CN111482643A

CN111482643A - Steel rail milling cutter

Info

Publication number: CN111482643A
Application number: CN202010351797.5A
Authority: CN
Inventors: 邝文建; 孔德隆; 李佩刚
Original assignee: Qingyan Ruiwei Luoyang Rail Transit Technology Co ltd
Current assignee: Qingyan Ruiwei Luoyang Rail Transit Technology Co ltd
Priority date: 2020-04-28
Filing date: 2020-04-28
Publication date: 2020-08-04

Abstract

A rail milling cutter comprises blades and a cutter disc, wherein a plurality of blades are arranged according to the mode that a cutting part envelopes the outline of the section of a rail to form a cutter set, the plurality of cutter sets are arranged on the cutter disc along the circumferential direction, the blades of the same cutter set comprise straight-edge blades and arc blades, the arc blades are processed on the basis of the straight-edge blades, an arc notch is cut on the surface of the straight-edge blades with short edges, the central line of the arc notch is parallel to the short edges, and the arc notch is cut into an arc edge on each of two long edges to form the arc blades; the cutter head is provided with a positioning surface, and the blade is fixed on the cutter head through a wedge block after being placed on the positioning surface. Has the advantages that: the blade with only one arc on one surface reduces the processing difficulty, and a plurality of cutting edges are processed on the blade and replaced when damaged, thereby reducing the cost; the blade mounting structure is changed, so that the cutting resistance is reduced, and the blade mounting structure is suitable for mounting a new-material blade; and the cutting surface quality is improved by adopting the new-material blade.

Description

Steel rail milling cutter

Technical Field

The invention relates to a milling cutter structure, in particular to a steel rail milling cutter.

Background

In recent years, rail transit has been rapidly developed, and the use of rails has been increasingly deteriorated with increasing speeds, heavy loads, and departure frequency. The surface of the steel rail is easy to generate fatigue crack, peeling, fat edge and other cross section defects and wave abrasion and other longitudinal section defects. The change of the steel rail profile and the smoothness have important influence on the driving safety, the comfort and the economy. In order to improve the wheel-rail relationship, prolong the service life of the steel rail and improve the economy and safety, the method for repairing the steel rail is a commonly adopted mode at home and abroad.

The rail milling is a new technology developed in recent years, a rail milling and grinding vehicle processes a rail in a circumferential milling mode, and a plurality of groups of milling cutter discs remove the surface material of the rail in a forming milling mode, eliminate the defects of the rail and improve the smoothness. The steel rail milling and grinding train has the characteristics of large one-time milling depth (0.3-3 mm), high efficiency, no spark dust, good cleaning performance and the like, and has wide prospect.

The milling cutter disc is a core component of the steel rail milling and grinding vehicle, a plurality of blades envelop the profile of a steel rail to form a cutter group, and the cutter groups are uniformly distributed on the circumference of the milling cutter disc. The cutter blade is usually installed on the cutter disc body in a vertical mode, the cutter blade is installed on the cutter disc body through a screw, the screw is in the vertical direction, the mode is suitable for heavy-load cutting, but the requirement on the installation mechanism and the rigidity of the cutter body is high due to large cutting force. Generally, there are two types of blades, one is a straight edge blade and the other is an arc edge blade, in which arcs of the arc edge blade are two arcs intersecting each other on one surface, and grinding is required, which makes machining difficult. Conventional inserts are typically coated cemented carbide inserts.

Disclosure of Invention

In view of the above technical problems, an object of the present invention is to provide a rail milling cutter.

The purpose of the invention is realized by adopting the following technical scheme. The steel rail milling cutter provided by the invention comprises blades and a cutter disc, wherein a plurality of blades are arranged according to a mode that a cutting part envelopes the outline of the section of a steel rail to form a cutter group, the plurality of cutter groups are arranged on the cutter disc along the circumferential direction, the blades of the same cutter group comprise straight-edge blades and arc blades, the arc blades are processed on the basis of the straight-edge blades, an arc notch is cut on the surface of the straight-edge blades with short edges, the central line of the arc notch is parallel to the short edges, and the arc notch is respectively cut into an arc edge on each of two long edges to form the arc blades; the cutter head is provided with a positioning surface, and the blade is fixed on the cutter head through a wedge block after being placed on the positioning surface.

Further, the circular arc blade is any one of circular arc blades having cutting edges of 2, 4, 6, and 8.

Furthermore, the blade is made of any one of hard alloy, ceramics, cubic boron nitride, a diamond composite sheet and a CBN composite sheet.

Furthermore, a groove is formed in the cutter head, the wedge block is placed in the groove to press the side face of the blade, the other side face and the bottom face of the blade are pressed on the positioning face, and then the wedge block is fixed on the cutter head.

Compared with the prior art, the steel rail milling cutter has the beneficial effects that:

1. The blade with only one arc on one surface is installed in a vertical mode, the short edge of the blade is close to the tangential direction of the cutter head, the blade is easy to process and control precision, the processing difficulty of the blade is reduced, the cost is low, and the radius of the arc can be changed easily according to the requirement; all the surfaces with the short sides can be provided with arc notches to form cutting edges, and when one group of the cutting edges are damaged, the cutting edges on the other surfaces can be replaced and used, so that the cost is saved.

2. The blade mounting structure is changed, the cutting resistance is reduced, and the blade mounting structure is suitable for mounting of new-material blades.

3. The novel material blade is adopted, so that the sharpness of the blade is improved, the cutting resistance is reduced, the quality of the cutting surface is improved, the cutting speed is improved, and the residual ripples are reduced.

The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented in accordance with the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more clearly understood, the following preferred embodiments are described in detail with reference to the accompanying drawings.

Drawings

FIG. 1 is a cutter head of an embodiment of a rail milling cutter of the present invention;

FIG. 2 is a schematic view of an insert mounting structure of an embodiment of a rail milling cutter according to the present invention;

Fig. 3 is a schematic structural view of a circular arc blade of an embodiment of the steel rail milling cutter according to the present invention.

[ reference numerals ]

1-cutter head body 2-wedge 3-screw 4-contact surface 5-arc blade 51-short edge 52-arc

53-cutting edge 6-positioning surface 7-cutter head 8-cutter group 9-straight edge blade

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Fig. 1 to 3 show an embodiment of a rail milling cutter according to the present invention, which includes a wedge 2, a cutter blade, and a cutter head 7. The blades comprise straight-edge blades 9 and arc blades 5; the arc blade 5 is further processed by the straight edge blade 9, a surface with a short edge 51 is selected on the straight edge blade, an arc 52 is processed on the surface along the direction of the short edge 51 of the straight edge blade 9, the arc notch forms two cutting edges 53 on the other two long edges, arcs can be processed on other surfaces with short edges of the straight edge blade according to requirements, any number of cutting edges in 2, 4, 6 and 8 can be formed on one blade, when one group of blades is damaged, the other group of cutting edges of the blades can be directly switched, and the cost is saved. The blade is made of any one of hard alloy, ceramics, cubic boron nitride, a diamond composite sheet and a CBN composite sheet.

A positioning surface 6 and a threaded hole for mounting a wedge 2 are arranged on a cutter head body 1 for mounting the blade, the installation process of the blade is described by taking an arc blade 5 as an example, firstly, the side surface of the arc blade 5 is tightly attached to the positioning surface 6 and the bottom surface to ensure that the arc blade 5 is placed at a correct position, then, a wedge 2 is placed in a groove of the cutter head body 1, meanwhile, a contact surface 4 of the wedge 2 is pressed on the other side surface of the arc blade 5, then, a screw 3 penetrates through a hole in the wedge 2 and is screwed into the threaded hole in the cutter head body 1 to fix the wedge 2, and the stress direction during cutting is shown by an arrow in figure 2. In another embodiment of the invention, a hole is drilled in the center of the circular arc blade 5, and the circular arc blade is directly fixed on the cutter head body 1 by using a screw. The arc blade adopts the mode of vertical installation, and the minor face is unanimous with the tangential direction of blade disc. The straight blade 9 is mounted in the same manner as the circular blade 5.

3 straight sword blades 9, 2 circular arc blades 5 arrange into a knife tackle 8 according to the mode of its cutting part envelope treat processing rail cross-section outline, can be according to actual need, change the quantity of straight sword blade 9, circular arc blade 5, and a plurality of knife tackle 8 is arranged along the circumference of blade disc 7. When the cutter head 7 is arranged on mobile equipment such as a rail milling and grinding vehicle and the like for repairing the steel rail, the surface material of the steel rail is milled, the defect of the steel rail is eliminated, and the steel rail is smoother. The cutter head 7 can also be arranged on fixed processing equipment such as a steel rail processing machine tool and the like, and is used for processing an abrasion steel rail, a gradual change steel rail and a turnout, and can also be used for off-line processing of a damaged steel rail.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a rail milling cutter, includes blade, blade disc, and a plurality of blades are arranged according to the mode of cutting part envelope rail cross section outline and are constituted a knife tackle, and is a plurality of the knife tackle is installed on the blade disc along circumference, its characterized in that: the blades of the same cutter group comprise straight-edge blades and arc blades, the arc blades are processed on the basis of the straight-edge blades, an arc notch is cut on the surface of the straight-edge blades with the short edges, the central line of the arc notch is parallel to the short edges, and the arc notches cut an arc edge on each of the two long edges to form the arc blades; the cutter head is provided with a positioning surface, and the blade is fixed on the cutter head through a wedge block after being placed on the positioning surface.

2. A rail milling cutter according to claim 1, wherein: the circular arc blade is any one of circular arc blades with cutting edges of 2, 4, 6 and 8.

3. A rail milling cutter according to claim 1, wherein: the blade is made of any one of hard alloy, ceramics, cubic boron nitride, a diamond composite sheet and a CBN composite sheet.

4. A rail milling cutter according to claim 1, wherein: the cutter head is provided with a groove, the wedge block is placed in the groove and presses the side surface of the blade, the other side surface and the bottom surface of the blade are pressed on the positioning surface, and then the wedge block is fixed on the cutter head.