JP2696783B2 - Method of processing and assembling parts and centering jig used for the method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for processing and assembling parts and a centering jig used for the method.

[0002]

2. Description of the Related Art In order to make a motorcycle pivot plate assembly, two cross pipes are joined to a pair of left and right pivot plates made of an aluminum material formed by casting and assembled by welding. Usually, a pilot plate with a pre-drilled hole or a pilot plate with a cast hole formed at the time of casting is set together with a cross pipe in a welding jig and welded, and then the shaft hole is processed.

However, when such an assembling method is adopted,
Accumulation of errors due to variations in the forming accuracy and machining accuracy of the pivot plate, or differences in how to set the cross pipe welding standards and subsequent machining standards, causes eccentricity in the swing arm mounting holes, There is a disadvantage that a black scale remains on a portion having a small cutting amount due to a partial amount, and a good product cannot be produced.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of such a problem.
It is an object of the present invention to provide a method of assembling a new component that does not cause accumulation of errors and a new centering jig used in the method.

[0005]

That is, the present invention provides a method of processing and assembling parts to achieve the above-mentioned objects, and a jig for processing and positioning a pair of first parts formed through a forming step. The jig is used as a reference to machine at least a mounting position of the second part on the first part, and then the pair of first parts are fixed to each other with reference to a centering jig for welding positioning. Second for one part
The parts are assembled and welded to each other, and the centering jig used in this method is inserted into each shaft hole of the pair of first parts to center the first part. And an inner width defining collar which is inserted through and held by the centering pin, and which comes into contact with each inner surface of the first component to define the interval between the first components.

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 2 shows an assembling process of a pivot plate assembly according to an embodiment of the present invention, and FIG. 1 is a view showing a centering jig used in this assembling method.

First, the assembling process of the pivot plate assembly will be described with reference to FIG. 2. A pair of left and right pivot plates W made of aluminum material formed in the casting process I are then separated from each other. And then fixed to a jig (not shown). The two cross pipe mounting blind holes a and b formed in the casting process and the swing arm mounting shaft hole c are connected to the other portions. It is precisely cut by a processing machine along with the processing.

The pair of pivot plates W, W formed as described above are then conveyed to the welding joint section III, where they are temporarily fixed to the swing arm mounting shaft hole c, and will be described later. 1 and the cross pipe mounting blind holes a and b
Are inserted through the respective cross pipes P1, P2, and these are integrally welded to the left and right pivot plates W, W.

FIG. 1 shows a centering jig 1 used in this welding and joining step. The centering pin 2 for centering the left and right pivot plates W, W is shown in FIG.
Is formed to be slightly longer than the interval between the two pivot plates W, W, is inserted through the swing arm mounting shaft holes c, c, and has a knob 3 provided at one end and a clamp screw 4 screwed to the other end. With the left and right pivot plates W, W
Are temporarily fixed.

On the other hand, two pivot plates W, W
The collars 5 and 6 for defining the inner width, which define the distance between them, are made of a member having a female screw portion and a male screw portion at one end, and the screw length is matched to the specification by screwing these screw portions. After being adjusted to the dimensions, the inner ends of the bosses d of the swing arm mounting shaft holes c are brought into contact with both ends thereof, and are inserted through the centering pins 2 in order to define the widths of the two pivot plates W, W. I have.

In the drawing, reference numeral 7 denotes a nut for preventing loosening, and reference numeral 8 denotes a space between the centering pin 2, the inner width defining collars 5, 6 and the left and right pivot plates W, W. 3 shows an interposed thrust bearing.

Next, the processing and assembling method described above will be described. A pair of pivot plates W, W formed through a casting process are fixed to jigs (not shown), respectively, and the jig is used as a processing reference. The inner surfaces of the cast-out two cross pipe mounting blind holes a and b and the swing arm mounting shaft hole c are accurately cut together with other portions.

The pivot plates W, W formed in this manner are then sent to a welding joint section, where they are correctly centered by the centering pins 2 inserted into the swing arm mounting shaft holes c, and are further centered. A predetermined interval is determined by the inner width defining collars 5 and 6 inserted through the extension pin 2, and fixed by the clamp screw 4. Then, these pivot plates W, W are held with reference to the centering jig 1, and cross pipes P1, P2 are attached to the cross pipe attachment blind holes a, b, and finally, the pivot plates W, W Are welded together with these to be integrated.

Therefore, in the pivot plate assembly completed in this way, each pivot plate unit W, W is first processed based on the processing standard, and then fixed based on the welding standard to form the cross pipes P1, P2. Therefore, no black scale remains on the surface of the pivot plate, and the pivot plate assembly can be assembled and completed with correct specification accuracy without accumulating errors.

Although the present invention has been described with reference to the example of processing and assembling the pivot plate assembly of a motorcycle, the present invention is applied to a product having another shaft hole for processing by welding a plurality of welding parts. The present invention can also be applied to this.

[0016]

As described above, according to the present invention, a pair of first parts formed through a forming step are processed with reference to a jig, and then these are formed using a centering jig for positioning. Since the second component is assembled to the first component and welded together, these components can be processed and assembled with precision according to the specified dimensions without accumulating errors generated in each process. .

In addition, as a jig used for welding connection, a pair of components are centered by a centering pin, and the interval between these components is defined as specified by a collar for defining an inner width. A series of operations for assembling and welding the first and second parts while temporarily fixing the jig can be performed as specified.

[Brief description of the drawings]

FIG. 1 is a side view of a centering jig according to an embodiment of the present invention.

FIG. 2 is a view showing a processing and assembling process of a part according to an embodiment of the present invention.

FIGS. 3A and 3B are perspective views showing a state before assembling parts and a state after assembling.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Centering jig 2 Centering pin 5, 6 Collar for defining inner width W Pivot plate P Cross pipe a Swing arm mounting shaft hole

Claims (2)

(57) [Claims] 1. A pair of first parts molded through a molding step are respectively fixed by a processing positioning jig, and at least a mounting position of at least a second part on the first part is processed based on the jig. Then, the pair of first parts are temporarily fixed to each other based on a centering jig for welding positioning, and
A method of processing and assembling a part, comprising attaching a second part to the part and welding the two parts together. 2. A first component which is inserted into each shaft hole of a pair of first components and
A centering jig comprising: a centering pin for centering a component; and an inner width defining collar inserted through and held by the centering pin and abutting on each inner surface of the first component to define an interval between the first components. Utensils.