JPH0616978B2 - 4-axis simultaneous machining generation method in automatic programming - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to a single workpiece when machining four-axis workpieces such as a shaft shape to be machined on the outer diameter using automatic programming of a numerical control (NC) lathe. On the other hand, the present invention relates to a 4-axis simultaneous machining generation method in automatic programming for automatically creating 4-axis simultaneous machining data such as machining range division and tool information by a single machining information input operation.

(Technical Background of the Invention and Problems Thereof) The majority of shaft-shaped workpieces do not require inner diameter cutting and only perform outer diameter cutting. Fig. 3 (A) shows an example of a work that only performs such outer diameter cutting. When performing 4-axis simultaneous machining on this work using an NC lathe, etc. There is a method of dividing a machining range in the axial direction and simultaneously machining the divided machining ranges. However, this machining range is a machining process that can be set at one time as one machining process that is normally performed with one tool, but since there is no other suitable machining process that performs simultaneous machining, the operator has to Judgment is made, the machining data of the same tool etc. is set as a partner of simultaneous machining, and the machining range is divided and set.If each machining range is a completely different cutting part, input must be specified. In addition, the input operation is troublesome for the operator, and it takes a lot of time.

(Object of the invention) The present invention has been made in the above-mentioned circumstances, and an object of the present invention is to perform a single machining such as a shaft shape for performing an outer diameter cutting process using automatic programming of an NC lathe. 4 workpieces that can be set at one time as one machining process
When the axes are simultaneously machined, the machining range of the work is automatically divided by the operator's one-time machining information input operation for one work, and the machining data for each machining range is set. It is to provide a 4-axis simultaneous machining generation method in automatic programming for automatically generating 4-axis simultaneous machining data of.

(Summary of the Invention) The present invention relates to a 4-axis simultaneous machining generation method in automatic programming using a numerically controlled lathe, and uses the automatic programming function of the numerically controlled lathe to simultaneously perform 4-axis simultaneous machining data of a workpiece to be subjected to outer diameter cutting. When automatically generating
Based on the work shape, the material shape, and the tool data input to the numerically controlled lathe, for all the convex corner points excluding both end points and all the concave corner points among all the work shape points indicating the above work shape, Assuming a line of a predetermined angle according to the cutting edge angle of the tool, the work shape points that do not intersect with the work shape between the intersection points where the lines intersect the material shape and the convex corner points Of the selected work shape points, the work shape point closest to the center of the work shape in the longitudinal axis direction is used as the division point to divide the work shape machining range, and each of the divided machining ranges is divided. The 4-axis simultaneous machining data is automatically generated for each.

(Embodiment of the Invention) FIG. 1 is a block configuration diagram showing an outline of a control device of an NC lathe to which a 4-axis simultaneous machining generation method in automatic programming of the present invention can be applied. In FIG.
The display 1 including a CRT display device displays a machining program, data, etc., and also displays guidance for various data input operations, and the keyboard 2 shows the work shape, material shape, tools used (blade angle, tool number, etc.) and cutting. It is used when inputting processing information data such as conditions. The input control unit 3 reads various data input from the keyboard 2, displays the data on the display 1, and outputs the data to the input data storage unit 4. The input data storage unit 4 is output from the input control unit 3. Stores various data. The division point setting unit 5 automatically sets points (division points) for dividing the machining range in the longitudinal axis direction of the work based on the work shape and the material shape data among the various input data as described later. To do. The shape division setting unit 6 sets a division line of a processing range described later by the division points set by the division point setting unit 5, and sets each processing range divided by the division line as an independent processing range. Set the work shape, material shape, tool information and cutting conditions. The division data storage unit 7 stores data such as a work shape, a material shape, tool information used and cutting conditions for each processing range set by the shape division setting unit.

Referring to the flowchart shown in FIG. 2, the 4-axis simultaneous machining generation method in the automatic programming of the present invention for a workpiece as shown in FIG. Will be described below.

In the method of the present invention, the operator checks the display 1 while confirming the machining information of the work W1 as shown in FIG. 3 (A) (the coordinate values of the points P1, P2, ..., P7 indicating the work shape data, the material shape). Inputting the coordinate values of points P1, P8, P7 indicating the data and the blade angle of the tool T used) from the keyboard 2,
These processing information data are stored in the input data storage unit 4 by the input data control unit 3 (step S1). Therefore, the division point setting unit 5 sequentially reads the points P1, P2, ..., P7 indicating the work shape data in the machining information (step S2).
~ S3), the read work shape points are determined as follows and the machining range dividable points are set.

First, if the sequentially read work shape points P1 to P7 are the first work shape point P1 or the last work shape point P7, which are the end points of the work, the work shape points P1 and P7 cannot be division points. Therefore, the process returns to step S2, the next work shape point is read, the same work is performed, and the other work shape points P2 to P6 are selected as dividable points (step S
Four).

Next, of the workpiece shape points P2 to P6, the concave points P2 and P6
Since 4, P6 is not appropriate as the above division point, the above step
Returning to S2, the next work shape point is read and judged in the same manner, and the other work shape points P3 and P5 are selected as dividable points (step S5).

Further, as shown in FIG. 4 (A), assuming a line IT of an angle θ ′ with a margin of about 5 ° with respect to the cutting edge angle θ of the tool T to be used, as shown in FIG. 4 (B). For the lines lT3 and lT5 passing through the work shape points P3 and P5 selected in the above steps S4 and S5, it is determined whether or not there is an interference point with the work shape W1 between the intersection with the material shape M1 (step
S6).

Here, in the case of the shape point P20 of the work W2 as shown in FIG. 4 (C), it is selected as a dividable point in steps S4 and S5, but the line lT20 passing through this work shape point P20 is assumed. Then, this line lT20 is the material shape
Since there is an interference point PW20 with the workpiece shape W2 between the intersection point PP20 and M2, this workpiece shape point P20 cannot be the dividable point to be obtained. On the other hand, as shown in FIG. 4 (B), lines lT3 and lT5 passing through the work shape points P3 and P5 have intersection points PP3 and PP5 with respect to the material shape M1, respectively, and a work shape W1 between them. Since there is no such interference point, the work shape points P3 and P5 are set as the dividable points (step S7).

When the steps S2 to S7 are repeated to set the dividable points for all the work shape points P1 to P7, the division point setting unit 5 is set as described above as shown in FIG. 4 (D). Of the dividable points P3 and P5, the point closest to the center of the outer diameter machining range P1 to P7 in the longitudinal axis direction of this work shape W1
P5 is obtained (step S8), and this work shape point P5 is set as the machining range division point of this work W1 (step S8).
9). Therefore, as shown in FIG. 3 (B), the shape division setting unit 6 assumes the line lT5 passing through the machining range division point P5 and sets it as the division line lT5.
The workpiece shape data P1 to P7 and the material shape data P1, P8, P7 are divided and set as shown in FIG. 4 (E), with the processing ranges W11 and W12 divided at T5 as independent processing ranges. . In addition, the tool information such as the cutting edge angle of the tool T to be used and various conditions such as cutting conditions are also set in the above processing ranges W11 and W.
The divided shape processing information data is divided and set for each 12 and set in the divided data storage unit 7 (step S1).
0).

In the above-described embodiment, the example in which the operator inputs the machining information such as the work shape by operating the keyboard is shown, but the data automatically determined by another control device or system is transferred and input. You may do it.

(Effect of the Invention) As described above, according to the 4-axis simultaneous machining generation method in the automatic programming of the present invention, the operator conventionally sets a machining range division point in advance, and for each machining range divided by this division point. Simultaneous 4-axis machining of a workpiece that has only entered the outer diameter, for which each machining condition has been entered, is automatically optimized from the data of the workpiece shape, material shape, tools used, machining conditions, etc. entered in one operation. Since the simultaneous machining data is generated, the time required to create the 4-axis simultaneous machining program can be significantly reduced and the burden on the operator can be reduced.

[Brief description of drawings]

FIG. 1 is a block diagram showing an example of an apparatus to which the method of the present invention can be applied, FIG. 2 is a flow chart for explaining the operation of the simultaneous machining generation method of the present invention, and FIGS. 3 (A) and 3 (B).
And FIGS. 4 (A) to 4 (E) are diagrams showing an example of a work and division point determination method for explaining the simultaneous machining generation method of the present invention. 1 ... display, 2 ... keyboard, 3 ... input control section, 4 ... input data storage section, 5 ... division point setting section,
6: Shape division setting section, 7: Division data storage section, P1 ~
P7, P20, P1 'to P7' ... Work shape point, P1, P8, P7, PP5, P
1 ′, P8 ′, PP5 ′ …… Material shape point, W1, W2 …… Material shape, W11, W12 …… Machining range, M1, M2 …… Material shape, T ……
Tool used.

Claims (2)

[Claims] 1. Machining data for simultaneous 4-axis machining by two turrets using the automatic programming function of a numerically controlled lathe for contour cutting of a workpiece that can be machined in a single machining step with one tool in one turret. In the automatic generation of
Of the dividable work shape points that match the cutting edge angle line of the tool by one input operation of machining information such as work shape data, material shape data and tool data, the work shape near the central part in the longitudinal axis direction of the work. A point is automatically set as a division point of the machining range, and machining data for each of the different tool rests is set for each of the divided machining ranges. Method. 2. The division of the machining range is carried out for all convex corner points excluding both end points and all concave corner points out of all workpiece shape points showing the workpiece shape, to the cutting edge angle of the tool passing through each convex corner point. Assuming lines with a predetermined angle according to each of them, a work shape point that does not intersect with the work shape between each intersection point where each line intersects the material shape and each convex corner point is selected, and this is selected. The automatic programming according to claim 1, wherein the work shape point closest to the center of the work shape in the longitudinal axis direction is used as the dividing point to divide the machining range of the work shape. 4 axis simultaneous machining generation method in.