Topic Appearance of the joint surface being elegant, because between the projecting part it can form in the channel of the concave condition whose width is deep widely, the water to be easy to flow the mud and the like the reservoir in addition to being difficult, offers the main bar of gurechingu where the brace effect is high.SolutionsThe joint surface of the main bar of gurechingu, is formed in a state where multilateral form or the projecting part of orbicular condition has arrayed. Form of this projecting part multilateral form or is good with orbicular condition in each case, but hexagonal form especially is desirable. Can form this projecting part, to do easily making use of roller type and press the die. As needed to decide it is possible the height of the above-mentioned projecting part, but to make the height which becomes deep it is somewhat more desirable than the belt carving/moment in former knurl processing. In addition, as for interval of the projecting part, it is good to make 1 - 2mm. Choice figure Drawing 1
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