RU2184014C2 - Apparatus for drifting deep holes - Google Patents

Abstract

FIELD: machine engineering, instrument making, mainly working deep holes, preferably with small diameters. SUBSTANCE: apparatus includes housing with opening for placing drift and pusher of its drive, secured to housing guiding device for pusher. Guiding device is in the form of several plates with central opening for pusher and with lugs arranged on end portions of plates and having holes for mounting each plate with possibility of engaging with two return springs. Columns guiding different plates are arranged in different planes passing through axis of pusher. In order to provide enhanced operational reliability apparatus is provided with sleeves pressed-in to each plates and made of elastic antifriction material. Openings of said sleeves are matched with above mentioned central opening for pusher to be mounted in said opening by interference fit. Return springs are mounted on two pins, one of said pins is secured to upper portion of columns, other pin - to lugs of plates. EFFECT: enhanced operational reliability. 2 dwg

Description

 The invention relates to metalworking, in particular to the processing of deep holes by burnishing.

 A well-known machine for hole drilling (USSR author's certificate 360175, class B 23 D 37/04. BI 36, 1972) containing a frame with a movable carriage located on it to accommodate parts and a mandrel and a rod interacting with the mandrel fixedly fixed on the frame, which is supported by several lunettes, each lunette is made in the form of two supporting thrust rollers and cams of levers, rotated by means of a pusher mounted on the carriage, acting on the thrust rollers and cams, respectively, with forward and reverse x odes of the carriage.

 A well-known machine for drilling holes (author's certificate of the USSR 428873, class B 23 D 37/04. BI 19, 1974) containing a frame on which is placed a movable table with a bar and a lance to support the latter, moving along the guides, and the lunette is made in in the form of at least two closed roller bearing thrust rollers, the internal branches of which interact with the rails mounted on the table, and the outer ones are rigidly connected to the carriage, which is located between the rails.

 A disadvantage of the known devices is the high complexity of the designs of the lunettes, consisting of many precise parts.

 A device for deep hole drilling is known (RF patent 2127654, class B 23 D 37/10, B 23 P 9/00, 24 V 39/02. Bull. 8, 1999), selected as a prototype, comprising a housing with a hole for placing the mandrel and the pusher of its drive and the guide device for the pusher mounted on the housing, made in the form of several plates with a central hole for the pusher and with bosses located at their ends with holes that each plate is freely mounted on two bosses rigidly fixed to the column body from cases, and nap different columns of the column are arranged in different planes passing through the axis of the pusher, and springs are mounted on the columns between the housing and the plates.

 A disadvantage of the known device is the presence of gaps between the pusher and the central holes of the plates, which leads, especially when burning holes of small diameter (1-3 mm), to the deflections of the pusher, an increase in the friction forces in the guide device, an increase in the wear of its parts and, in general, a decrease in reliability devices in operation.

 Another disadvantage of the known device is the placement of return springs on the columns between the plates and the housing in which the undercut for these springs are made. This leads to an increase in the thickness of the upper part of the housing, the length of the pusher and a decrease in its rigidity, which also reduces the reliability of the device in operation.

 The objective of the invention is to increase the reliability of the device in operation.

 The solution to this problem is achieved by the fact that the device for burning deep holes contains a housing with a hole for accommodating the mandrel and the pusher of its drive and a guide device for the pusher mounted on the body, made in the form of several plates with a central hole for the pusher and with bosses located at their ends with holes with which each plate is installed with the possibility of interaction with two return springs, and the guides of the different plates of the column are placed in different passing through es planes pusher axle. At the same time, it is equipped with bushings made of elastic antifriction material pressed into each plate, the hole of which is aligned with the said central hole for the pusher installed in this hole with an interference fit, while the return springs are mounted on two pins, one of which is mounted on the upper part of the columns, and another on the bosses of the plates.

 The essence of the proposed device is illustrated in the drawing, where Fig. 1 shows its general view, and Fig. 2 is a top view.

 The device consists of a housing 1 with a calibrated hole for accommodating the mandrel 2 and a pusher 3 fixed in the rod 4 of its drive by a screw 5. In the housing 1 there is a slot in which the workpiece 6 is installed, and a hole for the mandrel 2. To hold the mandrel 2 in in the extreme upper position, a spring-loaded lock (not shown) is provided in the housing. To guide the pusher 3, there are plates 7 with the bushings 8 pressed into them from elastic antifriction material, in which the pusher is mounted with an interference fit. The plates 7 at the ends contain bosses with holes with which they are freely mounted on the columns 9, 10, 11 and 12 pressed into the housing 1 (Fig. 2). Moreover, each pair of these columns supporting the plate 7 is placed in different planes passing through the axis of the pusher 3. On the pins 13 and 14, pressed into the upper part of the columns 9, 10, 11 and 12 and the bosses of the plates 7, respectively, return springs 15, 16, 17 and 18 are mounted.

 The device operates as follows.

 The workpiece 6 to be installed is installed in the slot of the housing 1 coaxially with the mandrel 2. When the actuator is turned on, the rod 4 overcomes the resistance of the springs 15, 16, 17 and 18 and the small friction forces that occur when the pusher 3 moves in the bushings 8, it sequentially shifts the columns placed on the columns 9, 10, 11 and 12 of the plate 7 with the bushings 8 down, and the pusher pushes through the hole of the workpiece mandrel 2, which falls into the hole in the housing 1. When moving the rod 4 with the pusher 3 up under the action of the springs 15, 16, 17 and 18 plates 7 with bushings 8 return march to their original position.

 Since in the proposed device the pusher is installed in the central (guide) hole with an interference fit, and the length of the pusher is reduced, its deflections are sharply reduced. Due to this, the reliability of the proposed device in operation significantly increases.

On the basis of the proposed device, a device for a pneumatic press was developed to ^{burn a} hole with a diameter of 2 ^+0.025 mm in a sleeve made of 40X steel with a height of 100 mm. The tests performed indicate a high reliability of the device in operation.

Claims (1)

 A device for deep hole drilling, comprising a housing with a hole for accommodating the mandrel and its drive pusher and a guide device for the pusher mounted on the housing, made in the form of several plates with a central hole for the pusher and bosses with holes located at their ends, with each plate installed with the possibility of interaction with two return springs, and guides different plates of the column are placed in different planes passing through the axis of the pusher, characterized it is equipped with bushings of elastic antifriction material pressed into each plate, the hole of which is aligned with the said central hole for the pusher installed in this hole with an interference fit, while the return springs are mounted on two pins, one of which is mounted on the top of the columns, and the other on the bosses of the plates.

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