角形軸承座的工藝和銑φ250前后大端面夾具設(shè)計【角形軸承箱】【三維SW】

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格式為CAD圖紙原稿可自行編輯修改【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格式為CAD圖紙原稿可自行編輯修改【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格式為CAD圖紙原稿可自行編輯修改【QQ：1304139763 可咨詢交流】= Contentscontent1Preface21. Analysis31.1 Part action31.2 Process analysis of parts3第2章 Process planning design42.1 Determining the manufacturing form of blank42.2 Datum plane selection42.3 Working out the process route42.4 Determination of machining allowance, process size and blank size52.5 Determining cutting parameters and basic working hours62.5.1 crude、Finish milling250 Front and rear end face62.5.2 crude、Fine boring 180H782.5.3Drilling reaming25102.5.4 Milling slot 10mm112.5.5 Drilling and expansion 6-1312第3 Fixture design for face milling143.1 Workpiece degree of freedom analysis and location principle143.3 Analysis of positioning error153.4 Calculation of cutting force and clamping force163.5 Brief description of fixture design and operation18Conclusion19Reference20 PrefaceThe fixture of machine tools is now very widely used in the current metal cutting process, it can be said that basically all of the mechanical processing will be more or less applied to fixture. The fixture is mainly able to accurately determine the position of the work piece, and the work piece can be firmly fixed and clamped, so as to facilitate cutting tools to meet the needs of processing. In other words, the main function of fixture is to ensure the quality of the work piece, improve the efficiency of processing, reduce the intensity of labor, can give full play to the performance of machine tools, so fixture in the current machinery manufacturing occupies a very important positionWith the great development of mechatronics, automation and artificial intelligence, the fixture used in the field of machinery has gradually evolved into a variety of forms, from the former manual fixture to the automatic assembly line fixture, and even to the present intelligent automatic fixture, the application of fixture is more and more people. With the development of industry, fixture will be improved and developed continuously to meet the needs of modern and diversified mechanical manufacturing productionFrom the actual development of machinery to the present, we learn the design of fixtures and mechanical manufacturing process knowledge, so that a good combination of the current mechanical manufacturing production, has a good learning effect, and can lay a certain foundation in the future development of mechanical manufacturing work, so familiar with the machine Machinery manufacturing technology and tooling and fixture design knowledge, for the future of mechanical manufacturing work has a great help, but also make their own step by step, gradually upgrade, for the motherlands mechanical manufacturing industry to contribute.第1章 Part analysis1.1 Part action This part is a bearing seat, bearing seat is generally installed on a machine tool, the bearing seat and the corresponding connecting holes connected with the corresponding connecting screw or connecting shaft, the center hole and the corresponding shaft bearing with each other, with the rotation of the shaft, to ensure that the center hole and the shaft have a certain concentric effect. 1.2 Process analysis of partsSome surfaces to be machined in this bearing seat part mainly include wide grooves on the upper end face and upper end face, wide grooves on the lower right end face and the lower right end face, opposite lower end face of wide grooves on the upper side, opposite end face of wide grooves on the right side, front and rear end face of 250, and so on. The front and rear end face of 250 is thick in these surface features. The roughness requirement is Ra6.3, and the width slot 50h11 requirement of the two parts is also Ra6.3. In addition, the surface roughness requirement of the other two parts is Ra12.5, and the surface roughness unmarked is not processed. The characteristics of the misalignment hole include the large circular hole_180H7 on the center datum, the surface roughness requirement of this hole is Ra1.6, the surface roughness requirement of 2-_25 holes on the upper wide groove and the lower right wide groove is Ra12.5, and the requirement of 6-_13 through holes on the large end face is Ra12.5. Form and position tolerance requires 0.12 mm perpendicularity between upper and lower right face, 0.008 mm roundness for center large round hole, 0.250 roundness for large end face, 0.4 mm positioning for center large round hole, 0.1 mm for front and rear large end face and 0.1 mm positioning for C reference center.第2章 Process planning design2.1 Determining the manufacturing form of blank Correct selection of blank has a very important impact on the subsequent processing, for the blank materials and manufacturing methods, also includes the blank manufacturing accuracy on the quality of the workpiece has a significant impact on the subsequentSo it is very important to determine the manufacturing form of the blank. This bearing seat is considered for mass production. According to the shape of the parts, the blank is HT200. This material is gray cast iron. It needs to use casting to make the blank. 2.2 base level selection processing.（1）Rough benchmark selectionThe basic roughness datum of the bearing seat parts can choose the shape of the workpiece. At the beginning, the front and back faces of the 250 large outer circles are used as the mutual roughness datum to process the front and back faces. Of course, the upper and lower ends of the parts can also be used as rough datum.（2）Precise reference selectionThe bearing seat parts of the choice of precision benchmark on the center of the large hole as a follow-up use of precision benchmark, such as the processing of its small hole and wide groove and so on can be used as a follow-up use of precision benchmark. 2.3 Working out the process routeIn view of this bearing seat parts, this time to determine the formulation of two process routes, and to compare and select the best choice. as follows（1）工藝方案一Process 1: casting blank Process two: rough and fine milling 250 front end face. Process three: rough and fine milling 250 100mm, ensure the size of the end Face. process four: center hole for rough and fine boring180H7 In placeProcess five: milling the upper end and the right side. Process six: milling upper and lower ends and lower right sides to ensure two parts size 50mm Process seven: milling the upper end and wide groove on the right side face to ensure the size 50mm Process eight: drill and expand 2- 25 holes. Process nine: drill 6- 13 holes. Process ten: deburring chamfering Process Eleven: Inspection and warehousing (2) process plan two Process 1: casting blank Process 2: rough and fine lathe 250 front end face. Process 3: rough and fine car, 250 rear end face to ensure size 100mm Process 4: rough and fine car center hole 180H7 in place. Process 5: the upper and lower right ends of the upper part of the milling machine ensure the size 50mm. Process 6: wide groove 50mm on upper and right ends of milling Process 7: drill and expand 2- 25 holes. Process 8: drill the 6- 13 holes on the big end surface. Process 9: deburring chamfering Process 10: Inspection and warehousing (3) comparative analysis of process plans We will analyze and compare the two process plans mentioned above. In the second scheme, the lathe is used to process the large end face and the large center hole. The lathe can be used to process, but the volume of the part is larger. Because the part is not similar to the shape of the revolving surface, it is necessary to consider the use of tooling fixture. This part has a larger volume and is put on the lathe. It is necessary to choose both large lathe and large fixture for machine tool processing. The installation time and the cost of using the machine tool are greatly increased. So the second scheme is not adopted, and the final scheme is the final processing scheme. 2.4 determination of machining allowance, process size and blank size. According to the material of bearing block, HT200 grey cast iron blank is adopted to determine the processing.Surface allowance, process dimension and blank size。1、250Front and rear end faceInquire about the planar machining allowance in Table 2-24 of Guidance Course of Basic Course Design of Mechanical Manufacturing Technology. This bearing sea250The surface roughness of the front and rear faces is required to be Ra6.3, which is achieved by rough and semi-finish machining. The thickness ranges from 50 mm to 100 mm. It is known that the rough machining allowance is 2.5mm on one side and the semi-finish machining allowance is 1.5mm on one side. such250 The blank size of the front and rear faces is 100+4+4=108mm.2、hole（）Inquiry Table 2-20 The maximum diameter of the bore of bearing seat center hole 180 before rough boring can be 170mm. Considering the use of a certain machining allowance, it is manufactured according to the blank size of 160 bore. 2.5 determine cutting parameters and basic working hours 2.5.1Rough, fine milling250 Front and rear end face（1）Rough millingProcessed part material：HT200Selection of machine tools：Vertical milling machineX53KTool selection：Sleeve end milling cutter，diameter 100mm，Number of teeth Z=10Milling depth ：Feed per tooth ：According to mechanical manufacturing technology basic course design guidance course table 5-5，take Milling speed: refer to table 5-11 of the course guide for mechanical manufacturing technology. Spindle speed of machine tool ：Feed rate ：Worktable feed per minute ：According to the basic milling time calculation in Table 5-47 of Guidance Course of Basic Course Design of Mechanical Manufacturing Technology, this is a nested face milling cutter. The basic milling time calculation formula is as follows式中工件的銑削長度刀具切入長度：In the form of For the nominal width of milling, query table 5-11 shows that the width of the face milling cutter diameter 100mm is 48mm：Diameter of milling cutter is 100mmAfter substituting the above formula，Obtain Cutting length of cutting tool ：取，This choice 3mm：Horizontal feed of worktable The number of steps is 1Maneuver time （2）Finish milling250 end faceMachined part material: HT200 Machine tool selection: vertical milling machine X53K Selection of tools: sleeve end mill, diameter 100mm, tooth number Z=10 Milling depth ：Feed per tooth: according to table 5-5 of course guide for mechanical manufacturing technology,Milling speed: refer to table 5-11 of the course guide for mechanical manufacturing technology. Spindle speed of machine tool ：Feed rate: ： Worktable feed per minute ：According to the basic milling time calculation in Table 5-47 of Guidance Course of Basic Course Design of Mechanical Manufacturing Technology, this is a nested face milling cutter. The basic milling time calculation formula is as followsIn the form ofMilling length of workpiece Tool cut in length ：In the form of Nominal width for milling，Query table 5-11 shows that the width of the face milling cutter diameter 100mm is 48mm The milling cutter diameter is 100mm After substituting the above formula，Obtain Cutting length of cutting tool ：取，This choice 3mm：Horizontal feed of worktable The number of steps is 1Maneuver time 2.5.2 Rough and precise boring 180H7 (1) rough boring to 179 Selection of high speed steel boring cutter The choice of rough machining is Feed rate reference refer to mechanical manufacturing technology basic course design guidance course table 5-36, take Referring to Table 5-1, cutting speed is obtained. Spindle speed of machine tool ：The cutting time is calculated according to the following formula.In the form of L: the length of cutting is 179mm. The actual length of the workpiece is 179mm ：Rough machining is selected as 2mmMain deflection angle ，that ，This selection 4mmThe number of times of feed is （2）Fine boringFeed inquiry refer to mechanical manufacturing technology basic course design guidance course table. 5-1，take Reference table for cutting speed 5-1，have to Spindle speed of machine tool ：The cutting time is calculated according to the following formula.In the form of L: the length of cutting is 180mm. The actual length of the workpiece is 180mmMain deflection angle ，that ，This selection 4mmThe number of times of feed is 2.5.3Drilling reaming 25（1）Drilling to20Feed rate: according to mechanical manufacturing technology basic course design guide course table 5-22，take cutting speed ：Refer to mechanical manufacturing technology basic course design guidance course table 5-22，takeSpindle speed of machine tool ：， The cutting time of drilling is calculated according to the following formula. In the form of The length of the cutting layer is ：according to the cutting depth, Tool cut in length ：Front corner of taper shank twist drill，Generally 118 degree，This calculation is based on 120 degrees. Cutting length of cutting tool ：，This is drilling through hole, according to 3mm. The number of times of walking is 1.Maneuver time ：（2）Reaming 25Feed rate ：According to mechanical manufacturing technology basic course design guidance course table 5-25，take cutting speed ：Refer to mechanical manufacturing technology basic course design guidance course table 5-26，take Spindle speed of machine tool ：， The cutting time of reaming is calculated according to the following formula. In the form ofLength of cutting layer ：According to the cutting depth, Tool cut in length ：Front corner of taper shank twist drill，Usually 118 degrees.，This calculation is based on 120 degrees. Cutting length of cutting tool ：，This is through hole.，According to 3mm The number of times of walking is 1.Maneuver time ：2.5.4 Milling slot 10mmMachine tool: milling machine X53KTool: high speed steel keyway milling cutter Tooth number Feed rate ：According to mechanical manufacturing technology basic course design guidance course table 5-15，take cutting speed ：Refer to mechanical manufacturing technology basic course design guidance course table 5-15，take Spindle speed of machine tool ：， The method of milling keyway is used to calculate the basic working hours of milling.式中Cutting length of workpiece Tool cut in length ：，according to 25mmCalculationCutting length of cutting tool ：take ，This choice 2mm：Horizontal feed of worktable Maneuver time 2.5.5鉆擴(kuò)6-13（1）Drilling to 10Feed rate ：According to the guidance course of mechanical manufacturing technology basic course design, table 5-22, cutting speed ：Refer to mechanical manufacturing technology basic course design guidance course table 5-22，takeThe cutting time of drilling is calculated according to the following formula.Spindle speed of machine tool ：， In the form of Length of cutting layer ：According to the cutting depth, Tool cut in length ：The front angle of a taper shank twist drill is usually 118 degrees, which is calculated at 120 degrees.Cutting length of cutting tool ：，This is drilling through hole, according to 3mm. The number of times of walking is 1. Maneuver time ：（2）Reaming 13Feed rate ：According to the guidance course of mechanical manufacturing technology basic course design, table 5-25, cutting speed ：Refer to table 5-26 of course guidance for mechanical manufacturing technology. Spindle speed of machine tool ：， The cutting time of reaming is calculated according to the following formula. In the form of Length of cutting layer ：According to the cutting depth, Tool cut in length ：Front corner of taper shank twist drill，It is generally 118 degrees, and this is calculated according to 120 degrees. Report errors Cutting length of cutting tool ：，This is through hole.，According to 3mm The number of times of walking is 1.Maneuver time ：. 3.1 milling fixture design. workpiece freedom analysis and positioning principle When milling the large front and rear end face of bearing base, the main positioning datum is the bottom face of the large end face. The main positioning datum based on the bottom face can select three degrees of freedom of the workpiece. The upper end face or the right end face can limit two degrees of freedom. The upper end face or the right end face can also be selected. It can limit the degree of freedom of its movement. The whole positioning principle follows the principle of six point positioning, and the following is a reference map. Fig. 3-1 six point positioning principle Locate the bottom three points by supporting pins to determine three degrees of freedom restricting X-direction rotation, Y-direction rotation and Z-direction movement, two points on the side to restrict X-direction movement and Z-direction rotation, and one point on the side of the vertical plane to restrict one degree of freedom restricting Y-direction movement, totally restricting six degrees of freedom.。圖3-2六點(diǎn)定位In the six-point positioning principle of supporting plate positioning, the two supporting plates on the bottom can limit three degrees of freedom of X-direction rotation, Y-direction rotation and Z-direction movement, while the supporting plates on the side can limit two degrees of freedom of X-direction movement and Z-direction rotation. The method adopted in this paper is basically in accordance with Figure 3-2. The difference is that when the large end face of_250 is considered as the positioning datum, four supporting nails are selected.，Among them, three supporting nails play the role of locating and restricting degrees of freedom, while the other supporting nails only play the role of strengthening strength. The upper end of one side uses a fixed supporting screw as positioning element, while the right end uses a movable handle to tighten the head of the screw to contact its surface, which limits a degree of freedom of its movement. 3.3 positioning error analysis One of the positioning methods of this time is that the right end and the lower end are two perpendicular planes. The positioning errors can be analyzed as followsError reporting Bilingual contrast Fig. 3-1 two vertical plane positioning Through two vertical plane positioning tolerance analysis, the following formula is calculated.This time Choose for 90 degree，Two dimensions of the side. and They were 30 and 35 respectively.，After substituting this formula Positioning error accounts for machining tolerances. ，Can ensure processing requirements.The positioning scheme can meet the accuracy requirement of machining.，The positioning scheme is reasonable.3.4 Calculation of cutting force and clamping force (1) calculation of cutting force The milling end is adopted, and the milling force is calculated according to the following formula. The milling cutter is cylindrical milling cutter, vertical milling cutter, disc milling cutter, saw blade milling cutter, angle milling cutter, semicircle shaped milling cutter. 式中：cutting force ：When milling with hi