Round steel bending die and bending method

Abstract

The invention provides a round steel bending die and a bending method, the round steel bending die comprises upper dies and lower dies, round steel to be bent is placed between the upper dies and the lower dies, and the two lower dies are arranged on the two sides of the single upper die in the length direction of the round steel. When an oil press acts on the upper surface of the upper die top seat, the rolling shaft can rotate around the axis of the rolling shaft, the rolling shaft can still be attached to the surface of the lower die radius adjusting guide sleeve of the lower die after round steel is pressed and bent, pressure is evenly transmitted, and the whole bending process is more stable and reliable. Meanwhile, the radius adjusting guide sleeve is detachably connected and can be flexibly replaced according to the size of the round steel, and the fitting degree with the surface of the round steel is guaranteed. In addition, the position of the lower die can be flexibly moved through the design of the inserting holes in the bottom plate, and different opening distances can be flexibly adopted according to different lengths of the round steel. The bending efficiency of the round steel can be effectively improved, the round steel of different models and lengths can be machined in an adjustable mode, and rapid forming of round steel machining is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical processing, in particular to a round steel bending die and a bending method. Background Art

[0002] In the shipbuilding industry, the midship where the left and right sides of the stern section outer plate meet is linear, and is basically round steel, which needs to be processed into a curved shape. The diameter of the round steel ranges from 80-200mm, and how to process it quickly, efficiently and accurately is a technical challenge.

[0003] Due to the special characteristics of round steel, traditional processing technology uses heating processing or rolling. Heating processing refers to using fire to heat the round steel to be processed, using external force and manpower to force bending. The disadvantages are high cost and long cycle. It not only consumes a lot of kinetic energy, but also consumes a lot of manpower. The performance of the product changes after heating, the construction is unsafe, the product has knocking marks, and the quality is poor. Rolling refers to the use of rolling equipment for strong bending. The disadvantages are that there will be roller marks on the surface of the round steel, the round steel is deformed, the product quality is poor, and the streamlined performance of the ship is affected. At present, there is no method to bend round steel efficiently, with high quality and safety.

[0004] In view of this technical problem, the purpose of the present invention is to provide a new bending die and a new round steel bending method to improve the efficiency, quality and safety of round steel bending. Summary of the invention

[0005] In view of the above-mentioned shortcomings of the prior art, the present invention provides a round steel bending mold, which includes an upper mold and a lower mold;

[0006] The upper mold comprises an upper mold top seat, an upper mold guide sleeve and an upper mold radius adjustment guide sleeve which are sequentially connected from top to bottom; the upper surface of the upper mold top seat is a plane, which serves as a downward pressure surface of the hydraulic press; the upper mold guide sleeve and the upper mold radius adjustment guide sleeve are both semi-cylindrical and arch upward, and the upper mold radius adjustment guide sleeve is detachably superimposed on the lower surface of the upper mold guide sleeve, and a concave first arc groove is formed on the lower surface of the upper mold top seat, and the upper surface of the upper mold guide sleeve is fitted and fixed in the first arc groove;

[0007] The lower mold comprises a roller, a connecting block, a lower mold top seat, a lower mold guide sleeve and a lower mold radius adjustment guide sleeve which are sequentially connected from bottom to top; the lower mold guide sleeve and the lower mold radius adjustment guide sleeve are both semi-cylindrical and concave downwards, the lower mold radius adjustment guide sleeve is detachably superimposed on the upper surface of the lower mold guide sleeve, the upper surface of the lower mold top seat is formed with a concave second arc groove, and the lower surface of the lower mold guide sleeve is fitted and fixed in the second arc groove;

[0008] In the vertical direction, the round steel to be bent is placed between the upper die radius adjustment guide sleeve and the lower die radius adjustment guide sleeve; along the length direction of the round steel, the two lower dies are arranged on both sides of a single upper die.

[0009] Optionally, the axis of the roller is perpendicular to the length direction of the round steel, and the roller can rotate around its own axis.

[0010] Optionally, the lower mold is located between two parallel vertical baffles, and both ends of the roller are mounted to the vertical baffles.

[0011] Optionally, a baffle reinforcement is fixed to the surface of the vertical baffle away from the lower mold, and the baffle reinforcement is perpendicular to the vertical baffle.

[0012] Optionally, the round steel bending mold further includes a bottom plate, the vertical baffle is placed on the bottom plate, and the bottom of the vertical baffle and the bottom of the baffle reinforcement are both in contact with the upper surface of the bottom plate.

[0013] Optionally, the bottom plate is provided with a plurality of insertion holes arranged in an array, the insertion holes are used to insert pins, and the vertical baffle and the outer periphery of the baffle reinforcement are tightly attached with a plurality of pins to limit the vertical baffle.

[0014] The present invention also provides a bending method of the round steel bending die, comprising the following steps:

[0015] S1: Information verification, verify the material, diameter, length and parts information of the incoming materials;

[0016] S2: Die radius adjustment: according to the diameter of the part to be bent, the radius adjustment guide sleeves of the upper and lower dies are used to adjust the matching radius of the upper and lower dies;

[0017] S3: Lower mold opening adjustment: adjust the opening distance L of the two lower molds according to the diameter D and material of the part to be bent;

[0018] S4: Marking: for the parts to be processed, mark out the pressing line, which is the center line of the surface of the round steel.

[0019] S5: Segmented linear pressing, first press the two ends of the round steel, then press the middle, a single pressing segment is 1m;

[0020] S6: Segmented linear detection, while pressing and testing. During the test, a 1m long short sample is placed on the upper surface of the round steel to test whether the short sample fits the curvature of the round steel;

[0021] S7: Overall linear pressing, after the pressing is completed section by section, the entire part is pressed as a whole;

[0022] S8: Overall linear inspection: Use the corresponding long sample plate to inspect the overall linear shape of the entire part, check whether the long sample plate fits the curvature of the round steel, and perform fine-tuning on the areas where the linear shape fits out of tolerance;

[0023] S9: Information transplantation: Place the processed parts on a horizontal platform and transplant the relevant information.

[0024] Optionally, in step S3, L=k*D; for ordinary steel with a yield strength of 200MPa-350MPa, k is 2.5-5; for high-strength steel with a yield strength of 350MPa-1000MPa, k is 5-8.

[0025] As described above, the present invention provides a round steel bending mold and a bending method, wherein the round steel bending mold comprises an upper mold and a lower mold, wherein the upper mold comprises an upper mold top seat, an upper mold guide sleeve and an upper mold radius adjustment guide sleeve, and the lower mold comprises a roller, a connecting block, a lower mold top seat, a lower mold guide sleeve and a lower mold radius adjustment guide sleeve, and the round steel to be bent is placed between the upper mold radius adjustment guide sleeve and the lower mold radius adjustment guide sleeve, and along the length direction of the round steel, the two lower molds are arranged on both sides of a single upper mold. When the hydraulic press acts on the upper surface of the upper mold top seat, the roller can rotate around its own axis, and as the round steel is compressed and bent, it can still maintain surface contact with the lower mold radius adjustment guide sleeve of the lower mold, and the pressure is evenly transmitted, and the entire bending process is more stable and reliable. At the same time, the radius adjustment guide sleeve is a detachable connection, which can be flexibly replaced according to the size of the round steel to ensure the contact with the surface of the round steel. In addition, the socket design of the bottom plate can flexibly move the position of the lower mold, so as to flexibly adopt different opening distances according to the different lengths of the round steel.

[0026] Compared with conventional processes, the present invention can simply and effectively improve the bending efficiency of round steel, improve the quality of round steel bending, and greatly save labor costs, energy consumption, etc. The mold system has the characteristics of simple and efficient operation, adjustable processing of round steel of different models and lengths, and good product quality. Compared with conventional processing methods, this mold system not only improves the safety of operation and processing accuracy, but also realizes rapid prototyping of round steel processing, greatly saving round steel processing time and rework time. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 Shown is a schematic diagram of the three-dimensional structure of the round steel bending mold in Example 1 of the present invention.

[0028] Figure 2 Shown is a side structural schematic diagram of the round steel bending mold in Example 1 of the present invention.

[0029] Figure 3 It shows a schematic diagram of the connection between the lower mold and the vertical baffle in the first embodiment of the present invention.

[0030] Figure 4 Shown is a schematic diagram of the three-dimensional structure of the lower mold in Example 1 of the present invention.

[0031] Figure 5 It is a schematic diagram of the process flow of the bending method in the second embodiment of the present invention.

[0032] Component number description

[0033] Upper mold top seat 151; upper mold guide sleeve 152; upper mold radius adjustment guide sleeve 153; roller 141; connecting block 142; lower mold top seat 143; lower mold guide sleeve 144; lower mold radius adjustment guide sleeve 145; round steel 100; vertical baffle 131; baffle reinforcement 132; bottom plate 11; latch 12. DETAILED DESCRIPTION

[0034] The following describes the embodiments of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention.

[0035] For example, when describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional view showing the device structure will not be partially enlarged according to the general scale, and the schematic view is only an example, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional space dimensions of length, width and depth should be included.

[0036] For ease of description, spatial relational terms such as "under", "below", "below", "below", "above", "on", etc. may be used herein to describe the relationship of one element or feature shown in the drawings to other elements or features. It will be understood that these spatial relational terms are intended to include other directions of the device in use or operation in addition to the directions depicted in the drawings. In addition, when a layer is referred to as being "between" two layers, it can be the only layer between the two layers, or there can be one or more intervening layers. As used herein, "between..." means including the end point values.

[0037] In the context of the present application, a structure in which a first feature is described as being "above" a second feature may include embodiments in which the first and second features are formed in direct contact, and may also include embodiments in which additional features are formed between the first and second features, such that the first and second features may not be in direct contact.

[0038] It should be noted that the illustrations provided in this embodiment are only used to illustrate the basic concept of the present invention in a schematic manner, and therefore the illustrations only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0039] Embodiment 1

[0040] like Figures 1 to 4 As shown, this embodiment provides a round steel bending mold, which includes an upper mold and a lower mold:

[0041] The upper mold includes an upper mold top seat 151, an upper mold guide sleeve 152 and an upper mold radius adjustment guide sleeve 153 which are connected in sequence from top to bottom; the upper surface of the upper mold top seat 151 is a plane, which serves as a downward pressure surface of the hydraulic press;

[0042] The upper mold guide sleeve 152 and the upper mold radius adjustment guide sleeve 153 are both semi-cylindrical and arch upward. The upper mold radius adjustment guide sleeve 153 is detachably stacked on the lower surface of the upper mold guide sleeve 152. The lower surface of the upper mold top seat 151 is formed with a concave first arc groove. The upper surface of the upper mold guide sleeve 152 is fitted and fixed in the first arc groove.

[0043] The lower mold comprises a roller 141, a connecting block 142, a lower mold top seat 143, a lower mold guide sleeve 144 and a lower mold radius adjustment guide sleeve 145 which are sequentially connected from bottom to top; the lower mold guide sleeve 144 and the lower mold radius adjustment guide sleeve 145 are both semi-cylindrical and concave downwards, and the lower mold radius adjustment guide sleeve 145 is detachably superimposed on the upper surface of the lower mold guide sleeve 144, and an inwardly concave second arc groove is formed on the upper surface of the lower mold top seat 143, and the lower surface of the lower mold guide sleeve 144 is fitted and fixed in the second arc groove;

[0044] In the vertical direction, the round steel 100 to be bent is placed between the upper die radius adjustment guide sleeve 153 and the lower die radius adjustment guide sleeve 145 ; along the length direction of the round steel, the two lower dies are arranged on both sides of a single upper die.

[0045] Furthermore, the axis of the roller 141 is perpendicular to the length direction of the round steel 100, and the roller 141 can rotate around its own axis.

[0046] The lower mold is located between two parallel vertical baffles 131, and both ends of the roller 141 are installed to the vertical baffles 131 to realize the rotation of the roller. The rotation of the roller is beneficial to the compression and bending deformation of the round steel. After the round steel is compressed and bent, it can still maintain surface contact with the lower mold radius adjustment guide sleeve 145 of the lower mold, thereby increasing the force-bearing surface and evenly transmitting the pressure, making the entire bending process more stable and reliable.

[0047] The upper mold top seat 151 is connected to the upper mold guide sleeve 152 by a fixed method such as welding, and the upper mold guide sleeve 152 and the upper mold radius adjustment guide sleeve 153 are detachably connected, such as bolted, so that the corresponding upper mold radius adjustment guide sleeve can be flexibly replaced according to the size of the round steel to ensure the fit with the round steel surface. Similarly, the roller 141, the connecting block 142, the lower mold top seat 143, and the lower mold guide sleeve 144 are connected by a fixed method such as welding, and the lower mold guide sleeve 144 and the lower mold radius adjustment guide sleeve 145 are detachably connected, such as bolted. The connecting block 142 is mainly used to connect the roller 141 and the lower mold top seat 143, and is welded. The connecting block is in the shape of an arch bridge, and its lower surface is formed with an arc groove that fits the roller surface, and the upper surface is a plane to fix the lower mold top seat.

[0048] Furthermore, a baffle reinforcement 132 is fixed to the surface of the vertical baffle 131 away from the lower mold, and the baffle reinforcement 132 is perpendicular to the vertical baffle 131. The round steel bending mold also includes a bottom plate 11, and the bottom plate 11 is provided with a plurality of plug holes arranged in an array. The vertical baffle 131 is placed on the bottom plate 11, and the bottom of the vertical baffle 131 and the bottom of the baffle reinforcement 132 are in contact with the upper surface of the bottom plate 11.

[0049] The socket is used to insert the pin 12. The periphery of the vertical baffle 131 and the baffle reinforcement 132 is tightly attached with multiple pins 12 to limit the vertical baffle. The design of the socket can flexibly move the position of the vertical baffle, thereby changing the position of the lower mold, so as to flexibly adopt different opening distances according to the different lengths of the round steel, that is, the distance between the two lower molds.

[0050] As an example, the dimensions of each component are described in detail below.

[0051] The upper mold top seat is a rectangular parallelepiped, and the pressure of the hydraulic press directly acts on the upper surface of the upper mold top seat. The upper mold guide sleeve is a semicircular tube with an inner diameter of 200mm and a thickness of 10mm. The upper mold top seat and the upper mold guide sleeve are connected by welding. The upper mold radius adjustment guide sleeve is a semicircular tube, and the radius value is made by the user according to his own needs. A flexible connection is adopted between the upper mold guide sleeve and the upper mold radius adjustment guide sleeve for easy replacement.

[0052] The bottom plate is 2000mm long, 700mm wide, and 20mm thick. There is an opening on it with a diameter of 31mm, which is convenient for the movement and fixation of the vertical baffle and the lower mold. The pin has a diameter of 30mm and is used to fix the various components. The vertical baffle and the baffle reinforcement are connected by welding. The size of the vertical baffle is 400mm*400mm and the thickness is 20mm. The baffle reinforcement is a triangular plate with a width of 150mm, a height of 250mm, and a thickness of 20mm. The roller is a round steel with a diameter of 130mm. It is in direct contact with the vertical baffle without welding, which is convenient for rotation during processing. A protective cover can be set on the outside to prevent it from slipping out. The connecting block is connected to the roller by welding, the connecting block is connected to the top seat of the lower mold by welding, the top seat of the lower mold is connected to the guide sleeve of the lower mold by welding, and the radius adjustment guide sleeve of the lower mold is connected to the guide sleeve of the lower mold without welding, so as to facilitate replacement. The mold in this example can be applied to the processing of round steel with a diameter ranging from 80mm to 200mm. The processed line type is inspected with relevant samples.

[0053] Embodiment 2

[0054] Based on the round steel bending mold in the first embodiment, this embodiment provides a bending method using the round steel bending mold, such as Figure 5 As shown, the following steps are included:

[0055] S1: Information verification. Verify the material, diameter, length, parts information, etc. of the incoming materials to ensure that the parts, drawings, samples, etc. are consistent. For example, Q235 steel has a diameter of 180mm and a length of 4m.

[0056] S2: Die radius adjustment. According to the diameter of the part to be bent, adjust the radius of the upper and lower dies through the radius adjustment guide sleeves of the upper and lower dies. The inner diameter of the radius adjustment guide sleeve is 180mm and the thickness is 10mm to ensure that it fits the surface of the round steel.

[0057] S3: Adjust the opening of the lower die. According to the diameter D and material of the part to be bent, adjust the opening distance L of the two lower dies, L = k*D, k coefficient, for ordinary steel round bars (yield strength of 200MPa ~ 350MPa), k is 2.5 ~ 5; for high-strength steel round bars (yield strength of 350MPa ~ 1000MPa), k is 5 ~ 8. Here k is 3, opening L = 3*180 = 540mm.

[0058] S4: Marking. Mark the parts to be processed and mark the pressing line (usually a surface center line of round steel) for pressing and testing.

[0059] S5: Segmented linear pressing. Press the two ends of the round steel first, usually 1m each, and then press the middle.

[0060] S6: Segmented linear detection. When pressing, press segment by segment and detect while pressing. When testing, place a short sample of about 1m long on the upper surface of the round steel to detect whether the short sample fits the curvature of the round steel.

[0061] Taking the pressing of the left end of round steel as an example, a surface center line is drawn 0.5m away from the left end. The upper mold is pressed downward under the drive of the hydraulic cylinder. After each pressing, a short sample is used to test the curvature. When the curvature does not conform to the short sample, pressing is performed again. The operation is repeated several times until the segmented line shape conforms to the curvature of the short sample.

[0062] S7: Overall linear pressing. After the segment-by-segment pressing is completed, the entire part needs to be pressed as a whole to ensure the smoothness of the overall linear shape.

[0063] S8: Overall linear inspection. Use the corresponding long sample to inspect the overall linear shape of the entire part, check whether the long sample fits the curvature of the round steel, and perform fine-tuning on the areas where the linear shape fits out of tolerance.

[0064] S9: Information migration. Place the processed parts on a horizontal platform and migrate the relevant information.

[0065] In summary, the present invention provides a round steel bending mold and a bending method, the round steel bending mold comprises an upper mold and a lower mold, the upper mold comprises an upper mold top seat, an upper mold guide sleeve and an upper mold radius adjustment guide sleeve, the lower mold comprises a roller, a connecting block, a lower mold top seat, a lower mold guide sleeve and a lower mold radius adjustment guide sleeve, the round steel to be bent is placed between the upper mold radius adjustment guide sleeve and the lower mold radius adjustment guide sleeve, and along the length direction of the round steel, the two lower molds are arranged on both sides of a single upper mold. When the hydraulic press acts on the upper surface of the upper mold top seat, the roller can rotate around its own axis, and as the round steel is compressed and bent, it can still maintain surface contact with the lower mold radius adjustment guide sleeve of the lower mold, and the pressure is evenly transmitted, and the entire bending process is more stable and reliable. At the same time, the radius adjustment guide sleeve is a detachable connection, which can be flexibly replaced according to the size of the round steel to ensure the fit with the surface of the round steel. In addition, the socket design of the bottom plate can flexibly move the position of the lower mold to flexibly adopt different opening distances according to the different lengths of the round steel.

[0066] Compared with conventional processes, the present invention can simply and effectively improve the bending efficiency of round steel, improve the quality of round steel bending, and greatly save labor costs, energy consumption, etc. The mold system has the characteristics of simple and efficient operation, adjustable processing of round steel of different models and lengths, and good product quality. Compared with conventional processing methods, this mold system not only improves the safety of operation and processing accuracy, but also realizes rapid prototyping of round steel processing, greatly saving round steel processing time and rework time.

[0067] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A round steel bending die, characterized in that: The round steel bending die comprises an upper die and a lower die; The upper mold comprises an upper mold top seat, an upper mold guide sleeve and an upper mold radius adjustment guide sleeve which are sequentially connected from top to bottom; the upper surface of the upper mold top seat is a plane, which serves as a downward pressure surface of the hydraulic press; the upper mold guide sleeve and the upper mold radius adjustment guide sleeve are both semi-cylindrical and arch upward, and the upper mold radius adjustment guide sleeve is detachably superimposed on the lower surface of the upper mold guide sleeve, and a concave first arc groove is formed on the lower surface of the upper mold top seat, and the upper surface of the upper mold guide sleeve is fitted and fixed in the first arc groove; The lower mold comprises a roller, a connecting block, a lower mold top seat, a lower mold guide sleeve and a lower mold radius adjustment guide sleeve which are sequentially connected from bottom to top; the lower mold guide sleeve and the lower mold radius adjustment guide sleeve are both semi-cylindrical and concave downwards, the lower mold radius adjustment guide sleeve is detachably superimposed on the upper surface of the lower mold guide sleeve, the upper surface of the lower mold top seat is formed with a concave second arc groove, and the lower surface of the lower mold guide sleeve is fitted and fixed in the second arc groove; In the vertical direction, the round steel to be bent is placed between the upper die radius adjustment guide sleeve and the lower die radius adjustment guide sleeve; along the length direction of the round steel, the two lower dies are arranged on both sides of a single upper die.

2. The round steel bending die according to claim 1, characterized in that: The axis of the roller is perpendicular to the length direction of the round steel, and the roller can rotate around its own axis.

3. The round steel bending die according to claim 2, characterized in that: The lower mold is located between two parallel vertical baffles, and both ends of the roller are mounted to the vertical baffles.

4. The round steel bending die according to claim 3, characterized in that: A baffle reinforcement is fixed on the surface of the vertical baffle away from the lower mold, and the baffle reinforcement and the vertical baffle are perpendicular to each other.

5. The round steel bending die according to claim 4, characterized in that: The round steel bending mold also includes a bottom plate, the vertical baffle is placed on the bottom plate, and the bottom of the vertical baffle and the bottom of the baffle reinforcement are both in contact with the upper surface of the bottom plate.

6. The round steel bending die according to claim 5, characterized in that: The bottom plate is provided with a plurality of insertion holes arranged in an array, and the insertion holes are used to insert pins. The vertical baffle and the outer periphery of the baffle reinforcement are tightly attached with a plurality of pins to limit the vertical baffle.

7. A method for bending a round steel bending die as claimed in claim 6, characterized in that: The steps include: S1: Information verification, verify the material, diameter, length and parts information of the incoming materials; S2: Die radius adjustment: according to the diameter of the part to be bent, the radius adjustment guide sleeves of the upper and lower dies are used to adjust the matching radius of the upper and lower dies; S3: Lower mold opening adjustment: adjust the opening distance L of the two lower molds according to the diameter D and material of the part to be bent; S4: Marking: for the parts to be processed, mark out the pressing line, which is the center line of the surface of the round steel. S5: Segmented linear pressing, first press the two ends of the round steel, then press the middle, a single pressing segment is 1m; S6: Segmented linear detection, while pressing and testing. During the test, a 1m long short sample is placed on the upper surface of the round steel to test whether the short sample fits the curvature of the round steel; S7: Overall linear pressing, after the pressing is completed section by section, the entire part is pressed as a whole; S8: Overall linear inspection: Use the corresponding long sample plate to inspect the overall linear shape of the entire part, check whether the long sample plate fits the curvature of the round steel, and perform fine-tuning on the areas where the linear shape fits out of tolerance; S9: Information transplantation: Place the processed parts on a horizontal platform and transplant the relevant information.

8. The bending method according to claim 7, characterized in that: In step S3, L=k*D; for ordinary steel with a yield strength of 200MPa-350MPa, k is 2.5-5; for high-strength steel with a yield strength of 350MPa-1000MPa, k is 5-8.

Images