JPS62130150A - Method of preparing program for rough-grinding process based on digitized data - Google Patents

Abstract

PURPOSE:To aim at automating the machining operation consistently from a rough grinding step to a copy-machining step, by synthesizing a predetermined milling locus and a copy-machining locus to prepare a rough-grinding process program. CONSTITUTION:A digitized data process section 2 samples coordinates of a copy-machining locus TA which is delivered from a copy machining control section 1, and delivers the thus sampled coordinates to a milling cycle program generating section 4. Meanwhile, data TB of milling cycle locus for roughly grinding a workpiece along the horizontal plane of a copy model are stored in a milling locus memory 3, and the data are delivered to the generating section 4. This milling cycle program generating section 4 synthesizes the coordinates of the copy-machining locus TA and the data TB of the milling cycle locus. Further, a new rough-grinding locus TC surrounded by the locus TA and the locus TB is set. With this arrangement it is possible to consistently and automatically carry out the rough-grinding step to the copy-machining step of a workpiece, thereby it is possible to greatly reduce the time of machining.

Description

[Detailed Description of the Invention] (Technical Field of the Invention) This invention uses digitized data (copying trajectory g4) obtained by copying a model shape with a copying device, and a preset rough machining trajectory by a milling cutter. This invention relates to a method for creating a rough cutting program using digitized data for automatic light cutting using prices that is performed prior to actual copying.

(Technical background of the invention and its problems) Conventionally, when performing copying processing using digitized data, as is well known, the model shape is copied by a copying device, and the coordinate values ( A machine program is created using the machine data (digitized data), and machining is automatically performed according to this machine program. However, if the workpiece is directly machined using this data, depending on its shape, the processing machine may not be able to handle it. Since this is a heavy burden, prior to this profiling, rough machining is performed using, for example, a drill or milling cutter to roughly follow the shape of the model.

However, in order to automatically perform the above-mentioned rough machining, a tracing device is used to approach the model with a tracer each time a rough machining cycle is performed using a drill or milling cutter, and the coordinate values are digitally recorded each time. ing and then creating a rough cutting program based on this digitized data, which is not practical as it takes a lot of time. Therefore, in reality, workers manually operated processing machines such as drills and milling machines to perform rough cutting that followed the approximate shape of the model, but in such manual operations, only the approximate shape of the model was processed. In addition to not being able to perform rough machining, the entire profiling process could not be automated, which was a major problem.

(Object of the invention) This invention was made under the above circumstances,
An object of the present invention is to provide a method for creating a rough cutting program using digitized data, which enables automatic rough cutting using a milling cutter prior to copying.

(Summary of the Invention) The present invention relates to a method for creating a rough cutting program using a milling cutter, in which predetermined milling I! A mark is set, and when copying the model shape with the copying device, measure the coordinate points of the trajectory formed outside the model shape by the predetermined milling trajectory and the copying trajectory, and perform the above measurement. Using the determined coordinate points, an NG program is created that can automate rough cutting using a milling cutter.

(Embodiment of the Invention) In the method of creating a rough cutting program using digitized data of the present invention, a locus for rough machining is set in advance using a milling cutter, and the copying device digitizes the locus of copying after copying the model shape. The data and the rough machining trajectory described above are combined to create a rough machining reprogram using digitized data using a milling cutter.

FIG. 1 is a block diagram schematically showing a rough cutting program creation apparatus to which the rough cutting program creation method using digitized data of the present invention can be applied. When creating a rough cutting program that copies the shape of the semi-cylindrical model 50 as shown in the same figure, the copying control section 1 is controlled by the following: A tracer 51 is brought into contact with the surface of a model 50 made of a mold, and traced along a predetermined path on the X-Y plane while keeping its Z coordinate value constant, as shown in FIG. 2(A). The tracing trajectory T^ (digitized data), that is, the coordinate values (x++!j+z+'') of the model surface are collected. Then, as shown in FIG. 4(A), after collecting the tracing trajectory data regarding the above one Z coordinate value, the next Z coordinate value, which is the depth of cut, is shifted by the big feed amount Pf.
(pick feed) and trace this Z coordinate value along a predetermined path on the XY plane as described above,
(Z vehicle copying limit that has been set in advance)
By repeating the process up to L2, the tracing locus, that is, the digitized data, is collected over the entire surface of this model 50.

The digitizing data processing 8'II2 is the above-mentioned copying control section l.
The coordinate value of the tracing trajectory ↑^ output from (!1゜!j
+Zi j ) is sampled and output to the milling cycle program generating section 4. On the other hand, the milling trajectory memory 3 is used to perform rough cutting using a milling cutter (keeping the Z coordinate value constant) along the water surface (X-Y plane) of this model shape as shown in FIG. 2(B). Trajectory data Ta of the milling cycle to be machined (preset by an operation unit not shown) is stored, and the data is output to the milling cycle program generating section 4.

Here, trajectory data τB of this milling cycle
There are four patterns in which the machining directions are in both forward and reverse directions along the X-axis and Y-axis, respectively, and the data of these four patterns and the machining trajectory TC of the rough cutting program described later are as shown in Figure 4 (C). Data on the milling return position 22sr, the machining end position Se, and the machining pitch bottle Pt are also stored in the milling locus memory 3. The milling cycle program generation 'rA4 includes the coordinate values (Xi, Y'', 2nd position) of the tracing trajectory TA output from the digitizing data processing section 2 and the milling cycle stored in the milling trajectory memory 3. trajectory data τ
As shown in FIG. 4(C), this milling cycle locus data T8 can form a model shape for the workpiece 6 as shown by the broken line in FIG. The locus TO of this milling cycle as shown in (C) and 1. A new rough machining locus TC surrounded by the memorized tracing locus T^ is set, and a rough machining program is created.

A method of creating a rough cutting program by milling using the rough cutting program creating apparatus having such a configuration will be described below with reference to the flowchart shown in FIG.

When creating a rough cutting program using the digitized data of the present invention, first, from the position of the workpiece, the above-mentioned milling return position Sr, machining end position Se, machining pitch Hkpt, and the above-mentioned 4 patterns in 7 rice cycles for rough machining are determined. Set the pattern for processing this model using a keyboard, etc. (not shown).
- Create locus data B of the milling cycle, store it in the milling locus memory 3, and output it to the milling cycle program generator 4 (step Sl)
, On the other hand, as shown in Fig. 4 (A), set the big feed amount Pf in the Z-axis direction and the Z-axis scanning limit y)Lz,
Stored in the copying control unit 1 (step S2), where:
The copying control unit l causes the copying device 5 to copy the outline of the model 50 shape along the X-Y plane with the Z coordinate value constant (step S3), and traces the tracing trajectory T^ of X, Y,
The Z coordinate value is collected in the digitized data processing section 2 and outputted to the milling cycle program generation section 4. Therefore,
The ox milling cycle program generating section 4 generates the tracing trajectory T^ output from the digitizing data processing section 2.
By combining the X, Y, and Z coordinate values (digitized data) of the milling cycle with the milling cycle trajectory data T8 stored in the milling trajectory mortar 3, as shown in FIG. In other words, the locus data τB of this milling cycle is surrounded by the locus to of this milling cycle and the locus of tracing 〒A as shown in FIG. Set a new rough machining trajectory ↑C to create a rough machining program (step S4), and then repeat digitizing until all coordinate points of the milling cycle trajectory at this constant Z coordinate value are completed. , after collecting digitized data of all coordinate points of the locus of the milling cycle at the constant Z coordinate value, the pick feed FJ
P Big feed step S along the Z axis by r
5) Return to the above step S3 until the pick-fed Z coordinate value reaches the Z-axis copying limit L7, collect the digitized data mentioned above, slightly return to creating the light removal program using the milling cutter, and set the Z-axis copying limit Ll. At step S6), the entire surface of the model shape is digitized to create an NC program for the milling roughing cycle, and the creation of the roughing program using this digitized data is completed.

FIG. 5 shows an example of a machining situation by the milling cutter 80 when a rough cutting program is executed using the digitized data thus created.

According to the machining trajectory TC by this milling roughening program as shown in FIG. 4(C), the workpiece 6 is automatically rough-machined into a shape roughly following the predetermined model shape.

(Effects of the Invention) As described above, according to the method of creating a rough cutting program using digitized data of the present invention, the milling trajectory can be set by setting the milling trajectory for the model in advance and simply executing the tracing of the model. The trajectory is corrected according to the model shape, and a rough cutting program can be automatically created. By using a rough cutting program based on this digitized data, it is possible to consistently automate everything from rough cutting to copying machining, which not only shortens machining time but also enables significant labor savings.

[Brief explanation of drawings]

FIG. 1 is a block diagram schematically showing a rough cutting program creation device to which the present invention can be applied, and FIG. 2 (A
) to (G) are diagrams showing trajectories output from each component in FIG. 1, and FIG. 3 is a flowchart explaining a method for creating a rough cutting program using digitized data of the present invention.
FIGS. 4(A) to 4(C) are diagrams for explaining this invention,
FIG. 5 is a diagram illustrating the rough cutting operation according to the present invention. DESCRIPTION OF SYMBOLS 1... Copying control section, 2... Digitizing data processing section, 3... Milling locus memo 1c 4... Milling cycle program generation section, 6... Workpiece, 50
...Model, 51...Tracer, 60...Milling cutter. Applicant's agent Yu Yasugata Sancha 2 Tsutsuri 3

Claims (1)

[Claims] A predetermined milling trajectory along the horizontal plane of the model shape is set in advance, and when the model shape is copied by a copying device, a shape is formed outside the model shape using the predetermined milling trajectory and the copying trajectory. 1. A method for creating a rough cutting program using digitized data, characterized in that the coordinate points of a trajectory are measured, and the measured coordinate points are used to create an NC program for rough cutting by a milling cutter.