常州亿创钣金加工厂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

常州亿创钣金加工厂

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钣金加工告诉您数控加工中应注意的问题

2018-05-07 22:21:30 常州亿创钣金加工厂 阅读

1.零件脱落为了提高数控加工的效率和板材的利用率,要求板材一次定位加工多个零件,在钣金加工过程中,一些零件从板材上脱落下来,这就是零件脱落。零件脱落轻则停止继续加工降低生产效率,重则造成加工事故。因此数控冲加工中的零件脱落问题,已经严重影响了工作效率和加工安全。零件脱落主要是加工时设置的微连接不足,零件在加工中由于振动和冲击造成了微连接断裂,从而零件从板材上脱落下来。因此在加工过程中设置好微连接的尺寸,将会减少板材脱落的问题发生。对于板厚为0.1~1.0mm的铝板,薄板留量小,板厚留量大;韧性板材留量小,脆性板材留量大;零件小留量小,板材大留量大。对于板厚小于2mm的铝板,微连接为0.25mm,而其他板材为0.3mm;对于板厚大于2mm的铝板,微连接为0.30mm,而其他板材为0.35mm。

2.废料反弹废料反弹是指在数控冲钣金加工过程中,冲裁废料反弹到加工板材上。冲孔废料反弹到加工板料上使板料厚度局部增加,易造成刀具磨损加剧和加工质量问题。

1)厚度0.6mm以下材料易变形,加工范围受模具,一般不适合用数冲加工。

2)适中的硬度和韧性的材料有较好的冲裁加工性能;硬度太高会使冲裁力变大,对冲头和精度都有不好的影响;硬度太低,使冲裁时变形严重,精度受到很大的限制;

3)材料的高塑性对成形加工有利,但不适合与蚕食、连续冲裁,对冲孔和切边也不太合适;适当的韧性对冲裁是有益的,它可以抑制冲孔时的变形程度;韧性太高则冲裁后反弹严重,反而影响了精度。

4)冲压普通低碳钢板时,模具直径和宽度必须大于料厚,比如φ1.4的模具不能冲1.5mm的材料,冲压铝合金板和铜合金板的模具可以小一些,但冲压不锈钢和高碳钢板的模具就需要更大一些,否则模具容易断裂损坏。

5)不锈钢板一般不宜用数冲加工。当然,厚度0.8mm~2.5mm的不锈钢板可以用数冲钣金加工,但对模具的磨损大,且加工的废品率也比普通钢板要高很多;

1. parts fall off in order to improve the efficiency of CNC blanking and the utilization of plate, it is required that a number of parts are located at one time. In the process of processing, some parts fall off from the plate, which is the part falling off. If the parts are shedding, they will stop processing and reduce production efficiency. Therefore, the problem of shedding of parts in NC punching process has seriously affected the work efficiency and processing safety. The parts fall off mainly by the lack of micro connection when processing, and the parts are broken by the vibration and impact in the processing, and the parts fall off from the plate. Therefore, setting up the size of the micro connection during the processing will reduce the problem of the falling off of the plates. For the aluminum sheet with a thickness of 0.1~1.0mm, the thickness of the sheet is small, the thickness of the sheet is large, the quantity of the toughness plate is small, the volume of the brittle plate is large, the amount of the spare parts is small, and the quantity of the plate is large. For the aluminum plate with a thickness less than 2mm, the micro connection is 0.25mm, and the other plate is 0.3mm; for the aluminum plate with a thickness greater than 2mm, the micro connection is 0.30mm, and the other plate is 0.35mm.

2. the rebound of scrap rebound is that in the process of NC punching sheet metal, the punching scrap is rebounded to the processing plate. The punching waste material rebounded to the sheet metal to increase the thickness of the sheet partially, resulting in the increase of tool wear and the quality of the processing.

1) the material below 0.6mm thickness is easy to deform, and the processing area is subject to mold.

2) the material with moderate hardness and toughness has better blanking performance; too high hardness will make the blanking force larger and have a bad influence on the punch and precision; the hardness is too low to make the blanking deformation serious and the precision is greatly limited.

3) the high plasticity of the material is beneficial to the forming process, but it is not suitable for feeding and continuous blanking. It is not suitable for punching and cutting edge. Proper ductile cutting is beneficial, it can inhibit the degree of deformation in punching, and the resilience is too high, but it affects the precision.

4) when stamping ordinary low carbon steel plate, the diameter and width of the die must be larger than the thickness of the material. For example, the mold of the die can not wash 1.5mm. The die of stamping aluminum alloy plate and copper alloy plate can be smaller, but the die for stamping of stainless steel and high carbon steel plate needs to be bigger, otherwise the die can be broken and damaged easily.

5) the stainless steel plate is generally not suitable for several blanking. Of course, the stainless steel plate with a thickness of 0.8mm~2.5mm can be processed with a number of sheet metal sheet metal, but the wear and tear of the die is large and the rate of processing is much higher than that of the ordinary steel plate.


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