Novel flat-bottom U-shaped drill

Abstract

The utility model provides a novel U-shaped drill with a flat bottom, and belongs to the technical field of machining tools. The problems that an existing bottoming drill is single in function, poor in heat dissipation effect during machining and large in drilling resistance are solved. The novel flat-bottom U-shaped drill comprises a cutter bar and a cutter handle, two spiral grooves are formed in the cutter bar, an inner blade and an outer blade are arranged at the upper end of the cutter bar, and blade grooves for installing the inner blade and the outer blade respectively are formed in the positions, corresponding to the inner blade and the outer blade, of the cutter bar. The inner blade and the outer blade are fixedly installed in a blade groove of the cutter bar through fixing screws, a water outlet hole is formed in the rear cutter face of the cutter bar, and the tool cutting edge angle of the inner blade and the tool cutting edge angle of the outer blade are set to be 1 degree.

Description

Technical Field

[0001] The utility model belongs to the technical field of machining tools and relates to a U drill, in particular to a novel flat-bottom U drill. Background Art

[0002] At present, when processing some flat bottom holes, it is necessary to equip a flat bottom drill bit. A flat bottom drill bit is a drill bit used to drill flat bottom holes. Flat bottom drill bits can be used to process free-cut steel, aluminum alloy, plastic, etc.

[0003] The existing flat bottom drill has a single function, has poor heat dissipation effect and large drilling resistance during processing, and its drill cuttings cannot be effectively discharged, has poor stability and low processing efficiency. Summary of the invention

[0004] The utility model aims to solve the above problems in the prior art and provides a novel flat bottom U drill with a flat bottom for processing.

[0005] The purpose of the utility model can be achieved through the following technical solutions: a new type of flat-bottom U drill, including a tool rod and a tool handle, characterized in that two spiral grooves are opened on the tool rod, an inner blade and an outer blade are arranged on the upper end of the tool rod, and blade grooves for installing the inner blade and the outer blade are opened on the tool rod at positions relative to the inner blade and the outer blade, respectively, the inner blade and the outer blade are fixedly installed in the blade groove of the tool rod by fixing screws, a water outlet is opened on the back blade surface of the tool rod, and the main rake angle of the blade on the inner blade and the outer blade is set to 1 degree.

[0006] In the above-mentioned novel flat-bottom U-drill, the handle is provided with a water inlet hole, and the two water outlet holes are connected to the water inlet hole and are arranged in a Y-shaped structure.

[0007] In the above-mentioned novel flat-bottom U drill, the shape of the blade groove is the same as the shape of the inner blade and the outer blade.

[0008] In the above-mentioned novel flat-bottom U-drill, the tool rod and the tool handle are arranged as an integrally formed structure.

[0009] Compared with the prior art, this new flat bottom U drill has the following advantages:

[0010] 1. The main deflection angle of the inner blade and the outer blade is 1 degree, so that the bottom surface processed by the utility model is flat.

[0011] 2. The arrangement of the two water outlet holes facilitates the heat dissipation of the blade when the tool is processing the workpiece, thereby increasing the service life of the utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1It is a structural schematic diagram of the utility model.

[0013] Figure 2 It is a cross-sectional structural schematic diagram of the utility model.

[0014] In the figure, 1. knife bar; 2. knife handle; 3. inner blade; 4. outer blade; 5. spiral groove; 6. blade groove; 7. fixing screw; 8. water outlet; 9. water inlet. DETAILED DESCRIPTION

[0015] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0016] like Figure 1 , Figure 2 As shown, the novel flat bottom U drill comprises a tool bar 1 and a tool handle 2. The tool bar 1 is provided with two spiral grooves 5. The spiral grooves 5 can guide and remove the iron chips generated during the processing to prevent the iron chips from scratching the surface of the processed workpiece during the processing. The upper end of the tool bar 1 is provided with an inner blade 3 and an outer blade 4. The tool bar 1 is provided with a blade groove 6 for installing the inner blade 3 and the outer blade 4 respectively at a position relative to the inner blade 3 and the outer blade 4. The inner blade 3 and the outer blade 4 are fixedly installed in the blade groove 6 of the tool bar 1 by fixing screws 7. A water outlet 8 is provided on the back face of the tool bar 1. The main deflection angle of the blade on the inner blade 3 and the outer blade 4 is set to 1 degree. The main deflection angle of the blade is set to 1 degree (±0.5 degrees) to achieve the function of processing a flat bottom.

[0017] To further elaborate, a water inlet hole 9 is provided on the handle 2, and the two water outlet holes 8 are connected to the water inlet hole 9 and are arranged in a Y-shaped structure.

[0018] In further detail, the shape of the blade groove 6 is the same as that of the inner blade 3 and the outer blade 4, and the inner blade 3 and the outer blade 4 are installed.

[0019] To be more specific, the shank 1 and the handle 2 are integrally formed.

[0020] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0021] Although the terms such as the knife bar 1, knife handle 2, inner blade 3, outer blade 4, spiral groove 5, blade groove 6, fixing screw 7, water outlet 8, water inlet 9, etc. are used more frequently in this article, the possibility of using other terms is not excluded. The use of these terms is only for more convenient description and explanation of the essence of the utility model; interpreting them as any additional restrictions is contrary to the spirit of the utility model.

Claims

1. A novel flat bottom U drill, comprising a tool bar (1) and a tool handle (2), characterized in that: The knife bar (1) is provided with two spiral grooves (5), an inner blade (3) and an outer blade (4) are arranged at the upper end of the knife bar (1), a blade groove (6) for installing the inner blade (3) and the outer blade (4) is provided on the knife bar (1) at a position relative to the inner blade (3) and the outer blade (4), the inner blade (3) and the outer blade (4) are fixedly installed in the blade groove (6) of the knife bar (1) by fixing screws (7), a water outlet hole (8) is provided on the back blade surface of the knife bar (1), and the main rake angle of the blade on the inner blade (3) and the outer blade (4) is set to 1 degree.

2. A novel flat bottom U drill according to claim 1, characterized in that: The knife handle (2) is provided with a water inlet hole (9), and the two water outlet holes (8) are connected to the water inlet hole (9) and are arranged in a Y-shaped structure.

3. A novel flat bottom U drill according to claim 1, characterized in that: The shape of the blade groove (6) is the same as the shape of the inner blade (3) and the outer blade (4).

4. A novel flat bottom U drill according to claim 1, characterized in that: The knife bar (1) and the knife handle (2) are arranged as an integrally formed structure.

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