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1.Castings must not have defects such as blisters and pores. 2.Material: ZCuSn5Zn5Pb5. 3.All chamfering C1.
1.Part drawing analysis
1) This piece is a thin-walled bushing, which is characterized by a thin hole wall and high requirements for dimensional accuracy, geometric tolerances and surface quality.
2) The part material is ZCuSn5Zn5Pb5.
1) The inner hole of this part is the benchmark, the dimensional accuracy and surface quality are required to be high, and the hole wall is thin. During fine boring, use a special fixture to locate on the outer circle, and use a nut gland to axially press the end face of ϕ130 to make the clamping force act axially to avoid deformation of the inner hole.
2) In order to ensure the verticality of each end face of the bushing and the coaxiality between the outer circle and the inner hole, the workpiece should be installed on the mandrel, and the inner hole should be used as the positioning reference to grind the outer circle and end face.
Bushing machining process (Unit: mm)
|Part Name||Blank species||Material||Production type|
|Process||Work step||Process content||Equipment||Tools, measuring tools, auxiliary tools|
|20||Rough turning||Horizontal lathe|
|1||Use the self-centering chuck to clamp the outer circle of the blank, align, clamp, turn the end face, and turn it flat.||45° elbow turning tool|
|2||Turn ϕ105f7 × 34 to ϕ107 × 34||90° external turning tool|
|3||Turn φ130 to φ133||90° external turning tool|
|4||Drill hole ϕ90H6 to ϕ50||ϕ50 twist drill|
|5||Rough boring ϕ90H6 hole to ϕ88||Boring tool|
|6||Turn around, clamp the outer circle of ϕ105f7 with a soft claw, and turn the end face to ensure the total length 54||45° elbow turning tool|
|7||Turning ϕ105f6 × 12 to ϕ107 × 12||90° external turning tool|
|30||Fine turning||CNC lathe|
|1||Turn the left end face to the requirement, surface roughness Ra1. 6μm||35° turning tool|
|2||Turning ϕ105f7, leaving a grinding allowance of 0.40||35° turning tool|
|3||Turning size 34, left grinding allowance 0. 10||35° turning tool|
|4||Turning ϕ130 outer circle to requirement, surface roughness Ra3. 2μm||35° turning tool|
|5||Turning holes and outer chamfers C1||35° turning tool|
|6||Turn around. Turning the right end face, leaving a grinding allowance of 0.10, ensuring a total length of 50. 1||35° turning tool|
|7||Turning ϕ105f6, leaving a grinding allowance of 0.40||35° turning tool|
|8||Turning size 12, left grinding allowance 0. 10||35° turning tool|
|9||Boring the ϕ90H6 hole, leaving a grinding allowance of 0.40||Boring tool|
|10||Turning holes and outer chamfers C1||35° turning tool|
|40||Grind the inner hole||Internal grinding machine|
|1||Place the workpiece in a special fixture, position it with the outer circle and end face of ϕ105f7 × 34, press the nut on the left side of size 12 axially with the nut gland, and grind the ϕ90H6 hole to the required surface roughness Ra0. 8μm|
|2||Grind the right end face to the requirement, surface roughness Ra0. 8μm|
|50||Grind the outer circle||Cylindrical grinder|
|1||The work piece is sleeved on the taper mandrel, ground ϕ105f7 outer circle to the required surface roughness Ra0. 8μm|
|2||Grind ϕ105f6 outer circle to the requirement, surface roughness Ra0. 8μm|
|3||Rely on grinding size 34 on the right to the requirements, surface roughness Ra0. 8μm|
|4||Rely on grinding size 12 to the left to the requirements, surface roughness Ra0. 8μm|