JPS59223808A - Numerically controlled machine tool - Google Patents

Abstract

PURPOSE:To decrease the manhour required for inputting the processing condition data by providing a function to a numerically controlled machine tool to produce automatically the condition data needed for processing with a small quantity of data which serves as a key. CONSTITUTION:A CPU13 of a controller 12 prodces the standard data of processing conditions, a table of correction coefficient values and a function to decide the brain of said table based on a program registered to an ROM16 to the key data supplied to an interface I/F15 from a control board 11 and stores them into an RAM17. Then the CPU13 reads out the standard data by the working cycle number within the key data and sets it as the base data on the processing conditions and then reads out the correction coefficient value corresponding to the key data to obtain the total sum of said correction coefficient value. This total sum is multiplied by the base data on the processing conditions to obtain the processing condition data. This condition data is stored to the RAM17. The CPU13 delivers the control signal Sout to a grining machine 18 based on the processing condition data via an I/F18 while monitoring the state Sin of the board 1 via an I/F19.

Description

[Detailed description of the invention] The present invention relates to improvements in numerically controlled machine tools.

In numerically controlled machine tools, it is the material of the leak.

Taking into account the shape and finished shape, machining condition data such as machining tools, workpiece movement amount, speed, etc. are created according to the machining order and input into the control device.

This control device then controls the operation of the machine tool based on these machining condition data.

As an example of this type of machine tool, Fig. 1 shows a cylindrical grinder, and Fig. 2 shows a cylindrical grinder.
The control devices are shown in the figure. Further, as an example of the machining process, operation diagrams for one stage each of a plunge grinding cycle and a traverse grinding cycle are shown in FIGS. 3 and 4, respectively.

The cylindrical grinding machine 1 shown in FIG. It can be slid. Further, the grindstone 2 rotating at a speed vG is used to grind the workpiece 9 in the radial direction using the motor 3 and the feed mechanism 4. That is, by controlling the operations in these two directions, the cylindrical grinding machine 1 can process the workpiece 911 into nine desired shapes and one dimension.

In Fig. 1, X and Z are the machining coordinate system (X: workpiece radial direction, Z
: Indicates the longitudinal direction of the workpiece.

Here, the workpiece grinding cycle includes plunge grinding shown in FIG. 3, traverse grinding shown in FIG. 4, etc. For example, in the workpiece 9 shown in FIG.
:) U/1-Set grinding, B is finished by plunge grinding.

The operator of the cylindrical grinder l operates the operation panel l shown in Fig. 2.
processing stage a to the control device 12 via t-.

The machining conditions as illustrated in FIGS. 3 and 4 are input into b and c according to the machining procedure.

The control device 12 takes in machining condition data via an interface 15 under the control of a program written in advance in a ROM (read-only memory) 16 and writes it in a RAM (read/write memory) 17. , and display the input data on a suitable display device (not shown). and,
The machining condition data written in the JIRAM 17 is read based on the execution command from the operation panel 11, and the state of the grinding machine 1 is set to Sin.
The control signal of the grinding machine l 5out f interface 18T while monitoring via the k interface 19”
Output via h. In FIG. 2, 13 is a CPU (central processing unit), 14 is a system bus, and the system bus 14 is composed of an address bus, a data bus, and a control bus.

Next, the processing procedure by plunge grinding will be explained based on FIG. 3. Note that the necessary condition data in each step is determined by considering mutual relationships. ”(1) Grinding wheel starting position X0
From XG''!f, just before the grindstone 2 contacts the workpiece 9, the grindstone 2 is rapidly forwarded at a speed F.

(2) Cut the grindstone 2 into the workpiece 9 at the feed speed Fc (<Fo) up to the coordinate XR.

(3) Rough grinding is performed to coordinate xF at feed rate FR.

(4) Rotate the grindstone 2 while stopping the feeding of the grindstone 2. The dwell amount at this time is indicated by SR in the figure.

(5) Precise grinding is performed at the feed speed FF to the coordinate Xs.

(6) Rotate the grindstone 2 fully while stopping the feed of the grindstone 2. The dwell amount at this time is indicated by sF in the figure.

(7) Retract the grindstone 2f to the starting position Xo and complete the machining.

In FIG. 3, Xw indicates the outer diameter of the workpiece before processing, and ZL indicates the left end position of the workpiece processing section.

Further, the processing procedure by traverse grinding will be explained as follows based on FIG. 4.

(1) The grindstone 2 is rapidly forwarded at a speed Fo from the grindstone starting position 1tX6 to XG just before the grindstone 2 contacts the workpiece 9.

(2) Feed the grindstone 2 with the coordinate foam 1 at a speed of 9Fa (<Fo
) to cut into workpiece 9.

(3) Perform rough grinding to coordinate XF at feed rate and speed FR.

(4) Rotate the grindstone 2 while stopping the feeding of the grindstone 2. The dwell amount at this time is indicated by SR in the figure.

(5) Return the grindstone 2' to the t-coordinate XG, and move the work 9 by the width W in the longitudinal direction of the grindstone.・−(
6) Repeat the steps (2) to (5) above for the length of the processed portion, that is, the area of coordinates zL-ZR.

(η Grinding wheel 2't - slightly in the radial direction (P at the right end of the machining part)
R□, PLI at the left end) Cutting, feeding of the grindstone 2) Rotate the grindstone 2 while it is completely stopped.The dwell amount at this time is as shown in the figure (DR (right end) e Dx.

(Left end) Indicated by K.

(8) Traverse the grindstone in the longitudinal direction relative to the workpiece 9 at speeds TR (when moving rightward) and TL (when moving leftward).

(9) Repeat the steps (7) and (8) above from the first traverse position XF1 to the second traverse position XF2.

This is called the t-1st traverse.

(10 Same conditions as the first traverse above (Put.

Px, * / DR, Dx, / TR, TL), repeat the traverse until the finished diameter Xs.

αchin Rotate the grindstone 2 while stopping the feeding of the grindstone 2,
Spark out' only ND times.

(2) Grinding wheel 2vf - Retract and complete processing.

By the way, in order to execute the machining cycle shown in FIG. 3 or 4 in a cylindrical grinder l, which is a numerically controlled machine tool, as exemplified in FIGS. 1 and 2, a large amount of machining condition data, e.g. It was necessary to input the grindstone feed speed, the coordinates of the feed speed switching point, the work rotation speed, the table feed speed, etc. These processing condition data are
The material and shape of the plane can be determined by the operator.

They are determined by considering mutual relationships based on past experience and intuition, keeping in mind finishing accuracy, etc., and must be input one by one, which takes a lot of time. Furthermore, if an unskilled line worker inputs data, there is a possibility that the machining accuracy of the finished workpiece may be lowered because the machining conditions are not appropriate.

The present invention was made to effectively solve such problems, and its purpose is to provide a system with a function to automatically generate condition data necessary for processing with a small amount of key input data. The purpose of the present invention is to provide a numerically controlled machine tool that can reduce the number of man-hours required to input machining condition data.

In order to achieve such an objective, the present invention provides means for incorporating key data on machining, a table of standard data of machining conditions and correction coefficients, and a function for determining the plane of the correction coefficient value table. processing means for reading out the standard data according to a machining cycle number in the key data and setting it as base data for machining conditions; and processing means for reading out a correction coefficient value corresponding to the key data and The processing means for calculating the sum and the base/base of the processing conditions.
The present invention is characterized in that it is provided with a processing means for multiplying the data by the sum of the above-mentioned correction coefficient values to obtain processing condition data.

A preferred embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 5 is a diagram schematically showing the main points of the present invention, and FIG. 6 is a data processing flowchart.

In the machine tool according to the present invention, for example, the cylindrical grinding mx shown in FIGS. 1 and 2 and its control device 12, the operation panel 1
Any key data KD(i)(i
= 1, 2..., M, i: correction 1 coefficient number, M: number of correction coefficients) Processing flow illustrated in Fig. 6 (program program registered in ROM 16)
Accordingly, the processing condition data is also Do(n) (n=i, 2s
ae N, n; machining condition number, N: number of machining condition data) 1 and written to the RAM 17. Furthermore, RAM
17 is equipped with a battery backup, and the contents are retained even if the power of the device is turned off.

The data processing flow will be explained according to the flowchart shown in FIG.
2) , ..., 1(Do is obtained. Next, process 52
Here, the plane number kt of the standard data table Ds (k, n) is minus the grinding cycle number Ncyc obtained in process 51. Then, in process 53, processing condition data D is processed. ←) with standard data Ds(k, n). Also, in process 54, J
-1' Machining condition number n Set to t-1. and,
The loop processing Loop X from process 55 to process 63 is repeated until the machining condition number n exceeds the number N of machining condition data D061). In process 55, the correction coefficient number i is
K upper set. Here, processing 57 to processing 60 constitutes loop processing Loop 2, and the loop processing Loop 2- is repeated until the correction coefficient number i exceeds the number M of correction coefficients. Also, in process 57, the key writing data KD is input to the function fi.
(i) is input, and the plane number j of the correction coefficient value table Ki (j, n) is determined. Then, in process 58, a correction coefficient value Ki(j,n)k is added to the workpiece variable KT. In process 59, the correction coefficient number i is incremented by one, and in process 60, the correction coefficient number i is compared with the number M of all correction coefficients, and it is determined whether the loop process Loop2 has ended. Then, if it is determined in process 60 that i>M, the correction coefficient value Ki(j, n
) is calculated for the workpiece change DKT. Furthermore, in process 61, the machining condition data Do(n) ffi written in the RAM 17 continues, and the loop process Loop
The machining condition data DI, ←) is multiplied by the sum KT of the correction coefficient values Ki (j, n) obtained in step 2, and is stored again in the area of the machining condition data Do←) in the RAM 17.

In process 62, the machining condition number n is incremented by one, and in process 63, the machining condition number n and the number N of machining condition data Do(') are incremented.
Loop processing 1. Determine whether oopl has ended. If n) is determined to be N in this process 63, it means that the automatic generation of all the machining condition data D, ←) has been completed (this means that the machining condition data Do?)
When the generation of the processing condition data D is completed, the control device 12 receives an execution command from the operation panel 11 to generate the machining condition data D written in the RAM 17. (n) Control reading and operation of the cylindrical grinding machine 1;

By adopting the configuration shown in Figures 5 and 6 above, machining condition data can be automatically generated by simply inputting a few key data without having to input a large amount of machining condition data. , it is possible to significantly reduce the number of man-hours required for inputting machining conditions.

Although Figures 5 and 6 are illustrated in a general format, in reality, the machining condition data is, for example,
Each variable shown in Figure 4 is defined, and key data includes, for example, workpiece shape, material, hardness, roughness,
The machining allowance, gauge, etc. are used, and each data is set within a reasonable range for processing. It is clear that the types of variables or correction values to be registered as machining conditions can be added or deleted as desired depending on various machining conditions.

[Brief explanation of drawings]

Figure 1 is a schematic diagram of a cylindrical grinder, Figure 2 is a configuration diagram of the control device of the grinder, and Figures 3 and 4 are one step each of the plunge grinding cycle and traverse grinding cycle as part of the machining process. FIG. 5 is a configuration diagram of various data constituting the main points of the present invention, and FIG. 6 is a data processing flowchart. In the drawing, l is a cylindrical grinder and 2 is a grindstone. 3.5 is the motor, 4.6 is the feed mechanism, 7.8 is the foot stock, and 9 is the workpiece. 11 is an operation panel, and 12 is a control device. 13 is the CPU/PU, 14 is the system node, -15, 18, 19 company interface, 16 is the ROM
%・17 is RAM. D, ←) is processing condition data, Ds(k, n) is standard data table, KD(i)
is key data, Ki (j#n) is a correction coefficient table, and KT is a work variable for adding correction coefficients. Patent applicant Mitsubishi Heavy Industries Co., Ltd. Patent attorney Shibe Mitsuishi (and 1 other person) Figure 1

Claims (1)

[Claims] In a numerically controlled machine tool, means for inputting key data for machining, means for storing a table of standard data of machining conditions and correction coefficient values, and a function for determining plain gold of the correction coefficient value table; processing means that reads out standard data of the machining conditions according to the machining cycle number in the key data and sets it as base data of the machining conditions; and a processing means that reads out correction coefficient values corresponding to the key data and sums them. A numerically controlled machine tool comprising processing means for determining the machining condition data, and processing means for determining the machining condition data by multiplying the base data of the machining conditions by the total correction coefficient value.