JP6188193B2 - Method for assembling cyclic resin product and cyclic resin product - Google Patents

Description

  The present invention relates to a method for assembling a cyclic resin product and a cyclic resin product, and more specifically, a resin-made thin frame-like annular body is assembled to an assembly by caulking, welding, or press fitting. The present invention relates to a method and a cyclic resin product.

Conventionally, an annular resin product such as a gasket with a frame for sealing a joint surface between a cover body and a main body is known (see, for example, Patent Document 1).
In various industrial fields, an annular product such as an O-ring is often assembled to an assembly (see, for example, Patent Document 2). In this case, the annular product is gripped by a robot hand or the like, placed at a predetermined position of the assembly, and then assembled by pushing the annular product into an O-ring groove formed on the assembly. Made.

JP 2000-257719 A JP 2009-291859 A

  By the way, when it is going to manufacture the cyclic resin product like patent document 1 by injection molding, when removing the cyclic resin product from a shaping | molding die, a cyclic resin product will be distorted and deform | transformed by the residual distortion at the time of shaping | molding. A situation may occur. When the annular resin product is deformed, for example, when the annular resin product is gripped using a robot hand as in Patent Document 2, the operation of the robot hand is controlled in consideration of the deformation of the annular resin product. There is a need. In addition, when the annular resin product is correctly assembled, for example, in the assembly groove formed in the assembly, it must be assembled after correcting the deformation of the cyclic resin product, and the assembly work is complicated. become.

  The present invention has been made in view of the above circumstances, and at least the annular body can be correctly assembled at a predetermined position by suppressing deformation of the resin-made annular body until the annular body is assembled to the assembly. It aims at providing the assembly method of the cyclic resin product which can be performed, and a cyclic resin product.

The method of assembling the annular resin product according to the first invention is a method of assembling the annular resin product assembling the resin annular body to be assembled body provided with a pin, said annular body, the inside portion An inward tab having a through hole at a position corresponding to the pin is provided , and the annular body and a reinforcing member separable from the annular body are integrally formed through the tab , and then the reinforcing member is supported to support the reinforcing member. An annular body is disposed on the assembled body, and the pin is press-fitted into the through hole to perform caulking, whereby the annular body is assembled to the assembled body, and the reinforcing member is It is characterized by being separated from the annular body.
According to the present invention, since the annular body is provided with the reinforcing member until the annular body is assembled to the assembly, the annular body is assembled to the assembly with the deformation of the annular body suppressed. be able to. Therefore, the annular body can be correctly assembled at a predetermined position of the assembly without complicating the assembly work of assembling the annular body to the assembly. And since it can caulk in the state which suppressed the deformation | transformation of the annular body by presence of the reinforcement member, it can caulking easily. Furthermore, it can suppress that the positional relationship of a pin and a through-hole shift | deviates by presence of a reinforcement member. Therefore, the work of press-fitting the pin into the through hole is accurately performed.

In the present invention, the caulking may be a thermal caulking.
According to the present invention, when caulking with heat, even if the annular body is affected by heat, the annular body can be prevented from being thermally deformed.

In the present invention, the reinforcing member is formed with a protruding portion that protrudes in the axial direction of the annular body rather than the annular body. After the annular body and the reinforcing member are integrally formed, the protruding portion is formed into another annular shape. A plurality of the annular bodies may be aligned so as to abut against the reinforcing member of the body, and then the assembly of the annular body to the assembly to be assembled may be performed.
ADVANTAGE OF THE INVENTION According to this invention, when aligning a some annular body to an axial direction, it can suppress that an annular body interferes.

An annular resin product according to a second aspect of the present invention is an annular resin product including a resin-made annular body that is assembled to an assembly, and the annular body includes an inward tab having a through hole in an inner portion. A separable reinforcing member is integrally formed on the annular body via the tab, and the reinforcing member is separated from the annular body in a state where the annular body is assembled to the assembled body. It is characterized by being.
According to the present invention, since the reinforcing member is separated in a state where the annular body is assembled to the assembly body, the annular member is reinforced by the reinforcing member, and the deformation is suppressed in a state where deformation is suppressed. It is assembled correctly at the position.

  According to the method for assembling the cyclic resin product and the cyclic resin product of the present invention, at least until the annular body is assembled to the assembly, the annular body is prevented from being deformed by suppressing deformation of the resin-made annular body. Can be assembled correctly in position.

It is a schematic plan view which shows an example of the cyclic resin product used for the assembly method of the cyclic resin product which concerns on this invention. It is a perspective view which shows an example of the to-be-assembled body used for the assembly method of the same cyclic resin product. It is process drawing which shows an example of the assembly | attachment method of the cyclic resin product which concerns on this invention. FIG. 2 is an enlarged cross-sectional view showing the point of molding of the cyclic resin product shown in FIG. 1 and corresponding to the portion indicated by arrows AA in FIG. 1. It is sectional drawing equivalent to the AA arrow line part of FIG. 1 which shows the state which assembled | attached the cyclic resin product shown in FIG. 1 to the to-be-assembled body shown in FIG. 2, and isolate | separated the reinforcement member after that. It is a schematic plan view which shows the reference example of the cyclic resin product used for the assembly method of the cyclic resin product which concerns on this invention. It is a perspective view which shows an example of the to-be-assembled body used for the assembly method of the same cyclic resin product. FIG. 8 is a cross-sectional view corresponding to the section taken along line B-B of FIG. 6, showing a state where the reinforcing member is separated after the annular resin product shown in FIG. 6 is assembled to the assembly shown in FIG. 7. It is a schematic top view which shows another reference example of the cyclic resin product used for the assembly method of the cyclic resin product which concerns on this invention. (A) (b) is a schematic plan view which shows another reference example of the cyclic resin product used for the assembly method of the cyclic resin product which concerns on this invention. The modification of the cyclic resin product used for the assembly method of the cyclic resin product according to the present invention is shown, (a) is a schematic plan view of the cyclic resin product, and (b) is a laminate of the cyclic resin products. It is sectional drawing corresponding to CC line arrow part of (a) of the state which was made.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic plan view showing an example of a cyclic resin product used in the method for assembling a cyclic resin product according to the present invention. An annular resin product 1 shown in FIG. 1 has a rectangular thin frame-like annular body 10, and an inward tab 12... Is formed at the center of each side portion 11. Is formed. The annular body 10 is formed in a thin plate shape, in other words, a thin frame shape. Therefore, the annular body 10 is formed in a shape that has low rigidity and is easily bent and deformed. The plurality of tabs 12 are integrally formed with a cross-shaped reinforcing member 2 in plan view through a broken portion 20 formed thinner than the annular body 10. Each of the tabs 12 corresponds to a plurality of pins 31 (four in this embodiment) formed on the assembly 3 (see FIG. 2) described later, and the pins 31 are press-fitted. Possible through holes 13 are provided. The fracture | rupture part 20 is formed in the shape which can be cut | disconnected with cutting tools, such as a nipper. The reinforcing member 2 has higher rigidity than the annular body 10 in order to restrict the annular body 10 from being distorted or twisted. The reinforcing member 2 includes a pair of rod-like portions 2 a and 2 b that form a cross-shaped shape, and the rod-like portions 2 a and 2 b are bridged so as to be orthogonal to the side portion 11 of the annular body 10.

FIG. 2 shows an assembled body 3 to which the annular resin product 1 is assembled. The illustrated assembled body 3 includes a rectangular parallelepiped hollow box 30 having one surface (upper surface) opened, And a plurality of pins 31 provided on the upper surface of the box 30. The box 30 is made of a metal material or a resin material. The pin 31 is made of a material that can be deformed by heat caulking, and is provided at a predetermined portion on the upper surface of the box 30. The outer surface of the annular body 10 is shaped to match the outer edge of the box body 30 when the annular body 10 is assembled to the upper surface of the box body 30 as will be described later. The through holes 13 are provided at positions corresponding to the pins 31 in the assembled state. The inner surface of the annular body 10 is shaped to be located outside the opening edge 30 a of the box body 30 when the annular body 10 is assembled to the upper surface of the box body 30.

A procedure for molding and assembling the annular resin product 1 as described above to the assembly 3 will be described with reference to FIGS. In the molding step S1 of the annular resin product 1, the annular body 10 and the reinforcing member 2 are integrally molded. FIG. 4 shows a procedure for molding the cyclic resin product 1 by a molding apparatus. A molding apparatus 4 shown in FIG. 4 is an injection molding apparatus, and includes a lower mold 41 and an upper mold 42, and a cavity 43 corresponding to the shape of the annular resin product 1 is formed in a state where both molds 41 and 42 are clamped. Is done. The cavity 43 includes an annular portion 43a which corresponds to the annular body 10, and the tab-like portion 43b corresponding to the tabs 12, more composed and cross-shaped portion 43c which corresponds to the reinforcing member 2 of the cross-shaped. A resin injection sprue 44 is provided on the upper mold 42 at a portion corresponding to the intersecting portion 43d of the cross-shaped portion 43c. Since the reinforcing member 2 formed by the cross-shaped portion 43c is finally separated and removed as described later, the cross-shaped portion 43c is used for forming the annular body 10 and the tabs 12. It can be said that it corresponds to a runner.

  In the molding apparatus 4 shown in FIG. 4, the molten resin r is injected from the sprue 44 and molded into a shape corresponding to the cavity 43, and then the reinforcing member 2 is gripped to form the annular resin product 1 into the molding apparatus 4. The cyclic resin product 1 as shown in FIG. When the annular resin product 1 is demolded, the annular body 10 may be distorted and deformed due to residual strain at the time of molding. However, since the annular body 10 is reinforced by the reinforcing member 2, such deformation is caused. It is suppressed.

  Next, the annular resin product 1 is assembled to the assembly 3 as shown in FIG. 2 (assembly step S2 to the assembly). At the time of this assembly, the reinforcing member 2 is gripped by the robot hand 5 as shown in FIG. 5, the annular resin product 1 is transported and positioned on the assembly 3 and the through holes 13 and the pins are gripped. Alignment with 31 is performed. Then, the annular resin product 1 is lowered toward the assembly 3 and the through holes 13 are press fitted into the pins 31 (the pins 31 are press fitted into the through holes 13).

Thereafter, in the present embodiment, each pin 31 is heat caulked to fix the tabs 12 to the upper surface of the assembly 3. As shown in the enlarged portion of FIG. 5, the pin 31 is melted and deformed from the original shape indicated by the two-dot chain line into a bowl shape as indicated by the solid line, and the tabs 12 are clamped on the upper surface of the assembly 3. To fix. The heat caulking process is performed by pressing the pin 31 into the tab 12 and then hitting the pin 31 with a hammer or the like while heating.

Thereafter, in the reinforcing member separation step S <b> 3, each fractured portion 20 is cut by a cutting tool provided in the robot, and the reinforcing member 2 is separated. Thereby, the assembly of the resin annular body 10 to the assembly 3 is completed. FIG. 5 shows a state in which the annular resin product 1 is assembled to the assembly 3 in the above-described manner and the reinforcing member 2 is separated. The annular body 10 is subjected to heat caulking of the pins 31. It is assembled and fixed to the assembly 3 so that it cannot be detached.
It should be noted that the annular body 10 may be assembled and fixed to the assembly 3 via the pins 31 in a non-detachable manner by snap fitting or E-ring instead of the heat caulking of the pins 31.

In the present embodiment, the transfer and press-fitting operations are performed in a state where the reinforcing member 2 is gripped by the robot hand 5. Accordingly, the annular body 10 is not damaged by the robot hand 5 in the course of the transfer and press-fitting operations. Further, since the deformation of the annular resin product 1 is suppressed, it is not necessary to control the operation of the robot hand 5 in consideration of the deformation of the annular resin product 1 when the reinforcing member 2 is gripped by the robot hand 5.
And since the reinforcing member 2 is attached to the annular body 10 until the annular body 10 is assembled to the assembly 3, the annular body 10 is assembled to the assembly 3 with the deformation of the annular body 10 suppressed. Can do. In particular, the positional relationship between the pins 31... And the through holes 13 is difficult to shift, and the press-fitting operation of the pins 31 to the through holes 13. Further, during the press-fitting operation of the pin 31, a strong stress acts on the annular body 10, but since the reinforcing member 2 is integrated with the annular body 10, the deformation of the annular resin product 1 is suppressed. The press-fitting operation is performed. In addition, since the deformation of the cyclic resin product 1 is suppressed, it is not necessary to perform the assembling operation by press-fitting after correcting the deformation of the cyclic resin product. Thereby, the annular body 10 can be correctly assembled at a predetermined position of the assembly 3 without complicating the assembling work of the annular body 10.
Further, when the heat caulking process is performed, a strong stress such as deformation due to strain or the like acts on the annular body 10. However, since the annular body 10 is reinforced by the reinforcing member 2, the annular resin product 1 is fixed at a predetermined position in a state where deformation of the annular body 10 is suppressed.

6-8 has shown the reference example of the assembly | attachment method of the cyclic resin product which concerns on this invention. An annular resin product 1A shown in FIG. 6 includes an annular annular body 10A, and a cross-shaped reinforcing member 2A made up of rod-shaped portions 2Aa and 2Ab integrally formed on the inner side of the annular body 10A via a fracture portion 20A. Consists of. This cyclic resin product 1A is similarly molded by the molding apparatus 4 shown in FIG. 4 provided with a cavity corresponding to the cyclic resin product 1A. Accordingly, since the annular body 10A is reinforced by the reinforcing member 2A, the annular resin product 1A is in a state in which the deformation at the time of demolding is suppressed as described above. FIG. 7 shows a to-be-assembled body 3A to which the annular resin product 1A is assembled, and the to-be-assembled body 3A is composed of a hollow cylindrical body 30A, and an annular recess is formed at the upper end opening of the cylindrical body 30A. The locations 31A are formed in steps. The inner diameter D (see also the enlarged portion in FIG. 8) of the annular recess 31A is slightly smaller than the outer diameter D1 of the annular body 10A.

  When assembling the annular resin product 1A to the assembly 3A, the annular resin product 1A is attached to the assembly 3A with the reinforcing member 2A held by the robot hand 5 (see FIG. 5) similar to the above. Position on top of. Then, the annular body 10A is press-fitted into the inner diameter portion of the annular recess 31A. During the press-fitting, the outer peripheral edge of the annular body 10A, and if necessary, the inner diameter part of the annular recess 31A may be heated to fix the annular body 10A to the annular recess 31A by welding. Further, when the annular body 10A is press-fitted into the annular recess 31A, the outer peripheral edge portion of the annular body 10A may be caulked to be integrated with the annular recess 31A. Furthermore, as the welding process, a method using vibration, ultrasonic waves, a hot plate, a laser, or the like can be employed.

  Thereafter, the fracture portion 20A is cut to separate the reinforcing member 2A from the annular body 10A, whereby the assembly of the annular resin product 1A to the assembly 3A is completed. FIG. 8 shows a state where the reinforcing member 2A is separated from the annular body 10A, and the assembly of the annular resin product 1A to the assembly 3A is completed. Until the annular body 10A is assembled to the assembly 3A, the annular body 10A is provided with the reinforcing member 2A. Therefore, the annular body 10A can be assembled to the assembly 3 with the deformation of the annular body 10A suppressed. . Further, during the press-fitting operation of the annular body 10A into the annular recess 31A, strong stress acts on the annular body 10A, but the reinforcing member 2 is integrated with the annular body 10A. The press-fitting operation is performed with the deformation suppressed. Further, even when the welding process is involved as described above, the annular body 10A may be thermally deformed by the influence of heat, but such deformation is also suppressed by the reinforcing member 2A. Thereby, the annular body 10 can be correctly assembled at a predetermined position of the assembly 3 without complicating the assembling work of the annular body 10.

FIG. 9 is a schematic plan view showing still another reference example of the cyclic resin product used in the method for assembling the cyclic resin product according to the present invention. In this example, the shape of the cyclic resin product obtained in the cyclic resin product molding step S1 (see FIG. 3) is different from the example of FIG. That is, the rectangular annular body 10 in this example does not have the tab 12 as shown in FIG. The through hole 13 into which the pin 31 (see FIG. 2) is press-fitted is provided at an appropriate position of the annular body 10. The reinforcing member 2 in this example is directly connected to the inner portion of the annular body 10 . Also in this example, due to the presence of the reinforcing member 2, distortion deformation at the time of molding the annular resin product 1 is suppressed, and deformation in the process of transporting to the assembly and assembly is suppressed in the same manner as described above. .
Since the other configuration is the same as the example shown in FIG. 1, the same reference numerals as those in FIG.

10A and 10B are schematic plan views showing still another reference example of the cyclic resin product used in the method for assembling the cyclic resin product according to the present invention. In this example, the shape of the cyclic resin product obtained in the molding step S1 of the cyclic resin product (see FIG. 3) and the shape of the reinforcing member are different from the example of FIG. That is, the rectangular annular bodies 10B and 10C in this example do not have the tab 12 as shown in FIG. And in the cyclic resin product 1B of the example of (a) figure, the reinforcement member 2B is made into the H shape which consists of rod-shaped part 2Ba, 2Bb, 2Bc in planar view, (b) In the cyclic resin product 1C of the example of a figure, When viewed from above, the rod-shaped portions 2Ca and 2Cb are formed in an X-shape, and the reinforcing members 2B and 2C are both connected to the opposing long sides of the annular bodies 10B and 10C via the breaking portions 20B and 20C. Has been. Such annular resin products 1B and 1C are set so that the shape of the cavity in the molding apparatus 4 shown in FIG. 4 corresponds to the shape of the annular resin products 1B and 1C shown in FIGS. Molded by the molding device 4. Also in this case, a resin injection sprue (not shown) is provided at a portion corresponding to the central portion of each of the reinforcing members 2B and 2C, and the annular bodies 10B and 10C and the reinforcing members 2B and 2C are integrally formed, respectively. . Since the annular bodies 10B and 10C are also reinforced by the reinforcing members 2B and 2C in the annular resin products 1B and 1C, the deformation at the time of demolding is suppressed as described above. In the same manner as described above, with the reinforcing members 2B and 2C being held by the robot hand 5 (see FIG. 5), the above-described press fitting, caulking, heat caulking, and heat The reinforcing members 2B and 2C are separated after being assembled by welding or the like. Also in these examples, due to the presence of the reinforcing members 2B and 2C, distortion deformation at the time of molding of the cyclic resin products 1B and 1C is suppressed, and the deformation in the process of transporting and assembling to the assembly is performed as described above. Is suppressed as well.

FIG. 11 shows a modified example of the cyclic resin product used in the method for assembling the cyclic resin product according to the present invention. FIG. 11 (a) is a schematic plan view of the cyclic resin product, and FIG. It is sectional drawing corresponding to CC line | wire arrow line part of the (a) figure of the state which laminated | stacked the cyclic resin product in multiple numbers. The cyclic resin product 1D obtained in this example has a reinforcing member 2D provided with a protruding portion 21D protruding in the axial direction of the annular body 10D from any part of the annular body 10D. To do. In the illustrated example, the protrusions 21D are formed in parallel and with the same dimensions so as to stand on the reinforcing member 2D at four locations in the vicinity of the neck portions 20D. The protrusion 21D has a flat tip surface. The protrusion 21D is simultaneously molded together with the annular body 10D and the reinforcing member 2D in the annular resin product molding step S1. Then, after the molding step S1 of the cyclic resin product, the protrusions 21D support the reinforcing members 2D of the other cyclic resin products 1D as shown in FIG. Align like so. In this way, a plurality of cyclic resin products 1D are stacked, and in this state, they are carried into the assembly step S2 to be assembled or temporarily stored, and then each of the cyclic resin products 1D is assembled in the same manner as described above. Assembling is carried out.
In this carrying-in or storage process, the protrusions 21D... Have a spacer function, so that the annular bodies 10D do not interfere with each other, the annular body 10D is prevented from being damaged, and the annular resin product 1D is more deformed. Effectively suppressed. Then, the assembly step S2 to the assembly is performed in the same manner as described above, but after the assembly step S2 to the assembly, the reinforcing member 2D is separated by cutting together with the protrusions 42. The assembly of the annular body 10D to the assembly is performed.

In FIG. 11, the plurality of annular resin products 1D are stacked such that the protruding portion 21D supports the reinforcing member 2D of the other annular resin product 1D, but the protruding portion 21D is below the annular body 10D. A plurality of cyclic resin products 1D... May be arranged so as to be stacked and function as legs of the cyclic resin product 1D.
In FIG. 11, a plurality of annular resin products 1D are aligned so as to be stacked one above the other in a flat state. However, the annular resin products 1D are aligned so as to be vertically stacked in the horizontal direction. May be. Thus, when a plurality of cyclic resin products 1D... Are aligned and stored or transported, for example, it is convenient to prepare a dedicated tray and align it. Alternatively, a plurality of annular resin products 1D... May be aligned in the lateral direction by hanging an annular body on a horizontally extending long pin.

In addition, the illustrated cyclic resin products 1 to 1D and the reinforcing members 2 to 2D are not limited to the illustrated ones, and are designed according to the shape of the assembly target of the resin cyclic bodies 10 to 10D as the final product. Needless to say, it is set appropriately. For example, an annular resin product in which an elastic body such as rubber is formed on the outer periphery of the annular body 10 to 10D may be used.
Further, for example, as the shape of the reinforcing member, a plate-like member arranged in a rectangular or circular annular body and connected to the inner part of the annular body via a plurality of linear parts (breaking parts) can also be adopted. is there.
Instead of supporting and transporting the reinforcing member of the annular resin product, the annular body may be supported and transported. For example, when the reinforcing member has a shape that is difficult to grasp by the robot hand, the annular member may be supported and conveyed. However, in this case, it is necessary to take measures for preventing damage to the annular body so that the function of the cyclic resin product can be maintained.
Furthermore, the positional relationship when the annular body 10 is assembled to the upper surface of the box 30 as shown in FIG. 1 is not particularly limited. For example, the annular resin product may be assembled to the box 30 so that the outer surface of the ring 10 does not align with the outer edge of the box 30. Alternatively, the annular resin product 1 may be assembled to the box body 30 so that the inner surface of the ring body 10 is aligned with the opening edge 30 a of the box body 30.

  In addition, as examples of the method of assembling the cyclic resin product to the assembly, press-fitting, caulking, heat caulking, and welding are exemplified, but other than these, for example, external fitting, screwing, screwing, adhesion, etc. In addition, these can be used in combination as appropriate. The method for assembling the annular resin product of the present invention is applied to various industrial fields. For example, a head cover of an automobile engine is used as an assembly, and a resin head cover gasket as an annular body is assembled into the head cover. In this case, the oil pan is preferably used when the oil pan is assembled and a resin oil pan gasket as an annular body is assembled to the oil pan. Alternatively, it is preferably employed when various piping is used as an assembly and a resin joint member as an annular body is assembled to the piping. Further, the present invention is also used when a box that houses an electronic device such as an integrated circuit is used as an assembly and a resin gasket as an annular body is assembled to the box.

1-1D cyclic resin product 10-10D annular body 13 through-hole 2-2D reinforcing member 21D protrusion 3,3A assembly 31 pin 31A annular recess (recess)

Claims (4)

In the assembling method of the annular resin product in which the resin annular body is assembled to the assembly with the pin ,
The annular body includes an inward tab having a through hole at a position corresponding to the pin on the inner side ,
The annular member and a reinforcing member separable from the annular member are integrally formed through the tab ,
Thereafter, the annular body is arranged on the assembly by supporting the reinforcing member, placing the annular body on the assembly, and press-fitting the pin into the through hole to perform caulking. And attaching the annular resin product, wherein the reinforcing member is separated from the annular body. In the assembly method of the cyclic resin product according to claim 1,
The method of assembling a cyclic resin product, wherein the caulking is heat caulking . In the assembly method of the cyclic resin product according to claim 1 or 2,
The reinforcing member is formed with a protrusion protruding in the axial direction of the annular body from the axial end surface of the annular body,
After the annular body and the reinforcing member are integrally molded, the plurality of annular bodies are aligned so that the protrusions abut against the reinforcing members of the other annular bodies, and then the annular body is attached to the assembled body. A method for assembling a cyclic resin product, wherein the assembling is performed. In the annular resin product provided with the resin-made annular body to be assembled to the assembly,
The annular body includes an inward tab having a through hole on the inner side,
A separable reinforcing member is integrally formed on the annular body via the tab, and the reinforcing member is separated from the annular body in a state where the annular body is assembled to the assembled body. A cyclic resin product characterized by being a product.

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