KR100528620B1 - Process of repetitive corrugation and straightening for workpiece - Google Patents

Abstract

The present invention relates to a repetitive wrinkle plate forming process for continuously performing the cryogenic treatment of the plate material to be rolled to form wrinkles, bending and rolling again. Repeated wrinkle sheet forming process according to the present invention is the first step (200) for cryogenic treatment of the plate material 100, and the second step (300) for rolling by bending the plate material 100 passed through the first step (200) And a third step 400 of rolling the plate 100 that has passed through the second step 300 flatly, wherein the plate 100 is made of aluminum (Al) or copper (Cu). The first step 200 is performed by charging the plate 100 or spraying the plate 100 using liquid nitrogen or dry ice. In addition, the second step 300 is performed by injecting the plate member 100 passed through the first step 200 into the wrinkle forming apparatus 322, and the third step 400 is performed by the second step 300. It is characterized in that is carried out by putting the plate (100) roughly into the flat plate forming mechanism (324). According to the present invention, the mechanical strength and elongation of the plate is increased by the increase of dislocation density in the plate to be processed, there is an advantage that the mass production of the nano-bulk material due to the continuous process.

Description

Process of Repetitive Corrugation and Straightening for workpiece

The present invention relates to a rigid plastic working method, and more particularly, to a repeating wrinkle sheet forming process of continuously repeating the process of rolling, bending and flat rolling again to form wrinkles by cryogenic treatment.

Nanotechnology (NT), which is generally defined as a technology for fabricating and utilizing materials, devices, and systems in the nanometer (nm, 10 ^-9 m) size region, that is, at the level of atomic, molecular, or macromolecular structures, It can be classified into various types according to the internal structure and application field, and there are two types of manufacturing methods, a bottom-up method and a top-down method.

The former is a method of forming and arranging nano-sized particles by moving individual atoms or molecules by physical, chemical or biological methods, and the latter by processing bulk materials by electric, chemical or mechanical methods. It is a method of gradually miniaturizing and nanonization.

The top-down method is more difficult than the bottom-up method to control atoms or molecules, but is more advantageous in terms of uniformity, size, and mass productivity of nanomaterials.

Nanobulk material is a material composed of crystals of 100nm or less in at least one direction, and many atoms are present in the grain boundary, showing superior or new properties than existing materials. These properties include not only high strength (high hardness) but also superplasticity, high electrical resistivity, low thermal conductivity, and excellent electromagnetic properties.

In particular, the nanobulk material produced by the rigid plastic processing has no internal defects or contamination compared to other manufacturing methods, it can produce a relatively large material.

In addition, grain refinement is one of the most effective methods for improving the mechanical properties such as strength and toughness of metal materials, and controlling the grain size to nano size results in nanobulk materials that exceed the limitations of conventional materials.

However, it is possible to reduce the grain size and improve the strength by extrusion, rolling, forging, drawing, etc., which is a traditional high strain processing method, but these processing methods have a problem in that the initial size of the material to be processed cannot be maintained.

In other words, the cross section, the thickness, etc. are reduced by the processing, and thus the amount of deformation that can be applied is limited.

An object of the present invention for solving the problems as described above is to provide a repeating wrinkle sheet forming process that continuously repeats the process of rolling, bending and flat rolling again to form wrinkles by cryogenic treatment of the plate.

Repeated wrinkle sheet forming process according to the present invention for achieving the object as described above, the first step of cryogenic treatment of the plate material, the second step of rolling and bending the plate material passed through the first step, and the second It characterized in that it comprises a third step of rolling a flat plate through the step.

The plate is characterized in that made of aluminum (Al) or copper (Cu) material.

The first step may be performed by charging the plate or spraying the plate using liquid nitrogen or dry ice.

The second step is characterized in that the first step is carried out by putting the sheet material through the wrinkle forming apparatus.

The third step is characterized in that is carried out by injecting the plate passed through the second step into the plate forming apparatus.

In addition, the wrinkle roller of the wrinkle forming apparatus is composed of a gear (Gear) is formed on the outer circumferential surface, the end of the gear is characterized in that the molded round.

In addition, the first step, the second step and the third step is characterized in that it is repeated a plurality of times in succession.

According to the present invention having such a configuration, the mechanical strength and elongation of the plate is increased due to the increase of dislocation density in the plate to be processed, and there is an advantage that mass production of the nanobulk material due to the continuous process is possible.

Hereinafter, with reference to the accompanying drawings, a preferred embodiment of the repeating wrinkle sheet forming process according to the present invention having the configuration as described above will be described in detail.

1 shows a schematic process conceptual diagram of a repeating wrinkle sheet forming process according to the present invention, and FIG. 2 shows a perspective view of the repeating wrinkle sheet forming apparatus used in the repeating wrinkle sheet forming process according to the present invention. 3 is a cross-sectional view showing a state that the plate passes through the corrugated roller and plate roller of the repeating wrinkle sheet forming equipment shown in FIG.

As shown in these figures, the repeating wrinkle sheet forming process can be largely divided into three stages. That is, the first step 200 for cryogenically treating the plate 100, the second step 300 for rolling and bending the plate 100 passed through the first step 200, and the second step 300 ) Is composed of a third step (400) of rolling the plate 100 roughly.

In the first step 200, the plate 100 made of aluminum (Al) or copper (Cu) is subjected to cryogenic (eg, −195.8 ° C.) treatment in liquid nitrogen.

This cryogenic treatment is performed by filling liquid nitrogen to some extent in a substantially rectangular liquid nitrogen cylinder (not shown) and dipping the plate 100. In this case, since the temperature difference between the liquid nitrogen communication and the liquid nitrogen is considerably severe, a violent reaction occurs until the temperature of the liquid nitrogen (-195.8 ° C.) and the temperature (room temperature) of the inner surface of the liquid nitrogen communication become equal to each other. Wait until the reaction of nitrogen is silent, and the plate 100 is loaded into the liquid nitrogen communication using a plate loader (not shown) formed of a handle and a mesh.

When a plurality of the plate 100 is put into the plate holder and charged into the liquid nitrogen communication, the transition phenomenon of temperature is violently similar to the reaction between the liquid nitrogen and the liquid nitrogen between the plate 100 and the liquid nitrogen. After waiting for about 5 minutes, the plate holder is taken out to obtain the plate 100 which has been cryogenically treated at the temperature of the liquid nitrogen (-195.8 ° C.).

In addition, the ultra-cold temperature treatment, that is, the first step 200 may be performed using dry ice in addition to the liquid nitrogen, and may be performed by charging or spraying a liquid into a rectangular tube as described above.

The plate material 100 which has been cryogenically treated in the first step 200 is subjected to a second step 300 which is rolled into a wrinkle shape by rolling in the wrinkle molding apparatus 322 which will be described below. The wrinkle forming apparatus 322 is composed of a wrinkle roller (322a) to rotate to form a wrinkle on the plate 100, and a wrinkle roller adjustment handle (322b) for adjusting the interval of the wrinkle roller (322a).

That is, the second step 300 is to place the plate 100 on the left plate transfer portion 326 of the repeating wrinkle sheet forming equipment 320 as shown in Figure 2 and up and down the plate transfer portion 326 When pushed into the formed pleated roller 322a, the plate 100 is moved while being rolled and bent into a pleated shape by the rotation of the pleated roller 322a.

The corrugated roller 322a is composed of a gear (Gear) formed on the outer peripheral surface of the gear teeth (322a '), the end of the gear (322a') is preferably formed round. This imparts curvature to the end of each gear (322a ') to suppress the breakage of the plate 100 due to the local machining bias that occurs when the end is an angular shape, so that the plate 100 can be processed evenly To do this.

In addition, the pleated roller 322a is composed of a pair of up and down on the basis of the plate transfer portion 326 is formed by the gear teeth (322a ') are engaged with each other. The corrugated roller 322a is a corrugated roller adjusting handle 322b formed on the corrugated roller 322a to adjust the thickness of the plate 100 to be processed by adjusting a gap between the upper and lower corrugated rollers 322a. do.

Therefore, by adjusting the interval of the wrinkle roller (322a) to the desired thickness and passing the plate 100 through the wrinkle roller (322a) is a rolling process that is evenly wrinkled on the plate 100 by the adjusted thickness Will be done.

Subsequently, the plate 100 is subjected to the third step 400 of rolling the wrinkles flat in the flat plate forming mechanism 324 formed on the side of the wrinkle roller 322a. The flat plate forming mechanism 324 is composed of a flat plate roller 324a which rotates to flatten the corrugated plate 100, and a flat plate roller adjusting handle 324b for adjusting the distance between the flat plate roller 324a.

That is, the third step 400 is the plate roller 100 is passed through the second step 300 to the plate roller 324a having a circular cross section and then automatically rotated by the rotational force of the pleated roller 322a. Transferred to and proceeded.

The flat plate roller 324a is also formed of a pair of upper and lower sides based on the plate conveying unit 326 as the corrugated roller 322a, so that the cross sections are rotated while contacting each other, and the flat plate formed on the top of the flat plate roller 324a. The roller adjusting handle 324b is rotated to unfold the wrinkles of the plate 100 by adjusting the gap between the top and bottom of the flat roller 324a.

The plate that has passed through the plate roller 324a by the rotational force of the plate roller 324a is discharged to the plate transfer part 326 on the right side of the plate roller 324a.

In addition, the above-described process may be continuously performed by continuously adding the plurality of sheets 100 cryogenically treated in the liquid nitrogen to the repeating wrinkle sheet forming apparatus 320.

In addition, the plate 100, which has passed through the third step 400, is placed in the plate holder again and subjected to extreme cold treatment in the liquid nitrogen communication to repeat the rolling process in the repeating wrinkle sheet forming equipment 320. By passing through, thereby improving the strength and tensile rate of the plate 100. In particular, this process, that is, the process of the third step 400 in the first step 200 is usually performed about 25 to 40 times.

On the other hand, Figure 4 (a) shows the change in hardness in the X direction of the two plates after performing the cryogenic plate and the cryogenic plate for 40 times the repeated wrinkle sheet forming process according to the present invention, (b) is not cryogenic treatment The plate and the cryogenically treated plate are subjected to 40 times the repeated wrinkle sheet forming process according to the present invention, and then the hardness change in the Y direction of the two plates, and (c) the plate which is not cryogenically treated and the cryogenically treated plate in the present invention. The graph showing the Z-direction hardness change of the two plates after 40 times by repeated wrinkle sheet forming process is shown.

According to this, the cryogenic treatment (-195.8 ℃) in the liquid nitrogen than the plate 100 subjected to the repeated wrinkle plate forming process of the second and third steps (300,400) without cryogenic treatment to the second, third In the plate material 100 subjected to the repeating wrinkle sheet forming process of steps 300 and 400, the strength and elongation of the X-axis, the Y-axis, and the Z-axis are high.

In other words, at room temperature without cryogenic treatment, the hardness increases up to 20 times, but afterwards, the hardness increases due to the recovery amount. After the cryogenic treatment, the hardness increases to 25 times and then decreases. The absolute hardness value is also high.

This is because dislocations are further accumulated in the cryogenically treated plate member 100 in the liquid nitrogen, and dynamic and static recovery caused by the strain energy accumulated by the repeating wrinkle sheet forming process, which is a rigid plastic process, is suppressed at cryogenic temperatures.

And (a) of Figure 5 is carried out 40 times the oxygen-free copper plate without cryogenic treatment in the repeated wrinkle plate forming process according to the present invention, the tensile properties change, (b) the cryogenic oxygen-free copper plate to the present invention Tensile properties were changed after 40 times in the repeated wrinkle sheet forming process, and (c) 30 times in the repeated wrinkled sheet forming process according to the present invention after the sheet of copper phosphate was not cryogenically treated. ) Shows a graph showing the change in tensile properties after performing the cryogenic phosphorus copper plate 30 times in the repeated wrinkle sheet forming process according to the present invention.

As shown in the figure, in the case of the cryogenic treatment of oxygen free copper (a), the tensile strength increased up to 20 times in the repeated wrinkle sheet forming process, and then decreased, whereas the cryogenic treatment was performed. (b) shows the tendency to increase up to 20 cycles of repeated wrinkle plate forming process, and then decrease slightly and then increase again.

In addition, in the case of the cryogenic treatment of Phosphorus deoxidized copper (c), the tensile strength tends to increase up to 20 times in the repeated wrinkle sheet forming process, and then decreases thereafter, whereas in the cryogenic treatment (d) It can be seen that it continues to increase even after more than 20 cycles of repeated wrinkle sheet forming.

Figure 6 (a) is a microstructure photograph after performing the repeating wrinkle sheet forming process according to the present invention in a plate material not cryogenic treatment, (b) is a cryogenic treatment of the repeat wrinkle sheet forming process according to the present invention The microstructure photograph after implementation with the plate is shown.

As shown here, the plate 100 in the repetitive wrinkle plate forming process proceeded in a cryogenically processed state (b) than the plate 100 of the repeating wrinkle plate forming process proceeded at room temperature, that is, not cryogenic treatment (a) ) Not only makes the tissue more fine, but also shows a homogeneous state.

The scope of the present invention is not limited to the above-exemplified embodiments, and many other modifications based on the present invention will be possible to those skilled in the art within the above technical scope.

As described in detail above, in the repeating wrinkle sheet forming process of the present invention, the sheet material is configured to continuously repeat the bending process to form wrinkles and flatten again by cryogenic treatment.

That is, by treating the sheet of aluminum (Al) or copper (Cu) component with cryogenic (for example, -195.8 ° C) using liquid nitrogen or dry ice, the sheet is rolled and bent to form wrinkles in the wrinkle roller of the sheet forming equipment, and then flat plate The process of rolling the pleats flat on the rollers was configured to repeat dozens of times in succession.

Accordingly, the mechanical properties are expected to be improved by increasing the strength and elongation due to the increase in dislocation density in the plate, compared to the conventional plate which is not subjected to cryogenic (-195.8 ° C.) treatment before the repeated wrinkle sheet forming process.

In addition, by providing a curvature at the end of the gear of the pleated roller of the gear shape to prevent the breakage of the plate due to the local machining bias occurring in the existing angular gear shape, it is possible to increase the number of times the repeated wrinkle sheet forming process plate The effect of improving the strength and tensile strength is also expected.

In addition, since the repeated wrinkle sheet forming process is a continuous process, it is expected to be utilized for mass production of nano bulk materials.

In addition, the use of nano bulk aluminum (Al) alloys in aircraft, automobiles, and high-speed trains is expected to be applied to the formation of precision parts for telecommunications equipment, as well as a revolutionary lightweight effect that reduces the weight to less than half. It is expected that the use of high-performance materials will increase with the development of the electronics and information and communication industries, thereby creating new applications.

1 is a schematic process conceptual diagram of a repeating wrinkle sheet forming process according to the present invention.

Figure 2 is a perspective view of a sheet forming equipment used in the repeating wrinkle sheet forming process according to the present invention.

3 is a cross-sectional view showing a state that the plate passes through the wrinkle roller and the flat plate roller of the repeating wrinkle sheet forming apparatus shown in FIG.

Figure 4 (a) is a graph showing the hardness change in the X direction of the two plates after performing the cryogenic plate and the cryogenic plate for 40 times the repeated wrinkle plate forming process according to the present invention.

Figure 4 (b) is a graph showing the hardness change in the Y direction of the two plates after performing the cryogenic plate and the cryogenic plate for 40 times the repeated wrinkle sheet forming process according to the present invention.

Figure 4 (c) is a graph showing the Z-direction hardness change of the two plates after performing the cryogenic plate and the cryogenic plate for 40 times the repeated wrinkle plate forming process according to the present invention.

Figure 5 (a) is a graph showing a change in tensile properties after performing the cryogenic oxygen-free copper plate 40 times in the repeated wrinkle sheet forming process according to the present invention.

Figure 5 (b) is a graph showing the tensile characteristics change after performing the cryogenic oxygen-free copper plate 40 times in the repeated wrinkle sheet forming process according to the present invention.

Figure 5 (c) is a graph showing a change in tensile properties after 30 times in the repeated wrinkle plate forming process according to the present invention the plate of phosphorus acid copper not subjected to cryogenic treatment.

5 (d) is a graph showing the change in tensile properties after 30 times the cryogenic plated copper phosphate treated with a repeated wrinkle plate forming process according to the present invention.

Figure 6 (a) is a photograph of the microstructure after the repeated wrinkle plate forming process according to the present invention carried out with a plate that is not cryogenically treated.

Figure 6 (b) is a microstructure photograph after performing the repeating wrinkle sheet forming process according to the present invention to a cryogenic plate.

Explanation of symbols on the main parts of the drawings

100. ..... Plate 200. ..... The first step

300. ..... 2nd step 320. ..... Repeated wrinkle sheet forming equipment

322. ..... Wrinkle Molding Apparatus 322a. ..... Wrinkle Roller

322a '..... the gear is 322b. ..... Wrinkle Roller Adjustment Handle

324. ..... Flat plate forming apparatus 324a. ..... Flatbed Roller

324b. ..... Plate Roller Adjustment Handle 326. ..... Plate Transfer Unit

400. ..... The Third Step

Claims (7)

A first step of cryogenically treating the plate, A second step of rolling and bending the sheet material having passed through the first step; Repeating wrinkle sheet forming process, characterized in that it comprises a third step of flat rolling the plate passed through the second step. The method of claim 1, wherein the plate is made of aluminum (Al) or copper (Cu). The method of claim 1, wherein the first step, Repeating wrinkle sheet forming process characterized in that the liquid nitrogen or dry ice to charge the plate or sprayed on the plate. 2. The process of claim 1, wherein the second step is performed by injecting a plate that has passed through the first step into a wrinkle forming apparatus. The repeating wrinkle sheet forming process according to claim 1, wherein the third step is performed by injecting a plate that has passed through the second step into a flat plate forming apparatus. [5] The process according to claim 1 or 4, wherein the corrugation roller of the corrugation forming mechanism is composed of gears formed with gears formed on an outer circumferential surface thereof, and end portions of the gears are formed to be rounded. . The process of claim 1, wherein the first, second and third steps are repeated a plurality of times in succession.