JPH05277892A - Automatic determination method for inside diameter machining tool - Google Patents

Abstract

PURPOSE:To provide an automatic determination method for an inside diameter machining tool for automatically determining inside diameter machining tools or cutting conditions that are compatible with an inside diameter machined shape. CONSTITUTION:If there are a plurality of inside diameter machining steps, comparisons are executed on the diameter and protruding amount of a boring bar between every two inside diameter machining steps in the order of machining steps to determine the maximum and minimum. If the ratio of the maximum and minimum of the diameter and the ratio of the maximum and minimum of the protruding amount meet the specified values, it is determined that the inside diameter machining tools for the two diameter machining steps can be integrated and the integrated inside diameter is the selected. If at least one of the ratios does not meet the specified value, it is determined that the inside diameter machining tools for the two diameter machining steps cannot be integrated and the process passes to the inside diameter machining tools in the subsequent inside diameter machining steps. This series of operations are performed for all of the plurality of inside diameter machining steps.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for automatically determining an inner diameter machining tool in an automatic programming function for a numerical control (NC) lathe.

[0002]

2. Description of the Related Art In an NC lathe automatic programming function, an appropriate machining process, a machining sequence, a tool to be used, a cutting condition and a cutting method are automatically determined by inputting a work shape, a material shape and supplementary information. An NC program can be generated. Among the machining methods, in the determination of tools to be used, tools are integrated to minimize the number of tools to be used. For example, if there are a plurality of inner diameter machining processes and the inner diameter machining tools are of the same type, they are integrated into one inner diameter machining tool that satisfies a predetermined integration condition.

FIG. 9 is a block diagram showing an example of an automatic programming function for an NC lathe which realizes a conventional method for automatically determining an inner diameter machining tool. Machining process data DM input from the keyboard 2 by the operator who sees the guidance displayed on the CRT 1 is sent to the tool determining unit 4 via the input control unit 3. The machining process data DM includes a work shape, a material shape, a material total length, a cutting order, etc. for each process. The tool to be used is determined by the tool-to-be-used determination unit 4 based on the machining process data DM, and the outer diameter machining, the inner diameter machining, and the groove /
Tool data DT for each screw / slip / drill processing
O, DTI, and DTT are sent together with the machining process data DM to the outer diameter machining tool integrated processing unit 5, the inner diameter machining tool integrated processing unit 6, and the groove / screw / smooth / drill machining tool integrated processing unit 7. The used tools of the same type are integrated into the minimum number of tools satisfying a predetermined integration condition in each of the machining tool integration processing units 5, 6 and 7, and each used tool data DTO ′, DTI including the tool data of the integrated tools. ', DTT' is machining process data D
It is sent to the cutting condition determination unit 8 together with M.

Here, the tool satisfying the integrated condition of the inner diameter machining tool is a value close to or the same as a combination of the minimum value of the diameter of the boring bar and the minimum value of the protruding amount shown in the machining process data DM considering the tool interference. It is a tool with the value of.
The tools satisfying the integrated condition of the groove processing tool, the screw processing tool, the slot processing tool, and the drill processing tool are tools having the same groove processing width, edge angle, slot shape, and drill processing tool diameter, respectively. The cutting condition determining unit 8 determines the cutting conditions CC based on the respective tool data DTO ', DTI', DTT 'and the machining process data DM, and the respective tool data DTO', DTI ', DTT', cutting conditions CC.
And the machining process data DM is sent to the cutting path generator 9. In the cutting path generator 9, each tool data DTO ',
A cutting path CR is generated based on DTI ', DTT', cutting condition CC and machining process data DM, and each tool data DTO ', DTI', DTT ', cutting condition CC, cutting route CR and machining process data DM are generated. It is sent to the NC program generator 10. Then, the NC program generation unit 10 uses each tool data DTO ', DTI', DT
An NC program is generated based on T ′, the cutting condition CC, the cutting path CR and the machining process data DM.

An example of the operation in the inner diameter machining tool integration processing unit 6 having such a configuration will be described with reference to the flowchart of FIG. In the following description, the machining process data and the tool data used are collectively referred to as machining process data in order to simplify the description. It is judged whether or not the integrated processing of the inner diameter processing tool remains (step S1), and the integrated processing of the inner diameter processing tool for processing the inner diameter processing location, for example, as shown in FIG. If it remains, the machining process data of the inner diameter machining location shown in FIG. 4 is read (step S2). Then, it is determined whether or not the read machining process data is the first (step S3). In this case, since the read machining process data is the first, the diameter of the boring bar indicated in the machining process data is determined. "4
0 "and the protrusion amount" 25 "are set (step S4),
Return to step S1.

Next, the machining process data of the inner diameter machining location is read (steps S1 and S2). Since the read machining process data is not the first, the boring bar diameter “30” and the protruding amount “35” shown in the machining process data are set to the boring bar diameter “40” and the protruding amount “25”. (Steps S3 and S5). And
Smaller diameter "30", larger protrusion "35"
Is reset (step S6), and the process returns to step S1. Similarly, the machining process data of the inner diameter machining location is read (steps S1 and S2), and the boring bar diameter "12" and the boring bar diameter "30" in which the boring bar diameter "12" and the protruding amount "50" shown in the machining process data are reset. And amount of protrusion "35"
(Steps S3 and S5). Then, the smaller diameter "12" and the larger protrusion amount "50" are reset (step S6), and the process returns to step S1. Then, in this case, since there is no integrated processing of the inner diameter processing tool, all processing is ended. By the above processing, the tool satisfying the integrated condition of the inner diameter processing tool for processing the inner diameter processing location, becomes a tool having a diameter of “12” and a protrusion amount close to or equal to “50”.

[0007]

In the conventional method for automatically determining the inner diameter machining tool described above, the inner diameter machining tools satisfying the predetermined integration condition are uniformly integrated, and the cutting conditions are uniformly determined regardless of the boring bar size. Therefore, depending on the inner diameter machining shape, an inner diameter machining tool having a smaller diameter than necessary or an inner diameter machining tool having a large amount of protrusion may result in inappropriate cutting conditions. In such a case, there is a drawback in that the inner diameter processing tool and cutting conditions suitable for the inner diameter processing shape must be redetermined. The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide an inner diameter machining tool suitable for an inner diameter machining shape and a method capable of automatically determining cutting conditions.

[0008]

SUMMARY OF THE INVENTION The present invention relates to a method of automatically determining an inner diameter machining tool in an NC lathe automatic programming function. The diameters and the protruding amounts of the boring bars corresponding to the two inner diameter processing steps are compared to obtain the maximum value and the minimum value thereof, and the ratio between the maximum value and the minimum value of the diameter and the maximum value of the protruding amount and the If the ratio of the minimum values of the diameters satisfies a predetermined value, it is determined that the inner diameter machining tools of the two inner diameter machining steps can be integrated, and the integrated inner diameter machining tool is determined, and at least one of the ratios is determined. If the predetermined value is not satisfied, a series of operations for separately determining the inner diameter processing tool in the inner diameter processing step after determining that the inner diameter processing tools in the two inner diameter processing steps cannot be integrated, Compound It is accomplished by performing for all internal machining steps.

[0009]

In the present invention, it is determined whether or not the inner diameter machining tool can be integrated based on the diameter and the amount of protrusion of the boring bar, and the cutting conditions are determined by the actual boring bar at that time. As a result, optimum inner diameter machining can be performed.

[0010]

FIG. 1 is a block diagram showing an example of an automatic programming function for an NC lathe which realizes an automatic method for determining an inner diameter machining tool according to the present invention, corresponding to FIG. 9, and the same components are designated by the same reference numerals. And the description is omitted. The boring bar size BS set by the inner diameter machining tool integration processing unit 6'is sent to the boring bar integration determination unit 11, and whether or not the integration by the set boring bar size BS is suitable for each inner diameter machining shape. To be judged. Then, the determination result RT is sent to the actual boring bar determination unit 12, the actual boring bar size BST suitable for each inner diameter machining shape is determined, and it is sent to the inner diameter machining tool integration processing unit 6 '.
A cutting condition table determined by the actual boring bar size is stored in advance in the boring bar cutting condition determining unit 13, and the cutting condition CC is determined based on the actual boring bar size BST sent from the cutting condition determining unit 8. ′ Is determined and sent to the cutting path generator 9.

An operation example of the inner diameter machining tool integration processing unit 6 ', the boring bar integration determination unit 11 and the actual boring bar determination unit 12 in such a configuration will be described with reference to the flowchart of FIG. It is determined whether or not the integrated processing of the inner diameter processing tool is left (step S21). For example, when the integrated processing of the inner diameter processing tool for processing the inner diameter processing location as shown in FIG. The machining process data of the inner diameter machining location shown in is read (step S2).
2). Then, it is determined whether or not the read machining step data is the first (step S23). In this case, since the read machining step data is the first, the diameter of the boring bar indicated in the machining step data is determined. “40” is the No. of the tool size table as shown in FIG. MA of diameter 1
X. And MIN. And set the protrusion amount to "25".
In the tool size table. 1 with a protrusion amount of MAX.
And MIN. Set to.

In addition, the MAX. "2
5 "and diameter MIN. Ratio of "40" (protruding amount MAX.
/ Diameter MIN. ) “0.63” is obtained and a length scale representing the degree of the length is determined by the length scale table shown in FIG. 7, and the determined length scale “1” is the N of the tool size table.
o. The long scale is set to 1 (step S24), and the process returns to step S21. Next, the machining process data of the inner diameter machining location is read (steps S21 and S22). Since the read machining process data is not the first, the boring bar diameter “30” indicated in the machining process data is the No. of the tool size table previously set. 1 diameter MAX. Greater than "40" or MIN. It is checked whether it is smaller than "40" (steps S23 and S25).

In this case, the diameter "30" of the boring bar shown in the read machining step data is the number of the tool size table. 1 diameter MIN. Since it is smaller than "40",
The diameter “30” is the No. of the tool size table. MI with a diameter of 1
N. Temporarily set to. Then, the MAX.
The MIN. The ratio of “30” (MAX of diameter./MIN of diameter) “1.33” is obtained, and it is determined whether or not the allowable value of the ratio of diameters registered as a parameter in advance, for example, “3” or more. Yes (step S2
6). In this case, since the obtained diameter ratio “1.33” is smaller than the allowable diameter ratio value “3”, the boring bar protrusion amount “35” indicated in the read machining process data of the inner diameter machining location is calculated first. No. of the set tool size table. 1
Of the MAX. Greater than "25" or MI
N. Check if it is smaller than "25" (step S
27).

In this case, the protruding amount "35" of the boring bar shown in the read machining step data is No. of the tool size table. 1 with a protrusion amount of MAX. Since it is larger than “25”, the protrusion amount “35” is set to No. of the tool size table. 1 with a protrusion amount of MAX. Temporarily set to. And
If the projected amount of MAX. The MIN. The ratio of “30” (MAX. Of protruding amount / MIN. Of diameter) “1.17” is obtained and its length scale is determined by the length scale table shown in FIG. Then, the determined length scale "1" is the No. of the tool size table previously set.
It is determined whether or not it is the same as the long scale "1" of 1 (step S28), and if both long scales are not the same, step S30.
However, in this case, since both length scales are the same, No. of the temporarily set tool size table is set. MI with a diameter of 1
N. "30" and the amount of protrusion of MAX. "35" is set (step S29), and the process returns to step S21.

Similarly, the machining process data of the inner diameter machining location is read (steps S21 and S22), and the diameter "12" of the boring bar shown in the machining process data is the No. of the tool size table previously set. 1 diameter MAX. "4
0 "or MIN. It is checked whether it is smaller than "30" (steps S23 and S25). in this case,
The diameter "12" of the boring bar indicated in the read machining process data is the number of the tool size table. MI with a diameter of 1
N. Since it is smaller than "30", the diameter "12" is set to No. of the tool size table. 1 diameter MIN. Temporarily set to. Then, the MAX. The MIN. Ratio of "12" (diameter MAX./diameter MI.
N. ) "3.33" is obtained and it is determined whether the diameter ratio is equal to or larger than the allowable value "3" (step S26).

In this case, since the calculated diameter ratio "3.33" is larger than the allowable diameter ratio "3", it is determined that the tool integration is not suitable at the inner diameter machined portion. Then, the tool size table No. 1 diameter MIN. "30" and the amount of protrusion of MAX. "35" is determined as the actual boring bar size of the inner diameter processed portion (step S30). Then, as shown in FIG. 6, the boring bar diameter “12” indicated in the machining process data of the inner diameter machining location is designated as No. of the tool size table. 2 diameter MAX. And MIN. And set the protrusion amount "50" to N in the tool size table.
o. 2 with a protruding amount of MAX. And MIN. Set to.
Further, the set protrusion amount MAX. MI of "50" and diameter
N. Ratio of “12” (protruding amount MAX./diameter MI
N. ) "4.17" is obtained and its length scale is determined by the length scale table shown in FIG. 7, and the determined length scale "2" is set to No. of the tool size table. The long scale is set to 2 (step S31), and the process returns to step S21. If the integrated processing of the inner diameter processing tool does not remain, the No. of the tool size table is displayed. 2 MIN. MA with an overhang of "12"
X. "50" is determined as the actual boring bar size of the inner diameter machined portion (step S32), and all the processing is ended.

Next, the cutting condition determination unit 1 for the boring bar
An operation example in No. 3 will be described. The cutting condition determination unit 13 for the boring bar stores in advance a cutting condition table of the cutting speed V, the cutting depth T, and the feed speed F which are determined by the diameter and length scale of the actual boring bar as shown in FIG. 8, for example. Therefore, the No. of the tool size table set previously is set. 1 diameter MIN. V = 120m by "30" and long scale "1"
/ Min, T = 4 mm, F = 0.3 mm / rev. Is determined as the cutting condition for the inner diameter processing location, and the No. of the tool size table is determined. 2 MIN. V = 80 m / min, T = 1.5 mm, F by “12” and long scale “2”
= 0.2 mm / rev. Is determined as the cutting condition for the inner diameter processed portion.

[0018]

As described above, according to the method for automatically determining the inner diameter machining tool of the present invention, the inner diameter machining tool and the cutting conditions suitable for the inner diameter machining shape can be automatically determined, which saves the labor of the operator. It can save a lot of time.

[Brief description of drawings]

FIG. 1 is a block diagram showing an example of an NC lathe automatic programming function that realizes an internal diameter machining tool automatic determination method of the present invention.

FIG. 2 is a flow chart illustrating the method of the present invention.

FIG. 3 is a cross-sectional view of a work showing an example of an inner diameter processed portion.

FIG. 4 is a diagram showing an example of machining process data of the inner diameter machining location shown in FIG. 3;

FIG. 5 is a diagram showing a first example of a tool size table used in the method of the present invention.

FIG. 6 is a diagram showing a second example of a tool size table used in the method of the present invention.

FIG. 7 is a diagram showing an example of a long scale table used in the method of the present invention.

FIG. 8 is a diagram showing an example of a cutting condition table for a boring bar used in the method of the present invention.

FIG. 9 is a block diagram showing an example of an automatic programming function for an NC lathe that realizes a conventional method for automatically determining an inner diameter processing tool.

FIG. 10 is a flowchart illustrating a conventional method.

[Explanation of symbols] 11 Boring bar integrated determination unit 12 Actual boring bar determination unit 13 Cutting condition determination unit for boring bar

Claims (2)

[Claims] 1. In the method for automatically determining an inner diameter machining tool in the automatic programming function for a numerically controlled lathe, when there are a plurality of inner diameter machining steps, the diameters of the boring bars and the protrusion amounts corresponding to the two inner diameter machining steps are arranged in the machining order. If the ratio of the maximum value and the minimum value of the diameter and the ratio of the maximum value of the protrusion amount and the minimum value of the diameter satisfy a predetermined value, It is determined that the inner diameter machining tools in one inner diameter machining step can be integrated, the integrated inner diameter machining tool is determined, and if at least one of the ratios does not satisfy the predetermined value, each of the two inner diameter machining steps is performed. A series of operations for determining that it is not possible to integrate inner diameter machining tools and separately determining the inner diameter machining tools in the later inner diameter machining steps are performed for all of the multiple inner diameter machining steps. A method of automatically determining an inner diameter machining tool characterized by. 2. A table of cutting conditions defined for each size of the boring bar is stored in advance to enable the integration /
The method for automatically determining an inner diameter machining tool according to claim 1, wherein the cutting condition corresponding to the size of the boring bar when it is determined to be impossible is determined.