Design Of Single Side Zipper Short Boots For Wide Calabash Head

The wide gourd head is also a variant design of ordinary gourd head boots, which is changed on the width of the gourd. The method of designing wide calabash and common gourd is the same, and the double conversion method is also used.

1. finished product drawing

As shown in figure 5-2-14, the upper is made up of two parts before and behind, and the front Gang is the same as the wide gourd head.
There is zipper with a zipper tongue part in the back side of the back band, and the outer structure is a front pressure rear structure. The process of connecting the back and the seam of the back seam should be absorbed.

2. structure design drawing
As shown in Fig. 5-2-15, the height of the back tube is 120mm and the width of the cylinder is 125mm. First design the back frame and then design the front part.

In the same way, the double conversion method is used to handle the stilts, and the contour line of the gourd head is also depicted by the replica board, which is the same as the design method of the ordinary gourd head boot.

It should be noted that with the widening of the head of the gourd, the length of the stretch needed will increase. To a certain extent, it can not achieve the purpose of reduction, not the intensity of stretching is not big enough, but the strength of material is not enough. For this reason, 3 points should be paid attention to when designing the wide gourd with manual reduction: 1. The width of the gourd should not be greater than half of the width of the cylinder; secondly, transverse blanking is beneficial to stretch forming; 3. Using the lining of the front part and the crispness of the rear part are beneficial to maintain the stability of the gourd.

Other designs are high waist shoes.

Nowadays, the curved surface molding machine is often used to design the gourd, so that the gourd is prefabricated. Surface shaping can only solve the problem of reducing parts, that is, the problem of last, and can not solve the design problems of parts, so the stilt processing still exists.

From the point of view of force, surface shaping is a kind of simultaneous force, forcing parts to be changed from plane to curved surface, which is different from the gradual tensile force of the stretching operation. Therefore, the design method of the parts is different, and the effect of making the template is also different.

As shown in Fig. 5-2-16, the first step is to take the position of the front part of the front part to ensure the curve between the back midline and the last surface, and the length of the bottom contour is unchanged. Then take the front part as the copy board, with the difference between the inside and outside. The replica board is used not only to describe the outline of the parts, but also to modify the parts after the surface is finalized.

The specific operations for making the front parts are as follows:
(1) draw out the contour line of the front panel, determine the most concave center position, and generally take it near the V point, see figure 5-2-17.

(2) the length of the front side of the back midline and the straight line of the head of the gourd are not in the range of conversion. On the basis of concave arc center, 1 / 2 of the front arc is found to be 6 points respectively, and the L / 2 of the rear end arc is C point. Connect the BC line to the back midline.

(3) determine the length of the back midline through the V point as the vertical line of the midline, and turn it to a point. From the a point, take the actual length of the back curve in the straight line, then add the material back to 5mm, set the D point, then measure the actual length of the back middle curve from the a point, then add the material back to 5mm, set the e point, and the de length is the length of the back midline.

(4) draw the outline of the part from the D point to trace the outline of the front bottom of the front line gradually, and draw the outline of the wide hoist gradually from the e point, and keep the width of the center line unchanged.

The template used for setting is wider than that of the unfixed pattern, because the machine must stretch the base at the same time, and use this width to compensate for the shortage of the length. If the error of the template is relatively large, it can be corrected by adjusting the distance between aV.

The template used for setting is shorter than the unfixed template, because it does not deform the material by sew, but uses heat, pressure and control time to transform into the surface through the stereotype machine. In particular, there is almost no shrinkage in length when the shaped knife plate presses the material, but only after unloading the material will naturally shrink back. Materials with poor plasticity have larger shrinkage, which can increase the shrinkage of some length.