JPH08197961A - Mounting bracket and manufacturing method thereof - Google Patents

Abstract

(57) [Abstract] [Purpose] A mounting bracket in which the mounting portion protruding from the outer peripheral surface of the collar is largely offset from the cylindrical collar without applying bending force to the mounting portion. Make it manufacturable. [Structure] Aluminum or aluminum alloy is extruded to form a long member 3 comprising a cylindrical portion 10 and a protruding portion 20 protruding from the outer peripheral surface of the cylindrical portion 10, and the long member 3 is cut along a cutting line. After cutting the bracket material 3 ′ from the long material 3 at the intersection of the cutting lines so that the tubular portions 10 and the protruding portions 20 intersect so that 4 and 5 intersect in the middle, the bracket material 3 ′ The protruding portion 20 'is forged to finish the mounting portion 2 into the final shape.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to a mounting bracket used for mounting a vehicle engine on a vehicle body and a method for manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, an engine mounted on a vehicle is often mounted using an aluminum mounting bracket, and this mounting bracket has been proposed in, for example, Japanese Unexamined Patent Publication No. 5-180256.

In the mounting bracket of the above-mentioned publication, a cantilever type mounting portion extending laterally from the collar portion is integrally molded with the extruded cushion material filling collar portion during the extrusion molding, and the mounting portion is attached. The reinforcing ribs are formed by forging on the continuous portion of the collar portion and the collar portion, and the whole is made of aluminum or an aluminum alloy.

Further, in the case of a mounting bracket in which the mounting portion is offset in the axial direction with respect to the collar portion, if a long member formed by extrusion molding is cut in a direction perpendicular to the long axis of the long member, The collar is put into a cup-shaped movable female die, the end of the other mounting part is restrained, and the punch is pressed into the cylinder hole of the collar while squeezing the inner wall to press in the female die. And the bending force is supported on the mounting portion by its reaction to form a shape in which the mounting portion is offset from the collar portion.

On the other hand, as a method of manufacturing a mounting bracket in which the mounting portion is largely offset with respect to the collar portion, a long member is cut long by the offset of the mounting portion,
A method of manufacturing a mounting bracket by forging the mounting portion and then cutting off an excessive collar portion has also been proposed.

[0006]

However, as in the former publication, the female die having the end portion of the mounting portion constrained and the collar portion embedded therein is moved in the press-fitting direction of the punch to attach the mounting portion to the collar portion. With the offset type, molding is possible in the case of a mounting bracket with a small amount of offset at the mounting portion, but with a mounting bracket with a large amount of offset, the bending force acting on the mounting portion causes cracks at the base of the mounting portion. When the meat is brought close to the tip of the attachment portion or the tip of the reinforcing rib, the meat does not sufficiently rotate, and the meat is shrinked at the tip, which makes manufacturing difficult.

In the latter method, in which the long member is cut by the offset amount of the mounting portion, and the excess portion of the collar portion is cut off after the mounting portion is molded, the material is wasted and the yield is poor. there were.

The present invention has been made in order to solve such a problem, and even if the mounting portion is largely offset with respect to the collar portion, it is possible to process the mounting bracket without applying bending force to the mounting portion. And a method for manufacturing the same.

[0009]

In order to achieve the above-mentioned object, a mounting bracket according to the present invention is an extruded product of aluminum or an aluminum alloy, and has a cylindrical portion and an outer peripheral surface of the cylindrical portion. A long bar made of protruding parts is cut from two directions of the cylindrical part and the protruding part so that the cutting lines intersect in the middle to form a bracket material, and the bracket material is forged to form a tubular collar. And a cantilevered mounting portion which is provided on the outer peripheral surface of the collar portion and is offset from the end surface of the collar portion in the axial direction by a large amount.

In order to achieve the above object, in the method for manufacturing a mounting bracket according to the present invention, aluminum or an aluminum alloy is extruded to form a cylindrical tubular portion and an outer peripheral surface of the tubular portion. A long member is formed by the protruding portion provided, and this long member is cut from the two directions of the cylindrical portion and the protruding portion so that the cutting line intersects at the middle, and the bracket is attached to the long member at the intersection of the cutting lines. After cutting off the material, this bracket material is forged to finish the cantilevered mounting part that is projected on the outer peripheral surface of the tubular collar part and is offset axially largely from the end face of the collar part to the final shape. It is characterized by doing so.

It is preferable that the tubular portion is cut from a direction perpendicular to the axis and the protrusion is cut from a direction inclined at an angle with the axis.

Further, it is preferable that a cutter reaching the intersection has a time difference so that the cutter cutting the bracket material from two directions does not interfere with the intersection of the cutting lines.

It is preferable that the cutting step of cutting the tubular portion from a direction perpendicular to the axis and the cutting step of cutting the protruding portion from a direction inclined by a certain angle with respect to the axis are offset from each other.

[0014]

In the present invention, since the mounting portion is formed in advance with the collar portion being offset, the final shape can be finished without applying bending force to the mounting portion. As a result, it is possible to solve problems such as cracks occurring at the base of the mounting portion and insufficient movement of the meat during forging of the mounting portion, resulting in lack of thickness.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail with reference to the drawings. 1 is a plan view of a mounting bracket manufactured by the method of the present invention, FIG. 2 is a side view of the same, FIG. 3 is an explanatory view showing a cutting step of a manufacturing method according to an embodiment of the present invention, and FIG. FIG. 5 is a plan view of the bracket material cut from the long material in the cutting step of the manufacturing method according to one embodiment of the present invention. FIG. 5 is a plan view of the bracket material cut from the long material in the cutting step of the manufacturing method according to the one embodiment of the present invention. It is a side view.

The mounting bracket according to the present invention comprises:
It is composed of a cylindrical collar portion 1 and a cantilever type mounting portion 2 protruding from the outer peripheral surface of the collar portion 1, and the mounting portion 2 is largely offset in the axial direction from the end surface of the collar portion 1.

The mounting portion 2 has a two-step shape having a step 2f between the thick portion 2a and the thin portion 2b.
A mounting hole 2c is vertically formed in the thick portion 2a so as to be located on an extension line of one end face of the collar portion 1, and the thin portion 2
In b, a mounting hole 2d is provided at a position slightly closer to one end side of the collar 1 than on an extension line passing through the widthwise center of the collar 1.
The mounting hole 2d and the mounting hole 2c have a shape in which a mounting hole 2e is vertically formed at a position substantially equidistant from the mounting hole 2c, and is entirely molded of aluminum or aluminum alloy.

In manufacturing the mounting bracket having the above structure, first, aluminum or an aluminum alloy is extruded to form a hollow cylindrical tubular portion 1.
The long member 3 is formed of 0 and the projecting portion 20 that is provided so as to project from the outer peripheral surface of the tubular portion 10 and that has the step 20f on the tip side.

Then, as shown in FIG. 3, the long piece 3 is
One is from a direction perpendicular to the axis of the tubular portion 10 and the other is a direction in which the protrusion 20 has an angle close to the final shape of the mounting portion 2.
Cut from the direction.

In cutting, the long member 3 is first fixed horizontally, and then the cylindrical portion 10 is cut from a direction perpendicular to the axis by a cutter (not shown) such as a band saw.

At the same time, a cutter (not shown) inclined by an angle Θ with respect to the step 20f parallel to the axis of the tubular portion 10 starts cutting from the tip end side of the protruding portion 20 toward the tubular portion 10 side. Then, at the intersection of cutting line 4 and cutting line 5,
The bracket material 3'is cut off from the long material 3, so that both cutters do not interfere at the intersection 6 of the cutting lines 4 and 5,
When the cutting line 4 by one cutter reaches the intersection 6, the cutter is retracted, and then the other cutter is advanced to the intersection 6 to cut off the bracket material 3 ', or conversely, the cutting line 5 by the other cutter intersects. The method of retracting the cutter reaching 6 and then advancing one cutter to the intersection 6 and cutting off the bracket material 3'is adopted.

The bracket material 3'cut as described above has a solid line shape shown in FIGS.
The tubular portion 10 'of the bracket material 3'becomes the collar portion 1, and the mounting portion 2 is formed by cold forging the protruding portion 20' of the bracket material 3'and is formed into a mounting bracket shown by an imaginary line. The molding method will be described below.

In cold forging the protruding portion 20 'of the bracket blank 3', first, the tubular portion 10 '(collar portion 1) of the bracket blank 3'is appropriately placed on a bed of a forging press (not shown). Is fixed, and in this state, the protruding portion 20 '
Is pressed to simultaneously cold forge the thick wall portion 2a and the thin wall portion 2b. At this time, the protruding portion 20 'is formed into the mounting portion 2 (final shape) shown by phantom lines in FIGS. 4 and 5. .

The bracket material 3'which has been subjected to the cold forging process as described above is sent to the next punching step, and the mounting portions 2a and 2b of the mounting portion 2 are mounted in the mounting holes 2c and 2c.
The mounting bracket is completed by punching d and 2e.

Further, the mounting bracket manufactured by the above method is not one in which the mounting portion 2 is offset by applying a bending force, although the mounting portion 2 is largely offset with respect to the collar portion 1. Therefore, problems such as cracking at the base of the mounting portion 2 and insufficient movement of the meat to cause lack of thickness at the tip of the mounting portion 2 during the manufacturing process do not occur.

Further, the elongated member 3 is cut from one direction perpendicular to the axis of the cylindrical portion 10 and from two directions in which the protrusion 20 forms an angle close to the final shape of the mounting portion 2. However, as shown by a thick line in FIG. 3, a cutting step (a) for cutting the tubular portion 10 from a direction perpendicular to the axis and a cutting step (b) for cutting the protrusion 20 from a direction inclined by a certain angle Θ with the axis. And may be shifted. In this case, a cutting line 4'is inserted in the tubular portion 10 in the cutting step B as shown in FIG.
By inserting the cutting line 5 into the, it is possible to accurately cut off the bracket material 3'from the long material.

[0027]

As described above, the mounting bracket of the invention according to claim 1 is an extrusion-molded product of aluminum or aluminum alloy, and is provided on the cylindrical portion and the outer peripheral surface of the cylindrical portion so as to project. A long material made of protruding parts is cut from two directions of a cylindrical part and a protruding part so that cutting lines intersect in the middle to form a bracket material, and this bracket material is processed to form a cylindrical collar part. By forming a cantilever type mounting portion projecting on the outer peripheral surface of the collar portion and being largely offset in the axial direction from the end surface of the collar portion, cracks may occur at the root of the mounting portion, or the mounting portion It will be a high quality and strong mounting bracket with no flesh at the tip.

According to a second aspect of the present invention, there is provided a method of manufacturing a mounting bracket, which comprises extruding aluminum or an aluminum alloy by extrusion to form a cylindrical tubular portion and a projecting portion projecting from an outer peripheral surface of the tubular portion. After the long material is formed, and the long material is cut from the two directions of the tubular portion and the protruding portion so that the cutting lines intersect in the middle, and the bracket material is cut off from the long material at the intersection of the cutting lines. By forging this bracket material, the cantilever type mounting part that is projected on the outer peripheral surface of the cylindrical collar part and is largely offset in the axial direction from the end face of the collar part is finished to the final shape. Since the mounting portion is formed with the collar portion offset in advance, the final shape can be finished without applying bending force to the mounting portion.
As a result, a crack may occur at the base of the mounting part,
It is possible to solve the problem that the movement of the meat is insufficient when the mounting portion is forged, and the meat is lacking.

Further, since it is not necessary to perform processing such as deforming the mounting portion to near the elongation limit of the conventional material, a product of stable quality can be obtained, and a long material can be preliminarily prepared in consideration of the offset portion of the mounting portion. After cutting and molding the mounting part,
As compared with the case where the collar portion is cut by the offset amount and finished into the final shape, the material is not wasted, so that the retention of the material is improved, and as a result, it can be provided at a low cost.

A method of manufacturing a mounting bracket according to a third aspect of the present invention is the method of manufacturing a mounting bracket according to the second aspect, wherein the tubular portion is in a direction perpendicular to an axis and the protruding portion. Is cut from a direction inclined at a certain angle with respect to the axis, the yield of the material is increased, and the cost can be reduced.

A method of manufacturing a mounting bracket according to a fourth aspect of the present invention is the method of manufacturing a mounting bracket according to the second aspect, wherein the bracket material is 2
Since the cutter that cuts from the direction does not interfere at the intersection of the cutting lines, by giving a time difference to the cutter reaching the intersection, it is possible to accurately cut off the bracket material from the long material, and It is possible to easily cut from the direction in which the axis is inclined at a certain angle. This provides better material retention and, as a result, can also be provided cheaply.

A method for manufacturing a mounting bracket according to a fourth aspect of the present invention is the method for manufacturing a mounting bracket according to the second aspect, further comprising a cutting step of cutting the tubular portion from a direction perpendicular to an axis. By cutting the projecting portion and the cutting step of cutting it from the direction inclining at an angle with the axis, the cutting line of the tubular portion is cut in the cutting step of cutting the tubular portion from the direction perpendicular to the axis. Then, by inserting a cutting line into the protrusion in a cutting step of cutting the protrusion from the direction in which the protrusion is inclined at an angle to the axis, it is possible to accurately cut off the bracket material from the long material. In addition, it is possible to easily cut the protruding portion from a direction in which the protruding portion is inclined at an angle with the axis. This provides better material retention and, as a result, can also be provided cheaply.

[Brief description of drawings]

FIG. 1 is a plan view of a mounting bracket manufactured by a manufacturing method according to an embodiment of the present invention.

FIG. 2 is a side view of a mounting bracket manufactured by a manufacturing method according to an embodiment of the present invention.

FIG. 3 is an explanatory diagram showing a cutting step of the manufacturing method according to the embodiment of the present invention.

FIG. 4 is a plan view of a bracket material cut from a long material in a cutting step of a manufacturing method according to an embodiment of the present invention.

FIG. 5 is a side view of a bracket material cut from a long material in a cutting step of a manufacturing method according to an embodiment of the present invention.

[Explanation of symbols]

 1 Collar part 2 Mounting part 3 Long material 3'Bracket material 4,5 Cutting line 6 Intersection

Claims (5)

[Claims] 1. A tubular member, which is an extruded product of aluminum or an aluminum alloy, and having a tubular portion and a protruding portion protruding from the outer peripheral surface of the tubular portion, is formed into a tubular shape such that cutting lines intersect each other in the middle. The bracket material is formed by cutting from two directions of the protruding portion and the protruding portion, and the bracket material is forged to project from the cylindrical collar portion and the outer peripheral surface of the collar portion and from the end surface of the collar portion in the axial direction. A mounting bracket characterized in that a cantilevered mounting portion that is largely offset is formed on the. 2. An aluminum or aluminum alloy is extruded to form a long member having a tubular portion and a protrusion protruding from the outer peripheral surface of the tubular portion. Cut from the two directions of the tubular part and the protruding part so that they intersect in the middle, cut off the bracket material from the long material at the intersection of the cutting lines, and then process this bracket material to make the tubular collar part A method for manufacturing a mounting bracket, characterized in that a cantilever type mounting portion which is provided on the outer peripheral surface and is offset from the end surface of the collar portion in the axial direction is finished to a final shape. 3. The mount according to claim 2, wherein the tubular portion is cut from a direction perpendicular to the axis and the protrusion is cut from a direction inclined at an angle with the axis. Bracket manufacturing method. 4. The manufacturing of a mounting bracket according to claim 2, wherein the cutters that cut the bracket material from two directions do not interfere with each other at the intersections of the cutting lines, and the cutters that reach the intersections have a time difference. Method. 5. The cutting step of cutting the tubular portion from a direction perpendicular to the axis and the cutting step of cutting the protruding portion from a direction inclined at an angle with the axis are offset from each other. The method for manufacturing the mounting bracket according to claim 2.