JPS5856751A - Numerical control apparatus - Google Patents

Abstract

PURPOSE:To control the life and correction amount of a tool for tool management with high accuracy working and reliability by providing a computing unit for comparing accumulated wear amount of the tool with tolerable wear amount to generated the informational output of the former reaching the latter. CONSTITUTION:A memory unit 2 stores the input of tool selection command through an input section 1 so that a controlling unit 3 controls the input, calculation, memory and output. A calculating unit 4 selects tools usable corresponding to the tool command and correction amount to generate the output of calculated result through the output section 5. As a result, a selected tool magazine is used for a machine tool 6. In this case, load amount applied to the tool in working is supplied from a detecting section 8 to the input of a second calculating unit 7 in which the tool wear amount is calculated and the accumulated wear amount is added to the correction amount when it exceeds the commanded unit so that the operation of this apparatus is carried out without any errors carsed by the tool wear.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a numerical control device, and an object of the present invention is to operate a machine tool controlled by the numerical control device unmanned for a long period of time.

Conventionally, as this type of device, It! :There was one shown in Figure 1. In the figure, (1) is an input section for inputting tool selection commands, (2) C is a storage section for storing tool commands etc. inputted by this input section (1), and (3) is an input, calculation, storage and A control section (4) that controls the output is a calculation section that selects a usable tool and a correction amount corresponding to the tool command, and an output section (5) that outputs the calculation results. . (6) is the tool selection section for dice in a machine tool.

Next, the operation will be explained. Prior to machine operation, multiple types of tools are installed in the tool magazine of the machine tool in advance, several of the same type. Then, the tool command number and life time corresponding to the tool magazine number are stored in a storage section (2)K.

Next, when actually machining, a tool number is selected and commanded according to the machining conditions, etc., and when inputted by the input section (1), the operation section (4) determines the usage time of the tools with the same tool number. A tool whose time has not been reached is selected, and if a correction calculation is necessary, the calculation is performed using correction data corresponding to the selected tool. The calculated result is output from the output unit (5) by the control unit (3) = As a result, the machine tool (6
), the selected tool magazine is selected and used as if it were a commanded tool number.

Conventional numerical control devices are configured as described above, so once a tool is selected, the correction calculation is performed using the correction amount corresponding to the tool number while the tool is being used until the tool (2) 51F life time is reached. If the correction amount is changed completely due to wear of the tool, the stored correction amount must be re-memorized, which requires operator intervention, which has the disadvantage that long-term unattended operation cannot be performed. there were.

This invention was made in order to eliminate the drawbacks of the conventional ones as described above, and detects the wear state of the tool by monitoring the machining state of the tool in use, and calculates the correction amount for correction calculation. The object of the present invention is to provide a numerical control device that can perform unmanned operation for a long time by automatically adjusting the amount.

An embodiment of the present invention will be described below with reference to the drawings. WL
In Fig. 2, the same reference numerals as in Fig. 1 indicate the same parts or corresponding parts, (7) is the second calculation section controlled by the control section (3), and (8) is the load control section from the machine side. This is a detection unit that inputs the state.

During machining operation, this device inputs the amount of load applied to the tool from the detection unit (8), calculates the amount of tool wear in the second calculation unit (7), and calculates the amount of cumulative wear that exceeds the command unit. If the accumulated wear exceeds the allowable correction amount fIL, the tool is reselected and replaced with a new tool before the tool usage time reaches its life time.

Figure 8 is W! , is a detailed block diagram of the storage unit (2), calculation unit (4), second calculation unit (7), and detection unit (8) in Figure 2. First, the detection unit (8) detects the state of the load on the tool. The information is sent to the second calculation section (7). This second calculation section (7) calculates the amount of tool wear based on information such as the magnitude of the detected load, and adds it to the tool wear amount accumulation register (7A) and the total tool wear amount accumulation register (7B).

In this case, when the amount in the tool wear amount cumulative register (7A) reaches the unit of the correction amount, the amount is added to the correction amount in the storage section (2) and the tool wear amount cumulative register (7A) is added to the correction amount in the storage section (2).
A) is subtracted from the correction i1-change.

In this way, errors due to tool wear can be automatically tracked.

In addition, the tool total wear register (7B) indicating the total wear amount of the tool and the allowable maximum wear amount register (7C) indicating the allowable maximum wear amount are stored in the comparison section (7D) in the second calculation section (7). ), and if the amount of wear exceeds the allowable value, vcij
: Information is sent to the calculation unit (4) as a tool abnormality, the calculation unit (4) calculates whether to replace the plowing tool, and by outputting this, the tool life is detected.

In this way, in the case of conventional devices, it was necessary to memorize the tool life time, but with the device of this invention, only the actual allowable wear value is memorized, not the time-varying hemorrhoid life prediction. ,
Its role is to manage tool life based solely on the amount of wear.

As described above, this invention enables high-precision machining and highly reliable tool management by processing information from the machine side and managing tool life and correction amounts, allowing unmanned operation for long periods of time. There is an effect that can be done.

[Brief explanation of the drawing]

@Figure 1 is a block diagram explaining tool life management in a conventional numerical control device, the second factor is a block diagram explaining an embodiment of the present invention, and Figure 3 is a detailed block diagram of an embodiment of the present invention. It is. In the figure, (1) is the input section, (2) is the storage section, and (3) is the ? 1il control section, (4) is the calculation section, (5) is the output section, (
6) is a machine side control section, (7) is a second calculation section, and (8) is a machine side detection section. Note that the same reference numerals in the figures indicate the same or equivalent parts. Agent Shin Kuzuno - Figure 1 Figure 6

Claims (1)

[Claims] The amount of tool wear is calculated using a storage section that stores the allowable amount of wear on the tool, a detection section that detects the amount of load applied to the tool during machining operation, and information on the amount of load applied to the tool. and a calculation unit that accumulates the wear amount, compares the cumulative wear amount of the tool with the allowable wear amount, and outputs this information when the cumulative wear amount reaches the allowable wear amount.