Before introducing the use of a torque wrench, first understand the torque wrench is also called torque wrench or torque wrench, torque is the product of force and distance, when the fastening screws bolts nuts and other threaded fasteners need to control the size of the torque applied to ensure that the thread and not because of the tightening torque is too large thread damage, so use a torque wrench to operate. Then take a look common to use a torque wrench instructions and precautions in the use of time.
Use torque wrench and selection
(1) the selected size of the opening torque wrench must be consistent with the size of the bolt or nut, wrench opening too easy to slip and damage the hex-head screw in the import car repair, we should pay attention to the choice of metric wrenches; various types selection principles wrench, socket wrench is generally preferred, followed by wrenches and again for the open-end wrench, adjustable wrench the last election.
(2) In order to prevent damage and the wrench slipped, pulling force should be thicker side of the opening, which is to force a large monkey wrench in particular, should pay attention to prevent the opening of an "eight" shape, damaged nuts and wrenches.
(3) Torque wrenches is based on the power of a human hand to the design, you experience tight threaded member, can not hit with a hammer wrench; wrenches addition, other packages can not wrench afterburner rod wrench to prevent damage or threaded connection
(4) When using a torque wrench, when they heard "popping" sound when this time is the most appropriate
Note:
1. Purpose: torque wrench to rotate the bolt or nut tool.
2. Usage: torque wrench mount should use tension cranked wrench extremely dangerous.
3. The torque wrench can be used for elastic bolt, bolt tightening bolts should be preceded by cleaning and lubricating oil.
4. Use a torque wrench when tightening bolts evenly so that the force can not use impact.
Preset Torque Wrench Features and Usage
First, the characteristics
1, with preset torque value and sound devices. When the fastener tightening torque reaches a preset value, can automatically send a signal "click" (click) is heard, accompanied by significant hand vibration prompts to complete the work. After the lifting force, the relevant parts of the wrench can be automatically reset.
2, switch two kinds of directions. Steers steering switch ratchet, wrench counterclockwise afterburner.
3, male, English (N.m, lbf.ft) double tick; handle differential mark. Reading is clear and accurate.
4, alloy steel forging, durable, long life. Calibration traceable to the National Institute of Technical Standards (NBS).
5, in line with the accuracy of ISO6789: 1992.ASMEB107.14, GGG-W-686 ± 4%..
Second, the use
1, according to the work requirements of the desired torque value, determine the preset torque value.
2, when the preset torque value, the locking ring wrench handle on the drop-down, while turning the handle to adjust the scale main tick marks and tick differential value to the desired torque value. After this adjustment, loosen the locking ring, the handle locks automatically.
3, on the side of the wrench tenon corresponding specifications of the sleeve, and trap the fasteners, then slowly force on the handle. Press the arrow direction must be indicated when external force is applied. When tightened to send a signal "click" (click) is heard (has reached the preset torque value), stop urging. Once the job is completed.
4, the use of large size torque wrenches, sets can be applied to take a long lever for effortless operation.
5. The long-term need to adjust the reticle scale retreat at minimum torque value.
