阅读说明：本技术 一种螺栓孔倒角刀具 (Bolt hole chamfering tool ) 是由 闫旭辉 严则会 王向东 李明刚 于 2020-08-18 设计创作，主要内容包括：本发明涉及一种螺栓孔倒角刀具,其包括刀体和安装于所述刀体上的倒角刀片；所述刀体为轴类结构,其尾部匹配安装于钻机的动力输出轴,中段匹配安装有限位套轴承,头部匹配安装有旋转轴承；所述限位套轴承的外部匹配套装有限位套；位于所述限位套轴承与所述旋转轴承之间的所述刀体沿周向均匀布设有4～6个刀片安装槽；所述倒角刀片采用菱形涂层刀片结构且正中心通过紧固件匹配固定安装在所述刀片安装槽的内槽壁,所述倒角刀片的刀刃均向所述刀片安装槽的外侧突出。本发明结构设计简单、合理,解决了钢轨(辙叉)螺栓孔倒角过程出现的刀片崩韧、磨损过快、倒角表面粗糙度过大问题及倒角大小不一致问题,提高了螺栓孔倒角质量和效率。(The invention relates to a bolt hole chamfering tool, which comprises a tool body and a chamfering blade arranged on the tool body; the cutter body is of a shaft structure, the tail part of the cutter body is matched and installed on a power output shaft of the drilling machine, the middle section of the cutter body is matched and installed with a limiting sleeve bearing, and the head part of the cutter body is matched and installed with a rotary bearing; the limiting sleeve is sleeved outside the limiting sleeve bearing in a matching manner; 4-6 blade mounting grooves are uniformly distributed in the cutter body between the limiting sleeve bearing and the rotating bearing along the circumferential direction; the chamfering blade adopts rhombus coating blade structure and the positive center matches fixed mounting through the fastener and is in the inner wall of blade mounting groove, the cutting edge of chamfering blade all to the outside of blade mounting groove is outstanding. The invention has simple and reasonable structural design, solves the problems of blade breaking, quick abrasion, overlarge chamfer surface roughness and inconsistent chamfer angles in the chamfering process of the bolt holes of the steel rails (frog), and improves the chamfering quality and efficiency of the bolt holes.)

1. A bolt hole chamfering tool comprises a tool body and a chamfering blade arranged on the tool body; the method is characterized in that: the cutter body is of a shaft structure, the tail part of the cutter body is matched and installed on a power output shaft of the drilling machine, the middle section of the cutter body is matched and installed with a limiting sleeve bearing, and the head part of the cutter body is matched and installed with a rotary bearing; the limiting sleeve is sleeved outside the limiting sleeve bearing in a matching manner; 4-6 blade mounting grooves are uniformly distributed in the cutter body between the limiting sleeve bearing and the rotating bearing along the circumferential direction; the chamfering blade adopts rhombus coating blade structure and the positive center matches fixed mounting through the fastener and is in the inner wall of blade mounting groove, the cutting edge of chamfering blade all to the outside of blade mounting groove is outstanding.

2. The bolt hole chamfering tool according to claim 1, wherein: the cutting edge of the half length of the chamfering blade protrudes to the outer side of the blade mounting groove; the chamfer angle of the chamfer blade is 40-45 degrees, the margin edge length of the blade is more than or equal to 3mm, and the chamfer angle value is 0.8-3 mm.

3. The bolt hole chamfering tool according to claim 1, wherein: the cutter body is provided with a brick machine mounting hole from the center of the axial end face of the tail part along the axial direction, an annular limiting boss is formed by uniformly and outwardly extending the circumferential outer wall of the middle section along the radial direction, an assembly hole is formed from the center of the axial end face of the head part along the axial direction, and an annular step face is formed from the edge of the axial end face of the head part; the cutter body is matched and arranged on a power output shaft of an electric drill or an air drill through the mounting hole of the brick machine; the annular step surface consists of a radial circumferential surface and an axial table surface.

4. The bolt hole chamfering tool according to claim 2, wherein: one axial end of the rotary bearing is limited by an axial table top of the annular step surface, and the other axial end of the rotary bearing is limited by an annular limiting gasket; the annular limiting gasket is fixed on the axial end face of the head of the cutter body through the assembly hole and the fastening screw, so that the rotary bearing is limited and fixed on the annular step face.

5. The bolt hole chamfering tool according to claim 2, wherein: the limiting sleeve bearing is sleeved and fixed on the radial outer wall of the annular limiting boss in a matching mode.

6. The bolt hole chamfering tool according to claim 1 or 3, wherein: the diameter of the rotary bearing is 28 mm-30 mm.

7. The bolt hole chamfering tool according to claim 1 or 4, wherein: the diameter of the limiting sleeve bearing is 50 mm-85 mm.

Technical Field

The invention relates to a cutter, in particular to a bolt hole chamfering cutter.

Background

After the bolt holes of the steel rails (frog) are drilled, in order to eliminate local stress and crack sources of the bolt holes, the edge angles and burrs are eliminated according to standard requirements, and C0.8-C3 chamfering is carried out on the bolt holes with the diameter of phi 29-phi 35. In all parts of a turnout, a high manganese steel frog has the characteristics of work hardening and the like, belongs to a typical workpiece which is difficult to cut, the processing difficulty of bolt hole chamfering is high, the traditional chamfering process is mainly divided into two types, one type is to polish and chamfer by using a mushroom-shaped copying grinding wheel, and the production efficiency is low and the chamfer size is not uniform as shown in figure 1; the other method is to use a three-tooth chamfering tool for cutting and chamfering, as shown in fig. 2, the chamfering has poor surface quality and uneven size, the triangular blade is easy to break and tough, and the blade consumption is large. Along with the continuous promotion of domestic railway freight volume and speed, the user also improves thereupon to product quality requirement, and traditional bolt hole chamfer technology (quality) can not satisfy current market demand.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides the bolt hole chamfering tool which is simple and reasonable in structural design, solves the problems of blade breakage, excessive abrasion, excessive chamfer surface roughness and inconsistent chamfer angles in the process of chamfering the bolt holes of the steel rails (frog), and improves the quality and efficiency of chamfering the bolt holes.

The technical scheme of the invention is as follows:

the bolt hole chamfering tool comprises a tool body and a chamfering blade arranged on the tool body; the cutter body is of a shaft structure, the tail part of the cutter body is matched and installed on a power output shaft of the drilling machine, the middle section of the cutter body is matched and installed with a limiting sleeve bearing, and the head part of the cutter body is matched and installed with a rotary bearing; the limiting sleeve is sleeved outside the limiting sleeve bearing in a matching manner; 4-6 blade mounting grooves are uniformly distributed in the cutter body between the limiting sleeve bearing and the rotating bearing along the circumferential direction; the chamfering blade adopts rhombus coating blade structure and the positive center matches fixed mounting through the fastener and is in the inner wall of blade mounting groove, the cutting edge of chamfering blade all to the outside of blade mounting groove is outstanding.

The bolt hole chamfering tool, wherein: the cutting edge of the half length of the chamfering blade protrudes to the outer side of the blade mounting groove; the chamfer angle of the chamfer blade is 40-45 degrees, the margin edge length of the blade is more than or equal to 3mm, and the chamfer angle value is 0.8-3 mm.

The bolt hole chamfering tool, wherein: the cutter body is provided with a brick machine mounting hole from the center of the axial end face of the tail part along the axial direction, an annular limiting boss is formed by uniformly and outwardly extending the circumferential outer wall of the middle section along the radial direction, an assembly hole is formed from the center of the axial end face of the head part along the axial direction, and an annular step face is formed from the edge of the axial end face of the head part; the cutter body is matched and arranged on a power output shaft of an electric drill or an air drill through the mounting hole of the brick machine; the annular step surface consists of a radial circumferential surface and an axial table surface.

The bolt hole chamfering tool, wherein: one axial end of the rotary bearing is limited by an axial table top of the annular step surface, and the other axial end of the rotary bearing is limited by an annular limiting gasket; the annular limiting gasket is fixed on the axial end face of the head of the cutter body through the assembly hole and the fastening screw, so that the rotary bearing is limited and fixed on the annular step face.

The bolt hole chamfering tool, wherein: the limiting sleeve bearing is sleeved and fixed on the radial outer wall of the annular limiting boss in a matching mode.

The bolt hole chamfering tool, wherein: the diameter of the rotary bearing is 28 mm-30 mm.

The bolt hole chamfering tool, wherein: the diameter of the limiting sleeve bearing is 50 mm-85 mm.

Has the advantages that:

the bolt hole chamfering tool is simple in structural design and convenient to operate and use, the chamfering blades are of rhombic coating blade structures, the 4-6-tooth blades are uniformly distributed, the limiting sleeves are arranged, fine chamfering in the range of steel rail (frog) phi 29-phi 35 bolt holes C0.8-C3 is realized, the reasonable chamfering blade lap joint distribution is adopted, the structure of the chamfering blades is improved, the number of the blades is increased, the problems of toughness collapse, over-fast abrasion, overlarge chamfer surface roughness and inconsistent chamfer sizes in the process of chamfering the bolt holes of the steel rail (frog) can be effectively solved, and the quality and the efficiency of chamfering of the bolt holes are improved.

Drawings

FIG. 1 is a schematic structural view of a bolt hole chamfering tool according to the present invention.

FIG. 2 is a left side view of the bolt hole chamfering tool of the present invention.

FIG. 3 is a cross-sectional view taken in the direction A-A of FIG. 2 of the bolt hole chamfering tool of the present invention.

FIG. 4 is a schematic view of the outer chamfer of the bolt hole chamfering tool of the present invention.

FIG. 5 is a schematic view of the inner chamfer of the bolt hole chamfering tool of the present invention.

Detailed Description

As shown in fig. 1 to 5, the bolt hole chamfering tool of the present invention includes a tool body 1, a rotary bearing 2, a stop collar bearing 3, a stop collar 4, and a chamfering blade 5.

The cutter body 1 is of an axial structure, a brick machine mounting hole 11 is axially formed in the center of the axial end face of the tail part, an annular limiting boss 12 is uniformly and outwardly protruded from the circumferential outer wall of the middle section in the radial direction, an assembly hole 13 is axially formed in the center of the axial end face of the head part, and an annular step face is formed in the edge of the axial end face of the head part; the cutter body 1 is matched and arranged on a power output shaft of an electric drill 6 or an air drill through a brick machine mounting hole 11, chamfering is carried out in a manual handheld mode, and chamfering is carried out on bolt holes on the outer side of a steel rail (frog); the annular step surface consists of a radial circumferential surface and an axial table surface. Wherein, 4-6 blade mounting grooves 15 are uniformly distributed on the circumferential surface of the cutter body between the annular limiting boss 12 and the annular step surface along the circumferential direction of the cutter body 1.

The rotary bearing 2 is sleeved on the annular step surface 14 of the cutter body 1 in a matching way, one axial end of the rotary bearing is limited by an axial table surface of the annular step surface 14, and the other axial end of the rotary bearing is limited by an annular limiting gasket 21; the annular limiting gasket 21 is fixed on the axial end surface of the head of the cutter body 1 through the assembly hole 13 of the cutter body 1 and the fastening screw 22; the diameter of the rotary bearing 2 is 28mm to 30 mm.

The limiting sleeve bearing 3 is sleeved and fixed on the radial outer wall of the annular limiting boss 12 of the cutter body 1 in a matching mode, and the diameter of the limiting sleeve bearing 3 is 50-85 mm.

The limiting sleeve 4 is fixedly sleeved outside the limiting sleeve bearing 3 in a matching mode through a fastening piece 41, and the limiting sleeve 4 is arranged to realize fine chamfering in the range of a steel rail (frog) phi 29-phi 35 bolt hole C0.8-C3.

The chamfering blade 5 adopts a rhombic coating blade structure, the right center of the chamfering blade is matched with the inner groove wall of the blade mounting groove 15 of the cutter body 1 through a blade fastening screw 51, and the cutting edge of half of the length of the chamfering blade 5 protrudes to the outer side of the blade mounting groove 15 of the cutter body 1; the chamfering angle a of the chamfering blade 5 is 40-45 degrees, the blade margin edge length b is more than or equal to 3mm, the chamfering value c is 0.8-3 mm, and when the chamfering reaches the value c during manual chamfering, the limiting sleeve 4 is in contact with the frog rail web 7 to limit the feeding of the chamfering blade 5; this 5 cutting edges of chamfer blade carry out the fine processing to the chamfer surface, have improved chamfer surface quality, have solved the inconsistent problem of chamfer size, see figure 4.

The bolt hole chamfering tool provided by the invention adopts the outer side chamfering operation process of the frog bolt hole as follows:

firstly, mounting 4 rhombic blades on a chamfering tool, and connecting the chamfering tool with an electric drill 6 or an air drill;

secondly, holding an electric drill 6 or an air drill carrying a bolt hole chamfering tool, aligning the chamfering blade with the bolt hole, and starting the electric drill 6 or the air drill, wherein a certain gap is formed between the cutting edge of the chamfering blade 5 and the chamfering surface;

thirdly, uniformly feeding and chamfering the hand-held electric drill 6 or the pneumatic drill along the center of the bolt hole;

fourthly, after the stop collar 4 is contacted with the frog rail web 7, the electric drill 6 or the pneumatic drill is turned off, the quality of the chamfering surface is detected, the chamfering process is finished, and the step is shown in fig. 4. Because frog space restriction, when the inboard chamfer of frog bolt hole, need install extension bar 8 and carry out the chamfer, inboard bolt hole need increase extension bar 8 and carry out the chamfer, and L is 200mm ~ 600mm, and the operation process is the same with outside chamfer step, sees figure 5.

The invention has simple and reasonable structural design, solves the problems of blade breaking, quick abrasion, overlarge chamfer surface roughness and inconsistent chamfer angles in the chamfering process of the bolt holes of the steel rails (frog), and improves the chamfering quality and efficiency of the bolt holes.