Method for screwing in a screw to a predetermined tightening torque
A technology for tightening torque and screws, which is applied to screwdrivers, metal processing, wrench, etc., to achieve the effect of shortening screw-in time and accurate tightening torque
Active Publication Date: 2019-03-15
STIWA HLDG
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- Abstract
- Description
- Claims
- Application Information
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Problems solved by technology
[0003] The methods known from the prior art have the disadvantage that, in order to achieve the required tightening torque, the screw-in speed must be selected correspondingly low in compliance with the required tolerance range, in order to prevent dynamic effects that distort the tightening torque. The effect occurs based on the inertia of the drive train
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[0052] First of all, it should be maintained that in the different described embodiments the same parts are assigned the same reference symbols or the same component designations, wherein the disclosure contained in the entire description can be transferred according to the meaning to the same reference symbols or the same component designations. on the same part of the . Furthermore, the positional specifications selected in the description, such as eg top, bottom, side, etc., refer to the directly described and illustrated figures and in the event of a change in position, these positional specifications can be transferred to the new position as appropriate.
[0053] figure 1 A schematic diagram of a process screwdriver 1 is shown. A technical screwdriver 1 includes a motor 2 and a screw-in tool 3 coupled to the motor. The screw-in tool 3 can be coupled to a screw 4 or a nut so that a torque-transmitting connection between the screw-in tool 3 and the screw 4 can be produced...
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The invention relates to a method for screwing in a screw (4) to a predetermined breakaway torque by means of a screwing-in tool (3) connected to an electric motor (2) controlled by a control system (8). The method comprises the following method steps: accelerating the electric motor (2) in the screwing direction (15) to a predetermined maximum rotational speed; operating the electric motor (2) atmaximum rotational speed until a drive shaft (11) of the electric motor (2) has completed a predetermined number of spindle rotations; reducing the rotational speed of the electric motor (2) to a predetermined reduced rotational speed; operating the electric motor (2) at a reduced rotational speed until a torque increase exceeding a predetermined threshold value is detected by a measuring unit (14) downstream of the electric motor (2); tightening the screw (4) or nut again until the predetermined tightening torque is reached.
Description
technical field [0001] The invention relates to a method for screwing in a screw or nut with a predetermined tightening torque. Background technique [0002] Various methods are known from the prior art for producing a screw connection between two components. The methods known from the prior art relate in particular to production plants in which a screw or nut is screwed into a corresponding thread belonging to the respective screw or nut by means of a tool coupled to an electric motor in order to fix the component. In this case, the screw or the nut must be tightened with a predetermined tightening torque, the tightening torque to be achieved having only a small tolerance range. [0003] The methods known from the prior art have the disadvantage that, in order to achieve the required tightening torque, the screw-in speed must be selected correspondingly low in compliance with the required tolerance range, in order to prevent dynamic effects that distort the tightening torq...
Claims
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IPC IPC(8): B25B21/00B25B23/14B25B23/147
CPCB25B23/147B23P19/066B25B21/008B25B23/1475
Inventor M·布伦纳T·格吕克A·戈吕恩德尔A·库吉J·麦因加斯纳M·保迪茨
Owner STIWA HLDG