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晋升泰为您讲解高轻度紧固件存在的问题

文章出处:人气:0发表时间:2017-09-11【 返回列表

          随着发展进步,其工业的需求质量也越来越高,因此对紧固件的要求也在不断提高,高强度紧固件能够满足大家的需求,目前,高强度紧固件发展前景良好,但是国产高强度紧固件还是存在一些问题,根据晋升泰的了解,主要有以下几大问题所在:  

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1、脱碳层超标。脱碳层也是A类项目,由于脱碳,使得零件表面硬度和强度大大降低严重影响紧固件的表面接触强度和疲劳寿命特别对螺纹部位的害更为突出。造成脱碳的主要原因是原材料脱碳、材料改制过程中脱碳和产品热处理过程中脱碳。(Decarbonization layer exceeded. Decarburization is also a Class A project, due to decarburization, making the parts of the surface hardness and strength greatly reduced serious impact on the fastener surface contact strength and fatigue life, especially for the screw site damage is more prominent. The main reason for decarburization is decarburization of raw materials, decarburization during decontamination of materials and decarburization during heat treatment.)
 
2、尺寸超差。紧固件属通用零部件,互换性要求较高,尺寸超差将直接影响其互换性,甚至影响连接强度、防松性能或寿命.造成尺寸不合格的主要原因一是工艺过程控制不当,为了省料将部分尺寸控制在下限附近,生产过程中没有及时调整设备,使用超差的工模具:二是检验不力,工序检验和出厂检验不严,使一些不合格批过关;三是在用量具不能定期进行计量检定,甚至使用超过磨损极限的量规。(Oversize. Fasteners are common parts, interchangeability requirements are higher, the size of the tolerance will directly affect its interchangeability, and even affect the connection strength, anti-loose performance or life. The main reason for the size of the failure of the process is improperly controlled , In order to save some of the size control in the vicinity of the lower limit, the production process is not timely adjustment of equipment, the use of ultra-poor tooling: Second, poor inspection, process inspection and factory inspection lax, so that some unqualified pass; The gauges can not be used for metrological verification on a regular basis, even with gauges that exceed the wear limit.)
 
3、保证载荷,楔负载不合格。保证载荷和楔负载是考核产品在拉力载荷作用下的机械性能的关键项目A类.,对于高强度紧固件尤其重要。保证载荷是考核在承受规定的拉力载荷下产品抗塑性变形能力,如果该项指标达不到要求,由于预紧力和工作载荷的作用,可能产生塑性变形,从而降低预紧力,使连接松动。楔负载试验是考核螺栓产品实物的抗拉强度和头杆结合强度,该项指标不合格,在较大的工作载荷,特别是冲击载荷的作用下或支撑面受偏载作用时,出现断裂或掉头,造成连接失效,甚至出现安全事故。(To ensure that the load, wedge load failed. Ensure that the load and wedge load are the key items in the mechanical properties of the product under tensile load, which is particularly important for high strength fasteners. To ensure that the load is to assess the tensile strength of the product under the tensile resistance of the product, if the index does not meet the requirements, due to the role of preload and work load, may produce plastic deformation, thereby reducing the preload, The Wedge load test is to assess the tensile strength of the bolt product and the head of the joint strength, the indicators failed, in the larger working load, especially under the impact of the impact or support surface by partial load, the fracture or U-turn, resulting in connection failure, and even security incidents.)
 
4、硬度不合格。硬度也是考核紧固件机械性能的重要指标,对于各性能等级产品所采用的材料是不同的,紧固件选用时机械性能等级是重要的依据,在安装和使用中要按照性能等级确定工作载荷和安装扭矩,针对特定的材料,硬度应控制在一个合理的水平,高的硬度可能降低产品的耐疲劳性能,一些企业为了提高产品的强度,硬度控制在较高的水平,造成部分产品超标。(Hardness is not qualified. Hardness is also an important indicator of the mechanical properties of fasteners, for the performance grade products used by the material is different, the choice of fasteners when the mechanical performance level is an important basis for the installation and use in accordance with the performance level to determine the work load And installation torque, for a specific material, the hardness should be controlled at a reasonable level, high hardness may reduce the product's fatigue resistance, some enterprises in order to improve product strength, hardness control at a higher level, resulting in some products exceeded.)

这些就是晋升泰为您讲解的高轻度紧固件产品现在存在的一些问题,希望能为您带来帮助。

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