JPS6322248A - High speed machining controller - Google Patents

Abstract

PURPOSE:To prevent the occurrence of cutting edge chipping due to an increase in cutting load as well as to make optimum high speed cutting attainable, by controlling a feed speed and a spindle revolving speed from output of an acoustic emission processor converting output of an acoustic emission sensor. CONSTITUTION:An AE sensor 8 detects the reflecting numerical value of a machined state in a work 1 and a cutter 5, inputting it into an AE processor 9, and processes the detected value and, after converting it into an easily controllable waveform, inputs it into a revolving speed controller 10 and a feed speed controller 11. And, an electric current of a spindle motor 4 is detected by a spindle current sensor 12, inputting it into these controllers 10 and 11. Next, the controller 11 receives tool information is service from a machine controller 14, calling both setting upper and lower limit values, and compares them with a signal out of the processor 9, and feed speed factor 17 is set, feeding it to the controller 14, and the value multiplied to command value 15 of a NC controller 13 is outputted to feed motor 6 of each spindle as a feed speed 18, thus a table 3 is traveled. And, it is fed to the controller 10 as well thus the motor 4 is controlled to its optimum revolving speed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention provides a method for performing high-speed machining using a machine tool.
The present invention relates to a high-speed machining control device that controls the feed rate and spindle rotation speed by detecting them using an acoustic emission sensor and a spindle current sensor.

(Prior art) For NC machine tools, a device has been developed that appropriately controls the machining feed rate, depth of cut, etc. of the machine tool according to cutting conditions, and performs high-speed machining and cutting. . Therefore, the acoustic emission sensor (hereinafter referred to as AE sensor) is the sensor that most appropriately detects the cutting state.
Acoustin emission processors (hereinafter referred to as AE processors), which appropriately process the output values of AE sensors and detect the machining status of workpieces with high precision, have come into use. The output of the A and AE processor is input to the feed speed controller to control the feed speed of the machine tool (see Utility Model Application No. 81771/1983).

In addition, when performing heavy cutting, there are machines that detect the spindle current value of the machine tool and input the detected value to a feed rate controller to control the feed rate.

(Problems to be Solved by the Invention) As described above, in conventional high-speed machining control devices, the cutting state is detected by the AE sensor or the spindle current sensor, and this data is processed to control only the feed rate. ing.

However, even if the feed speed is changed, if the rotational speed of the main shaft remains constant, problems such as chipping may occur in the cutter and wear may be accelerated. For example, if only the feed rate is increased without changing the rotational speed, the feed amount of the screw will increase, and the cutting load will increase, causing chipping.

The present invention has been made in order to prevent such problems from occurring and to ensure that high-speed cutting is always performed with optimal cutting conditions.

(Means for Solving the Problems) ° In order to solve the above problems, the present invention provides an AE sensor that detects acoustic emissions generated when processing a workpiece at high speed, The A
An AE processor that converts the output of the E sensor into a waveform that is easy to process; a feed speed controller that controls the feed speed of the machine tool from the output of the AE processor; and a feed speed controller that controls the spindle motor rotation speed of the machine tool from the output of the AE processor. A rotation speed controller for controlling the rotation speed is provided.

(Function) As a result, when the machine tool performs high-speed cutting, if the feed rate increases, the rotational speed of the spindle also increases. Therefore, the amount of feed per cut of the cutter increases and the machining allowance does not increase, and high-speed machining is always performed under optimal cutting conditions.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic configuration diagram of an embodiment of the present invention, in which a wire 1 is cut by an end mill 2, which is a machine tool. A workpiece 1 is placed on a table 3, and a cutter 5 attached to a spindle motor 4 cuts the workpiece.

The table 3 is moved by the feed motor and the feed device 7.
It can be moved in each axis direction.

An AE sensor 8 is attached to the side of the table 3.
The sensor 8 detects numerical values reflecting the machining conditions of the workpiece 1 and the cutter 5, and inputs the detected values to the AE processor 9. The AE processor 9 processes the detected value of the AE sensor 8, converts it into a waveform that is easy to control, and inputs it to the rotation speed controller 10 and the feed rate controller 11. Further, the current of the spindle motor 4 can be detected by the spindle current sensor 12, and the current value during heavy cutting is input to the rotation speed controller 10 and the feed rate controller 11.

The NC controller 13 is an end mill 2 which is a machine tool.
A command device that commands all operations of the machine transmits a feed command value 15 and tool information 16 to the machine controller 14. The feed speed controller 11 receives information from the machine controller 14 as to what tool is currently being used, reads preset upper and lower limit values, and compares them with the signal from the AE processor 9.
Determine the feed rate coefficient 17. This feed rate fi17U
A value obtained by multiplying the feed command value 15 from the n, NC:1 controller 13 by the feed speed coefficient 17 sent to the machine controller 14 is output to the feed motor 6 of each axis as the feed speed 18 to move the table 3.

The feed rate coefficient 17 output from the feed rate controller 11 is also sent to the rotation speed controller 10. Further, a feed command value 15 and tool information 16 are also sent to the rotation speed controller 10. The feed rate F is the product of the feed 9 command value 15 and the feed rate coefficient, and from the tool information 1B, the cutter i number Z and the cutter II part optimum feed amount Sz are known, but the rotation speed N is N = F / Z x S z , -1-1, ---
-, - (1) Therefore, the rotation speed controller 10 controls the main shaft motor 4 so that a rotation speed of N is obtained.

In addition, during heavy cutting, the current of the spindle motor 4 is increased by the current sensor 1.
2 is detected and input to the rotation speed controller 10° and the feed speed controller 11.
7 or the rotational speed N is corrected.

Naturally, the tool information read by the NC controller 13 also includes a command to replace the cutter 5. In this case, a command is issued from the machine controller 14, an automatic tool changer (not shown) operates, and the cutter 5 is replaced, but a detailed explanation is omitted.

FIG. 2 is a flowchart showing the control algorithm. The NC controller 13 reads information related to cutting from paper tape, floppy disk 20, etc.
Step 21), if the information is not finished (Step 22)
), the feed command value 15, tool information 16, etc. are also read into the NC controller 13, so the senna output is read (step 23). Then, it is determined whether the load detected by the sensor is larger than the specified value, smaller than the specified value, or within the specified value (steps 24 and 25). If it is υ smaller than the specified value, lower the feed and rotation speed (step 26.27), and if it is smaller than the specified value, increase the feed and rotation speed (step 28.29).
. If it is within the specified value, perform processing (step 30),
When one machining is completed (step 31), the NC controller 13 further reads out the data, and cutting is performed.

(Effects of the Invention) Since the present invention has the above-described structure and operation, it not only reduces chipping and wear of the cutter and reduces troubles, but also extends the life of the cutter and improves the cutter's performance. The number of replacements has been reduced, and cutter wear has been greatly reduced.

In addition, the loss time due to cutter replacement has been reduced and machining efficiency has been improved, making it possible to shorten machining time and improving work efficiency in this respect as well.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of an embodiment of the present invention, an explanatory diagram showing a part as a block diagram, and FIG. 2 is a control flowchart. 1- Work 2... End mill (machine tool) 4... Spindle motor 8... -AE sensor 9... AE processor 10... Rotation speed controller 11... Feed speed controller Patent applicant Toyota Motor Corporation Fang Co., Ltd. 1 diagram

Claims (1)

[Claims] (1) An acoustic emission sensor that detects the acoustic emissions generated during high-speed machining of the workpiece, and processes the output of the acoustic emission sensor and converts it into a waveform that is easy to control. a feed speed controller that controls the feed speed of the machine tool from the output of the acoustic emission processor; and a rotation speed controller that controls the rotation speed of the spindle motor of the machine tool from the output of the acoustic emission processor. A high-speed machining control device characterized by: