JPH06179150A - Nc data perparation for corner part - Google Patents

Abstract

PURPOSE:To shorten the prepapration time and shorten the working time, according to the prepared NC data. CONSTITUTION:An NC data preparating method is equipped with a process S1 for instructing the base bottom shape, process S2 for calculating the left quantity to be cut at each corner part in the forestage work, process S4 for determining a tool used in the work for each corner part on the basis of the left quantity to be cut, process S5 for detecting an imperfectly worked corner part where working is not yet completed on the basis of a previously set allowable value and the left quantity to be cut, and a process S6 for determining the tool path on the basis the left quantity to be cut at each imperfectly worked corner part. Then, the processes ranging from the process S3 for calculating the left quantity to be cut to the process S7 for determining the tool path are repeated until the left quantity to be cut at each imperfectly worked corner part is set within the allowable value.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of creating NC data by a CAD / CAM device, particularly NC data for performing a pawl machining of a corner portion.

[0002]

2. Description of the Related Art To create NC data for machining a corner part, NC data peculiar to a corner part different from the base shape is created, or an extra figure is edited to reselect the same shape many times. It is necessary to calculate the uncut amount of the corner each time and specify the tool to be used each time.

[0003]

Therefore, in the conventional NC data creating method for the corner portion as described above, it is necessary to add extra data, edit a figure, and repeatedly select the same shape, which requires a long time. Was. In addition, when performing the pawl machining of the corner portion, it is difficult to incorporate the selection of the tool as one of the machining processes, the machining procedure differs depending on the skill of the operator, and the finishing accuracy of the workpiece is not uniform. The current situation.

The present invention was devised in view of the above circumstances, and it is possible to reduce the creation time and, at the same time, to reduce the machining time according to the created NC data in the corner NC. It is intended to provide a method for creating data.

[0005]

A method for creating NC data of a corner portion according to the present invention is a step of instructing a base shape, a step of calculating an uncut amount of a corner portion in a previous step of working, and the uncut portion. A step of determining a tool to be used for machining the corner portion based on the amount, a step of detecting the machining incomplete corner portion that has not been machined based on the preset allowable value and the uncut amount, and It has a step of determining a tool path based on the uncut amount in the unfinished machining corner portion, and from the step of calculating the uncut amount until the uncut remaining amount in the unfinished machining corner portion falls within an allowable value. The process of determining the tool path is repeated.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the corner portion N according to an embodiment of the present invention.
FIG. 2 is a flow chart of a C data creating method, FIG. 2 is a schematic configuration diagram of hardware for executing the NC data creating method of the corner portion, FIG. 3 is an explanatory diagram showing an example of a base shape, and FIG. FIG. 5 is an explanatory diagram showing data, FIG. 5 is an explanatory diagram showing an example of a process file for machining a corner portion, and FIG. 6 is an output example of NC data created by the NC data creating method of the corner portion.

In the following description, five corner portions 300 to 304 of a polygonal base shape 100 as shown in FIG.
NC data for processing is to be created.

In the method for creating the NC data of the corner portion according to this embodiment, the step of instructing the base shape 100 (see S _{1 in} FIG. 1) and the uncut amount of each of the corner portions 300 to 304 in the machining in the previous stage are set. A step of calculating (see S _{2 in} FIG. 1) and a step of determining a tool to be used for machining each of the corner portions 300 to 304 based on the uncut amount (see S _{4 in} FIG. 1) are preset. a step of detecting the machining uncompleted corner machining is not completed on the basis of said uncut amount permissible value (see S ₅ in FIG. 1), the tool path based on the amount of uncut in the processing uncompleted corner And a step (see S _{6 in} FIG. 1) for determining the uncut amount until the uncut amount in the unfinished machining corner portion falls within an allowable value (see S _{3 in} FIG. 1). To the step of determining the tool path (see S _{7 in} FIG. 1) are repeated. Growling.

First, the material to be cut is selected and the machining origin is set.
Indicate 100 (see S _{1 in} FIG. 1). That is, the data regarding the base shape 100 is written and registered in the base shape storage device 202.

Next, the permissible value of each of the corner portions 300 to 304 is input (see S _{2 in} FIG. 1). This allowable value is a value that serves as a reference for completion of machining of each of the corner portions 300 to 304, and if the uncut amount is equal to or less than the reference value, the machining is considered to be completed.

Next, the corner portion 300 in the machining in the previous stage
The uncut amount is calculated (see S _{3 in} FIG. 1). The calculation of the uncut amount is performed by the uncut amount calculating unit 203 as follows (see FIG. 4). First, the radius 140 of the last used tool used in the previous stage machining is determined from the NC data used in the previous stage process. The fillet arc 110 of radius 140 of this end-use tool is fitted to the corner portion 300. A straight line goes from the center point 170 of the fillet radius 110 to the midpoint 160 of the arc 180 of the corner section 300.
190 to form the intersection of straight line 190 and fillet arc 110
Ask for 150. This intersection 150 and the midpoint 160 of the arc 180
The distance 130 between and is the amount left uncut. The NC data used for the machining in the previous stage is given from the NC data storage device 204 in the pre-machining to the uncut amount calculating unit 203.

Similarly, the remaining four corner portions 301 to 30
Calculate the uncut amount of 4.

The tool determining unit 205 determines the optimum tool and the overlapping machining distance 120 based on the uncut amount (see S _{4 in} FIG. 1). The optimum tool and the overlapping machining distance 120 are determined in advance according to the size of the uncut amount, and the various data are stored in the machining process storage device 206 in the format shown in FIG. In addition,
The overlapping machining distance 120 is a distance in a range in which a portion that has already been machined in the machining in the previous stage is machined again. Here, as shown in FIG. 4, the overlapping machining distance 120 is set on a straight line in contact with the fillet arc 110, that is, a straight line portion of the base shape 100.

Next, the corner detection section 207 detects the unfinished machining corner (see S _{5 in} FIG. 1). The detection of the unfinished corner portion is performed as follows. First, the corner detection unit 207 compares the allowable value with the uncut amount. As a result of this comparison, a corner portion having an uncut amount larger than the allowable value is detected as a machining target, that is, a corner portion that has not been machined. That is,
If the uncut amount is smaller than the permissible value, new processing is not necessary and therefore it is not detected as a processing target.

NC data is created in the NC data generator 208 only for the unfinished corners detected in the preceding step (step S ₅ for detecting unfinished corners) (see S _{6 in} FIG. 1). ). This NC data is determined as a tool path on the basis of the uncut amount in the unfinished machining corner portion and various data of the optimum tool selected in the step S ₄ of determining the tool to be used, which is the previous step. The created NC data is stored in the NC data storage device 209.

NC for all unfinished corners
Until the data is formed, the step S ₅ of detecting the unfinished corner portion to the step S ₇ of creating the NC data are repeated. Further, until the amount of uncut in all corners becomes less than the allowable value, is repeatedly performed from calculation step S ₃ of uncut amount before step S _7.

NC data for each of the corner portions 300 to 304 can be created through the steps described above. Such NC data is output as a tool path as shown in FIG.

[0018]

The NC data creating method for the corner portion according to the present invention is based on the step of instructing the base shape, the step of calculating the uncut amount of the corner portion in the machining in the previous stage, and the uncut amount. A step of determining a tool to be used for machining a corner portion, a step of detecting a machining incomplete corner portion that has not been machined based on a preset allowable value and the uncut amount, and a machining incomplete corner portion And the step of determining the tool path based on the uncut amount in the part,
The process from the step of calculating the uncut amount to the step of determining the tool path is repeated until the uncut amount in the unfinished corner portion falls within the allowable value.

Therefore, unlike the conventional case, it is not necessary to add extra data and edit a figure, so that NC data can be created in a short time. NC can also be used for tool selection.
Since it is incorporated in the data, it is possible to obtain a uniform finishing accuracy without changing the processing procedure depending on the skill level of the operator as in the conventional case.

[Brief description of drawings]

FIG. 1 is a flowchart of an NC data creating method for a corner section according to an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of hardware for executing the NC data creating method of the corner section.

FIG. 3 is an explanatory diagram showing an example of a base shape.

FIG. 4 is an explanatory diagram showing various data regarding machining of a corner portion.

FIG. 5 is an explanatory diagram showing an example of a process file for machining a corner portion.

FIG. 6 is an output example of NC data created by the NC data creation method of this corner portion.

[Explanation of symbols]

100 Base shape 300 to 304 Corner section S ₁ Step for instructing the base shape S ₃ Step for calculating the uncut amount S ₄ Step for determining the tool to be used S ₅ Step for detecting the unfinished corner section S ₆ Determine the tool path Process

Claims (1)

[Claims] 1. A step of instructing a base shape, a step of calculating an uncut amount of a corner portion in a preceding step of machining, and a step of deciding a tool to be used for machining a corner portion based on the uncut amount. , A step of detecting an unfinished machining unfinished corner portion based on a preset allowable value and the uncut amount, and a tool path based on the uncut uncut portion in the unfinished working corner portion And a step of calculating the uncut amount until the uncut amount in the unfinished corner portion falls within an allowable value until the step of determining a tool path is repeated. NC data creation method.