A method for preventing sticking of a titanium material rolling roller
By spraying surface isolation powder online, the problem of roller sticking during titanium rolling was solved, resulting in extended roll life, improved production efficiency and surface quality, reduced friction coefficient inconsistency, and fewer steel pile-up accidents.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
- Filing Date
- 2022-12-16
- Publication Date
- 2026-07-07
AI Technical Summary
Titanium materials tend to stick together during the rolling process, which leads to a shortened roll life, low production efficiency, poor surface quality, and inconsistent friction coefficients that affect the yield.
During the rolling process, surface isolation powder is sprayed online. The isolation powder particles are implanted into the surface of the titanium material by high-pressure air, forming an implantable adhesion to isolate the rolled workpiece and the roll, thereby reducing the coefficient of friction.
It effectively prevents titanium materials from sticking to the rolls, extends the service life of the rolls, improves production efficiency, improves surface quality, reduces friction coefficient consistency, and reduces steel accumulation accidents.
Smart Images
Figure CN115958074B_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of non-ferrous metal material manufacturing technology, and particularly relates to a method for rolling anti-sticking rolls of titanium materials. Background Technology
[0002] Normally, all metals will inevitably stick to some extent under friction. Hot rolling sticking refers to the phenomenon during hot rolling production where certain parts of the rolled material surface peel off into fragments and adhere to the work roll surface, damaging both the roll surface and the surface quality of the rolled material. Sticking shortens roll changeover time, reduces production efficiency, and deteriorates the surface quality of the rolled material. The change in the coefficient of friction between the rolled material and the work roll after sticking increases the rolling force, leading to deviations in strip shape control.
[0003] Compared to other metals, the interfacial adhesion energy between Ti and Fe is greater than the internal bonding energy of each metal. Therefore, when the Fe and Ti surfaces are in close contact and undergo relative movement, fracture will occur in the deeper layers of the Ti matrix, causing surface scratches on the titanium material. Titanium and its alloys are prone to adhesion during plastic deformation and machining, mainly manifested as sticking to the cutting tool during cutting, sticking to the grinding wheel during forging, and sticking to the rolls during rolling. Titanium has a tendency to stick compared to other metals; generally, all metals will exhibit some degree of adhesion under frictional conditions. Furthermore, for some titanium alloys with coarse initial microstructures, rolling at higher temperatures is required to prevent cracking, which exacerbates the adhesion phenomenon.
[0004] For most rolled metals, adhesion can be minimized by appropriately selecting the type of lubricant and the metal in contact with it. However, for titanium alloys, which are prone to adhesion, the above-mentioned anti-adhesion measures are quite limited. Adhesion to the rolls shortens the roll life, results in poor surface quality of bars and wires, causes unnecessary energy waste, and leads to low production efficiency.
[0005] In addition, for steel-titanium joint production enterprises, adhesion can also lead to a greater difference in the coefficient of friction between steel and titanium and the rolls during rolling, resulting in significant differences in width and making it more difficult to adjust the material shape. This can easily lead to steel piling accidents caused by improper adjustment, which in turn affects the yield.
[0006] Therefore, it is necessary to provide a method for rolling anti-sticking rolls of titanium materials to increase the service life of the rolls, improve the surface quality of bars and wires, increase production efficiency, and at the same time adjust the surface friction state of different grades to make the friction coefficient basically consistent, so that the width of the rolled pieces is as close as possible, reduce the adjustment during the grade switching process, and reduce the risk of steel stacking accidents. Summary of the Invention
[0007] In order to overcome the defects of the prior art, the present invention aims to provide a method and apparatus for rolling anti-sticking rolls of titanium materials. By adding online surface treatment during the rolling process, the surface quality of titanium materials is improved, the service life of the rolls is extended, and the coefficient of friction between the rolls and titanium is reduced.
[0008] To achieve the above objectives, the present invention provides the following technical solution:
[0009] A method for rolling anti-sticking rolls from titanium materials includes the following steps:
[0010] Preparation of surface isolation powder;
[0011] Heating titanium billets;
[0012] Surface isolation powder is implanted by online sandblasting on the rolled surface of heated titanium billet;
[0013] The product is obtained by rolling titanium billets with embedded surface isolation powder. For multi-pass rolling, the rolling surface needs to be sandblasted and implanted with isolation powder before each pass.
[0014] Furthermore, titanium materials include industrial pure titanium and titanium alloys.
[0015] Further, the surface isolating powder is prepared, including:
[0016] Large particles of river sand for construction are removed by using a 40-mesh sieve to obtain coarse sand;
[0017] The coarse sand is crushed using a two-roll mill, and the fine particles in the crushed coarse sand are removed by sieving with an 80-mesh sieve to obtain fine sand with sharp edges.
[0018] The fine sand and adhesive are mixed evenly and heated and kept at a constant temperature to obtain a mixture;
[0019] The mixture is crushed and rolled using a two-roll mill to obtain the broken surface isolation powder.
[0020] Furthermore, the coarse sand is compacted using a two-roll mill, including:
[0021] Set the roll gap of the two-roll mill to 0.15mm.
[0022] Furthermore, the adhesive is a mixture of MgCl2, NaCl and KCl.
[0023] Furthermore, the mass ratio of MgCl2, NaCl, and KCl is 5:3:2.
[0024] Further, the fine sand and adhesive are mixed evenly and heated and kept at a constant temperature, including:
[0025] The heating temperature was controlled at 700℃ and held for 4 hours before being cooled with the furnace.
[0026] Further, the mixture is crushed and rolled through a two-roll mill, including:
[0027] Set the roll gap of the two-roll mill to 0.15mm.
[0028] Furthermore, surface isolation powder is implanted by online sandblasting on the rolled surface of the heated titanium billet, including:
[0029] The surface isolation powder, after being broken, is injected into the titanium blank with compressed air using a sandblasting device, forming an implantable adhesion on the surface of the titanium blank.
[0030] Furthermore, the nozzles of the sandblasting equipment are positioned directly opposite the contact surface between the titanium billet and the roll. The position and number of the nozzles are determined by the direction and number of the contact surfaces between the titanium billet and the roll.
[0031] The technical effects and advantages of this invention are as follows:
[0032] This invention involves inserting online surface treatment into the hot rolling process, using high-pressure air and isolation powder particles jets to be directed at high-temperature rolled parts at high speed to form an implantable adhesion, which can effectively isolate the surface of the rolled parts from the rolls and prevent sticking and falling off.
[0033] This invention increases the bonding force between lubricating graphite and the surface of the coil during hot rolling by spraying isolation powder particles onto the surface of the rolled workpiece to form an implantable adhesion, thus creating better conditions for drawing.
[0034] This invention discloses a method for preparing isolation powder for online surface treatment, which can effectively form an implantable adhesion on the surface of high-temperature rolled parts and has a good isolation effect.
[0035] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures pointed out in the description, claims and drawings. Attached Figure Description
[0036] Figure 1 This is a flowchart of a method for rolling anti-sticking rolls of titanium material according to the present invention;
[0037] Figure 2 This is a schematic diagram of the nozzle arrangement of the sandblasting equipment in Example 1;
[0038] Figure 3 The 180mm industrial pure titanium TA1 square billet before surface treatment in Example 1;
[0039] Figure 4 The 180mm industrial pure titanium TA1 square billet after surface treatment in Example 1;
[0040] Figure 5 The billet obtained by rolling in the high-temperature β-phase region without surface treatment in Example 1;
[0041] Figure 6 This is a schematic diagram of the nozzle arrangement of the sandblasting equipment in Example 2;
[0042] Figure 7 The φ10.0mm titanium alloy TC4 blank before surface treatment in Example 2;
[0043] Figure 8 The φ10.0mm titanium alloy TC4 billet after surface treatment in Example 2. Detailed Implementation
[0044] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0045] Figure 1 This is a flowchart of a method for rolling anti-sticking rolls of titanium materials according to the present invention, as shown below. Figure 1 As shown, the present invention provides a method for rolling anti-sticking rolls from titanium materials, comprising:
[0046] Preparation of surface isolation powder;
[0047] Heating titanium billets;
[0048] The surface isolation powder is implanted by sandblasting the surface of the heated titanium blank.
[0049] The titanium blank with implanted surface insulating powder is rolled.
[0050] The product is obtained by repeatedly performing the steps of implanting isolation powder and rolling.
[0051] Furthermore, titanium materials include industrial pure titanium and titanium alloys.
[0052] Furthermore, in preparing the surface isolation powder, a 40-mesh sieve is used to remove coarse particles of river sand used in construction, resulting in coarse sand. This coarse sand is then crushed using a two-roll mill. An 80-mesh sieve is used to remove fine particles from the crushed coarse sand, resulting in angular fine sand. The fine sand is then mixed evenly with an adhesive and heated to obtain a mixture. Finally, the mixture is crushed and crushed using a two-roll mill to obtain the broken surface isolation powder. When crushing the coarse sand using a two-roll mill, the roller gap is set to 0.15 mm.
[0053] Furthermore, the adhesive is a mixture of MgCl2, NaCl and KCl, with a mass ratio of 5:3:2.
[0054] Furthermore, when the fine sand and adhesive are mixed evenly and heated and kept at a constant temperature, the heating temperature is controlled at 700℃ and kept at that temperature for 4 hours before being cooled with the furnace.
[0055] Furthermore, when crushing the mixture and rolling it with a two-roll mill, the roll gap of the two-roll mill is set to 0.15 mm.
[0056] Furthermore, when sandblasting the surface isolation powder onto the titanium billet surface, a sandblasting device is used to propel the crushed isolation powder onto the titanium billet with compressed air, forming an implantable adhesion on the titanium billet surface. The nozzle of the sandblasting device is positioned directly opposite the contact surface between the titanium billet and the rolling mill rolls. The location and number of sandblasting devices are determined by the direction and number of the contact surfaces between the titanium billet and the rolling mill rolls.
[0057] Example 1
[0058] S1. Use a 40-mesh sieve to remove large particles of river sand for construction to obtain coarse sand. Then, use a two-roll mill to crush the coarse sand. Use an 80-mesh sieve to remove small particles from the crushed coarse sand to obtain fine sand with sharp edges. Then, mix the fine sand with a high-temperature adhesive evenly and heat it to obtain a mixture. Finally, crush the mixture and use a two-roll mill to crush it to obtain the broken isolation powder.
[0059] S2. 180mm industrial pure titanium TA1 square billet is prepared by rolling using an 825 reciprocating roughing mill. The mill consists of two rolls: the upper roll diameter is 870-760mm and the lower roll diameter is 880-770mm.
[0060] S3. Heat the titanium billet for rolling. The original titanium billet can be a casting or a forged billet.
[0061] S4. Using online sandblasting equipment, the crushed isolation powder is injected with compressed air onto the heated billet, forming an implantable adhesion on the billet surface. Figure 2 This is a schematic diagram of the nozzle arrangement of the sandblasting equipment in Example 1. Since the billet turning machine has steel turning function, the sandblasting equipment nozzles only need to be arranged in the vertical direction of the billet.
[0062] S5. The titanium billet with implanted surface isolation powder is reciprocated and rolled. After turning it over, the sandblasting and implantation steps of S3 are repeated to obtain a smaller titanium square billet.
[0063] Figure 3 For a 180mm industrial pure titanium TA1 square billet before surface treatment, such as Figure 3As shown, the surface of the billet has numerous pits and scabs larger than 1 cm. Figure 4 For a 180mm industrial pure titanium TA1 square billet after surface treatment, such as Figure 4 As shown, all pits and scabs larger than 1 cm on the surface of the billet have been eliminated. On the other hand, as... Figure 5 As shown, rolling an untreated billet in the high-temperature β-phase region will cause core cracking, while a surface-treated billet can be rolled in the high-temperature β-phase region without affecting the surface quality and eliminating core cracking.
[0064] Example 2
[0065] S1. Use a 40-mesh sieve to remove large particles of river sand for construction to obtain coarse sand. Then, use a two-roll mill to crush the coarse sand. Use an 80-mesh sieve to remove small particles from the crushed coarse sand to obtain fine sand with sharp edges. Then, mix the fine sand with a high-temperature adhesive evenly and heat it to obtain a mixture. Finally, crush the mixture and use a two-roll mill to crush it to obtain the broken isolation powder.
[0066] S2. φ10.0mm titanium alloy TC4 coil rolling is carried out using a hot continuous rolling mill. The hot continuous rolling mill consists of alternating horizontal and vertical rolling mill units.
[0067] S3. Heat the titanium alloy used for rolling.
[0068] S4. Using online sandblasting equipment, the crushed isolation powder is injected with compressed air onto the hot billet, forming an implantable adhesion on the surface of the hot billet. Figure 6 This is a schematic diagram of the nozzle arrangement of the sandblasting equipment in Example 2, as shown below. Figure 6 As shown, a typical continuous rolling mill consists of 6 rolling mills. To save costs, the nozzles of the sandblasting equipment are arranged in front of the first and second stands of each hot continuous rolling mill. Since the hot continuous rolling mill consists of alternating horizontal and vertical rolling mills, nozzles need to be arranged in both the vertical and horizontal directions of the billet. That is, if the rolls are arranged horizontally, the nozzles in front of them are arranged vertically, and if the rolls are arranged vertically, the nozzles in front of them are arranged horizontally. The number of nozzles in the direction of contact with the rolls can be increased according to the roll profile.
[0069] S5. Roll the blank containing the implanted surface isolation powder to obtain the product.
[0070] Figure 7 For a φ10.0mm titanium alloy TC4 blank before surface treatment, such as Figure 7 As shown, there is a large amount of sticky peeling on the surface of the billet. Figure 8 For a φ10.0mm titanium alloy TC4 billet after surface treatment, such as Figure 8 As shown, all the sticky peeling on the surface of the billet has been eliminated.
[0071] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
Claims
1. A method for rolling anti-sticking rolls from titanium materials, characterized in that, The method includes the following steps: To prepare surface isolation powder, coarse particles of river sand for construction were removed by sieving with a 40-mesh sieve to obtain coarse sand. The coarse sand is crushed using a two-roll mill, and the fine particles in the crushed coarse sand are removed by sieving with an 80-mesh sieve to obtain fine sand with sharp edges. The fine sand and adhesive are mixed evenly and heated and kept at a constant temperature to obtain a mixture; The mixture is crushed and rolled using a two-roll mill to obtain a crushed surface isolation powder. The adhesive is a mixture of MgCl2, NaCl and KCl, with a mass ratio of 5:3:
2. Heating titanium billets; The process of embedding the surface isolation powder into the rolled surface of the heated titanium billet by online sandblasting includes: using sandblasting equipment to shoot the crushed surface isolation powder onto the titanium billet with compressed air, thereby forming an implantable adhesion on the surface of the titanium billet; The product is obtained by rolling titanium billets with embedded surface isolation powder. For multi-pass rolling, the rolling surface needs to be sandblasted and embedded with surface isolation powder before each pass.
2. The method for rolling anti-sticking rolls of titanium material according to claim 1, characterized in that, The titanium material includes industrial pure titanium or titanium alloy.
3. The method for producing anti-sticking rolls for titanium materials according to claim 1, characterized in that, The process of using a two-roll mill to compact the coarse sand includes: Set the roll gap of the two-roll mill to 0.15mm.
4. The method for rolling anti-sticking rolls of titanium material according to claim 1, characterized in that, The process of mixing the fine sand and the adhesive evenly and then heating and maintaining the temperature includes: The heating temperature was controlled at 700℃ and held for 4 hours before being cooled with the furnace.
5. The method for producing anti-sticking rolls for titanium rolling according to claim 1, characterized in that, The process of crushing the mixture and then pressing it through a two-roll mill includes: Set the roll gap of the two-roll mill to 0.15mm.
6. The method for rolling anti-sticking rolls of titanium material according to claim 1, characterized in that, The nozzles of the sandblasting equipment are positioned directly opposite the contact surface between the titanium billet and the roll. The position and number of the nozzles are determined by the direction and number of the contact surfaces between the titanium billet and the roll.