TW201424882A - Manufacturing method of composite metal tube and structure thereof - Google Patents

Abstract

The present invention provides a manufacturing method of composite metal tube and structure thereof, which comprises: to prepare a drawing mold, wherein the drawing mold is disposed with a drawing hole extending along the axial direction and penetrating through the drawing mold, of which one end in the axial direction is the material-feeding port and the other end is the material-discharging port; to sleeve the first metal tube onto the outer side of the second metal tube in the way of loose fitting and coaxial relationship; drag the first metal tube and the second metal tube together to pass through the drawing hole of the drawing mold in the direction from the material-feeding port to the material-discharging port, making the first metal tube squeezed to wrap the outer surface of the second metal tube tightly in the process of passing through the drawing mold. By selecting the first metal tube with corrosion resistance and the weather resistance while having better ductility to wrap the outer surface of the second metal tube, a composite metal tube capable of reducing the cost and having corrosion resistance and the weather resistance is obtained.

Description

Manufacturing method and structure of composite metal pipe

The present invention relates to a method of manufacturing a metal pipe and a structure thereof, and more particularly to a method of manufacturing a composite metal pipe in which a first metal pipe is tightly coated on the outer surface of a second metal pipe and a structure thereof.

Many common equipment or utensils are made directly from metal tubes or from metal tubes, such as metal scaffolding, architectural scaffolding, merchandise display stands, flagpoles, and bus stop poles. Generally speaking, depending on the application and environment, metal pipes of different materials are used. Commonly included: iron pipes, aluminum pipes and copper pipes. Due to the declining earth resources and the decreasing supply of international raw materials, The cost of many metals continues to increase, resulting in rising costs and prices for metal tubes. Finding alternative materials to reduce the dependence and demand on metal tubes is one way to reduce costs, but for some applications or utensils, it is still not possible to replace metal tubes with other alternative materials.

On the other hand, many equipments or utensils made of metal tubes or metal tubes need to solve the problem that the metal tubes are easily corroded and rusted. The methods for preventing metal corrosion or corrosion include: plating treatment. Such as iron pipe galvanizing treatment, coating protection such as coating paint or anti-rust oil, anode anti-rust treatment and cathode anti-rust treatment, the effect of these methods or techniques is different, the applicable materials are also different, some methods The processing cost is high, and the process of implementing some methods is even prone to environmental pollution problems.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method and a structure for manufacturing a composite metal pipe which can reduce cost and has corrosion resistance and weather resistance.

An embodiment of the present invention comprises: preparing a drawing die, wherein the drawing die is provided with a drawing hole extending in the axial direction and extending through the drawing die, and one end of the axial direction of the drawing hole is a feeding material The other end is a discharge port; the first metal pipe is sleeved on the outer side of the second metal pipe in a loose fit and a coaxial relationship; and the first metal pipe and the second metal pipe are in the direction from the feed port to the discharge port The metal tube is pulled together through the drawing hole of the drawing die, so that the first metal pipe is pressed and tightly wrapped on the outer surface of the second metal pipe during the process of drawing the die.

An embodiment of the method of the present invention further includes the step of forming a reinforcing groove on the outer side surface of the composite metal tube.

An embodiment of the method of the present invention further comprises the step of forming a spiral pattern on the outer surface of the composite metal tube.

An embodiment of the composite metal pipe of the present invention comprises: a second metal pipe, and a first metal pipe tightly wrapped on the outer surface of the second metal pipe in a coaxial relationship, by selecting corrosion resistance and resistance The first metal tube having the ability and the better ductility is coated on the outer surface of the second metal tube to form a composite metal tube which can reduce the cost and has corrosion resistance and weather resistance.

In an embodiment of the composite metal pipe of the present invention, the ductility of the first metal pipe is superior to the ductility of the second metal pipe.

The details of other functions and embodiments of the present invention will be described below in conjunction with the drawings.

The method of the present invention coats a first metal tube 10 on the outer surface of a second metal tube 20 by metal drawing (see "Fig. 3"), thereby forming a composite metal tube C, in the method of the present invention. An embodiment of the method includes the following steps: A drawing die 30 is prepared. The drawing die 30 is provided with a drawing hole 31 extending in the axial direction and extending through the drawing die 30. The axial end of the drawing hole 31 is an inlet port 32, and the other end is a discharge port 33; the first metal pipe 10 is sleeved on the outer side of the second metal pipe 20 in a loose fit and a coaxial relationship; and the first metal pipe 10 is oriented from the feed port 32 to the discharge port 33 The second metal pipe 20 is pulled together through the drawing hole 31 of the drawing die 30, so that the first metal pipe 10 is pressed and tightly coated on the outer surface of the second metal pipe 20 in the process of passing through the drawing die 30.

Referring to "Fig. 1" and "Fig. 2", the inner diameter D1 of the inlet 32 of the drawing hole 31 is larger than the inner diameter d1 of the discharge port 33, the drawing hole 31 is pulled out and the discharging port 32 is directed toward the discharge. The direction of the port 33 is tapered to a tapered shape, and the cross-sectional shape of the drawing hole 31 on the side close to the inlet 32 has a lead angle 34 for guiding the first metal pipe 10 and the second metal pipe 20. Entering the inlet port 32, the initial outer diameter D2 of the first metal pipe 10 is slightly larger than the inner diameter d1 of the discharge port 33, when the first metal pipe 10 and the second metal pipe 20 are together from the inlet port 32 to the discharge port 33. The direction is pulled by a jig 40 through the drawing hole 31 of the drawing die 30 (see "Fig. 3"), and the first metal pipe 10 is pressed and tightly wrapped in the second process by the drawing die 30. The outer surface of the metal tube 20.

The method of the present invention coats the first metal tube 10 on the outer surface of the second metal tube 20 through a metal drawing process. Therefore, the ductility of the first metal tube 10 selected therein should be superior to the extension of the second metal tube 20. And at the same time, by coating the outer surface of the second metal pipe 20 with the corrosion resistance and the weather resistance and the better ductility, the first metal pipe 10 is coated on the outer surface of the second metal pipe 20, thereby forming a cost reduction, corrosion resistance and weather resistance. In order to achieve the above object and effect, in an embodiment of the present invention, the first metal tube 10 is an aluminum tube, and the second metal tube 20 is an iron tube; In another embodiment of the present invention, the first metal tube 10 is an aluminum tube and the second metal tube 20 is a copper tube; since the oxidation of the aluminum tube is very slow, the oxidized aluminum generates a dense oxidation on the surface. The aluminum film protects the inner aluminum from the oxygen and is protected. Therefore, the present invention selects an aluminum tube as the first metal tube 10, and covers the first metal tube 10 on the outer surface of the second metal tube 20 to achieve protection. The second metal pipe 20 has the ability of corrosion resistance and weather resistance. On the other hand, since the price of aluminum is relatively cheap and has good ductility, it is suitable for the metal drawing method and can achieve the purpose of reducing the cost.

Another embodiment of the method of the present invention further includes the step of forming a reinforcing groove 50 on the outer surface of the composite metal pipe C. One embodiment of the method is shown in "Fig. 4" and "Fig. 5". The inner side wall of the drawing hole 31 of the drawing die 30 forms a protruding portion 35, and the first metal pipe 10 and the second metal pipe 20 are pulled together by the jig 40 in the direction from the inlet 32 to the discharge port 33. When the drawing hole 31 of the mold 30 is pulled into the composite metal pipe C, a reinforcing groove 50 can be formed on the outer surface of the composite metal pipe C by the protruding portion 35 (see "Fig. 6"), and the protrusion is changed by The position and number of the portions 35 and the shape of the cross-section thereof enable the production of a composite metal pipe C having different numbers and shapes of reinforcing grooves 50; the composite metal pipe C having the reinforcing structure 50 has better structural strength. It is commonly used in combinations such as display stands or other devices or utensils for carrying heavy objects.

Another embodiment of the method of the present invention further includes the step of forming a spiral pattern on the outer surface of the composite metal tube C. One embodiment of the method is shown in "Fig. 7" and "Fig. 8". The inner side wall of the drawing hole 31 of the drawing die 30 forms a protruding portion 35, and the first metal pipe 10 and the second metal pipe 20 are pulled together through the drawing hole 31 of the drawing die 30 while rotating the drawing die 30, One of the embodiments is to install the drawing die 30 on a bearing 60 and A gear 70 is disposed on the outer side of the drawing die 30, and the gear 70 can be fixedly mounted on the outer side of the drawing die 30 by using a key 71 or the like, and then the driving gear 70 and the drawing die 30 are rotated by other driving means. When a metal pipe 10 and a second metal pipe 20 are pulled together by the jig 40 in the direction of the discharge port 33 by the jig 40 through the drawing hole 31 of the drawing die 30 to become the composite metal pipe C, it is possible to borrow A spiral pattern is formed on the outer surface of the composite metal pipe C by the protruding portion 35, and the ornamental property of the composite metal pipe C is increased by the spiral pattern; and by changing the number of the protruding portions 35 and the shape of the cross section thereof, And by controlling the rotational speed of the drawing die 30, a composite metal pipe C having a different grain can be manufactured.

While the present invention has been described above by way of example, the present invention is not intended to limit the invention, and the invention may be modified and modified without departing from the spirit and scope of the invention. The scope of patent protection is subject to the terms of the claims attached to this specification.

10‧‧‧First metal tube

20‧‧‧Second metal tube

30‧‧‧Drawing mould

31‧‧‧ Pull holes

32‧‧‧Inlet

33‧‧‧Outlet

34‧‧‧ lead angle

35‧‧‧Protruding

40‧‧‧Clamp

50‧‧‧ Strengthening the ditch

60‧‧‧ bearing

70‧‧‧ Gears

71‧‧‧ keys

C‧‧‧Composite metal tube

D1‧‧‧Inlet diameter of the inlet

D1‧‧‧Drawing port inner diameter

D2‧‧‧The initial outer diameter of the first metal tube

Fig. 1 is a structural view showing an embodiment of a drawing die provided by the method of the present invention.

Fig. 2 is a sectional structural view of Fig. 1.

Figure 3 is a schematic view of a process of the method of the present invention showing the first metal tube and the second metal tube passing through the drawing holes of the drawing die.

Fig. 4 is a structural view showing another embodiment of the drawing die provided by the method of the present invention.

Fig. 5 is a sectional structural view of Fig. 4.

Fig. 6 is a structural sectional view showing an embodiment of a composite metal pipe of the present invention.

Figure 7 is a configuration diagram of another embodiment of a drawing die provided by the method of the present invention.

Figure 8 is a schematic view of a process of the method of the present invention showing the first metal tube and the second metal tube passing through the drawing holes of the drawing die in rotation.

10‧‧‧First metal tube

20‧‧‧Second metal tube

30‧‧‧Drawing mould

31‧‧‧ Pull holes

32‧‧‧Inlet

33‧‧‧Outlet

34‧‧‧ lead angle

D1‧‧‧Inlet diameter of the inlet

D1‧‧‧Drawing port inner diameter

D2‧‧‧The initial outer diameter of the first metal tube

Claims (10)

A manufacturing method of a composite metal pipe, comprising: preparing a drawing die, wherein the drawing die is provided with a drawing hole extending in an axial direction and penetrating the drawing die, wherein an axial end of the drawing hole is The other end of the inlet port is a discharge port, the inner diameter of the inlet port is larger than the inner diameter of the discharge port, and the drawing hole is tapered to be tapered by the inlet port toward the discharge port; The first metal tube is sleeved on the outer side of the second metal tube in a loose fit and a coaxial relationship; and the first metal tube and the second metal tube are pulled together by the inlet to the discharge port The composite metal pipe is formed by tightly coating the first metal pipe on the outer surface of the second metal pipe by the drawing hole of the drawing die. The method of manufacturing a composite metal pipe according to claim 1, wherein the ductility of the first metal pipe is superior to the ductility of the second metal pipe. The method of manufacturing a composite metal pipe according to claim 2, wherein the first metal pipe is an aluminum pipe, and the second metal pipe is an iron pipe. The method of manufacturing a composite metal pipe according to claim 2, wherein the first metal pipe is an aluminum pipe, and the second metal pipe is a copper pipe. The method of manufacturing a composite metal pipe according to claim 1, further comprising forming a protrusion on an inner side wall of the drawing hole of the drawing die. The method of manufacturing a composite metal pipe according to claim 1, further comprising forming a protrusion on an inner side wall of the drawing hole of the drawing die, and the first metal pipe and the second metal The tube is pulled together through the drawing hole of the drawing die while rotating the drawing die. A composite metal pipe manufactured by the method of claim 1, comprising: a second metal pipe; and a first metal pipe tightly wrapped on the outer surface of the second metal pipe in a coaxial relationship. The composite metal pipe according to claim 7, wherein the ductility of the first metal pipe is superior to the ductility of the second metal pipe. The composite metal pipe according to claim 8, wherein the first metal pipe is an aluminum pipe, and the second metal pipe is an iron pipe. The composite metal pipe according to claim 8, wherein the first metal pipe is an aluminum pipe, and the second metal pipe is a copper pipe.