h.- Cálculos de perforadoras h.1.- Principio de Percusión 1.- Area del émbolo en viaje de trabajo (A) A = π * r 2 ; cm2 Donde: r = Radio de cabeza del émbolo; cm . Area del émbolo en viaje de re!reso (A") A’ = A - Area de cuello del émbolo ; cm 2 #. Aceleración del émbolo en viaje de trabajo (a) a = Fuerza/masa a = (presión de aire * A/(!eso émbolo/"ra#edad ; m/se" 2 !resión = $"/cm2 !eso = $" %ra#edad = m/se" 2 $. Aceleración del émbolo en viaje de re!reso (a") a’ = (!resión de aire * A’/(!eso émbolo/"ra#edad ; m/se" 2
%. &iempo del émbolo en viaje de trabajo (t) & = √'/a ; se" Donde: ' = 'on"i&ud 'on"i&ud de carrera) es decir lon"i&ud lon"i&ud cilindro cilindro anc+o cabeza del pis&ón; m '. &iempo del émbolo en viaje de re!reso (t") &’ = √'/a’ ; se" . &iempo del ciclo (&) , = & &’ ; se" . *+mero de !olpes por minuto (*,min) .%/min = (0 se"/min/, ; "olpes/min . &rabajo efectuado (/) 1 = Fuerza * 'on"i&ud; $" Fuerza = masa * aceleración = (peso/"ra#edad * aceleración = !resión * Area 1 = !resión * Area * 'on"i&ud; $"m
h..- Principio de percusiónrotación 1.- Area del émbolo en viaje de trabajo (A) A = π * r 2 (cabeza pis&ón - π * r 2 (cuello barra es&riada; cm2
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.- Area del émbolo en viaje de re!reso (A ) A′ = π* r 2 (cabeza pis&ón - π * r 2 (cuello pis&ón; cm 2 #.- 0evoluciones por minuto (0P) R! = (.%/min/(%R Donde: %R = 3l n4mero de "olpes por cada re#olución; re#olución; es decir) el n4mero de dien&es de la 5a6a de ,rin7ue&es 3l res&o de c8lculos son similares a los c8lculos para percusión
h.#.- Caudal de aire para perforación (2)
9 = (olumen/ciclo * ' * 0 se"/min * Rp/(0 * ,; m : >: ma?o ma?orm rmen en&e &e)) depe depend ndie iend ndo o de la eic eicie ienc ncia ia mec8nica del compresor) de la luz en&re el pis&ón ? el cilindro) e&c 0 = 5ons&an&e para &ransormar cm < a m< , = ,iempo/ciclo) es decir suma&oria de &iempo de carrera de &raba6o ? &iempo de carrera de re"reso; se"
Ejercicio:
5on&ando con los si"uien&es da&os de una !3RF@RAD@RA D3 !3R5BC@.) calcular las órmulas descri&as an&eriormen&e Di8me&ro de cabeza del émbolo cm Di8me&ro del cuello del émbolo E cm Anc+o de cabeza de émbolo 20 cm !resión de aire $"/cm2 ( psi !eso del émbolo 2 $" %ra#edad G> m/se"2 'on"i&ud de carrera del pis&ón 00> m Solución:
A = <E * (<2 = A’ = <>EG - (<E * 222 a = ( * <>EG/(2/G> =
<>EG cm2 = 22G cm2 GE<G m/se"2
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.%/min = 0/00G 1 = * <>)EG * 0)0>
= =
<)0 "olpes/min <0 $"
3jercicio Be &iene &iene una una per peror orad adora ora de percus percusió ión-r n-ro& o&aci ación ón 5on 5on los los da&o da&oss an&e an&eri rior ores es re7ueridos ? con los si"uien&es: Di8me&ro de la barra es&riada 2<0 cm 'on"i&ud de carrera del pis&ón >0 cm Relación presión aire comp a aire a&m : .umero de "olpes por cada re#olución) < Hallar R! ? 9 Bolución R! = <0 "olpes/min/< = > R! 9 = (A AI * 0 se"/min * /(0 * , = (<>E> E * > * 0 * /(0 * 00G = EEE m
i.- 4elocidad de penetración ! = < * (!@,/D E Donde: !@, = !o&encia ciné&ica disponible en el mar&illo; J1 D = Di8me&ro del barreno; mm 36emplo !@, = > J1 D = 00 mm Bolución ! = < * (>/00 E = 0>> m/min
j.- Cálculos de perforaciónvoladura perforaciónvoladura 1.- Cálculo del n+mero de taladros a perforar (*) se"4n el A.A' D3 3K!'@BC@B de 9uLmica Bol BA para un ren&e cie"o
. = R/5 JB Donde R = 5ircunerencia aproMimada de la sección; m 2 = √ B * E B = Bección del ren&e; m 2 = anc+o * al&ura * c"
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&5P6 06CA
73 758&A*C5A &A9A7068 (C) Roca dura 0 m Roca semidura 0 m Roca blanda 0 m
C63:5C53*&3 (;) 2
!ara el caso de peroración peroración en &a6eos &a6eos o &a6os) &a6os) la dis&ancia dis&ancia en&re &aladros &aladros ? en&r en&re e ilas las de &alad aladro ross se ob&i ob&ien ene e lue"o ue"o de una una seri serie e de prueb ruebas as)) considerando si es peroración +orizon&al (breas&in") inclinada o #er&ical) en&re o&ros
.- Cálculo de &iempos durante de ,uardia Re7uie Re7uiere re la par&ic par&icipac ipación ión de persona personall capaci capaci&ad &ado) o) 7uien 7uien con el apo?o apo?o de ins&rumen&os ? ma&eriales de &raba6o) se dedicar8 duran&e un periodo a medir los &iempos de cada labor 7ue desarrolla el peroris&a ? su a?udan&e 'a inalidad de es&as mediciones es conocer los &iempos eec&i#os An&es) Duran&e Duran&e ? Después Después de la !eroración) !eroración) con los 7ue podremos podremos eec&uar eec&uar los c8lculos reales Debe considerarse el promedio de #arios con&roles) sea en el &a6o) ma&eria del es&udio o el promedio de mediciones eec&uados en #arios &a6os Be ad6un&a 02 +o6as 5@.,R@' D3 ,C3!@B #.- &iempo de perforación por taladro = ,iempo &o&al de de peroración/,aladros perorados; min $.- 4elocidad de perforación por taladro = 'on"i&ud &aladro/,iempo &o&al &o&al peroración &aladro; pie/min %.- Pies perforados por !uardia = 'on"i&ud &aladro * &aladros perorados; pie/"dia '.- 3ficiencia de la perforación = (,iempo eec&i#o peroración * 00/> ; N .- 4olumen roto por disparo = a * + * p * c" * e; m
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Donde: pe = !eso especLico del ma&erial ro&o
.- Peso de dinamita por disparo = !eso de cada car&uc+o * car&uc+os/&aladro * &aladros car"ados; $" 3n el caso de car&uc+os de dinami&a de />P ∅ * P) "eneralmen&e es >0 "r de peso de cada uno 1<.- *+mero de fulminantes simples por disparo = .4mero de &aladros a encender 11.- 9on!itud de mecha de se!uridad por disparo = Buma&oria de lon"i&udes de mec+a de se"uridad de las armadas ? de c+ispeador o mec+a de se"uridad; pie o me&ros 1.- :actor de potencia del e=plosivo = !eso &o&al &o&al dinami&a/&onela6e ro&o por disparo; $"/,B 1#.- Consumo de aire comprimido por disparo 1#.>1.- Para Perforación? 5onsumo/"dia = 5onsumo a co&a de &raba6o * 0 min/+ora * ,3 ; pie "dia 5onsumo a co&a de &raba6o = 5onsumo al ni#el del mar * F Donde: F = Fac&or de corrección por al&ura = (((!a@(!m+ !a+/((!a+(!a@ !m+ !a@ = !resión !resión a&mosérica a&mosérica al ni#el del mar Be +alla con la ,abla de A,@BF3RAB B3%Q. .@RAB BA G2 ad6un&a !m+ = !resión manomé&rica (lec&ura del manóme&ro !a+ = !resión a&mosérica a co&a de &raba6o( ,abla ,3 = ,iempo eec&i#o de &raba6o duran&e la "uardia 1#..- Para Afilado de @arrenos 5onsumo/"dia = 5onsumo a co&a de &raba6o * 0 min/+ora * ,3 * N; pie/"dia (se si"ue el procedimien&o an&erior) con sus propios da&os ,3 = ,iempo eec&i#o de &raba6o de ailado duran&e la "uardia N = Sarrenos Sarrenos a usar en el &a6o * 00/&o&al 00/&o&al barrenos ailados ailados en la "uardia 1$.- Consumo de a!ua por disparo
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0 = Be"4n el Ar& 22T inciso i del R3%'A3.,@ D3 B3%RCDAD B3%RCDAD 3 HC%C3.3 C.3RA) se debe u&ilizar una can&idad mLnima de 0) l&/se" de a"ua ,3 = ,iempo eec&i#o de &raba6o de peroración duran&e la "uardia
1$..- Para 9avado del :rente de Perforación 5onsumo/"dia = 2 l&/se" * <00 se"/+ora * ,3; l&/"dia 2 = 3mpLricamen&e se considera 2 l&/se" la can&idad mLnima de a"ua a usar para el la#ado del ren&e de &raba6o 1$.#.- Para Afilado de @arrenos 5onsumo/barre 5onsumo/barrenos nos usados en "dia = 02 l&/se" l&/se" * <00 se"/+ora se"/+ora * ,3; * N; l&/"dia 02 = 3mpLricamen 3mpLricamen&e &e se considera 0)2 0)2 l&/se" la can&idad can&idad mLnima mLnima de a"ua a usar para el ailado de barrenos N = Sarrenos a usar en un &a6o/ &o&al de barrenos ailados en la "dia Ejercicio:
5onociendo los si"uien&es da&os) realizar los c8lculos para un &a6eo u&ilizando los cuadros ? las órmulas an&eriormen&e descri&os: .4mero de &aladros 2 'on"i&ud de cada &aladro pies Anc+o del ren&e del disparo <) m Al&ura del ren&e de disparo 2)< m !roundidad del ren&e de disparo ) m Fac&or de corrección "eomé&rica 0)G m 3iciencia de disparo GN !eso especLico del mineral 2)G !eso de cada car&uc+o de dinami&a 0)0> $" .4mero de car&uc+os por &aladro 'on"i&ud de cada armada pies 5onsumo de aire de peroradora a ni#el del mar 2E pie0 psi !resión manomé&rica de ailado 0 psi Horas eec&i#as de peroración <)E< Horas eec&i#as de la#ado de ren&e 0) Horas eec&i#as de ailado de barrenos
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- 58lculo de &iempos duran&e la "uardia: Be ad6un&a los cuadros de con&rol de &iempos de peroración 22- ,iem ,iempo po &o&a &o&all per perora oraci ción ón/& /&ala aladro dro = 20) 20)EE EE min/ min/2 2 &ala &aladr dros os = ) ) min/&aladro <- elocidad media de peroración = /) = 0) pie/min E- !ies perorados por "uardia = * 2 = < pie/"dia - 3iciencia de peroración = (<)E> * 00 = E2)>>N - olumen ro&o por disparo = <) * 2)< * )E * 0)G * 0)G = 0)<2 m< - ,onela6e ro&o por disparo = 0)<2 * 2)G = 2G)G< ,B >- !eso dinami&a por disparo = 0)0> * * 2 = 0)> $" G- .4mero de ulminan&es simples .o = 2 0- 'on"i&ud de mec+a de se"uridad = ( * 2 <)2> = G2)2> pies = >) m Fac&or de po&encia = 0)>/2G)G< = 0)< $"/,B 2- 5onsumo de aire comprimido por disparo - !ara peroración F = UE)>G(>0 >)GEV/U>)GE(E)>G >0V = )E 5onsumo a co&a de &raba6o = 2E * )E = 0) >0)0 00 0< < pie pie "di "dia a -
!ara ailado F = UE)>G(0 >)GEV/U>)GE(E)>G 0V = )< 5onsumo a co&a de &raba6o = 2 * )< = <>)2 pie )2 <>)2 * 0 min/+o min/+ora ra * * ( 2/E0 2/E0 = >>) >>) pie" pie"dia dia
<- 5onsumo de a"ua por disparo - !eroración = 0) * <00 * <)E< - 'a#ado de ren&e = 2 * < 00 * 0) - Ailado de barrenos = 0)2 * < 00 * * (2/E0 C6*&069
73
&53P68
= E l&/"dia = 22E l&/"dia = 20 l&/"dia
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SUB TOTAL
118.00
1.97
DRA.,3 'A !3RF@RA5C@. Desa&e de rocas 2. 5ambio de barrenos (a) 3. !osicionamien&o empa&e (a) 4. !eroración barrido (a) 5. Re&iro de barreno (a) 6. Sarreno plan&ado (a) 1.
22 0 2022 G0 E 00G >E 0<
SUB TOTAL
228.00
3.80
SUB TOTAL
30.00
0.50
00 <000 00
02 00 02
0> 02 0
A'3RW@
D3B!3B D3 'A !3RF@RA5C@. 5amina&as 2 Cn Cnopera&i#os < Desins&alación del e7uipo ? &raslado 4. !reparación de 2 cebos 5ar"uio de &aladros !reparador del c+ispeador 7. 5+ispeo manual SUB TOTAL
&6&A9
200 <000 <00
020 00 00
00 104.00
$ < . < <
02 1.73
. <<
(a) Control de tiempos de perforación (in situ).
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A&68:30A8 83,B* 9A8 *60A8 .8.A. - 1'
A9&5&7 m 0 00 200 <00 E00 00 00 >00 00 200 E00 00 >00 2000 2200 2E00 200 2>00 <000 <200 00 E000 E00
P03856* lbpul!D E)>G E) E)E> <)E <)< <)0< 2) 2)E2 2)0> )> )2> )2<> 0)G2 0)0 0)E2 0) G)G> G) G)E G)G >)GE > <
&3P30A&0A EC )0 E)E <) <) 2)E )> ) G)> >) )2 )G E) <)< 2)0 0) 0) )G <)2 E) )> ) >)E G) )0 E 2
73*857A7 lbpieD 00 0)0 0)0 0)0E 0)0E 0)0< 0)02 0)0 0)0G 0)0> 0)0 0)0 0)0E 0)0< 0)02 0)00 0)0G 0)0> 0)0 0)0 0)0E 0)0< 0)02 0)0 0 0E>
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F.- Cálculos de rendimiento G avance de perforadora jacF le! 0endimiento de la perforadora ( 0 ) R = 0 min/+ora * * , * . Donde: R = Rendimien&o de la peroradora; m/"dia = elocidad de peroración; m/min , = Horas normales por "uardia; > +oras & = Horas ne&as de peroración; +oras . = Fac&or de peroración; relación &/,; s/u Avance teórico por disparo = R/.4mero de &aladros/"dia; m 3jemplo na peroradora 6ac$ le" &iene una #elocidad de a#ance de 0 pul"/min ? &raba6a E0 +oras perorando <0 &aladros duran&e la "uardia normal de > +oras de &raba6o 5alcular el rendimien&o del e7uipo ? el a#ance &eórico por disparo 8olución R = 0 min/+ora * (0 pul"/min * 002E m/pul" * > +ora/odia * (E0/> = >> m de &al/"dia A#ance = >> m de &al/odia/<0 &l/odia &l/odia = 22G m 36emplo na s&oper a#anza 2 pul"/min en un ren&e de < m * < m duran&e < +oras; el &iempo de peroración por &aladro es de min 5alcular el n4mero de &aladros a perorar) el rendimien&o ? el a#ance &eórico por disparo Bolución
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l..- :ines del Costos? - 5onocer el #alor de la ac&i#idad ("as&o con respec&o a lo producido - Analizar las labores 7ue in&er#ienen ? sus propios re7uerimien&os - Ber#ir de base para la &oma de decisiones - Srindar inormación económica real ? opor&unamen&e l.#.- &ipos de Costos? l.#.1.- Costos de Propiedad - 5ons&i&uidos por la A@R,CWA5C@. del capi&al in#er&ido en la ad7uisición del bien ? por la D3!R35CA5C@. del bien 3n el precio de ad7uisición debe considerarse: Precio :6@ (Free on Soard) Franco a Sordo) es decir el precio del bien pues&o en el !uer&o de ori"en o de embar7ue) o del #endedor 3n es&e caso) los cos&os de embar7u embar7ue) e) impues& impues&os) os) se"uros se"uros ? le&es le&es al lu"ar de des&ino) des&ino) son a cuen&a cuen&a del comprador (5os&) Cnsurance and Frei"+&) cos&o) se"uro ? le&e) es decir el precio Precio C5: (5os&) de ad7uisición del bien pues&o en el !uer&o de des&ino o del comprador 3n es&e caso) los cos&os de embar7ue) impues&os) se"uros ? le&es le&es al puer&o de des&ino es a cuen&a del #endedor 5ual7uiera sea el caso) adem8s se debe incluir los cos&os de &ranspor&e) embala6e)
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ser mu? #ariables las condiciones condiciones de &raba6o &raba6o ? el ser#icio de man&enimien&o man&enimien&o o reparación del bien &ra&ado !ara depreciar) se debe considerar el A'@R R35!3RAS'3 al inal de su #ida 4&il; es&e #alor de sal#a&a6e oscila en&re el 0 ? el 2 N del cos&o de ad7uisición 3l m8s usual es 20 N del cos&o de ad7u ad7uis isic ició ión; n; el res& res&o o ( >0 N ) di#i di#idi dido do en&r en&re e la #ida #ida 4&il 4&il)) cons cons&i&i&u &u?e ?e la Depreciación D = 0> * !recio ad7uisición/ida 4&il Be amor&iza ? se deprecia la peroradora ? el ailador de barrenos
l.#..- Costos de 6peración #.- Costo de antenimiento? 5ons&i&uid 5ons&i&uido o por los cos&os de mano de obra) ma&eriales) ma&eriales) ins&alacion ins&alaciones) es) +erramien&as) e&c duran&e la #ida 4&il de cada bien ad7uirido 3s&e cos&o orece "ran #ariación #ariación por las condiciones condiciones par&iculares par&iculares de cada caso: caso: 3n Ar"en Ar"en&i&ina na)) 5+il 5+ile e ? Sras Srasilil consi conside deran ran el dobl doble e del del on& on&o o de Ad7uisición di#idido por la #ida 4&il 3n 3s&ados nidos ? en el !er4) "eneralmen&e se considera el alor de Ad7uisición di#idido por la #ida 4&il (especialmen&e en minerLa Be usa la órmula:
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= 5onsumo/"dia * 5os&o por li&ro
%.c.- Para Afilado de @arrenos = 5onsumo/"dia * 5os&o por li&ro * N Donde: N = porcen&a6e de consumo de a"ua para el ailado de los barrenos para el &a6o en es&udio) del &o&al de barrenos ailados en la "uardia
'.- Costo de 5mplementos de 8e!uridad '.a.- Para Perforista G AGudante 5P933*&68
Cant.
Costo I
7uración Costo!d ,uardias ia I
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.- Costo de erramientas G Accesorios para Perforación G 4oladura 5P933*&68
Cant.
Costo I
Sarre&illa de > pies 'la#e B&illson > pul"adas Bacabarreno +ec+izo !ico 'ampa 5ombo de libras 5uc+arilla de pies A&acador de madera !unzón 5uc+illa Fósoro (ca6i&a an"uera de aire (m an"uera de a"ua (m Acei&e de lubricación ,@,A'
0 0 />
<0 G G 0 < 2 0) 0) 0)0 0 E
7uració n ,uardia s <2 <2 <2 20 20 2 > 2 20> 20>
costo!d ia I 00G 00G 000 00 00 00<2 0020 0000 000G 000< 0002< 02>> 02E 0000 GG>
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Feriados (0 &areas ,@,A'
<<0 N Bub &o&al
N G2 N
Nota: En el caso del perforista perforista y su ayudante, se considera considera el 100%, en el caso de cada Supervisor, se divide entre las laores a su car!o durante la !uardia y en el caso del afilador afilador de arrenos, se multiplica multiplica por el % de arrenos. Estos porcenta"es porcenta"es pueden variar, en ase a modificaciones modificaciones e#presas (onos (onos de producci producción, ón, vacacio vacaciones nes truncas truncas,, asi!nac asi!nación ión famili familiar ar $ey &1', soretiempos, etc.).
.- Costo de @arrenos = (5os&o ad7uisición 6ue"o/#ida 4&il 6ue"o * pie/"dia perorado Donde: 5os&o ad7uisición 6ue"o = 5os&o de c/u de los barrenos u&ilizados ida 4&il 6ue"o: !a&ero 00 pies con ailadas Be"uidor 00 pies con > ailadas ,o&al E00 pies
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1$.- C68&6 &6&A9 = Buma&oria de los cos&os an&eriores 1%.- C68&6 P60 &6*39A7A 06&A = 5os&o &o&al/&oneladas ro&as Ejercicio: Cálculo de costos Perforación - 4oladura en &ajo
Zac$le" BH3.[A.% [, 2 (inclu?e lubricadora 5os&o de de ad7uisición ad7uisición Y <)<00 <)<00 Lda 4&il) 20 meses (0)000 pies Ailadora %RC.D3K B3.C@R 5os&o de de ad7uisición ad7uisición Y 2)200 2)200
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5onsumo a"ua para peroración: )<E l&/"dia l&/"dia 5onsumo a"ua la#ado ren&e: )22E l&/"dia 5onsumo a"ua para ailado barrenos: E0 l&/"dia Solución:
- Amor&ización a- !eroradora: a = < <00U(( 00 20 * 00/(( 00 20 - V a = G2 2 Y/mes a = G22/( mes * 2 dias/mes * 2 "dia/dLa Y/"dia b- Ailadora:
=
<0
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Eb- 5os&o de aire comprimido para ailado de barrenos = <>2 pie Y/l& Y/"dia b- 5os&o de a"ua para la#ado ren&e peroración = )2EE l&/"dia * 000000> Y/l& Y/"dia
=
0G
=
00
=
00
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= (G Y * < pie/"dia perorad/E00 pie Y/"dia
=
>G0
0- 5os&o 5os&o de dinami&a = car&/&al * 2 &al * 0E2 Y/car& Y/"dia
=
0
- 5os&o ulminan&e simple simple .o = 2 ulm* 0<2 Y/ulm Y/"dia
=
>E
2- 5os&o mec+a de se"uridad = ((20 m/&al * 2 &al m * 0< Y/m Y/"dia
=
20
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-
!eroradoras neum8&icas !eroradoras +idr8ulicas
00 2000 m <000 E000 m
200 00 m 200 <00 m
(! 38&5A&37 AM5* P9976/* (J 1< N diameterD)
Diame&er (in /> ] ^ /> >^ G
aM !ulldo\n (lbs 2)G> 2G)0 <)E <)G0 0)2<< 2)0 )0
Diame&er (in 0 /> 2 ] < ^ E ^ _
aM !ulldo\n (lbs G)EE G>)00 2) <)E )22 >2)20 2E>)0<
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cincel • Cn&er#alo en&re ailadas • Duración en ser#icio Srocas de bo&ones
20 2 m 20 <0 m
0 m G00 200 m
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5 = (0 * F * . * e/(F * S/B J (F/
#.- &aladros perforados por hora = 5/F
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,!/%dia ,!/%dia = Buma&oria Buma&oria de &iempos &iempos de peroración) peroración) man&enimie man&enimien&o) n&o) reparación) reparación) camb cambio io barr barren enos os)) camb cambio io de broc brocas as)) &iem &iempo poss impr improd oduc uc&i&i#o #os; s; +ora/"dia
'.- Porcentaje de uso del jumbo ( )
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'b = e&ros de barreno por cada broca; m e = eiciencia del operador; 0 a 0>
!.- 3Ouipos
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! = elocidad de pene&ración; cm/min ! = !o&encia de la peroradora; $"m/min Re = Rendimien&o de &ransmisión de ener"La; 0 a 0> D = Di8me&ro del barreno; cm 3 = 3ner"La especLica por unidad de #olumen; $"m/cm<
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Trusted by over 1 million members
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Trusted by over 1 million members
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Trusted by over 1 million members
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Trusted by over 1 million members
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Trusted by over 1 million members
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Trusted by over 1 million members
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Trusted by over 1 million members
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Trusted by over 1 million members
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Trusted by over 1 million members
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Trusted by over 1 million members
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Trusted by over 1 million members
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Trusted by over 1 million members
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Trusted by over 1 million members
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Trusted by over 1 million members
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Trusted by over 1 million members
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Trusted by over 1 million members
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Trusted by over 1 million members
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Trusted by over 1 million members
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Trusted by over 1 million members
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Trusted by over 1 million members
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Trusted by over 1 million members
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Trusted by over 1 million members
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Trusted by over 1 million members
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