JPH08300401A - Integrated structure of metal member and resin member, and manufacture thereof - Google Patents

Abstract

PURPOSE: To prevent generation of cracks and holes in a resin member due to difference in coefficient of heat contraction between a metal member and a resin member at the time of molding and coagulating of resin. CONSTITUTION: An integrated structure 1 of a metal member and a resin member consists of an annular metal insert 2 and a resin member 3 to be formed integrally with the metal insert 2. The metal insert 2 has a cut line 4 on its periphery. The metal insert 2 having the cut line 4 on its periphery is supported by a resin forming mold, and a resin is injected and coagulated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an integrated structure of a metal member and a resin member, and a method of manufacturing the same, and is used, for example, in a fan for an automobile engine, a pulley and a method of manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, blades and bosses are made of resin,
An automobile engine fan in which an outer peripheral portion of an annular metal insert is embedded in the boss portion is integrally formed (for example, Japanese Utility Model Publication No. 3-41196). In this type of fan, conventionally, metal inserts that are continuous in the circumferential direction are placed in a molding die for the resin part, and a molten resin is injected into the mold and solidified to allow the outer periphery of the metal insert and the resin part to be solidified. And are integrally molded.

[0003]

However, since the shrinkage rate when the resin solidifies is significantly larger than the shrinkage rate of the metal insert, the difference in shrinkage rate between the resin and the metal insert during integral molding causes the resin to shrink. Cracks and formation of air bubbles (voids) in the resin part and the resulting decrease in strength occur. In order to suppress resin cracking and void formation, it is necessary to use a resin with a high elongation rate, but a resin with a high elongation rate has low strength, so
This is a major obstacle to improving product strength. An object of the present invention is to provide an integrated structure of a metal member and a resin member, which can improve product strength, and a manufacturing method thereof.

[0004]

MEANS FOR SOLVING THE PROBLEMS An integrated structure of a metal member and a resin member of the present invention which achieves the above object and a method for manufacturing the same are as follows. (1) An integrated structure of a metal member and a resin member, which comprises an annular metal insert and a resin member integrally formed with the metal insert, wherein the metal insert has a cut at one location on the circumference. An integrated structure of a metal member and a resin member, characterized in that both ends thereof are radially overlapped. (2) A method of manufacturing an integrated structure of a metal member and a resin member, which comprises an annular metal insert and a resin member integrally formed with the metal insert, and has a cut at one location on the circumference. In the state where the metal inserts are radially overlapped so that both ends thereof can slide in the circumferential direction,
The process of supporting in the metal mold for resin molding, pouring the molten resin into the metal mold, and solidifying the resin while reducing the diameter of the metal insert allowed by the slide in the overlapping part of the metal insert, and the metal insert And a step of integrally forming a resin member with the metal member and the resin member.

[0005]

In the structure of (1) above, since the metal insert has a cut at one location on the circumference and the both ends overlap, the diameter of the metal insert can be contracted by sliding both ends in the circumferential direction. Is. As a result, the metal insert can follow the large shrinkage when the resin solidifies, and cracks and bubbles do not occur in the resin portion. Further, since it is not necessary to use a resin having a high elongation rate in the resin portion, it is possible to select a resin having a relatively high strength, and the product strength is improved. In the above method (2), both ends of the metal insert having one cut on the circumference are overlapped in the radial direction so as to be relatively displaceable in the circumferential direction, and in this state, the resin is injected into the mold and solidified, Both ends of the metal insert can slide to follow the solidification and shrinkage of the resin, and it is possible to suppress the generation of cracks and bubbles in the resin part. Further, since it is not necessary to use a resin having a high elongation rate in the resin portion, it is possible to select a resin having a relatively high strength, and the product strength is improved.

[0006]

1 to 4 show a first embodiment of the present invention (engine fan without rivets), and FIGS. 5 to 8 show a second embodiment of the present invention.
9 and 10 show a third embodiment of the present invention (crank pulley without rivets), and FIGS. 11 and 12 show a fourth embodiment of the present invention (with rivets). Crank pulley) are shown respectively.
The parts of the configuration common to or similar to all the examples are:
The same reference numerals are assigned to all the examples. First, common components of all the embodiments of the present invention will be described with reference to, for example, FIGS. As shown in FIGS. 1 to 4, an integrated structure 1 of a metal member and a resin member includes an annular metal insert 2 as a metal member and a resin member 3 integrally formed with the metal insert 2. . The material of the metal insert 2 is, for example, steel. The resin of the resin member 3 may have a relatively small elongation. Metal insert 2
Has a cut 4 at one position on the circumference and is discontinuous in the circumferential direction at this cut 4. By having the cut 4, the metal insert 2 has both ends 5 and 6 in the circumferential direction. Both ends 5, 6 of the metal insert 2 are radially overlapped with each other so as to be slidable in the circumferential direction before being integrally formed with the resin member 3.

The metal insert 2 includes an axially extending portion 2a extending in the axial direction of the annular metal insert and a radial direction extending from one end of the axially extending portion 2a at a right angle so as to extend radially inward of the annular metal insert. And an extension portion 2b. Of these, the axially extending portion 2a is embedded in the resin member 3 and is integrally formed with the resin member 3. An inner peripheral portion of the radially extending portion 2b is exposed from the resin member 3, and a bolt hole 7 is provided in that portion. The coupling mounted on the inner peripheral side of the integrated structure 1 is fastened by a bolt that is inserted through the bolt hole 7, whereby the coupling and the integrated structure 1 integrally rotate around the axis. The bolt hole 7 is also used for positioning the metal insert 2 in the resin molding die during resin molding.

Next, the structure peculiar to each embodiment of the present invention will be described. In the first embodiment of the present invention, as shown in FIGS. 1 to 4, the integral structure 1 is an automobile engine fan,
The resin member 3 is composed of the fan blade portion 3b and a part of the boss portion 3a. The metal insert 2 is integrated with the resin member 3 by embedding the outer periphery in the boss portion of the resin member. The metal insert 2 has its circumferential end portions 5 and 6 overlapping each other. A projecting portion 5a projecting in the circumferential direction is formed on one of the circumferential end portions 5 and 6, and a hole 6a is formed on the other end 6. As shown in FIG. 4, the projecting portion 5 a formed on one end 5 has a hole 6 a formed on the other end 6.
And extends along the lower surface side of the end portion 6 that is opposed to the other end portion 6, and the other end portion 6 extends along the lower surface side of the end portion 5 that is oppositely rubbed. In the stage before being integrally formed with the resin member, separation from each other is suppressed in the radial direction. However, both end portions 5 and 6 are slidable in the circumferential direction with each other before being integrally formed with the resin member. The radially extending portion 2b of the metal insert 2 is provided with a positioning pin hole 8 at a position opposite to the cut 4 with respect to the metal insert axis. When the metal insert 2 is supported by the resin part molding die, the pin 9 is inserted into the pin hole 8 with the position of the pin hole 8 facing upward, and the metal insert 2 is suspended by the pin 9.

In the second embodiment of the present invention, as shown in FIGS. 5 to 8, the integral structure 1 is an automobile engine fan, and the resin member 3 is a fan blade portion 3b and a part of the boss portion 3a. Consists of. The metal insert 2 is integrated with the resin member 3 by embedding the outer periphery in the boss portion of the resin member. Both ends 5, 6 overlap the metal insert 2 in the radial direction. Both ends 5, 6 are slidable in the circumferential direction before being integrally formed with the resin member 3, but are connected by rivets 10 after integrally formed with the resin member 3 and are no longer slidable in the circumferential direction. It As shown in FIG. 8, a rivet hole 11 through which the rivet 10 is inserted is inserted into both end portions 5 and 6,
12 is formed, one rivet hole 11 is circular, but the other rivet hole 12 is an elongated hole, and even if both ends 5 and 6 slide in the circumferential direction during resin solidification, the rivet hole 12 is formed. 11 and 12 are always matched. Further, a rivet hole 13 is provided in the overlapping portion of the radially extending portion 2b of the metal insert 2, and the rivet 14 is provided therein.
Both ends 5 and 6 are further fastened by being inserted. At the time of molding the resin member 3, the resin member 3 is molded so as not to cover the rivet holes 11 and 12 of the metal insert 2, and the rivet 10 is fitted to the rivet hole 1 after molding the resin member.
Hit 1 and 12. Alternatively, after molding the resin member 3 so as to cover the rivet holes 11 and 12, the resin may be melted by the high temperature rivet 10 and the rivet 10 may be set in the rivet holes 11 and 12.

In the third embodiment of the present invention, as shown in FIGS. 9 and 10, the integral structure 1 is an automobile crank pulley. A plurality of belt grooves 3c are cut on the outer periphery of the resin member 3. The outer periphery of the metal insert 2 is the resin member 3
Embedded in the boss portion and integrated with the resin member 3.
The metal insert 2 has the same circumferential projection 5a as the metal insert of the first embodiment of the present invention on one of both ends 5, 6 and the hole 6a on the other 6. One end 5
The circumferential direction protruding portion 5a is inserted into the hole 6a of the opposite end portion 6 and extends along the lower surface side of the opposite end portion 6, and the other end portion 6 extends along the lower surface side of the opposite end portion 5, The parts 5 and 6 are engaged with each other in the radial direction, whereby the end parts 5 and 6 are restrained from being separated from each other in the radial direction in a stage before being integrally formed with the resin member. However, the both end portions 5 and 6 are slidable in the circumferential direction before being integrally formed with the resin member 3.

In the fourth embodiment of the present invention, FIGS.
As shown in, the integrated structure 1 is an automobile crank pulley. A plurality of belt grooves 3c are cut on the outer periphery of the resin member 3. The outer periphery of the metal insert 2 is embedded in the boss portion of the resin member 3 to be integrated with the resin member 3. Both ends 5, 6 overlap the metal insert 2 in the radial direction. Both ends 5, 6 are slidable in the circumferential direction before being integrally formed with the resin member 3, but are connected by rivets 10 after integrally formed with the resin member 3 and are no longer slidable in the circumferential direction. It Further, a rivet hole 13 is provided in the overlapping portion of the radially extending portion 2b of the metal insert 2, and the rivet 14 is inserted therethrough to further fasten the both end portions 5 and 6.

Next, the operation of the integrated structure 1 according to the first to fourth embodiments of the present invention will be described. The shrinkage rate due to solidification at the time of molding the resin member 3 is much larger than the shrinkage rate of the metal insert 2 when the metal insert 2 is continuous all around, and the shrinkage rate of the resin member 3 and the metal insert 2 is different. As a result, cracks and holes tend to occur in the portion of the resin member 3 that contacts the metal insert 2 and in the vicinity thereof. However, in the first to fourth embodiments of the present invention, the metal insert 2
A cut 4 is provided in the circumferential direction in the
Since both ends 5 and 6 are slidable in the circumferential direction, when the resin member is solidified, the metal insert 2 has the same or almost the same shrinkage as the shrinkage of the resin member while the both ends 5 and 6 are slid. The resin member 3 shrinks along with it. As a result, even if a resin having a relatively small elongation is used for the resin member 3, the resin member 3 is not subjected to the contraction resistance force from the metal insert 2, and cracks or voids may be generated in the resin member 3. Disappear. The unitary structure 1 is a radially extending portion 2b of the metal insert 2 and has a fan coupling (not shown).
Since it is fixedly attached to a rigid body such as, the strength and rigidity of the integrated structure 1 are sufficiently maintained even if the cut 4 is provided in the metal insert 2.

Since both ends 5 and 6 of the metal insert 2 are engaged with each other in the radial direction, the ends 5 and 6 cannot be separated from each other in the radial direction. Therefore, the metal insert 2
When the resin is supported by a metal mold or a molten resin is poured, both ends 5 and 6 of the metal insert 2 are not displaced or dangled, and the integral molding with the resin member 3 is stable. Is done.

Next, an embodiment of the method for manufacturing an integrated structure of a metal member and a resin member of the present invention will be described. FIG.
As shown in FIG. 12, the method for manufacturing the integrated structure 1 (a fan, a pulley, etc.) of the metal member and the resin member according to the embodiment of the present invention is a metal insert as a metal member having a cut 4 at one place on the circumference. The first step is to support 2 on the resin molding die in a state where both ends 5, 6 are slidable in the circumferential direction so as to be slidable in the circumferential direction, and the molten resin is injected into the die. Then, the resin is solidified while the diameter of the metal insert 2 is reduced by sliding at the overlapping portion of the metal insert 2, and the resin member 3 is integrated with the metal insert 2.
And a second step of molding. After the resin has solidified, the mold is opened and the product is taken out of the mold. The integrated structure 1 is composed of, for example, an automobile engine fan, a crank pulley, and the like.

In the first step, the metal insert 2 is suspended and positioned by the pin 9 by passing the pin 9 through the pin hole 8 and another pin 9 is provided on both sides of the pin hole 8 with bolt holes 7. The posture is stabilized by passing it through. The pin 9 passed through the bolt hole 7 is applied only to a portion of the peripheral edge of the pin hole 7 on the side close to the metal insert cut 4 so as not to prevent the diameter of the metal insert 2 from being reduced.

Next, the operation of the method for manufacturing the integrated structure 1 according to the embodiment of the present invention will be described. Since the metal insert 2 has one cut 4 on the circumference and both ends 5 and 6 are slidable in the circumferential direction, the molten resin is poured into the mold and solidified, so that the resin insert shrinks when solidified. As a result, the diameter of the metal insert 2 is also reduced, and no force acts on the resin member 3 from the metal insert 2,
It is possible to prevent the resin member 3 from cracking and a large number of holes. As a result, a resin having a relatively small elongation can be used for the resin member 3, and the product strength is increased. Further, since both end portions 5 and 6 of the metal insert 2 are engaged with each other in a radial direction so as not to be separated from each other, the both end portions 5 and 6 of the metal insert 2 are not displaced when the molten resin is poured, and the metal insert 2 is stable. Implant molding is performed on the resin.

[0017]

According to the integrated structure of the metal member and the resin member of claim 1, since the metal insert has one cut on the circumference, the heat shrinkage of the resin member is caused when the resin member is molded and solidified. Therefore, the metal insert can freely shrink, and it is possible to prevent the resin member from being cracked or vacant due to the difference in thermal shrinkage between the resin member and the metal insert.
As a result, a resin having a relatively low elongation can be used for the resin member, and the product strength is increased. According to the method for manufacturing an integrated structure of a metal member and a resin member according to claim 2, the circumference 1
Since both ends of a metal ring that has cuts at several points are supported in a radially slidable manner so that it can slide in the circumferential direction, and then resin is injected and solidified, the metal is made to shrink as the resin solidifies. It is possible to shrink the insert and prevent cracks and voids in the resin member due to the difference in heat shrinkage between the resin member and the metal insert.
As a result, a resin having a relatively low elongation can be used for the resin member, and the product strength is increased.

[Brief description of drawings]

FIG. 1 is a front view of an integrated structure of a metal member and a resin member according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a side view of the integrated structure of FIG. 1 in the vicinity of a break.

4 is a cross-sectional view taken along the line BB of FIG.

FIG. 5 is a front view of an integrated structure of a metal member and a resin member according to the second embodiment of the present invention.

6 is a sectional view taken along the line CC of FIG.

FIG. 7 is a side view of the vicinity of the break 4 of the integrated structure shown in FIG.

8 is a cross-sectional view taken along the line DD of FIG.

FIG. 9 is a front view of an integrated structure of a metal member and a resin member according to a third embodiment of the present invention.

10 is a cross-sectional view taken along the line EE of FIG.

FIG. 11 is a front view of an integrated structure of a metal member and a resin member according to a fourth embodiment of the present invention.

12 is a cross-sectional view taken along the line FF of FIG.

[Explanation of symbols]

 1 Integrated Structure 2 Metal Insert 3 Resin Member 4 Cuts 5 and 6 Both Ends 5a Projection 6a Hole 7 Bolt Hole 8 Pin Hole 9 Pin 10 Rivet 11, 12 Rivet Hole 13 Rivet Hole 14 Rivet

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location B29L 31:30

Claims (2)

[Claims] 1. An integrated structure of a metal member and a resin member comprising an annular metal insert and a resin member integrally formed with the metal insert, wherein the metal insert is provided at one location on the circumference. An integrated structure of a metal member and a resin member, which has a break and both ends thereof are overlapped in a radial direction. 2. A method of manufacturing an integrated structure of a metal member and a resin member, which comprises an annular metal insert and a resin member integrally formed with the metal insert, wherein a cut is made at one location on the circumference. The metal insert having the step of supporting the metal insert in the resin molding die in a state where the both ends are slidably overlapped with each other in the circumferential direction in the radial direction, and injecting the molten resin into the die, A step of solidifying the resin with the diameter reduction of the metal insert allowed by sliding at the overlapping part to mold the resin member integrally with the metal insert, and an integrated structure of the metal member and the resin member. Production method.