JPH0357293Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a mounting device for a corrugated fin forming roll for forming a continuous thin plate material into a wave shape, and particularly relates to a mounting device for a corrugated fin forming roll that forms a continuous thin plate material into a wave shape. This invention relates to a mounting device for a corrugated fin forming roll that eliminates eccentricity.

[Conventional technology]

Heat dissipation fins used in automobile heat exchangers such as radiators generally have a wavy shape with a certain pitch P, a certain width d, and a certain height h, as shown in Fig. 4 (for example, in real life). (Refer to Kaisho 60-157023). Such a fin is called a corrugated fin, and as shown in FIG. It is formed by passing a thin sheet 3 of aluminum or other metal between rolls 1 and 2.

In addition, the shape accuracy of the forming rolls 1 and 2 greatly affects the forming accuracy of the corrugated fin to be formed.
Among them, aluminum fins have low elasticity, so if the height h of the fins 4 has unevenness as shown in FIG. If the fins are inserted between the fins and compressed from the height direction, the wavy shape of the fins tends to buckle or fall, and there is a high probability that defects will occur during the assembly process. One of the causes of unevenness in the fin height is that the forming roll 1,
2 and its support shaft, the eccentricity is increased. This is because even if the external shapes of the forming rolls 1 and 2 are processed with high precision, eccentricity will occur if they are improperly installed.

FIG. 8 shows an example of a conventional forming roll mounting system. In the same figure, a forming roll 1 (the same is true for forming roll 2, so only one of them is shown) is attached to a cylindrical holder 6 with a flanges.
By fitting the presser plate 7 to the outer periphery of the forming roll 1, the presser plate 7 and the holder 6
They are held together in a sandwich-like manner by the flange 6a, and are tightened and integrated with bolts (not shown).

The holder 6 of the forming roll 1 integrated in this way
is fitted onto the straight shaft 8 and fixed with a key 9 so as to prevent relative rotation. 10 is a drive gear keyed to the shaft 8.

[Problem that the invention attempts to solve]

In the conventional forming roll installation method as mentioned above,
There is a gap of 10 to 20 μm between the outer diameter of the shaft 8 and the hole diameter of the holder 6 that fits into it. However, this gap causes the roll to be eccentric to the shaft during fin forming,
As a result, the fin height h becomes uneven as shown in FIG.

Also, in order to reduce the amount of eccentricity of the roll, it is possible to set the fitting allowance to 10 μm or less, but in this case, the roll cannot be easily fitted to the shaft, and the roll setting time increases. Therefore, there was a problem that the operating rate of the fin molding machine was reduced.

[Purpose of invention]

This invention was developed to solve the above problems, and it not only makes it easier to attach and detach the forming roll to the support shaft, but also eliminates the eccentricity of the forming roll with respect to the support shaft, reducing irregularities in the height of the fins. An object of the present invention is to provide a mounting device for a corrugated fin forming roll.

[Means for solving problems]

The corrugated fin forming roll mounting device according to the present invention includes a tapered shaft portion provided on the roll support shaft, and a collet whose outer circumference is cylindrical and whose inner circumference is a tapered surface that matches the tapered shaft portion in the axial direction. The forming roll is movably fitted to the roll support shaft, and the forming roll is fixed to the roll support shaft via the collet.

[Effect of invention]

In the present invention, since the collet is pushed between the outer periphery of the tapered shaft and the inner periphery of the cylindrical hole of the forming roll, the fitting allowance of the forming roll to the tapered shaft is absorbed by the collet and becomes zero. Therefore, eccentricity of the forming roll due to the fitting allowance is eliminated.

[Example of idea]

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

FIG. 1 shows a cross-sectional view of the entire forming roll mounting device according to the present invention, in which 1 indicates a forming roll, 10
is a drive gear; 11 and 12 are donut disk-shaped side plates; the side plates 11 and 12 are stacked on both sides of the forming roll 1 in a sandwich shape with their axes aligned; They are superimposed on each other. In such a polymer, a plurality of positioning pins 13 are driven in a direction parallel to the axis, and a plurality of tightening bolts 14 are inserted from the side plate 11 side in the direction of the drive gear 10. The forming roll 1 including the side plates 11 and 12 is screwed into the formed screw hole 10a and tightened.
and a drive gear 10 are integrated, and a roll support shaft 1 is provided at the center of this integrated forming roll body 16.
The cylindrical hole 16 is slightly larger than the tapered shaft portion 15a of No. 5.
a is formed. The roll support shaft 15 is rotatably supported by the molding machine main body 17, and the forwardly protruding portion of the molding machine main body 17 is a tapered shaft portion 15a whose diameter decreases toward the tip side. A screw shaft portion 1 is attached to the tip of the tapered shaft portion 15a.
5b are integrally formed with their axes aligned. The forming roll body 16 is fitted into the tapered shaft portion 15a via a collet 18, and the forming roll body 16 is fixed by a roll tightening nut 19 screwed onto the threaded shaft portion 15a. It's becoming like that.

The outer circumference of the collet 18 is cylindrical and has an outer diameter slightly larger than the cylindrical hole 16a of the forming roll body 16, and the inner circumferential surface is tapered to match the tapered shaft portion 15a. Slit 1 extending in the longitudinal direction as shown in Figures 2 and 3
8a are formed in the circumferential direction, and a retaining ring 20 is attached to the end of the collet 18 on the threaded shaft portion 15a side so as to be relatively rotatable, and this retaining ring 20 is threadedly engaged with the screw shaft portion 15a. The collet mounting nut 21 is connected to the collet mounting nut 21. The connection means between the retaining ring 20 and the collet mounting nut 21 is constituted by a steel ball 22 that is inserted into a tap hole 21a formed in the collet mounting nut 21 and engages with a recess 20a formed on the outer periphery of the retaining ring 20. The tapped hole 21a has a screw 2 that closes it.
3 is screwed on.

When attaching the forming roll body 16 to the support shaft 15 using the attaching device configured as described above, the forming roll body 16 is first fitted onto the tapered shaft portion 15a and temporarily held. Thereafter, the collet 18 is inserted from the tapered hole side into the cylindrical hole 16a of the forming roll body 16 through the threaded shaft portion 15b, and the collet mounting nut 21 is screwed onto the threaded shaft portion 15b. When the collet mounting nut 21 is rotated with a tool such as a wrench, the collet 18 is successively pushed into the cylindrical hole 16a of the forming roll body 16 in a reduced diameter state, and its tapered inner surface is aligned with the outer periphery of the tapered shaft portion 15a. Comes into contact with the surface. At this time,
Since the boss end face 10b (see FIG. 1) of the drive gear 10 engages with the stepped portion 15c of the roll support shaft 15, movement of the forming roll body 16 in the arrow X direction (see FIG. 1) is restricted. At the same time, the roll support shaft 15 is positioned in the axial direction. In addition, when regulating the relative rotational position of the forming roll 16 and the roll support shaft 15, it is sufficient to form serration grooves that engage with each other in the boss end face 10b and the stepped part 15c of the drive gear 10.

When the collet 18 is pushed further in the direction of the arrow X from the above-mentioned fitted state and the collet mounting nut 21 is tightened until the collet 18 can hardly be moved in, the gap between the cylindrical hole 16a of the forming roll body 16 and the outer circumferential surface of the tapered shaft 15a is removed. The gap becomes zero, and the forming roll body 16 is fitted with the roll support shaft 1 with a gap.
It will be fixed at 5. That is, the fitting allowance of the forming roll body 16 with respect to the roll support shaft 15 is absorbed by the taper shaft portion 15a and the collet 18 and becomes zero, so that the eccentricity of the forming roll body 16 due to the fitting allowance as in the conventional case is eliminated. , forming roll body 16
The center axis of the roller support shaft 15 can be maintained in a state where it completely coincides with the center axis of the roll support shaft 15, and even if a load is applied in the radial direction to the forming roll body 16 during fin forming, the forming roll body 16 can be maintained due to the fitting allowance. Eccentricity never occurs.

On the other hand, after the forming roll body 16 is fixed to the roll support shaft 15 by the collet 18, the roll tightening nut 19 is screwed onto the screw shaft portion 15b, and by tightening this, the entire forming roll body 16 is fixed to the roll support shaft 15. 15 and fixed so as not to move in the axial direction.

Therefore, in the mounting device of this embodiment as described above, the forming roll body 16 is secured by the collet 18 that fits into the tapered shaft portion 15a of the roll support shaft 15.
can be fixed to the roll support shaft 15, it is possible to eliminate the eccentricity of the forming roll body 16 due to the fitting margin between the forming roll body 16 and the roll support shaft 15, and accordingly, unevenness of the fin height can be eliminated. In addition to obtaining fewer corrugated fins, defects in the conventional assembly process can be significantly reduced.

In addition, since the forming roll body 16 is fixed to the roll support shaft 15 by the collet 18, there is no need to consider the fitting margin as in the conventional case, and it is easy to attach and detach the forming roll body 16 to and from the roll support shaft 15. As a result, the operation rate of the molding machine can be improved.

Note that the mounting device of the present invention is not limited to the structure shown in the above embodiment, and may be of a structure that excludes the roll tightening nut.

[Effect of idea]

As described above, according to the present invention, the forming roll attachment part of the roll support shaft is made into a tapered shaft part, and the forming roll can be fixed to this taper shaft part by a collet that is fitted so as to be movable in the axial direction. Therefore, it is possible to eliminate eccentricity due to the fitting allowance of the forming roll, thereby reducing unevenness in the height of the corrugated fin being formed, and also making it easier to attach and detach the forming roll from the roll support shaft. be.

[Brief explanation of drawings]

Fig. 1 is an overall sectional view showing an example of a corrugated fin forming roll mounting device according to the present invention, Fig. 2 is a front view of a collet applied to the mounting device of the present invention, and Fig. 3 is a side view thereof. Figure 4 is an explanatory perspective view of a corrugate fin, Figure 5 is an explanatory perspective view of a corrugate fin forming roll, Figure 6 is an explanatory diagram of a corrugate fin when unevenness occurs in the height of the fin, and Figure 7 is an explanatory diagram of a corrugate fin. FIG. 8 is an explanatory perspective view of a combination of fins and tubes, and a sectional view of a conventional corrugate fin forming roll mounting device. 1... Forming roll, 4... Corrugated fin,
10... Drive gear, 15... Roll support shaft,
15a...Tapered shaft part, 15b...Screw shaft part, 1
6... Forming roll body, 18... Collection, 19...
... Roll tightening nut, 20 ... Retaining ring, 21
...Collection mounting nut.

Claims (1)

[Scope of utility model registration request] A tapered shaft portion is provided on the roll support shaft, and a collet having a cylindrical outer circumference and a tapered surface matching the tapered shaft portion is fitted onto the tapered shaft portion so as to be movable in the axial direction, and A mounting device for a corrugated fin forming roll, characterized in that the forming roll is fixed to the roll support shaft.