Method for controlling electric tool, and electric tool designed for carrying out method

A technology for power tools and processing tools, applied in manufacturing tools, general control systems, automatic control devices, etc., and can solve problems such as cracks

Inactive Publication Date: 2019-11-08
SPAN SCHEPPACH FABRIKATION VON HOLZBEARBEITUNGSMASCHINEN GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Fatal cracks can occur when working with an overheated saw blade

Method used

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  • Method for controlling electric tool, and electric tool designed for carrying out method
  • Method for controlling electric tool, and electric tool designed for carrying out method
  • Method for controlling electric tool, and electric tool designed for carrying out method

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Embodiment Construction

[0036] Newton's law of cooling is written in terms of the differential equation it solves as:

[0037]

[0038] in,

[0039] t: time,

[0040] k: cooling constant,

[0041] T A : at t 0 = the temperature of the object at time 0,

[0042] T U : ambient temperature,

[0043] T: The temperature of the object at time t.

[0044] Within the scope of the present invention, a device or a method is proposed for non-contact determination of the cooling constant of an object or workpiece and thus of the material the workpiece is made of. For this purpose, the ambient temperature is firstly measured by the infrared temperature sensor 1 . For this it is assumed that the sensor temperature itself is equal to the ambient temperature T U . The infrared temperature sensor 1 is capable of determining not only its sensor temperature, but also the temperature of other objects that are not in contact with the sensor. The spot laser beam is now directed via the laser diode 2 at the w...

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PUM

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Abstract

The invention relates to a method for controlling an electric tool, such as for example a drill machine, a mitre saw, circular saw or jigsaw, which has at least one machining tool such as for examplea drill or a saw blade for machining workpieces (3) composed of different materials, such as for example wood, metal or plastic, having the following steps: determining a workpiece characteristic of the workpiece (3) to be machined from previously detected measurement values, determining the workpiece material from the workpiece characteristic of the workpiece (3) to be machined, predefining initial values, which are suitable for the machining of the workpiece (3) composed of the determined workpiece material using the electric tool, for machine parameters such as feed rate, rotational speed and torque, storing the initial values for the commencement of operation of the electric tool with machine parameters set to the initial values, and / or commencing the operation of the electric tool with machine parameters set to the initial values. The invention is characterized in that, as the workpiece characteristic of the workpiece (3) to be machined, a cooling constant in accordance with Newton's law of cooling is determined, wherein, to determine the cooling constant, the ambient temperature is measured or predefined, the workpiece (3) is warmed until a predefined initial temperature is reached, and then, after a predefined time period has elapsed, the actual temperature of the workpiece (3) is measured, whereupon the cooling constant is calculated. The invention also relates to an electric tool designed for carrying out the method.

Description

technical field [0001] The invention relates to a method for controlling a power tool according to the preamble of claim 1 and a power tool provided therefor according to the preamble of claim 10 . Background technique [0002] Within the scope of the present invention, an electric tool is an electrically driven power tool, such as a hand drill, a hand-held circular saw or a hand-held jigsaw or the like, as well as a stationary power tool, such as a table-top circular saw. [0003] In such machine tools, it has already been proposed for safety reasons to detect, by means of sensors in the working area of ​​the machine tool, whether there is a limb of the operator of the machine, so that a corresponding reaction can then be made, for example the machine tool can be stopped, in order to prevent serious accidents. European patent application EP 2 386 383 A1 thus specifies a machine tool monitoring device having a detection unit for detecting the presence of human tissue in the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23B35/00B23D59/00B23Q15/00G05B19/401G05B19/4093
CPCB23D59/001B23Q15/00B23Q17/2471G05B19/401G05B19/40937B23B35/00B23B2260/128Y02P90/02G05B2219/36307G05B2219/37202G05B2219/37575G05B2219/37222G05B2219/49057G05B2219/50063G05B2219/49051G01N25/18G05B19/4163G05B2219/43146
Inventor M·宾德哈默
Owner SPAN SCHEPPACH FABRIKATION VON HOLZBEARBEITUNGSMASCHINEN GMBH
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