角形軸承座的工藝和銑寬50槽夾具設(shè)計【角形軸承箱】

喜歡就充值下載吧。資源目錄里展示的全都有，下載后全都有,請放心下載，.dwg格式文件為原稿CAD圖紙，可自行編輯修改【QQ：1304139763 可咨詢交流】=喜歡就充值下載吧。資源目錄里展示的全都有，下載后全都有,請放心下載，.dwg格式文件為原稿CAD圖紙，可自行編輯修改【QQ：1304139763 可咨詢交流】=喜歡就充值下載吧。資源目錄里展示的全都有，下載后全都有,請放心下載，.dwg格式文件為原稿CAD圖紙，可自行編輯修改【QQ：1304139763 可咨詢交流】= Course No.: Student No.：Course Project :Manufacturing Technology DesignTitle Machining process specification and technological equipment of shell parts Student Name 屠奇瑤 Class Mechanical Design 、Engineering and Automation (English)151 Student No. 201535510108 Department/College Engineering Institute、Vocational and technical education Institute Advisor Dr. Wang Date 2018.11.09 II Course Project: Manufacturing Technology Design Design Instruction on Course Project:Manufacturing Technology DesignDesign Assignment Title：Machining Process Specification of Shell Parts and Special Clamp for Milling Two Side Faces Process Content：1) Manufacturing process planning sheet12) Assembly drawing of Fixture or jig1 3) Detail drawing 1 / part4) Design Instruction1 Student Name Tu Qiyao Class Mechanical Design 、Engineering and Automation (English)151 Student No. 201535510108 Department/College Engineering Institute、Vocational and technical education Institute Advisor Professor Wang Date 2018.11.09 Course Project: Manufacturing Technology Design ContentContent3Abstract3Chapter 1 process analysis of parts51.1 Part action and structure51.1.1 function of parts51.1.2 structural features of parts61.2 key surface technical requirements for parts6Chapter 2 process planning design72.1 selection of blank and size determination72.2 preparation of process routes82.2.1 selection of crude and fine benchmark82.2.2 surface processing methods82.3 preparation of machining program9Chapter 3 Manufacturing process planning10Chapter 4 Jig/Fixture design114.1 Design duty124.2 Locating datum124.3 Fixture program12Chapter 5 Clamping force calculation135.1 Fixture design135.1.1 locating and clamping of the workpiece145.1.2Milling slot 10 mm wide155.1.3 Calculation of clamping force16Chapter 6 error analysis18Chapter7 Fixture design and usage of equipment197.1design of knife device197.2instruction of clamping operation19Chapter 8 Conclusion21References22Thanks24 AbstractMachining manufacturing is a basic discipline of mechanical specialty, which is widely used in practice.This design is aimed atthe design of the manufacturing process flow of the bearing seat of the part, and the special fixture design for this part. This paper introduces the whole processing process of this part product in detail. Through analyzing the technical requirements of the part, the degree of processing required for each machining surface is determined, the processing process scheme is reasonably determined, and the process card and process card of machining process are formulated. The special fixture is designed for two main processes.According to the existing condition, in the process of technological design in the traditional mechanical processing, process planning formulation needs according to the characteristics and the structure of the parts are processed performance requirements, and then according to the reality of the conventional processing route to carry on the processing and manufacturing, so that better product quality and technical performance to ensure that the parts, but also embodies the parts processing characteristics of the product.In addition, in the design of special jig, special jig that conforms to the actual processing conditions is adopted for the main processes, which saves the processing time and improves the labor efficiency. Although the cost of processing is slightly increased, it is more conducive to the replacement and maintenance of the jig later and increases the utilization rate of materials.Keywords: bearing housing; Fixture design; Process planning designChapter 1 process analysis of parts1.1 Part action and structure1.1.1 function of partsThis part is the bearing seat. The bearing seat is usually installed on a machine tool. The corresponding connecting hole of the bearing seat is connected with the corresponding connecting screw rod or connecting shaft.1.1.2 structural features of partsFrom the perspective of shape, this part is relatively standard. The main part structure includes the main processing features of the large hole in the center, and the processing features to be carried out by two side planes.1.2 key surface technical requirements for partsTo processing some of the surface of the bearing parts, mainly including its face and wide groove on the surface of the upper and the lower right side of the face and on the lower right side end face of wide groove, on his men along the surface and the lower left along the surface, phi before and after the end of 250, the surface characteristics of phi 250 before and after the end of the surface roughness request for Ra6.3, two parts of 50 h11 require wide groove is also Ra6.3, in addition to the rest of the state that the surface roughness of the requirements are Ra12.5 did not indicate the surface roughness were not processed.The characteristics of the hole include that the large circular hole on the central datum is generally 180H7, the surface roughness of the hole is required to be Ra1.6, the surface roughness of the upper and lower right holes is required to be Ra12.5, and the surface roughness of the upper and lower right holes is required to be Ra12.5.The vertical degree between the middle and upper end face and the right lower end face is required to be 0.12mm, while the center large circular hole is required to be 0.008mm.Chapter 2 process planning design2.1 selection of blank and size determinationThe correct selection of blank has a very important influence on the subsequent processing. For the raw materials and manufacturing methods of the blank, the manufacturing precision of the blank also has a significant influence on the subsequent processing quality of the workpiece.Therefore, it is very important to determine the manufacturing form of the blank. This time, the bearing seat is considered to be mass production, and the blank is determined to be HT200 according to the shape of the parts. This time, the material is gray cast ironAccording to the mechanical manufacturing technology foundation course design guidance tutorial on casting blank, choose the parts of the surface of the basic characteristics of the casting blank and machining of the net size relative to consider machining allowance, query the book table 2 to 25, draw a plane machining allowance, the thickness of surface is greater than 50 mm, width is between 200 and 400 mm, so rough machining allowance of 2.5 mm, half finishing allowance of 1.5 mm, on end face and lower end face similarly also according to the rough machining allowance of 2.5 mm. When the center hole is roughmachined to 3mm, the semi-finishing to 2mm and the finishing to 1.0mm, it is concluded that the size of the blank of the center hole which is join180-3-2-2-1 is equal to join168.The thickness of the blank is 100+2.5+1.5+2.5+1.5=108mm.2.2 preparation of process routes2.2.1 selection of crude and fine benchmarkWhen the parts are processed, the rough benchmark for starting the processing should be considered generally. Basically, the rough benchmark can choose the shape feature that is not processed. Obviously, the large front and rear end face can be selected as the choice of the rough benchmark. The selection of fine datum needs to select the basic datum features after processing. In this case, center big hole and front and rear large end face can be selected as the selection of fine datum.2.2.2 surface processing methodsIn terms of the basic features of the bearing pedestal parts this time, it is mainly the processing of the basic features of the surface and bore. Basically, the milling process can be selected based on the processing method of the surface. Rough milling is adopted for the roughness machining surface of R a12.5; rough milling and semi-fine milling are used for Ra6.3; rough milling and fine milling are used for Ra3.2 and Ra1.6. The hole is 180 adopted rough, semi-fine boring, fine boring all can achieve the requirements.2.3 preparation of machining programThe starting point of the process route. The technical requirements such as geometrical shape, dimension accuracy and position accuracy of the parts should be reasonably guaranteed. In the production program, the conditions for mass production should be determined, and special jigs should be used in general machine tools, and as much as possible, to improve productivity. The processing route of the current bearing housing is as follows:Operation numberNameoperation10CastingCasting the blank type20MillingMilling the bottom surface30MillingMilling the upper surface40MillingMilling two side surfaces50MillingMiling groove side60DrillingDrilling holes of the sides surface70BoringBoring bearing holes roughly(180mm)ChamferingChamfering80BoringFinishing boring bearing holes90MillingMilling inner small end face100DrillingDrilling holes of the infront surface110Curettage cavity120Washing130testingChapter 3 Manufacturing process planningThe first step in the process is to select the location reference.For the positioning reference selected can ensure the whole machining process smoothly,usually how to process the surfaces should be first considered,and then consider how to choose the rough datum as the surface of the precise datum to process first. 1Selection of precise datumThe bottom surface and holes 6-11 are not only the assembly standard,but also the design datum.Using them to do precise datum can make the processing follow the principle of datum coincidence,and realize the typical positioning method of one side,one holeof the box parts.The processing of the remaining surfaces and holes can also be positioned with it,so that the process route respects the principle of benchmark unification.In addition, the bottom surface area is relatively large,so that the location is relatively stable,and the clamping scheme is relatively simple, reliable and easy to operate. 2Selection of rough datumAccording to:On the premise that all processing surfaces are guaranteed to be machined, the machining allowance of the important holes shall be as uniform as possible;A rotating part (such as a gear, shaft sleeve, etc) that fits into a casing and has sufficient clearance from the inside of the case;Assure exact location and Reliable clamping.In this case, the two wide slots of the bearing seat, namely the upper wide slot of the workpiece and the right wide slot, have the same characteristics. In the process of clamping their wide slots, consider using a universal method, so that this fixture can be used to process the wide slots of the two parts.The choice of positioning scheme is: to the center circle hole phi 180 for a basic positioning base, the center circle hole can limit the workpiece four degrees of freedom, in addition to large end face can restrict the artifacts of a degree of freedom, in addition to prevent the workpiece, the choice to phi 25 hole for a benchmark limit freedom of its side, it is restricting the whole workpiece is completely at six.Chapter 4 Jig/Fixture designIn order to improve labor productivity, guarantee the quality of processing and reduce the intensity of labor, special jigs should be designed when machining the parts.The design of the fixture adopts a hinged connection, so it is time-consuming and laborious to clamp and release the workpiece. But because of its small size, the workpiece is easy to cut. Through the careful analysis and comparison of the scheme, the hinge type is adopted. This kind of clamping mechanism is simple in structure, reliable in clamping and large in versatility. It is widely used in machine tools and Fixtures.4.1 Design dutyThe location mode of milling two side surfaces is easy, but it still needs to limit six degrees of freedom. In order to ensure technical requirements, the key is to find the positioning datum. At the same time, we should consider how to increase labor productivity and reduce the intensity of labor.4.2 Locating datumAccording to the part drawing, the two side surfaces are perpendicular to the bottom surface, and before processing the side surfaces, the bottom surface has already been finished processed. So we choose the bottom surface as the positioning base datum(design dutam) to satisfied the requirements of vertical tolerance.4.3 Fixture programThe starting point of designing the special fixture should be to ensure the geometry, dimension precision and position precision of the parts. In the production program has been identified as a large number of production conditions, the special fixture design should make the process convenient in clamping, and have high production efficiency.Chapter 5 Clamping force calculation5.1 Fixture designThe fixture is as followed.5.1.1 locating and clamping of the workpieceThe workpiece is clamped on the clamp. Six degrees of freedom are limited by two bearing plates and two supporting seats, namely one side and two supporting seats.The screw and knob nut are used to clamp the workpiece. The clip has a u-washer and knobs for easy removal and adjustment.5.1.2Milling slot 10 mm wideMachine tool: milling machine X53KCutter: high - speed steel keyway milling cutter number of teeth Z=6Amount of feed f: according to the machinery manufacturing technology basic course design guide table 5-15, take Cutting speed V: refer to table 5-15 of mechanical manufacturing technology basic course design guide Machine spindle speed: Milling keyway to calculate, milling basic time formula as followsType in theThe cutting length of the workpieceCutting length: calculated according to 25mm,The cutting length of the cutter: take, and choose 2mm this time: table level feedMobile time5.1.3 Calculation of clamping forceThe clamping of the part is directly clamping the end face of the part.According to the formulaIn the type: actual clamping force N requiredF: the cutting force(1) calculation of cutting forceThe cutting force is milling force, then the cutting force is milling forceFormula is as followsType in theF: cutting force N: consider the type coefficient of workpiece material milling cutter when milling HSS milling cutter, and check the table: milling depth mmD: diameter of milling cutter is mm: mm feed per toothB: milling width mmZ: the number of teeth of the milling cutter: the correction coefficients of different mechanical properties of workpiece materials are taken into account when milling HSSThe cutter diameter according to end face milling cutter phi 50 mm, cutter feed per tooth choice for = 0.1 mm, the width of the milling length is the length of 170, so B = 170 mm, the number of teeth on the cutter phi 50 of 8, then Z = 8, milling depth = 1.5 mm, according to the specifications of rough milling of milling cutter and milling bearing material is carbon steel material, the index of = 294, = 1Plug in type= 1595 nSo the cutting foce F=1595Since K the safety factor is 1.5So the clamping force is Chapter 6 error analysisIn the special fixture for milling groove this time, the main positioning datum is the central large circular hole with the large end surface. Please analyze the error analysis of this main positioning.When any side contacts (the pin is placed vertically)In the type : the minimum clearance between the locating hole and the locating pinIn this case, a hole and a plane are positioned in the form of any side contact and the positioning error formula of any side contact is adoptedIn this case, the tolerance of the part hole of x 180H7 was z 180, so =0.04The locating axis of the smu160 tolerance is 100. so =-0.04Chapter7 Fixture design and usage of equipment7.1design of knife deviceThe tool alignment device is composed of the tool alignment block and feeler gauge, which is used to determine the relative position of the cutter and fixture.Since this procedure is to finish rough milling and fine milling of the broad groove of the bearing seat, and because the wide groove is to be machined on the surface with depth, right-angle tool blocks are selected.The clamping block installed on the jig can make the jig work well before the processing of a batch of parts.Select the machined surface to be higher than the height of the blade piece (1-2mm).7.2instruction of clamping operationThe clamping method of milling groove clamp is to use end face for clamping, and the action of using circular nuts on both sides of end face for clamping is used. The slot milling jig is applicable to the wide slot milling fixture on the two parts, in the first such as wide groove is part of the wide groove processing is completed, at this time will be the upper round nut loosen the lock, pull out the right positioning of the limit pin, remove artifacts and flip, at this time will be lower right part of the wide groove to the horizontal upward direction, and then on the left there is a limit pin of the device, same aim the limit pin also on phi 25 on the part of the wide slot hole, will limit pin inserted into the hole, then round nut locking, this time can be processed to a wide on the right side of the slot, so the material both wide groove can be done in a special jig jacket, The purpose of fixture design is achieved.The following is the assembly drawing of the entire clamping fixture with the bearing seat milling wide groove.Assembly drawing of a wide groove fixture with a bearing seatChapter 8 ConclusionThe fixture design process is a relatively comprehensive summary of systematic knowledge. After the whole process, I think the power platform of knowledge is great, and a lot of knowledge points that were not noticed in the textbooks before are reflected in this design process. At first not much for design concept, basically all dont know how to begin, slowly for a period of time after the early stage of the knowledge of the query and the analysis of the case, especially used to go to the school library to found a lot of data, especially on those parts of the case, books have all kinds of fixture case in this regard, after detailed understanding and analysis, are basically has a degree of certainty, familiar with the various steps and design process of the structure, and also the field to a lot of physical structure of the clamp design base to understand it, a detailed know all kinds of fixture parts installation location, And during the processing, the specific action process of these parts, after learning from the on-site masters, gradually had a certain concept. These are a more detailed preparation work of my