Plastic thread plug, model annulus dimension computation is discussed

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Affect plastic products to reach a model in the mould subsequent element of contractive, metabolic is very much, wait like pressure of temperature, inject, material, dwell time. And the factor that affects plastic whorl is more, a few more complex. So far, look from the data, return what solve plastic whorl without mature method to coordinate an issue. To come true better the treatment of plastic whorl and cooperate, if the whorl of the metric system of 60 ° reachs tooth pointed part,the common join that tighten solid uses plastic whorl below of square tooth whorl model core, model the problem such as the dimension computation of annulus undertakes discussing. Thread plug uses the whorl inside figuration, model annulus is the whorl outside using take shape, computational method is as follows: Model the external diameter of core whorl, medium diameter, internal diameter can have consideration by the formula below: Model the external diameter of annulus whorl, medium diameter, internal diameter can press face formula has consideration: However model core, model the computation of annulus whorl pitch, if press the method of above,undertake hard to avoid can generate fraction. The whorl M75 × that is like ABS material 3, the computation of its pitch is as a result 3.

02mm. If material is polypropylene, the computation of its pitch is as a result 3.

06mm. If be by this pitch on lathe treatment core or model the whorl of annulus is very difficult. But because calculate,result and former pitch differ very small (0.

02mm or 0.

06mm) , because this is in model core, model shrinkage can be taken no account of on the pitch of annulus whorl. In thread plug, model below the circumstance that the pitch of annulus takes no account of shrinkage, assure goods whorl even come back gender and dependability, can collect be bailed out to hold for this model annulus dimension of screw center diameter is changeless, add large core appropriately dimension of screw center diameter (the diameter in increasing namely cooperates clearance) the method comes to those who realize plastic whorl to cooperate. The numerical value that increases among them can be decided by experience according to the material of the size of thread outside diameter, whorl, should be in commonly 0.

2 ～ 0.

6mm left and right sides, reach from this model core is thread outside diameter, medium the computational formula of diameter, internal diameter is as follows: Discover in practice above calculation method is pointed to the tooth horn is feasible for whorl of 60 ° the metric system, but won't do however sometimes to square tooth whorl. Its reason is contract in what the axial of whorl happens and be out of shape changed pitch, the space between the tooth of whorl of inside and outside that makes cooperate and tooth is very little do not have clearance even, cause come back difficulty or the circumstance that cannot come back. To solve this problem, the author was adopted in practice machine square tooth annulus above all, use this model annulus treatment gives whorl product, consult next this whorl goods measures pitch, tooth wide, will determine the breadth of the cutting tool of treatment core whorl. The width of common cutting tool should compare groove wide a few smaller (0.

1 ～ 0.

2mm) . With such lathe tool treatment goes out model core can solve square tooth whorl between coordinate an issue. What above discusses is tooth pointed horn of whorl of 60 ° the metric system model core, model of the dimension computation of annulus and square tooth whorl model core, model the dimension computation of annulus and in working actually, the cooperates to adopt technology measure of whorl of tooth of the other side. Carry out a proof, this law effective, have reference and promotion value. CNC Milling