CN114871471A

CN114871471A - Auxiliary device for ensuring hole-making verticality of handheld drilling tool

Info

Publication number: CN114871471A
Application number: CN202210616823.1A
Authority: CN
Inventors: 李华溢; 张永亮; 杨巍; 王子健
Original assignee: Shenyang Aircraft Industry Group Co Ltd
Current assignee: Shenyang Aircraft Industry Group Co Ltd
Priority date: 2022-06-01
Filing date: 2022-06-01
Publication date: 2022-08-09

Abstract

The invention discloses an auxiliary device for ensuring hole-making verticality of a handheld drilling tool, which comprises a drill bit, a bearing cover, a bearing round sleeve, a transition round sleeve, a positioning pin and a bearing, wherein a bearing positioned by the bearing cover is arranged in the bearing round sleeve, and an inner ring of the bearing is fixedly connected with the outer circular surface of the drill bit; the transition round sleeve at the lower end of the bearing round sleeve extends into the positioning round sleeve, and the outer side of the positioning round sleeve is provided with a sliding opening; the positioning pin penetrates through the sliding port and then is connected to the transition round sleeve so as to limit the transition round sleeve; the lower end surface of the positioning round sleeve is a plane, and the sharp point of the drill bit is flush with the lower end surface of the positioning round sleeve; springs are arranged outside the transition round sleeve and between the bearing round sleeve and the positioning round sleeve. Has the following advantages: 1. the accurate and stable control of the hole-making verticality can be realized. 2. Can be connected with a drilling bit to realize one-hand operation. 3. The rotating part and the static part of the hole making system can be connected through the bearing, so that the friction resistance and the energy loss are reduced, and the service life is prolonged.

Description

Auxiliary device for ensuring hole-making verticality of handheld drilling tool

Technical Field

The invention belongs to the technical field of machining hole making, relates to an auxiliary device for ensuring hole making verticality of a handheld drilling tool, and can be widely applied to manual hole making operation in the fields of equipment manufacturing and the like.

Background

In the field of equipment manufacturing, particularly aerospace product manufacturing, due to factors such as size and component coordination, tens of thousands of assembly connecting holes require an operator to drill and match partially assembled parts on an assembly fixture. Due to the characteristics of complex structure, more closed cavities and the like of aviation products, large-scale automatic hole making equipment does not have an operation space under most conditions, and more than 80% of assembly connecting holes need to be processed by a manual hand-held drilling tool according to statistics.

The drill bit of the manual handheld drilling tool is in point contact with the processed surface, the turning freedom degree of the drill bit cannot be limited by equipment during working, and the hole making verticality can be guaranteed only by depending on the holding state of an operator, so that the hole making quality is greatly influenced by human factors, and the stable hole making verticality precision is hardly guaranteed. In general, the centerline of the rivet hole should be perpendicular to the part surface, and the deviation of the hole centerline creates a plane clearance of no more than 0.05mm between the rivet head plane and the part surface. Taking a common rivet with a stem diameter of 4mm and a head diameter of about 8mm as an example, it is calculated to allow only 0.35 degree of deflection of the rivet bottom hole axis. Once the hole-making verticality does not meet the technical indexes, the following hidden dangers can be caused: 1. the interference between the bolt rod and the screw rod and the connected part is caused, and the smooth assembly cannot be realized; 2. the bolt head, the screw head and the joint surface are not attached, so that the connection strength and reliability are influenced; 3. resulting in a stress assembly of the component and the connector, affecting fatigue strength.

Disclosure of Invention

The invention aims to provide an auxiliary device capable of being operated by one hand and ensuring hole-making verticality and stability of a handheld drilling tool.

The technical scheme adopted by the invention is as follows: the device comprises a drill bit, a bearing cover, a bearing round sleeve and a transition round sleeve which are of an upper-lower integrated structure, a positioning round sleeve, a positioning pin and a bearing; the method is characterized in that: a bearing positioned by a bearing end cover is arranged in the bearing circular sleeve, and the bearing inner ring is fixedly connected with the outer circular surface of the drill bit; the transition round sleeve at the lower end of the bearing round sleeve extends into the positioning round sleeve, and the outer side of the positioning round sleeve is provided with a sliding opening; the positioning pin penetrates through the sliding port and then is connected to the transition round sleeve so as to limit the transition round sleeve; the lower end surface of the positioning round sleeve is a plane, and the sharp point of the drill bit is flush with the lower end surface of the positioning round sleeve; springs are arranged outside the transition round sleeve and between the bearing round sleeve and the positioning round sleeve.

By adopting the structure, when the drilling tool is used, the cylindrical end at the tail part of the drill bit is connected with the handheld hole making tool and clamped tightly, the lower plane of the positioning circular sleeve is contacted with the surface of the processed part and tightly attached to the surface of the processed part, the situation that the positioning circular sleeve cannot be laterally turned is ensured, the handheld hole making tool is switched on, the hole making tool is manually pushed, the spring is pressed downwards, the bearing circular sleeve and the transition circular sleeve move downwards along the sliding opening, and the drill bit tip extends outwards from the lower end of the positioning circular sleeve until the surface of the processed part is drilled thoroughly. Because the bearing circle cover and the transition circle cover of a body structure, the location circle cover is the cylinder structure, after spacing together through spring and locating pin between them, form holistic big cylinder structure, overall structure stability is stronger, the drill bit that circles in the bearing circle cover inner race keeps perpendicularly with location circle cover lower end plane, and keep perpendicularly all the time at the boring tool promotion in-process, the upset degree of boring tool has been restricted, make the drill bit can only follow self axis rotation, guarantee boring tool axis stability, and then realized the control function of boring straightness and stability.

The invention has the following advantages: 1. the invention can realize accurate and stable control of hole-making verticality. 2. The invention is connected with the drilling bit, can realize one-hand operation and is more beneficial to drilling in narrow space. 3. According to the invention, the rotating part and the static part of the hole making system are connected through the bearing, so that the friction resistance and the energy loss are reduced, and the service life is prolonged.

Drawings

FIG. 1 is a schematic external view of the present invention;

FIG. 2 is a schematic view of the internal structure of the present invention;

fig. 3 is a working state diagram of the present invention.

Detailed Description

As shown in fig. 1 and 2, the present invention includes a drill bit 1, a bearing cap 2, a bearing circular sleeve 3 and a transition circular sleeve 8 integrally connected up and down, a positioning circular sleeve 5, a positioning pin 6, and a bearing 7. And a bearing 7 positioned by the bearing end cover 2 is arranged in the bearing circular sleeve 3, and the inner ring of the bearing 7 is fixedly connected with the outer circular surface of the drill bit 1. The transition round sleeve 8 at the lower end of the bearing round sleeve 3 extends into the positioning round sleeve 5, and the outer side of the positioning round sleeve 5 is provided with a sliding opening 10. The positioning pin 6 penetrates through the sliding opening 10 and then is connected to the transition round sleeve 8 so as to limit the transition round sleeve 8; the lower end surface of the positioning round sleeve 5 is a plane, and the sharp point of the drill bit 1 is flush with the lower end surface of the positioning round sleeve 5. And springs 4 are arranged on the outer side of the transition round sleeve 8 and between the bearing round sleeve and the positioning round sleeve so as to increase the damping feedback feeling when the hole making tool is manually pushed, and automatic return is realized after the manual pushing is finished. The outer circular surface of the drill bit 1 is fixedly connected to the inner ring of the bearing 7 through interference fit. The bearing end cover 2 is installed at the upper end of the bearing circular sleeve 3 through a bolt 9 so as to limit the bearing 7. The side of location circle cover 5 be equipped with window 11, make things convenient for the operator to detect the system hole state and chip removal.

As shown in fig. 3, tens of thousands of drilling work are usually required in equipment assembly, especially in aviation products, and most drilling work is performed by an operator holding a pneumatic or electric drilling tool in a top-down or bottom-up posture. The operator needs to manually complete the hole making work by adopting the upward-looking posture, and only the following operations need to be completed by adopting the device of the invention:

step S1: and a drill bit is installed to ensure that the tip of the drill bit is flush with the lower end plane of the positioning round sleeve in the spring relaxation state.

Step S2: the cylindrical end at the tail part of the drill bit is connected with the handheld hole making tool and clamped tightly, so that the drill bit and the handheld hole making tool are connected stably and do not shake.

Step S3: the plane of the lower end of the positioning circular sleeve is in contact with and closely attached to the surface of the processed part, so that the positioning circular sleeve cannot be laterally turned.

Step S4: and observing the hole-making position mark through the window, and aligning the drill point of the drill bit to the processed part.

Step S5: and pressing a working switch of the hole making tool, manually pushing the drill bit along the axial direction after the rotating speed of the drill bit is stable within a set range, and compressing the spring until the surface of the part to be processed is drilled.

Step S6: and drawing back the drill bit along the reverse feeding direction to completely separate the drill bit from the processed surface to finish hole making.

Claims

1. An auxiliary device for ensuring hole-making verticality of a handheld drilling tool comprises a drill bit (1), a bearing cover (2), a bearing round sleeve (3) and a transition round sleeve (8) which are of an upper-lower integrated structure, a positioning round sleeve (5), a positioning pin (6) and a bearing (7); the method is characterized in that: a bearing (7) positioned by a bearing end cover (2) is arranged in the bearing circular sleeve (3), and the inner ring of the bearing (7) is fixedly connected with the outer circular surface of the drill bit (1); a transition round sleeve (8) at the lower end of the bearing round sleeve (3) extends into the positioning round sleeve (5), and a sliding opening (10) is arranged at the outer side of the positioning round sleeve (5); the positioning pin (6) penetrates into the sliding opening (10) and then is connected to the transition round sleeve (8) so as to limit the transition round sleeve (8); the lower end surface of the positioning round sleeve (5) is a plane, and the sharp point of the drill bit (1) is flush with the lower end surface of the positioning round sleeve (5); springs (6) are arranged on the outer side of the transition round sleeve (8) and between the bearing round sleeve (3) and the positioning round sleeve (5).

2. The auxiliary device for ensuring the perpendicularity of hole making of the hand-held drilling tool as claimed in claim 1, wherein the auxiliary device comprises: the outer circular surface of the drill bit (1) is fixedly connected to the inner ring of the bearing (7) through interference fit.

3. The auxiliary device for ensuring the perpendicularity of hole making of the hand-held drilling tool as claimed in claim 1, wherein: the bearing end cover (2) is installed at the upper end of the bearing circular sleeve (3) through a bolt (9).

4. The auxiliary device for ensuring the perpendicularity of hole making of the hand-held drilling tool as claimed in claim 1, wherein: the side surface of the positioning round sleeve (5) is provided with a window (11).