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Quality of China Machine Tool Industry Association Bulletin - Machine Tools, Machinery - Machinery Industry
A recent National Sample Examination quality
Quality Supervision, Inspection and Quarantine State Administration of Quality Supervision Division October 20, 2009 issued a number of national quality supervision and spot check results. Involving Machine tool Tool industry, products are:
1. Milling , Drilling Results of the national product quality supervision and spot checks
The Liaoning, Jilin, Heilongjiang, Shanghai, Jiangsu, Zhejiang, Anhui, Fujian, Jiangxi, Shandong and Guangxi, and other 11 provinces, autonomous regions and municipalities 38 production of 38 kinds of milling, drilling products for the supervision and spot checks .
Random basis for the GB15760-2004 " Metal cutting machine tools General technical requirements for security, "and GB5226.1-2002" Safety of machinery electrical equipment Part 1: General requirements "and other standards, milling, drilling products, leakage, geometric precision, winding and drawn into danger, stopper mechanical overload protection, anti-loose device, interlock devices, holding devices, guards, start, stop and emergency stop, noise, splash, operating reliability, power switch, protective grounding, insulation test, the circuit overcurrent protection, motor overload protection, electric shock protection, and control transformers and other important security and performance of the 22 items tested. There are seven kinds of products random failure, there is the main quality problems are:
geometric precision of 4 products fail, will affect the machine's processing performance. There are 2 products involved in winding and dangerous project failed. Some products to the longitudinal axis of the hand into the wheel without taking the mobile device automatically disengaged, both ends of the hand wheel at high speed rotation state, prone to hazards; some universal radial Drilling machines Product vertical shaft is not closed in prone to dangerous working winding. 1 products fail electric shock protection, electrical cabinet dangerous voltage metal terminals exposed, without protective screens and electric shock warning signs. 1 emergency stop device products do not meet safety requirements, mushroom-type button does not have the manual locking and unlocking. 1 products failed in the power switch, the switch does not lock the body in the off position, vulnerable to dangerous illegal operation. are two kinds of product control transformer failed, mainly for the adapter does not provide adequate protection.
2. Grinding wheel Results of the national product quality supervision and spot checks
The Hebei, Liaoning, Jiangsu, Zhejiang, Anhui, Fujian, Jiangxi, Shandong, Henan, Hubei and Guangdong provinces and 197 in 11 production of 200 kinds of wheel products were random inspection. Random basis for the mandatory national standard GB2494-2003 "ordinary abrasive safety regulations," recommended national standard GB/T2485-2008 "abrasive technology" as well as industry standards JB/T6353-2006 "consolidation of resin and abrasive rubber sheet wheel ", JB/T3715-2006" abrasive grinding wheels with cymbal ", JB4175-2006" abrasive fiber reinforced resin cutting wheels "and other standards, the appearance of defects on the grinding wheel products, dimensions, geometric tolerances, hardness, static unbalance, rotation test, signs and other seven projects have been tested. Spot checks found 30 products failed, the main quality problems exist:
a factory production of fiber reinforced resin abrasive cutting wheel rotation project failed in the examination of the 10 pieces of fiber reinforced resin cutting wheel speed test requirements anymore, all occur when turning broken, is a serious quality problems. 17 types of grinding wheel with a cymbal, fiber reinforced resin cutting wheels, grinding wheels and resin, ceramic flat square-shaped aperture wheel products failed. Wheel diameter is too large or too small will lead to rupture in the course of grinding wheel. There are 4 ceramic flat grinding wheel hardness of unqualified products.
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