CN217648569U - Flat drill convenient for chip removal - Google Patents
Flat drill convenient for chip removal Download PDFInfo
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- CN217648569U CN217648569U CN202220480227.0U CN202220480227U CN217648569U CN 217648569 U CN217648569 U CN 217648569U CN 202220480227 U CN202220480227 U CN 202220480227U CN 217648569 U CN217648569 U CN 217648569U
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- curved surface
- drill
- cutting head
- flat
- guide surface
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Abstract
The utility model relates to a flat drill convenient to chip removal, include the drillstock and install the platykurtic cutting head on drillstock top, its characterized in that: defining a main area on one side of a front angle of the secondary cutting edge on the flat cutting head as a first curved surface and a main area on the other side as a second curved surface; a guide surface is arranged between the first curved surface and the second curved surface, the front end of the guide surface is positioned on one side of the axis of the drill shank, and the rear end of the guide surface is positioned on the other side of the axis of the drill shank. The utility model has the advantages that: when the chisel edge of the flat cutting head cuts the bottom of the deep hole and the secondary cutting edge cuts the hole wall of the deep hole to generate wood chips, the wood chips positioned at the first curved surface are guided to the second curved surface at the other side through the guide surface to be discharged.
Description
Technical Field
The utility model relates to a flat drill, in particular to flat drill convenient to chip removal.
Background
The woodworking flat drill is mainly used for processing deep holes, the cutting part of the flat drill is processed into a flat body or an approximate flat body, namely a flat cutting head 1, and a main cutting edge on the top surface of the flat body is usually transversely arranged, namely a chisel edge 11; the minor cutting edges 12 on both sides of the flat body are used to control the drill diameter. The woodworking flat drill is provided with a positioning threaded drill point in the center for convenient processing and is used for positioning during drilling.
In some flat drills, a chip discharge structure is provided in order to discharge cut chips, and as shown in fig. 1 and 2, a step is provided on the surface of a flat cutting head 1 of the flat drill, a guide surface of the step is positioned from the center as a chip discharge chute 13 for discharging chips, and the chip discharge chute 13 is gradually inclined from the center of the flat cutting head to the outer side of the flat cutting head in the direction from the center of the center positioning drill tip to the end of the drill shank.
As shown in fig. 3 and 4, the width of the protrusion 14 extending from the middle of the flat cutting head 1 to the end of the drill shank gradually increases, and the wood chips discharged from the side are guided to the outside of the same side by using a gradually changing concave area formed between the protrusion 14 and the two side areas as a chip groove structure.
Like the chip groove design of above-mentioned structure, the homonymy chip removal that present spade drill chip groove all adopted, the saw-dust of cutting with the chisel edge 11 of one side, vice cutting edge 12 all is drawn forth from this side promptly (see fig. 4), and its structural design is simple, and processing is convenient, but the shortcoming that exists is: the discharged sawdust is located in front of the flat body of the rotary flat drill, is located in the advancing direction of the flat body, is usually extruded after cutting more, and has relatively poor chip removal efficiency.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide a smooth and easy flat drill of chip removal.
In order to solve the technical problem, the utility model adopts the technical scheme that: the utility model provides a spade drill convenient to chip removal, includes the drillstock and installs the platykurtic cutting head on the drillstock top, the platykurtic cutting head is including being located platykurtic cutting head upper end center and boring with the central point location of the coaxial setting of drillstock, and relative drillstock central symmetry sets up two secondary cutting edges at platykurtic cutting head both sides face to and connect the chisel edge between secondary cutting edge top and central point location brill bottom, and its innovation point lies in: two surfaces which are symmetrical relative to the center of the axis of the drill shank on the flat cutting head are defined as main surfaces, the main surfaces take the axis of the drill shank as a boundary line, a main area on one side of a rake angle of the secondary cutting edge is a first curved surface, and a main area on the other side of the rake angle is a second curved surface; and a guide surface is arranged between the first curved surface and the second curved surface, the guide surface extends from the front to the back from the lower part of the central positioning drill of the flat cutting head to the lower end of the flat cutting head, the front end of the guide surface is positioned on one side of the axis of the drill shank, and the rear end of the guide surface is positioned on the other side of the axis of the drill shank. When the chisel edge of the flat cutting head cuts the bottom of the deep hole and the secondary cutting edge cuts the hole wall of the deep hole to generate wood chips, the wood chips positioned at the first curved surface are guided to the second curved surface at the other side through the guide surface to be discharged.
The guide surface is designed to be a curved surface which is in smooth transition with the first curved surface and the second curved surface, so that the stress of the flat drill is more reasonable, and the sawdust is not easy to block.
Drawings
Fig. 1 is a front view of a first prior art spade drill with a chip removal structure.
Fig. 2 is a perspective view of a first spade drill with a chip removal structure in the background art.
Fig. 3 is a perspective view of a second spade drill with a chip removal structure in the background art.
Fig. 4 is a chip removal schematic diagram of a second spade drill with a chip removal structure in the background art.
Fig. 5 is a front view of the middle spade drill of the present invention.
Fig. 6 is a side view of the middle spade drill of the present invention.
Fig. 7 is a perspective view of the middle spade drill of the present invention.
Fig. 8 is a chip removal schematic diagram of the middle flat drill of the present invention.
Detailed Description
As shown in 5~7, the flat drill of the present invention includes a flat cutting head 1 and a drill shank 2, the flat cutting head 1 is mounted on the top end of the drill shank 2, the flat cutting head 1 includes a center positioning drill 14 located at the center of the upper end of the flat cutting head and coaxially disposed with the drill shank, two secondary cutting edges 12 symmetrically disposed on two side surfaces of the flat cutting head 1 relative to the center of the drill shank 2, and a chisel 11 connected between the top end of the secondary cutting edge 12 and the bottom end of the center positioning drill 14.
Defining two surfaces which are symmetrical relative to the center of the axis of the drill shank on the flat cutting head as main surfaces, wherein the main surfaces take the axis of the drill shank as a boundary line, a main area on one side of a front angle of a secondary cutting edge 12 is a first curved surface a, and a main area on the other side of the front angle is a second curved surface b; between the first curved surface a and the second curved surface b, there is a guide surface c, which extends from the front to the back from below the central positioning drill 14 of the flat cutting head 1 to the lower end of the flat cutting head 1, and the front end c1 of the guide surface c is located on one side of the axis of the drill shank 2, and the rear end c2 of the guide surface c is located on the other side of the axis of the drill shank.
When the chisel edge 11 of the flat cutting head cuts the bottom of the deep hole and the secondary cutting edge 12 cuts the wall of the deep hole to generate chips, as shown in fig. 8, the chips located on the first curved surface a are guided to the second curved surface b on the other side through the guide surface and discharged.
The utility model discloses in, establish the spigot surface into with the equal rounding off's of first curved surface, second curved surface for the atress of flat drill is more reasonable, the difficult jamming of discharge of saw-dust.
Claims (2)
1. The utility model provides a spade drill convenient to chip removal, includes the drillstock and installs the platykurtic cutting head on the drillstock top, the platykurtic cutting head is including being located platykurtic cutting head upper end center and boring with the central positioning of the coaxial setting of drillstock, and relative drillstock central symmetry sets up two secondary cutting edges at platykurtic cutting head both sides face to and connect the chisel edge between secondary cutting edge top and central positioning drill bottom, its characterized in that: two surfaces which are symmetrical relative to the center of the axis of the drill handle on the flat cutting head are defined as main surfaces, the main surfaces take the axis of the drill handle as a boundary line, a main area on one side of a front angle of a secondary cutting edge is a first curved surface, and a main area on the other side of the front angle of the secondary cutting edge is a second curved surface; and a guide surface is arranged between the first curved surface and the second curved surface, the guide surface extends from the front to the back from the lower part of the central positioning drill of the flat cutting head to the lower end of the flat cutting head, the front end of the guide surface is positioned on the side of the first curved surface on one side of the axis of the drill shank, and the rear end of the guide surface is positioned below the second curved surface on the other side of the axis of the drill shank.
2. The spade drill facilitating chip removal according to claim 1 wherein: the guide surface is a curved surface in smooth transition with the first curved surface and the second curved surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220480227.0U CN217648569U (en) | 2022-03-07 | 2022-03-07 | Flat drill convenient for chip removal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220480227.0U CN217648569U (en) | 2022-03-07 | 2022-03-07 | Flat drill convenient for chip removal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217648569U true CN217648569U (en) | 2022-10-25 |
Family
ID=83661323
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220480227.0U Active CN217648569U (en) | 2022-03-07 | 2022-03-07 | Flat drill convenient for chip removal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217648569U (en) |
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2022
- 2022-03-07 CN CN202220480227.0U patent/CN217648569U/en active Active
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