An internally cooled step forming drill for hydraulic transmission valves

Abstract

This utility model proposes an internally cooled stepped forming drill for hydraulic transmission valves, comprising a cutting edge and a shank. The cutting edge includes a main cutting edge, a flank face, a stepped surface, multiple stepped angles, and a chip removal groove. The main cutting edge is spirally arranged from the front end of the cutting edge to the rear end. A flank face is provided on one side of the main cutting edge, and a chip removal groove is provided on the side of the main cutting edge away from the flank face. The stepped angles include a first stepped angle, a second stepped angle, and a third stepped angle, which are sequentially located on the side of the cutting edge. A stepped surface parallel to the cutting edge is provided between adjacent stepped angles. The first stepped angle is located near the rear end of the cutting edge and is an inwardly concave barb-shaped R-angle, making the sealing ring less prone to damage and slippage. An internal cooling channel runs through the cutting edge and the shank, and the internal cooling channel of the cutting edge extends outward at intervals with internal cooling branches to ensure cooling effect.

Description

Technical Field

[0001] The utility model relates to the technical field of drill bits, and more specifically to an internally cooled stepped forming drill for a hydraulic transmission valve. Background Art

[0002] As an important component of machining tools, drill bits are mainly used for rough machining of holes. With the development of the machinery industry, users have put forward higher requirements for product processing quality, processing reliability, processing efficiency, and tool delivery time. Step drills are widely used in hole processing. They are composed of a group of drill bits with different diameters according to certain design requirements. They can realize drilling and chamfering of a group of holes with different diameters. Step holes with different diameters can be drilled at one time without changing drill bits with different diameters, which greatly improves production efficiency.

[0003] An existing step drill, such as the utility model patent with announcement number CN 209272574 U, discloses an internally cooled step drill for processing the inner hole of an alloy structural steel joint, comprising a blade and a shank, wherein the blade comprises a top angle, a drill tip, an end blade, an end blade flank, an R angle, a step surface, a step angle, a formed step angle 1, a formed step angle 2, a back portion and a chip groove, wherein the top angle is arranged at the front end of the blade, the drill tip is arranged at the rear side of the top angle, the end blade is arranged between the drill tip and the R angle, the step surface is arranged at the rear side of the R angle, the formed step angle 1 and the formed step angle 2 are arranged in sequence at the rear side of the step surface, the back portion extends from the end blade flank to the rear end of the blade, and the chip groove extends from the rear side of the end blade to the rear end of the blade.

[0004] However, when it is necessary to process the hydraulic transmission valve, a sealing ring needs to be placed on the step drill to ensure sealing. However, the step angle, forming step angle 1, and forming step angle 2 in this design are not suitable for adding sealing rings, which may easily cause them to fall off, and when the tool is larger, the internal cooling effect will be reduced. Utility Model Content

[0005] In view of this, in order to solve the above problems, the utility model proposes an internal cooling step forming drill for a hydraulic transmission valve, which ensures sealing by setting an inwardly concave undercut R angle, and sets an internal cooling branch channel on the basis of the internal cooling channel to ensure the cooling effect.

[0006] An internally cooled stepped profile drill for a hydraulic transmission valve comprises a blade 1 and a shank 2, wherein the blade 1 comprises a main cutting edge 3, a back face 4, a step face, a plurality of step angles and a chip groove 8, wherein the main cutting edge 3 is spirally arranged from the front end of the blade 1 to the rear end of the blade 1, a back face 4 is arranged on one side of the main cutting edge 3, and a chip groove 8 is arranged on the side of the main cutting edge 3 away from the back face 4, wherein the step angle comprises a first step angle 5, a second step angle 6, and a third step angle 7, wherein the first step angle 5, the second step angle 6, and the third step angle 7 are arranged on the side of the blade 1 in sequence, and the diameter of the blade 1 where the first step angle 5 is located decreases step by step toward the second step angle 6 and the third step angle 7, and adjacent step angles are arranged at the same time. Step surfaces parallel to the blade 1 are provided between the step angles. The first step angle 5 is provided near the rear end of the blade 1. A sealing ring is sleeved on the outside of the first step angle 5. The first step angle 5 is an inwardly concave barbed R angle, and the first step angle 5 is 0.15±0.1°, so that the sealing ring is not easily damaged or slipped out. An internal cooling channel 9 runs through the blade 1 and the shank 2. The internal cooling channel 9 of the blade 1 has internal cooling branches 91 extending outward at intervals, which are used to cool the main cutting edge 3, so that the cooling effect is good when the workpiece is large.

[0007] Furthermore, the first step angle 5 has a first step surface 51 on one side close to the front section of the blade 1 and a step slope 52 on the other side. The step slope 52 is inclined toward the front end of the blade, and the radial angle between the step slope 52 and the blade 1 is 0-15°.

[0008] Furthermore, a protective angle 53 is provided on a side of the step slope 52 away from the first step angle 5. The protective angle 53 is an R angle, and the protective angle 53 is 0.25±0.1°, which is used to prevent hands from being cut.

[0009] Furthermore, the second step angle 6 is arranged between the first step surface 51 and the second step surface 61, and the second step angle 6 is 45±1.5°, which is convenient for the transmission shaft to transmit back and forth during hydraulic pressure, and is not easy to generate burrs and wear the transmission shaft.

[0010] Furthermore, the third step angle 7 is provided between the second step surface 61 and the third step surface 71, and the third step angle 7 is 30±1.5°. The third step angle 7 is used for hole expansion to facilitate internal hydraulic flow.

[0011] Furthermore, the flank surface 4 is provided with a first step flank surface 41 , a second step flank surface 42 , and a third step flank surface 43 in sequence.

[0012] Furthermore, a chamfer is provided at the rear end of the blade 1 near the handle 2, and the diameter of the rear end of the blade 1 is larger than the diameter of the handle 2 to prevent the blade from being damaged.

[0013] Furthermore, a second chamfer is provided at the rear end of the blade 1 near the protective corner 53 , and a third chamfer is provided at the front end of the blade 1 .

[0014] Furthermore, the rear end of the shank 2 is provided with an inner cooling hole, the inner cooling hole is connected to the inner cooling channel 9, the inner cooling branch channel 91 is arranged obliquely outward, and the inner cooling branch channel 91 is obliquely toward the front end of the blade 1.

[0015] Furthermore, the main cutting edge 3 is a double-edge, which can ensure the surface roughness of the inner hole.

[0016] Beneficial effects of the utility model: An internally cooled stepped profile drill for a hydraulic transmission valve comprises a blade 1 and a shank 2, wherein the blade 1 comprises a main cutting edge 3, a back face 4, a step face, a plurality of step angles and a chip removal groove 8, wherein the main cutting edge 3 is spirally arranged from the front end of the blade 1 to the rear end of the blade 1, a back face 4 is arranged on one side of the main cutting edge 3, a chip removal groove 8 is arranged on the side of the main cutting edge 3 away from the back face 4, and the step angle comprises a first step angle 5, a second step angle 6, and a third step angle 7, wherein the first step angle 5, the second step angle 6, and the third step angle 7 are arranged on the side of the blade 1 in sequence, and the diameter of the blade 1 where the first step angle 5 is located is gradually increased toward the second step angle 6 and the third step angle 7. Decreasingly, step surfaces parallel to the blade 1 are provided between adjacent step angles, the first step angle 5 is provided near the rear end of the blade 1, a sealing ring is sleeved on the outside of the first step angle 5, the first step angle 5 is an inwardly concave hook-shaped R angle, so that the sealing ring is not easy to be damaged and slip out, the blade 1 and the shank 2 are penetrated by an internal cooling channel 9, and the internal cooling channel 9 of the blade 1 is extended outwardly with internal cooling branches 91 at intervals, which are used to cool the main cutting edge 3, so that the cooling effect is good when the workpiece is large. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The utility model is a structural diagram of an internally cooled stepped forming drill for a hydraulic transmission valve.

[0018] Figure 2 It is an enlarged view of the blade of the internally cooled step profile drill for a hydraulic transmission valve of the utility model.

[0019] Figure 3 The utility model is a schematic diagram of the use state of the internal cooling step forming drill for the hydraulic transmission valve.

[0020] Main component symbols

[0021] Blade portion 1, shank portion 2, main cutting edge 3, flank surface 4, first step flank surface 41, second step flank surface 42, third step flank surface 43, first step angle 5, first step surface 51, step chamfer 52, protection angle 53, second step angle 6, second step surface 61, third step angle 7, third step surface 71, chip groove 8, internal cooling channel 9, internal cooling branch channel 91.

[0022] The following specific implementation manner will further illustrate the present utility model in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0023] like Figure 1 As shown in FIG. 1 , it is a structural diagram of an internally cooled step forming drill for a hydraulic transmission valve of the present invention; Figure 2 As shown, it is an enlarged view of the blade of the internally cooled step profile drill for hydraulic transmission valve of the utility model; Figure 3 The figure is a schematic diagram of the use state of the internal cooling step forming drill for the hydraulic transmission valve of the utility model. Example

[0024] An internally cooled stepped profile drill for a hydraulic transmission valve comprises a blade 1 and a shank 2, wherein the blade 1 comprises a main cutting edge 3, a back face 4, a step face, a plurality of step angles and a chip groove 8, wherein the main cutting edge 3 is spirally arranged from the front end of the blade 1 to the rear end of the blade 1, a back face 4 is arranged on one side of the main cutting edge 3, and a chip groove 8 is arranged on the side of the main cutting edge 3 away from the back face 4, wherein the step angle comprises a first step angle 5, a second step angle 6, and a third step angle 7, wherein the first step angle 5, the second step angle 6, and the third step angle 7 are arranged on the side of the blade 1 in sequence, and the diameter of the blade 1 where the first step angle 5 is located decreases step by step toward the second step angle 6 and the third step angle 7, and adjacent step angles are arranged at the same time. Step surfaces parallel to the blade 1 are provided between the step angles. The first step angle 5 is provided near the rear end of the blade 1. A sealing ring is sleeved on the outside of the first step angle 5. The first step angle 5 is an inwardly concave barbed R angle, and the first step angle 5 is 0.15±0.1°, so that the sealing ring is not easily damaged or slipped out. An internal cooling channel 9 runs through the blade 1 and the shank 2. The internal cooling channel 9 of the blade 1 has internal cooling branches 91 extending outward at intervals, which are used to cool the main cutting edge 3, so that the cooling effect is good when the workpiece is large.

[0025] The first step angle 5 has a first step surface 51 on one side close to the front section of the blade 1 and a step slope 52 on the other side. The step slope 52 is inclined toward the front end of the blade, and the radial angle between the step slope 52 and the blade 1 is 0-15°.

[0026] A protective angle 53 is provided on one side of the step slope 52 away from the first step angle 5. The protective angle 53 is an R angle and is 0.25±0.1° for preventing hands from being cut.

[0027] The second step angle 6 is arranged between the first step surface 51 and the second step surface 61 , and the second step angle 6 is 45±1.5°, which is convenient for the transmission shaft to transmit back and forth during hydraulic operation and is not prone to burrs and wear of the transmission shaft.

[0028] The third step angle 7 is provided between the second step surface 61 and the third step surface 71 , and the third step angle 7 is 30±1.5°. The third step angle 7 is used for expanding the hole to facilitate the internal flow of hydraulic fluid.

[0029] The flank surface 4 is provided with a first step flank surface 41 , a second step flank surface 42 , and a third step flank surface 43 in sequence.

[0030] A chamfer is provided at the rear end of the blade 1 near the handle 2. The diameter of the rear end of the blade 1 is larger than the diameter of the handle 2 to prevent the blade from being damaged.

[0031] A second chamfer is provided at the rear end of the blade 1 near the protective corner 53 , and a third chamfer is provided at the front end of the blade 1 .

[0032] The rear end of the shank 2 is provided with an inner cooling hole, which is connected to the inner cooling channel 9 . The inner cooling branch channel 91 is arranged obliquely outward, and the inner cooling branch channel 91 is obliquely toward the front end of the blade 1 .

[0033] The main cutting edge 3 is a double-edge edge, which can ensure the surface roughness of the inner hole.

[0034] Beneficial effects of the utility model: An internally cooled stepped profile drill for a hydraulic transmission valve comprises a blade 1 and a shank 2, wherein the blade 1 comprises a main cutting edge 3, a back face 4, a step face, a plurality of step angles and a chip removal groove 8, wherein the main cutting edge 3 is spirally arranged from the front end of the blade 1 to the rear end of the blade 1, a back face 4 is arranged on one side of the main cutting edge 3, a chip removal groove 8 is arranged on the side of the main cutting edge 3 away from the back face 4, and the step angle comprises a first step angle 5, a second step angle 6, and a third step angle 7, wherein the first step angle 5, the second step angle 6, and the third step angle 7 are arranged on the side of the blade 1 in sequence, and the diameter of the blade 1 where the first step angle 5 is located is gradually increased toward the second step angle 6 and the third step angle 7. Decreasingly, step surfaces parallel to the blade 1 are provided between adjacent step angles, the first step angle 5 is provided near the rear end of the blade 1, a sealing ring is sleeved on the outside of the first step angle 5, the first step angle 5 is an inwardly concave hook-shaped R angle, so that the sealing ring is not easy to be damaged and slip out, the blade 1 and the shank 2 are penetrated by an internal cooling channel 9, and the internal cooling channel 9 of the blade 1 is extended outwardly with internal cooling branches 91 at intervals, which are used to cool the main cutting edge 3, so that the cooling effect is good when the workpiece is large.

[0035] The above-mentioned embodiments only express several implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the utility model, and these all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. An internally cooled stepped profile drill for a hydraulic transmission valve, comprising a blade (1) and a shank (2), the blade (1) comprising a main cutting edge (3), a flank face (4), a step face, a plurality of step angles and a chip groove (8), the main cutting edge (3) being spirally arranged from the front end of the blade (1) to the rear end of the blade (1), a flank face (4) being provided on one side of the main cutting edge (3), and a chip groove (8) being provided on a side of the main cutting edge (3) away from the flank face (4), characterized in that: The step angles include a first step angle (5), a second step angle (6), and a third step angle (7). The first step angle (5), the second step angle (6), and the third step angle (7) are sequentially arranged on the side of the blade (1), and gradually decrease from the diameter of the blade (1) where the first step angle (5) is located to the second step angle (6) and the third step angle (7). A step surface parallel to the blade (1) is arranged between adjacent step angles. The first step angle (5) is arranged near the rear end of the blade (1). The first step angle (5) is an inwardly concave barbed R angle, and the first step angle (5) is 0.15±0.1°. An internal cooling channel (9) runs through the blade (1) and the shank (2). The internal cooling channel (9) of the blade (1) is provided with internal cooling branches (91) extending outward at intervals for cooling the main cutting edge (3).

2. The internally cooled step profile drill for a hydraulic transmission valve according to claim 1, characterized in that: One side of the first step angle (5) close to the front section of the blade (1) is a first step surface (51), and the other side is a step slope (52), the step slope (52) is inclined towards the front end of the blade, and the radial angle between the step slope (52) and the blade (1) is 0-15°.

3. The internally cooled step profile drill for a hydraulic transmission valve according to claim 2, characterized in that: A protection angle (53) is provided on a side of the step slope (52) away from the first step angle (5), the protection angle (53) is an R angle, and the protection angle (53) is 0.25±0.1°.

4. The internally cooled step profile drill for a hydraulic transmission valve according to claim 2, characterized in that: The second step angle (6) is provided between the first step surface (51) and the second step surface (61), and the second step angle (6) is 45±1.5°.

5. The internally cooled step profile drill for a hydraulic transmission valve according to claim 4, characterized in that: The third step angle (7) is arranged between the second step surface (61) and the third step surface (71), and the third step angle (7) is 30±1.5°.

6. The internally cooled step profile drill for a hydraulic transmission valve according to claim 1, characterized in that: The flank surface (4) is provided with a first step flank surface (41), a second step flank surface (42), and a third step flank surface (43) in sequence.

7. The internally cooled step profile drill for a hydraulic transmission valve according to claim 1, characterized in that: A chamfer is provided at the rear end of the blade (1) close to the shank (2), and the diameter of the rear end of the blade (1) is greater than the diameter of the shank (2).

8. The internally cooled step profile drill for a hydraulic transmission valve according to claim 3, characterized in that: A second chamfer is provided at the rear end of the blade portion (1) close to the protective corner (53), and a third chamfer is provided at the front end of the blade portion (1).

9. The internally cooled step profile drill for a hydraulic transmission valve according to claim 1, characterized in that: The rear end of the shank (2) is provided with an inner cooling hole, the inner cooling hole is connected to the inner cooling channel (9), the inner cooling branch channel (91) is arranged obliquely outward, and the inner cooling branch channel (91) is obliquely towards the front end of the blade (1).

10. The internally cooled step profile drill for a hydraulic transmission valve according to claim 1, characterized in that: The main cutting edge (3) is a double-edge.

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