1径节与模数的关系
  模数m是模数制轮齿的一个最基本参数,是指相邻两轮齿同侧齿廓间的齿距t与圆周率π的比值(m=t/π),以毫米为单位。而径节DP是指分度圆直径每英寸长度的圆周上所分布的齿数。模数制齿轮用模数表示齿形大小,模数数字越大,齿型越大,径节制齿轮用径节表示,径节数字越大,齿型越小。径节与模数的换算关系:m=25.4DP具体数值见1.
  1径节和换算模数对照表
  2径节齿轮的测量和径节DP值的确定
  (1)径节制齿轮的测量主要确定齿轮的齿数Z、螺旋角β测和中心距A.
  通过查齿轮的齿数,很容易就可以确定齿数Z数值。斜齿轮的螺旋角β测可以通过实测取得近似值。而中心距A一般为英制尺寸,用公制量具测量,小数点位数较多。中心距A值的精确程度,将直接影响模数制齿轮各参数的准确性,应选用精度较高的工具测量,并多次测量后取平均值。
  (2)径节DP值的确定径节DP值可由下列公式确定:
  A=Z1+Z22cosβ测×1DP圯DP=Z1+Z22Acosβ测由于螺旋角β测为近似值,由上述公式计算的值也为近似值,对照上表,取最为接近的标准径节值即为标准的DP值。
  3模数制齿轮基本参数的确定
  3.1模数的确定
  由m=25.4DP可得一个理论数值,即为换算模数,此数值与模数制齿轮的标准模数(GB/T1357-1987)并不相符,这就要求根据实际需要,确定标准模数。当换算模数与标准模数相当接近时,可取对应的标准模数。例如:
  DP=20,换算模数为1.27mm,这时可取标准模数m=1.25mm.有时换算模数与标准模数相差较大,例如:DP=12,换算模数为2.12mm,与标准模数2mm和2.25mm相差都很大。这时,可在保证传动比u值不变的情况下,调整齿数,确定合适的标准模数。
  3.2齿数的确定
  齿数必须在保证传动比u值不变的前提下确定,通常有以下几种情况:(1)当通过径节转换来的模数与标准模数相当接近时,模数制齿轮的齿数Z1和Z2一般和径节制齿轮的齿数相同,通过调整螺旋角β值和齿轮法向变位系数来实现。
  (2)当通过径节转换来的模数与标准模数相差比较大时,结合标准模数,调整齿数,再通过调整螺旋角β值和齿轮法向变位系数来实现。
  (3)若以上都无法实现,在安装条件充许的情况下,可增加一级齿轮传动,确定合理齿数,达到实现转换的目的。
  3.3分度圆螺旋角β的确定
  分度圆螺旋角β应与测量螺旋接近,具体数值由设计者根据实际情况参照机械设计手册自行确定,一般取螺旋角β=8°~20°。
  4模数制齿轮的传动计算
  选择了合适的齿轮参数后,就可以对齿轮进行传动计算。
  4.1分度圆直径的确定
  分度圆直径可由下列公式确定:d1=Z1mcosβd2=Z2mcosβ
  4.2法向变位系数的选择
  由于实际中心距A多为小数,标准模数与换算模数不相等,齿轮要进行变位处理,法向变位系数可按下列公式选择。
  实际中心距A=(Z1+Z2)m2cosβ+m(x1 x2)=d1 d2 m(x1 x2)得:x1 x2==A-d1-d2mx1、x2值可由设计者根据计算结果结合实际情况确定。
  4.3齿顶圆直径的确定
  齿顶圆直径:
  d1a=Z1mcosβ 2m 2x1m=m(Z1cosβ+2+2x1)d2a=Z2mcosβ 2m 2x2m=m(Z2cosβ+2+2x2)
  4.4设计验算
  经过以上的计算,对模数制齿轮的设计基本完成,通过下列公式校核,检验各数值是否合理。
  齿顶不过薄:Sa=da(π2Z+2xtanαZ invα-invαa)≥(0.250.4)m加工时不根切:xmin≥h
  a-ZVsin2α2ZV=Zcos3β重合度:εa=1W[Z1(tanαa1-tanα′)+Z2(tanαa2-tanα′)]≥1.2满足上述公式,表明按此参数所生产的模数制齿轮能够替代径节制齿轮,满足生产使用要求。反之,则需重新选择参数,重复上述步骤,直到满足上述公式为止。
  5结语
  运用以上计算,完成了对DR2-5复合滤棒成型机的大部份径节制齿轮用模数制齿轮的替换。经过近一年的使用证明,设备运转正常,满足生产需要。
 
 

Plastic Sheets

Rigid Film Plastic Sheet is a widely recognized safe and environmentally friendly packaging, Tipack® provides different material and size solutions to meet a variety of thermoforming production.Evoh Sheet Rolls


What are rigid films?

Rigid film plastic sheets are used to produce safe and efficient food packaging to achieve the most ideal level of insurance, and are widely used in MAP, VSP, Canned, filled and sealable, preformed trays and all other container-based food industry forms.

Rigid film plastic sheets are suitable for factories and production lines using thermoforming technology, it brings a higher standard of quality to products, more competitive prices and adapts to more packaging forms.

Rigid FilmRigid Film Rolls

Advantages

Core Technology

Tiapck® supplies global users with Rigid film plastic sheets with multi-layer co-extrusion high barrier technology as the core, which means that it will have more outstanding fresh-keeping effect and better product experience.


Diversity of options

Widely used in modified atmosphere packaging, vacuum skin packaging, filling and sealable packaging, etc.


For the various usage scenarios of Rigid Film, all the answers can be found here.

Please refer to the following examples:

● Polyethylene terephthalate (PET), high-barrier or general-barrier
●Polyethylene (PE), sealable
●Polypropylene (PP), high barrier, microwaveable
●Polystyrene (PS), high barrier food grade material technology
●High impact polyethylene (HIPS), high-strength

For more application options, please send us an email or inquiry, such as high transparency, color, printable, sealable, anti-fog, high barrier, low temperature resistance, abrasion resistance, Microwaveable, etc.

Application

In food packaging, Rigid Film Plastic Sheet is widely used to make MAP Trays, VSP Trays, Fruit Cup, etc. Many foods can be packaged by Rigid Film, especially some videos with high nutritional value or long shelf life such as salmon, steak, shrimp and so on.
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Each product has its own unique packaging requirements, such as longer shelf life, more competitive appearance, anti-fog, abrasion resistance, and stronger physical construction. . . The team of Tipack engineers can provide users with scientific and more cost-effective professional advice according to the needs of the product.




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Tipack Group , https://www.tipackgroup.com