JP2000127040A - Grinding condition setting device for grinding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a grinding condition setting device for a grinding machine allowing an unskilled worker to conduct the work satisfying machining precision and grinding efficiency and obtain the desired machined surface roughness without making trial machining even when grinding a work for the first time. SOLUTION: This setting device is provided with a calculating device 10 and a database DB correspondingly storing the type of grinding wheels, i.e., the material, grain size and hardness of the grinding wheels, the type of works, i.e., the material and hardness of the works, cut quantity, machined surface roughness, and dress conditions. A candidate grinding wheel suitable for machining is extracted from the database DB based on the material and hardness of the inputted work and the machined surface roughness. When the grinding wheel to be used for machining is determined, the cut quantity and dress conditions corresponding to the inputted machined surface roughness are extracted from the database DB.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grinding condition setting apparatus for a grinding machine for grinding a surface of a work by relatively moving a grindstone and a work in XYZ directions.

[0002]

2. Description of the Related Art An NC grinding machine grinds the surface of a work by moving a grindstone and a work relatively in an up-down direction and a front-rear direction parallel to a grindstone axis and in a left-right direction perpendicular to the front-rear direction by NC control. It is a device to do. Such an NC grinder will be described with reference to FIG. FIG. 8 is an overall configuration diagram of a conventional NC surface grinder. In this figure, 1 is a bed.
Reference numeral 2 denotes a table, which is slidably supported on the bed 1 in the left-right direction and reciprocated by a hydraulic cylinder (not shown).
Reference numeral 3 denotes a chuck having a magnet therein and is fixed to the table 2 and holds an iron-based work (not shown). 4a, 4b
Is a proximity sensor attached to the bed 1 and the table 2
A signal is output when the dog faces a dog (not shown) attached to the camera. Reference numeral 5 denotes a grindstone, which is rotatably supported by the spindle head 6. The spindle head 6 is slidably supported by a column 7 in a vertical direction (a direction perpendicular to the grinding wheel axis), and is positioned by a servo motor (not shown). The column 7 is slidably supported on the bed 1 in the front-rear direction (the direction of the grindstone axis), and is positioned by a servo motor (not shown). Reference numeral 8 denotes an NC control device that controls a servomotor or the like that drives the spindle head 6 and the column 7. Reference numeral 9 denotes a dressing device which holds a dresser having a single stone diamond particle fixed at the tip, and is placed on the left end of the table 2.

Next, the operation of the conventional NC surface grinder will be described. A machining program in which machining conditions, machining positions, dressing times, and the like are described in advance is created and input to the NC control device 8. When the start button (not shown) is turned on after rotating the grindstone 5, the table 2 moves, and the moving direction is switched every time the dog faces the proximity sensors 4a, 4b, and reciprocates in the left-right direction (length direction). .

In the case of plunge grinding, each time the right end, that is, the dog faces the proximity sensor 4b, or the left and right ends, that is, the dog is moved to the proximity sensors 4a, 4a in accordance with the machining program.
Each time the grindstone 5 is cut into the work by a fixed amount each time it faces the workpiece b, the grindstone 5 is moved in the front-rear direction (width direction) by a predetermined distance after processing to a predetermined dimension.
Repeat until processing is completed.

[0005] In the case of traverse grinding, the grinding wheel 5 is changed every time the moving direction of the table 2 changes in accordance with the machining program.
Is moved in one direction in the front-rear direction by a predetermined amount, and when turning back at each moving end, the grindstone 5 is cut by a certain amount.
Is repeated until the machining is completed.

At the time specified by a machining program before and during grinding, the grindstone 5 is moved in the front-rear direction with the lower surface of the grindstone 5 cut into the tip of the dresser of the dressing device 9 to dress the grindstone 5. Is performed to eliminate the clogging of the grindstone 5.

[0007]

For example, Table 1 of Japanese Industrial Standard JISB4051 which standardizes the selection criteria of grinding wheels shows the selection criteria of grinding wheels for general metal materials. Once the hardness is determined, a grindstone suitable for processing can be selected. However, the table does not describe the cutting depth and dress conditions. For this reason, the cutting depth and dressing conditions are often set based on the experience and intuition of the operator, and the accuracy (dimensional accuracy in the height direction; the same applies hereinafter) and the grinding efficiency depend on the skill of the operator. Was done. In the case of grinding a work with inexperience in material and the like, trial processing is performed while changing grinding conditions until a desired finished surface roughness is obtained. Further, there are various types of grinding wheels, and it is difficult for an unskilled person to select a grinding wheel.

[0008] An object of the present invention is to solve the above-mentioned problems in the prior art, so that even an unskilled person can perform work that satisfies the processing accuracy and grinding efficiency, and even when grinding a work for the first time. It is an object of the present invention to provide a grinding condition setting device for a grinding machine capable of obtaining a desired finished surface roughness without performing trial processing.

[0009]

Means for Solving the Problems In order to achieve the above-mentioned object, the invention according to claim 1 is characterized in that the type of grindstone (material, grain size and hardness), the type of work (material and hardness), the cutting depth, A database storing the finished surface roughness and the dress conditions in association with each other, and an arithmetic unit, wherein the arithmetic unit processes the database based on the input material of the workpiece, the hardness of the workpiece and the finished surface roughness. It is configured to extract a suitable grinding wheel candidate for, and when a grinding wheel to be used for processing is determined, the cutting amount and the dress condition corresponding to the input finished surface roughness are extracted from the database. Features.

The invention according to a second aspect is characterized in that, in the first aspect, the cut amount is corrected and output by any one of the thickness, accuracy, and efficiency of the work.

Further, the invention according to claim 3 is characterized in that the feed rate of the dresser is corrected and output according to the tip shape of the dresser.

Further, the invention of claim 4 is the invention of claims 1, 2,
And 3, the surface area of the processing portion, the width and diameter of the grindstone, the table feed speed, the relative movement amount of the grindstone with respect to the work in the horizontal direction, the movement amount in the cutting direction, and the extracted from the database The processing time is calculated from the cut amount and the dress condition.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiments. FIG. 1 is a configuration diagram of a grinding condition setting device according to the present invention. In the figure, reference numeral 10 denotes an arithmetic unit. 1
Reference numeral 1 denotes a hard disk device, which is connected to the arithmetic unit 10;
It stores an operation program and a database DB including various types of information described below. Reference numeral 12 denotes a floppy disk device which is connected to the arithmetic unit 10 and used for data backup and the like. Reference numeral 13 denotes a display device having a graphic display function, which is connected to the arithmetic unit 10. 14
Is an input device such as a keyboard. A communication cable 15 connects the arithmetic unit 10 and the NC control unit 8.

Next, the database DB will be described. FIG. 2 is a diagram illustrating a configuration of the database DB.
The database DB contains the material, grain size and hardness of the grindstone, the material and hardness of the work, the amount of cut and the number of spark-outs in each step of the rough grinding, medium grinding, and fine grinding, and the finished surface obtained as a result. Roughness and condition No. of dressing. And a work removal amount (volume) per unit area of the grindstone that can be ground by one dressing is stored.

The dress condition is the condition No. Every,
The specifications shown in FIG. 3, that is, the amount of cut k per cut with respect to the grindstone when the tip of the dresser is at an acute angle
, The number of cuts m, the feed speed v, and the number of colorless are determined and stored in the database DB.

Next, the operation of this embodiment will be described. FIG. 4 is a flowchart showing the procedure for setting the grinding conditions.
When a condition setting button (not shown) is turned on, the arithmetic unit 10
Causes the display device 13 to display an input screen for the grinding wheel selection condition shown in FIG. The operator inputs the material, hardness and required finished surface roughness of the work from the input device 14 according to the instruction of the design drawing or the specification (step S10).
0). The arithmetic unit 10 extracts the optimum whetstone and the recommended whetstone (two types in this embodiment) from the database DB based on the input whetstone selection condition, and displays a screen as shown in FIG. (Step S110). The operator selects the optimum whetstone if the optimum whetstone can be used, and selects the whetstone if any of the recommended whetstones can be used even if there is no optimum whetstone (step S120), and selects a whetstone (not shown). The determination button is pressed (step S130), and if there is no grindstone, the operation is stopped (step S220). When the grindstone is determined, the arithmetic unit 10 sets the amount of cut, the number of times of cut, the number of times of spark-out, and the dressing condition in each of the rough grinding, medium grinding, and fine grinding steps described in the corresponding stage of the database DB. Is temporarily determined as a grinding condition (procedure S140). By the above procedure, standard processing, that is, processing condition setting in which accuracy and processing efficiency are averaged, is completed.

Next, the arithmetic unit 10 causes the display unit 13 to
A correction parameter input screen shown in FIG. 7 is displayed. The operator inputs, from the input device 14, information on the plate thickness, information on the tip shape of the currently set dresser, and information on the work contents (hereinafter collectively referred to as correction information) (step S150). ) And press the next button (step S16)
0). Then, the correction information is stored in the arithmetic device. The purpose of inputting the correction information is as follows. (1) Sheet thickness information: In the case of a thin work, the work after processing may be warped. Therefore, the plate thickness is 3.2
In the case of not more than mm, the cutting amount per operation in each of the rough grinding, the medium grinding and the fine grinding is reduced to prevent the occurrence of warpage. (2) Information on the shape of the tip of the dresser: When the shape of the tip of the dresser is round, the unevenness of the grinding surface of the grindstone can be reduced even if the feed speed v is increased. (3) Work content information: When the standard is selected, the value of the provisionally determined database DB is used as it is. In this case, both the accuracy and the processing efficiency are average values. When “accuracy” is selected, the value of the cut amount is reduced. In this case, although efficiency is reduced, generation of heat during processing can be suppressed, and accuracy can be improved. When “efficiency” is selected, the value of the cut amount is increased. In this case, heat generation at the time of processing increases, and accuracy decreases, but the processing time can be shortened. Note that the finished surface roughness is maintained in any case. (4) Work dimensions: Data for calculating dress intervals. That is, the amount of grinding (the amount of removal of the workpiece) is calculated from the surface area of the processed portion and the amount of cut, and the intervals at which dressing is performed in each of the rough grinding, medium grinding, and fine grinding are determined.

The arithmetic unit 10 confirms the contents of the correction information (step S170), and when no correction is necessary (when the plate thickness is 3.2).
mm or more, when the dresser is sharp, when the accuracy and efficiency are standard), the value provisionally determined in step S140 is corrected, and when correction is necessary, the value provisionally determined in step S140 is corrected by a predetermined amount. (Step S180), that is,
If “accuracy” is selected, for example, the cut amount is set to 70% of the standard value, and if “efficiency” is selected, correction is performed, for example, to set the cut amount to 120% of the standard value. When the shape of the tip of the dresser is round, a correction is made such that the horizontal feed speed of the dresser is set to, for example, 120% of a standard value, and then each value is input to a predetermined position in the machining program ( Step S190).

Next, the user inputs a grinding method, that is, whether to grind by plunge grinding or traverse grinding (step S200). In general, plunge grinding is selected when processing a workpiece whose width is smaller than the grindstone width and when grinding a groove approximately equal to the grindstone width. In other cases, especially when trying to improve the surface quality (appearance), Traverse grinding may be performed.

Subsequently, data necessary for processing for each work is input (step S210). That is, the width and diameter of the grindstone, the table feed speed, and the relative movement amount of the grindstone in the horizontal direction with respect to the work (the total movement amount of the grindstone in the front-rear direction and the left-right direction, and the movement amount of the grindstone in the front-rear direction each time) , The moving speed in the front-back direction, the table speed) and the moving amount in the cutting direction are input according to an input screen (not shown). This completes the setting of the grinding conditions.

When a time measurement button (not shown) is turned on, the arithmetic unit 10 calculates a processing time including a dress time based on the input data.

In the above, since the values stored in the database DB are directly input to the machining program, not only the work efficiency is improved but also an input error can be prevented.

The result of step S190 may be displayed on a display device and manually input. In this way, the present invention can be applied to a grinding machine for manually setting conditions.

In the above description, a ferrous work has been described. However, the present invention is not limited to a ferrous work, and can be applied to a case of processing a non-ferrous work.

Further, in the above description, the grinding condition setting device is set to N
Although connected to the C control device, the device can be operated only by this device, so that data can be created in an office or the like.

[0026]

As described above, according to the present invention,
The type of the grindstone, the type of the work, the cutting amount, the finished surface roughness, and a database storing the dress conditions in association with each other, and a calculation device are provided, and the input work material,
Based on the hardness of the work and the finished surface roughness, candidates for grinding wheels suitable for processing are extracted, and when the grinding wheel to be used for processing is determined, the cutting amount and dress conditions corresponding to the input finished surface roughness are determined. Because it is configured to extract from the database, even unskilled workers can perform work that satisfies machining accuracy and grinding efficiency, and even when grinding the first work, it is possible to perform desired work without performing trial work. Finished surface roughness can be obtained.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a grinding condition setting device according to the present invention.

FIG. 2 is a diagram showing a configuration of a database DB.

FIG. 3 is a diagram illustrating contents stored as dress conditions.

FIG. 4 is a flowchart showing a procedure for setting grinding conditions.

FIG. 5 is an input screen of a grindstone selection condition.

FIG. 6 is a whetstone selection screen.

FIG. 7 is an input screen of a correction parameter.

FIG. 8 is an overall configuration diagram of a conventional NC surface grinder.

[Explanation of symbols]

 10 Computing device DB database

Claims (4)

[Claims] 1. Type of whetstone (material, particle size and hardness)
A work type (material and hardness), a depth of cut, a finished surface roughness, and a database storing the dress conditions in association with each other, and an arithmetic unit, wherein the arithmetic unit is configured to input the material of the work. Based on the hardness of the workpiece and the finished surface roughness, a candidate for a grindstone suitable for machining is extracted from the database, and when a grindstone to be used for machining is determined, the cutting amount corresponding to the input finished surface roughness is determined. A grinding condition setting device for a grinding machine, wherein the grinding condition and the dress condition are extracted from the database. 2. The grinding condition setting device for a grinding machine according to claim 1, wherein the cut amount is corrected and output according to any one of the thickness, accuracy, and efficiency of the work. 3. The dresser feed speed is corrected according to the shape of the tip of the dresser and output.
2. A search condition setting device for a grinding machine according to item 1. 4. The surface area of the processing portion, the width and diameter of the grindstone, the table feed speed, the relative movement amount of the grindstone with respect to the work in the horizontal direction, the movement amount of the cutting direction, and the information extracted from the database. The grinding condition setting device for a grinding machine according to claim 1, wherein a processing time is calculated from the cut amount and the dress condition. 5.