grinding feed mode is set by the G01 code of the block N030, and the pin grinding process is performed by X-0.1 due to the presence of the X code. F code is the amount of grinding per spindle revolution, R code is the spindle
It shows the grinding speed per revolution. The S code indicates the rotation speed of the main shaft.

In the NC data shown in FIG. 5, since the designated numerical values of the F code and the R code are equal, it is instructed to continuously cut the main shaft at a constant speed. The profile creation is executed according to the flowchart of FIG. First,
In step 200, a cutting amount for each unit rotation angle of the main shaft of 0.5 ° is calculated from the given F code. Next, at step 202, the head address of the address where the profile data for the origin of the command angle of the spindle is stored is set as the initial value of the read address I. Next, in step 204, an output completion signal is input from the drive CPU 36, and it is determined whether or not the output in the previous cycle has been completed. If it is determined that the output has been completed, the process proceeds to step 206 and the profile data D (I) Is read, and it is determined in step 208 whether or not the cut per spindle rotation has been completed. This determination is made based on numerical data specified by the F code. In this case, it is determined whether or not a cut of 0.1 mm has been made. If the cut per spindle rotation is not completed, step 21
0, the amount of cut per unit angle is added to the read profile data D (I) to generate movement amount data,
In step 212, the positioning data, which is a combination of the movement amount data and the speed data, is output to the drive unit 40, and the wheel head 20 is moved. At the same time, the corresponding rotation angles of the main shaft 13 and the servo motor 26 are output to the drive units 40 and 41, respectively.

When the cutting per spindle rotation is completed, the execution profile data D (I) read out at step 213 is used as the moving amount data of the grinding wheel head as it is. Next, in step 214, it is determined whether or not the read address I is equal to or more than the end address Imax of the execution profile data. When I ≧ Imax, step 2
At step 16, the read address I is set to the initial value to return to the top of the table, otherwise, at step 218
, The read address I is updated by 1 and step 220
Then, it is determined whether or not all cuts have been completed.

This determination is made from the numerical data specified by the X code. If all the cuts have not been completed, the process proceeds to step 204 and proceeds to the next control cycle. On the other hand, if all cuts have been completed, block N
After the pin grinding process instructed in O30 is completed and the supply of the clant is stopped by the M09 code instructed in block NO40, the grindstone head is quickly retreated to a predetermined position by a block (not shown).

As described above, by moving the grindstone table 20 in synchronization with the rotation of the spindle 13, the crankpin that rotates around the spindle axis as shown in FIGS. 8A to 8D is ground. Can be. Further, the coolant nozzle moves in synchronism with the movement of the grinding wheel G, always supplying the coolant to the contact point between the crankpin and the grinding wheel G, cooling the grinding wheel G and the crankpin P and removing chips. Thus, it is possible to prevent grinding burn and processing failure of the crankpin P.

In the above embodiment, the rotary motion of the servomotor is converted into a linear motion by using the crank mechanism 28 constituted by the first and second arms 28a and 28b to move the swing arm 27. However, the present invention is not limited to this, and the swing arm 27 may be formed by using a linear motion driving source such as a cylinder device such as a hydraulic cylinder or linear motor.
May be moved.

[0029]

As described above, according to the first aspect of the present invention, the coolant nozzle is moved on the basis of the profile data for causing the grinding wheel to generate a profile along the turning trajectory of the crank pin, and the coolant is moved to the grinding wheel and the crank. Since it is supplied to the contact point of the pin, the coolant can always be supplied to the contact point of the grinding wheel and the crank pin, and there is an effect that the occurrence of grinding burn and the like can be prevented.

According to the second aspect of the present invention, since the coolant nozzle is attached to the tip of the swing arm that turns on the rotation axis of the grinding wheel, the coolant nozzle can draw a locus along the outer periphery of the grinding wheel. it can. Thereby, the distance between the coolant nozzle and the outer periphery of the grinding wheel can be made constant, and more stable coolant can be supplied.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a numerically controlled grinding machine according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of a numerically controlled grinding machine according to an embodiment of the present invention.

FIG. 3 is a block diagram showing an electric configuration of the numerical controller.

FIG. 4 is a diagram showing a part of profile data;

FIG. 5 is a diagram showing a part of machining cycle data.

FIG. 6 is a flowchart showing a processing procedure of a CPU.

FIG. 7 is a flowchart showing a processing procedure of a CPU.

FIG. 8 is an operation explanatory view showing movement of a grinding wheel head and movement of a coolant nozzle.

[Explanation of symbols]

 10 Bed 11 Table 13 Spindle 14 Servo motor 15 Tailstock 20 Grinding wheel 25 Coolant nozzle 26 Servo motor 30 Numerical controller G Grinding wheel W Workpiece

Claims (2)

[Claims] 1. A spindle for holding a journal of a crankshaft on a main spindle, and based on profile data for causing a grinding wheel to perform a profile generating motion along a turning locus of a crankpin revolving around the axis of the main spindle, the main spindle and a grinding wheel feed shaft. A coolant nozzle that discharges a coolant, a coolant nozzle moving unit that moves the coolant nozzle along the outer circumference of a grinding wheel, and a coolant that is discharged from the coolant nozzle. Swing control means for controlling the coolant nozzle moving means in synchronization with the profile creation movement of the grinding wheel based on the profile data so that the coolant is supplied to the contact point between the grinding wheel and the crankpin. Coolant supply device for grinding machines. 2. The coolant nozzle according to claim 1, further comprising: a swing arm having one end holding the coolant nozzle and the other end rotatably mounted on the rotation axis of the grinding wheel, and driving means for swinging the swing arm. 2. The coolant supply device for a grinding machine according to claim 1, wherein the moving means is constituted.