KR100576019B1 - Redusia and manufacturing method - Google Patents

Abstract

The present invention relates to a manufacturing method of a redundancy and a redundancy, which are pipe connecting pipes connecting different diameters to each other, and in particular, a press after locally heating one end of a pipe connecting pipe connected to a distal end of a small pipe. It relates to a reducer (reducer) and the manufacturing method of the reducer having a diameter of both ends by a forging method to have a diameter of a different size.

In detail, the present invention provides a manufacturing method comprising: a cutting step of cutting a pipe to a predetermined length; A heating step of heating one end of the cut pipe with a high frequency heater; A conduit tube forging the heated end by a press and conduit; It relates to a manufacturing method characterized in that it comprises a heat treatment step of annealing heat treatment of the conduit product.

High frequency burner, reducer, press forging

Description

Redusia and manufacturing method of redusia {omitted}

1 is a perspective view of a redusian.

2 is a schematic diagram of pipe heating using a high frequency heater.

3 is a schematic view of the tube being rolled by press forging.

<Explanation of symbols on main parts of the drawings>

1: pipe 2: jig

3: clamp 4: cylinder

5: induction coil 6: case

7: punch 8: mold groove

9: Redusia

The present invention relates to a redundancy, which is a pipe connector for connecting pipes of different diameters to each other, and in particular, by locally rapid rapid heating of one end of a pipe connector connecting to a tip of a small pipe, using a punch and a mold. The present invention relates to a manufacturing method of a reduxia and a reduxia, in which a diameter of both ends is formed to have diameters of different sizes by a press forging method.

In general, redundancies are used to connect pipes of different diameters together, and a large diameter pipe and a small diameter pipe are welded by placing a redness between a large diameter pipe and a small diameter pipe and welding the joints connected to each pipe. Connect it.

Such a reducer is manufactured by heating the pipe to a constant temperature and then forming a different diameter at both ends in a required shape by applying a blow and pressure, but using a fossil fuel such as bunker seed oil and gas in a pipe in a heating furnace. In particular, inexpensive bunker seed oil is used as the main heating fuel. And the pipe heated by combustion, such as bunker seed oil, is conveyed to a press by a worker, and is shape | molded.

However, in the conventional manufacturing method such as a fuel for heating, an oil fuel such as bunker seed oil is used, so that a lot of pollution and harmful substances such as sulfur dioxide, carbon dioxide, carbon monoxide, soot and dust are emitted during the combustion process. There is a problem that severely pollutes and worsens the working environment.

In particular, the poor working environment according to the discharge of pollution and harmful substances to the workers to cause various respiratory diseases to provide adverse health effects, resulting in a problem that the supply and demand of manpower is not properly performed.

Moreover, since the heating method in the conventional manufacturing method is heated regardless of the size of the pipe, it could not be uniformly heated to a suitable temperature according to the size or material of the pipe. Therefore, a problem arises in that a high quality forging product cannot be produced due to a poor heating of the forging material.

In addition, when the pipe is heated in the furnace using fossil fuel, the flame directly reaches the pipe, so sulfur or unburned oil generated by the combustion of the fuel penetrates into the pipe, resulting in a high defect rate of the product.

Redusia molding method of the present invention for solving the above problems by using a high-frequency heater, using electrical thermal energy instead of fossil fuel can not discharge environmental pollutants to improve the working environment, the processing of the product It is an object of the present invention to provide a manufacturing method capable of locally heating only necessary portions, which can greatly reduce a defect rate of a product.

The present invention provides a manufacturing method comprising: a cutting step of cutting a pipe to a predetermined length; A heating step of heating one end of the cut pipe with a high frequency heater; A conduit tube forging the heated end by a press and conduit; It relates to a manufacturing method characterized in that it comprises a heat treatment step of annealing heat treatment of the conduit product.

The heating step is a process of locally heating one end of the pipe to be piped to the appropriate length in the cutting step, the heating to a proper temperature using a high-frequency heater, the high-frequency heater is a pipe insertion hole is formed in the case An induction coil is installed inside the case, and the induction coil is enclosed around the outer circumferential surface of the pipe in which the pipe is inserted into the insertion hole.The insertion or exit of the pipe into the high frequency heater is performed by a jig holding one end of the pipe. do. To prevent the induction coil from being damaged when the pipe is inserted into or exited from the high frequency heater, the induction coil is installed to be spaced apart from the pipe by a certain distance. It is done by The jig is provided at the distal end of the jig, and the induction coil, the jig and the tong are operated by a control panel, and the jig functions to fix the pipe at a predetermined position while the pipe is heated. In this case, only the pipe portion inserted into the center of the induction coil is characterized in that the local heating.

In the condenser tube step, the locally heated portion is press-forged using a punch and a mold to condense one side of the pipe with a smaller diameter. The punch has one end of the punch body fixed to the punch holder of the press machine and the pressurized portion at the other end. The pressing unit is characterized in that the insertion portion for forming the tube is placed in the mold groove by pressing the upper surface of the pipe placed in the mold groove.

In addition, in the reduxia formed by cutting the pipe to a certain length, one end of the redusan is heated by a high-frequency heater, and the heated end is forged by a press for condensing and then subjected to annealing. It is about.

The heating portion of the reducer is heated to an appropriate temperature using a high frequency heater, and the high frequency heater is formed with a pipe insertion hole in the case, and an induction coil is installed inside the case, and the pipe is inducted around the outer circumferential surface of the pipe inserted into the insertion hole. The coil is enclosed and the insertion or withdrawal of the pipe into the high frequency heater is operated by a jig holding one end of the pipe. To prevent the induction coil from being damaged when the pipe is inserted into or exited from the high frequency heater, the induction coil is installed to be spaced apart from the pipe by a certain distance. It is done by The jig is provided at the distal end of the jig, and the induction coil, the jig and the tong are operated by a control panel, and the jig functions to fix the pipe at a predetermined position while the pipe is heated. At this time, only the pipe portion inserted into the center of the induction coil is characterized in that the local heating.

The present invention relates to a manufacturing method of a redundancy and a redundancy, which are pipe connecting pipes connecting different diameters to each other, in particular, forging presses after locally rapid heating of end portions of pipe connecting pipes connected to the ends of pipes having small dimensions. It relates to a reducer (reducer) and the manufacturing method of the manufacturing process to press the method to form a diameter of both ends having a diameter of a different size.

In detail, a high frequency heater is used to rapidly heat the stainless steel pipes at a heating temperature of 1000 to 1300 ° C, carbon steel pipes to 680 to 800 ° C, and copper and brass pipes to 380 to 450 ° C, and then punch and mold. By using a press forging method using a diameter of both ends of the pipe piping material having a diameter of a different size and relates to a manufacturing method and a reduxia.

The high frequency heater places the derivative (pipe) in the middle of the coil through which the high frequency current flows, so that the derivative rapidly heats through heat loss of Eddycurent and some hysteresis caused by the electrical induction of the derivative. Device.

In more detail, the high frequency heater has a magnetic flux on the surface layer of the inductor due to the oscillation effect of the oscillation and the primary current flowing through the coil on the surface of the object due to the oscillation and the proximity effect flowing on the surface layer close to the coil. Eddy currents are concentrated, and the resulting heat loss (Hysteresis) refers to a device that heats the derivative.

Therefore, the manufacture of reduxia using a high frequency heater has various problems due to the combustion of bunker seed oil, that is, no emission of pollutants, no emission of sparks to the outside, and very efficient workability. The problem can be solved.

When the redusian molding method according to the present invention will be described in detail with the accompanying drawings.

FIG. 1 is a perspective view of a reducer, FIG. 2 is a schematic diagram of heating a pipe using a high frequency heater, and FIG. 3 is a schematic diagram of conduit pipe forming by press forging.

In the present invention, when looking at the manufacturing method of the different diameters of both ends step by step, the cutting step of cutting the pipe to a certain length, the heating step of heating one end of the cut pipe with a high frequency heater, and heating A conduit tube forging the end portion by forging a press; It characterized in that it comprises a heat treatment step of annealing the conduit product.

The cutting step is a step of constantly cutting the hollow pipe to a desired size, and is cut into a press cutter or a gas cutter and a machine saw, which are generally used pipe cutters.

The heating step is a process of locally heating one end to be axially piped in a pipe cut to a proper length in a cutting step, and heating to a proper temperature using a high frequency heater.

The high frequency heater has a pipe insertion hole formed in the case, the induction coil is installed inside the case, the induction coil is configured to surround the outer peripheral surface of the pipe is inserted into the insertion hole. In addition, the insertion or withdrawal of the pipe into the high frequency heater is operated by a jig holding one end of the pipe. It is natural that the induction coil is installed at a distance from the pipe to prevent the induction coil from being damaged when the pipe is inserted into or exited from the high frequency heater. Insertion or withdrawal of the pipe is made by a jig movement that is moved back and forth by the hydraulic cylinder. The tip of the jig is provided with a tong for picking up the pipe, the operation of the induction coil and the jig and the tong is made by a control panel, the control panel is a publicly known technique that is openly performed by those skilled in the art of automatic control Detailed description will be omitted. The jig functions to hold the pipe in a fixed position while the pipe is heated, with only the pipe part inserted in the center of the induction coil being locally heated.

The temperature for locally heating a part of the pipe using the high frequency heater as described above may vary depending on the material or size of the pipe or the working environment. For example, a stainless steel pipe may have a heating temperature of 1000 to 1300 ° C. 680-800 ° C, copper and brass pipes are preferably heated to 380-450 ° C.

The heating method using the high frequency heater has a relatively high thermal efficiency compared to the direct heating using conventional fossil raw materials, extremely low oxidation of the object to be heated by the short time heating, local heating and free selection of curing depth, and heating temperature. Easy to set, there is an advantage to improve the wear resistance and fatigue resistance of the product. In addition, it is easy to automate because it can be connected to the machining line, and it is possible to precisely adjust the heating temperature and heating time, so that mass production of uniform products is possible. There is this.

Particularly, in the conventional direct heating technique using fossil raw materials, an additional process of rapidly cooling a pipe that is not desired to be formed after heating the pipe as a whole requires an additional process, whereas in the present invention, a cooling operation of an undesired portion is performed. There is an advantage that the production process is simpler because there is no need to do.

In the condenser tube step, the locally heated portion is press-forged using a punch and a mold to condense one side of the pipe with a smaller diameter.

The locally heated part of the pipe is placed in a mold cavity (cavity), which determines the preliminary appearance of the reddish body, and the other end of the pipe (opposite to the heated part) is punched to make a different diameter at both ends of the pipe. Sized reducers are molded and manufactured. At this time, it is preferable that the punch moves at an appropriate speed to pressurize the pipe, and therefore, it is preferable to use a hydraulic press whose speed is relatively easy to adjust.

The punch is fixed to one end of the punch body is installed in the punch holder of the press machine, the other end of the pressing portion is pressed to the upper surface of the pipe placed in the mold groove is formed with an insertion portion for the tube is placed in the mold groove. The shape of the insertion unit may vary depending on the shape of the redusia to be produced. That is, the condensed pipe part may have the same center as the pipe part of the original pipe, but the conduit may be manufactured to have an eccentricity. It is therefore obvious that the insert of the punch must also vary accordingly.

Figure 3, presented as a temporary view, shows a punch and a mold used in the manufacture of a redness with the same center as the original pipe. This press forging molding method is a known technique that is conventionally carried out by those skilled in the art.

The heat treatment step is a step of annealing heat treatment of the reducer molded to a different size of the diameter of both ends of the pipe by the press forging operation. A process for heating a pipe formed of pipes having different diameters to a temperature sufficient to diffuse enough and then gradually cooling the material to stabilize the material as shown in the equilibrium diagram. In a material in which a phase change occurs as the temperature rises or lowers, it is cooled slowly over a sufficient time to complete all the changes as shown in the state diagram to obtain a stable equilibrium state. It cools slowly at high temperature and gives time to cool down while spreading equilibrium at each temperature by diffusion. In addition, in the case of deformation or lattice defects caused by processing or the like, the hardened crystalline solid is heated at a temperature above the recrystallization temperature, that is, a temperature at which the atoms of the main component are sufficiently diffused and moved. To achieve the purpose. Since the state which can be obtained by annealing is often the softest state in the material, the word annealing has the meaning of the heat treatment operation which obtains the softest state.

In the present invention, the annealing heat treatment step is heated to a heating temperature of 300 ~ 450 ℃, it is preferable to gradually cool the cooling time at room temperature about 1 to 3 hours.

In addition, in the present invention, it may further include a surface treatment step after the condensation step. In other words, as a step to remove rust or contaminants on the pipe surface, the compressed air is sprayed together with abrasive particles to hit the surface of the workpiece at a high speed to remove rust or foreign matter on the pipe surface. Can be added.

The surface treatment of the pipe is performed by sand blasting method using glass grains or siliceous sand, shot peening method using fine cast iron, cast steel and glass grains, and fine particle size. Work by using liquid horning method, which is sprayed with water and polished with water.

In addition, in the present invention, the edge portion may be polished after the heat treatment step to chamfer, or to form a screw at both ends of the redusia.

Chamfering the corner portion as described above is to facilitate welding during piping work, and to form a screw to form a screw.

The redischer of the present invention is the main point to locally heat one end of the pipe, the reddisher having an inner diameter of 2 inches or less may heat the pipe as a whole.

The present invention relates to a process for manufacturing reduxia and reduxia, which are pipe connectors that connect pipes of different diameters to each other, and in particular, by forming a mold by locally heating one end of the pipe connecting pipe which is coupled to the tip of a small pipe. Since there is no need to perform the cooling work of unwanted parts, the production process is simpler. Also, fossil fuel does not emit environmental pollutants by using high frequency heater which operates electric heat energy instead. It is possible to improve the environment, to locally heat only the necessary portion of the product to be heated, and to easily set the heating temperature, thereby reducing the defective rate of the product.

Claims (5)

delete In the manufacturing method of the reducer (9), The cutting step of cutting the pipe (1) to a predetermined length; A heating step of heating one end of the cut pipe 1 with a high frequency heater; A conduit tube forging the heated end by a press and conduit; It includes a heat treatment step of annealing heat treatment of the conduit product, the heating step is a step of partially heating the one end to be piped to the pipe (1) cut to the appropriate length in the cutting step, using a high frequency heater Heated to a temperature, the high-frequency heater is a pipe insertion hole is formed in the case 6 and the induction coil 5 is installed inside the case 6, the circumference of the outer peripheral surface of the pipe 1, the pipe 1 is inserted into the insertion hole The furnace induction coil 5 is enclosed and the insertion or withdrawal of the pipe 1 into the high frequency heater is operated by a jig 2 holding one end of the pipe 1 and the pipe 1 to the high frequency heater. Induction coil (5) is installed at a distance from the pipe (1) in order to prevent damage to the induction coil (5) when inserted or removed), the insertion or insertion of the pipe (1) Ejection is made by the jig (2) movement forward and backward by the pneumatic cylinder (4), the front end of the jig (2) is provided with a tongs (3) for picking up the pipe (1), the index The operation of the coil 5 and the jig 2 and the tongs 3 is performed by a control panel, which is used to move the pipe 1 at a constant position while the pipe 1 is heated. A function of fixing, wherein only a portion of the pipe (1) inserted into the center of the index coil (5) is locally heated. The method according to claim 2, wherein the condenser tube step is to press-forge the locally heated portion by using a punch 7 and a mold to condense one side of the pipe 1 to a smaller diameter. One end is fixedly installed in the punch holder of the press, and the other end of the pressurization portion presses the upper surface of the pipe 1 placed in the mold groove 8 to insert the pipe 1 placed in the mold groove 8 to the tube. Reduxia manufacturing method characterized in that the addition. delete In the reducer 9 formed by cutting the pipe 1 to a certain length, one end of the reducer 9 is heated by a high frequency heater and the heated end is forged by a press, condensed, and then subjected to annealing heat treatment. The heating portion of the reducer (9) is heated to an appropriate temperature by using a high frequency heater, the high frequency heater is a pipe insertion hole is formed in the case 6 and the induction coil (5) is installed inside the case (6), The induction coil 5 is enclosed around the outer circumferential surface of the pipe 1 in which the pipe 1 is inserted into the insertion hole. The insertion or withdrawal of the pipe 1 into the high frequency heater is carried by the one end of the pipe 1 The induction coil 5 is spaced from the pipe 1 to prevent damage to the induction coil 5 when the pipe 1 is inserted into or exited from the high frequency heater. Installed, phase Insertion or withdrawal of pipe (1) is made by the jig (2) movement forward and backward by the hydraulic and pneumatic cylinder (4), the front end of the jig (2) tongs for picking up the pipe (3) (3) Is installed, the operation of the index coil, jig (2) and tongs (3) is made by a control panel, the jig (2) is a fixed position of the pipe (1) while the pipe (1) is heated The function of fixing the pipe (1) in, at this time only the portion of the pipe (1) inserted into the center of the index coil is locally heated.

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