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Detalles Bibliográficos
Autor principal:	Alejandro Colque C.
Formato:	Artículo científico
Lenguaje:	es
Publicado:	Universidad de Tarapacá 2008
Materias:	Ingeniería Cobre brocas mecanizado machos especiales
Acceso en línea:	https://www.redalyc.org/articulo.oa?id=77216207
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

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Teoría de Bill Mundy en el mecanizado de cobre con brocas y machos especiales Alejandro Colque C. Alfredo Coria C. Juan M. Godoy R. Jorge Vergara D. Ingeniería Cobre brocas mecanizado machos especiales El mecanizado del cobre, debido a su uidez, produce una viruta plástica y continua que afecta la calidad supercial delas piezas mecanizadas. El método desarrollado por el ingeniero norteamericano Bill Mundy permite obtener el mejorángulo de corte para mecanizar un material. El taladrado y el roscado con machos son dos procesos de mecanizado quetienen aspectos en común. Diseños de nuevas herramientas, nuevos materiales y técnicas de mecanizado, mejorías en lalubricación, diferentes velocidades de corte y avances son variables que se deben estudiar para obtener una menor potencia,mayor duración de la herramienta y buen acabado supercial.En este trabajo probetas de cobre fueron ensayadas a tracción y se determinó experimentalmente el ángulo efectivode corte, de acuerdo con la teoría de Bill Mundy. Posteriormente se fabricaron nuevas probetas que fueron perforadascon brocas tipo H, N y W, con refrigeración externa, refrigeración interna y en seco. Se usaron machos de máquina dedos y tres hélices. En cada perforación se midió la velocidad de rotación, avance, fuerza de corte, momento torsor ypotencia necesaria.Se vericó que en el taladrado de cobre un ángulo mayor de la hélice favorece el desmenuzado de la viruta y disminuye elmomento torsor. Brocas con refrigeración interna pueden ser utilizadas con mayores velocidades y muestran una mejor calidadsupercial del perforado. Las brocas y machos con un ángulo de ataque próximo al ángulo calculado experimentalmentepor la teoría de Bill Mundy muestran un buen comportamiento en el mecanizado y menor consumo de potencia. 2008 artículo científico 0718-3291 https://www.redalyc.org/articulo.oa?id=77216207 es http://www.redalyc.org/revista.oa?id=772 Ingeniare. Revista Chilena de Ingeniería application/pdf Universidad de Tarapacá Ingeniare. Revista Chilena de Ingeniería (Chile) Num.2 Vol.16

if (filemtime($filename) + $maxlifetime < time()) { unlink($filename); $count++; } } return $count; } /** * A function that is called internally when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ protected function saveSession($sessId, $data): bool { $sessFile = $this->path . '/sess_' . $sessId; if ($handle = fopen($sessFile, 'w')) { $return = false; // Lock the file for exclusive access to avoid issues with multiple // processes writing session simultaneously: if (flock($handle, LOCK_EX)) { $return = fwrite($handle, $data); // Make sure that there's no trailing data by truncating the file to // the correct length: ftruncate($handle, strlen($data)); fflush($handle); flock($handle, LOCK_UN); } fclose($handle); if ($return !== false) { return true; } } // If we got this far, something went wrong with the file output... // It is tempting to throw an exception here, but this code is called // outside of the context of exception handling, so all we can do is // echo a message.

// Anecdotal testing Today and Yesterday seems to indicate destroy() // is called by the garbage collector and everything is good. // Something to keep in mind though. return 0; } /** * Write function that is called when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ public function write($sessId, $data): bool { if ($this->writesDisabled) { return true; } return $this->saveSession($sessId, $data); } /** * A function that is called internally when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ abstract protected function saveSession($sessId, $data): bool; }

* * @return void */ public function writeClose() { // The assumption is that we're using PHP's ext/session. // session_write_close() will actually overwrite $_SESSION with an // empty array on completion -- which leads to a mismatch between what // is in the storage object and $_SESSION. To get around this, we // temporarily reset $_SESSION to an array, and then re-link it to // the storage object. // // Additionally, while you _can_ write to $_SESSION following a // session_write_close() operation, no changes made to it will be // flushed to the session handler. As such, we now mark the storage // object isImmutable. $storage = $this->getStorage(); if (! $storage->isImmutable()) { $_SESSION = $storage->toArray(true); session_write_close(); $storage->fromArray($_SESSION); $storage->markImmutable(); } } /** * Attempt to set the session name * * If the session has already been started, or if the name provided fails * validation, an exception will be raised. * * @param string $name * @return SessionManager * @throws Exception\InvalidArgumentException */ public function setName($name) { if ($this->sessionExists()) { throw new Exception\InvalidArgumentException( 'Cannot set session name after a session has already started'

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