JP2670180B2 - Numerical control information creation device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to numerical control information for inputting a shape after machining and creating numerical control information for controlling a numerically controlled machine tool based on the shape after machining. Regarding the creating device.

(Prior Art) FIG. 10 is a block diagram showing an example of a conventional numerical control information creation device, from a data input device 1 to a data input unit 2.
Input data SA is input to the shape data SB after final machining,
It is separated into material data SC, tool data SD for each process, shape data SE after machining for each process, and cutting condition data SH for each process, each of which is the final post-machining shape input section 3, material data input section 4, tool data input section for each process. 5, it is sent to the post-machining shape input unit 6 for each process and the cutting condition input unit 23 for each process. Shape input part 3 after final machining
The final post-machining shape data SB input to is sent to the machining step generation unit 9, the material data SC input to the material data input unit 4 is temporarily stored in the material data storage unit 11 and then to the machining process generation unit 9. A machining process is generated based on the final processed post-machining shape data SB and the material data SC, and the post-machining shape data SE for each process, the tool data SD for each process, and the cutting condition data SH for each process that compose this machining process are generated. The data is stored in the post-machining shape storage unit 13, the process-specific tool data storage unit 12, and the process-based cutting condition storage unit 10. On the other hand, the process-specific tool data SD input to the process-specific tool data input unit 5 is stored in the process-specific tool data storage unit 12, and the process-specific post-machining shape data SE input to the process-specific post-machining shape input unit 6 is The cutting condition data SH for each process, which is stored in the post-machining shape storage unit 13 for each process and input to the cutting condition input unit for each process 23, is stored in the cutting condition storage unit for each process 10. And the shape storage unit after processing for each process
Numerical control of post-machining shape data SE for each process stored in 13, tool data SD for each process stored in the tool data storage unit 12 for each process, and cutting condition data SH for each process stored in the cutting condition storage unit 10 for each process The numerical control information is read out by the information creating unit 22, and the numerical control information is created and output. The final post-machining shape and material data is input to generate a machining process, and numerical values are generated according to each data of the generated machining process. It has a function of creating control information and a function of directly inputting each data of each machining process to create numerical control information.

(Problems to be Solved by the Invention) When a numerically controlled machine tool is operated and machined, it is common that the part drawing that is the basis of the machine includes a dimension instruction and a tolerance indicating the allowable range of the dimension at the same time. It is necessary to perform processing so that the dimensions are approximately in the middle of the range indicated by the tolerance.

For example, when the numerical control information is created based on the machining process shown in FIG. 4 generated based on the information of the component drawing shown in FIG. 3, the dimension after machining is in the middle of the range indicated by the tolerance. I will explain how to take.

First, there is a method of creating the numerical control information so that the machining path information included in the numerical control information is a machining path in consideration of the range indicated by the tolerance. Even when the machining process is generated by inputting the shape after final machining and the numerical control information is created based on this, the machining process is also directly input,
As part of that, even when the numerical control information is created by inputting the shape after machining for each process, when inputting the coordinate values of points PA and PB, the shape data considering the range indicated by the tolerance must be input. However, in order to obtain the coordinate values of points PA and PB that actually take into account the range indicated by the tolerance, a complicated mathematical expression must be used, and the tools used, the material of the material, the feed rate and the cutting The effect of the amount of inclusion must be taken into consideration, and it was virtually impossible to input the shape data considering the range indicated by the tolerance.

On the other hand, instead of considering the machining path information included in the numerical control information in consideration of the range indicated by the tolerance, there is also a method of changing the correction data of the tool when actually operating the numerically controlled lathe for machining. is there. To perform the machining so that the dimension between the points PA and PB after machining is in the middle of the range indicated by the tolerance, change the correction data of the tool number 2 when performing the machining in the second process. However, considering the effects of the tool used, the material of the material, the feed rate, and the depth of cut, the correction data for the tool cannot be changed reliably, and it is necessary to determine the appropriate amount of change in the correction data for the tool. Requires many years of experience and skill, which is very difficult for an inexperienced operator, and at least 1, in order to ensure the amount of change in tool correction data even for an experienced operator.
There is a problem in that the trial processing is required twice, and at the same time that the processing material is wasted, useless time is taken before the actual processing is started.

The present invention is made from the above-mentioned circumstances, and an object of the present invention is to change the correction data of the tool and process the tolerance range so that the dimension after machining is in the middle of the range shown by the tolerance. It is an object of the present invention to provide a numerical control information creation device that can easily create numerical control information that changes according to conditions.

(Means for Solving the Problem) The present invention relates to a numerical control information creating apparatus for inputting a shape after machining and creating numerical control information for controlling a numerically controlled machine tool based on the shape after machining. Then, the above-mentioned object of the present invention is, when inputting the shape after the processing, input means for inputting a tolerance for each shape element or each group of a plurality of shape elements forming the shape after the processing, and the numerical control. This is achieved by providing an adding means for adding information for changing the correction data of the tool based on the inputted tolerance to the numerical control information when creating the information.

(Operation) According to the present invention, it is possible to input a tolerance for each shape element or a group of a plurality of shape elements forming the shape after processing, and the dimension after the processing is within the input tolerance range. As described above, the information for changing the correction data of the tool is added to the numerical control information based on the input tolerance. In addition, the tolerance range can be moved according to the tool used, the tolerance range can be moved according to the material type and feed rate, and the tolerance range can be moved according to the material type and cutting depth. Since it is possible to do so, it is possible to automatically create numerical control information such that the dimension after machining is in the middle of the range indicated by the tolerance.

(Embodiment) FIG. 1 shows an example of a numerical control information generating apparatus according to the present invention.
It is a block diagram shown corresponding to a figure, and the same component is attached | subjected with the same code | symbol, and description is abbreviate | omitted.

Final machining shape tolerance input unit 8 via data input unit 2
The final post-machining shape tolerance data SG input to is sent to the machining step generation unit 9, and the post-machining shape tolerance data SF for each process input to the post-machining shape tolerance input unit 7 via the data input unit 2 is Stored in the shape tolerance storage unit 14 after machining for each process,
Shape tolerance data SF after machining for each process from machining process generator 9
Is also stored in the shape tolerance storage unit 14 after each process. The post-machining shape tolerance data SF for each process stored in the post-machining shape tolerance storage unit 14 and the process-specific tool data SD stored in the process-specific tool data storage unit 12 are the tool correction data change information adding unit.
It is sent to 15, the tool correction data change information SL is generated and sent to the numerical control information creating unit 22 and added to the numerical control information. Tolerance range change data for each tool Tool-specific tolerance range change data SI indicating the movement amount and direction of the tolerance range input in advance for each tool type or each tool stored in the storage unit 16 The post-machining shape tolerance data SF for each process stored in the tolerance storage unit 14 is converted to the tolerance range changing unit 17 for each tool.
Is read out, the range of the tolerance is moved according to the tool to be used, and again stored in the post-machining shape tolerance storage unit 14 for each process.
Material / Feed Speed Indicates the amount of movement and the direction of the tolerance range input according to the feed speed for each material type of the material to be processed, which is stored in advance in the tolerance range change data storage unit 19. The per-tolerance range change data SJ and the post-machining shape tolerance data SF for each process stored in the post-machining shape tolerance storing unit 14 are read out to the material / feed speed tolerance range changing unit 18 and the material type of the material to be processed. And the range of the tolerance is moved according to the feed rate, and the shape tolerance storage unit after machining is performed again for each process.
Stored in 14. Material / cutting amount tolerance range change data storage unit 21 that indicates the movement amount and direction of the tolerance range input according to the cutting amount for each material type of the material to be processed, which is stored in advance. The tolerance range change data SK for each cutting amount and the post-machining shape tolerance data SF for each process stored in the post-machining shape tolerance storage unit 14 for each process are the material / cutting amount tolerance range changing unit 20.
The tolerance range is read according to the type of material to be machined and the depth of cut, and is stored again in the post-machining shape tolerance storage unit 14 for each process.

In such a configuration, an operation example of the numerical control information creating unit 22 which is the main part will be described with reference to the flowchart of FIG. 2. In order to create the numerical control information for each process, the tool data SD for each process is used as the tool data for each process. It is input from the data storage unit 12 (step S1), and numerical control information for determining the tool replacement control and the tool correction amount is created (step S2). It is determined whether to temporarily change the tool compensation data (step S3). This is a judgment as to whether or not the dimension after machining is controlled to be within the entered tolerance range by adding numerical control information for temporarily changing the tool compensation data. Has been done.

When it is determined that the tool correction data is to be temporarily changed, the tool correction data change information SL of the tool to be used is input from the tool correction data change information addition unit 15 (step S4),
Numerical control information for temporarily changing the tool compensation data is created (step S5), and the process proceeds to step S6. On the other hand, if it is determined that the tool compensation data will not be temporarily changed,
The process directly goes to step S6. Then, the cutting condition data SH for each process is input from the cutting condition storage unit 10 for each process (step
S6), numerical control information for controlling feed, depth of cut, and spindle speed is created (step S7). Next, the processed shape data SE for each process is input from the processed shape storage unit 13 for each process (step S8). This is to create the numerical control information that controls the movement path of each moving axis, but if you move along the post-machining shape for each process before creating this, only half of the post-machining shape tolerance for each process will occur. It is determined whether the offset moving route is created as numerical control information (step S9). This is a determination as to whether or not the dimension after machining is controlled to be within the input tolerance range by changing the movement path in the numerical control information, and is specified in advance by the operator. Normally, when it is specified to temporarily change the tool compensation data, the movement along the post-machining shape for each process creates a movement path offset by half the post-machining shape tolerance for each process as numerical control information. It is specified not to do. When it is specified that a movement path offset by half of the post-machining shape tolerance for each process is created as numerical control information for movement along the post-machining shape for each process, temporary correction of tool correction data is performed. It is specified not to change.

When it is determined that the movement path offset by half of the post-machining shape tolerance for each process is created as numerical control information for the movement along the post-machining shape for each process, the post-machining shape tolerance storage unit 14 for each process Input the post shape tolerance data SF (step S10) and create numerical control information to control the movement path of each movement axis so that the movement path is offset by half the tolerance when moving along the shape after machining for each process. Then (step S11), the process proceeds to step S13. On the other hand, if it is determined that the movement path offset by half of the post-machining shape tolerance for each step will not be created as numerical control information in the movement along the post-machining shape for each step, the movement path of each movement axis is set. Create numerical control information to control (step
S12), and proceeds to step S13. Then, it is determined whether or not the tool compensation data is temporarily changed (step S13), and if the tool compensation data is temporarily changed, numerical control information for restoring the tool compensation data to the original is created (step S14). , And proceeds to step S15. On the other hand, if tool compensation data has not been temporarily changed, step
Move to S15. Then, it is determined whether or not the numerical control information of all processes has been created (step S15), and if the numerical control information of all processes has not been created, the process returns to step S1 and the above-mentioned operation is repeated, and the numerical control information of all processes is repeated. If is created, all the processing is terminated.

Next, a case will be described in which the numerical control information for machining the parts shown in the parts diagram of FIG. 3 is created by the numerical control information creating device of the present invention. In the processing of points PB to PA in the second step of the steps shown in the fourth diagram, the numerical control information must be created so that the dimension after processing is in the middle of the range indicated by the tolerance. Therefore, the tolerance range is moved based on the tolerance range change data for each tool, the tolerance range change data for each material / feed speed, and the tolerance range change data for each material / cutting depth, and the numerical control information is changed to the tool based on the moved tolerance. Information must be added to change the correction data of the above, or numerical control information must be created such that the movement along the post-machining shape is a movement path offset by half the post-machining shape tolerance for each process. I have to. FIG. 5 shows an example of the tolerance range change data for each tool, FIG. 6 shows an example of the tolerance range change data for each material / feed speed, and FIG. 7 shows an example of the tolerance range change data for each material / cutting amount. is there. First, the tolerance range is moved based on the contents of the tolerance range change data for each tool shown in FIG. Since the tool number is "2" in this step, the X-direction tolerance movement amount is "-0.001" and the Z-direction tolerance movement amount is "0". In this case, the sign of the numerical value indicates the moving direction, − indicates that the tolerance moves in the negative direction, and + indicates that the tolerance moves in the positive direction. Therefore, the tolerances from point PA to point PB are "+0.099" and "-0.001". Next, the sixth
The tolerance range is moved based on the contents of the material / feed speed tolerance range change data shown. In this step, since the material is "S45C" and the feed rate is "0.3", the X-direction tolerance movement amount is "-0.002" and the Z-direction tolerance movement amount is "0". Therefore, the tolerance from point PA to point PB is "+0.
097 "," -0.003 ". Next, the tolerance range is moved based on the contents of the material / cutting amount tolerance range change data shown in Fig. 7. In this process, the material is" S45C ", The depth of cut is "0.2", which is the finishing allowance for the ▽▽ part of the first process.
Therefore, the X direction tolerance movement amount is “−0.001”, and Z
The direction tolerance movement amount is “0”. Therefore, the tolerances from point PA to point PB are "+0.096" and "-0.004". If numerical control information is created so that the center line of the tolerance range resulting from the changes as described above becomes the machining path, the dimensions after machining will end up as a result of the effects of the tool, material, feed rate, and depth of cut. Is in the middle of the tolerances given in the part drawing.

FIG. 8 shows a portion of the numerical control information created by adding information for temporarily changing the tool correction data so that the center of the tolerance range becomes the machining path, which controls machining in the second step. It is a figure which shows, It moves to the position which exchanges a tool in sequence number "N0201", and at the same time, the tool is exchanged by designating the tool compensation number 2, the tool number 2, and the nose R compensation number 2. Then, prior to processing, the correction amount in the X direction is changed in the sequence number "N020A". Next, in the sequence number “N0202”, the machining position is approached, the cutting speed is designated in the sequence number “N0203”, and the machining is performed in the sequence number “N0204”.
In the processing of the sequence number “N0204”, the shapes shown in the sequence numbers “N0205” to “N0211” are processed. Next, after the processing location is separated by the sequence number “N0212” and the sequence number “N0213”, the correction amount in the X direction is returned to the original value at the sequence number “N020B”. FIG. 9 is a diagram showing a portion for controlling the machining of the second step in the numerical control information created by offsetting the machining path information so that the center of the tolerance range becomes the machining path. Compared to the numerical control information, the sequence number "N0
Instead of eliminating 20A "and sequence number" N020B ", the shape indicated by sequence number" N0211 "is offset from the sequence number" N0205 ", which is the machining path information, in the X plus direction, and other operations are It is equivalent to FIG.

In the above description, the material / feed speed tolerance range change data and the material / cutting amount tolerance range changing data divide the feed speed and cutting amount ranges, respectively, and move within the tolerance range for each range. However, the relationship between the feed rate, the depth of cut, the amount of movement within the tolerance range, and the direction is expressed by several functions, and the data that stores the coefficient etc. should be used. May be.

(Effects of the Invention) As described above, according to the numerical control information creation device of the present invention, the dimension after machining is in the range indicated by the tolerance in consideration of the tool used, the material material, the feed rate, the depth of cut, etc. It is possible to easily obtain the numerical control information for performing the machining so as to be in the middle of the above, and it is possible to eliminate the waste of the machining material by the trial machining and the waste of unnecessary time.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an example of the numerical control information generating apparatus of the present invention, FIG. 2 is a flow chart for explaining an operation example of the main part thereof, and FIG. FIG. 4 is a diagram showing an example of an instructed component, FIG. 4 is a diagram showing an example of a machining process determined based on the component diagram shown in FIG. 3, and FIGS. 5 to 7 are numerical control information of the present invention. The figure which shows an example of the data used for the creation apparatus, FIG.8 and FIG.9 is a figure which shows an example of a part of numerical control information which the numerical control information creation apparatus of this invention created, FIG.10 is a conventional numerical value. It is a block diagram showing an example of a control information creation device. 1 ... Data input device, 2 ... Data input part, 3 ... Shape input part after final machining, 4 ... Material data input part, 5 ...
Tool data input section for each process, 6 ... Geometry input section after machining for each process, 7 ... Geometry tolerance input section after machining for each process, 8 ... Geometry tolerance input section after final machining, 9 ... Machining process generation section, 10 …… Cutting condition storage for each process, 11 …… Material data storage, 12 ……
Tool data storage for each process, 13 ... Shape storage after machining for each process, 14 ... Shape tolerance storage after machining for each process, 15 ... Tool correction data change information addition unit, 16 ... Tolerance range change data for each tool Storage part, 17 …… Tolerance range change part for each tool, 18 …… Tolerance range change part for each material / feed speed, 19 …… Tolerance range change data storage part for each material / feed speed, 20 …… By material / cutting amount Tolerance range change part, 21 …… Tolerance range change data storage part for each material / cutting depth, 22 …… Numerical control information creation part, 23 …… Cutting condition input part for each process.

Continuation of front page (72) Inventor Takeharu Maeda 5-25-1, Shimokoguchi, Oguchi-machi, Niwa-gun, Aichi Prefecture Inside Okuma Iron Works Co., Ltd. (56) References JP-A-3-52004 (JP, A)

Claims (5)

(57) [Claims] 1. A numerical control information creating apparatus for inputting a processed shape and creating numerical control information for controlling a numerically controlled machine tool based on the processed shape, when inputting the processed shape. , Input means for inputting a tolerance for each shape element or each group of a plurality of shape elements constituting the shape after the machining, and when creating the numerical control information, tool correction data based on the input tolerance And a means for adding information to change the numerical control information to the numerical control information. 2. The numerical control according to claim 1, wherein the adding means adds information for changing the correction data of the tool such that the cutting edge of the tool passes through the center line of the tolerance range. Information creation device. 3. A storage means for storing change data consisting of a movement amount and a direction of the tolerance range for each tool or each type of tool, and the tolerance range by the change data according to a tool to be used. Claim 1 provided with the change means to change.
Numerical control information creation device according to. 4. Storage means for storing change data consisting of the movement amount within the tolerance range and its direction according to the feed rate for each material type of the material, and the storage means for the material type and the feed rate of the material to be processed. The numerical control information generating apparatus according to claim 1, further comprising a changing unit that changes the range of the tolerance according to the change data. 5. Storage means for storing change data consisting of the movement amount within the tolerance range and its direction according to the cutting amount for each material type of the material, and the material type and cutting amount of the material to be processed. The numerical control information generating apparatus according to claim 1, further comprising a changing unit that changes the range of the tolerance according to the changed data.