JPS5859035A - Coupling method for resin components - Google Patents

Abstract

PURPOSE:To effectively improve a coupling strength of connection made between two resin components, by a method wherein, in case the two resin components are connected by a welding, concavities are formed in the connecting surface of one resin component, and the fused substance of the other component is caused to enter the concavities. CONSTITUTION:In case two resin components 12 and 14 are coupled by a welding at flange parts 16 and 18 of the components 12 and 14, respectively, an appropriate number of perforating circular holes (concavities) 20 is formed at given intervals in one flange part 18. The resin component 14, in which the concavities 20 are formed, is made of resin, for example, ABS resin, having a higher melting point than that of resin, i.e., polypropylene, of which the other resin component is made. After the two flange parts 16 and 18 are brought into contact with each other, the connecting surfaces are fused by a reciprocating friction welding as they are pressed against each other by a given pressure, the fused resin of the one flange part 16 is pushed into the concavities 20 in the other flange part 18, and with this they are cooled for curing.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for joining resin parts, and relates to a method that can increase the joining strength between two resin parts when joining them by welding to a fence.

Traditionally, products have been joined to two pieces of paulownia by various welding methods such as friction welding, high-frequency welding, sonic welding, and hot air welding. ηI1
What makes them come into close contact, the bond between them! A major challenge was how to increase the ljLlj degree by fl'I]. Q. 'J, if these two resin parts are of different types, the physical properties of both parts (liI!
Since the li point, crystallinity, polarity, etc. are different, it is not possible to melt and bond the IK joint surfaces at the same time, so it was necessary to take some measures for joining. be.

For this reason, as can be seen in Japanese Patent Application Laid-Open No. 53-86772, when two resin parts made of different materials are joined together by 1", the first t
Place the ``i13 item and the 2nd) 713 item of other i'' quality at the joint position 8'=□-, and place the 3rd) part in the same side chamber as the first part. placing one piece in contact with the first part so as to engage the second part, and ultrasonically welding the first part and the third part;
A method has been proposed in which the second part, which appears on the first part, is fixed (one-piece) through the third part.

However, various joining methods θ that have been proposed so far
Ku-Izuno) is still not good enough, especially different i゛! I
In the case of f-kid Oni 1, directly refer to those different species A.
A Rima σ month? Since there is no component for f-joining, and a joining structure is adopted through a third part made of the same pressed material, there are a large number of H1X products, and a large number of H1X products as well. There were four confusing parts.

Here, when two resin parts are joined by a predetermined first operation of the present invention Gj1, 1. The purpose is to provide a joining method that effectively connects parts to !lG+ without intervening a third part. : The purpose is to provide a method that can be used directly.

Therefore, when joining the two resin parts according to the present invention ζJ by welding Q, by providing a recess in the joint surface of the parts on at least one resin table 1 and applying a welding operation,
While allowing the molten material produced by the melting of the joint 1 of the other resin part to enter the recess, the resin part 1' of the other resin part is
1Σ of ii'l, a coffin characterized in that the artificial part of the recess is narrowed by melting or softening the base surface so that the melt of the one resin component is held within the recess; The problem lies in the method of joining fat parts.

According to the method of the present invention, the molten material of the other resin component enters the recess provided in the joining surface of one resin component by a predetermined welding operation, and the By narrowing the artificial part of the recess and assimilating it instead of holding it, an effective anchoring effect is produced, and therefore a high bonding strength is achieved between these two parts. It is.

Below, we will look at the present invention in more detail by referring to the first part! 'J.

First, in Fig. 1, 10 is a 1Δ
The product 10 is made of two semi-cylindrical sections 12.14 formed by resin injection molding, etc. They are joined at the flange portion by a proper welding operation.

By the way, one of these semi-cylindrical members 12
As shown in FIG. 2, it has a semicircular MI shape, and on both sides of the radial direction, flange portions 16 of a predetermined length 11 and 1llII'j integrally protrude in the axial direction. For example, here it is made of a resin such as polypropylene (PP). The other semi-cylindrical member 14 has a semi-cylindrical shape as shown in FIG. Shape A: Both sides of AI4 ☆: l
A flange portion 18 having approximately the same width and length as the flange portion 16 of the Mif semi-cylindrical portion 4A12 is integrally formed on the a sound IX.

5- The flange portion 18 is provided with an appropriate number of through circular holes (recesses) 20 at predetermined intervals in the longitudinal direction thereof. In addition, the semi-cylindrical part! Here, A14 is, for example, A whose melting point is slightly higher than that of the one semicylindrical member 12.
It is made from a resin called HS resin.

Therefore, when joining, after bringing the flanges 16, 18 (joining surfaces) of the amphiphilic cylindrical member 12, 14 having such a configuration into contact with each other, the joining surfaces are pressed against each other with a predetermined pressure, for example. A welding operation such as reciprocating friction welding in which both flanges 16 and 18 are reciprocated in the longitudinal direction will be added. The frictional heat generated by this operation heats the respective joint surfaces, so that the resin side slope: PP whose melting point is slightly lower than that of the other semi-cylindrical part 14 is heated.
Flange part 1 of one semi-cylindrical part side 12 made of
6 is melted, and the melt produced by the melting, the so-called Paris, forms another semi-cylindrical shape=lt)l:A' 16
It comes to enter the circular hole 20 formed in the flange portion 18 of.

6- On the other hand, the semi-cylindrical sound 1 (U' 14 flange part 18 made of ABS resin side layer whose melting point is slightly higher than that of PP)
Due to the MW<heat generated during the welding operation, one semi-cylindrical part 12 is bent and melted! The flange noise 1 will be softened, and along with this melting or softening, the flange noise 1 will be reduced by the action of the pressing force applied to the joint surfaces of both members, and by the action of the joint 1.
The entrance portion of the circular hole 20 provided in the hole 18 is narrowed,
n? that entered the circular hole 20? (2) The melt of the flange portion 16 fl (11) of one semi-cylindrical HIS4U' 12 is held in the circular hole 20.

Figures 4(a) to (d) show the melting and softening behavior of the joint surfaces of each flange portion 16 and 18 due to such a melting operation.
) is specifically shown. That is, as shown in FIG. 4(a), the molten material (paris) of the flange portion 16 generated when the flange 16 and 18 are pressed against the two flange parts 1 and slid back and forth relative to each other in the direction of the arrow 22. 17 is (
1)) to (C) and then (d) into the circular hole 20 of the other flange portion 18, - by melting or softening of the universal flange portion 18, the entrance portion 21 of the circular hole 20 becomes narrower (smaller in diameter) as shown in (C) → ((1))
, thereby holding the melt 17 in the circular hole 20, and cooling and solidifying it in the state (d), thereby forming an effective gap between the flange portions 16.18, and thus between the two sections 12.14. Direct bonding can be achieved.

Therefore, such a joining method has the great advantage that it is possible to directly join resin parts made of different pressed paulownia materials. That is, unlike the conventional bonding method using melt adhesion, which is a combination of two planes, the melt (17) of one resin part (12) is connected to the other resin part (14).
By entering the recess (20) and solidifying the molten solidified material, the molten solidified material is firmly held in the recess and the two are joined. Therefore, the two can be directly joined without using any other third component.

In addition, the heat generated or applied during the welding operation melts or softens the joining surface on the side of the component that has the recess (20), thereby clenching the entrance (21) of the recess and narrowing it. When the molten material (17) that has entered the recess cools and solidifies, the molten material part comes off and σ! Due to the so-called anchor effect of 1F, the bonding strength between the two parts can be significantly increased.

The improvement in bonding strength due to such an anchor effect is not only effective for bonding resin parts made of different materials as described above, but also extremely effective for bonding resin parts made of the same type of material. When joining resin parts made of the same type of material, in addition to melt adhesion between the two at their joint surfaces, welding at the middle joint surface is used to improve the bonding strength between the two based on the anchor effect as described above. This results in a bond strength that is even superior to that of other materials. Therefore, the present invention provides PP and AB S
In addition to joining two parts made of different types of thermoplastic resins, such as a combination of resins, the present invention is also suitable for joining parts made of the same type of thermoplastic resin. It also includes.

Note that the direction of the reciprocating motion in the reciprocating friction welding in Example 111 may be any direction other than the longitudinal direction of the joint surface, and the welding operation may also be performed in addition to the reciprocating friction welding method shown in the example. If the parts are rotatable, a rotary friction welding operation may be employed, as well as other known welding operations such as ultrasonic welding, radio frequency welding, hot air welding, etc.

In addition to the circular through-hole 20 as described above, the recess to be provided in the joint surface of one of the resin parts may be a hole of various shapes or a blind hole with no holes through it.
Furthermore, longitudinal groove-like recesses of a predetermined length are provided intermittently,
It is also possible to provide continuous grooves in the longitudinal direction of the joint surface. The shape, size, number, etc. of the recesses are appropriately determined depending on the desired anchor effect, in other words, the degree of bonding strength between the two parts.

Furthermore, although we have described the case where the recess is provided only on the -10- surface of one of the resin parts to be joined on the upper side, it is also possible to provide the recess in either of the joining directions of both resin parts. . When recesses are provided in both curved surface surfaces, it is desirable that the recesses in one joining direction be provided at different positions from the recesses in the other joining direction.

In addition, the present invention may be subject to significant changes and modifications based on the knowledge and sincerity of the person in question without departing from the spirit of the invention, and all such embodiments are within the scope of the invention. ” is included within the scope of ``.

As detailed above, according to the present invention, by applying a welding operation in the joining direction between both resin parts 8i and the parts, the melt of one resin part enters the recess provided in the other resin part. , and the narrowing of the inlet of the recess ensures that the melt, once cooled and assimilated, is firmly held within the recess, creating a very effective anchoring effect, which As a result, we were able to achieve a number of excellent effects, such as significantly increasing the bonding strength between the two (6) fat parts.

[Brief explanation of the drawing]

No. 11-1 is a perspective view showing an example of a bonded product obtained according to the method of the present invention, FIGS. 2 and 3 are perspective views showing two resin parts constituting the bonded product, and FIG.
) to (d) are cross-sectional explanatory views of a joint portion (flange portion) each showing a joining process according to the method of the present invention. 12.14: Semi-cylindrical part I'IA (1M fat part) 16.
18: Flange part 17: Melt 20: Circular hole (recess)
21: Entrance section applicant Kojima Press Kogyo Co., Ltd.

Claims (4)

[Claims] (1) When joining two resin □ parts with '11' M, at least one resin part should be joined 1m.
By applying a welding operation to the entire recess, the bath melt generated by melting and contacting the joint surface of the other resin BIS product is allowed to enter the recess, while at the same time A method for joining resin parts characterized by narrowing the opening of the recess by melting or softening the resin so that the molten material of one of the parts is retained within the recess. . (2) The two resin parts are made with different resin grips (111), and the resin grips forming the one tree part that connects to the excretion G1 of the four places in the Ait mark are connected to the other tree part. j
1 Resin constituting the old female product) l:, lN1 than A 岑・1
) The method described in item 1 of the range of crotch precision that has a high score. (3) Vessels with rq'rJ welding operation or friction welding layer ii
'F visit scope The method described in item 1 or 2. (4) The recess is a circular hole n1 of patent #1
ij. The method according to item 1 or 2.