Method for controlling electric tool and electric tool provided for implementing the method

A technology of electric tools and processing tools, which is applied in the direction of manufacturing tools, general control systems, automatic control devices, etc., and can solve problems such as cracks

Inactive Publication Date: 2021-08-17
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 provided for implementing the method
  • Method for controlling electric tool and electric tool provided for implementing the method
  • Method for controlling electric tool and electric tool provided for implementing the method

Examples

Experimental program
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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 = object temperature 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 workpiece 3 ...

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PUM

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Abstract

The invention relates to a method for controlling a power tool, such as a drill, an oscillating saw, a disk saw or a jigsaw, which has at least one tool for machining workpieces made of different materials. (3) The processing tool, the material is wood, metal or plastic, for example, the processing tool is a drill bit or a saw blade, the method has the following steps: the workpiece to be processed is ascertained from the previously detected measurement value ( 3) workpiece characteristics; determine the workpiece material by said workpiece characteristics of the workpiece (3) to be processed; pre-set the initial values ​​for machine parameters such as feed, speed and torque, said The initial value is suitable for machining a workpiece (3) made of a certain workpiece material with the electric tool; when the machine parameter is adjusted to the initial value, the initial value for starting the operation of the electric tool is stored and / or when the machine parameter is adjusted to Start running the power tool with the initial value. The present invention is characterized in that the cooling constant is ascertained according to Newton's law of cooling as a workpiece characteristic of the workpiece (3) to be processed, wherein the workpiece (3) is heated up in order to ascertain the cooling constant measurement or preset ambient temperature, Until a preset initial temperature is reached, and then, after a preset duration, the actual temperature of the workpiece (3) is measured, followed by calculation of the cooling constant. Furthermore, the invention relates to a power tool provided for carrying out the method.

Description

technical field [0001] The invention relates to a method for controlling an electric tool, and an electric tool provided therefor. 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 working range of the machine tool by means of a spectral analysis ...

Claims

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Application Information

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Patent Type & Authority Patents(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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