CN215431695U - Punching press formula connects handle twist drill - Google Patents
Punching press formula connects handle twist drill Download PDFInfo
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- CN215431695U CN215431695U CN202120973864.7U CN202120973864U CN215431695U CN 215431695 U CN215431695 U CN 215431695U CN 202120973864 U CN202120973864 U CN 202120973864U CN 215431695 U CN215431695 U CN 215431695U
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- drill
- drill rod
- connecting part
- handle
- blind hole
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Abstract
The utility model relates to a punching type handle-connecting twist drill which comprises a drill rod and a drill handle connected with the tail end of the drill rod, wherein the front part of the drill rod is of a cylindrical structure of which the surface is provided with a spiral groove cutting edge, and the rear part of the drill rod is a connecting part used for being connected with the drill handle; the method is characterized in that: the connecting part is a cylinder, a concave plane area is milled on the outer circumferential surface of the connecting part, and the plane area extends to the end face of the tail end of the connecting part along the axis direction of the drill rod; a blind hole for connection is formed in the center of the end face of the front end of the drill shank through cold heading, the whole blind hole is a round hole for embedding a cylindrical body of the connection part, and a pressing body which is formed through punching and is protruded inwards is arranged in the middle of the inner wall of the blind hole; the connecting part of the drill rod is embedded into the blind hole, and the compression joint body is abutted against the plane area of the connecting part to realize the connection of the drill rod and the drill handle. The utility model has the advantages that: the plane area is matched with the compression joint body to prevent the drill rod from rotating in the drill shank, so that the drill rod can be prevented from being separated from the drill shank while torque is transferred, and glue bonding is not needed.
Description
Technical Field
Twist drills are tools for drilling round holes in workpieces by rotary cutting relative to a fixed axis, and are known as twist drills because the chip flutes are helical. The twist drill mainly comprises a drill rod with a cylindrical spiral groove cutting edge structure, a drill bit arranged at the front end of the drill rod and a connecting handle connected with the drill rod.
Background
The present twist drill drilling rod mainly has two kinds with the connection handle connected mode:
(1) the end of the drill rod is cylindrical, the center of the end face of the connecting handle is provided with a connecting blind hole which can just accommodate the drill rod in a cylindrical shape, a thread locking hole which is vertical to the axis of the connecting blind hole and is communicated with the blind hole is drilled on the side wall of the connecting handle, the end of the drill rod is embedded into the connecting handle and is connected onto the thread locking hole through a locking screw, and the end of the locking screw supports against the surface of the drill rod in the blind hole to realize the relative fixation of the connecting handle and the drill rod. The structure of the mode is complex, a thread locking hole needs to be additionally drilled and a locking screw needs to be connected, the processing, manufacturing and assembling procedures are complex, the cost is high, and the mode of lateral pressure locking is not beneficial to the coaxiality control of the drill rod and the connecting handle; in addition, need bore the screw locking hole perpendicular to the connecting handle axis on the lateral wall of connecting handle, this screw locking hole can damage the tensile strength of connecting handle, and mechanical properties influences to some extent, and product quality is unstable.
(2) For example, patent publication No. CN 209698105U discloses a shank-connected twist drill, wherein a regular polygon blind hole is drilled on the end face of the shank, and the rear end of the drill rod is processed into a regular polygon which is just embedded into the blind hole. The thread locking hole is eliminated, so that the whole processing procedure of the handle-connecting twist drill is simplified, and the influence of lateral locking on the coaxiality control of the drill handle and the drill rod can be avoided. It also has certain drawbacks: the whole section of the drill rod is circular, but the lower end of the drill rod needs to be processed into a regular polygon, so that the processing is still complex.
In addition, in order to avoid the separation of the drill rod and the connecting handle, glue is required to be coated in the blind hole for bonding, and the use of the glue puts higher requirements on the environmental protection.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a stamping type handle-connecting twist drill which is environment-friendly and high in coaxiality.
In order to solve the technical problems, the technical scheme of the utility model is as follows: a punching type handle-connected twist drill comprises a drill rod and a drill handle connected with the tail end of the drill rod, wherein the front part of the drill rod is of a cylindrical structure with a spiral groove cutting edge on the surface, and the rear part of the drill rod is a connecting part connected with the drill handle; the innovation points are as follows: the connecting part is a cylinder, a concave plane area is milled on the outer circumferential surface of the connecting part, and the plane area extends to the end face of the tail end of the connecting part along the axis direction of the drill rod; a blind hole for connection is formed in the center of the end face of the front end of the drill shank through cold heading, the whole blind hole is a round hole for embedding a cylindrical body of the connection part, and a pressing body which is formed through punching and is protruded inwards is arranged in the middle of the inner wall of the blind hole; the connecting part of the drill rod is embedded into the blind hole, and the compression joint body is abutted against the plane area of the connecting part to realize the connection of the drill rod and the drill handle. The cylindrical structure of the connecting part of the drill rod is embedded into the blind hole of the drill handle to ensure the coaxiality between the blind hole and the drill handle, a plane area is milled on the surface of the drill rod, the compression joint body in the blind hole is abutted against the plane area to prevent the drill rod from rotating in the drill handle, the torque transmission is realized, the drill rod can be prevented from being separated from the drill handle, and the bonding of glue is not needed.
The drill handle is provided with a pit just facing the outer surface of the compression joint body, the pit is a waist-shaped hole-shaped pit, and the pit can be used for better punch forming of the compression joint body and can also be used for marking and prompting a punching part.
Drawings
Fig. 1 is a schematic structural view of a punching type handle-connecting twist drill of the utility model.
Fig. 2 is a schematic view of the structure of the drill rod of the present invention.
Fig. 3 is a schematic view of the structure of the drill shank of the present invention.
Figure 4 is a cross-sectional view of a drill shank of the present invention.
Detailed Description
As shown in fig. 1, the punch type shank-connected twist drill of the present invention includes a drill rod 1 and a shank 2 connected to the end of the drill rod 1, the front portion of the drill rod 1 is a cylindrical structure having a helical flute land on the surface, and the rear portion of the drill rod 1 is a connection portion for connecting to the shank 2.
In the present invention, as shown in fig. 2, the connection portion of the drill rod 1 is a cylinder, and a recessed flat area 11 is milled on the outer circumferential surface of the connection portion, and the flat area 11 extends to the end face of the connection portion in the direction of the drill rod axis.
As shown in fig. 3 and 4, a blind hole 21 for connection is formed in the center of the front end face of the drill shank 2 by cold heading, the whole blind hole 21 is a circular hole for embedding a cylindrical body of the connection part, and a press-connection body 22 which is formed by punching and protrudes inwards is arranged in the middle of the inner wall of the blind hole;
when the drill rod 1 and the drill handle 2 are connected, the connecting part of the drill rod 1 is embedded into the blind hole, then the drill rod and the drill handle are placed on a punching machine, punching is carried out outside the blind hole of the drill handle 2, and a compression joint body 22 which is propped against the plane area 11 of the connecting part is formed in the blind hole, so that the connection of the drill rod 1 and the drill handle 2 is realized.
In order to better process the crimp body 22 and ensure the connection between the crimp body 22 and the drill rod connection portion, in the present embodiment, a concave pit 23 is provided on the outer surface of the drill shank 2 facing the crimp body, and the concave pit 23 is a kidney-shaped hole-shaped concave pit.
Claims (3)
1. A punching type handle-connected twist drill comprises a drill rod and a drill handle connected with the tail end of the drill rod, wherein the front part of the drill rod is of a cylindrical structure with a spiral groove cutting edge on the surface, and the rear part of the drill rod is a connecting part connected with the drill handle; the drilling rod is characterized in that the connecting part is a cylinder, a concave plane area is milled on the outer circumferential surface of the connecting part, and the plane area extends to the end face of the tail end of the connecting part along the axial direction of the drilling rod; a blind hole for connection is formed in the center of the end face of the front end of the drill shank through cold heading, the whole blind hole is a round hole for embedding a cylindrical body of the connection part, and a pressing body which is formed through punching and is protruded inwards is arranged in the middle of the inner wall of the blind hole; the connecting part of the drill rod is embedded into the blind hole, and the compression joint body is abutted against the plane area of the connecting part to realize the connection of the drill rod and the drill handle.
2. The punch-type shank-connected twist drill according to claim 1, wherein: and a pit is arranged on the outer surface of the drill handle, which is opposite to the pressure joint body.
3. The punch-type shank-connected twist drill according to claim 2, wherein: the pits are waist-shaped hole-shaped pits.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120973864.7U CN215431695U (en) | 2021-05-08 | 2021-05-08 | Punching press formula connects handle twist drill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120973864.7U CN215431695U (en) | 2021-05-08 | 2021-05-08 | Punching press formula connects handle twist drill |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215431695U true CN215431695U (en) | 2022-01-07 |
Family
ID=79706722
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120973864.7U Active CN215431695U (en) | 2021-05-08 | 2021-05-08 | Punching press formula connects handle twist drill |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215431695U (en) |
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2021
- 2021-05-08 CN CN202120973864.7U patent/CN215431695U/en active Active
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