Home>Bearing knowledge>Spherical processing skills in deep holes

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Deep hole spherical machining skills

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The data is 1Cr18Ni9Ti; welding layout parts. Although the workpiece data strength is not high; but the plasticity and resistance are large; the machinability is poor; the work hardening tendency is fierce; the cutting load is large; the thermal conductivity is poor; the heat is easily collected on the cutting edge during processing; Debris; increase the wear of the tool. The first difficulty in machining is high precision of the workpiece; thin wall; poor rigidity; simple deformation caused by clamping. The hole depth of the workpiece is blind hole; the bottom of the hole is spherical; the shank is slender; Easy to oscillate. Processing quality is not easy to ensure.
The process profile is originally processed on a CNC lathe; the finishing needs to complete the turning of the inner hole and the inner spherical surface once; the tool change is not allowed during the machining process. According to the processing characteristics of the CNC machine tool; the diameter of the tool bar can only be f60mm. Because the arbor is slender; the rigidity is lacking; the strength is low; the shank oscillation is large during processing; the appearance of the knives occurs; and the roughness of the hole wall is increased; not only the production power is low; and the processing quality is difficult to ensure.
If the diameter of the arbor is increased; when the inner hole is machined; the gap between the arbor and the hole wall is too much. 鹋 疾 怀 辉 辉 啥 啥 啥 啥 啥 啥 啥 啥 啥 啥 啥 啥 啥 啥 啥 啥 啥 啥 啥 啥 啥 啥 啥 啥为了. In order to satisfy the demand for production; to make the processing quality of the workpiece stable; to improve the production power; to deal with the lack of deep hole in CNC lathe processing; to describe a special tool for turning the spherical surface in deep hole; it can be deep hole in ordinary lathe Processing of the spherical surface.
Tool description and depiction of special tools should be able to smoothly discharge the chips; improve the strength and rigidity of the tool bar; prevent the oscillation of the tool bar during machining; ensure the machining accuracy; and complete the rotation of the tool; reach the function of the spherical surface in turning .
The special tool for turning the spherical surface in the deep hole is mainly composed of a cutter bar, a knife seat, a sealing plate, a drawbar shaft, a connecting rod, a rotating body, etc. The cutter bar, the knife seat and the sealing plate are welded into a rigid body; the pull rod shaft can be in the tool holder and The inner hole of the sealing plate slides freely. The pull rod shaft and the connecting rod; the connecting rod and the rotating body are connected through the pin shaft; the rotating body and the tool holder are connected through the positioning shaft and the sleeve, and the sliding joints are selected between the connecting members.
In order to prevent the spherical surface during turning, the link mechanism presents a dead point; when assembling a special tool, the rotating body should be deflected forward by one viewpoint.
Processing method After the workpiece is welded, the internal stress is removed. After the inner hole and the outer circle of the roughing machine, the alignment reference is established on the flanges of the two ends of the workpiece. The problem of poor rigidity of the workpiece is prevented; the deformation of the clamping is prevented; the workpiece passes through the positioning tool and The intermediate frame is fixed.
Use the chuck to position the tooling card. The coveted 庠 庠 庠 涑 ㄎ ㄎ ㄎ 诤螅 诤螅 诤螅 诤螅 弥 弥 弥 弥 弥 ぜ寐菟 ぜ寐菟 ㄔ诙ㄎ ㄔ诙ㄎ ㄔ诙ㄎ ㄔ诙ㄎ ㄔ诙ㄎ ㄔ诙ㄎ ㄔ诙ㄎ ㄔ诙ㄎ ㄔ诙ㄎ ㄔ诙ㄎ ㄔ诙ㄎ ㄔ诙ㄎ ㄔ诙ㄎ ㄔ诙ㄎ ㄔ诙ㄎ ㄔ诙ㄎ ㄔ诙ㄎ ㄔ诙ㄎ ㄔ诙ㄎ 15 15
The special tool is mounted in the tool holder; the special tool is fixed by the open slot of the tool holder; and the tool holder is fixed on the tool holder of the lathe. The connecting seat is fixed on the end surface of the tailstock shaft; The shaft is hinged to the adapter through the positioning pin.
When turning the inner spherical surface; changing the operating handle of the lathe tailstock; using the axial movement of the tailstock sleeve; moving the tie rod shaft in the axial direction through the adapter seat fixed on the tailstock sleeve; the pull rod shaft propelling the connecting rod; The turning tool on the rotating body rotates around the positioning axis; then the turning of the spherical surface in the deep hole is completed.
When turning; the tool is punched at the workpiece hole; the inner hole and the inner spherical surface can be manipulated. The depth scale is measured by the inner depth of the workpiece and the scale value of the large pallet of the lathe.
The cooling lubricating fluid is selected from the vulcanized cutting fluid. The conveying pipe of the cooling liquid passes through the arbor and is fixed on the turret; the cooling lubricating liquid is sprayed directly from the turret to the turning tool; and the swarf is punched out from the inner hole of the workpiece.
In order to prevent the chips from being wound around the turning tool; the wall of the hole is pulled; the appropriate chip breaking groove is ground on the turning tool according to the cutting amount during the finishing of the car;
When finishing the car, the blade data is YW1; the spindle speed is 20r/min; the feed rate is 0.15mm/r; the knife depth is 0.25mm. The sharpness of the tool should be adhered to; the strength of the cutter head should be enhanced; the heat dissipation condition should be improved; The resulting work hardening tendency; the turning tool should also have a reasonable cutting point of view.
Investigate the shape and color of the chip at any time during processing; pay attention to the condition of chip removal; and the movement announced by the tool in the deep hole during machining; investigate the oscillation condition by touching the tool bar by hand. If the abnormal appearance is present; it should be checked immediately; Ways to deal with it.
The conclusion is that the special tool is passed on the ordinary lathe; the turning of the spherical surface in the deep hole is completed. Not only the production power is high; the processing cost is reduced; and the processing quality can be ensured.
The special tool layout for processing the spherical surface in the deep hole is simple; easy to use; the processing scale can be adjusted; the applicable range is large. It can be referred to for the similar problems of disposal.

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