Apparatus for forming magnesium alloy pipes and control method thereof

Abstract

Disclosed is an apparatus for forming magnesium alloy pipes. The apparatus for forming magnesium alloy pipes comprises: a heater unit that heats a workpiece to a preset temperature and maintains the raised temperature; a die unit in which the size of a forming space varies according to the rotational force generated while rotating; a moving unit for moving the heated workpiece into the forming space; and a processor that adjusts the rotational angular velocity of the die unit according to the axial pipe size of the heated workpiece, forms the workpiece according to the varied size of the forming space according to the rotational angular velocity, and adjusts the heating performance of the heater unit according to the rotational angular velocity. Accordingly, precise plastic forming of magnesium alloys becomes possible, and the quality of magnesium alloy formed products is uniformly maintained so that the defect rate decreases.

Description

Magnesium alloy pipe forming device and its control method

[0001] The present invention relates to a magnesium alloy pipe forming device and a control method thereof, and more particularly, to a forming device for forming a magnesium alloy pipe by controlling the rotational angular velocity of a mold portion, and a control method thereof.

[0002] Magnesium alloy is a lightweight metal material with low density among available structural materials, and is attracting attention due to its excellent properties such as high specific strength, machinability, and vibration absorption.

[0003] These magnesium alloys are increasingly being used in place of aluminum alloys in recent years to meet the demand for lighter vehicles to improve fuel efficiency. Furthermore, their application in products such as mobile phones and laptops is increasing due to the demand for lightweight, compact designs and superior electromagnetic shielding.

[0004] However, magnesium alloys have problems in that they have relatively low strength, ductility, and corrosion resistance compared to aluminum alloys, and although the ductility of magnesium alloys can be improved by increasing the processing temperature, there was a problem in that their use was limited due to the difficulty in compression molding products with complex shapes or sharp corners.

[0005] Accordingly, in order to improve the formability of magnesium alloy processed materials, warm forming is performed at a temperature of 200℃ or higher, at which the non-surface slip is activated.

[0006] As this warm forming process is performed on magnesium alloys, there is an increasing demand for the development of various technologies to enable more precise and precise forming of magnesium alloys.

[0007] The purpose of the present invention is to provide a forming device for forming a magnesium alloy pipe by controlling the rotational angular velocity of a mold portion, and a control method thereof.

[0008] In order to achieve the above object, a magnesium alloy pipe forming device according to one embodiment of the present invention includes a heater unit for heating a processing object to a preset temperature and maintaining the elevated temperature, a mold unit for generating a forming space whose size is variable in response to a rotational force generated while rotating, a moving unit for moving the heated processing object into the forming space, and a processor for controlling a rotational speed of the mold unit in response to a shaft pipe size of the heated processing object, for forming and processing the processing object according to the size of the forming space generated and variable in response to the rotational speed, and for controlling a heating performance of the heater unit in response to the rotational speed.

[0009] Here, the mold part includes a plurality of mold frames, and each of the plurality of mold frames has a distance from the rotational axis that changes in response to the rotational force, and the processor can adjust the size of the molding space based on the distance from the rotational axis.

[0010] In addition, the processor can increase the rotational angular velocity of the mold portion to increase the distance from the rotational axis as the shaft size of the heated processing object increases, and can decrease the rotational angular velocity of the mold portion to decrease the distance from the rotational axis as the shaft size of the heated processing object decreases.

[0011] In addition, the heater unit includes a high-frequency heater unit and an air heater unit, and the high-frequency heater unit is disposed at the front end of the mold unit to heat the object to be processed to the preset temperature before the object to be processed enters the molding space and to maintain the elevated temperature, and the air heater unit is disposed at one side of the mold unit and one side of the object to be processed entering the mold unit to maintain the elevated temperature of the object to be processed.

[0012] In addition, the processor can increase the heating performance of the air heater unit as the rotational angular velocity of the mold unit increases, and can decrease the heating performance of the air heater unit as the rotational angular velocity of the mold unit decreases.

[0013] In addition, the processor controls the high-frequency heater section to raise and maintain a temperature in a range of 200°C or more and 400°C or less, controls the air heater section to maintain a temperature in a range of 200°C or more and 400°C or less, and can control the rotation speed of the mold section in a range of 20 RPM or more and 400 RPM or less.

[0014] Meanwhile, a control method for a magnesium alloy pipe forming apparatus according to an embodiment of the present invention includes the steps of heating a processing object to a preset temperature and maintaining the heated temperature, rotating a mold to generate a rotational force, and varying the size of a forming space in response to the generated rotational force, moving the heated processing object into the forming space, and adjusting a rotational speed of the mold in response to a shaft pipe size of the heated processing object, forming and processing the processing object according to the size of the forming space generated by varying the rotational speed, and adjusting a heating performance of a heater in response to the rotational speed.

[0015] According to various embodiments of the present invention as described above, precise plastic forming processing for magnesium alloys becomes possible, and the quality of magnesium alloy molded products is maintained at a constant level, thereby reducing the defect rate.

[0016] FIG. 1 is a block diagram illustrating the configuration of a magnesium alloy pipe forming device according to one embodiment of the present invention.

[0017] FIG. 2 is a drawing illustrating an embodiment of a magnesium alloy pipe forming device according to one embodiment of the present invention.

[0018] FIG. 3 is a drawing for explaining the change in size of a molding space according to rotation of a mold part according to one embodiment of the present invention.

[0019] FIG. 4 is a drawing for explaining the operation process of a high-frequency heater unit and an air heater unit according to one embodiment of the present invention.

[0020] FIG. 5 is a flowchart for explaining a control method of a magnesium alloy pipe forming device according to one embodiment of the present invention.

[0021] FIG. 6 is a perspective view of a magnesium alloy molded product molded by a magnesium alloy pipe molding device according to an embodiment of the present invention.

[0022] Hereinafter, the present invention will be described in more detail with reference to the drawings. Furthermore, in describing the present invention, detailed descriptions of related known functions or configurations will be omitted if they are deemed to unnecessarily obscure the gist of the invention. Furthermore, the terms described below are defined based on their functions in the present invention and may vary depending on the intentions or relationships of the user or operator. Therefore, their definitions should be based on the overall content of this specification.

[0023] FIG. 1 is a block diagram illustrating the configuration of a magnesium alloy pipe forming device according to one embodiment of the present invention.

[0024] Referring to FIG. 1, a magnesium alloy pipe forming device (100) includes a heater section (110), a mold section (120), a moving section (130), and a processor (140).

[0025] Here, the magnesium alloy pipe forming device (100) performs plastic forming by raising and maintaining the elevated temperature for the object to be processed, i.e., the magnesium alloy, while applying pressure to the magnesium alloy at the elevated temperature while the mold part (120) described below rotates.

[0026] Specifically, the heater unit (110) heats the object to be processed to a preset temperature and maintains the elevated temperature. To this end, the heater unit (110) is positioned along the movement path of the object to be processed so that the elevated temperature is maintained before the object to be processed is injected into the magnesium alloy pipe forming device (100) and after the object to be processed is discharged to the outside after undergoing the forming process.

[0027] Meanwhile, the processing target according to one embodiment of the present invention is mainly a cylindrical pipe made of a magnesium alloy material, and undergoes plastic forming to adjust the diameter or radius size of the pipe. This process is called a pipe forming process, and the diameter or radius size of the pipe that has undergone the pipe forming process is defined as the pipe size.

[0028] In addition, the mold part (120) rotates based on the rotation axis, and the size of the molding space can be changed and created in response to the rotational force generated while rotating.

[0029] Specifically, the mold part (120) is composed of a plurality of mold frames, and each of the plurality of mold frames is gathered around a rotation axis. Then, when the mold part (120) rotates, each of the plurality of mold frames moves away from the rotation axis due to the rotational force, that is, centrifugal force. Consequently, as the rotational force becomes stronger, the plurality of mold frames, which are gathered around the rotation, gradually spread out around the rotation axis.

[0030] The space created by the rotational force of multiple mold frames becoming apart becomes a molding space, and the object to be processed moves into this molding space. The object to be processed, while maintained at an elevated temperature, is plastically molded by the pressure of each of the multiple mold frames within the molding space.

[0031] In addition, the moving part (130) moves the heated processing object into the molding space, and moves the processing object within a moving speed range of 5 mm / s to 100 mm / s.

[0032] Meanwhile, the processor (140) can adjust the rotational speed of the mold part (120) in response to the shaft size of the heated processing target, mold and process the processing target according to the size of the molding space created by varying in response to the rotational speed, and adjust the heating performance of the heater part (110) in response to the rotational speed.

[0033] Here, the shaft size of the heated processing object refers to the size of the cross-section of the heated processing object to be formed, and can be defined as the radius size or diameter size by length in the forming progress direction.

[0034] For example, if the molded product of the heated processing target is conical in shape, the shaft size becomes smaller and smaller as the processing target advances in the direction of travel.

[0035] In addition, the processor (140) can control the rotational speed of the mold part (120) according to the size of the shaft tube, and can shape and process the object to be processed according to the size of the molding space that is generated by changing in response to the rotational speed.

[0036] Specifically, as the processor (140) gradually increases the rotational angular velocity of the mold portion (120), the plurality of mold frames described above are increasingly spread apart from the rotational axis, thereby increasing the size of the molding space, and thus the size of the shaft of the heated processing object can be molded to also increase.

[0037] In addition, as the processor (140) gradually lowers the rotational angular velocity of the mold section (120), the plurality of mold frames described above gradually come closer to the rotation axis and gather together, thereby reducing the size of the molding space, and thus the size of the shaft of the heated processing object can be formed to be reduced.

[0038] For example, when the molded product of the heated processing target has a cone shape, the size of the shaft tube should gradually decrease as the processing target moves in the progress direction. Therefore, when the heated processing target enters the molding space, the processor (140) increases the rotational angular velocity of the mold part (120) so that the shaft tube size of the processing target is formed to be large. As the processing target enters the molding space and moves in the molding progress direction, the processor (140) gradually decreases the rotational angular velocity of the mold part (120) so that the shaft tube size of the processing target is formed to be gradually smaller, so that the shape of the processing target becomes a cone shape.

[0039] Meanwhile, the processor (140) can adjust the performance of the heater unit (110) in response to the rotational angular velocity, which will be described later.

[0040] Meanwhile, FIG. 2 is a drawing illustrating an embodiment of a magnesium alloy pipe forming device according to an embodiment of the present invention.

[0041] Referring to FIG. 2, a magnesium alloy pipe forming device (100) according to an embodiment of the present invention has a heater unit (110) positioned at one side of the object to be processed (10), an inlet of the forming space within the mold unit (120), and an outlet of the forming space within the mold unit (120) before the object to be processed (10) enters the forming space within the mold unit (120), and a moving unit (130) moves the object to be processed (10) so that it can enter the forming space within the mold unit (120).

[0042] In addition, the processor (140) controls the heater unit (110) to heat the processing target (10) to a preset temperature and maintain the elevated temperature, controls the moving unit (130) to move the processing target (10) at a speed of 5 mm / s to 100 mm / s, and controls the rotational angular velocity of the mold unit (120) to adjust the shaft size of the processing target (10) to form the processing target.

[0043] FIG. 3 is a drawing for explaining the change in size of a molding space according to rotation of a mold part according to one embodiment of the present invention.

[0044] Referring to FIG. 3, the mold part (120) may include a plurality of mold frames (121, 122, 123, 124). Here, each of the plurality of mold frames (121, 122, 123, 124) may be two or four. For example, when the plurality of mold frames are two, one mold frame may be implemented in an upwardly convex and concave shape (hat shape), and the portion forming the internal molding space (125) may be an arc corresponding to half of a circle rather than an arc corresponding to 1 / 4 of a circle as in FIG. 3.

[0045] In FIG. 3, a plurality of mold frames (121, 122, 123, 124) forming a mold part (120) are gathered around a rotation axis to form a molding space (125), and when the mold part (120) rotates clockwise (127) around the rotation axis, the plurality of mold frames (121, 122, 123, 124) move away from the rotation axis due to rotational force, i.e., centrifugal force, and the distance (126) apart from the rotation axis changes depending on the strength of the rotational force.

[0046] In addition, the processor (140) can adjust the size of the molding space (125) based on the distance (126) from the rotational axis that changes according to the rotational angular velocity by adjusting the rotational angular velocity of the mold part (120).

[0047] For example, when the shaft size of the processing target (10) is larger than the existing molding shaft size, the processor (140) increases the rotational angular velocity of the mold part (120) to increase the distance (126) at which the plurality of mold frames (121, 122, 123, 124) are spaced from the rotation axis, thereby expanding the size of the molding space (125) and molding the shaft size of the processing target (10) to be larger.

[0048] In addition, when the shaft size of the processing target (10) is smaller than the existing molding shaft size, the processor (140) reduces the rotational angular velocity of the mold part (120) to reduce the distance (126) at which the plurality of mold frames (121, 122, 123, 124) are spaced from the rotation axis, thereby narrowing the size of the molding space (125) and molding the shaft size of the processing target (10) to be smaller.

[0049] That is, as the shaft size of the heated processing object (10) increases, the processor (140) can increase the rotational angular velocity of the mold part (120) to increase the distance (126) separated from the rotational axis, and as the shaft size of the heated processing object (10) decreases, the processor (140) can decrease the rotational angular velocity of the mold part (120) to decrease the distance (126) separated from the rotational axis.

[0050] Meanwhile, the heater unit (110) may include a high-frequency heater unit and an air heater unit.

[0051] FIG. 4 is a drawing for explaining the operation process of a high-frequency heater unit and an air heater unit according to one embodiment of the present invention.

[0052] Referring to FIG. 4, the heater unit (110) may include a high-frequency heater unit (111) and a plurality of air heater units (112).

[0053] Here, the high-frequency heater section (111) is arranged at the front end of the mold section (120), i.e., around the entrance, so as to raise the temperature of the object to be processed (10) to a preset temperature before the object to be processed (10) enters the molding space (125) and maintain the raised temperature.

[0054] In addition, each of the plurality of air heater parts (112) is arranged on one side of the mold part (120) and one side of the object to be processed (10) entering the mold part (120) to maintain the elevated temperature of the object to be processed (10).

[0055] This is because, due to the nature of magnesium alloys, the tissue crystal structure can only change at a specific temperature, and plastic forming processing becomes possible at this specific temperature. Magnesium alloys also have very high thermal conductivity, so the cooling rate is very fast, so it is very important to maintain the elevated temperature when the forming distance is long (e.g., 100 mm or more).

[0056] Accordingly, as shown in FIG. 4, a high-frequency heater part (111) is arranged around the entrance of the mold part (120), and one side of the object to be processed (10) and one side of the mold part (120) are arranged toward the discharge port so that the object to be processed (10) can be maintained at an elevated temperature and an isothermal temperature, i.e., an elevated temperature, from the time the object to be processed (10) enters the mold part (120) until it is discharged after undergoing molding processing.

[0057] Meanwhile, the processor (140) can increase the heating performance of the air heater unit (112) as the rotational speed of the mold unit (120) increases, and can decrease the heating performance of the air heater unit (112) as the rotational speed of the mold unit (120) decreases.

[0058] Specifically, as the rotational angular velocity of the mold part (120) increases, the distance at which each of the plurality of mold frames (121, 122, 123, 124) is spaced from the rotation axis increases, and the size of the molding space (125) increases, so that the shaft size of the object to be processed (10) increases, and accordingly, the cross-sectional area of ​​the object to be processed (10) increases.

[0059] In addition, in order to maintain the elevated temperature of the processing target (10) with a wider cross-sectional area, the processor (140) increases the performance of the air heater unit (112) to discharge a larger amount of heated air, thereby maintaining the temperature so that the processing target (10) is not cooled as the cross-sectional area is widened.

[0060] In addition, as the rotational angular velocity of the mold part (120) decreases, the distance at which each of the plurality of mold frames (121, 122, 123, 124) is spaced from the rotation axis decreases, so that the size of the molding space (125) becomes smaller, and the size of the shaft of the object to be processed (10) becomes smaller, and accordingly, the cross-sectional area of ​​the object to be processed (10) becomes narrower.

[0061] And, in order to maintain the elevated temperature of the processing target (10) with a narrowed cross-sectional area, the processor (140) can maintain the temperature of the processing target (10) by reducing the performance of the air heater unit (112) to discharge a smaller amount of heated air.

[0062] As described above, the processor (140) can adjust the rotational speed of the mold part (120) in response to the shaft size of the processing target (10), and increase or decrease the heating performance of the heater part (110) according to the adjusted rotational speed.

[0063] Meanwhile, the processor (140) controls the high-frequency heater unit (111) to increase and maintain the temperature in the range of 200°C to 400°C, so that the preset temperature of the object to be processed (10) also falls within the range of 200°C to 400°C, and controls the air heater unit (112) to maintain the temperature in the range of 200°C to 400°C, so that the object to be processed (10) is also maintained at a temperature in the range of 200°C to 400°C. In addition, the processor (140) can control the rotational speed of the mold unit (120) in the range of 20 RPM to 400 RPM, and as described above, can control the rotational speed by increasing or decreasing the rotational angular speed.

[0064] FIG. 5 is a flowchart for explaining a control method of a magnesium alloy pipe forming device according to one embodiment of the present invention.

[0065] Referring to FIG. 5, a control method of a magnesium alloy pipe forming apparatus according to an embodiment of the present invention includes a step (S510) of heating a processing object to a preset temperature and maintaining the elevated temperature, a step (S520) of rotating a mold part to generate a rotational force and varying the size of a forming space in response to the generated rotational force, a step (S530) of moving the heated processing object into the forming space, and a step (S540) of adjusting a rotational speed of the mold part in response to the shaft size of the heated processing object, performing forming processing according to the size of the forming space generated by varying the rotational speed, and adjusting the heating performance of the heater part in response to the rotational speed.

[0066] In addition, the operation process of the above-described processor (140) can all be performed identically by the control method of the magnesium alloy pipe forming device according to one embodiment of the present invention.

[0067] Meanwhile, FIG. 6 is a perspective view of a magnesium alloy molded product molded by a magnesium alloy pipe molding device according to an embodiment of the present invention.

[0068] Referring to FIG. 6, it can be seen that the diameter or radius of the formed magnesium alloy product, i.e., the formed processing target (10), is changed, which means that the shaft size is changed.

[0069] The molded processing object (10) of Fig. 6 can be mainly used as a shaft of a golf club, and in the case of such a shaft, it can be seen that the shaft size is changed and nodes are formed on the surface.

[0070] All of these joints formed on the size or surface of the shaft can be formed and processed according to the control method of the magnesium alloy pipe forming device (100) or the magnesium alloy pipe forming device according to one embodiment of the present invention.

[0071] As described above, a non-transitory computer readable medium storing a program for sequentially performing a control method of a magnesium alloy pipe forming apparatus according to the present invention can be provided.

[0072] A non-transitory readable medium refers to a medium that permanently stores data and can be read by a device, rather than a medium that stores data for a short period of time, such as a register, cache, or memory. Specifically, the various applications or programs described above may be stored and provided on non-transitory readable media, such as a CD, DVD, hard disk, Blu-ray disc, USB, memory card, or ROM.

[0073] In addition, although the preferred embodiments of the present invention have been illustrated and described above, the present invention is not limited to the specific embodiments described above, and various modifications can be made by a person having ordinary skill in the art to which the present invention pertains without departing from the gist of the present invention claimed in the claims, and such modifications should not be understood individually from the technical idea or prospect of the present invention.

Claims

1. A heater section for heating a processing target to a preset temperature and maintaining the elevated temperature; A mold part created by changing the size of the molding space in response to the rotational force generated while rotating; A moving part that moves the heated processing object into the molding space; and A magnesium alloy pipe forming device comprising a processor for controlling the rotational speed of the mold section in response to the shaft size of the heated processing object, forming and processing the processing object according to the size of a forming space created by changing in response to the rotational speed, and controlling the heating performance of the heater section in response to the rotational speed.

2. In paragraph 1, The above mold part, It comprises a plurality of mold frames, and each of the plurality of mold frames has a distance changed from the rotational axis in response to the rotational force. The above processor, A magnesium alloy pipe forming device which controls the size of the forming space based on the distance from the rotation axis.

3. In paragraph 2, The above processor, A magnesium alloy pipe forming device, wherein as the shaft size of the heated processing object increases, the rotational speed of the mold part is increased to increase the distance from the rotational axis, and as the shaft size of the heated processing object decreases, the rotational speed of the mold part is decreased to decrease the distance from the rotational axis.

4. In paragraph 3, The above heater part, It includes a high-frequency heater section and an air heater section. The above high frequency heater part, It is arranged at the front end of the mold section to heat the object to be processed to the preset temperature before the object to be processed enters the molding space and to maintain the elevated temperature. The above air heater part, A magnesium alloy pipe forming device, which is arranged on one side of the mold section and one side of a processing object entering the mold section to maintain the elevated temperature of the processing object.

5. In paragraph 4, The above processor, A magnesium alloy pipe forming device, wherein the heating performance of the air heater part increases as the rotational angular velocity of the mold part increases, and the heating performance of the air heater part decreases as the rotational angular velocity of the mold part decreases.

6. In paragraph 5, The above processor, The above high-frequency heater section is controlled to raise and maintain the temperature in a range of 200℃ or higher and 400℃ or lower, The above air heater part is controlled to maintain the temperature in the range of 200℃ or higher and 400℃ or lower. A magnesium alloy pipe forming device, wherein the rotation speed of the mold part is controlled within a range of 20 RPM or more and 400 RPM or less.

7. A step of heating the processing target to a preset temperature and maintaining the elevated temperature; A step of generating rotational force by rotating a mold part and changing the size of a molding space in response to the generated rotational force; A step of moving the heated processing object into the molding space; and A control method for a magnesium alloy pipe forming device, comprising: a step of controlling a rotational speed of a mold portion corresponding to a shaft size of the heated processing target; forming and processing the processing target according to a size of a forming space created by changing the rotational speed; and controlling a heating performance of a heater portion corresponding to the rotational speed.

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