DD243064A1 - CUTTING RING CONNECTION AND CONSTRUCTION V. CUTTING TOOLS FOR CIRCULAR BORING MACHINES - Google Patents

Abstract

The invention relates to cutting tools for rock drilling machines, which, according to the geology and the specific application, for example, as a caliber cutting ring in combination with a normal cutting ring composed to be used. It is the object of the invention to combine the same or different cutting rings with little effort, the task is based, easy to assemble and disassembly permanent construction of a cutting tool to allow, in which a trouble insertion of Hartmetallformstuecken and their recovery is achieved during wear , The task is solved by the arranged in the bore of the cutting rings between the bearing seats clamping rings, which are seated on conical or cylindrical surfaces with stop collar and contracted by clamping screws, solved, provided with dovetails front and back jumps at the connection points a centric position of the individual cutting rings to back up. Furthermore, when using a zusammenfuegbaren caliber cutting ring with inserted carbide forming pieces at the same time a clamping this achieved in appropriate Ausfraesungen. Fig. 1

Description

For this 2 pages drawings

Field of application of the invention

The cutting ring connection and the construction of cutting tools is used where they can be used in a different composition of rock drilling machines favorable for rock destruction.

Characteristic of the known technical solutions

The known cutting tools generally consist of single- or multi-bladed cutting rings or with so-called carbide knobs or plates occupied cutting rollers, a hub, a bearing system, a sealing system for lubrication and an insertable or clamped in corresponding bearing elements axis.

The cutting bodies are usually shrunk onto a bush in which the raceways for the rolling elements incorporated, while the mating tracks are arranged directly on the axles.

It is also known to use commercially available rolling bearings or jn the cutting rings or rollers the hub with raceways directly

incorporate. ·

Due to the improved systems of storage, lubrication and sealing the life of the storage is higher than that of the mountains destructive cutting rings and rollers. In order to save costs, a renewed change of the cutting body of the drilling tools would be desirable, but this brings with the shrunk onto a hub cutting body with significant disadvantages, such as a tearing of the cutting rings due to high voltages, damage to the hub, changes the einzuzuschenden tolerances for the Storage, a threat to the reliability of the cutting rings and the considerable technical and labor costs.

According to DE-AS 2742019, for example, a drilling tool would be proposed in which, due to the dimensions of cheaper cutting rings to be produced by means of a plurality of screws are axially screwed together in pairs.

However, this solution has the disadvantages that the hard and tough material can be very difficult to drill, in the post-hardening due to the previously incorporated screw holes, the course of the voltage lines is interrupted and high voltages, which can lead to cracks when stressed, build up, especially since the cross section of the cutting rings is weakened considerably by the holes. In case of wear or breakage after use of such screwed cutting rings, the screws can not be solved without difficulty, as in the high stress and in the conditions of use clogging and jamming by rock dust deposits and wear is hard to avoid.

The disadvantages associated with the required strength of the material of the cutting rings disadvantages in the processing, especially when introducing holes for carbide pins, tried to avoid by inserting carbide tips in introduced annular grooves according to DE-PS 2253414 or to avoid by this in the on Cutting surfaces applied layers are included with or poured in Gußschneidringen with.

This creates a further disadvantage that except the effort for the attachment of the pins or plates, when breaking the same untrue running of the cutting tools occurs and a reoccupation always presents difficulties or wear a replacement or a recovery of the remnants is possible only at great expense ,

Object of the invention

The described advantageous tendency of the development of the drilling tools, which is affected by said deficiency, should be continued to the effect that with reduced effort an axial and radial forces receiving connecting individual, even different cutting rings while avoiding the deficiencies described is possible.

- I - £ f ¥ O VXV *

Explanation of the essence of the invention

The invention has for its object to develop a cutting ring connection, which once a well assemble and disassembly, safe construction of a cutting tool of individual cutting rings or cutting ring parts and on the other the clamping of carbide tips, their replacement and easy recovery in case of wear

allows. ,

According to the invention the object is achieved in that individual cutting rings together by means of cylindrical conical clamping rings, which are arranged between the introduced in the bore of the cutting rings bearing seats, seated on incorporated cylindrical stop collars or conical surfaces, tightened with clamping screws and connected to each other.

In order to ensure the centric position of the cutting rings, these are performed on the frontal abutment surfaces of the connection with forward and backward corresponding fit and provided for receiving a seal to protect the storage room with a groove or groove.

After connecting the cutting rings, the insertion of the axis, commercial rolling bearings and the provided sealing and sealing elements between cutting rings and axis in a known manner.

By this type of connection of cutting rings drilling tools of various kinds can be easily combined, with the arranged inside clamping elements, such as clamping washers and clamping screws, always protected. Due to the structure according to the invention and the cutting ring connection, it is possible to provide an externally running, joinable caliber cutting ring with hard metal plates or hard metal fittings, which are fastened by means of form and adhesive, and to combine with a normal cutting ring.

For this purpose, the two cutting rings, as described above, contracted by means of clamping rings and screws, the clamping of the hard metal pieces is made possible by a two-part, constructed from base body, clamping piece and fitting and bearing ring caliber cutting ring, which matched the shape of the hard metal pieces, resulting in a positive connection Milling has, in which they are inserted and clamped when contracting the two cutting rings force and form fit with. The serving as a clamping piece caliber cutting ring part serves as a fitting for the centric position of the cutting rings, which have at the abutment surfaces, return-like mating surfaces and are secured by seals against interference by foreign substances or leakage of lubricant.

In the head area of the caliber cutting ring, the hard metal pieces sit on a fitting and bearing ring used for supporting and centering. ,

After contraction of the caliber cutting ring parts and the cutting ring by means of the clamping screws completes the drilling tools as described above.

Through this cutting ring connection all subject to wear parts are easy to manufacture and interchangeable connected for use.

embodiment

The invention will be explained in more detail below with reference to an embodiment. In the accompanying drawing shows

Fig. 1: a longitudinal section of a cutting tool of two conical clamping rings and screws connected

Cutting rings; 2 shows a section through a clamped together via conical clamping rings cutting tool from a

Caliber cutting ring with carbide fittings and a normal cutting ring; 3 shows a section A-A by a clamped cutting tool according to Figure 2; 4 shows a detail from FIG. 1 with cylindrical clamping rings

In Fig. 1 is arranged on a both sides to be fixed in bearing blocks axis 3, of two interconnected cutting rings 1; 1 'existing cutting tool shown.

The cutting rings 1; V are each rotatably mounted on the axis 3 in the plane of the cutting edge via roller bearings 2 and sealed at their outer ends with closure disks 6, mechanical seals 7, support rings 8 and correspondingly arranged annular seals 9 to the axis 3.

The lubricant supply to the bearings 2 via the incorporated in the axis 3, provided with grease nip lubrication channels.

At their junction, the cutting rings 1; 1 'joined together at their contact surfaces on projection 17 and recess 18 with snug fit 19 for centric positional fixation, wherein a circular seal 9 prevents the ingress of foreign media or leakage of lubricant.

Both cutting rings 1; 1 'are running in the inner bore between the bearing seats with each inclined to the junction cone on which run on the outer diameter with the same cone running clamping rings 4, which are contracted by uniformly distributed over the circumference clamping screws 5 and so both cutting rings 1; 1'Frame together. By inserting the parts 2; 3; 6; 7; 8th; 9; 10, the cutting tool is completed.

In the combination of a cutting ring 1 'with an externally running, joinable caliber cutting ring with carbide tipped, the construction of such a cutting tool according to FIG. 2 and FIG. 3 takes place.

The cutting ring V and the caliber cutting ring, consisting of a base body 13 and a clamping piece 16, in which in a groove incorporated in both parts a fitting and bearing ring 14 and in the introduced on the inner surfaces, form-fitting cutouts 12 hard metal fittings 15 are clamped, are As shown in FIG. 1, by means of internally arranged conical clamping rings 4, which sit on the conical inner surfaces of the base body 13 and cutting ring V, tightened over clamping screws 5 and completed.

The centric position of the individual parts of the combined cutting tool is obtained by means of mating surfaces 19 on the main body 13, impulse line 1, and at the point of view of the snare-stick, by means of rip.r Snannrinae 4 and 7

Tightening screws 5 in the base 13 and in the clamping piece 16, the inserted hard metal fittings 15 form-and

be firmly clamped.

At the connecting surfaces of the base body 13, the clamping piece 16 and. of the cutting ring 1 'are annular seals 9 arranged to prevent, that foreign material in the storage room on and lubricant can escape from it.

The combination of cutting rings according to FIG. 1 and FIG. 2 can also be made in the same way as in FIG

Clamping rings 4 ', which bear against a stop collar 20 produced by bores of different diameters are produced, wherein a conical or cylindrical design of the bracing according to the geometric conditions

to decide. ;

The advantage of such a composable cutting tool is the possibility of an appropriate use

Combination, the easy replacement of all individual elements, the favorable recovery of the materials used and an on-site possible, easy assembly or disassembly. In Gußschneidringen the production of such castings made of high-strength cast steel for the prevention of stress cracks is much cheaper, as well as the machining of a hard

Materials, in particular the drilling of difficult to introduce holes was avoided.

Claims (3)

claims: 1. cutting ring connection and construction of cutting tools for rock drilling machines, consisting of a Schneidring- or cutting roller body, an axle, two rolling bearings and a sealing and lubricating system, characterized in that the cutting tools of individual, identical or different cutting rings (1; T) and cutting ring parts {13; 14; 15; 16) are assembled according to the conditions of use, to which the cutting ring vF; 1) or the base body (13) as part of a mating caliber cutting ring (13; 14; 15; 16) in its bore to the abutment surfaces in front of the incorporated bearing seats of the rolling bearing (2) tapered conical or cylindrical inner surfaces with a stop collar (11 ), on each of which on the outer circumference also conical clamping ring (4) or cylindrical clamping ring (4 ') is arranged, which are clamped together by uniformly distributed clamping screws (5). 2. Cutting ring connection according to claim 1, characterized in that the mating caliber cutting ring, consisting of a base body (13), a on this on mating surfaces (19) movable clamping piece (16), the form-fitting in the inner surfaces of the edge of the cutting edge tapered, evenly on both sides distributed over the circumference, the cutting edge tapering recesses (12) in which hard metal fittings (15) are inserted, and a fitting and bearing ring (14) on which the hard metal fittings (15) sit and in a in the inner surface of the Base (13) and the clamping piece (16) incorporated groove is inserted, wherein a tensioning piece (16) formed collar is inserted into the introduced at the abutting surface recess (18) of the base body (13) and cutting ring (V) and on the mating surfaces (19) is seated. 3. Cutting ring connection according to claim 2, characterized in that on the abutting side of the cutting ring (1) a projection (17) with mating surface (19) is worked, in the recess (18) of the cutting ring (T) on the mating surface (19). seated.