JP4819416B2 - Method for producing mesh filter and injection mold for producing mesh filter - Google Patents

Description

  The present invention relates to a method for manufacturing a mesh filter that is mounted in a passage through which a liquid such as oil flows, for example, and prevents contamination and the like, and an injection mold for manufacturing a mesh filter.

  A mesh filter that prevents foreign matter from entering or filters dust or the like is attached to piping or the like of an automobile lubrication device. Such a mesh filter has a shape in which a mesh member is stretched around a resin frame member.

  As shown in FIG. 8, the mesh filter 10 injects resin into the cavities 41 and 51 with the mesh member 11 sandwiched between the mold 30 including the lower mold 40 and the upper mold 50. The periphery of the mesh member 11 is manufactured by being embedded in the frame member 12.

  However, this manufacturing process has the following problems. That is, the mesh member 11 is pressed by the injected resin and is displaced from a predetermined arrangement position (see an imaginary line in FIG. 7), or the periphery of the mesh member 11 is pressed by the resin R and bent. 41 may stick to the inner surface of 41 (see FIG. 8).

  As shown in FIG. 7, when the mesh member is displaced, the mesh member 11 protrudes from the frame member 12 and looks bad, and the mesh member 11 cannot be held at a predetermined position of the frame member 12. It is not possible to cause a problem in terms of strength.

  Further, as shown in FIG. 8, when the peripheral edge of the mesh member 11 is bent, the mesh member 11 is exposed and the appearance is deteriorated. When exposed to a state of being repeatedly pressed, stress concentrates on the bent corner C (see FIG. 8), and the mesh member may be damaged from the corner C.

  In Patent Document 1 below, a mesh member is sandwiched between a pair of molds, and a frame member is formed by injecting resin into a cavity from an injection nozzle disposed on the outer side of the outer peripheral edge of the mesh member. A manufacturing method is disclosed, and bending of the mesh member is prevented by preventing the resin from directly contacting the mesh member at the time of injection.

Patent Document 2 listed below is a so-called multi-walled mold that can mold a plurality of mesh filters by one injection, and has a cavity and a circumferential groove formed along the outer periphery of the cavity. Has been disclosed. In order to form a plurality of mesh filters, this mold has many mating surfaces on which the molds abut each other. Therefore, since the mesh member can be clamped in a tightly stretched state, displacement of the mesh member and bending of the peripheral edge thereof are suppressed.
JP 2004-202983 A Japanese Patent No. 2749127

  In the case of the above-mentioned Patent Document 1, resin is prevented from directly contacting the mesh member at the time of injection. However, since it is difficult to accurately control the flow of the resin, there is a possibility that the mesh member is misaligned or bent. I can't throw it away. In the case of the above-mentioned Patent Document 2, the mesh member is cut along with the circumferential groove after the mold is cut out to obtain one mesh filter. However, the edge of the mesh member cannot be denied but looks nice. There is a problem.

  Accordingly, an object of the present invention is to prevent a positional shift or deformation due to an injection pressure of a resin during injection molding, so that the edge of the mesh member is not exposed from the frame member, and the mesh filter manufacturing method and the mesh filter It is to provide an injection mold for production.

In order to achieve the above object, according to a first aspect of the present invention, a mesh member is disposed in an injection mold having a frame-like cavity and a support pedestal provided inside the cavity, and the center of the mesh member is arranged. while holding the parts in the mating surface of the support base, and injecting a resin into the cavity formed in the periphery of the mesh member, a method in which the peripheral edge of the mesh member to produce a mesh filter which is held by a frame member made of resin In this case, when the metal mold enters the cavity and closes the mold, the mesh member has a pin shape or a rib shape that partially sandwiches an edge portion disposed in the cavity, and the support base a protrusion having a flat mating surface having the same height as the mating surface of the formed on the inner surface of the mold, while partially sandwich the edge portion of the mesh member by said projections, said cavity Wherein in I is to provide a method for manufacturing a mesh filter, characterized by injecting the resin through the runners provided in a and different heights parallel with the mating surfaces.

According to the above Symbol onset bright, when the mold is closed, an edge portion disposed in the cavity of the mesh member, while partially clamped by the pin-like or rib-like projections, a resin into the cavity By injecting, it is possible to prevent the mesh member from being displaced, and the edge of the mesh member from being bent by the injection pressure of the resin, so that it can be lifted or protruded from the surface of the frame member to be molded. For this reason, the mesh filter by which the periphery of the mesh member was embed | buried under resin-made frame members, and was hold | maintained firmly can be manufactured. Moreover, since the part pinched by the said protrusion turns into a part which the mesh member exposed, the filtration area of a filter can be increased.
A second aspect of the present invention is the mesh filter according to the first aspect, wherein the mesh member is an edge of the mesh member and injects a resin into the cavity while sandwiching a corner portion of the mesh member with the protrusion. A manufacturing method is provided.

According to a third aspect of the present invention, in an injection mold for producing a mesh filter in which the periphery of a mesh member is held by a resin frame member, a frame-shaped cavity for molding the resin frame member, and the mesh while sandwiched by the central portion of the mating surfaces of the members, and a support base for supporting the peripheral portion of the mesh member by extending into the cavity, enters from the inner surface of the mold the interior of the cavity write unnecessarily pin-like or An edge portion which is formed in a rib shape and has a flat mating surface having the same height as the mating surface of the support pedestal and which is disposed in the cavity of the mesh member when the die is closed partially provided with a clamping Soo that collision caused Prefecture, one of the support base of the mold is raised than dividing plane, the other support pedestal of the mold is not depressed than dividing plane, the mold The split surface of It is intended to provide a mesh filter manufacturing injection mold, characterized in that runner communicating is provided Yabiti.

According to the above Symbol onset bright, when the mold is closed, the edge portion disposed in the cavity of the mesh member, because it is partially clamped by the pin-like or rib-like projections, in that state, By injecting the resin into the cavity, as described above, it is possible to manufacture a mesh filter in which the periphery of the mesh member is embedded in the resin frame member and firmly held. Moreover, since the part pinched by the protrusion is the part where the mesh is exposed, the filtration area of the filter can be increased.

In addition, when the mesh member is clamped with the mold closed, the mesh member is not deformed or pulled because each part of the mesh member is clamped at the same height position. Etc. can be prevented.

  According to the method for manufacturing a mesh filter of the present invention, when the mold is closed, the resin is injected into the cavity in a state where the edge of the mesh member is partially sandwiched by the pin-shaped or rib-shaped protrusions. Therefore, it is possible to prevent the mesh member from being displaced and the edge of the mesh member from being bent by the injection pressure of the resin, and manufacture a mesh filter in which the periphery of the mesh member is firmly held by the resin frame member. it can.

  Further, according to the injection mold for producing a mesh filter of the present invention, as in the above-described method for producing a mesh filter, the resin is contained in the cavity with the edge of the mesh member partially sandwiched by the protrusions. Is injected, a mesh filter in which the periphery of the mesh member is firmly held by the resin frame member can be manufactured.

  Hereinafter, a method for producing a mesh filter and an injection mold for producing a mesh filter according to the present invention will be described with reference to the drawings.

  The method for manufacturing a mesh filter of the present invention can be applied, for example, to manufacture a mesh filter 10 as shown in FIG.

  The mesh filter 10 includes a mesh member 11 formed by braiding a metal wire or the like, and a resin frame member 12 that holds the periphery of the mesh member 11. The mesh member 11 is held approximately at the center of the frame member 12 in the height direction. Further, through holes 13 having a diameter smaller than the width of the frame member 12 are formed from the upper end surface and the lower end surface of the frame member 12, and the mesh members 11 are exposed in the through holes 13. Therefore, not only the central part of the mesh member 11 stretched inside the frame member 12 but also a fluid such as oil can pass through a portion where the mesh member 11 is exposed by providing the through hole 13. .

  The mesh filter 10 is manufactured by a mesh filter manufacturing injection mold 30 (hereinafter referred to as a mold 30) shown in FIGS.

  That is, the mold 30 includes a lower mold 40 and an upper mold 50 disposed on the lower mold 40. The lower mold 40 and the upper mold 50 are integrated to manufacture the mesh filter 10. It is supposed to be.

  Cavities 41 and 51 for forming the frame member 12 are formed on the inner surfaces of the lower mold 40 and the upper mold 50, respectively, with a predetermined depth. With the cavities 41 and 51 as a boundary, the outer portions are formed with split surfaces 42 and 52 that abut against the other mold. Further, a support pedestal 43 that is slightly raised from the dividing surface 42 is provided in the inner part of the cavity 41 of the lower mold 40, and a support pedestal 53 that is slightly depressed from the dividing surface 52 is provided in the inner part of the cavity 51 of the upper mold 50. Is provided.

  The mating surfaces 44 and 54, which are the end surfaces of the respective support bases 43 and 53, support the center of the mesh member 11 when the mesh member 11 is set, and the mating surface of the other die when the mold 30 is closed. Together, it becomes a portion that sandwiches the central portion of the mesh member 11. The height of the mating surfaces 44 and 54 from the end surfaces of the molds 40 and 50 is D1.

  Pin-shaped protrusions 45 and 55 project from the cavities 41 and 51 perpendicularly to the bottom surface. Referring to FIG. 2 as well, a plurality of the protrusions 45 and 55 are provided at predetermined intervals along the shape of the cavities 41 and 51. And the edge part of the mesh member 11 by which the center part was supported is supported by the mating surfaces 46 and 56 which are the upper end surfaces of this processus | protrusion 45,55. The number of the protrusions 45 and 55 can be selected as appropriate depending on the size of the mesh filter 10 to be manufactured. Is preferred.

  Further, the mating surfaces 46 and 56 of the protrusions 45 and 55 are projected from the end surfaces of the respective molds 40 and 50 at a height D2, and this height D2 is the same as the height D1 of the mating surfaces 44 and 54. Preferably there is. In this way, when the mold member 30 is closed and the mesh member 11 is clamped, each part of the mesh member 11 is clamped at the same height position, so that the mesh member 11 is not deformed or pulled. Further, damage to the mesh member 11 can be prevented.

  As shown in FIG. 2, the outer periphery of the cavity 51 of the upper mold 50 communicates with the cavity 51, and a runner 57 extends in a direction substantially perpendicular to the cavity 51. Further, as shown in FIG. 3, a gate 58 communicating with the runner 57 is erected in the vertical direction from the end of the runner 57. The gate 58 opens outward, and an injection nozzle 60 of an injection molding machine (not shown) can be inserted.

  Such a lower mold 40 and / or an upper mold 50 can be moved in the vertical direction by an air cylinder (not shown) or the like, so that the mold 30 can be opened and closed.

  Next, the process for manufacturing the mesh filter 10 using the mold 30 described above will be described.

  First, the mesh member 11 is disposed on the lower mold 40. At this time, the lower surface of the central portion of the mesh member 11 is supported by the mating surface 44 at the upper end of the support pedestal 43, the peripheral portion enters the cavity 41, and the lower surface of the edge portion is supported by the mating surface 46 at the upper end of the protrusion 45. Supported.

  In this state, the upper die 50 is lowered by an air cylinder (not shown) or the like. Then, as shown in FIG. 3, the mesh surface supported by the lower mold 40 is supported by the mating surface 54 of the support pedestal 53 and the mating surface 56 of the protrusion 55 so that the upper surface of the center portion and the edge portion of the mesh member 11 is supported. The mold 30 is closed in a state where the central portion of the member 11 is clamped and the edge portion is partially clamped.

  Then, an injection nozzle 60 of an injection molding machine (not shown) is inserted into the gate 58, and resin is injected. The injected resin passes through the gate 58 and the runner 57 and flows into the cavities 41 and 51, and the frame member 12 is molded with the edge of the mesh member 11 embedded therein, and the mesh filter 10 is formed. Manufactured.

  In the state where the mold 30 is closed at this time, the edge portions disposed in the cavities 41 and 51 of the mesh member 11 are partially sandwiched by the pin-like protrusions 45 and 55, and in this state, Since the resin is injected into the cavities 41 and 51, the mesh member 11 is displaced, or the edge of the mesh member 11 is bent by the injection pressure of the resin, and is raised on the surface of the frame member 12 to be molded. , It can be reliably prevented from protruding.

  Therefore, the mesh filter 10 in which the peripheral edge of the mesh member 11 is embedded in the resin frame member 12 and firmly held can be manufactured. In addition, since the through-hole 13 is formed as described above and the mesh member 11 is exposed in the portion sandwiched between the protrusions 45 and 55, the filtration area of the mesh filter 10 can be increased.

  4 to 6 show another embodiment of an injection mold for producing a mesh filter of the present invention. It should be noted that substantially the same parts as those of the above-described embodiment are denoted by the same reference numerals and description thereof is omitted.

  According to the mesh filter manufacturing injection mold 30a (hereinafter referred to as mold 30a) of this embodiment, a mesh filter 10a as shown in FIG. 4 can be manufactured. The mesh filter 10a has basically the same shape as the mesh filter 10 of the above embodiment, but is different in that a through hole 13 is not formed and a notch groove 14 is formed. Therefore, also in the metal mold 30a, the shape of the protrusion which is a part for forming the notch groove 14 is different.

  Specifically, as shown in FIG. 6, rib-like protrusions 45 a and 55 a protrude from the inner side surfaces of the cavities 41 and 51 of the lower mold 40 a and the upper mold 50 a so as to be connected to the support bases 43 and 53. It has a set shape. As shown in FIG. 5, a plurality of the protrusions 45a and 55a are provided at predetermined intervals along the inner side surfaces of the cavities 41 and 51, and correspond to when the lower mold 40a and the upper mold 50a are closed. The edge portions of the mesh member 11 are sandwiched by the mating surfaces 46 and 56 of the protrusions 45a and 55a. In addition, each protrusion 45a, 55a is formed so that it may be located in each edge | side part of the cavities 41 and 51 at a substantially equal space | interval, and this can support the edge part of the mesh member 11 with sufficient balance. .

  Since the process of manufacturing the mesh filter 10a using the mold 30a of this embodiment is the same as that of the above embodiment, the description thereof is omitted. However, according to the mold 30a of this embodiment, the mold of the above embodiment is used. Compared to the mold 30, the protrusions 45 a and 55 a are connected to the support bases 43 and 53, so that the advantage that the mold 30 a itself is relatively easy to manufacture is obtained.

It is a perspective view which shows one shape of the mesh filter manufactured with the manufacturing method of the mesh filter of this invention, and the injection mold for mesh filter manufacture. It is explanatory drawing which shows the upper mold | type in one Embodiment of the injection mold for the said mesh filter manufacture. It is explanatory drawing which shows one Embodiment of the manufacturing method of the same mesh filter, and the injection mold for mesh filter manufacture. It is a perspective view which shows the other shape of the mesh filter manufactured with the manufacturing method of the mesh filter of this invention, and the injection mold for mesh filter manufacture. It is explanatory drawing which shows the upper mold | type in other embodiment of the injection mold for the said mesh filter manufacture. It is explanatory drawing which shows other embodiment of the manufacturing method of the same mesh filter, and the injection mold for mesh filter manufacture. It is explanatory drawing which shows the upper mold | type of the conventional injection mold for mesh filter manufacture. It is explanatory drawing which shows the manufacturing method of the same mesh filter, and the injection mold for mesh filter manufacture.

Explanation of symbols

10, 10a Mesh filter 11 Mesh member 12 Frame member 30, 30a Injection mold for producing mesh filter (mold)
40, 40a Lower mold 41 Cavity 43 Support base 44 Matching surface (support base)
45, 45a Protrusion 46 Matching surface (protrusion)
50, 50a Upper mold 51 Cavity 53 Support base 54 Matching surface (support base)
55, 55a Protrusion 56 Mating surface (protrusion)

Claims (3)

The mesh member is disposed in an injection mold having a frame-shaped cavity and a support pedestal provided inside the cavity, and the mesh member is held by the mating surface of the support pedestal while maintaining the center of the mesh member. and injecting a resin into the cavity formed in the periphery of the member, the method of the periphery of the mesh member to produce a mesh filter which is held by a frame member made of resin,
When entering the inside of the cavity and closing the mold, the mesh member has a pin shape or a rib shape that partially sandwiches an edge arranged in the cavity, and the support base is aligned. A projection having a flat mating surface having the same height as the surface is formed on the inner surface of the mold, and each of the mating surfaces is placed in the cavity while the edge of the mesh member is partially sandwiched by the projection. A method for producing a mesh filter, characterized by injecting resin through runners provided in parallel and at different heights .   The method for manufacturing a mesh filter according to claim 1, wherein the resin is injected into the cavity while the corner portion of the mesh member is sandwiched between the protrusions at an edge portion of the mesh member. In an injection mold for producing a mesh filter in which the periphery of the mesh member is held by a resin frame member,
A frame-like cavity for molding the resin frame member;
A support pedestal that sandwiches a center portion of the mesh member with a mating surface and supports a peripheral portion of the mesh member by extending into the cavity;
No internal Cored write unnecessarily pin-like or rib-like said cavity from the inner surface of the mold, have flat mating surfaces of the same height as the mating surface of the support pedestal, closed perforated the mold Occasionally, provided with a collision force Metropolitan said that the edge portion which is disposed in the cavity of the mesh member partially interposed Soo,
One support pedestal of the mold is raised from the dividing surface, the other support pedestal of the mold is depressed from the dividing surface, and a runner communicating with the cavity is provided on the dividing surface of the mold mesh filters prepared for injection-molding die, characterized in that it is.

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