机械制造技术英文PPT (3).ppt

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1、MechanicalManufacturingTechnologyMachine tool fixture overviewu1、Composition of machine tool fixtureLocator:determine the position of the workpiece in the fixtureClamping device:clamp the workpieceTool setting and guide element:determine the position of the tool relative to the fixture positioning e

2、lementOther devices:such as indexing components,etc.Connecting elements and connecting surfaces:used to determine the position of the fixture itself on the machine tool spindle or tableClip specific:used to connect various components and devices on the fixture into an organic wholeFigure 1 Milling s

3、haft end slot fixture1-V-block;2-Supportsleeve;3-handle;4-Directionalkey;5-Clamp;6-ToolblockFig 2 Milling shaft end slot fixture1-Directional key;2-Support sleeve;3-spring;4-Clamp;5-Tool block;6-V-block;7-Briquetting;8-Guide post;9-Eccentric wheel;10-handleIndexing platePositioning mandrelClamping n

4、utSplit washerDrill sleeveratchetpawlFolder specificConnection surfacelocatorsclamping deviceGuide elementIndexing deviceFig 3u2、Fixture classificationFixtureFixturemachine tool inspection assemblyweldingothers（Classification by process）a）by the types of machine toolsb）the clamping power sourcec）the

5、 versatility of the structureLathe fixtureMilling fixtureGear machine bed fixtureManual fixtureHydraulic fixturePneumatic fixtureElectric fixtureMagnetic fixtureVacuum fixture（1）General-purpose fixture refers to a fixture that has been standardized and can be used to process different workpieces wit

6、hin a certain range,such as a three-jaw chuck,flat jaw,universal indexing head,etc.According to the scope and characteristics of applicable workpieces,it is divided into general fixtures,special fixtures,combined fixtures and adjustable fixtures;according to applicable machine tools,it is divided in

7、to lathe fixtures,milling machine fixtures,drilling machine fixtures,boring machine fixtures and CNC machine tool fixtures;Manual fixture,pneumatic fixture,hydraulic fixture,pneumatic fixture,electromagnetic fixture,self-tightening fixture,etc.（2）Special-purpose fixture refers to a fixture specially

8、 designed for a certain machining process of a workpiece.（3）Combined fixture:It consists of a set of pre-manufactured standard components(different from the standard components of special fixtures)or joints with different shapes,different sizes,complete interchangeability,high precision and high wea

9、r resistance,according to different The process requires rapid assembly into the required fixture.After use,it can be easily disassembled into components or joints,and reassembled into fixtures for other processing when needed.（4）Adjustable fixtures:including universal adjustable fixtures and group

10、fixtures,they can process a certain range of workpieces by adjusting or replacing a small number of components,and have the characteristics of special and universal fixtures.The applicable scope of the universal adjustable fixture is wide,and the processing object is not very clear;Figure 4 General-

11、purpose fixtureThree-jawchuckFour-jawchuckUniversalflatnosepliersRotarytableIndexingheadCharacteristics of various machine tool fixturesGeneral-General-purpose purpose fixturefixtureSpecial-Special-purpose purpose fixturefixtureSpecially designed for a certain process,compact structure,convenient op

12、eration,high production efficiency,easy to ensure processing accuracy,suitable for batch and mass production of shaped products.Combined Combined fixturefixtureAdjustable Adjustable fixturesfixturesIt does not correspond to a specific processing object and has a wide range of application.By appropri

13、ately adjusting or replacing individual components on the fixture,it can be used to process a variety of workpieces with similar shapes,sizes and processing techniques.Group fixtureGroup fixtureSpecially designed for the group processing of a group of parts,the processing object is clear and targete

14、d.Through adjustment,it can adapt to various processes and processing shapes and sizes.Strong versatility,widely used in single-piece small batch productionA special fixture assembled from a set of pre-manufactured standard components and assembliesu3、Function of machine tool fixturepGuarantee processing qualitypIncrease productivity and reduce production costspReduce the labor intensity of workers and ensure safe productionpCan expand the scope of machine tool technologypCan be processed by workers of lower skill levelThank you!