RU185267U1 - Cutting Collet Mandrel - Google Patents

Abstract

The utility model relates to machine tool construction and can be used as a universal device for fastening bench and cutting tools or workpieces on machine tools in various industries. A mandrel with a split collet contains a nut-drive, petals of a split collet and a split sleeve for fastening the part, where the split collet is a tubular shaft with external thread according to free quality, a nut-nut screwed onto it, an annular groove along the inner diameter and grooves to the annular groove. The split sleeve for fastening the part is inserted into the split collet until it is fixed along the annular groove of the rod within the elastic deformation of the petals of the split collet. The outer surface of the split sleeve for fastening the part is made conical with diameters of 3-5 °, where the small diameter of the cone corresponds to the size of the received fit along the inner diameter of the rod, and the inner surface is cylindrical or corresponding to another profile of the fixed part. In addition, with a tapered shank with diameters of 3-5 °, its fastening is carried out directly without a split sleeve. Effect: simplicity of the device and versatility of use.

The universal mandrel with a split collet is conveniently combined with various tools for mobile use, providing reliability of fastening and safety when performing work.

Description

The utility model relates to machine tool construction and can be used as a universal device for fastening bench and cutting tools or workpieces on machine tools in various industries.

Of the many devices with a collet mounting tool or workpiece known mandrel with a split collet [1. Pat. RU 2 412 787 C1, IPC B23B 31/40. Mandrel with a split collet / Blinov V.D., Blinov D.S., Zhigunova N.F., Kolobov A.Yu., Komarova M.E. - Publ. 02/27/2011. Bull. No. 6]; [2. Pat. on PM RU 177 809 U1, IPC В23В 31/40, B23Q 3/14. Mandrel with a split collet for securing the workpiece on the machine / Babich N.N., Blinov D.S., Zhigunova V.A., Kolobov A.Yu., Krasnova O.N. - Publ. 03/13/2018. Bull. No. 8], containing a shaft with coaxial conical and cylindrical sections and split collets for securing the workpiece on the machine.

These devices are intended for processing on a machine tool a specific part and cannot be used as universal mandrels, which is their drawback.

Known butt collet clamp [3. Pat. to PM RU 92 388U1, IPC B60 1/24. Butt collet clamp for multiwire and contact wires / Porcelan A.A., Porcelan A.A. - Publ. 03/20/2010. Bull. No. 8], comprising a clamping body, two nuts and two collets, where each collet is divided by grooves into segments interacting on conical surfaces with nuts, thereby ensuring collet compression.

The disadvantage of this device, as well as devices for patents [1; 2], is that it does not have universality of use, and also that most often it is intended for single use.

The prototype of the claimed utility model is taken collet mechanism, centering the part on the outer surface [4. Bolotin H.L. Machine tools / H.L. Bolotin, F.P. Kostromin. - M.: Mechanical Engineering, 1973. - S. 720-73, Fig. 37], containing a nut-drive, moving the sleeve with a conical surface, through which the sleeve compresses the petals of the cut cone of the collet. This compression is transmitted to the split sleeve and the workpiece placed in it. The device also contains structural elements that prevent the rotation of the conical sleeve and its return to its original position. To ensure that the sleeve fits along the 30 ° collet cone in the working position, the angle of the collet cone in the free state is underestimated or overestimated by 1, depending on the type of construction.

The prototype device has the following disadvantages:

- complex design, designed for stationary conditions as machine tool equipment and for mobile devices is not acceptable;

- to ensure minimal centering deviation of the workpiece with multi-link design requires high precision manufacturing of mating elements of the device.

The objective of the utility model is to create a simple mandrel with a split collet, which has the universal properties of a fixture for attaching a bench and cutting tool or workpieces during machining of parts on machines, while ensuring the reliability of the collet attachment.

The inventive mandrel contains a split collet having petals separated by grooves, a nut-drive and a split sleeve for mounting parts. The cutting collet is made in the form of a tubular rod with an external thread on which a nut-drive is screwed, with an annular groove in the inner diameter and grooves to the annular groove. The split sleeve for fastening the part is made conical with diameters corresponding to an opening angle of 3-5 ° of the collet petals, the small diameter of the cone corresponding to the size of the received fit along the inner diameter of the rod and the inner cylindrical surface and inserted into the split collet until it is fixed along the annular groove of the rod within the elastic deformation of the petals of a split collet.

The inventive utility model coincides with the device selected as a prototype, according to the following set of essential features:

- nut drive;

- petals of a split collet;

- split sleeve mounting parts.

The essence of the utility model is illustrated by drawings, where in FIG. 1, 2 presents a mandrel with a split collet, made in the form of a tubular rod 1 with an external thread, onto which a nut-drive is screwed 2. The rod 1 contains an annular groove 3 in inner diameter and grooves 4 to the annular groove, forming elastic petals of the split collet 5, where with the base along the groove 3, a split sleeve 6 for attaching the part 7 is inserted. The split sleeve 6 is made conical with diameters corresponding to an opening angle of 3-5 ° of the collet petals. The number of sleeves 6 is determined by the kit and is a series of the size of tools or parts for certain jobs.

In FIG. 3 shows the current version of the mandrel with a split collet.

The procedure for working with a mandrel with a split collet is as follows. Starting position: nut-drive 2 is screwed onto the rod 1 beyond the zone of elastic deformation of the collet 5 petals, the sleeve 6 is inserted into the collet 5 until it is fixed along the groove 3, which corresponds to an opening angle of 3-5 ° of the collet 5 petals within their elastic deformation and possible movement drive nuts 2 30-40% of the length of the position of the sleeve 6 in the rod 1. Work with the tool is determined by the following operations: the corresponding tool 7 is inserted into the sleeve 6, the nut drive moves along the thread, compressing the petals of the collet 5, this compression is transmitted to the sleeve 6 and placed th in her instrument 7 what determines the mandrel ready for use. The mismatch of the surfaces of the inner diameter of the rod 1 and the conical surface of the sleeve 6 within the specified limits positively affects the prevention of rotation of the compressed sleeve 6 and the tool 7.

A mandrel with a split collet is conveniently combined with various tools for mobile use, while providing the main requirement - the reliability of fastening and safety precautions when performing work.

The technical result of the proposed utility model is the simplicity of the device and the versatility of use.

The proposed utility model can be performed using standard equipment and materials of domestic production. Thus, the claimed device meets the criterion of "industrial applicability".

Sources taken into account

1. Pat. RU 2 412 787 C1, IPC B23B 31/40. Mandrel with a split collet / Blinov V.D., Blinov D.S., Zhigunova N.F., Kolobov A.Yu., Komarova M.E. - Publ. 02/27/2011. Bull. No. 6.

2. Pat. on PM RU 177809 U1, IPC В23В 31/40, B23Q 3/14. Mandrel with a split collet for securing the workpiece on the machine / Babich N.N., Blinov D.S., Zhigunova V.A., Kolobov A.Yu., Krasnova O.N. - Publ. 03/13/2018. Bull. Number 8.

3. Pat. to PM RU 92388 U1, IPC B60 1/24. Butt collet clamp for multiwire and contact wires / Porcelan A.A., Porcelan A.A. - Publ. 03/20/2010. Bull. Number 8.

4. Bolotin H.L. Machine tools / H.L. Bolotin, F.P. Kostromin. - M.: Mechanical Engineering, 1973.- 344 p.

5. Pat. RU 2106937 C1 IPC V23C 5/26; B23B 29/04. End Mill Adapter with a Locking Nut and Collet Lowering Torque / David L. Lewis, Victor D. Mojilinki, Thomas J. Presby. - Publ. 03/20/1998.

6. GOST 31.1066.02-85. Adaptations to metal cutting machines. Mandrels with split collets for precise work. Enter 01/01/86. Reprint with rev. Aug 1990. - M .: Publishing house of standards. 1990. - 17 p.

7. Pat. CN 205967483, IPC B23B 31/40. Thin-wall sleeve clamping structure / LuManhua, Wang I. - Publ. 02.22.2017.

Claims (1)

A mandrel containing a split collet having petals separated by grooves, a drive nut and a split sleeve for fastening a part, characterized in that the split collet is made in the form of a tubular shaft with an external thread onto which the drive nut is screwed, with an annular groove in the inner diameter and grooves to the annular groove, the split sleeve for fastening the part is made conical with diameters corresponding to the opening angle of 3-5 ° of the collet petals, and the small diameter of the cone corresponds to the size of the received fit along the inner Diameter of the rod and the internal cylindrical surface and inserted into a split collet to lock on the annular groove of the rod within the elastic deformation of the split collet petals.

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