腾讯分分彩开奖直播专业从事精密钣金加工、激光切割加工为主的钣金加工型厂家

腾讯分分彩开奖直播

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高速高精度孔钣金加工方法

2018-05-31 21:54:57 腾讯分分彩开奖直播 阅读

为了实现镗削加工的高速化和高精度化,必须注意刀齿振动对加工表面粗糙度和工具寿命的影响。为了防止加工精度和工具寿命下降,所选用的加工中心必须配备动平衡性能优异的主轴,所选镗削刀具也必须具有很高的动平衡特性。尤其是镗削工具的刀齿部分,应选择适用于高速切削的几何形状、刀具材料及装卡方式。切削刃端部的R应较大,以利于提高加工效率;在保证获得同等加工表面粗糙度的前提下,应加大进给量。但加大进给量应适可而止,否则将增大切削阻力,不利于提高加工效率。切削刃带应设置0.1mm以下的负倒棱,这样可有效保持刀具寿命的稳定。

除采用CNC切削方式对孔进行精密加工外,还可采用镗削和铰削等方式对孔进行高精度加工。随着加工中心主轴的高速化,已可采用镗削工具对孔进行高速精密加工。据报道,目前在铝合金材料上进行φ40mm左右的镗削加工时,切削速度已可提高到1500m/min以上。在用CBN烧结体作切削刃加工钢材、铸铁及高硬度钢时,也可采用这样的切削速度。预计,今后镗削加工的高速化将会迅速普及推广。

至于刀具材料,则视被加工材料性质而有所不同。如加工40HRC以下的钢等材料时,可选用金属陶瓷刀具,这种刀具在v=300m/min以上的高速切削条件下,可获得良好的加工表面粗糙度与较长的刀具寿命。涂层硬质合金刀具则适用于对60HRC以下的钢材等进行高速切削,刀具寿命非常稳定,但切削速度稍低于金属陶瓷刀具。

烧结体刀具适用于加工高硬度钢、铸铁等材料,切削速度可达1000m/min以上,而且刀具寿命非常稳定。CBN刀齿的刃带部分应进行适当的倒棱处理,这种处理对进行稳定的高速切削和延长刀具寿命极为有利。在对铝合金等有色金属及非金属材料进行超高速切削时,可选用金刚石烧结体刀具,这种刀具切削稳定,刀具寿命也很长。应注意的是,使用金刚石刀具时,刀齿刃带必须进行倒棱处理,这是保证切削稳定的重要条件。

In order to achieve high speed and high accuracy in boring machining, we must pay attention to the influence of tooth vibration on surface roughness and tool life. In order to prevent the machining accuracy and the decline of tool life, the selected machining centers must be equipped with a spindle with excellent dynamic balance, and the selected boring tools must have high dynamic balance characteristics. In particular, the cutter parts of boring tools should be selected for high speed cutting geometry, tool materials and clamping methods. The R at the end of the cutting edge should be larger so as to improve the machining efficiency. Under the premise of ensuring the same machined surface roughness, the feed rate should be increased. But increasing feed rate should be enough, otherwise it will increase cutting resistance, which is not conducive to improving machining efficiency. The cutting edge should be less than 0.1mm minus chamfering, which can effectively maintain the stability of tool life.

In addition to the precision machining of holes by using CNC cutting mode, boring and reaming can be used for high precision machining of holes. With the high speed spindle of the machining center, boring tools have been used for high-speed precision machining of holes. It is reported that the cutting speed can be increased to more than 1500m/min when boring about 40mm on aluminum alloy. Such cutting speed can also be applied when machining steel, cast iron and high hardness steel with CBN sintered body as cutting edge. It is predicted that the speed of boring machining will be popularized rapidly.

As for cutting tool material, the quality of the material is different. In the case of steel and other materials under the processing of 40HRC, metal ceramic tools can be used. This tool can obtain good surface roughness and longer tool life under high speed cutting conditions above v=300m/min. The coated carbide tool is suitable for high speed cutting of steel under 60HRC, and the tool life is very stable, but the cutting speed is slightly lower than that of the metal ceramic tool.

Sintered body cutter is suitable for machining high hardness steel, cast iron and other materials, cutting speed up to 1000m/min, and tool life is very stable. The blade part of the CBN cutter should be properly chamfered, which is advantageous to stable high-speed cutting and prolonging tool life. In ultra high speed cutting for nonferrous and nonmetallic materials, such as aluminum alloy, diamond sinter tool can be used. The cutting tool is stable and the tool life is long. It should be noted that when the diamond tool is used, the blade edge must be chamfered, which is an important condition to ensure the stability of cutting.


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