JP4737033B2 - Bonding structure between metal molded product and resin plate - Google Patents

Description

  The present invention relates to a structure in which a resin plate material is bonded to a metal molded product at an end thereof.

  Conventionally, various metal molded products and a resin are integrally joined to form a predetermined structure. In these joinings, for example, joining using an adhesive or insertion using a molten resin is performed. Joining by means such as molding (for example, see Patent Document 1) is performed.

  In these joinings, consideration is given to joining strength at the joining part, durability thereof, simplicity of joining operation, etc., and they are usually integrated so as not to be separated and disassembled.

  In such conventional joining, only the end of the resin plate is joined to a metal molded product to obtain a required structure. For example, as illustrated in FIG. 4, stainless steel, aluminum, etc. A structure having a hermetically sealed cavity 3 capable of preventing intrusion of water or the like by joining a seat portion 1 formed of the above metal and a toilet seat base 2 as a resin back plate at respective inner and outer peripheral edges. A heated toilet seat (Patent Documents 2-3) has been proposed.

However, in the case of the toilet seat having the hollow portion 3 as in the structure of FIG. 4, durability against a load stress at the time of sitting, deformation due to heat, strain stress, etc. when a heating heat source is arranged in the hollow portion 3. However, it becomes a big subject in the junction part of a metal molded product and a resin board. In the joint portion, the resin toilet seat base 2 is detached from the metal seat portion 1 due to repeated stress load at the time of seating, deformation or strain due to heat, and functions such as strength and sealing performance and heating performance as a toilet seat. This is because there is a concern that it will be lost.
JP 2004-50488 A JP 2005-110838 A JP 2005-192896 A

  From the background as described above, the present invention is not limited to the above example of the heated toilet seat, and when joining the resin plate to the metal molded product at its end, the joining operation is relatively simple. Provided with a new joint structure that has good penetration prevention properties such as water, can increase the strength at the joint, and can improve durability against deformation and strain due to heat. It is an issue.

  In order to solve the above problems, the joint structure of the present invention is characterized by the following.

1st: It is the joining structure of the resin plate material edge part in the back surface side of a metal molded product, Comprising: The step part is formed by insert resin molding inside the metal molded product back surface , This step part is made into a recessed part. In the insert resin layer in which the resin plate material provided with the projections to be inserted into the recesses is placed and integrally joined by the resin secondary molding, and the step portion is formed by the insert resin molding, the fiber length 5 A glass fiber of ˜15 mm is contained in a content range of 20 to 60 wt% .

1) Since the insert resin molding is performed by injection as a primary molding on the back inside of the metal molded article, Ru been attempted to improve the adhesion strength due to the integration.

  2) Since a step is formed in the resin layer by insert resin molding, a recess is formed, and the resin plate material is placed in a state in which the projection of the resin plate is inserted into the recess, so the end of the resin plate at the step The effect of preventing the detachment accompanying the fixing of the position of the part is exhibited, the detachment and decomposition due to the load stress at the joint part are suppressed, and the positioning for the secondary molding becomes easy.

  3) Since secondary molding is performed by welding the resin at the step, it is possible to absorb strength, functions such as strength and water penetration prevention, load stress, heat deformation and strain, and durability. It will be excellent.

  4) Since specific glass fiber is contained in the insert resin layer, the reinforcing effect by this becomes large.

  The effects as described above are also remarkable in the structure of the heated toilet seat as shown in FIG.

In the joining structure of the present invention, the type and composition of the resin for insert resin molding as the primary molding and the secondary molding, and the type of the resin plate material are not limited. It is a thermoplastic resin that is capable of insert resin molding and secondary molding as injection molding, and can be selected in consideration of the predetermined performance and application of the structure of the present invention. For example, a polyolefin resin such as polypropylene (PP) resin, an acrylic resin, a methacrylic resin, a polyester resin such as a polybutylene terephthalate (PBT) resin or a polyethylene terephthalate (PE) resin, or a polycarbonate (PC) resin is selected. It's okay. These resins further include high-strength fibers such as glass fibers, carbon fibers, and aramid fibers, reinforcement of inorganic fillers such as calcium carbonate, calcium silicate, silica, talc, glass beads, and quartz powder, Colorants, viscosity modifiers, catalysts, and the like may be appropriately blended. About these compounding components, it is desirable to form a resin layer so that it may approximate the linear expansion coefficient of the raw material metal of a metal molded product by mixing. For this reason, for example, in the case of aluminum metal, it is preferable to mix glass fibers with a resin. For glass transition blending, the longer one can generally reduce the strain due to heat, but it is too long. Therefore, the fiber length is preferably in the range of 5 to 15 mm.

  Similarly, when the content of the glass fiber is too large, it is difficult to perform insert molding. About a fiber diameter, what is necessary is just to exist in the range of the glass fiber mix | blended with resin normally.

  About a resin board material, various things, such as a thing by a thermoplastic resin or a thing by a thermosetting resin, may be sufficient. More preferably, it is considered that the thermoplastic resin plate further strengthens the welding in the secondary molding. The metal molded product may also be a composite material of various metals such as stainless steel and aluminum, alloy materials, and ceramics and resins.

  In the joint structure of the present invention, for example, the same toilet seat as in FIG. 4 is taken as an example, and as shown in the cross-sectional view of the main part of FIG. The insert resin layer 4 is formed by insert resin molding according to the above, and the resin layer 4 is provided with a recess 5 as a stepped portion. Then, an end projection 6 of a resin plate material as the toilet seat base 2 is inserted into the recess 5, and the secondary molding resin 7 is filled and welded to the recess 5 by secondary molding to form a strong bond. Thereby, the metal molded product as the seating portion 1 and the resin plate material as the toilet seat base 2 are integrally joined. And both constitute the cavity 3.

  FIG. 2 illustrates a molding process for forming the structure of FIG. The process is as follows.

  <a> Insert resin molding of PP resin containing, for example, 40 mm% of glass fiber having a length of 11 mm with respect to the inner peripheral surface on the inner side of the back surface of a metal molded product as the seating portion 1, for example, an aluminum sheet metal molded product And the insert resin layer 4 and the recessed part as a step part are formed by welding.

  In order to increase the adhesion strength of the insert resin layer 4 to the inner side of the back surface of the metal molded product, if necessary, the inner side of the back surface of the metal molded product may be ammonia, hydrazine, pyridine, or A cleaning treatment using an amine compound or the like may be performed, or an adhesive mainly composed of a maleic anhydride-modified polypropylene resin having a good affinity with the PP resin may be applied in advance. Such a cleaning agent or adhesive can be appropriately selected according to the type and properties of the metal and the resin.

  The operating conditions (metal temperature, injection speed, etc.) for insert resin molding can be suitably determined based on the prior art. The molding temperature is, for example, in the range of 250 ° C. to 260 ° C. as in the case of ordinary PP resin.

  <B> Next, for example, an end protrusion 6 of a PP resin plate material as the toilet seat base 2 is inserted into the recess 5.

  About the magnitude | size and shape of the recessed part 5 and an edge part protrusion, the edge part protrusion 6 of a resin board material is inserted, and it sets as what is resin-filled as secondary molding.

  More preferably, it is considered that the end projection 6 has a size and shape that are easy to position for insertion and difficult to prevent. In the structure of the present invention, the end protrusion 6 does not need to be fitted to the recess 5, so that tolerance to dimensional errors is large.

  The secondary molding resin 7 which is a PP resin is injected and injected into the <c> recess 5 by secondary molding, and is solidified by welding. This completes the joining.

  Also in this case, the molding conditions can be suitably determined based on the prior art. For example, the molding temperature is in the range of 250 ° C. to 260 ° C.

  The dimensions such as the depth and width (length) of the recess 5 are suitably determined in consideration of the type and nature of the resin and the required characteristics.

  Of course, if necessary, the joint exposed surface is polished after the secondary molding.

  By the above process, for example, when a toilet seat is formed, the above-described joint structure can be formed in the entire inner periphery and outer periphery or in part. Forming the above-mentioned joint structure in the entire area results in a toilet seat that is strong, durable, and excellent in heat-resistant deformation, suppresses water intrusion, and has excellent durability for heat transfer even in a heated toilet seat in which a heat source is disposed in the cavity 3 An excellent toilet seat will be realized.

  FIG. 3 is a cross-sectional view of a main part illustrating another embodiment different from the case of FIG. 1 and FIG. In this embodiment, the insert resin layer 4 is formed with a stepped portion 8 as a stepped portion having a shape different from that of the concave portion 5. In the structure of the present invention, the step portion formed by insert resin molding may have various shapes as described above. An end portion of the toilet seat base 2 as a resin plate material is placed on the stepped portion 8 and integrally joined by secondary molding using the secondary molding resin 7.

  Of course, in the present invention, it is not limited to such a toilet seat structure, and is suitably applied as a joint for molded products of various shapes and sizes.

It is the fragmentary sectional view which illustrated the junction structure as one embodiment of the present invention. It is a partial section process flow figure which illustrated the formation process of the junction structure as one embodiment of the present invention. It is the fragmentary sectional view which illustrated the junction structure as another embodiment. It is sectional drawing which showed the conventional structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Seating part 2 Toilet seat base 3 Cavity part 4 Insert resin layer 5 Recessed part 6 End part protrusion 7 Secondary molding resin 8 Step part

Claims (1)

It is a joining structure of the resin plate material end on the back side of the metal molded product, and a step portion is formed by insert resin molding inside the metal molded product back surface, and this step portion is a recess , A resin plate material provided with projections to be inserted into the recesses is placed and integrally joined by resin secondary molding, and an insert resin layer in which a step portion is formed by insert resin molding has a fiber length of 5 to 15 mm. Glass fiber is contained in a content range of 20 to 60 wt%, a joining structure of a metal molded product and a resin plate material.

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