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Molded part plastic mold thread pitch size calculation

Together with metal threaded screw,[link widoczny dla zalogowanych], a tightening some reluctantly, but is not a problem for the plastic thread. The shrinkage rate difference between different kinds of plastic many families, the male co-shrinkage of small pitch who do not wish to receive 31 test shrinkage, shrinkage rate is high to consider the pitch contraction. When considering the pitch of the mold shrinkage is calculated by the above pitch,[link widoczny dla zalogowanych], the note should be Sc Scp a Sc. If so,[link widoczny dla zalogowanych], then the inner and outer thread pitch is smaller than the standard case with Taiwan. Some of the information presented; with the thread length L> 20 mm,[link widoczny dla zalogowanych], the pitch should be due to shrinkage (such as Also, when the thread with the teeth more than 7-8 teeth, the contraction of the cumulative value of the big pitch, pitch shrinkage must be taken into account (such as the Chengdu University of Science We believe that these references are inaccurate. Because these references, none of the specified thread diameter. We believe that only press the derivation of the LM & and z derived formula to calculate the pile pull and z LM vote, and then make judgments do. See the following figures: Kettle hopane pitch control plug Xin Xin Xin gluttonous shame Bei dtbLM love pull pull Z (mm) (mm) (mm) (mm) 30.50.1188.5117.0240.70.140i0. i014.43610.16812.1212.1281.250.18713.4310.79101.50.20514.799.86182.50.26519.117.652430.29020.926.97303.50.31322.586.453640.33524. 166.044850.37527.055.41 Note (1) J, and Z reported above pull LM and crabs LH pole = 0.57. b, Sce and pull = L_ pull z / t calculated, where Scr level 0008 mm, mm. (2) - Lo Wang inclined to borrow the minimum standards of animal husbandry and poor accuracy of the ugly,[link widoczny dla zalogowanych], India 8 wrapped around the disk is a bad degree of convergence tolerance standard tripod. From the above figures, above is common. Then, taught with the smaller limit the length of L, limit the number of teeth z with the larger cast. ~ iIM3: LM <8.5 毫米, Z can not teach more than 17 teeth. larger thread diameter and pitch, the limit distribution platform length LM & larger Limit the number of teeth Z board with the smaller units. If M maggots: L <30 毫米, Z pole is only 5 teeth more. Now they're discussing, which is not enough compensation for pitch diameter of the gap shrinkage, calculated by a special pitch to the irregular fractional processing problems. We know that threads are generally in the lathe, lathe processing special pitch in general there are two ways: (1) hanging round hanging round of the calculation method and calculation of the normal pitch of the hanging round the same, just need to set a special number of teeth prepared hanging round. (2) model law by hanging round at the standard pitch, but the lathe tailstock offset when processing the workpiece tilt the cutting tool parallel to the workpiece centerline Hu movement by mode, you can car Ⅱ special thread pitch. Figure 2 Schematic diagram of a by-mode method. lathe center line 2. tailstock center line 3. lathe mandarin duck bar 4. by mode 5. the tool of special pitch t. T.'re calculating the standard pitch offset tailstock courtyard m: Figure 2 shown, Sinct = ULM = ULs (i ten ScP), then f = Ls (14-Scp) · Sinct located x units of plastic parts for the tailstock offset required thread length, or offset coefficient, ie x = l / Ls, then x = (1 ten Scp) · Sinu. x rectifiable, where d = COS (LsIL.) = cosI1C1 / (i + Sop)]} x also has the table to be investigated, see production and standardization of advanced technology and equipment, mold, mold new materials and surface treatment} strong concern in the mold design and manufacture of computer applications in various advanced mold Yun} typical structure and manufacturing technology. Welcome to the relevant units and individuals active contributors. ( Chaiyong Yan Xi'an Instrument Factory Manufacturing Technology reported) § 2 Total IO module County Industrial 1989.No.8

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