235 0 obj <> endobj xref 235 32 0000000016 00000 n 0000004063 00000 n Academia.edu no longer supports Internet Explorer. 4 0 obj i.e. MFk t,:.FW8c1L&9aX: rbl1 0000145567 00000 n 0000007310 00000 n The marine rolling machine is mainly used for rolling the arc plate of the ship shell and pressing the groove bulkhead. Although there are many. Cavity Formation in Bar Cavity formation in a solid round bar and its utilization in the rotary. Of Mechanical Engineering AbhaGaikawadPatil Engineering College. /5@ab:|Q.Q1%5-0Ya^3QvY[aG|>H#lrW cmj}U@~X ]HP"F81jdqG|3hi3W* stream `a"6 '^@ZSgd`jq` S,L?!viF9 tk3H0(j i 2. 0000137972 00000 n %PDF-1.7 <>/Font<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 612 792] /Contents 5 0 R/Group<>/Tabs/S>> 0000159980 00000 n 0000133781 00000 n The structure of four roller plate bending rolls as shown in figure 1, it is mainly composed of low frame, overturn device, upper roller, lower roller, two side roller, high frame, connecting beam, base, balancing device, transmission device, electrical system, hydraulic system, etc. If too small, the motor will be overloaded for a long time which will damage the motor because of heat caused by insulation. 0000005592 00000 n 2 0 obj 2, the stress distribution of the plate section along the direction of steel plate height during the linear pure plastic bending is shown in FIG. . stream so please guide me the distance between two rollers( bottom) . [/ICCBased 3 0 R] I need help with the calculations and design of a plate bending machine for our personal use. %PDF-1.5 stream 0000007473 00000 n Ramesh Singh Notes by Dr. The machine consists of three rollers. 0000002286 00000 n 0000002276 00000 n /Filter /FlateDecode #Te` n; da,db,dcare the roller neck diameter of upper roller, lower roller and side roller separately. endobj The upper roller of 4 rolls bending machine is a driven roller. Ramesh Singh Notes by Dr. endobj 0000001464 00000 n Wn The work done by bending internal forces; Ww The work on the upper roller by external forces; L The bending Angle corresponds to the length of the plate. xref Load Analysis And Driven Power Calculation (Symmetrical 3 Roll Plate Bending Machine), The maximum width and thickness of rolled steel sheet (m), Plate Rolling Machine: The Ultimate Guide, Present Situation And Development of Roll Bending Machine in China, Load Analysis And Driven Power Calculation (4 Roll Bending Machine), Calculation of Side Roll Position Shift of Four Roller Plate Bending Machine, Metal Plate Rolls: Definition, Types And Applications, Basic Guide to Roll Bending And Plate Roll Capacity Conversion. What Are The Criteria? 0000118619 00000 n HUMs1XE-2fH)=$ .$3Y$q%D%) o#OM|MY=WrJF)%{f{jg;-.qp;^9yAi HTiVD'3*"9n ]?LeJbQFj{|6wnonn~+6kN\sB%j^ksdOl_ {VZach^3AXptj-Da:Ks3P8 TTI:iEQ \>92_yEqJ1J9pw-&V+O6'>f"#.b29Kcc.bXOak*iZ-;(, Cr)]WNKw/f)Fm'Td]0UQc( Features of Three Roller Rolling Machine. Amol 2 Student1 AsstProf2 Dept. Four roll plate bending machine is featured convenient center alignment, small surplus straight edge, high accuracy roundness correction, high efficiency as well as ability to complete pre-bending and workpiece forming in one-time rolling without switching the plate end. x]qF>wEIT'MyIoq&@ %%!_>cG/gS yoo~>}N=ko>MM_-O$^~{beFcGINF^J=>:_L7Wcj,B/o:&qYN}wh~YtZN5%~l:1hcGeiY'i]0[+PF ;^gtqu4 tEHTF;thO$Wk:RUzMUQ PnF~~yvqwI}og{^~>KY $},yuaGh/}qdat;;p1Q?O,yqyTIbB(1|Nprb;Giq|r= Operating Parameters of the Machine Begin with selecting the correct machine to roll the part on. ga 5.0pB3 n)il8FtabE3GrpyL4e478axB:bsbx| 4mtk&`29{B1Aa(51Jj.cui! ?:0FBx$ !i@H[EE1PLV6QP>U(j 0000006475 00000 n }2sSrG ty* endstream endobj 242 0 obj <>stream Thicknes of the sheet is1.6mm., Kindly guide me through this issue. $4%&'()*56789:CDEFGHIJSTUVWXYZcdefghijstuvwxyz ? 0000118667 00000 n 0000005792 00000 n A4x 6c90J9xdV\YmrgGfy8)L'msQ%ru &; xtu$KR=|cS8"2GB=\t50Q7 lp0[u2#4ad}o x j|2 I have worked in the metalworking industry for more than 10 years. 0000000936 00000 n } !1AQa"q2#BR$3br 113 0 obj <>stream Results 1 - 10 of 36 Maa amake aste kore ma ke chude bou banalam in bengali font and Pet Korlam Results 1 - 7 of 7 a k rape korar. 0000144872 00000 n Would you be interested in drawing the correct specifications for us on consultancy basis. 0000021112 00000 n endobj Then use one-time feeding or multi-time feeding to roll continuously until reaching the required cylinder curvature radius. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); With over 20 years of experience in metalworking and mechanical engineering, we're dedicated to providing top edge machinery, expert consultation, quality customer service to you so as to help you get more out of your metal! 0000140845 00000 n The functional relation of true stress can be expressed as follows: The linear reinforcement modulus of the material, can be found on the relevant manual. Four-roll plate rolls generally are the only equipment with NCs or CNCs because the fourth roll provides constant pinching action minimizing the chance for slippage. % <> In general, rolling a metal sheet into a cylindrical workpiece on a four-roll bending machine consists of four processes, namely. According to the principle of three-point forming, the rolling machine makes use of the relative position change and rotation motion of the working roll, so that the sheet can produce continuous elastoplastic bending to obtain the workpiece with predetermined shape and precision. *1 J "6DTpDQ2(C"QDqpIdy~kg} LX Xg` l pBF|l *? Y"1 P\8=W%O4M0J"Y2Vs,[|e92se'9`2&ctI@o|N6 (.sSdl-c(2-y H_/XZ.$&\SM07#1Yr fYym";8980m-m(]v^DW~ emi ]P`/ u}q|^R,g+\Kk)/C_|Rax8t1C^7nfzDpu$/EDL L[B@X! 0000160019 00000 n The power of the main motor can be obtained from the value of P. Send us a message or leave your comment below to let us know what's in your mind. 0000006497 00000 n endobj p?ujV#?%*OF;[a6wY[vcj(mcYRs3FzZbaTOI bvb bM$tkB;`$Z-J eRN?HQl`c%Q%@99m?hb Wo >I&5qV'>h=+WF:V|7Wm),qf7( A)EHQ! DESIGN CALCULATIONS The whole machine elements are. because I am traying to make one sheet rolling machine. 2 0 obj %PDF-1.4 % Does having the top roller driven as well affect the torque requirement? (1) According to the structure characteristics and working principle of the four rolls plate bending machine, the force of the working roller is analyzed, and the calculating formula of the working roll under the different arrangements is obtained. A rigid forming roller a free. 0000001706 00000 n Sir, how we can decide the roller diameter if we want to make the pipe of 25 to 50 mm dia.from 1.5- 2 mm sheet thickness,and also please tell us about other design calculations like speed of roller, bottom roller distance etc.. Is the lower roller drive torque for each roller, or is it the sum of both together? =0.65-0.8. @~ (* {d+}G}WL$cGD2QZ4 E@@ A(q`1D `'u46ptc48.`R0) 0000006428 00000 n 0000179584 00000 n Things About Metal SpinningAnd Its Operation Steps You Should Know, Basics of Hydraulic SystemPressure Cylinder. Colton 2 Overview Process Equipment Products Mechanical Analysis Defects. The flowchart of heavy plate production in Oxelsund. % Load Analysis And Driven Power Calculation Symmetrical 3 Roll Plate Bending Machine Machinemfg, Pdf Design And Fabrication Of Sheet Rolling Machine A Project Report Vino The Great Academia Edu. Privacy Policy | Terms and Conditions | Sitemap. 4 0 obj 0000003024 00000 n Ad Steel Plate Rollers With Precision Up To 14 Thick - Heavy Steel Plate Rollers. 1 0 obj %PDF-1.5 0000004659 00000 n 0000061384 00000 n 0000011061 00000 n Move the plate to the other end of the machine and pre-bending with the same method. S7Y4l= Design Development of Three Roller Sheet Bending Machine Mahesh Gadekar1 Mr. Plate Roller Machines by Piranha-Bertsch - Precision Bending Up To 14 Thick. 3 0 obj (2)The rollers are arranged in a asymmetrical manner. Windseaker1 Sorry for being late getting back yes the bend formula works for rolling as well when you roll a plate you are bending it on a large radius the metal still has to. %PDF-1.3 % endobj As shown in FIG. /N 3 x\YsG~WUbc"dKc. A Project Report On DESIGN AND FABRICATION OF SHEET METAL ROLLING MACHINE, SHEET METAL ROLLING USING TWO ROLLER POWERED MACHINE, (IJIERT) International Journal of Innovations in Engineering Research and Technology IJIERT, NOVATEUR PUBLICATIONS INTERNATIONAL JOURNAL OF INNOVATIONS IN ENGINEERING RESEARCH AND TECHNOLOGY [IJIERT] " SHEET METAL BENDING MACHINE ", Development and evaluation of metal rolling machine for small-scale manufacturers, j Analytical and empirical modeling of top roller position for three-roller cylindrical bending of plates and its experimental verification, VYSOK KOLA BSK -TECHNICK UNIVERZITA OSTRAVA FAKULTA METALURGIE A MATERILOVHO INENRSTV, Modeling and computation of the three-roller bending process of steel sheets, Fabrication and Welding Engineering - Google Books, A hybrid approach to the development of a multilayer neural network for wear and fatigue prediction in metal forming, Design And Analysis Of Portable Rolling And Bending Machine Using CAD And FEA Tool, mechanical design peter r n childs 558450d21c, Advanced Design and Manufacture to Gain a Competitive Edge, Metal Forming: Technology and process modelling, Bendability Analysis for Bending of C-Mn Steel Plates on Heavy Duty 3Roller Bending Machine, Design of Multistage Three Roller Pipe Bending Machine, International Journal of Scientific Research in Science and Technology IJSRST, Mechanismsand Mechanical devices NEIL SCLATER, Effect of entry bending moment on exit curvature in asymmetrical rolling, MECHANISMS & MECHANICAL DEVICES SOURCEBOOK Third Edition, [Rajender Singh] Introduction to Basic Manufacturi(BookFi.org). w !1AQaq"2B #3Rbr How to Check The Paint Color Difference of The Product? H]n!g`YA.a6Rzl*"E|0)dJ94R7Tr^BGX-2FArVkiT2q^/d|~ Q%wI;C!yV=u$X@8]EtOMRl=L68b#V 0000133831 00000 n Enter the email address you signed up with and we'll email you a reset link. stream The force of the steel plate is shown in FIG. 0 - The distance from the neutral axis to any point; The radius of curvature before the neutral layer rebound, can be calculated as follows: K0 The relative strength modulus of the material, can be found in the relevant manual. 5 0 obj my roller dia is 120mm all three rollers. <> ]gct}2e684s_>L!%:qh aHiPVcLl L^`l20. !O4it ef#-5W)nL& alf&S<=>d`_?R"&Zwn:X%L4yNEFD!u:@2a$_.Ocdn%DO4Cb-:{onSu *EqgbF{YI4|uak|Y#W:h!N k1''w:PKIi^;czI'0y-Gtru466SSVs}Oz#5}3.kFJ:ii;S84+^Mm8#msK'; Gc-H]I^=3t1Sqm 5+#h)PP@"}O$Nky,a'i]/R{mNw[Y9VC[y`5^JG[}qCyj~tm/'W22n{d5HNG?r^"oy)"" wGa.u`FvAR_VuT*3do:v&Qt~ldO:I=q.=AQ1S|>iJnkKC9Jif(r(IYYt K-*2 0000003916 00000 n Sorry, preview is currently unavailable. (2) On the basis of analyzing maximum deformation bending moment and the bear force of working roller, combining function transformation principle, to establish the relationship between the force, bending moment, and device driver power, and put forward a method to calculate the driving power of main drive system. 65 49 dear sir, 0000023249 00000 n First, the force parameters of the roll bending machine need to be confirmed, such as pressure on the roller, bending torque, and motor-driven power. I want to know that what is the distance between two rollers of sheet rolling machine. << 0000008665 00000 n endobj M k bending torque kNm. 0000001842 00000 n The torque that is consumed in the deformation can be determined by the work done by the bending internal force and by the force equal to the external force on the upper roller. endobj <> 0000002183 00000 n 0000003735 00000 n According to the force balance, the force of each working roll on the steel plate can be obtained: FH Hydraulic output force of lower roller; Fa Upper roller plate rolling deformation force. The total driving torque on the upper roller is: The calculation formula of driving power is: According to the actual application condition of the four-roll plate bending machine, the driving power of the driving roller is calculated during the pre-bending and rolling process, and the driving power of the main drive system is the larger value in the calculation result: Pq Driving power of the main drive system; PY The driving power of the driving roller when pre-bending; PJ The driving power of the driving roller when rolling circle. The force of the steel plate is shown in FIG. In this post the calculation of the. Bending method for rolling operation. Therefore, it is necessary to do the force analysis of the four-roll machine separately. Initial deformation bending moment is: According to the structure characteristics of the four rolls, it is easy to know that the four working rolls can be arranged in two different ways: Rollers are arranged in symmetrical arrangement and asymmetrical manner. Hello, <>>> Borisbang Industrial Technology (BIT) 2022, Four-roll plate bending machine structure and working principle, Operation Manual of PBR-T 3-Roll Bending Machine. (1)The rollers are arranged in a symmetrical manner. If too large, the output power can not be fully utilized which will waste the electricity. The two ends of controlled by PLC. P the total. Pdf Development And Evaluation Of Metal Rolling Machine For Small Scale Manufacturers. 0000003965 00000 n Your email address will not be published. 65 0 obj <> endobj In order to obtain the specified radius of cylinder curvature, the side roller bearing pedestal can move up and down in the direction of a certain angle with the vertical direction. 1 0 obj trailer 0000004014 00000 n Plate Rolling - Capacity Calculator - Table showing maximum cylinder length we can roll for given diameter and wall thickness. 0000008365 00000 n The weight of the plates is between 16 and 133 tons. stream Modern rolling machines are usually cambered crowned at 50 of the full-rated value of the. 0000114279 00000 n (EhT%~D{RuKja6iE$zArj~2m]sf k^ endstream endobj 243 0 obj <>stream 0000020398 00000 n 0000119719 00000 n The upper roller is the main drive roller, which is embedded in the high and low frame through the bearing body, and its position is fixed, so it can only do rotary motion. 0000003907 00000 n All the material is reheated before rolling up to 1160-1245C. The two side rollers are installed in the bearing pedestal. Pdf plate rolling machine design calculations pdf. Plate Roller Machines by Piranha-Bertsch - Precision Bending Up To 14 Thick. GN.wd` TqN;|3[s8$95WV! <> 0000004379 00000 n endobj x}m\wi&:|?1,%7XFmivebSHE!YU,>y~s[7Ov'/}fws~///wm!aJ\K.6?>owbu=}{/S]z2\K/nu"c{L^OH'9GS. The motor power can be calculated according to the following formula. xwTS7PkhRH H. 0000004112 00000 n HUK1)r1s#HKf&8S.q{;`Mw1DI\?f}?>|# What You Should Know About The Four Strength Theory. 0 The angle between the force action line of the side roller and the force line of the upper roller. trailer <<3DE3A42CB71F44D88629E9ECC21584A4>]>> startxref 0 %%EOF 266 0 obj <>stream The motor power should be chosen properly. The two lower roll can move up and down in arc way. This paper presents the design construction and evaluation of a sheet metal rolling machine for small-scale enterprises. Friction torque of shaft roller in symmetrical arrangement: Friction torque of shaft roller in asymmetrical arrangement: f Coefficient of rolling friction,f0.8mm, Sliding friction coefficient of the roller neck, 0.05-0.1. Calculation of motor driving power of plate rolling machine. 0000160481 00000 n The calculated value Pqof the driving power can be used as the basis for selecting main motor power. 0000001711 00000 n Ad Call Knowledgeable Sales Engineers For A Quote Or Machinery Details. {{{;}#tp8_\. 3. The load analysis of the rolling machine can be reference data for designing parts of plate rolls. 0000089251 00000 n @Rt CXCP%CBH@Rf[(t CQhz#0 Zl`O828.p|OX Is this applicable for 1 inch steel pipe? 0000001276 00000 n Make formula (17) equal to formula (18), we get the torque consumed in deforming: The torque for overcoming friction can be determined by formula (19) and (20). To browse Academia.edu and the wider internet faster and more securely, please take a few seconds toupgrade your browser. The present innovation relates to the plate bending machine which operates with rollers. The angle between the force action line of the upper roller and the force line of the lower roller; The angle between the force action line of the upper roller and the force line of the side roller. %%EOF 0000139991 00000 n I:u|{z;7&nb!vtSzM1hRK !w6Mrm "cr G^*sd7n #^~3as +eWz'vgF:7cT( t353UV{fp5iBD4#^:iJm)x ((mn%(yA7W1i,p|nn"(Z %&'()*456789:CDEFGHIJSTUVWXYZcdefghijstuvwxyz /Length 2596 ]c\RbKSTQ C''Q6.6QQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQ , +" Therefore the calculation of the force analysis and driving power of the plate rolling machine is very important to the design of the roll bending machine. 0000022847 00000 n 0000117264 00000 n You can download the paper by clicking the button above. The value of 0can be determined by following formula according to geometric relationship: Tilt Angle of the side roll, which is the angle between the adjustment direction of the side roller and the vertical direction; A The distance from the intersection point of the roll angle to the center of the upper roller. 0000001623 00000 n 0000020187 00000 n Y[V'iT,X{Z{"-? 0000009182 00000 n In order to compensate the thickness of the bent plate, the bearing pedestal can do the straight-line movement in the sliding guide groove of the frame. Finally, do the roundness corrections in order to get the required roundness and cylindricity. Thus it can be seen that when bending the plate with four rolls, it is necessary to put the plate into the rolling machine only once to achieve the purpose of all the bending rolls. 0000006202 00000 n " zTvQ\+ F aA-,' {W5ziZS <> <> 0000001667 00000 n 2.1 Maximum torque required for a cylinder rolling, Top 10 Shearing Machine Manufacturers in China (2022 Updated), Global Top 10 Press Brake Manufacturers (2022 Updated), Top 20 Laser Cutting Machine Manufacturers in 2022, Pump Control Technology: ItBrings Performance Upgrade to Hydraulic Press Brake, 13 Types of Springs: Performance And Application. 0000139137 00000 n Friction torque including frictional resistance consumption to overcome shaft roller rolling on bending plate and torque consumption in the roller bearing friction. 0000160707 00000 n 6;~WP/tzZ '9@h@>{B?2BPAd}'7%. The lower roller is fixed in the bearing pedestal. `XG?zUILo9tNq: r5+GA>m8s{8n>t4O{JJY Hq'"upA*.QU W>. !(!0*21/*.-4;K@48G9-.BYBGNPTUT3? <<4330B05FF420BA4C8FD1B4A9C958418B>]>> Required fields are marked *. <> 0000160568 00000 n It has been widely used in boiler, shipbuilding, petroleum, chemical industry, metal structure, and mechanical manufacturing industry. JFIF ` ` C The total drive torque acting on the upper roller is adding up the torque consumed on the deformation and overcomes the friction. Do you have design and analysis data for tank turning roller? 3 0 obj $2XFR$PO]^N;T?2 wV(QX^0(~RT>jX|g^R/X{ki:yQ)ETu(Fr*7?_Rgz )4j9jNb2[F5[4uv0!)5J@g\fA'N{C;\r~+AgzAGoqBzc}vW9BX\>`q! According to the actual application conditions, the driving power of the pre-bending and rolling is calculated respectively, and the main motor power is selected based on the larger value of the calculated results. K1 Shape coefficient, rectangular cross section1.5. E([Q"x?W=un> {FzGq j)):dS8{R5 In this post the calculation of the. 0000001800 00000 n 0000020789 00000 n 0000000016 00000 n xb``f``)f`c`daf@ aV(, J8i9s;@*i;ene m:L6)E>9])7eF?6]|@5[(yl;3oKvf^On+}i` KKk0666q qK )44, According to the requirements of customers we can. Thanks. endstream startxref Ad Steel Plate Rollers With Precision Up To 14 Thick - Heavy Steel Plate Rollers. vYYC;&1U="f]o$+i=5i A88VpQ_.28:c/ TY&:r18/G;v,/6xP8XXu#og4}Q@GR V'2*oQH) j2K&%z-AJ`}E 4Qo5. Therefore, doing load analysis and improving driven power calculation of four roll plate bending machines have important practical value for choosing the proper motor. It occupies an increasingly important position in sheet metal forming. F7&+&|a "pv(R@""3iV&`TE#`bx+ }AHs UF ;`m@4NsP b>5)@ endstream endobj 236 0 obj <> endobj 237 0 obj <> endobj 238 0 obj <> endobj 239 0 obj <>/ColorSpace<>/Font<>/ProcSet[/PDF/Text/ImageC]/Properties<>/ExtGState<>>>/Type/Page>> endobj 240 0 obj <> endobj 241 0 obj <>stream 2 0 obj A Project Report On DESIGN AND FABRICATION OF SHEET METAL ROLLING MACHINE Submitted By HARSHDEEP SINGH INAYATULLAH FAROOQUI Under the guidance of Prof. Rolling of threads imparts improved strength because of cold working and favorable grain flow. 0000116769 00000 n When pre-bending the other end of the plate, the metal sheet does not need to take out from the rolling machine. 0000010127 00000 n Hi, I'm Shanefounder of MachineMfg. A plate rolling machine is a kind of universal forming equipment to roll sheet metal into cylindrical, arc, and other general shapes of the workpiece. [emailprotected], Sir, 0000003027 00000 n The calculation of the main driven power of the plate roll bending machine is the key reference data for choosing the main motor. During rolling machine operation, first place the front end of the bending roll plate between the upper and lower roller, and align the center (lift one side roller, aligning plate end and side roller), then lift the lower roller to press the plate tightly and lift the other side roller to apply a force which makes the end of the metal plate bending. 0000021976 00000 n if the calculation result is 30Nm, is that 30Nm per shaft, or 15Nm each for a total of 30Nm? The lower roller of the plate of plate rolling machine is the 2653 1 For thickness F 2 T R neutral layers radius of the rolling in mm R 05 d min R 05388 194 mm F 2 F 2. CALCULATIONS OF COMPONENTS 31 Design of Spur Gear Material EN8. %PDF-1.4 xb```a``b`c`*bb@ !V( The upper roll on 3-roll plate bending machine is fixed. % Hello, why do you only consider Tn2 and not T for Power equation. 5 0 obj The roll bending force condition is relatively complex during the working process of four roller plate bending machine, and it bears a great load which requires the bearing parts has enough strength and rigidity. The working roll of the four roller plate rolls consists of four rolls: upper, lower and two side rolls. 0000003868 00000 n 0000117950 00000 n 0000145426 00000 n The bending moment on the cross section is: In above formula: The maximum width of rolled sheet steel plate. \'7,kx5&ib3~k4\C 0+1~HOIaV5l0@03'vqC8zF_}zgG(\X=+%~!.`W_zc{5GTM[Nf_r|r@5%]ZGB+-( y] {Mvi>x$c~[cAmw5?)?~*I 0000132994 00000 n 0000160306 00000 n Your email address will not be published. The diameter of 3 shafts is 58mm. 0000004761 00000 n I made a 3 roller machine of bed length 3600mm, But when tried for bending the center part of the sheet did not bend . 0000012018 00000 n 0000120272 00000 n 0000138283 00000 n 0000004745 00000 n <>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 595.32 842.04] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>> Ad Steel Plate Rollers With Precision Up To 14 Thick - Heavy Steel Plate Rollers. 4 when the roller is arranged in an asymmetric manner. 0000006604 00000 n 3 0 obj Gtx1+=wg\!` +v`@^6 D '#c Xy$WhjARtxfMo?

Sitemap 26