A method for preparing an aluminum alloy plate roller for a wide-format continuous offset printing press

Abstract

The present invention discloses a method for preparing an aluminum alloy plate roller for a wide-format continuous offset printing press, wherein the outer circumferential surface of the aluminum alloy plate roller is coated with a hardened layer. The method comprises an aluminum alloy plate roller preparation step and a hardened layer spraying and processing step. The aluminum alloy plate roller preparation step comprises the following steps: S1) preparing a hollow roller; S2) arranging a plurality of aluminum alloy plates radially and evenly spaced to form a plurality of spokes; S3) welding the top surfaces of the two side groove walls of the offset printing plate mounting groove to the inner wall surfaces of the notch; S4) inserting a rotating shaft and installing a shaft seal; S5) machining the outer circumferential surface of the roller to obtain the aluminum alloy plate roller. The method has the advantages of light overall weight and low drive energy consumption, and the hardened layer coating overcomes the wear resistance of the aluminum alloy, thereby improving the service life of the aluminum alloy plate roller.

Description

Technical Field

[0001] The invention relates to the technical field of printing machinery, and in particular to a method for preparing an aluminum alloy plate roller for a wide-width continuous offset printing press. Background Art

[0002] The plate rollers used in the existing wide-format continuous offset printing presses are imported, and are cast iron steel rollers with a wall thickness of 100mm-200mm. The plate rollers weigh 800-2000kg, resulting in high procurement costs. Due to the heavy weight of the plate rollers, they need to be driven by gear machinery, which has a large load, resulting in high energy consumption, increased manufacturing costs, and high manufacturing costs for printing companies. Summary of the Invention

[0003] In view of the above shortcomings, the purpose of the present invention is to provide a method for preparing an aluminum alloy plate roller for a wide-format continuous offset printing press to replace cast iron steel rollers and reduce the manufacturing cost and energy consumption of printing companies.

[0004] To achieve this object, the present invention adopts the following technical solutions:

[0005] A method for preparing an aluminum alloy plate roller for a wide-format continuous offset printing press, wherein the outer circumferential surface of the aluminum alloy plate roller is coated with a hardened layer. The method for preparing an aluminum alloy plate roller for a wide-format continuous offset printing press comprises the steps of preparing the aluminum alloy plate roller and spraying and processing the hardened layer. The aluminum alloy plate roller preparation step comprises the following steps:

[0006] S1) Extruding an aluminum alloy rod into a hollow roller by using an extrusion die;

[0007] S2) placing a stainless steel rotating shaft sleeve in the middle of the roller, and making the central axes of the rotating shaft sleeve and the roller be in the same straight line, and then placing a plurality of long strips of aluminum alloy plates between the rotating shaft sleeve and the roller, so that the length direction of each aluminum alloy plate extends along the axial direction of the roller, and keeping the width direction of each aluminum alloy plate extending along the radial direction of the roller, and then respectively welding the inner side edge of each aluminum alloy plate in the width direction to the outer peripheral surface of the rotating shaft sleeve, and then welding the outer side edge of the aluminum alloy plate in the width direction to the inner wall surface of the roller, so that the plurality of aluminum alloy plates are arranged radially and evenly spaced to form a plurality of spokes;

[0008] S3) forming a notch through the circumferential wall of the roller between two adjacent spokes according to the dimensions required for the wide-format continuous offset printing press, with the length of the notch extending along the axial direction of the roller; then, passing an offset printing plate mounting groove through the notch and mounting it within the roller; and welding the top surfaces of the two side walls of the offset printing plate mounting groove to the inner wall surfaces of the notch;

[0009] S4) inserting the rotating shaft into the rotating shaft sleeve, and respectively fitting shaft seals on both ends of the rotating shaft exposed from the rotating shaft sleeve, and fixing the inner side of the shaft seal facing the spoke to the exposed side of the spoke;

[0010] S5) machining the outer circumferential surface of the roller to obtain the aluminum alloy plate roller.

[0011] Specifically, in step S4), the circular runout of the outer circumferential surface of the roller is ≤0.01 mm;

[0012] In the hardened layer spraying and processing steps, the surface roughness of the hardened layer after coating and polishing is Ra≤0.2 μm.

[0013] Preferably, the outer diameter b of the roller is 400-600 mm, and the axial length L of the roller is 1200 mm-2000 mm.

[0014] Specifically, the wall thickness a of the roller is 5-10 mm, and the thickness c of the spoke is 10-15 mm.

[0015] Furthermore, the total weight of the aluminum alloy plate roller for a wide-format continuous offset printing press sprayed with the hardened layer is 50-100 kg.

[0016] Preferably, the hardened layer is a tungsten carbide coating, the Vickers hardness HV of the hardened layer is greater than 1100, and the thickness of the hardened layer is 0.05-0.2 mm.

[0017] Furthermore, the spoke is provided with a mounting hole, and the mounting hole extends along the length direction of the spoke and passes through the spoke.

[0018] Furthermore, the hardened layer spraying and processing steps include the following steps:

[0019] T1) cleaning the outer circumferential surface of the aluminum alloy plate roller, drying it, spraying tungsten carbide powder on the outer circumferential surface of the roller using a supersonic flame spraying device, and simultaneously blowing cooling air toward the inner circumferential wall of the roller during the spraying process, and cooling the roller to room temperature after the spraying is completed to obtain an aluminum alloy plate roller with a hardened layer coated on the outer circumferential surface;

[0020] T2) polishing the hardened layer using a polishing device, and detecting that the surface roughness of the hardened layer is Ra ≤ 0.2 μm, thereby obtaining the hardened layer;

[0021] In step T1), the temperature of the roller does not exceed 350°C, and the temperature of the supersonic flame is 200-300°C.

[0022] Specifically, in step T1), the particle size of the tungsten carbide powder is 5-15 μm, the powder feeding gas flow rate is 20-30 L / min, the cooling air flow rate is 50-60 L / min, and nitrogen with a flow rate of 100-200 L / min is added to the spray gun, and the surface roughness of the obtained hardened layer is Ra≤1.6 μm.

[0023] The beneficial effects of the technical solution of the present invention are as follows: the preparation method of the aluminum alloy plate roller for a wide-width continuous offset printing press, the aluminum alloy plate roller adopts a spoke-type structure, which replaces the imported rubber roller of the cast iron part in the prior art, can reduce the weight of the plate roller for a wide-width continuous offset printing press, and has the advantages of light overall weight and low driving energy consumption. The roller has the advantages of low difficulty and low cost in extrusion and surface processing, which can further reduce the manufacturing cost of the preparation process, and overcomes the defect of aluminum alloy being not wear-resistant by coating a hardened layer on the outer circumferential surface of the aluminum alloy plate roller, thereby improving the service life of the aluminum alloy plate roller for a wide-width continuous offset printing press. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic cross-sectional view of an aluminum alloy plate roller for a wide-format continuous offset printing press according to the present invention;

[0025] Figure 2 This is a schematic diagram of the installation structure of the aluminum alloy plate roller for a wide-format continuous offset printing press of the present invention;

[0026] Wherein: roller 1; offset printing plate mounting groove 2; spokes 3; shaft sleeve 4; hardened layer 5; shaft seal 6; shaft 7; mounting hole 31. DETAILED DESCRIPTION

[0027] The following is combined with Figure 1-2 The technical solution of the present invention is further illustrated through specific implementation methods.

[0028] The accompanying drawings are for illustrative purposes only and are not to be construed as limitations on this patent. To better illustrate this embodiment, some components of the accompanying drawings may be omitted, enlarged, or reduced in size, and do not represent the actual dimensions of the product. For those skilled in the art, it is understandable that some well-known structures and their descriptions may be omitted from the accompanying drawings.

[0029] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted" and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, or indirect connections through an intermediate medium, or the internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0030] A method for preparing an aluminum alloy plate roller for a wide-format continuous offset printing press, wherein the outer circumferential surface of the aluminum alloy plate roller is coated with a hardened layer 5. The method for preparing an aluminum alloy plate roller for a wide-format continuous offset printing press comprises an aluminum alloy plate roller preparation step and a hardened layer spraying and processing step, wherein the aluminum alloy plate roller preparation step comprises the following steps:

[0031] S1) Extruding an aluminum alloy rod into a hollow roller 1 by using an extrusion die;

[0032] S2) placing a stainless steel rotating shaft sleeve 4 in the middle of the roller 1, and making the central axes of the rotating shaft sleeve 4 and the roller 1 in the same straight line, then placing a plurality of long strips of aluminum alloy plates between the rotating shaft sleeve 4 and the roller 1, making the length direction of each aluminum alloy plate extend along the axial direction of the roller 1, and keeping the width direction of each aluminum alloy plate extending along the radial direction of the roller 1, then respectively welding the inner side edge of each aluminum alloy plate in the width direction to the outer peripheral surface of the rotating shaft sleeve 4, and then welding the outer side edge of the aluminum alloy plate in the width direction to the inner wall surface of the roller 1, so that the plurality of aluminum alloy plates are arranged radially and evenly spaced to form a plurality of spokes 3;

[0033] S3) according to the dimensions required by the wide-format continuous offset printing press, a notch is formed between two adjacent spokes 3, penetrating the circumferential wall of the roller 1, with the length of the notch extending along the axial direction of the roller 1; then, an offset printing plate mounting groove 2 is passed through the notch and mounted within the roller 1; and the top surfaces of the two side walls of the offset printing plate mounting groove 2 are respectively welded to the inner wall surfaces of the notch;

[0034] S4) inserting the rotating shaft 7 into the rotating shaft sleeve 4, and respectively fitting shaft seals 6 on both ends of the rotating shaft 7 exposed from the rotating shaft sleeve 4, and fixing the inner side of the shaft seal 6 facing the spoke 3 to the exposed side of the spoke 3;

[0035] S5) machining the outer circumferential surface of the roller 1 to obtain the aluminum alloy plate roller.

[0036] Figure 1 1 is a schematic cross-sectional view of the aluminum alloy plate roller for a wide-format continuous offset printing press according to the present invention. Figure 2 The present invention is a schematic diagram of the installation structure of the aluminum alloy plate roller, rotating shaft and shaft seal for a wide-format continuous offset printing press.

[0037] The offset printing plate installation slot 2 is used to install the offset printing plate used in a wide-format continuous offset printing press.

[0038] The method for preparing the aluminum alloy plate roller for a wide-width continuous offset printing press of the present invention adopts a spoke-type structure for the aluminum alloy plate roller, which replaces the imported rubber roller of the cast iron part in the prior art, can reduce the weight of the plate roller for the wide-width continuous offset printing press, and has the advantages of light overall weight and low driving energy consumption. The roller 1 has the advantages of low difficulty and low cost in extrusion and surface processing, which can further reduce the manufacturing cost of the preparation process. The hardened layer 5 is coated on the outer circumferential surface of the aluminum alloy plate roller to overcome the defect of aluminum alloy being not wear-resistant, thereby improving the service life of the aluminum alloy plate roller for the wide-width continuous offset printing press.

[0039] Specifically, in step S4), the circular runout of the outer circumferential surface of the roller 1 is ≤0.01 mm;

[0040] In the hardening layer spraying and processing steps, the surface roughness of the hardened layer 5 after coating and polishing is Ra≤0.2 μm.

[0041] A hardened layer 5 is sprayed on the outer circumference of the roller 1 with a circular runout of ≤0.01 mm. The surface roughness of the hardened layer 5 after processing is Ra≤0.2 μm, which can effectively meet the color printing quality requirement of overprint accuracy ≤0.01 mm.

[0042] Preferably, the outer diameter b of the roller 1 is 400-600 mm, and the axial length L of the roller 1 is 1200 mm-2000 mm.

[0043] The outer diameter b of the roller 1 is 400-600 mm, and the axial length of the roller 1 is 1200 mm-2000 mm, which can meet the configuration and replacement requirements of various specifications of existing wide-format continuous offset printing machines.

[0044] Furthermore, the wall thickness a of the roller 1 is 5-10 mm, and the thickness c of the spokes 3 is 10-15 mm.

[0045] Under the premise of ensuring the strength and deformation resistance of the roller 1 and the spokes 3, controlling the wall thickness of the roller 1 and the thickness of the spokes 3 within a reasonable range can effectively reduce the overall weight of the aluminum alloy plate roller, which can save material costs and reduce the driving load.

[0046] Specifically, the total weight of the aluminum alloy plate roller for a wide-format continuous offset printing press sprayed with the hardened layer 5 is 50-100 kg.

[0047] The weight of the aluminum alloy plate roller for a wide-width continuous offset printing press prepared by the present invention is only 1 / 8 to 1 / 20 of that of an imported plate roller (800 to 2000 kg), and both energy consumption and manufacturing cost have obvious advantages.

[0048] Preferably, the hardened layer 5 is a tungsten carbide coating, the Vickers hardness HV of the hardened layer 5 is greater than 1100, and the thickness of the hardened layer 5 is 0.05-0.2 mm.

[0049] The hardened layer 5 of tungsten carbide with a Vickers hardness HV greater than 1100 and a thickness of 0.05-0.2 mm makes the aluminum alloy plate roller for a wide continuous offset printing press have good wear resistance, thereby extending the service life of the aluminum alloy plate roller for a wide continuous offset printing press.

[0050] Furthermore, the spoke 3 is provided with a mounting hole 31 , and the mounting hole 31 extends along the length direction of the spoke 3 and passes through the spoke 3 .

[0051] like Figure 1 As shown, two shaft seals 6 are fixed by fastening through mounting holes 31 of the spokes 31 , so as to fix the rotating shaft 7 and improve the rotation stability of the shaft 7 .

[0052] Furthermore, the hardened layer spraying and processing steps include the following steps:

[0053] T1) cleaning the outer circumferential surface of the roller 1 of the obtained aluminum alloy plate roller, drying it, spraying tungsten carbide powder on the outer circumferential surface of the roller 1 using a supersonic flame spraying device, and simultaneously blowing cooling air toward the circumferential inner wall of the roller 1 during the spraying process. After the spraying is completed, the roller is cooled to room temperature to obtain an aluminum alloy plate roller with a hardened layer 5 coated on the outer circumferential surface;

[0054] T2) polishing the hardened layer 5 using a polishing device, and detecting that the surface roughness of the hardened layer 5 is Ra ≤ 0.2 μm, thereby obtaining the hardened layer 5;

[0055] In step T1), the temperature of the roller 1 does not exceed 350°C, and the temperature of the supersonic flame is 200-300°C.

[0056] In the process of coating the hardened layer 5 on the outer circumference of the roller 1, the temperature of the supersonic flame sprayed onto the outer circumference of the roller 1 is 200-300°C, and cooling air is blown on the inner circumference of the roller 1 at the same time to reduce the temperature of the roller 1 to ensure that the temperature of the roller 1 does not exceed 350°C, and to avoid deformation of the roller 1 due to temperature increase caused by heat during the spraying process, thereby ensuring that the surface roughness of the hardened layer 5 Ra≤0.2μm can be obtained through polishing, so that the aluminum alloy plate roller for wide-width continuous offset printing press can meet the quality requirements of overprint accuracy of color printing.

[0057] Specifically, in step T1), the particle size of the tungsten carbide powder is 5-15 μm, the powder feeding gas flow rate is 20-30 L / min, the cooling air flow rate is 50-60 L / min, and nitrogen with a flow rate of 100-200 L / min is added to the spray gun, and the surface roughness of the obtained hardened layer 5 is Ra≤1.6 μm.

[0058] If tungsten carbide powder with a particle size greater than 15 μm is used, the surface roughness of the obtained hardened layer 5 cannot meet the quality requirement of Ra≤1.6 μm.

[0059] Due to the small particle size of the tungsten carbide powder used, it is necessary to add nitrogen with a flow rate of 100-200L / min into the spray gun to prevent the tungsten carbide powder with a particle size of 5-15μm from burning during the spraying process.

[0060] If the surface roughness of the hardened layer 5 Ra>1.6 μm, the surface roughness of the hardened layer 5 after polishing cannot meet the quality requirement of Ra≤0.2 μm.

[0061] Example 1

[0062] 1. Prepare an aluminum alloy plate roller with a diameter of 450 mm, a radial length of 1300 mm, and a wall thickness of 5 mm for spraying a hardened layer 5 according to the following steps:

[0063] S1) Extruding an aluminum alloy rod into a hollow roller 1 by using an extrusion die;

[0064] S2) placing a stainless steel rotating shaft sleeve 4 in the middle of the roller 1, and making the central axes of the rotating shaft sleeve 4 and the roller 1 in the same straight line, then placing a plurality of long strips of aluminum alloy plates between the rotating shaft sleeve 4 and the roller 1, making the length direction of each aluminum alloy plate extend along the axial direction of the roller 1, and keeping the width direction of each aluminum alloy plate extending along the radial direction of the roller 1, then respectively welding the inner side edge of each aluminum alloy plate in the width direction to the outer peripheral surface of the rotating shaft sleeve 4, and then welding the outer side edge of the aluminum alloy plate in the width direction to the inner wall surface of the roller 1, so that the plurality of aluminum alloy plates are arranged radially and evenly spaced to form a plurality of spokes 3;

[0065] S3) according to the dimensions required by the wide-format continuous offset printing press, a notch is formed between two adjacent spokes 3, penetrating the circumferential wall of the roller 1, with the length of the notch extending along the axial direction of the roller 1; then, an offset printing plate mounting groove 2 is passed through the notch and mounted within the roller 1; and the top surfaces of the two side walls of the offset printing plate mounting groove 2 are respectively welded to the inner wall surfaces of the notch;

[0066] S4) inserting the rotating shaft 7 into the rotating shaft sleeve 4, and respectively fitting shaft seals 6 on both ends of the rotating shaft 7 exposed from the rotating shaft sleeve 4, and fixing the inner side of the shaft seal 6 facing the spoke 3 to the exposed side of the spoke 3;

[0067] S5) machining the outer circumferential surface of the roller 1 and then detecting whether the circular runout of the outer circumferential surface of the roller 1 meets the quality requirements, thereby obtaining the aluminum alloy plate roller.

[0068] 2. Using the aluminum alloy plate roller prepared above, an offset printing plate roller sprayed with a hardened layer 5 is prepared according to the following process, and then tested on a machine to see whether it can meet the quality requirements of color printing overprint accuracy.

[0069] T1) cleaning the outer circumferential surface of the roller 1 of the obtained aluminum alloy plate roller, drying it, spraying tungsten carbide powder on the outer circumferential surface of the roller 1 using a supersonic flame spraying device, and simultaneously blowing cooling air toward the circumferential inner wall of the roller 1 during the spraying process. After the spraying is completed, the roller is cooled to room temperature to obtain an aluminum alloy plate roller with a hardened layer 5 coated on the outer circumferential surface;

[0070] T2) polishing the hardened layer 5 using a polishing device, and detecting that the surface roughness of the hardened layer 5 is Ra ≤ 0.2 μm, thereby obtaining the hardened layer 5;

[0071] In step T1), the temperature of the roller 1 does not exceed 350°C, and the temperature of the supersonic flame is 200-300°C;

[0072] In step T1), the particle size of the tungsten carbide powder is 5-15 μm, the powder feeding gas flow rate is 20-30 L / min, the cooling air flow rate is 50-60 L / min, and nitrogen gas is introduced into the spray gun at a flow rate of 100-200 L / min;

[0073] The coating thickness of the hardened layer 5 of Example 1 is 0.15 mm, the circular runout of the coating circumferential surface is ≤0.01 mm, the surface roughness Ra of the hardened layer 5 before polishing is <1.2 μm, and the surface roughness Ra of the hardened layer 5 after polishing with a sandblasting pressure of 0.2 MPa is ≤0.2 μm. After being used on the machine, it can meet the quality requirement of color printing accuracy of ≤0.01 mm for color printing of wide-format continuous offset printing machines.

[0074] The coating thickness of the hardened layer 5 of Example 1 is 0.15 mm, the circular runout of the coating circumferential surface is ≤0.01 mm, the Ra of the hardened layer 5 before polishing is <1.2 μm, and the roughness Ra of the hardened layer 5 after polishing is ≤0.2 μm. After being used on the machine, it can meet the quality requirement of color printing accuracy of ≤0.01 mm of color printing of wide-format continuous offset printing machine.

[0075] To sum up, the preparation method of the aluminum alloy plate roller for a wide-width continuous offset printing press of the present invention adopts a spoke-type structure for the aluminum alloy plate roller, which replaces the imported rubber roller of the cast iron part in the prior art, can reduce the weight of the plate roller for a wide-width continuous offset printing press, and has the advantages of light overall weight and low driving energy consumption. The roller 1 has the advantages of low difficulty and low cost in extrusion and surface processing, which can further reduce the manufacturing cost of the preparation process. The hardened layer 5 is coated on the outer circumference of the aluminum alloy plate roller to overcome the defect of aluminum alloy being not wear-resistant, thereby improving the service life of the aluminum alloy plate roller for a wide-width continuous offset printing press.

[0076] The technical principles of the present invention have been described above with reference to specific embodiments. These descriptions are intended solely to illustrate the principles of the present invention and are not to be construed in any way as limiting the scope of protection of the present invention. Based on the explanations herein, those skilled in the art will readily conceive of other specific embodiments of the present invention without inventive effort, and such embodiments will fall within the scope of protection of the present invention.

Claims

1. A method for preparing an aluminum alloy plate roller for a wide-format continuous offset printing press, characterized in that: The outer circumferential surface of the aluminum alloy plate roller is coated with a hardened layer. The method for preparing the aluminum alloy plate roller for a wide-format continuous offset printing press comprises an aluminum alloy plate roller preparation step and a hardened layer spraying and processing step, wherein the aluminum alloy plate roller preparation step comprises the following steps: S1) Extruding an aluminum alloy rod through an extrusion die to produce a hollow roller; S2) placing a stainless steel rotating shaft sleeve in the middle of the roller, and aligning the central axes of the rotating shaft sleeve and the roller, and then placing a plurality of long aluminum alloy plates between the rotating shaft sleeve and the roller, so that the length direction of each aluminum alloy plate extends along the axial direction of the roller, and the width direction of each aluminum alloy plate extends along the radial direction of the roller, and then respectively welding the inner side edge of each aluminum alloy plate in the width direction to the outer peripheral surface of the rotating shaft sleeve, and then welding the outer side edge of the aluminum alloy plate in the width direction to the inner wall surface of the roller, so that the plurality of aluminum alloy plates are arranged radially and evenly spaced to form a plurality of spokes; S3) forming a notch through the circumferential wall of the roller between two adjacent spokes according to the dimensions required by the wide-format continuous offset printing press, with the length of the notch extending along the axial direction of the roller; then, passing an offset printing plate mounting groove through the notch and mounting it within the roller; and welding the top surfaces of the two side walls of the offset printing plate mounting groove to the inner wall surfaces of the notch; S4) inserting the rotating shaft into the rotating shaft sleeve, and respectively fitting shaft seals on both ends of the rotating shaft exposed from the rotating shaft sleeve, and fixing the inner side of the shaft seal facing the spoke to the exposed side of the spoke; S5) machining the outer circumferential surface of the roller to obtain the aluminum alloy plate roller; The wall thickness a of the roller is 5-10 mm, the circular runout of the outer circumference of the roller is ≤0.01 mm, and the surface roughness Ra of the hardened layer after processing is ≤0.2 μm; The hardened layer spraying and processing steps include the following steps: T1) cleaning the outer circumferential surface of the aluminum alloy plate roller, drying it, spraying tungsten carbide powder on the outer circumferential surface of the roller using a supersonic flame spraying device, and simultaneously blowing cooling air toward the inner circumferential wall of the roller during the spraying process. After the spraying is completed, the roller is cooled to room temperature to obtain an aluminum alloy plate roller with a hardened layer coated on the outer circumferential surface; T2) polishing the hardened layer using a polishing device, and inspecting the surface roughness of the hardened layer to determine if Ra is less than or equal to 0.2 μm, thereby obtaining the hardened layer; In step T1), the temperature of the roller does not exceed 350°C, and the temperature of the supersonic flame is 200-300°C.

2. The method for preparing an aluminum alloy plate roller for a wide-format continuous offset printing press according to claim 1, characterized in that: In the hardened layer spraying and processing steps, the surface roughness of the hardened layer after coating and polishing is Ra≤0.2 μm.

3. The method for preparing an aluminum alloy plate roller for a wide-format continuous offset printing press according to claim 1, wherein: The outer diameter b of the roller is 400-600 mm, and the axial length L of the roller is 1200 mm-2000 mm.

4. The method for preparing an aluminum alloy plate roller for a wide-format continuous offset printing press according to claim 1, wherein: The thickness c of the spoke is 10-15 mm.

5. The method for preparing an aluminum alloy plate roller for a wide-format continuous offset printing press according to claim 1, wherein: The total weight of the aluminum alloy plate roller for a wide-format continuous offset printing press sprayed with the hardened layer is 50-100 kg.

6. The method for preparing an aluminum alloy plate roller for a wide-format continuous offset printing press according to claim 1, characterized in that: The hardened layer is a tungsten carbide coating, the Vickers hardness HV of the hardened layer is greater than 1100, and the thickness of the hardened layer is 0.05-0.2 mm.

7. The method for preparing an aluminum alloy plate roller for a wide-format continuous offset printing press according to claim 1, characterized in that: The spoke is provided with a mounting hole, and the mounting hole extends along the length direction of the spoke and passes through the spoke.

8. The method for preparing an aluminum alloy plate roller for a wide-format continuous offset printing press according to claim 1, characterized in that: In step T1), the particle size of the tungsten carbide powder is 5-15 μm, the powder feeding gas flow rate is 20-30 L / min, the cooling air flow rate is 50-60 L / min, and nitrogen gas with a flow rate of 100-200 L / min is added to the spray gun. The surface roughness of the obtained hardened layer is Ra ≤ 1.6 μm.

Images