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Control method and device for impact screw tightening device

一种紧固装置、控制方法的技术，应用在螺丝刀、制造工具、金属加工等方向，能够解决紧固扭矩精确度变动、旁通阀油压调整麻烦、油压脉冲部发热大等问题

Active Publication Date: 2008-04-30
ESTIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, in the hydraulic pulse torque wrench, there are various problems such as the following: the adjustment of the hydraulic pressure of the bypass valve that operates as the clutch mechanism is cumbersome, and frequent readjustment and parts replacement due to the deterioration of the hydraulic pulse generating part are required. , The accuracy of the tightening torque fluctuates due to the oil temperature and a countermeasure is required due to the large heat generation of the hydraulic pulse part

Method used

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  • Control method and device for impact screw tightening device
  • Control method and device for impact screw tightening device
  • Control method and device for impact screw tightening device

Examples

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no. 1 Embodiment approach

[0037] FIG. 1 is a block diagram showing the overall configuration of a screw fastening device 1 according to a first embodiment of the present invention.

[0038] In FIG. 1 , a screw fastening device 1 is composed of a screw fastening device main body 3 and a control device 4 having a servo driver 7 and a control regulator 8 .

[0039] The screw fastening device main body 3 is composed of a motor 11 , an impact generating device 12 , a torque sensor 13 , an encoder 14 , an output shaft 15 , an unillustrated case, a switch, and the like.

[0040] As the engine 11, for example, a three-phase AC servo motor is used. The impact generating device 12 is a collision energy generating mechanism that converts the rotational force of the engine 11 into intermittent impact force. Although various mechanisms are used as the impact generator 12, in this embodiment, reduction gears composed of planetary gears and the like are used. The backlash (clearance) of the planetary gears and the ...

no. 2 Embodiment approach

[0117] Next, a second embodiment of the present invention will be described.

[0118]In the first embodiment described above, the increase amount ΔI2 of the current pulse DP in the second stage is made smaller than the increase amount ΔI1 of the current pulse DP in the first stage. Therefore, after the tightening torque TQ reaches the target approaching torque TQN as the first set value, the increase amount ΔI2 of the current pulse DP is controlled so that the increase amount of each pulse of the tightening torque TQ is greater than that before reaching the target approaching torque TQN. smaller.

[0119] In contrast, in the second embodiment, when the tightening torque TQ reaches the target approaching torque TQN, the value of each pulse-shaped current supplied to the engine 11 is reduced. For other functions and structures, since there are many parts that are the same as those in the first embodiment, the description of the parts that are the same as those in the first embo...

no. 3 Embodiment approach

[0130] Next, a third embodiment of the present invention will be described.

[0131] Fig. 13 is a flowchart showing a torque secondary control processing routine according to the third embodiment of the present invention.

[0132] In the third embodiment, the first embodiment and the second embodiment are combined. That is, as shown in FIG. 13, in the first phase, the current value of the current pulse DP is set to D1T1 only for the first time (#61). Thereafter, when the tightening torque TQ has not reached the target approaching torque TQN (No in #62), an increment ΔI1 is added to the current value (#63). After the tightening torque TQ reaches the target approaching torque TQN (Yes in #62), set the current value of the current pulse DP to D1T2 (#64) only for the first time, and then add the increment ΔI2 to the current value (# 65). Also, the increase amount ΔI2 is a smaller value than the increase amount ΔI1.

[0133] That is, the third embodiment is a special case of th...

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Abstract

In an impact screw tightening device using an electric motor as the drive source for rotation, tightening torque accuracy is improved and time required for screw tightening is reduced. A control method for an impact screw tightening device using an electric motor as the drive source for rotation, where an electric current is intermittently supplied to the motor to drive and rotate it so that torque applied to a load by the rotation of the motor is pulse-shaped on a time axis, and where, after the torque has reached target approach torque TQN which is a first set value, an electric current for each beat of the pulse of the torque is controlled so that an increment for each beat is less than that before the torque reaches the target approach torque TQN.

Description

technical field [0001] The invention relates to a control method and device of an impact screw fastening device, in particular to a screw fastening device which reduces reaction force and is suitable for one-handed holding. Background technique [0002] Conventionally, in order to fasten a bolt or a screw with a predetermined torque, a power-type screw fastening device is generally used. In the screw fastening device, generally, control is performed such that the shaft is continuously rotated to fasten the screw, and when the torque reaches a certain value, the power is cut off or the clutch is slipped. [0003] However, in various assembly lines, for the work on the conveyor, the operator often carries out the screw fastening work with the screw fastening device by hand. [0004] In that case, from the viewpoint of workability, it is preferable that the screw fastening device can be operated by holding it with one hand. Since the screw fastening device held with one hand ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B25B23/14B25B21/00
CPCB25B23/1405B23P19/066B25B23/1475B25B21/00
Inventor 伊藤隆也柴田芳次高村均
Owner ESTIC CORP
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