Movable support for boring holes of large diameter and length on lathes

Abstract

Movable support for boring holes of large diameter and length on lathes consists of a mandrel, a fork that grips the boring tool holder on three sides, a housing with a hole, and support elements in the form of a set of telescopic cylinders with locking screws. The housing has a splined hole. The mandrel of device has external splines located tangentially to the splined hole of the housing.

Description

The utility model belongs to the field of mechanical engineering, namely to metal cutting and can find application in machining deep holes of large diameters on lathes. A moving steady rest for lathes is known [Handbook of the toolmaker-designer, V. I. Baranchikov, Moscow, Mashinostroenie, - 1984, - p. 157.], which has a body with supporting elements in in the form of cams and is used as an additional movable support for a non-rigid part during mechanical processing. A movable steady rest for boring holes of large diameters and lengths is also known. lathes [Patent 85983 Ukraine, MPK B23B1 / 00. Movable steady rest for boring holes large diameters and lengths on lathes / V.V. Khoroshailo. - No. u201306935, applied for 03.06.2013; published 10.12.2013, bulletin No. 23 / 2013], chosen by us as an analogue that has the corpus with supporting elements in the form of a set of telescopic cylinders with fixing screws, mounted on a mandrel, the body has flat guides and a fork that covers the boring bar holder cutter on three sides, and the mandrel of the device has flat surfaces tangent to the guides of the body. The common essential features of the known device and the utility model are a mandrel, a plug, which covers the boring tool holder on three sides, a housing with a hole and support elements in in the form of a set of telescopic cylinders with locking screws. The disadvantage of the known device is the difficulty of ensuring the required level of centering of the mandrel with housing, which can cause jamming during longitudinal movement. The utility model is based on the task of improving a known device to provide the required level of centering of the mandrel with the body. The problem is solved by the fact that in the movable support for boring holes of large diameters and lengths on lathes, containing a mandrel, a fork that covers the holder boring cutter on three sides, housing with hole and supporting elements in the form of a set telescopic cylinders with locking screws, according to the utility model, the housing has a splined hole, and the mandrel of the device has external splines tangent to the spline hole of the housing. The essence of the utility model is explained by the drawings. Fig. 1 - diagram of a movable steady rest for boring large diameters and lengths on lathes machines. Fig. 2 is a section along AA. The device includes a housing 1, which has a slotted hole 2, as well as a support element in the form of a set telescopic cylinders 3 with locking screws 4, connected to a fork 5 that covers the holder boring cutter 6 on three sides and mandrel 7, which has external splines tangential to the spline hole 2 of housing 1. Mobile support for boring holes of large diameters and lengths on lathes works like this. The workpiece is installed in the jaws of the faceplate 10 of the lathe (not shown in the drawing). marked). A mandrel 7 passes through the hole in the workpiece, which is rigidly fixed on one side conical shank in the tailstock quill 8, and on the other side the mandrel is supported by the center hole on the center 9, which rotates. The center 9 is installed in the conical hole of the lathe spindle machine. The boring tool holder 6 is fixed in the tool holder. Behind the cutting part The boring tool holder is fitted with a fork 5, which covers the boring tool holder. cutter from three sides. The fork 5 is fixed with a screw to the cylinder of the set of telescopic cylinders 3, which in turn, are fixed to the device body 1. Before machining the hole, the cutting depth is set by moving the boring tool holder 6 in the radial direction. Before this, release the fixing screws 4 and the telescopic cylinder set 3 together with the boring bar. The cutter is set to process a given diameter of the workpiece. After setting the required cutting depth tighten the locking screws 4, which ensures the necessary fixed position telescopic set of cylinders 3 in the radial direction. When machining a hole in the cutting process the workpiece rotates at a given speed, and the boring tool is moved longitudinally together with housing 1, using a movable spline connection. Using a movable support for boring holes of large diameters and lengths on lathes machine tools, which accompanies the cutter during the machining process and compensates for radial (Py) and circumferential (Pz) cutting force components, reduces bending and twisting of the boring tool holder, reduces the level of unwanted vibrations during processing, while ensuring a high level of centering mandrel with the body and stable longitudinal movement of the body along the mandrel.

Claims

Mobile support for boring holes of large diameters and lengths on lathes machine tools, containing a mandrel, a fork that covers the boring tool holder of three sides, a body with a hole and supporting elements in the form of a set of telescopic cylinders with fixing screws, which differs in that the body has a splined hole, and the mandrel The device has external splines tangent to the spline hole of the housing.

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