機械專業(yè)畢業(yè)設(shè)計---英文翻譯原文-wenkub
2022-12-12 17:34:32 本頁面
【正文】 erticalspindle machining center , which is similar to a verticalspindle milling machine , is shown in ． The tool magazine is on the left of the figure and all operations and movements are directed and modified through the putercontrol panel on the right ． Because the thrust in vertical machining are directed downward , such machines have high stiffness and produce parts with good dimensional accuracy ． These machines are generally less expensive than horizontalspindle machines ． Horizontalspindle machining centers , or horizontal machining centers , are suitable for large as well as tall workpieces that require machining on a number of their surfaces ． The pallet can be swiveled on different axes to various angular positions ． Another category of horizontalspindle machines is turning centers , which are putercontrolled lathes with several features ． A threeturret puter numericalcontrolled turning center is shown in Fig． 4． 8． This machine is designed with two horizontal spindles and three turrets equipped with a variety of cutting tools used to perform several operations on a rotating workpiece ． Universal machining centers are equipped with both vertical and horizontal spindles ． They have a variety of features and are capable of machining all surfaces of a workpiece (vertical , horizontal , and diagonal ) ． Characteristics and Capabilities of Machining Centers The following are the major characteristics of machining centers : ? They are capable of handling a variety of part sizes and shapes efficiently , economically , and with repetitively high dimensional accuracy 。 they collect chips along the two troughs and deliver them to a collecting point ． Other systems may use chaintype conveyors ． Machinetool Selection Machining centers can require significant capital expenditures , so to be cost effective , they generally have to be used for at least two shifts per day ． Consequently , there must be sufficient and continued demand for products made in maching centers to justify this purchase ． Because of their inherent versatility , however , machining centers can be used to produce a wide range of products , particularly with justintime manufacturing ． The selection of the type and size of machining centers depends on several factors , among which are the follwing : ? The type of products , their size , and their shape plexity ? The type of machining operations to be performed and the type and number of cutting tools required ? The dimensional accuracy required ? The production rate required Although versatility is the key factor in the selection of machining centers , these considerations must be weighed against the high capital investment required pared to the costs of manufacturing the same products using a number of more traditional machine tools ． Basic Operation of NC Machining Centers Manual Operation of Machining Centers Manual operation involves JOG and MDI. 1) Jogging control JOG method After turning the machine on, press “jogging” key on the machine control panel and thoose JOG operation mode. If JOG state interface appears on the screen, then the adjustment for the spindle worktable location can be performed. 畢業(yè)設(shè)計◆英文翻譯原文 第 5 頁 共 6 頁 2) Manual control MDI method.
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