Linkage type step hole inner expansion mandrel clamp used for numerically controlled lathe

Abstract

The invention relates to a linkage type step hole inner expansion mandrel clamp used for a numerically controlled lathe. The linkage type step hole inner expansion mandrel clamp comprises a support shaft (4), two taper nuts which are oppositely installed on the support shaft (4) at intervals in a threaded manner, and a floating expansion sleeve (6) which is used for tensioning and fixing a part (7) to be machined, the two ends of the floating expansion sleeve (6) are floating end parts (61) with telescopic outer diameters, circular-truncated-cone-shaped holes which are matched with the tapersof the outer surfaces of the taper nuts are machined in the inner sides of the floating end parts (61), and the two taper nuts correspondingly stretch into and abut against the inner wall faces of thecircular-truncated-cone-shaped holes in the two floating end parts (61) respectively, so that the floating expansion sleeve (6) is fixedly arranged on the supporting shaft (4) in a sleeving mode. Compared with the prior art, the linkage type step hole inner expansion mandrel clamp used for the numerically controlled lathe can cooperate with the numerical control lathe, so that turning machining the two end faces and a outer circle of the part at a time is completed, the very high parallelism of the two end faces and the very high perpendicularity of the two end faces and the outer diameter are further guaranteed, and the machining process is flexible and convenient.

Description

technical field [0001] The invention belongs to the technical field of key components of numerical control machining, and relates to a linkage-type step hole internal expansion mandrel clamp for a numerical control lathe. Background technique [0002] At present, for stepped hole pipe parts with coaxiality requirements for the stepped inner hole and outer diameter, how to ensure that the inner holes at both ends and the processed outer diameter meet the higher coaxiality requirements at the same time has always been a problem faced by the industry. There are two methods: one is to process the outer circle on the lathe first, and then clamp the outer circle to process two stepped holes at one time; the other is to use the machining center to process with a four-axis boring tool. The method needs to use the outer diameter to transmit the clamping accuracy. Due to the clamping error, it is necessary to make a meter to find out. The efficiency is extremely low and the quality is...

AI Technical Summary

Problems solved by technology

[0002] At present, for stepped hole pipe parts with coaxiality requirements for the stepped inner hole and outer diameter, how to ensure that the inner holes at both ends and the processed outer diameter meet the higher coaxiality requirements at the same time has always been a problem faced by the industry. There are two methods: one is to process the outer circle on the lathe first, and then clamp the outer circle to process two stepped holes at one time; the other is to use the machining center to process with a four-axis boring tool. The method needs to use the outer diameter to transmit the clamping accuracy. Due to the clamping error, it is necessary to make a meter to find out. The efficiency is extremely low and the quality is very unstable. It is not suitable for large-scale stable production, and the watch can only be found out to the outside without clamping. part, the clamping part cannot guarantee the coaxiality, so the accuracy is not high, and for thin-walled parts due to poor support strength, the outer circle of the clamping is prone to triangular deformation, and the accuracy is difficult to guarantee

The second method needs to invest in four-axis processing equipment, the cost of equipment and man-hours is high, the boring efficiency is lower than that of lathes, and the accuracy is not as good as that of lathes, and the adjustment of boring tools is more troublesome than directly changing tools on lathes, and the economy is not good. At the same time, due to the problem of repeat positioning accuracy of four-axis rotation, it is still difficult to guarantee coaxiality for products with high precision

Conventional expansion mandrels have strict requirements on the dimensional tolerance of the inner hole clamping place, each mandrel can only adapt to a small range, poor versatility, and high cost

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