JPH05173622A - Numerical control data generation device - Google Patents

Abstract

PURPOSE:To shorten the time of data editing operation by an operator and to prevent error data from being generated owing to misoperation by automatically generating replacement machining data which enables proper machining. CONSTITUTION:Machining shape data MD are inputted to a machined surface gradient decision means 4 through a machining shape data/machining condition data input means 11 and when the shape (gradient) variation extent CD of a machining shape surface group shown by machining shape surface data MF1 and MFr, i.e., the direction of the axis of rotation of a tool is perpendicular, the result of a decision on which of the left and right side a steep slanting surface having a large angle to a horizontal surface in a left and a right machining shape surface group constituting a recessed ridge line is on is sent out to a pick order determining means 5. Cross line machining data CK on the other hand, are sent out of a cross line machining data generating means 2 to the pick order determining means 5 and pick order data PD' among the machining condition data KJ are also sent out to the pick order determining means 5 through the machining shape data/machining condition data input means 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention creates machining trajectory data representing a tool trajectory from machining shape data representing a machining shape and machining condition data representing machining conditions for machining the machining shape, and the machining trajectory. The present invention relates to a numerical control data creating device that converts data to create numerical control data.

[0002]

2. Description of the Related Art FIG. 4 is a block diagram showing an example of a conventional numerical control data generating device. For example, the machining shape surface data MFl, MFr and those forming concave ridge lines included in the machining shape as shown in FIG. Of the machining shape data MD consisting of the ridge line data ME indicating the effective range of the machining data and the machining condition data KJ consisting of the machining tool data TL and the pick order data PD through the machining shape data / machining condition data input means 1 It is input to the means 2. In the intersecting line machining data creation means 2, based on the machining shape data MD and the machining condition data KJ, the intersecting line machining data CK (CK ₁ , CK ₂ , ...,), which is a plurality of machining locus data along the concave ridge line.
CK _{i, ...,} is transmitted to the _{CK n-1, CK n)} is created numerical control data conversion means 3. The created intersecting line machining data CK is arranged in only one direction specified by the pick order data PD in the machining condition data KJ. Then, the numerical control data conversion means 3 converts the intersecting line machining data CK into numerical control data NC and outputs it.

[0003]

In the above-mentioned conventional numerical control data generating apparatus, the picking order is always determined in one direction regardless of the machining shape. Therefore, for example, when the rotation axis direction of the tool is vertical as shown in FIG.
When the picking order is from a gentle slope with a small angle to the horizontal plane to a steep surface with a large angle to the horizontal plane, the tool load becomes large during machining of the steep slope and the cutting speed cannot be increased. Since the amount of processing is increased, the tool may be pulled in on the steep slope side and the processed shape may be cut. Therefore, the operator of the numerical control data creation device divides the machining range so as to reduce the tool load and partially creates the intersecting line machining data and then collects it later, or for the time being, creates the intersecting line machining data for the entire machining range. There was a problem that I had to edit the pick order sequence later. The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a numerical control data creating apparatus for automatically creating machining trajectory data in a picking order, which enables optimum machining depending on a machining shape. To do.

[0004]

According to the present invention, machining locus data representing a tool locus is created from machining shape data representing a machining shape and machining condition data representing machining conditions for machining the machining shape. The present invention relates to a numerical control data creating device that creates a numerical control data by converting working locus data, and the above object of the present invention is to calculate a gradient of a working shape surface group forming a concave ridge line included in the working shape. Determination means for determining a degree of change based on the concave ridge line, and determination means for determining a picking order of intersecting line machining data, which is a plurality of machining locus data along the concave ridge line, according to the determination result of the determining means. It is achieved by having.

[0005]

According to the present invention, by recognizing the shape (gradient) of the machined surface group forming the concave ridgeline included in the machined shape, shaving is less likely to occur and the tool load is small and variation is small during machining. Since the picking order is automatically determined, it is possible to efficiently create numerical control data.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram showing an example of the numerical control data generating apparatus of the present invention in correspondence with FIG. 4, and the same components are designated by the same reference numerals and the description thereof will be omitted. The machining shape data MD is input to the machining surface gradient determination means 4 via the machining shape data / machining condition data input means 1 and the shape (gradient) of the machining shape surface group represented by the machining shape surface data MFl, MFr.
Degree of change CD, that is, when the rotational axis direction of the tool is set to the vertical direction, it is determined whether the steep slope having a large angle with the horizontal plane is on the right side or the left side among the left and right machined surface groups forming the concave ridgeline. The result is sent to the pick order determining means 5. On the other hand, the intersecting line machining data CK is sent from the intersecting line machining data creating means 2 to the pick order determining means 5, and the pick order data PD ′ in the machining condition data KJ is also processed via the machining shape data / machining condition data input means 1. It is sent to the pick order determining means 5. In the apparatus of the present invention, unlike the conventional apparatus, the pick order suitable for machining is automatically determined. Therefore, the pick order data PD 'here is used for provisional determination. Then, the pick order determining means 5 selects an appropriate pick order based on the shape (gradient) change degree CD of the processed shape surface group and the pick order data PD ′, that is, from a steep slope to a gentle slope. It is determined whether or not there is any, and if the determination result is appropriate, the intersecting line machining data CK is as it is, the numerical control data conversion means 3
When the determination result is inappropriate, the pick order data PD ′ of the intersecting line machining data CK is rearranged (pick order is reversed), and the rearranged intersecting line machining data C is changed.
K ′ is sent to the numerical control data conversion means 3.

An example of the operation in such a configuration will be described with reference to the flowcharts of FIGS. 2 and 3. The machined surface gradient determination means 4 inputs the machined shape data (step S
1) The left and right steep slope counters Kl and Kr are set to zero in order to obtain the degree of change in the shape (gradient) of the left and right machined surface groups forming one concave ridge line included in the machined shape (step S2). Next, check sampling points Pi for determining the steep slope on the concave ridge are sequentially obtained (step S3), and the point P
Find points Pli and Pri on the processed shape surface corresponding to i,
Further, the surface normal vectors Nl and Nr of the machined surface at the points Pli and Pri are obtained (step S4). Then, the angles θl and θr formed by the surface normal vectors Nl and Nr with respect to the horizontal plane are obtained (step S5), the magnitudes of the angles θl and θr are compared (step S6), and the surface with the smaller angle is the steep slope. The steep slope counter Kl or Kr on that side is incremented by +1 (step S7 or S8). It is confirmed whether or not the processing up to this point has been performed for all the check sampling points Pi on the concave ridge (step S9), and the processing of steps S3 to S9 is repeated until the processing for all the check sampling points Pi on the concave ridge is completed.

On the other hand, if the processing is completed for all the check sampling points Pi on the concave ridge line, the magnitudes of the steep slope counters Kl and Kr are compared (step S10), and the side having the larger counter value is recognized as the steep slope side. (Step S11 or S12). The picking order determining means 5 combines the degree of change in the shape (gradient) of the machined surface group from the machined surface gradient determining means 4 and the picking order data PD ′ from the intersecting line machining data creating means 2 with the recess currently being processed. It is determined whether or not the temporary picking order of the intersecting line processing data corresponding to the ridge is an appropriate picking order (step S13 or S14). And
If the temporary picking order is not appropriate, the picking order of the intersecting line machining data corresponding to the concave ridge line currently being processed is reversed, and the processed intersecting line machining data is stored (step S15).
On the other hand, if the temporary picking order is appropriate, the picking order of the intersecting line machining data corresponding to the concave ridge currently being processed is stored as it is (step S16). Then, it is confirmed whether or not the processing has been completed for all the concave ridge lines within the processing range specified by the processing condition data (step S1).
7) If the processing is not completed, the process returns to step S1 to repeat the above-described processing, and if the processing is completed, all the processing is ended.

In the above-described embodiment, the method of rearranging the picking order of the intersecting line machining data according to the degree of change in the shape (gradient) of the machined surface groups on the left and right of the concave ridge line to be machined is as follows.
The case of only one direction from the left side to the right side or the right side to the left side was explained, but the shape (gradient) of the left and right machined surface groups
By investigating the degree of change in more detail and automatically selecting from multiple types of rearrangement methods, such as rearranging the picking order of intersecting line machining data alternately with the left side and the right side, a pick that is more suitable for the shape (gradient) change state You may make it rearrange in order. Also, since the picking order is automatically determined in the apparatus of the present invention, it is not necessary to always input the temporary picking order data as the processing condition data, but it is necessary to store it as the eigenvalue data in the apparatus in the eigenvalue storage means. At any time, provisional pick order data may be sent from the eigenvalue storage means to the machining shape data / machining condition data input means 1 or directly to the intersecting line machining data creation means 2 or the pick order determination means 5.

[0010]

As described above, according to the numerical control data creating apparatus of the present invention, it is possible to automatically create intersecting line machining data capable of more appropriate machining, so that it is possible to reduce the data editing work time by the operator. In addition to being able to shorten the length, it is possible to prevent the generation of erroneous data due to an operator's operation error or the like, and always perform good processing.

[Brief description of drawings]

FIG. 1 is a block diagram showing an example of a numerical control data creation device of the present invention.

FIG. 2 is a flowchart illustrating an operation example of the device of the present invention.

FIG. 3 is a partial diagram of FIG.

FIG. 4 is a block diagram showing an example of a conventional numerical control data creation device.

FIG. 5 is a first diagram for explaining a conventional problem.

FIG. 6 is a second diagram for explaining a conventional problem.

[Explanation of symbols]

 4 Processing gradient determining means 5 Pick order determining means

Claims (1)

[Claims] 1. Machining locus data representing a tool locus is created from machining shape data representing a machining shape and machining condition data representing machining conditions for machining the machining shape.
In a numerical control data creation device that creates numerical control data by converting the processing locus data, the degree of change based on the concave ridge line is calculated by calculating the gradient of the processed shape surface group forming the concave ridge line included in the processed shape. Determination means for determining
A numerical control data creating apparatus, comprising: a determining unit that determines a picking order of intersecting line machining data that is a plurality of machining trajectory data along the concave ridge line according to the determination result of the determining unit.