JPH08169028A - Insert member for insert molding - Google Patents

Abstract

PURPOSE: To make a joint face conform to a face of a resin molding without any specific contrivance for a mold and without using any specific parts. CONSTITUTION: An insert member is inserted into a resin molding for forming by insert molding a head part of a bolt having a face to be a joint face 1C at the time of jointing to other member. When a resin material is injected from a side part, the joint face 1C of the insert member comes to be pressed to a mold face by flow pressure of the resin material so as to form a shape of a side peripheral face 1B.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insert molding insert member such as a bolt head, a nut member or a collar which is inserted into a resin molded product and has a surface serving as a fastening surface when fastened to another member.

[0002]

2. Description of the Related Art As an insert member of this type, for example, there is a nut member embedded in a resin bracket of a vibration isolator such as an engine mount. In such a vibration isolator, an elastic body is provided between the inner cylinder and the outer cylinder, and the outer cylinder and the mounting portion are integrally molded with a resin material to form a resin bracket. A nut member is embedded in the mounting part of this bracket to reduce weight, prevent rust, and reduce the number of processing steps. As a mold device for integrally molding the outer cylinder part and the mounting part with a resin material and inserting the nut member into the resin molded product (bracket), as shown in FIG. 14, a mold device is provided between the upper mold 100 and the lower mold 101. The cavity 102 is formed, and the lower mold 101 is formed.
Has a pin 104 for positioning the nut member 103.
15, the nut member 103 is positioned in the cavity 102 so as to be embedded in the resin, and the resin material is injected from the side of the nut member 103 in the arrow direction to mold the resin material, as shown in FIG. In addition, the nut member 103 is embedded in the resin. When the nut member 103 is inserted by the method shown in FIG. 14, the fastening surface A of the nut member 103 may enter inside the surface of the resin molded product 105 due to the dimensional tolerance of the nut member 103, the resin flow pressure, and the like. (See FIG. 15). As shown in FIG. 15, the nut member 10 is more than the surface of the resin molded product 105.
When the fastening surface A of 3 enters inside by a depth a, when the mating member 106 is fastened using the nut member 103 with a screw (not shown), a gap is created between the fastening member A and the nut member 103 by the depth a. Even after once tightened, the creeping force of the resin molded product 105 and the mating member 106 decreases with time and the tightening force decreases, causing loosening of the tightening. Further, if the fastening force is increased, the resin portion that is in strong contact with the counterpart member 106 may be sagged.

In order to eliminate such inconvenience, it has been attempted to make the height dimension of the nut member 103 and the interval of the cavity 102 the same, but the dimensions of the nut member 103 and the mold are precisely designed. Without it, the purpose could not be achieved, which was difficult in reality. Moreover, if it is attempted to realize it, the cost will be significantly increased.

Therefore, as shown in FIG. 16, a device has also been developed in which the fastening surface A is designed to project outside the resin molded product 105.

Further, as shown in FIG. 17, a cavity 102 is formed between an upper die 100 and a lower die 101, and the lower die 10
1 is an insertion hole 1 into which the screw portion 201 of the bolt 200 is inserted.
No. 07 is formed, the head 202 is positioned in the cavity 102 so as to be embedded in the resin, and the resin material is injected from the side of the head 202 of the bolt 200 in the arrow direction to mold the resin material. The head 202 of the bolt 200 is embedded in the resin. A protrusion 108 is formed in the insertion hole 107 so that the screw portion 201 does not float up from the insertion hole 103.
A groove 203 into which 8 is fitted is formed.

[0006]

In the conventional example shown in FIG. 16, the tolerance of the height dimension of the nut member 103 is possible at a normal level, that is, no higher precision is required, but the resin material is prevented from wrapping around. Therefore, the outer diameter tolerance and the outer shape tolerance of the nut member 103 become strict, and the unit price of the nut member 103 becomes expensive. Further, the mating member to be fastened is in contact only with the fastening surface of the nut member, so that the tightening force at the time of fastening and the burden on the mating member at the time of a load are increased, which also causes damage. In addition to this method, there is a method of processing the mold structure in a complicated manner or using other parts, but it has the drawback of increasing the cost of the mold device as a whole and making maintenance difficult. there were. Further, in the case of the conventional example shown in FIG. 17, it is necessary to process the lower mold 101 to form the insertion hole 107 and the protrusion 108, which makes the mold expensive, and periodic maintenance is required in the mass production process. Will also be required. Further, the dimensions of the member to be inserted are required to have strict tolerances, so that the member to be inserted needs to be precisely manufactured, which is expensive.

Therefore, in the present invention, an insert is devised so that the fastening surface of the insert member and the surface of the resin molded product are the same, without specially devising the die or using special parts. An object is to provide a molding insert member.

[0008]

In order to achieve the above object, the present invention provides insert molding of a head of a bolt or the like which is inserted into a resin molded product and has a surface serving as a fastening surface when fastened to another member. Insert member for use, in which the shape of the side peripheral surface is formed so that when the resin material is injected from the side, the fastening surface of the insert member is pressed against the mold surface by the fluid pressure of the resin material, etc. Is.

[0009]

According to the present invention, the surface of the mold defining the cavity in the mold is not processed at all, the shape of the member to be inserted is devised, and the fastening surface of the insert member is molded by the fluid pressure of the resin material. Since it is pressed against the mold surface, the fastening surface after molding is flush with the surface of the resin molded product.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings.

In the first embodiment shown in FIG. 1, the nut member 1
Shows a case of inserting into a resin molded product described later, a cavity 4 is formed between the upper mold 2 and the lower mold 3, and the upper mold 2 is fitted into the screw hole 1A of the nut member 1 for positioning. 5 is provided. In order that the fastening surface 1C of the nut member 1, that is, the insert member is pressed against the surface of the lower mold 3, the shape of the side peripheral surface 1B is formed in a tapered portion whose diameter increases from the top toward the fastening surface 1C. When the nut member 1 having the shape shown in FIG. 2 is positioned in the cavity 4 by the pin 5, when the resin material is injected from the side, it flows as shown by the arrow in FIG. Due to the shape of the side peripheral surface 1B, the nut member 1 is fastened to the fastening surface 1 by the flow pressure of the resin material or the like.
C can be pressed against the surface of the lower mold 3.

In the second embodiment shown in FIG. 3, the nut member 1
Has a collar portion 1D formed on the top side thereof, and the side peripheral surface 1B extending from the collar portion 1D to the fastening surface 1C has a tapered portion similar to that shown in FIG. Also in this nut member 1, when the resin material is injected from the side, the fastening surface 1C of the nut member 1 is pressed against the surface of the lower mold 3 due to the fluid pressure of the resin material.

In the third embodiment shown in FIG. 4, the tapered portion is formed from the top of the side peripheral portion 1B to the middle of the fastening surface 1C, and the fastening surface 1C side is formed in the cylindrical portion 1E having the same diameter. There is. Also in this embodiment, the flow of the resin material acts so as to press the nut member 1 toward the fastening surface 1C side.

The fourth embodiment shown in FIG. 5 shows a hexagonal nut member 1 as shown in FIG.
Is formed in a taper part where the diameter gradually increases,
On the other hand, it is formed in a taper portion where the diameter gradually decreases from the middle. In this embodiment, the pin 5 is provided on the lower mold 3. Further, the gate 6 is provided at a position where the flow of the resin material further presses the nut member 1 toward the fastening surface 1C side.

In the fifth embodiment shown in FIG. 7, the head 7A of the bolt 7 is inserted as an insert member, and the shape of the side peripheral surface 7B of the head of the bolt 7 is the bolt 7.
The fastening surface 7C is a taper portion so as to be pressed against the surface of the lower mold 3. The gate 6 is also provided at a position where the flow of the resin material acts on the bolt 7 in the direction of pressing the fastening surface 7C. The lower die 3 is formed with an insertion hole 3A into which the screw portion 7B is inserted.

In a sixth embodiment shown in FIG. 8, a serration 7E is formed adjacent to the head 7A of the bolt 7, and the serration 7E is inserted into the resin molded product to insert the bolt 7 therein. Rotation is prevented.

In the seventh embodiment shown in FIG. 9, the nut member 1
The side peripheral surface 1B is formed by three stages of cylindrical body portions 1E having different diameters,
The diameter of the cylindrical body 1E on the fastening surface 1C side is formed to be the largest. In addition, in this embodiment, a protrusion 8 located laterally to the source side of the nut member 1 is formed, and the presence of the protrusion 8 changes the flow of the resin material. As a result, the fluid pressure of the resin material is changed. And the like further act by pressing the nut member 1 against the nut member 1 toward the fastening surface 1C side.

In the eighth embodiment shown in FIG. 10, a projection 8 is provided on the lower mold 3, and the projection 8 allows the fastening surface 7C of the bolt 7 to be pressed downward. Not only the presence of the protruding portion 8 but also the shape of the side peripheral surface 7B of the head portion 7A of the bolt 7 is formed in the tapered portion, so that the bolt 7 is further pressed to the fastening surface 7C side.

FIG. 11 shows a ninth embodiment of the nut member 1.
A protrusion 8 similar to that shown in FIG. 9 is formed adjacent to, and a gap b above the protrusion 8 in the drawing is formed to be larger than a gap c below the protrusion 8, whereby the flow of the resin material is increased by the nut member 1. Will be pressed to the fastening surface 1C side.

As the insert member, in addition to the nut member 1 and the head portion 7A of the bolt 7, a collar (not shown) or the like can be inserted. When inserting the collar, insert the bolt into the collar, sandwich the mating member between the head of the bolt and the fastening surface of the collar, and fasten a nut smaller than the outer diameter of the collar to the tip of the bolt protruding from the collar to the outside. . This small nut contacts the resin molding.

FIG. 12 shows an example in which the head 1A of the bolt 7 thus inserted is applied to the bracket 11 (resin molded product) of the vibration isolator. The rubber 12 is integrally bonded to the outer cylinder portion 11A of the bracket 11, and the inner cylinder 13 is integrally bonded to the rubber 12. The head 7A of the metal bolt 7 is inserted into the mounting portion 11B of the bracket 11. Depending on the position of the gate 6 when the bracket 11 is molded, the resin material flows in the direction of the arrow in the figure, and the head 7A is pushed downward. In order to press the head portion 7A of the bolt 7 at the right end in the drawing downward, it is effective to provide the protrusion 8 on the mold at a position adjacent to the head portion 7A on the source flow side of the flow of the resin material. 13 is a plan view of what is shown in FIG. 12, and the mounting portion 11 of the bracket 11 is shown.
Heads 7A of bolts 7 are inserted at three points of B. Here, the resin bracket 11 is a resin molded product.

[0022]

As described above, according to the present invention, when the resin material is injected from the side, the fastening surface of the insert member is pressed against the mold surface by the flow pressure of the resin material. Since the shape of the side peripheral surface is formed on the
There is no need to process the mold or use a special member, and by setting this insert member at a predetermined position in the cavity, the fastening surface of the insert member will be pressed against the mold surface, As a result, the surface of the resin molded product and the fastening surface are flush with each other. Further, it is not necessary to precisely manufacture the insert member.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment.

FIG. 2 is a perspective view of a nut member used in FIG.

FIG. 3 is a sectional view showing a second embodiment.

FIG. 4 is a sectional view showing a third embodiment.

FIG. 5 is a sectional view showing a fourth embodiment.

FIG. 6 is a bottom view of the nut member used in FIG.

FIG. 7 is a sectional view showing a fifth embodiment.

FIG. 8 is a sectional view showing a sixth embodiment.

FIG. 9 is a sectional view showing a seventh embodiment.

FIG. 10 is a sectional view showing an eighth embodiment.

FIG. 11 is a sectional view showing a ninth embodiment.

FIG. 12 is a front view showing an example applied to a vibration isolation device.

13 is a plan view of FIG.

FIG. 14 is a sectional view showing a conventional example.

FIG. 15 is a cross-sectional view showing a molded product of a conventional example.

FIG. 16 is a sectional view showing another conventional example.

FIG. 17 is a sectional view showing still another conventional example.

[Explanation of symbols]

 1 Nut member (insert member) 1A Screw hole 1C Fastening surface 1B Side peripheral surface 7 Bolt (insert member) 7A Head 7B Side peripheral surface 7C Fastening surface

Claims (3)

[Claims] 1. An insert-molding insert member, such as a head of a bolt, which is inserted into a resin molded product and has a surface that serves as a fastening surface when fastened to another member, and in which a resin material is injected from the side. The insert molding insert member is characterized in that the shape of the side peripheral surface is formed so that the fastening surface of the insert member is pressed against the mold surface by the flow pressure of the resin material or the like. 2. The insert member for insert molding according to claim 1, wherein the shape of the side peripheral surface is formed to have a tapered portion whose diameter increases from the top toward the fastening surface. 3. The shape of the side peripheral surface is formed in two or more stages of tubular portions having different diameters, and the tubular portion on the fastening surface side is formed with a large diameter. Insert member for insert molding.