Valve seat step drill bit

Abstract

The utility model discloses a valve seat step drill bit for processing a valve body sealing structure, which comprises a drill bit handle part and a drill bit cutting part, and the drill bit cutting part comprises a drilling part for drilling and a milling part for milling an orifice which are integrally formed. When the valve hole and the end face of the hole opening are machined through the same cutter, the problem of successive cutter path connection does not exist, connection cutter marks can be prevented from occurring at the cutter path connection position in the machining process, and the sealing effect between the elastic sealing piece and valve seat spare and accessory parts is improved.

Description

[Technical field]

[0002] The utility model relates to the field of mechanical processing, in particular to a one-time forming processing tool for processing a valve body sealing structure. [Background technology]

[0004] In mechanical processing, the sealing part between the valve hole and the hole end step needs to be processed to adapt to the sealing of the elastic seal and the valve seat spare parts. In the existing spare parts processing, the drilling of the drill and the processing of the hole end face are processed in steps. Since the tool has the problem of the intersection of the tool paths in the step-by-step processing, the sealing effect between the elastic seal and the valve seat spare parts is poor. [Utility Model Content]

[0006] In order to solve the above technical problems, the utility model provides a special tool for forming a hole and an orifice end surface in one step, so as to improve the sealing effect between the sealing element and the valve seat sealing part.

[0007] The valve seat step drill bit of the utility model comprises a drill bit shank portion and a drill bit cutting portion, wherein the drill bit cutting portion comprises an integrally formed drilling portion for drilling holes and a milling portion for milling orifices.

[0008] A valve seat step drill as described above, wherein the drilling portion is provided with a drilling blade for drilling the valve seat valve hole, the milling portion is provided with a milling blade for milling the valve seat orifice end face and the external milling radius is larger than the maximum drilling radius of the drilling blade, a sealing portion cutting edge connecting the outer end of the drilling blade and the inner end of the milling blade is provided between the drilling blade and the milling blade, and the sealing portion cutting edge includes an arc-shaped blade at the connection with the milling blade.

[0009] In the valve seat step drill as described above, the drill shank and the drill cutting portion are coaxial.

[0010] In a valve seat step drill as described above, a straight blade parallel to the cutter head rotation axis is provided between the arc blade and the drilling blade, the milling blade is perpendicular to the cutter head rotation axis, and the intersection of the extension line of the straight blade and the sealing part cutting edge falls on the arc blade edge.

[0011] In the valve seat step drill bit as described above, the arc-shaped blade and the cutting edges of the drilling blade, the straight blade and the milling blade are arranged on the same plane.

[0012] In the valve seat step drill as described above, a chip removal groove is provided between the adjacent arc-shaped edge and the drilling edge, the straight edge and the milling edge.

[0013] In the valve seat step drill bit as described above, the angle between the drilling blade and the rotation axis of the cutter head is α, and the angle α is set between 68° and 72°.

[0014] In the valve seat step drill bit as described above, the angle α between the drilling edge and the rotation axis of the cutter head is set to 70°.

[0015] Compared with the prior art, the utility model has the following advantages:

[0016] 1. The cutting part of the drill bit of the utility model is integrally formed, and the valve hole and the end face of the orifice are processed by the same tool during processing, so as to avoid the occurrence of connecting knife marks at the intersection of the knife paths during the processing;

[0017] 2. The arc-shaped blade of the utility model is arranged at the connection between the cutting edge of the sealing part and the milling blade, and a continuous arc-shaped structure can be milled out at the sealing part of the valve body, thereby improving the sealing effect between the elastic sealing part and the sealing part of the valve body;

[0018] 3. The arc blade of the utility model is arranged on the same plane as the drilling blade, straight blade and milling blade. There is no problem of the intersection of the successive tool paths during step-by-step processing, which can improve the sealing effect between the elastic seal and the valve seat parts.

[0019] 4. The drill handle and the drill cutting part of the utility model are coaxial, which can transmit the torque required for processing and ensure that the processing position is on the same axis;

Brief Description of the Drawings

[0021] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0022] Figure 1 It is a schematic diagram of the structure of the utility model;

[0023] Figure 2 This is an enlarged view of the structure of part A of the utility model;

[0024] Figure 3 It is a three-dimensional structural schematic diagram of the utility model. [Specific implementation method]

[0026] In order to make the technical problems, technical solutions and beneficial effects solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0027] Combination Figure 1 and Figure 2As shown, the valve seat step drill of the utility model comprises a drill shank 1 and a drill cutting portion 2; the drill cutting portion 2 comprises an integrally formed drilling portion 21 for drilling holes and a milling portion 22 for milling the orifice. The valve hole and the orifice end face are processed with the same tool to avoid the occurrence of connection marks at the intersection of the tool paths during the processing, thereby improving the sealing effect between the seal and the valve body sealing portion.

[0028] Furthermore, as a preferred implementation mode of the present invention but not a limitation, the drill shank 1 is coaxial with the drill cutting portion 2, and the drill shank 1 can transmit the torque required for the work after clamping, while ensuring that the processing position is on the same axis.

[0029] In this embodiment, the drilling portion 21 is provided with a drilling blade 211 for drilling a valve seat valve hole, and the milling portion 22 is provided with a milling blade 221 for milling the end face of the valve seat orifice and the external milling radius is greater than the maximum drilling radius of the drilling blade 211. A sealing portion cutting edge 222 connecting the outer end of the drilling blade 211 and the inner end of the milling blade 221 is provided between the drilling blade 211 and the milling blade 221. The sealing portion cutting edge 222 includes an arc-shaped blade 2221 at the connection with the milling blade 221. There is no tool path intersection at the valve body sealing portion in the step milling process, and an arc structure cooperating with the seal is milled out to improve the sealing effect of the valve body sealing portion and the seal.

[0030] In this embodiment, a straight blade 2222 parallel to the rotation axis of the cutter head is provided between the arc blade 2221 and the drilling blade 211, the milling blade 221 is perpendicular to the rotation axis of the cutter head, and the intersection of the extension line of the straight blade 2222 and the sealing cutting edge 222 falls on the cutting edge of the arc blade 2221. The cutting edges of the arc blade 2221, the drilling blade 211, the straight blade 2222, and the milling blade 221 are arranged on the same plane, and there is no problem of successive tool path intersection during step-by-step processing, thereby improving the sealing effect between the seal and the valve seat parts.

[0031] Furthermore, as a preferred embodiment of the present invention but not a limitation, a chip removal groove 5 is provided between the adjacent arc-shaped edge 2221 and the drilling edge 211, the straight edge 2222, and the milling edge 221, so that the accumulated chips generated during the machining process can be discharged, and coolant can also be fed to reduce the cutting temperature and flush the accumulated chips.

[0032] Furthermore, as a preferred implementation mode of the present invention rather than a limitation, the angle between the drilling blade 211 of the valve seat step drill bit of the present invention and the axis of rotation of the cutter head is α, and the angle α is set between 68° and 72°, so that the cutting force can be concentrated in front of the drilling blade 211 during cutting.

[0033] Furthermore, as a preferred implementation mode of the present invention rather than a limitation, the angle α between the drilling blade 211 and the axis of rotation of the cutter head of the valve seat step drill bit of the present invention is set to 70°, so that the cutting force is concentrated in front of the drilling blade 211 when the drill bit is fed, thereby slowing down the wear rate of the drill bit.

[0034] This implementation case works as follows:

[0035] When the utility model is used for processing, the drill shank 1 is clamped on the power providing device and transmits the torque to the drill cutting part 2. The drilling part 21 and the milling part 22 of the drill cutting part are integrally formed. When processing the valve hole and the orifice end face, the same tool is used for processing. The drilling blade 211 opens a hole in the valve seat. When the drilling reaches a specified depth, the arc blade 2221 and the sealing part cutting blade 222 located in the same plane as the drilling blade 211 and the straight blade 2222 can be formed at one time when milling the valve seat orifice end face, and an arc structure is milled at the sealing part and the orifice end face is drilled and milled.

[0036] The above is an implementation method provided in combination with specific content, and it is not considered that the specific implementation of this application is limited to these instructions. At the same time, due to different industry naming, it is not limited to the above naming, nor is it limited to English naming. Any similarity or similarity with the method, structure, etc. of this application, or a number of technical deductions or replacements made based on the concept of this application, shall be deemed to be within the scope of protection of this application.

Claims

1. A valve seat step drill bit, comprising a drill shank (1) and a drill cutting portion (2), characterized in that: The drill bit cutting portion (2) comprises an integrally formed drilling portion (21) for drilling holes and a milling portion (22) for milling hole openings.

2. The valve seat step drill bit according to claim 1, characterized in that: The drilling portion (21) is provided with a drilling blade (211) for drilling a valve seat valve hole, the milling portion (22) is provided with a milling blade (221) for milling the end face of the valve seat orifice and the external milling radius is greater than the maximum drilling radius of the drilling blade (211), a sealing portion cutting blade (222) is provided between the drilling blade (211) and the milling blade (221) to connect the outer end of the drilling blade (211) and the inner end of the milling blade (221), and the sealing portion cutting blade (222) includes an arc-shaped blade (2221) at the connection with the milling blade (221).

3. The valve seat step drill bit according to claim 1, characterized in that: The drill shank (1) and the drill cutting portion (2) are coaxial.

4. The valve seat step drill bit according to claim 2, characterized in that: A straight blade (2222) parallel to the rotation axis of the cutter head is provided between the arc-shaped blade (2221) and the drilling blade (211); the milling blade (221) is perpendicular to the rotation axis of the cutter head; and the intersection of the extension line of the straight blade (2222) and the sealing cutting blade (222) falls on the edge of the arc-shaped blade (2221).

5. The valve seat step drill bit according to claim 4, characterized in that: The cutting edges of the arc-shaped blade (2221), the drilling blade (211), the straight blade (2222), and the milling blade (221) are arranged on the same plane.

6. The valve seat step drill bit according to claim 4, characterized in that: A chip removal groove (3) is provided between the adjacent arc-shaped blade (2221) and the drilling blade (211), the straight blade (2222), and the milling blade (221).

7. The valve seat step drill bit according to claim 4, characterized in that: The included angle between the drilling blade (211) and the rotation axis of the cutter head is α, and the angle α is set between 68° and 72°.

8. The valve seat step drill bit according to claim 7, characterized in that: The included angle α between the drilling blade (211) and the rotation axis of the cutter head is 70°.

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