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Method for automatically adjusting the screwing speed of a screwdriver in several successive steps and corresponding tool

A technology for screwing speed, automatic adjustment, applied in the field of tools, which can solve problems such as torque overshoot, errors, loss of productivity, etc.

Inactive Publication Date: 2010-10-20
ETAB GEORRENAULT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] A tool operating in two consecutive phases thus has the disadvantage of causing the above-mentioned phenomenon when the predetermined speed for the fastening phase is too fast, resulting in torque overshoot; or when the predetermined speed for the fastening phase is too slow, loss of productivity
[0017] Also, with these tools, the user has to select the speed of the screwing program, which of course runs the risk of error

Method used

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  • Method for automatically adjusting the screwing speed of a screwdriver in several successive steps and corresponding tool
  • Method for automatically adjusting the screwing speed of a screwdriver in several successive steps and corresponding tool

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Embodiment Construction

[0056] As indicated above, the principle of the present invention lies in the fact that a method is proposed for automatically adjusting the screwing speed as the torque changes, wherein the screwing speed is determined according to the upper and lower limits of the torque change as a function of time and Adjusted in successive levels defined by the percentage of the final torque to be achieved, where the screwing speed decreases from one level to the next and is calculated based on two coefficients:

[0057] a first coefficient K1, which is determined according to the rate of change dC / dT of the torque or in other words according to the torque change over time;

[0058]A second coefficient K2, which is determined from the torque level achieved (measured) relative to the final torque to be achieved.

[0059] For each level, the setpoint speed Vc is defined as follows:

[0060] Vc=V Max ×K1×K2,

[0061] where V Max = maximum speed of the tool (obtained from the characterist...

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Abstract

The present invention relates to a method for automatically adjusting the screwing speed of a screwdriver in several successive steps. The method is characterized by comprising executing at least two continuous grades, wherein a preset point speed Vc is kept constantly in the period of each grade and is adjusted from one grade to the next grade. Furthermore the preset point speed is calculated for satisfying an equation: Vc=VMax*K1*K2, wherein K1 is a constant coefficient of the variation range of torque that varies along with time. Furthermore K2 is a constant coefficient which aims at the percentage range of the final torque. Furthermore each grade is predefined by an upper limit and a lower limit that are represented by the percentage form of the final torque. Furthermore the variation from one grade to the next grade causes value variation of the coefficient K2.

Description

technical field [0001] The field of the invention is that of tools. More particularly, the present invention relates to industrial tools, and in particular to tools designed to perform screwing with a predetermined torque. Background technique [0002] In the field of the invention, screwing tools are very widely used in the industrial sector and may be stationary (including tools mounted on machines or manipulators) or portable. [0003] These tools may contain electric or pneumatic drive components depending on the intended application. [0004] It is increasingly common that screwing tools used in the industrial field contain components or are to be connected to systems which enable traceability of the operations performed by the tool, providing for example a record of results, such as Final screwing torque, final screwing angle, date and time of operation, or a curve representing the quality (good or bad, according to predetermined parameters) of the screwing performed...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B25B21/00B25B23/14
CPCB25B23/14B23P19/066B25B21/00
Inventor 若斯兰·马里斯热拉尔·派特巴纳尔
Owner ETAB GEORRENAULT
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