Calendering roller and production method thereof

Abstract

The invention discloses a calendering roller and a production method thereof, and relates to the technical field of glass production. The calendering roller comprises a roller blank, a protective layer and a spraying layer. The protective layer and the spraying layer are sequentially arranged outside the circumferential surface of the roller blank, the roller blank is made of a chromium-tungsten alloy material, the protective layer is made of a nickel-chromium alloy material, the spraying layer is made of a chromium carbide alloy, aluminum oxide or tungsten carbide material, the spraying layer is used for being in contact with a glass melt, and the protective layer is used for increasing the binding force of the roller blank and the spraying layer. Compared with the prior art, the calendering roller provided by the invention adopts the protective layer and the spraying layer which are arranged outside the peripheral surface of the roller blank, so that the calendering roller has better oxidation resistance and higher bonding strength, the conditions of oxidation and falling of the plating layer can be effectively avoided, the service life is prolonged, and the calendering effect and the product quality are ensured.

Description

Technical Field

[0001] The invention relates to the technical field of glass production, and in particular to a calendering roller and a production method thereof. Background Art

[0002] At present, with the widespread application of microcrystalline glass in the mobile phone cover industry, the demand for mass production of large-size, ultra-thin microcrystalline glass is increasing rapidly. The traditional production line uses a calender to form a calender and a platinum channel to feed the material to achieve mass production of microcrystalline glass. However, the calender rollers in the calender are operated under high temperature and high-intensity extrusion pressure for a long time, which will cause oxidation on the surface, resulting in greater roughness of the roller surface, which makes the glass melt unevenly distributed, affecting the calendering effect, and the oxidized roller coating may fall off, affecting the service life of the calender roller and the surface quality of the microcrystalline glass, and even causing the microcrystalline glass to fail to form and collect normally.

[0003] In view of this, it is particularly important to design a calendering roller with good anti-oxidation performance and long service life and a production method thereof, especially in glass production. Summary of the invention

[0004] The purpose of the present invention is to provide a calendering roller with good anti-oxidation performance and high bonding strength, which can effectively avoid oxidation and shedding of the coating, extend the service life, and ensure the calendering effect and product quality.

[0005] Another object of the present invention is to provide a method for producing a calendering roller, wherein the calendering roller produced by the method has good anti-oxidation performance and high bonding strength, can effectively avoid oxidation and shedding of the coating, extend the service life, and ensure the calendering effect and product quality.

[0006] The present invention is achieved by adopting the following technical solutions.

[0007] A calendering roller comprises a roller blank, a protective layer and a sprayed layer, wherein the protective layer and the sprayed layer are sequentially arranged outside the circumference of the roller blank, the roller blank is made of a chromium-tungsten alloy material, the protective layer is made of a nickel-chromium alloy material, the sprayed layer is made of a chromium carbide alloy, alumina or tungsten carbide material, the sprayed layer is used for contacting with a glass melt, and the protective layer is used for increasing the bonding force between the roller blank and the sprayed layer.

[0008] Optionally, the chromium and tungsten content in the roller blank is 40%-55% in total; and / or, the nickel content in the protective layer is 15%-25%, and the chromium content is 75%-85%; and / or, the spray layer is made of a chromium carbide alloy material, wherein the chromium carbide content is 80%-90%.

[0009] Optionally, the thickness of the protective layer is 0.1 mm-0.15 mm; and / or the thickness of the spray layer is 0.1 mm-0.15 mm.

[0010] Optionally, the calendering roller further comprises two water inlets, a water cooling cavity for supplying cooling water is arranged in the roller blank, the two water inlets are arranged at two ends of the roller blank opposite to each other, and are both connected to the roller blank and communicated with the water cooling cavity.

[0011] Optionally, the water connection head is provided with a water hole, the water hole is connected with the water cooling cavity, and the radius of the water hole is equal to 30%-40% of the radius of the water cooling cavity.

[0012] Optionally, a plurality of partition walls are arranged in the water-cooling cavity, the plurality of partition walls are arranged at intervals and are all arranged on the inner wall of the roller blank, the partition walls protrude from the inner wall of the roller blank, and a diversion channel is formed between two adjacent partition walls, and the diversion channel is used to guide the cooling water.

[0013] Optionally, the water receiving head is provided with a plurality of drainage grooves, the plurality of drainage grooves are arranged at intervals, and the positions of the drainage grooves are arranged in a one-to-one correspondence with the positions of the diversion channels.

[0014] Optionally, the branch channel is arranged in a straight line or a spiral shape.

[0015] Optionally, the calendering roller further includes a flow meter installed on the water receiving head, and the flow meter is used to detect the flow of cooling water; and / or, the calendering roller further includes a thermometer installed on the water receiving head, and the flow meter is used to detect the temperature of cooling water.

[0016] A method for producing a calendering roller is used to produce the above-mentioned calendering roller, and the method for producing the calendering roller comprises: performing supersonic flame spraying on the roller blank to form a protective layer outside the circumference of the roller blank; performing supersonic flame spraying on the roller blank provided with the protective layer to form a spray layer outside the protective layer; and performing coarse grinding and fine grinding on the spray layer.

[0017] Optionally, before the step of spraying the roller blank to form a protective layer on the outer circumference of the roller blank, the production method of the calendering roller also includes: preparing a blank; boring the blank, rough grinding in the hole and fine grinding in the hole to obtain a roller blank with a water-cooled cavity.

[0018] The calendering roller and the production method thereof provided by the present invention have the following beneficial effects:

[0019] The calendering roller provided by the present invention has a protective layer and a spray layer sequentially arranged outside the circumference of the roller blank, the roller blank is made of a chromium-tungsten alloy material, the protective layer is made of a nickel-chromium alloy material, the spray layer is made of a chromium carbide alloy, aluminum oxide or tungsten carbide material, the spray layer is used to contact with the glass melt, and the protective layer is used to increase the bonding force between the roller blank and the spray layer. Compared with the prior art, the calendering roller provided by the present invention has better anti-oxidation performance and higher bonding strength due to the use of the protective layer and the spray layer arranged outside the circumference of the roller blank, which can effectively avoid the oxidation and shedding of the coating, prolong the service life, and ensure the calendering effect and product quality.

[0020] The calendering roller production method provided by the present invention has good anti-oxidation performance and high bonding strength, can effectively avoid the oxidation and shedding of the coating, extend the service life, and ensure the calendering effect and product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 A schematic diagram of the structure of a calendering roller provided in an embodiment of the present invention;

[0023] Figure 2 A schematic diagram of the structure of a calender roller provided in an embodiment of the present invention when there are six branch channels;

[0024] Figure 3 A schematic diagram of the structure of a calender roller provided in an embodiment of the present invention when the number of the calender rollers is eight;

[0025] Figure 4 A schematic diagram of the structure of a calender roller provided in an embodiment of the present invention when there are four branch channels;

[0026] Figure 5 This is a comparison chart of the combined effect;

[0027] Figure 6 This is a comparison chart of the process effects of the calendering roller bonding layer of glass-ceramics;

[0028] Figure 7 This is a comparison chart of calendering roller coating processes.

[0029] Icons: 100-calendering roller; 110-roller blank; 111-water-cooling cavity; 112-partition wall; 113-diverter; 120-protective layer; 130-spray layer; 140-water inlet; 141-water hole; 142-drainage trough; 143-block; 150-flow meter; 160-thermometer. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0033] In the description of the present invention, it should be noted that the terms "inside", "outside", "upper", "lower", "horizontal", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the product of the invention is usually placed when in use, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0034] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "connect", "install", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the features of the following embodiments can be combined with each other.

[0036] Please refer to Figures 1 to 4 The embodiment of the present invention provides a calendering roller 100 for calendering a glass melt. The calendering roller 100 has good anti-oxidation performance and high bonding strength, can effectively prevent oxidation and shedding of the coating, prolong service life, and ensure calendering effect and product quality.

[0037] It should be noted that the calendering roller 100 is applied to a calendering machine (not shown), and there are two calendering rollers 100, which are arranged in parallel and spaced apart to form a calendering pair of rollers, and a gap between the two calendering rollers 100 is formed. In the production process of microcrystalline glass, the feed channel feeds the glass melt into the calendering pair of rollers in a waterfall shape to form a material beach in the gap between the rollers, and the calendering pair of rollers is used to extrude and cool the glass melt to form microcrystalline glass.

[0038] The calendering roller 100 includes a roller blank 110, a protective layer 120 and a spray layer 130. The protective layer 120 and the spray layer 130 are sequentially arranged outside the circumference of the roller blank 110, that is, the protective layer 120 is arranged between the roller blank 110 and the spray layer 130. The roller blank 110 is in the shape of an elongated cylinder, and the protective layer 120 and the spray layer 130 are both in the shape of thin cylinders. Among them, the roller blank 110 is the main structure of the calendering roller 100, which can rotate under the action of an external force to realize the calendering function of the glass melt; the spray layer 130 is used to directly contact the glass melt, and it has good anti-oxidation performance and can slow down the oxidation process; the protective layer 120 is used to increase the bonding force between the roller blank 110 and the spray layer 130, so as to improve the bonding strength of the entire calendering roller 100 and prevent the spray layer 130 from falling off. Specifically, the protective layer 120 and the spray layer 130 work together to effectively prevent the coating from being oxidized and peeled off, thereby extending the service life of the calendering roller 100 and ensuring the calendering effect and product quality.

[0039] Furthermore, the roller blank 110 is made of a chromium-tungsten alloy material, the protective layer 120 is made of a nickel-chromium alloy material, and the sprayed layer 130 is made of a chromium carbide alloy, alumina or tungsten carbide material. Reasonable materials of the roller blank 110, the protective layer 120 and the sprayed layer 130 can improve the oxidation resistance and bonding strength of the calendering roller 100 as much as possible while ensuring the hardness of the calendering roller 100, effectively avoid oxidation and shedding of the coating, and extend the service life of the calendering roller 100.

[0040] Preferably, the material of the roller blank 110 is 1Cr12WMoV, and the chromium and tungsten content of the roller blank 110 is 40%-55%. Since the working environment temperature of the calendering roller 100 is high and it is easy to be oxidized and corroded, the traditional ceramic material cannot be used to make the roller blank 110, and the chromium-tungsten alloy has high hardness and good oxidation resistance, corrosion resistance and high temperature resistance, among which 1Cr12WMoV has more excellent corrosion resistance and high temperature resistance. Therefore, 1Cr12WMoV is selected as the roller blank 110 of the calendering roller 100 to realize the function of calendering the glass melt.

[0041] Preferably, the material of the protective layer 120 is Cr20Ni80, and the nickel content in the protective layer 120 is 15%-25%, and the chromium content is 75%-85%. For example, the nickel-chromium content ratio can be 75%:25%, 80%:20%, 85%:15%, etc. Chromium and nickel both have good mechanical properties, physical properties and chemical properties. Adding appropriate elements can improve their oxidation resistance, corrosion resistance, high temperature strength and improve certain physical properties. Selecting Cr20Ni80 as the protective layer 120 of the calendering roller 100 can increase the bonding force between the roller blank 110 and the spray layer 130, prevent the spray layer 130 from cracking during the calendering process, and can play a role in buffering the thermal conductivity of the roller blank 110 and the spray layer 130 (the thermal conductivity coefficients of the roller blank 110 and the spray layer 130 are different, and a medium is required for buffering), thereby ensuring the thermal conductivity effect. Specifically, the thickness of the protective layer 120 is 0.1mm-0.15mm.

[0042] Preferably, the sprayed layer 130 is made of a chromium carbide alloy material, wherein chromium carbide (Cr 2 C 3 ) content is 80%-90%. 2 C 3 The content of Cr is controlled at 80%-90%, which can make the hardness and oxidation resistance of the spray layer 130 stronger. 2 C 3 It is off-white, has an orthorhombic crystal structure, Cr 2 C 3 The relative density is 6.68g / cm 3 The melting point is 1890℃, the boiling point is 3800℃, and its microhardness is very high, reaching 2700kg / mm 2 Cr 2 C 3 It is insoluble in water, can effectively resist the erosion of acid and alkali, and has excellent high temperature stability, wear resistance and corrosion resistance. Specifically, the thickness of the spray layer 130 is 0.1mm-0.15mm.

[0043] It is worth noting that the use of 1Cr12Wmov with high temperature resistance, corrosion resistance and high rigidity as the roller blank 110 can improve the structural strength and service life of the calendering roller 100. 2 C 3 The spray coating 130 can make the surface of the calendering roller 100 have physical characteristics such as high hardness and high temperature resistance. The use of Cr20Ni80 with excellent physical and chemical properties as the protective layer 120 can increase the bonding force between the roller blank 110 and the spray coating 130, prevent the spray coating 130 from cracking during the calendering process, and play a role in buffering the thermal conductivity of the roller blank 110 and the spray coating 130, so that the roller blank 110 and the spray coating 130 can be better used in combination.

[0044] Specifically, 1Cr12Wmov, Cr20Ni80 and Cr 2 C 3 The melting points of 1Cr12Wmov are all above 1100℃, and the melting point of 1Cr12Wmov is lower than that of Cr20Ni80, and the melting point of Cr20Ni80 is lower than that of Cr 2 C 3 The melting points of the roller blank 110, the protective layer 120 and the sprayed layer 130 gradually increase, and the melting point of the entire calendering roller 100 gradually increases from the inside to the outside, which meets the production conditions of microcrystalline glass. 2 C 3 All three materials contain Cr and have similar densities (6.5-8.5g / cm 3 The molecular bonding force of the three is strong, the component compatibility is also high, and they have high bonding strength. 1Cr12Wmov, Cr20Ni80 and Cr 2 C 3 The thermal conductivity of the three materials gradually decreases, that is, the thermal conductivity of the entire calendering roller 100 gradually decreases from the inside to the outside, which can effectively reduce the oxidation effect of high temperature on the calendering roller 100 and increase the service life of the calendering roller 100. 2 C 3 The metallographic structure of 1Cr12Ni80 is martensite, which is lath-shaped and needle-shaped under the microscope, with a body-centered square structure. The compatibility between the two is not high, but the metallographic structure of Cr20Ni80 is austenite, which is equiaxed polygonal grains under the microscope, with a face-centered cubic structure. Austenite has good plasticity, and the transformation of austenite to martensite requires only a small amount of energy. This transformation is a diffusion-free displacement type, which is only a rapid and small atomic rearrangement. Therefore, Cr20Ni80 can be used as 1Cr12Wmov and Cr 2 C 3 The bonding material between them has a good bonding effect and can effectively improve the bonding strength.

[0045] Please refer to Figure 5 , further, according to Figure 5 (Combined with the effect comparison chart) it can be seen that when Cr20Ni80 is used as the protective layer 120, 1Cr12Wmov (roller blank 110) and Cr 2 C 3 The calendering roller 100 obtained by combining (the spray layer 130) is more suitable for calendering microcrystalline glass, and the microcrystalline glass formed by calendering has a higher yield rate.

[0046] Please refer to Figure 6 , further, according to Figure 6 (Comparison of process effects of microcrystalline glass calendering roller bonding layer) It can be seen that compared with other bonding methods of calendering roller 100, the roller blank 110 (1Cr12Wmov), protective layer 120 (Cr20Ni80) and spray layer 130 (Cr 2 C 3 ) combined with the calendering roller 100 has higher high temperature resistance, roller surface hardness and material bonding strength, longer service life, lighter roller surface oxidation, smaller surface roughness, shorter processing cycle and higher economic benefits.

[0047] Please continue to refer to Figures 2 to 4 Preferably, the calendering roller 100 further includes two water connection heads 140. A water-cooling cavity 111 for supplying cooling water is provided in the roller blank 110, and the cooling water is used to cool the roller blank 110 to realize the calendering molding of the glass melt. Specifically, the two water connection heads 140 are relatively arranged at the two ends of the roller blank 110, and are both connected to the roller blank 110, and are both connected to the water-cooling cavity 111, wherein one water connection head 140 is used for an external water inlet pipe, and the other water connection head 140 is used for an external water outlet pipe, and the cooling water can be passed into the water-cooling cavity 111 through the water inlet pipe, and the cooling water in the water-cooling cavity 111 can be discharged through the water outlet pipe, and the two water connection heads 140 work together to realize the circulation of cooling water, thereby realizing the continuous cooling function.

[0048] Furthermore, the water inlet 140 is made of stainless steel or chromium-nickel alloy. A reasonable material of the water inlet 140 can facilitate processing and installation, and is not easily oxidized in a high temperature environment. Specifically, the water inlet 140 is welded to the end surface of the roll blank 110 by sealed welding to improve the connection strength and sealing of the water inlet 140 and the roll blank 110, and prevent the cooling water from leaking.

[0049] Specifically, the water connection head 140 is provided with a water hole 141, which is connected to the water cooling cavity 111, and the water hole 141 is used for cooling water to pass through, so as to achieve the entry or discharge of cooling water. In this embodiment, the radius of the water hole 141 is equal to 30%-40% of the radius of the water cooling cavity 111, for example, it can be set to 31%, 32%, 33%, 34%, 35%, 36%, 37%, etc. A reasonable ratio between the radius of the water hole 141 and the radius of the water cooling cavity 111 can ensure that the water intake and drainage of the cooling water meet the use requirements of the water cooling cavity 111, and ensure that the cooling water in the water cooling cavity 111 can evenly cool the roll blank 110.

[0050] Preferably, a plurality of partition walls 112 are arranged in the water-cooling cavity 111, and the plurality of partition walls 112 are evenly arranged and are all arranged on the inner wall of the roller blank 110, and the partition walls 112 protrude from the inner wall of the roller blank 110, and a diversion channel 113 is formed between two adjacent partition walls 112, and the diversion channel 113 is used to guide the cooling water so that the cooling water can flow stably and evenly to prevent turbulence. Specifically, the plurality of diversion channels 113 work together to ensure that the cooling water in the water-cooling cavity 111 can evenly act on the roller blank 110, thereby more evenly affecting the surface of the calendering roller 100, thereby improving the surface quality of the microcrystalline glass.

[0051] Furthermore, the flow channel 113 is arranged in a straight line or in a spiral shape. When the flow channel 113 is arranged in a straight line, the cooling water in the water-cooling cavity 111 flows along the axial direction of the calendering roller 100; when the flow channel 113 is arranged in a spiral shape, the cooling water in the water-cooling cavity 111 flows in a circumferential spiral around the calendering roller 100; both cooling water flow modes can ensure the stability of the cooling water flow and the uniformity of the cooling of the roll blank 110, and the cooling effect is good.

[0052] In this embodiment, the partition wall 112 and the roller blank 110 are integrally formed to improve the connection strength, and no gap is formed between the two. However, this is not limited to this. In other embodiments, the partition wall 112 and the roller blank 110 can also be separately provided, and the partition wall 112 is connected to the roller blank 110 by sealing welding or welding, which also has high connection strength and sealing performance.

[0053] Preferably, the water receiving head 140 is provided with a plurality of drainage grooves 142, and the plurality of drainage grooves 142 are arranged at intervals, and the positions of the drainage grooves 142 are arranged one-to-one with the positions of the diverter 113, that is, the position of each drainage groove 142 corresponds to the position of a diverter 113, and each drainage groove 142 can divert part of the cooling water to a diverter 113, or the cooling water in each diverter 113 can be discharged outward through a drainage groove 142, and the water receiving head 140 and the roller blank 110 are used in combination to ensure the diversion effect, avoid turbulence, and enhance the cooling uniformity of the cooling water. Specifically, the cross-section of the drainage groove 142 is crescent-shaped. Under the action of the drainage groove 142, the cooling water flowing in from the middle of the water receiving head 140 gradually decreases in cross-sectional area during the process of radially diffusing outward along the water receiving head 140, thereby improving the stability of the cooling water flowing from the drainage groove 142 to the diverter 113, avoiding turbulence, and ensuring the drainage effect of the cooling water.

[0054] Further, a plurality of blocks 143 are provided on the inner wall of the water hole 141 of the water receiving head 140, and the plurality of blocks 143 are all provided in the water hole 141, and a drainage groove 142 is formed between two adjacent blocks 143. Specifically, the number of the partition wall 112, the diverter channel 113, the drainage groove 142 and the block 143 is the same, but the number of the partition wall 112, the diverter channel 113, the drainage groove 142 and the block 143 is not specifically limited.

[0055] Please refer to Figure 2 In a specific embodiment, the number of partition walls 112, diversion channels 113, drainage grooves 142 and blocks 143 are all six, the positions of the six drainage grooves 142 and the six diversion channels 113 correspond one to one, and the diversion channels 113 are arranged in a straight line. At this time, the cooling water in the water-cooling cavity 111 flows along the axial direction of the calendering roller 100.

[0056] Please refer to Figure 3 In another specific embodiment, the number of partition walls 112, diversion channels 113, drainage grooves 142 and blocks 143 are eight, the positions of the eight drainage grooves 142 and the eight diversion channels 113 correspond one to one, and the diversion channels 113 are arranged in a straight line. At this time, the cooling water in the water-cooling cavity 111 flows along the axial direction of the calendering roller 100.

[0057] Please refer to Figure 4 In another specific embodiment, the number of partition walls 112, diversion channels 113, drainage grooves 142 and blocks 143 are all four, the positions of the four drainage grooves 142 and the four diversion channels 113 correspond one to one, and the diversion channels 113 are arranged in a spiral shape. At this time, the cooling water in the water-cooling cavity 111 flows in a circumferential spiral around the calendering roller 100.

[0058] Please continue to refer to Figure 1 and Figure 2Preferably, the calendering roller 100 further includes a flow meter 150. The flow meter 150 is installed on the water receiving head 140, and the flow meter 150 is used to detect the flow of cooling water, so as to control the circulation flow of cooling water, ensure the cooling effect of the calendering roller 100, avoid the occurrence of cold cracks, stripes and other board surface defects of the microcrystalline glass, and improve product quality.

[0059] Preferably, the calendering roller 100 further includes a thermometer 160. The thermometer 160 is installed on the water inlet 140, and the flow meter 150 is used to detect the temperature of the cooling water, so as to control the circulating temperature of the cooling water, prevent the glass melt from sticking to the roller due to excessively high water temperature, and prevent the microcrystalline glass from cold cracking due to excessively low water temperature, so as to ensure product quality.

[0060] The embodiment of the present invention further provides a method for producing a calendering roller, which is used to produce the calendering roller 100. The method for producing the calendering roller comprises the following steps:

[0061] Step S110: preparing a green body.

[0062] It should be noted that, in step S110, solid steel (made of 1Cr12WMoV) is made into a long cylindrical shape, and its circumferential surface and end surface are polished smooth to form a blank.

[0063] Step S120 : boring, rough grinding and fine grinding are performed on the blank to obtain a roller blank 110 having a water-cooled cavity 111 .

[0064] It should be noted that in step S120, the inner hole of the blank is first bored out by a machine tool, and the shape of multiple branch channels 113 is processed to form a water-cooled cavity 111 and multiple partition walls 112 in the water-cooled cavity 111; then the inner hole of the blank is roughly ground with a grinding amount of approximately 0.01 mm to reduce the roughness of the side wall of the inner hole and improve the smoothness of the side wall of the inner hole; then the inner hole of the blank is finely ground with a grinding amount of approximately 0.01 mm to further improve the smoothness of the side wall of the inner hole, and a roller blank 110 is obtained, which has a water-cooled cavity 111 and multiple partition walls 112.

[0065] Step S130 : performing supersonic flame spraying on the roll blank 110 to form a protective layer 120 outside the circumference of the roll blank 110 .

[0066] It should be noted that in step S130, the roller blank 110 is sprayed by a supersonic flame spraying process, and the Cr20Ni80 material is sprayed to the outside of the circumference of the roller blank 110 to form a protective layer 120. Specifically, the working principle of supersonic flame spraying is that the liquid (such as kerosene) entering the combustion chamber through the small hole is atomized and mixed with oxygen to ignite, and a strong gas phase reaction occurs. The heat energy released by the combustion causes the product to expand violently and form an expansion gas. When the expansion gas flows through the nozzle, it is constrained by the nozzle to form a supersonic high-temperature flame flow. This flame flow heats and accelerates the spraying material (Cr20Ni80) so that the spraying material is sprayed to the outside of the circumference of the roller blank 110 to form a high-quality coating (protective layer 120). Compared with the electroplating process and chemical plating process in the prior art, the coating formed by the supersonic flame spraying process has stronger comprehensive performance, which can make the coating have better bonding, oxidation resistance, wear resistance, high temperature resistance, heat insulation and higher hardness.

[0067] Please refer to Figure 7 , further, according to Figure 7 (Comparison chart of calendering roller coating processes) It can be seen that compared with the coatings obtained by electroplating and chemical plating processes, the coatings obtained by spraying have higher high temperature resistance, roller surface hardness and material bonding strength, longer service life, lighter roller surface oxidation, smaller surface roughness, shorter processing cycle and higher economic benefits.

[0068] Step S140 : performing supersonic flame spraying on the roller blank 110 provided with the protective layer 120 to form a sprayed layer 130 outside the protective layer 120 .

[0069] It should be noted that in step S140, the roller blank 110 is sprayed with the supersonic flame spraying process to form Cr 2 C 3 The material is sprayed outside the protective layer 120 to form a sprayed layer 130 outside the protective layer 120 .

[0070] Furthermore, due to the protective layer 120 (Cr20Ni80) and the sprayed layer 130 (Cr 2 C 3 ) are formed by supersonic flame spraying process, so the molecular bonding force will be effectively strengthened, thereby further improving the bonding strength of the roller blank 110, the protective layer 120 and the spray layer 130, and preventing the spray layer 130 from cracking during the calendering process.

[0071] Step S150: performing rough grinding and fine grinding on the sprayed layer 130 .

[0072] It should be noted that, in step S150, the surface of the spray layer 130 is firstly rough-ground with a grinding amount of approximately 0.01 mm to improve the smoothness of the spray layer 130 and reduce the surface roughness of the calendering roller 100; then the surface of the spray layer 130 is fine-ground with a grinding amount of approximately 0.01 mm to further reduce the surface roughness of the calendering roller 100 and ensure that the material beach in the gap between the two rollers is evenly distributed, thereby ensuring the calendering effect on the glass melt.

[0073] Step S160 : sealingly welding two water receiving heads 140 to the two ends of the roller blank 110 , and installing the flow meter 150 and the thermometer 160 on the water receiving heads 140 .

[0074] It should be noted that in step S160, the water receiving head 140 is first welded to the end face of the roller blank 110 by a sealing welding method to improve the connection strength and sealing of the water receiving head 140 and the roller blank 110 to prevent the cooling water from leaking; then the flow meter 150 and the thermometer 160 are installed on the water receiving head 140 to detect the cooling water flow and temperature, so as to facilitate the adjustment of the circulation flow and circulation temperature of the cooling water and ensure the cooling effect.

[0075] The calendering roller 100 provided in the embodiment of the present invention has a protective layer 120 and a spray layer 130 sequentially arranged outside the circumference of the roller blank 110, the roller blank 110 is made of a chromium-tungsten alloy material, the protective layer 120 is made of a nickel-chromium alloy material, the spray layer 130 is made of a chromium carbide alloy, alumina or tungsten carbide material, the spray layer 130 is used to contact with the glass melt, and the protective layer 120 is used to increase the bonding force between the roller blank 110 and the spray layer 130. Compared with the prior art, the calendering roller 100 provided by the present invention has better anti-oxidation performance and higher bonding strength due to the use of the protective layer 120 and the spray layer 130 arranged outside the circumference of the roller blank 110, which can effectively avoid the oxidation and shedding of the coating, prolong the service life, and ensure the calendering effect and product quality. The production method of the calendering roller is simple, and the calendering roller 100 produced has a small roughness.

[0076] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A calendering roller, characterized in that: It includes a roller blank, a protective layer and a sprayed layer, wherein the protective layer and the sprayed layer are sequentially arranged outside the circumference of the roller blank, the roller blank is made of a chromium-tungsten alloy material, the protective layer is made of a nickel-chromium alloy material, the sprayed layer is made of a chromium carbide alloy, alumina or tungsten carbide material, the sprayed layer is used to contact with the glass melt, and the protective layer is used to increase the bonding force between the roller blank and the sprayed layer.

2. The calendering roller according to claim 1, characterized in that: The chromium and tungsten content of the roller blank is 40%-55% in total; and / or, the nickel content of the protective layer is 15%-25%, and the chromium content is 75%-85%; and / or, the spray layer is made of chromium carbide alloy material, wherein the chromium carbide content is 80%-90%.

3. The calendering roller according to claim 1, characterized in that: The thickness of the protective layer is 0.1 mm-0.15 mm; and / or the thickness of the spray layer is 0.1 mm-0.15 mm.

4. The calendering roller according to claim 1, characterized in that: The calendering roller also includes two water inlets. A water-cooling cavity for supplying cooling water is provided in the roller blank. The two water inlets are relatively arranged at the two ends of the roller blank, and are both connected to the roller blank and communicated with the water-cooling cavity.

5. The calendering roller according to claim 4, characterized in that: The water connection head is provided with a water hole, the water hole is communicated with the water cooling cavity, and the radius of the water hole is equal to 30%-40% of the radius of the water cooling cavity.

6. The calendering roller according to claim 4, characterized in that: A plurality of partition walls are arranged in the water-cooling cavity, the plurality of partition walls are arranged at intervals and are all arranged on the inner wall of the roller blank, the partition walls protrude from the inner wall of the roller blank, and a diversion channel is formed between two adjacent partition walls, and the diversion channel is used to guide cooling water.

7. The calendering roller according to claim 6, characterized in that: The water receiving head is provided with a plurality of drainage grooves, the plurality of drainage grooves are arranged at intervals, and the positions of the drainage grooves are arranged in a one-to-one correspondence with the positions of the diversion channels.

8. The calendering roller according to claim 6, characterized in that: The branch channel is arranged in a straight line or a spiral shape.

9. The calendering roller according to claim 4, characterized in that: The calendering roller further comprises a flow meter, which is installed on the water receiving head and is used to detect the flow of cooling water; And / or, the calendering roller further comprises a thermometer, the thermometer is mounted on the water receiving head, and the flow meter is used to detect the temperature of the cooling water.

10. A method for producing a calender roller, characterized in that: Used to produce the calendering roller according to any one of claims 1 to 9, the production method of the calendering roller comprising: Performing supersonic flame spraying on the roller blank to form the protective layer outside the circumference of the roller blank; Performing supersonic flame spraying on the roller blank provided with the protective layer to form the sprayed layer outside the protective layer; The sprayed layer is subjected to coarse grinding and fine grinding.

11. The method for producing a calender roller according to claim 10, characterized in that: Before the step of spraying the roller blank to form the protective layer outside the circumference of the roller blank, the production method of the calendering roller further includes: preparing a green body; The blank is subjected to boring, rough grinding in the hole and fine grinding in the hole to obtain the roller blank with a water-cooled cavity.

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