阅读说明：本技术 一种用于加工航空零件大直径装配孔的掏孔刀具 (Hole digging cutter for machining large-diameter assembly holes of aviation parts ) 是由 陶俊杰 陈鹏飞 李晓伟 张世贵 张强 周小文 于 2020-06-11 设计创作，主要内容包括：本发明公开了一种用于加工航空零件大直径装配孔的掏孔刀具,属于加工刀具技术领域。一种用于加工航空零件大直径装配孔的掏孔刀具,包括：刀体和装配在刀体内的弹性顶出组件；刀体包括切削端和夹持端,刀体的内部设有安装腔；切削端设有截面呈弧形的第一安装体和第二安装体,所有安装体围绕刀体的轴线设置,并且所有安装体的内侧形成与安装腔连通的集料腔,所有安装体的端部边缘分别设有刀片；安装体的内侧壁设有呈弧形的斜坡面,斜坡面从安装体的端部向靠近安装腔的中心轴线所在的方向倾斜。本发明的掏孔刀具在完成掏孔操作后,在挤出废料时,废料会出现单侧受力不均匀的状态,便于将废料弹出集料腔,避免出现卡料现象。(The invention discloses a hole digging cutter for machining a large-diameter assembly hole of an aviation part, and belongs to the technical field of machining cutters. A draw hole cutter for processing aviation part major diameter pilot hole includes: the cutter body and the elastic ejection assembly assembled in the cutter body; the cutter body comprises a cutting end and a clamping end, and an installation cavity is arranged in the cutter body; the cutting end is provided with a first mounting body and a second mounting body with arc-shaped sections, all the mounting bodies are arranged around the axis of the cutter body, the inner sides of all the mounting bodies form a material collecting cavity communicated with the mounting cavity, and the end edges of all the mounting bodies are respectively provided with a blade; the inner side wall of the mounting body is provided with an arc-shaped slope surface, and the slope surface inclines from the end part of the mounting body to the direction close to the central axis of the mounting cavity. After the hole digging cutter finishes the hole digging operation, when the waste is extruded, the waste can be stressed unevenly on one side, the waste can be conveniently ejected out of the material collecting cavity, and the phenomenon of material blocking is avoided.)

1. The utility model provides a draw hole cutter for processing aviation part major diameter pilot hole which characterized in that includes: the cutter body (10) and an elastic ejection assembly (20) assembled in the cutter body (10); the cutter body (10) comprises a cutting end (11) and a clamping end (12), and an installation cavity (13) is formed in the cutter body (10); the cutting end (11) is provided with a first mounting body (141) and a second mounting body (142) with arc-shaped sections, the first mounting body (141) and the second mounting body (142) are arranged around the axis of the cutter body (10), a material collecting cavity (15) communicated with the mounting cavity (13) is formed in the inner sides of the first mounting body (141) and the second mounting body (142), and the end edges of the first mounting body (141) and the second mounting body (142) are respectively provided with a blade (30); the inner side wall of the mounting body is provided with an arc-shaped slope surface (16), and the slope surface (16) inclines from the end part of the mounting body (14) to the direction close to the central axis of the mounting cavity (13).

2. The hole drilling tool for machining large-diameter assembly holes of aviation parts as claimed in claim 1, wherein the elastic ejection assembly (20) extends from the material collection cavity (15) into the mounting cavity (13), and the elastic ejection assembly (20) comprises a limiting seat (21), an ejector rod (22) and an elastic piece (23); the limiting seat (21) is positioned in the mounting cavity (13), and the side wall of the limiting seat (21) is connected with the side wall of the cutter body (10) through a radial connecting piece (26); the ejector rod (22) penetrates through the limiting seat (21) from the material collecting cavity (15) and then extends into the mounting cavity (13), and is connected with the cutter body (10) through the elastic piece (23), and the ejector rod (22) is in sliding fit with the limiting seat (21).

3. The hole digging cutter for machining large-diameter assembly holes of aviation parts as claimed in claim 2, wherein said ejector rod (22) is provided with a limit protrusion (24), one side of said limit protrusion (24) is in contact with said limit seat (21), and the other side of said limit protrusion (24) is in contact with said elastic member (23).

4. The underholing cutter for machining large-diameter assembly holes of aircraft parts according to claim 3, characterized in that the cross section of the ejector rod (22) is polygonal.

5. The hole drilling tool for machining large-diameter assembly holes of aviation parts as claimed in claim 4, wherein said elastic ejection assembly (20) further comprises a mounting seat (25) arranged in said mounting cavity (13), and two ends of said elastic member (23) are respectively in contact with said limiting protrusion (24) and said mounting seat (25).

6. The hole drilling tool for machining large-diameter assembly holes of aviation parts as claimed in claim 5, wherein the side wall of the limiting seat (21) is further connected with the side wall of the tool body (10) through threads.

7. The tool for the production of large-diameter assembly holes for aeronautical parts according to claim 6, characterized in that the radial connectors (26) are threaded pins or screws.

8. The hole drilling tool for machining large-diameter assembly holes of aviation parts as claimed in any one of claims 1 to 7, wherein said slope surface (16) is formed on an inner side wall of said first mounting body (141) or said second mounting body (142), and two sides of said slope surface (16) extend to the inner side wall of the corresponding mounting body.

9. The hole-tapping tool for machining large-diameter assembly holes for aeronautical parts according to claim 8, characterized in that the maximum inclination of the ramp surface (16) does not exceed 5 °.

10. The hole tapping tool for machining large-diameter assembly holes of aerospace components of claim 8, wherein the first mounting body (141) and the second mounting body (142) are evenly spaced around the axis of the tool body (10).

Technical Field

The invention relates to the technical field of machining tools, in particular to a hole digging tool for machining a large-diameter assembly hole of an aviation part.

Background

Aeronautical parts, in particular aeronautical case-like parts, on the surface of which are distributed a plurality of functional characteristic holes for assembly, such as: fuel oil holes, flange edge mounting holes and the like. Because most of the assembly holes have larger apertures and the hardness of the part materials is higher, the traditional drilling-milling mode has lower efficiency and larger tool consumption, so the modern processing technology adopts a special hole digging tool for high-efficiency processing. However, when the existing hole digging cutter is used for hole digging and machining, a large amount of burrs are generated on a part cutting layer, so that the situation that a part cutting material card cannot fall off at the center of the cutter often occurs, and when the cutter carries waste materials to continuously work, great potential safety hazards are generated on subsequent machining.

Disclosure of Invention

The invention aims to provide a hole digging cutter for machining a large-diameter assembly hole of an aviation part, and the hole digging cutter is used for solving the problem that material clamping is easy to occur when the existing hole digging cutter is used for machining the large-diameter assembly hole of the aviation part.

The technical scheme for solving the technical problems is as follows:

a draw hole cutter for processing aviation part major diameter pilot hole includes: the cutter body and the elastic ejection assembly assembled in the cutter body; the cutter body comprises a cutting end and a clamping end, and an installation cavity is arranged in the cutter body; the cutting end is provided with a first mounting body and a second mounting body with arc-shaped sections, the first mounting body and the second mounting body are arranged around the axis of the cutter body, a material collecting cavity communicated with the mounting cavity is formed inside the first mounting body and the second mounting body, and blades are respectively arranged on the end edges of the first mounting body and the second mounting body; the inner side wall of the mounting body is provided with an arc-shaped slope surface, and the slope surface inclines from the end part of the mounting body to the direction close to the central axis of the mounting cavity.

The blade is used for cutting a workpiece, during cutting, the blade rotates along the edge of a hole to be machined, the edge of the hole to be machined is cut, scraps of chips gradually enter the material collecting cavity along with the chip cutting process, and after the chips are cut, the elastic ejection assembly releases elastic potential energy to extrude the columnar scraps out of the material collecting cavity, so that the cutter can perform hole digging operation again. Because the burr can appear in the lateral wall of waste material at the cutting in-process, the lateral wall that leads to the waste material can not separate with the inside wall in the chamber that gathers materials, card material phenomenon appears promptly, and the waste material can not popped out, and the cutter can produce very big potential safety hazard when continuous operation. Therefore, the slope surface is arranged on the inner side wall of the installation body, the slope surface has a guiding effect, the waste material is in contact with one side of the installation body through the slope surface, when the elastic ejection assembly extrudes the waste material, the waste material is in a state of uneven stress on one side, the waste material is conveniently ejected out of the material collection cavity, and the phenomenon of material blocking is avoided.

Furthermore, the elastic ejection assembly extends into the mounting cavity from the aggregate cavity, and comprises a limiting seat, an ejector rod and an elastic piece; the limiting seat is positioned in the mounting cavity, and the side wall of the limiting seat is connected with the side wall of the cutter body through a radial connecting piece; the ejector pin runs through spacing seat from the chamber of gathering materials and then stretches into the installation intracavity to be connected with the cutter body through the elastic component, ejector pin and spacing seat sliding fit.

The elastic ejection assembly is used for ejecting waste materials, the waste materials gradually enter the material collection cavity during cutting, the waste materials extrude the ejector rod to enable the ejector rod and the limiting seat to slide, meanwhile, the elastic piece is compressed, and after the cutting is finished, the waste materials are separated from a workpiece, the elastic piece releases elastic potential energy to drive the ejector rod to push the waste materials, and the waste materials are ejected out of the material collection cavity. During cutting machining, because relative rotation can take place between cutter and the work piece for frictional force can appear between ejector pin and the waste material, owing to can appear the feeding operation simultaneously, can appear the extrusion force between ejector pin and the waste material, frictional force and extrusion force combined action can produce the moment of unscrewing. Therefore, the radial connecting piece is used for connecting the limiting seat and the cutter body and overcoming the unscrewing moment, the elastic ejection assembly and the cutter body cannot loosen under the action of the unscrewing moment, and the elastic ejection assembly is prevented from losing efficacy due to loosening, so that the material clamping condition is avoided.

Furthermore, the ejector rod is provided with a limiting bulge, one side of the limiting bulge is in contact with the limiting seat, and the other side of the limiting bulge is in contact with the elastic piece.

The limiting bulge of the invention avoids the over-displacement of the ejector rod and avoids the separation between the ejector rod and the limiting seat.

Further, the cross section of the ejector rod is polygonal.

When the cross section of the ejector rod is polygonal, the ejector rod and the limiting seat can only slide but cannot rotate, so that the ejector rod is prevented from rotating under the action of unscrewing torque.

Furthermore, the elastic ejection assembly further comprises a mounting seat arranged in the mounting cavity, and two ends of the elastic piece are respectively contacted with the limiting protrusions and the mounting seat.

The mounting seat is convenient for limiting the elastic piece.

Furthermore, the side wall of the limiting seat is connected with the side wall of the cutter body in a sealing mode through threads.

When the limiting seat is connected with the cutter body through the threads, the connection between the limiting seat and the cutter body is more reliable, and when the limiting seat is connected with the cutter body through the radial connecting piece, the rotation between the limiting seat and the cutter body can be avoided. The limiting seat can be connected with the cutter body in a sealing mode through threads, scrap iron is prevented from entering the mounting cavity, and cooling liquid can be prevented from entering the material collecting cavity from the connecting position between the limiting seat and the cutter body, so that the cooling liquid flows in a set channel.

Further, the radial connecting member is a threaded pin or a screw.

Furthermore, the slope surface is formed on the inner side wall of the first installation body or the second installation body, and two sides of the slope surface extend to the inner side wall of the corresponding installation body.

The slope surface of the invention can not form a step with the inner side wall of the mounting body, thereby ensuring the structural continuity of the inner side of the mounting body and ensuring that waste materials can not be clamped in the material collecting cavity due to the structural incoherence.

Further, the maximum inclination of the slope surface is 5 °.

Further, the first mounting body and the second mounting body are arranged around the axis of the cutter body at equal intervals.

The invention has the following beneficial effects:

(1) after the hole digging cutter finishes the hole digging operation, when the waste is extruded, the waste can be stressed unevenly on one side, the waste can be conveniently ejected out of the material collecting cavity, and the phenomenon of material blocking is avoided.

(2) When the hole digging cutter is used for cutting operation, the elastic ejection assembly and the cutter body cannot loosen under the action of unscrewing torque, so that the elastic ejection assembly is prevented from losing efficacy due to loosening, and the phenomenon of material clamping is avoided.

Drawings

FIG. 1 is a schematic external structural view of a hole drilling tool for machining large-diameter assembly holes of aviation parts, which is disclosed by the invention;

FIG. 2 is a schematic diagram of the internal structure of the hole digging cutter for machining large-diameter assembly holes of aviation parts;

FIG. 3 is a schematic view of the structure of the cutter body of the present invention;

fig. 4 is a schematic structural diagram of the elastic ejection assembly of the present invention.

In the figure: 10-a cutter body; 11-a cutting end; 12-a clamping end; 13-mounting a cavity; 15-a material collecting cavity; 16-slope surface; 20-an elastic ejection assembly; 21-a limiting seat; 22-a mandril; 23-an elastic member; 24-a limit bump; 25-a mounting seat; 26-a radial connector; 30-a blade; 141-a first mounting body; 142-second mounting body.

Detailed Description

The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.