How to check whether the screw is fastened if fasten by manpower?

How to check whether the screw is fastened if fasten by manpower?

Question:

In the assembly lines of the electronics factories, operators usually use electric screwdrivers to fasten the screws on their products with certain torque, say, 20kgf-cm. My question is, what is the most economical and fast way to check whether every screw is fastened in the factories?

In more detail, what will be the approach for operators themselves to check the screws or for QC (Quality Control) staffs to inspect?

Now we are use electric screwdrivers with fixed torque, but I worry that workers may operate the electric screws wrongly or the electric screwdrivers are not so accurate and then fail to fasten every screw.

Answer:

The most convenient way is use torque-controlled electric screwdrivers, and set them to a certain torque.

Sometimes you can use torque wrench to calibrate electric screwdrivers, but the friction coefficient will affect the calibration.

This kind of man-made mistakes is indeed hard to avoid, unless your factory can inspect all the screws to achieve 100% quality control which is costly.

The solutions of this problem may be:

1.     Add electric sensor on electric screwdrivers – costly.

2.     Set a standard for operators to apply. For example, trigger or press the electric screwdrivers for XX seconds once when fasten a screw – difficult to enforce.

3.     Fasten all the screws with torque wrench – waste of time.

HIMAX Electric Screwdriver recommend: Usually adjust the torque of electric screwdrivers with digital torque meters.

Original Text原文 http://tw.knowledge.yahoo.com/question/question?qid=1609071007283

Translated by HIMAX Electric Screwdriver 

以人工鎖附螺絲該如何查有無鎖緊

問題:

生產線人員，以電動起子在一個產品上，很多地方，鎖螺絲扭力約20kgf-cm，如何用最省時方式及最實惠方式自主檢查或由另一人檢查每一顆螺絲都是正確鎖緊的

由作業人員自主檢查，鎖完螺絲後，用什麼方式做自主檢查，QC人員作抽檢。目前已是用設定好扭力值得電動起子，目前是怕一天下來，怕作業人員有閃失，沒鎖緊但以為有鎖緊了

答覆:

很多都是用有分段式的電動起子，把它調整至該範圍不就好了？

若怕是否準確，買隻扭力扳手比對校正就好了，但磨擦係數會影響鎖緊值

這種是屬於人為問題，的確很難去避免
若要達100%合格QC必須全檢
但您又想自主檢查就達到
1.那必須有防呆裝置,在電動起子裝感應器----價格高
2.訂定標準,例如下壓幾秒----須全員配合,風險高,但可降低不良率
3.直接以扭力扳手鎖緊-----浪費時間

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HIMAX Electric Screwdriver www.ehimax.com is a professional electrical tool supplier in China since 2001. Like HIOS, Kilews, Delvo, Kolver, ASA, Conos and so on,  we are proficient in manufacturing electric screwdrivers. HIMAX Electric Screwdrivers are designed especially for the assembly line of  electronic products such as tablet, PC, laptop, digital camera, cell phone, game console, mobile devices and so on. HIMAX Electric Screwdriver possess accurate torque control to accomplish precision screw fasten tasks and can be used in automation system. Fastening small screws, electronic screw and miniature screw is what we are good at.

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