PL157062B1 - Apparatus for chamfering pipe ends - Google Patents

Abstract

The invention relates to a device for internal and external pipe bevelling and pipe facing.Known types of bevelling devices comprise the one with a housing, in which a driving motor is placed to power a tool head equipped with cone-shaped mills and cutters for internal and external bevelling. Also known is a pipe cutting machine consisting of a housing and a disc cutter, which is clamped around a pipe to be cut. This machine is also equipped with an attachable cone-shaped mills for internal bevelling. The above-mentioned known bevelling and cutting devices apply grips and chucks to hold pipes.This invention relates to a bevelling machine with a housing, in which a driving motor is placed to power a spindle rotationally mounted on a sleeve. Fixed on the spindle is a tool head equipped with three cutters: one for internal bevelling, one for external bevelling and one for pipe facing. Also mounted on the spindle is a fastening unit that contains gripping jaws formed by two arms of a lever, being rotationally mounted on a pin secured to the housing. The lever arms have half-roller cavities in their upper sections where halves of short longitudinally divided fastening sleeves are seated, their inner diameters so adjusted as to match an outer diameter of a machined pipe. In the lower sections of the same lever arms there are half-cone cavities inside which slidably settled is a clamping cone fixed to a piston rod of a pneumatic servo motor. The servo motor is controlled by a pneumatic valve mounted on the machine housing. Lower parts of the gripping jaws are equipped with tension springs.Owing to the fact that the tool head is fitted with three cutters, simultaneous operations of internal bevelling, external bevelling and pipe facing are possible. This shortens the time required for pipe machining and ensures that successive pipes are machined in a repetitive way. The fastening sleeves of upper jaws being short, machined pipes can be held firmly. Besides, the application of a pneumatic fastening system with an exchangeable, longitudinally divided fastening sleeve provides high pipe exchange rate and enables machining of different pipe diameters.

Description

RZECZPOSPOLITA PATENT DESCRIPTION 157 062 POLAND

Additional patent to patent no. - Filed: 88 09 13 (P. 288 040)

Precedence - Int. C1. ⁵ B23B 5/18 B23D 19/06

OFFICE

PATENT

RP

Application announced: 89 06 26

Patent description published: 1992 11 30

OOTUM iO ί L O

Inventor: Tadeusz Legut

The holder of the patent: "BUMAR-FADROMA" Fabryka Maszyn Budowlanych, Wrocław (Poland)

Pipe chamfering device

The subject of the invention is a device for chamfering pipes for making external and internal chamfers and for facing the end face of pipes.

A device for chamfering pipes is known, consisting of a body in which a drive unit is mounted, driving a tool head equipped with a conical cutter for making internal chamfers or a knife for making internal and external chamfers. There is also a known device for cutting pipes, consisting of a body and circular knives pressed around the pipe to be cut, equipped with an attachment with a conical cutter for internal chamfering of pipes. The clamping of the pipes to be chamfered takes place in the known devices for chamfering and cutting pipes in mechanical lathe chucks or vices.

The essence of the invention is a device for chamfering pipes, consisting of a body in which a drive unit is placed, driving a spindle rotatably mounted in the body sleeve with a tool head mounted on it, equipped with three cutting knives: for external chamfering, internal chamfering and facing the front surface of the pipe, and a fastening set consisting of clamping jaws formed by two arms of a two-arm lever, rotatably mounted in the center on a pin permanently fixed to the body, having in the upper part half-cylindrical recesses in which the halves of a longitudinally divided short mounting sleeve with an internal diameter adapted to to the outer diameter of the processed pipe, while in the lower part they have two semi-conical recesses, inside which there is a sliding clamping cone, permanently connected with the piston rod of the pneumatic actuator controlled by a pneumatic valve placed on the body of the device. The lower arms of the clamping jaws are equipped with a retracting spring.

By equipping the tool head of the device with three knives, it is possible to chamfer the external and internal simultaneously and plan the front surface of the pipe, which shortens the processing time and guarantees the repeatability of the size of the phases performed on successively processed pipes. The short length of the split clamping sleeve, seated in the semi-cylindrical recesses of the upper part of the clamping jaws, allows for secure clamping and processing of bent pipes in them. The use of a pneumatic clamping unit with an interchangeable, longitudinally divided clamping sleeve allows for quick clamping in this set of pipes of different diameters.

157 062

A device for chamfering pipes is shown in the embodiment in the drawing, in which Fig. 1 shows a sketch of the device in a side view with a partial section, and Fig. 2 is a sketch of a view of the device from the clamping mechanism side with a partial section shown in Figs. 1A-A.

As shown in the drawing, the device for chamfering pipes consists of a body 1 in which a driving unit 2 is placed, driving a spindle 4 rotatably mounted in the sleeve 3 of the cap 1, with a tool head 5 fitted on it, equipped with three cutting knives 6 for external chamfering, internal and for facing the pipe face, and a fastening set consisting of clamping jaws 7 formed by two arms 8 of a two-arm lever mounted in the center pivotally on a pin 9 permanently fixed to the body 1, having in the upper part half-shaft recesses 10 in which there are placed the halves of the longitudinally divided short mounting sleeve 11 with an internal diameter adapted to the external diameter of the pipe being processed, while in the lower part having two semi-conical recesses 12, inside which a clamping cone 13 is slidably connected, permanently connected with the piston rod of the pneumatic actuator 14 controlled by a pneumatic valve 15 placed on the corp Uses 1 device. The lower arms of the clamping jaws 7 are equipped with a pull spring 16.

The operation of the clamping unit is that by inserting the clamping cone 13 into the conical seat, formed by two semi-conical recesses 12, the lower arms 8 of the two-arm levers are opened and their upper arms are shorted, which results in the clamping of the longitudinally divided clamping halves. sleeve 11 on processed pipe 17.

Claims (2)

as a result, the halves of the longitudinally divided clamping sleeve 11 clamping on the pipe 17 to be processed. Patent claims A device for chamfering pipes, consisting of a body in which a drive unit is placed, driving a spindle with a tool head mounted on it, and a pipe clamping unit, characterized in that the tool head (5) is equipped with three cutting knives (6). ) for external and internal chamfering and for facing the pipe face, and the fixing assembly consists of clamping jaws (7) formed by two arms (8) of a two-arm lever mounted in the center rotating on a pin (9) permanently attached to the body (1), having in the upper part, half-cylindrical recesses (10), in which the halves of the longitudinally divided mounting sleeve (11) are placed, with an internal diameter adapted to the outer diameter of the pipe being processed, while in the lower part there are two semi-conical recesses (12), inside which a sliding clamping cone is placed (13), permanently connected to the piston rod of the pneumatic actuator (14) controlled by a pneumatic valve (15) located on the body (1) of the device. 2. Pipe chamfering device according to claim 1. The clamp according to claim 1, characterized in that the lower arms of the clamping jaws (7) are provided with a pull-back spring (16).