JPH02190223A - Manufacture of radiator - Google Patents

Abstract

PURPOSE:To prevent buckling deformation of a tube or a fin by icing about the half of a thickness of a core portion of a plate-like radiator and subjecting same to bending by a press at the time of manufacturing a curved radiator for a motor cycle. CONSTITUTION:All structure parts of a radiator 1 are made of aluminium, and a tube 3 has a flat rectangular section. A fin 5 is corrugated. Two rows of tubes 3 and the fins 5 are arranged alternately and joined to each other, and a steel plate 7 is joined to the fins 5 positioned at both ends to form a core portion 9. A radiator tank 13 is connected to the outside of a core plate 11. The plate-like radiator 1 is then placed in a form into which water is poured. The quantity of water 23 to be poured is set within 1/3-1/1 of the thickness of the core portion 9, and the water 23 is freezed in a low temperature room. With one side of the fin portion iced, the radiator 1 is taken out and subjected to bending between press molds 31, 33.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a method of manufacturing a radiator for engine cooling, and more particularly to a method of manufacturing a curved radiator for a two-wheeled vehicle.

``Prior Art'' A radiator for a two-wheeled vehicle has a planar shape that includes a core portion in which tubes 3 and corrugated fins 5 are alternately arranged and joined, as shown in FIGS. 1 to 4. Although it has been common practice, in vehicles with strong sports orientation, it has become desirable for design or functional reasons to curve it as shown in FIG. 8 to match the external shape of the adjacent engine, etc.

"Problem to be Solved by the Invention" However, when a radiator with a planar shape as shown in FIGS. 1 to 4 is bent by press,
As shown in FIG. 10, which is a view from the arrow, the tube 3 is buckled and deformed due to the compressive force inside the bent portion, and the fin 5
There was a problem in that the corrugated shape of the paper would collapse. In addition, in a radiator having multiple rows of tubes 3 as shown in FIG. 11, the air passages 5a of the fins 5 are bent, resulting in increased ventilation resistance, and the tube mounting portion of the core plate 11 has a step 11b due to excessive stress. occurs or the radiator tank 1 is damaged due to the deformation of the core plate 11.
3 also had the problem of deformation. Note that the fin 5. Core plate 11. A desirable shape of the radiator tank 13 is shown.

The present invention has been made in view of the above problems, and
The purpose is to provide a method for manufacturing a curved radiator that can prevent buckling deformation of the tube, prevent deformation of the core plate and the radiator tank without destroying the corrugated shape of the fins.

"Means for Solving the Problems" In order to solve the above problems, the present invention manufactures a curved radiator including a core portion in which one or more rows of tubes and corrugated fins are alternately arranged and joined. In the method, a substantially flat radiator is placed in a mold, and a liquid substance that is easily solidified and melted is applied to the fin portion to a thickness of 1/3 to 1/1 of the thickness of the core portion. After introducing the liquid substance into the formwork and solidifying it on the fin part, the radiator is taken out from the formwork and bent by a press so that the solidified substance in the fin part is on the side where compressive force is applied. The present invention provides a method for manufacturing a radiator, comprising the steps of: performing the bending process, and melting and removing a substance solidified on the fin portion after the bending process.

"Operation" According to the above method, by solidifying the substance introduced into the fin part, 1/3 to 1/1 of the thickness of the core part is filled with the substance and shaped into a block. Then,
During bending, the tube and block-shaped fin portions are alternately arranged and joined on the side of the core portion on which compressive force is applied.

Therefore, the side of the core portion on which the tensile force acts mainly stretches and deforms. The solidified material suppresses deformation on the side of the fin section on which compressive force is applied, allowing it to be bent without destroying the corrugated shape. In addition, on the side of the tube where the compressive force acts, the adjacent fins are block-shaped, so
It can be bent with buckling deformation toward the fin side suppressed.

"Example" Embodiments of the present invention will be described with reference to the drawings.

First, Figures 1 to 4 show a flat radiator before bending. Figure 1 is a front view, Figure 2 is a plan view, and Figures 3 and 4 are partial sectional views. .

All the components of this radiator 1 are made of aluminum. The tube 3 has a flat rectangular cross section as shown in FIG. The fins 5 are formed in a corrugated shape as shown in FIG. Two rows of tubes 3 and fins 5 are alternately arranged and joined, and side plates 7 are joined to the fins 5 located at both ends to form a core part 9.

Both ends of the tube 3 in the longitudinal direction are inserted into holes 11a formed in the core plate 11 and then joined together, and a radiator tank 13 is joined to the outside of the core plate 11.

Next, FIGS. 5 and 6 show a state in which the flat radiator 1 as described above is placed in the formwork.
FIG. 6 is a plan view.

This formwork 21 has bottom parts 21a, 21 as shown in FIG.
b is provided with a step so that only the core portion 9 of the radiator 1 is in contact with the bottom portion 21a, so that the core plate 11 and the radiator tank 13 have some clearance with respect to the bottom portion 21b.

Next, water 23, which is a substance that solidifies and melts easily, is poured into the mold 21. At this time, the radiator tank 13.
Water 2 does not need to be introduced into the tube 3.
The amount of 3 may be in the range of 1/3 to 1/1 of the thickness t of the core portion 9, but it should not expand during solidification and exceed the thickness t, and in FIG. The state is shown in which 1/2 of the dimension t has been injected. In this state, the water 23 is solidified in a cold room.

With the water 23 solidified and one side of the fin portion frozen, the radiator 1 is taken out of the mold and bent by a press.

FIG. 7 shows bending by a press. In this press die, the lower die 31 is concave and the upper die 33 is convex. During bending, the radiator 1, which is the workpiece, is marked with an arrow on the lower die 31 side. In this embodiment, one side of the fin 5 is stretched to 1/2 of the thickness t of the core portion 9, in which a tensile force as shown by C acts, and a compressive force as shown by an arrow B acts on the upper die 33 side. Although the frozen part is frozen, the frozen part is bent toward the upper die 33 side where compressive force is applied.The pressing force of the press at this time varies depending on the thickness dimension t of the core part 9, but - for example as t=24
In the case of m-, during the zero bending process of 1.5 tons or more, the upper mold 33 side of the core part 9 is frozen, so the fin shape does not collapse, and the lower mold 31 side is mainly stretched and deformed due to the tensile force. A curved shape as shown in FIG. 8 is obtained.

FIG. 9 shows a cross section of the fin 5 at the curved part of the radiator 1 that has been bent in this way. The tube has a substantially straight shape, and each air passage 5a is formed in a substantially normal direction to the bent tube 3.

After the bending process is completed, the radiator 1 is placed in a water tank (not shown), the ice is melted and removed, and the finished product is obtained.

In the embodiments described above, the radiator has two rows of tubes arranged between adjacent fins, but it may also have one row or three or more rows of tubes. In the case of one row, it is particularly effective when the radiator is made of aluminum and the thickness of the core portion exceeds 16w+m.

In addition to water, as the substance that is easily solidified and melted, a substance that can undergo a reversible phase change between solid and liquid due to a change in temperature, such as wax or paraffin, may be used.

"Effects of the Invention" Since the present invention is configured as described above, it has the following effects.

During bending using a press, the side of the fin portion on which compressive force is applied is prevented from deforming by the solidified material, and can be bent without destroying the corrugated shape. Further, since the adjacent fin portions on the side of the tube on which the compressive force is applied are block-shaped, the tube is bent in a state where buckling deformation toward the fin side is suppressed. In this way, there is an effect that a curved radiator with a good bending shape can be stably obtained.

FIG. 10 is a plan view showing a curved radiator made by a conventional manufacturing method, and FIG. 11 is a sectional view showing a curved radiator made by a conventional manufacturing method.

101. Radiator, 319. tube, 59
．． .

Fin, 911, Core part, 21, Formwork, 2
3゜0. Substances that solidify and melt easily (water, ice), 3
1゜1. Lower mold, 33, upper mold 6

[Brief explanation of the drawing]

1 is a front view showing a flat radiator, FIG. 2 is a plan view showing the radiator, FIG. 3 is a partial sectional view showing the radiator tank of the radiator, and FIG. 4 is a view of the core of the radiator. 5 is a sectional view showing the radiator placed in a formwork, FIG. 6 is a plan view thereof, FIG. 7 is a front view showing bending by press, and FIG. Fig. 8 is a front view showing a curved radiator, Fig. 9 is a sectional view showing a curved radiator, Fig. 3 Fig. 2 Fig. A Fig. Fig. Fig. Fig. 10121 Fig. 11

Claims (1)

[Claims] A method for manufacturing a curved radiator comprising a core portion in which one or more rows of tubes and corrugated fins are alternately arranged and joined, the method comprising: manufacturing a substantially flat radiator in a formwork; A substance that is easily solidified and melted is introduced into the fin part in a liquid state to a thickness of 1/3 to 1/1 of the thickness of the core part, and the liquid substance is placed in the formwork to form the fin part. After the radiator is solidified into parts, the radiator is taken out from the mold and bent by a press so that the solidified material in the fin part is on the side where the compressive force acts, and after the bending process, the solidified material in the fin part is A method for manufacturing a radiator, comprising the step of melting and removing.