Injection molding method of mesh filter, injection molding mold and mesh filter

Abstract

The object of the present invention is to reduce the release resistance between the opening portion of the mesh portion of the mesh filter, which is an injection molded product, and the opening portion forming pin of the injection mold, and to reduce the stress acting on the opening portion forming pin. The third cavity portion 17 forming the filter portion of the mesh filter is formed such that opening portion forming pins 21 for forming a plurality of regular octagonal opening portions of the filter portion are the same number as the opening portions. A plurality of opening portion forming pins 21 are formed at equal intervals along the X-axis direction and the Y-axis direction, and the diameter of the inscribed circle 22 of a regular octagon is the same as that of the adjacent opening portion forming pins 21, 21 along the X-axis direction and the Y-axis direction. equal in size. Along the direction that the angle formed with the X-axis direction is 45°, a plurality of openings are formed at equal intervals to form the first row of pins 21 and the interval between the second row adjacent to the first row is equal to that along the X-axis. A plurality of openings are formed at equal intervals in directions forming an angle of 135° to form a gap between the third row of pins 21 and the fourth row adjacent to the third row.

Description

technical field [0001] The present invention relates to an injection molding method of a mesh filter used for filtering foreign matter in a fluid, an injection molding mold used for injection molding the mesh filter, and a mesh filter. Background technique [0002] For example, a mesh filter is arranged in the middle of a fuel supply pipe connected to a fuel injection device of an automobile, an oil pipe of a lubricating device, etc., and foreign substances in fluids such as fuel and oil are filtered by the mesh filter. [0003] Figure 10 It is a figure which shows the conventional mesh filter 100. It should be noted, Figure 10 (a) is the front view of existing mesh filter 100, Figure 10 (b) is a side view of an existing mesh filter 100, Figure 10 (c) is along Figure 10 (a) The cross-sectional view of the screen filter 100 shown by A8-A8 line cutaway, Figure 10 (d) is Figure 10 Enlarged view of part B4 of (a). also, Figure 10 (e) is a sectional view of the mold 101 ...

AI Technical Summary

Problems solved by technology

[0006] However, Figure 10 The conventional mesh filter 100 shown in (a) to (d) is manufactured by insert molding, so it is necessary to accommodate the mesh member 103 in the cavity 110 compared to the case of integrally molding the whole by injection molding. The process of the specified position in the process, thus increasing the manufacturing man-hours accordingly (refer to Figure 10 (e))

and, Figure 10 (a) ~ (d) shown in the existing mesh filter 100 in the lattice shape of the nylon fiber 106 weaving tends to shift, the shape of the opening 102 and the area of ​​the opening 102 (the flow for the fluid to pass through). The cross-sectional area of ​​the passage) tends to be uneven, so there is a tendency to vary in the filtration performance (the ability to remove foreign matter larger than the specified particle size)

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