KR100588978B1 - Continuous pipe forming method - Google Patents

Abstract

The present invention relates to a method for forming a pipe having a rectangular cross section and having a relatively high strength in the circumferential direction compared to the strength in the circumferential direction. Attach a plurality of extrusion bar attachment plates having a shape corresponding to the shape of the pipe to be formed at regular intervals, assemble the plurality of extrusion bars around the extrusion bar attachment plate, and then roll the steel band around the plurality of extrusion bars to form the mold. Forming; Sequentially injecting a first cylindrical fabric, a cylindrical fabric and a second cylindrical fabric to form an inner layer of the pipe, an insulating structural material, and a first cylindrical fabric, a cylindrical fabric and a second cylindrical fabric to form an outer layer of the pipe; And curing the laminate composed of the inner layer, the insulating structural material, and the outer layer.

Pipe, Forming Method, Cylindrical Fabric, Circular Fabric, Continuous

Description

Forming method for pipe

1 is a front view showing a process of forming a mold before forming a pipe according to the present invention.

Figure 2a is a side view showing a state in which the primary mold assembly, that is, only the extrusion bar attachment plate assembled on the main shaft.

2B is a side view illustrating a state in which the extrusion bar is attached to the second mold assembly state, that is, the extrusion bar attachment plate.

Figure 3 is a plan view showing a process of forming a pipe in accordance with the present invention.

4 is a cross-sectional view of a pipe formed in accordance with the present invention.

5 is a front view showing a conventional pipe forming method.

<Code Description of Main Parts of Drawing>

10: machine house 20: cam plate

30: spindle 40: extruded bar attachment plate

44: extrusion bar 60: columnar fabric input device

62: columnar fabric 70: circular fabric input device

72: circular fabric 80: insulation structure input device

82: heat insulating structural material 90: hardened heater

The present invention relates to a continuous pipe forming method, and more particularly to a continuous pipe forming method capable of producing a large rectangular continuous pipe using a composite of glass fiber and carbon fiber.

5 illustrates a conventional pipe forming method. As shown in the drawing, the conventional pipe forming method winds a steel band 4 having a predetermined width in a spiral direction on one supported main shaft 3 that is rotated by the motor 1 to form a cylindrical mold, and the mold is formed thereon. After the material 5 was wound up, the pipes were continuously formed by carrying out the curing, releasing and cutting processes sequentially. At this time, as the molding material 5, glass roving, glass wool, various kinds of fabrics and those filled with particles such as silica sand (sand) are used as fillers.

However, this conventional pipe forming method is limited to the production of a pipe having a circular cross-sectional shape, and has the disadvantage that the strength in the axial direction of the produced pipe is relatively low compared to the strength in the circumferential direction.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems of the prior art, and provides a method of forming a pipe having a rectangular cross section and having a relatively large axial strength compared to a circumferential strength.                         

Other objects, specific advantages and novel features of the present invention will become more apparent from the following detailed description and the preferred embodiments associated with the accompanying drawings.

The object of the present invention is to install a cam plate on one side of the machine house is equipped with a drive means and a plurality of extruded bar attachment plate having a shape corresponding to the shape of the pipe to be formed at regular intervals after the main shaft is laid down Attaching and assembling the plurality of extruded bars around the extruded bar attachment plate and then winding a steel band around the plurality of extruded bar attachment plates to form a mold corresponding to the shape of the pipe to be molded; Sequentially injecting a first cylindrical fabric, a cylindrical fabric and a second cylindrical fabric to form an inner layer of the pipe, an insulating structural material, and a first cylindrical fabric, a cylindrical fabric and a second cylindrical fabric to form an outer layer of the pipe; It is achieved by a continuous pipe forming method comprising the step of curing the laminate composed of the inner layer, the insulating structural material and the outer layer.

At this time, the ratio of the circumferential fabric and the circumferential fabric to be injected is preferably in the range of 1: 3 to 1: 5.

In addition, it is preferable that the circumferential fabric and the coaxial fabric are prepregs obtained by coating and semi-curing a composite of glass fibers and carbon fibers.

And the heat insulating structural material is preferably a foam structure or honeycomb structure made of polyurethane.

Therefore, according to the present invention, the pipe having excellent strength in the axial direction and having a rectangular cross-sectional shape can be continuously manufactured, and the manufactured pipe can be effectively used as a structure of a railway vehicle.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail.

1 is a front view illustrating a mold fabrication process, FIG. 2A is a side view illustrating a primary mold assembly state, that is, a state in which only an extrusion bar attachment plate is assembled to a main shaft, and FIG. 2B is a secondary mold assembly state, that is, an extrusion bar attachment. Side view showing the state where the extrusion bar is attached to the plate.

First, a process of manufacturing a mold for molding a pipe will be described with reference to FIGS. 1 and 2A and 2B.

To form the mold, first, the machine house 10 is fixed to the floor and the cam plate 20 is assembled to one side of the machine house 10. The machine house 10 is equipped with a motor 11, the driving force of the motor 11 is transmitted to the chain gear 12 through the chain and finally to the main shaft 30 built on the chain gear 12. When assembling the cam plate 20 for the first time, the position must be changed according to the position where the steel band is wound. In addition, the shape and dimensions of the cam plate 20 is changed according to the width of the steel band used in the production of care should be noted.

When the assembly of the cam plate 20 is completed, the main shaft 30 is assembled to the machine house 10. When assembling the center of gravity of the main shaft 30 will be directed to the front, so be careful not to fall.

Up to this stage, it is a one-time operation after the installation of the facility, and the subsequent works must be assembled and disassembled according to the shape of the product.

Thereafter, a plurality of extruded bar attachment plates 40 having a shape corresponding to the shape of the pipe to be formed on the block portion 32 welded to the spindle 30 are assembled, which is based on the length of the spindle 30. The quantity and dimensions of 40 are different. When the assembly of the extrusion bar attachment plate 40 is completed, the shape of the primary mold is obtained.

Then, the plurality of extrusion bars 44 are inserted into the grooves 42 formed around the extrusion bar attachment plate 40, and then fixed with the brackets 46 and the bolts 48 to have a shape of the secondary mold. In other words, it has the shape of the pipe to be finally produced. At this time, if there is a slight change in the shape of the product by inserting the block into the extrusion bar attachment plate 40 can change the dimensions of the secondary mold up to about 30mm.

Then, the steel band is wound around the extrusion bar 44. At this time, care should be taken to give the steel band tension.

After the steel band has been wound to the end of the extrusion bar 44, the position of the steel band recovery device 50 is determined so that the steel band can pass into the auxiliary shaft 35 provided at one end of the main shaft 30.

After passing the steel band, check the length and cut it to weld the first part and the end part together. Rotating the spindle 30 after welding, the steel band is advanced by the steel band pusher 55 coupled to the cam plate 20, and again to recover the process through the steel band recovery device 50 This will take the form of the final mold.

At this time, the product should not be produced until the first part of the steel band is recovered and repeated. This is to give sufficient tension to the steel band by the steel band tensioning device 57. A phenomenon occurs that results in no further advancement.

Next, a process of molding the pipe using the mold manufactured as described above will be described with reference to FIG. 3.

The process of forming the pipe rotates the main shaft 30 to allow the steel band 52 to be advanced, and then inputs raw materials (that is, circular fabric, columnar fabric, and thermal insulation material), and at this time, the circular fabric input device 70. Should be controlled to rotate the same as the rotation of the main shaft (30). This is so that the position of the coaxial fabric 72 does not change so that the coaxial reinforcement position of the product does not change. And the rotational speed of the main shaft is to control the production speed and the speed of other processes.

First, the fabric to form the inner layer of the pipe is introduced, the first circumferential fabric 62 constituting the inner layer fabric is wound on the outer surface of the mold by the circumferential fabric input device (60). The circumferential fabric injecting device 60 is composed of two devices, an unwinding device 64 for releasing the circumferential fabric 62 and a device 66 for impregnating resin in the circumferential fabric 62. The release device 64 is attached with a tension device (not shown) for adjusting the tension when the circumferential fabric 62 is introduced. The circumferential fabric 62 introduced from the release device 64 is wound on the spindle 30 in the form of a wet prepreg by passing through the impregnation tank 67 and the roller 68 in the impregnation tank 67 to impregnate the resin. .

Next, the cylindrical fabric 72 is wound in a 90 [deg.] Direction with respect to the direction in which the circumferential fabric 62 is wound, but is introduced in a dry prepreg form different from the circumferential fabric 72. Here, the reason why the circumferential fabric 62 and the circumferential fabric 72 are wound 90 degrees to each other is to increase the strength of the pipe.

Then, the second columnar fabric 62 is again introduced into the 90 ° direction with respect to the direction in which the circumferential fabric 72 is wound, thereby completing the introduction of the fabric to form the inner layer of the pipe.

In the present invention, the feeding of the circular fabric 72 is used for the purpose of increasing the strength in the axial direction of the rectangular continuous pipe, and rotates in the same axial direction of the square pipe while rotating in the same manner as the main shaft rotational speed of the continuous molding apparatus. Feed the woven fabric. The circumferential fabric and the woven fabric to be introduced are prepregs coated with resin and semi-cured in a composite of glass fiber and carbon fiber, and the ratio is 1: 3 to 1: 5.

Insulating structure member 82 is continuously injected, the insulating structure member 82 is made of polyurethane foam or honeycomb structure and the thickness is about 40mm. The insulating structural member 82 is cut into a predetermined length, and serves to hold the cut portion by bonding a glass fiber fabric to the bottom thereof. Insulation of the insulating structural member 82 is, in principle, unlike the circumferential and circular woven fabric is not forced by the rotational force of the main shaft 30 is forced to be in accordance with the rotational speed of the main shaft 30.

As described above, after the fabric to form the inner layer and the insulating structural material are added, the fabric to form the outer layer is added in the same manner as the fabric to form the inner layer.

When the fabric to form the outer layer is injected, the cross-section of the pipe to be formed becomes a sandwich structure, wherein the hardening of the pipe begins when approaching the curing heater 90 that emits radiant heat.

After passing through the curing heater 90 completely cut the pipe to the desired length.

4 is a sectional view of a pipe manufactured by the above manufacturing method. As shown, the pipe has a rectangular cross-section with rounded corners, that is, a spherical shape for a railway vehicle. The cross section is insulated between an inner layer in which the first and second columnar fabrics 62 are laminated on both sides of the circular fabric 72 and an outer layer in which the first and second columnar fabrics 62 are laminated on both sides of the circular fabric 72. The structural member 82 has a sandwich structure. Therefore, it is lightweight but has excellent strength and excellent insulation and noise blocking.

As described above, according to the present invention, pipes of a predetermined length having a rectangular cross section can be continuously produced, and the produced pipes have excellent strength and excellent heat insulation and noise insulation while achieving light weight. Further, since it is reinforced in the circumferential direction, the compressive strength in the circumferential direction is superior to that in the circumferential direction. Therefore, it can be effectively applied to railway vehicle spheres.

Although the present invention has been described with reference to the above-mentioned preferred embodiments, it is possible to make various modifications or variations without departing from the spirit and scope of the invention. Accordingly, the appended claims will include any modifications or variations that fall within the spirit of the invention.

Claims (5)

After installing the cam plate on one side of the machine house equipped with the driving means and laying the main shaft, a plurality of extrusion bar attachment plates having a shape corresponding to the shape of the pipe to be formed at regular intervals are attached to the main shaft, and the plurality of extrusion bars are extruded. Assembling around the bar attachment plate and then winding steel bands around the plurality of extrusion bars to form a mold corresponding to the shape of the pipe to be molded; Sequentially injecting a first cylindrical fabric, a cylindrical fabric and a second cylindrical fabric to form an inner layer of the pipe, an insulating structural material, and a first cylindrical fabric, a cylindrical fabric and a second cylindrical fabric to form an outer layer of the pipe; Hardening the laminate comprising the inner layer, the insulating structural material and the outer layer. delete The method of claim 1, The circumferential fabric and the cylindrical fabric is a continuous pipe forming method that is a prepreg and semi-cured by coating a composite of glass fiber and carbon fiber. The method of claim 3, wherein Continuous pipe forming method in which the ratio of the circumferential fabric and the cylindrical fabric is in the range of 1: 3 to 1: 5. The method of claim 4, wherein The insulating structural member is a polyurethane foam or honeycomb structure continuous pipe forming method.

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