JPS6374550A - Machine tool - Google Patents

Abstract

PURPOSE:To efficiently perform desired machining in a short time, by controlling a relative movement between a tool and a work so that the machining less than a cut width, set in the case of machining the outermost periphery, is executed when the center position side of the final machining shape is machined. CONSTITUTION:A tool forms its moving route data assuming that machining is performed by a preset cut width from the outermost periphery of the final machining shape, and the machining is executed from the center side of the final machining shape on the basis of said data. Accordingly, if the next machining is executed by moving the tool by the preset cut width after the final machining shape is machined as in the past, a machining distance increases longer naturally resulting in also the surplus waste of machining time because the machining of a diameter larger than an area 13 is executed. In this way, as compared with the past, reduction of the machining time can be promoted when the area 13 is machined, and the desired machining can be efficiently performed.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention rotates a tool attached to the tip of a spindle around a single axis, and rotates the tool relative to a workpiece. This relates to a machine tool that performs machining while moving in the radial direction.

[Prior Art] Conventionally, in this type of machine tool, as shown in FIGS. 7 and 8, when performing pocket machining on a workpiece 1 whose final machining shape is circular, the tool 2, such as an end mill, is The first machining 3 is performed by moving the tool 2 toward the workpiece 1 in the axial direction while rotating the tool 2, facing the center position C of the machining shape, and then moving the tool 2 to the set cutting width S. Then, it is moved to a predetermined position 4 in the radial direction of the final machined shape, and a second process 5 is performed. Then, after performing the third machining 6 by relatively moving the tool 2 around the center position C, the tool 2 is moved to the predetermined position 7 in the radial direction in the same manner as described above, and the fourth machining is performed. Do step 8.

Further, the tool 2 is moved relatively around the center position C to perform a fifth machining 9 to obtain the desired final machining shape.

However, when the diameter of the tool 2 and the part to be machined have a relationship as shown in Fig. 9, if the machining progresses in the radial direction of the final machined shape with the set cutting width S from the center position C. , When moving the tool 2 to the predetermined position 10 after the fifth machining 9, in order to match the final machining shape, the tool 2 is moved below the final cutting width without moving by the cutting width S. [Move tool 2 and perform sixth machining 1
1 was to be processed.

[Problems to be Solved by the Invention] In the above-mentioned machine that performs machining by moving the tool by a set cutting width from the center position of the final machined shape,
If the R final cutting width is less than the above-mentioned cutting width, processing for that cutting width is performed at the outermost circumference where the processing distance is the longest, resulting in problems such as wasted processing time and poor processing efficiency. Ta.

[Object of the Invention] The present invention solves the above-mentioned problems, and aims to provide a machine tool that can shorten machining time and improve machining efficiency.

[Means for Solving the Problems] In order to achieve the above object, in the present invention, when machining is performed from the center position of the final machining shape by a set cutting width, the cutting width is A determining means is provided for determining whether or not machining less than the width is required, and a calculating means is provided for creating tool movement path data based on the result of the determining means, and the calculation results of the calculating means are stored. A control means is provided for controlling relative movement between the workpiece and the tool based on the stored contents of the storage means for controlling the workpiece and the tool.

[Function] With the above-described configuration, when it is determined by the determination means that machining that is less than the set cutting width is required in the machining of the outermost circumference, the calculation means determines the machining groove for machining that is less than the cutting width. The width is calculated to create tool movement path data, and the calculation result is stored in the storage means, and based on the stored contents of the storage means, the control means controls the machining of the machining groove width to the center of the final machining shape. After performing the machining on the position side, the relative movement between the workpiece and the tool is controlled so that the machining is performed in units of the cutting width.

[Embodiment] An embodiment embodying the present invention will be described below with reference to FIGS. 1 to 6.

The machine tool has a main shaft (not shown) attached to one end of a tool 2 such as an end mill rotatably supported, and a main shaft motor 20 (see FIG. 1) for rotationally driving the main shaft at the other end. connected. Further, a Z-axis motor 26 (see FIG. 1) is disposed near the main shaft to reciprocate the main shaft in the axial direction using a ball screw or the like. Furthermore, an XY table (not shown) on which the workpiece 2 is placed is located at a position facing the tip of the tool 2 mounted on the main shaft.
is provided so as to be movable in a direction orthogonal to the axis of the main shaft, and is moved to an arbitrary position by an X-axis motor 22 and a Y'NI motor 24 (see FIG. 1).

As shown in FIG. 1, the main shaft motor 20. The X-axis motor 22, the Y-axis motor 24, and the Z-axis motor 26 are connected to a central processing unit (hereinafter referred to as CPU) of a computer (not shown).
) 28, and a keyboard 30 for inputting various data is connected to the CPU 28.

Further, connected to the CPU 28 are an R0M 32 in which various control programs and the like are stored, and a RAM 34 in which data input from the keyboard 30 and the like are stored.

The present embodiment is constructed as described above, and the data creation method and processing method will be explained with reference to the flowchart of FIG. 2, taking as an example the case where the final processing shape is circular pocket processing.

When the power switch (not shown) of the machine tool is turned on and the machine is waiting for input of various data to perform the desired machining,
First, the CPU 28 executes a determination in step S1, and determines whether all the data necessary for machining, such as the final machining shape, the center position C1 of the machining, the cutting width K, and the diameter of the tool used for machining, have been input from the keyboard 30. Make a judgment.

If it is determined that all the data have been input in step S1, step S2 is executed next, and as shown in FIG. Tool 2 (for example, tool diameter D=
80> is moved to create data (x, y).

At this time, the actual movement ff1A of the tool 2 is A=DXK
/100.

In other words, the data created at this time is created assuming that the X coordinate is constant and the tool 2 is moved only in the Y-axis direction, and the outermost periphery of the final machining shape is machined based on the data of the final machining shape that has been set. The outermost circumference position a (100
, 150) and stored in a predetermined area of the RAM 34 (see FIG. 4).

Next, assuming that the tool 2 is moved by a predetermined width A toward the center position C (100,0>), the outermost circumferential position B (100,90) of the tool 2 is set as described above. Memorize it in the same way.

Furthermore, in the same manner, the outermost rotation position 11iffc (100
゜30) is memorized.

At this time, the CPU 28 makes a determination in step S3 every time each data a, b, c, etc.
100, -30)] is determined to be less than or equal to O, and the step S2 is repeated until it is determined to be less than or equal to O.

If it is determined in step S3 that the Y coordinate has become less than or equal to O, step S4 is executed and the data d
<100. -30) Data stored immediately before c (
Center position C (100, 30) based on the Y coordinate of
0> to the data c (100, 30) is calculated.

Next, by executing step S5 and determining whether the double value of the distance B is less than or equal to the tool diameter, it is determined whether or not the cleavage ff12B to be machined at the innermost circumference is less than or equal to the tool diameter. conduct.

If it is determined in step S5 that 2B≦D, step S6 is executed, and as shown in FIG. 22 and the Y-axis motor 24 are driven to position the workpiece 1, and the main shaft is operated by the main shaft motor 20 and the Z@ motor 26 to cause the tool 2 to make a predetermined cut at a position 12 shown by a chain line. Next, based on the data a and b stored in step $2, the Y[Nl motor 24 is operated to rotate the tool 2 around its axis, and the tool 2 is moved to a relatively predetermined position 15 [the outer periphery of the tool 2 is b]. ('1
00.90>].

At this time, the workpiece 1 is processed in a region 16 indicated by a chain line.

Next, XfiIil motor 22 and Y'F[! I motor 2
4 and rotates the tool 2 around the center position C (100,0) on one circumference relative to the workpiece 1, thereby machining the area 13 shown by the dashed line. executed.

Then, move the tool 2 to the predetermined position 17 [tool 2] in the same manner as described above.
By moving the outer periphery of the tool 2 to a (position facing 150, 100>), machining of the area 18 indicated by the dashed line is executed, and the tool 2 is further moved one circle above the workpiece 1 relative to the workpiece 1. By rotating and moving , machining of the area vA14 necessary for the final machining shape is executed.

That is, at this time, the machining corresponding to the width of the machining groove to be machined at the outermost periphery of the final machining shape is executed when the region Vi13 is machined.

Further, if it is determined in step S5 that 2B>D, step S7 is executed and, for example, as shown in FIG.
Drive the X-axis motor 22 and Y-axis motor 24 to position the workpiece 1 so that the outer periphery of the tool 2 is at a position facing C' (100, 50), and position the workpiece 1 with the tool 2 as the center in the same manner as described above. Predetermined position 40 eccentric to position C (100, O)
Cut into the specified amount. Next, move the tool 2 to the center position C (100
By rotationally moving on one circumference relative to the workpiece 1 with the center at .degree.

Furthermore, the tool 2 is moved to predetermined positions b' (100, 110> and a' (100, 170)), and machining of the area 42 and the area 44 that is in the final machining shape is executed.

As described above, in this example, the tool movement path data is created assuming that machining is performed from the outermost periphery of the final machining shape with the set cutting width, and based on that data, from the center side of the final machining shape. Since the machining is executed, the area VA1 is reduced compared to the conventional case where the machining shown in FIG. 5 is executed by the cutting width from the center position.
It is possible to shorten the machining time when machining 3.

In other words, when the center of the final machined shape is machined as in the conventional method, and the next process is executed by moving the tool with the set cutting width, the machine executes the process with a diameter larger than the area 13. Naturally, the longer machining distance requires additional machining time.

In addition, in this example, the machining m at the outermost periphery becomes larger than that of the conventional machining base, but it does not affect the machining in any way because it does not become larger than the set cutting width. .

For example, when machining as shown in Fig. 6 is performed in the conventional manner, if the tool is moved by the cutting width after machining the center position, the tool must be moved three times. Therefore, the number of times the tool is moved is one more than in the case of this embodiment, and obviously extra machining time is consumed.

In this embodiment, the final processed shape is circular as an example of pocket processing. However, the present invention is not limited to this, and may be applied to processing of a square shape, a track shape, etc. Needless to say, it can also be used.

[Effects of the Invention] As detailed above, in the present invention, when machining is performed from the center position of the final machining shape by the set cutting width, machining that is less than the cutting width at the outermost periphery is considered as the final machining. The tool's movement path data is created to be executed when machining the center position side of the shape, and the relative movement between the tool and the workpiece is controlled based on that data, so the desired machining can be performed. This has the effect of allowing the process to be carried out efficiently in a short period of time.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment embodying the present invention, and FIG. 2 is a diagram for explaining the operation of an embodiment of the present invention.
Figure 3 is an explanatory diagram showing the method for creating tool path data and determining the machining start position, Figure 4 is a schematic diagram showing the data storage contents, and Figures 5 and 6 show the actual machining method. 7 is an explanatory diagram showing a conventional pocket machining method, FIG. 8 is a sectional view showing the machining state of a workpiece, and FIG. 9 is an explanatory diagram showing a conventional pocket machining method. . In the figure, 1 is a workpiece, 2 is a tool, 28 is a CPU, and 34 is a RAM.

Claims (1)

[Claims] 1. Rotate the tool (2) attached to the tip of the spindle around one axis, and rotate the tool (2) to the workpiece (1).
In a machine tool that performs machining while moving the tool (2) in the radial direction relative to the determination means (28) for determining whether machining less than the cutting width is required;
), and when it is determined by the determination means (28) that machining that is less than the cutting width is required, the machining groove width for machining that is less than the cutting width is calculated, and the machining of the machining groove width is performed in the final machining. a calculation means (28) for creating movement path data of the tool (2) so as to perform processing by the cutting width after processing the center position side of the shape; A storage means (34) for storing calculation results, and a workpiece (1) based on the memory contents of the storage means (34).
) and the tool (2), a control means (
28) A machine tool comprising: 2. The determining means (28) assumes that the tool (2) is moved from the outermost circumference toward the center position so as to perform machining by the cutting width from the outermost circumference of the final machined shape, and 2. The machine tool according to claim 1, wherein the determination is made by comparing the diameter of the machined shape to be machined on the periphery with the tool diameter.