High-precision self-lubricating tap

Abstract

The utility model provides a high accuracy self -lubricating tap, relates to composite tap technical field, including tap handle and tap head, the outer wall of tap head is integrally formed with cutting edge, the direction of cutting edge is opposite with the thread direction of tap head, tap handle is provided with lubricating cavity, the middle part of lubricating cavity is provided with the partition baffle, the lubricating cavity is divided into extrusion oil cavity and cutting oil cavity by the partition baffle, the downside of extrusion oil cavity and cutting oil cavity is provided with the communicating hole respectively, the downside of partition baffle is rotatably installed with eccentric valve piece, the eccentric valve piece is provided with the valve hole corresponding with communicating hole, the tap head is provided with the oil guide pipe of communicating with lubricating cavity, cutting edge is provided with a plurality of lubricating holes. The utility model can carry out cutting to the volcanic crater produced by extruding tapping, solves the problem of assembly interference, and provides the lubricating oil of different properties respectively through the different turning of extrusion and cutting, improves the service life of tap.

Description

Technical Field

[0001] This utility model relates to the field of composite tap technology, specifically a high-precision self-lubricating tap. Background Technology

[0002] Tapping is a relatively inefficient machining process. In internal thread machining, compared with cutting taps, forming taps have advantages such as no chips, high thread strength, and high precision. In recent years, they have also been used in special structures such as titanium alloys and high-temperature alloys.

[0003] For example, the utility model patent with announcement number CN222448595U discloses a self-lubricating extrusion tap. By using a structure of lubricating ball, lubricating hole, elastic element, lubricating cavity and blocking column, the lubricating ball is squeezed during the tapping process, and the lubricating fluid inside the lubricating cavity seeps out through the gap between the squeezed lubricating ball and the lubricating hole, thus achieving a self-lubricating effect and effectively extending the service life of the tap.

[0004] However, in the above-mentioned technical solution, the extrusion tap forms a "crater" shaped tooth gap during the tapping process due to the plastic flow of the material. The tooth gap is higher than the small diameter of the wire hole, which causes assembly interference and affects the assembly sealing. Deburring or chamfering processes are required after tapping, which increases production time and cost. Utility Model Content

[0005] (a) Technical problems to be solved

[0006] To address the shortcomings of existing technologies, this invention provides a high-precision self-lubricating tap, which solves the problems mentioned in the background section.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, this utility model provides the following technical solution:

[0009] A high-precision self-lubricating tap includes an integrally formed tap shank and tap head. The outer wall of the tap head has several cutting grooves, and a cutting edge is integrally formed in each cutting groove. The orientation of the cutting edge is opposite to the thread direction of the tap head. The cutting edge includes a front cutting surface and a rear lubrication surface. A chip removal groove is formed between the cutting surface and the side wall of the cutting groove. The tap shank is provided with a lubrication cavity, and an oil guide tube communicating with the lubrication cavity is provided in the tap head. Several lubrication holes are provided on the lubrication surface.

[0010] Preferably, a partition baffle is provided in the middle of the lubrication cavity, which divides the lubrication cavity into an extrusion oil cavity and a cutting oil cavity. The extrusion oil cavity and the cutting oil cavity are respectively provided with connecting holes on their lower sides. An eccentric valve plate is rotatably installed on the lower side of the partition baffle. A return torsion spring is connected between the eccentric valve plate and the tap shank. A valve hole corresponding to the connecting hole is eccentrically provided on the eccentric valve plate.

[0011] Preferably, the top of the oil guide pipe is provided with a variable diameter groove, and the inner diameter of the top of the variable diameter groove is larger than the radius of the valve hole.

[0012] Preferably, the inner side of the tap shank is provided with a rotating groove communicating with the connecting hole, the eccentric valve plate is rotatably connected in the rotating groove, the eccentric valve plate slides against the lower side of the rotating groove, and the reset torsion spring is connected between the eccentric valve plate and the lower side wall of the rotating groove.

[0013] Preferably, the outer edge of the eccentric valve plate is provided with an eccentric semi-ring, and the inner wall of the rotating groove is provided with a positioning block. When the end of the eccentric semi-ring abuts against the positioning block, the valve hole and the hole are connected and aligned with each other.

[0014] Preferably, the sidewalls of the extrusion oil chamber and the cutting oil chamber are provided with oil injection holes, and plugs are installed in the oil injection holes.

[0015] (III) Beneficial Effects

[0016] This invention provides a high-precision self-lubricating tap. It has the following beneficial effects:

[0017] 1. In this utility model, the forward rotation of the tap can be used for extrusion tapping and drilling. During the rotation, the lubricating surface of the cutting edge can slide within the original bottom hole and abut against the inner side of the screw thread, avoiding excessive deformation of the screw thread during the extrusion process. When the tap rotates in the reverse direction, the tip of the cutting edge forms a "volcano" shaped tooth gap due to extrusion, which corrects the small diameter of the tapping hole, solves the assembly interference problem, and achieves zero-gap planar sealing. Furthermore, through the extrusion tapping and volcano cutting processing method, the strength of the tapping hole is guaranteed, and excessive chips are avoided.

[0018] 2. In this utility model, the forward and reverse rotation of the tap and the inertial deflection of the eccentric valve plate enable different types of lubricating oil to be used for different directions. When extruding in the forward direction, the extrusion oil chamber is connected, and high-adhesion lubricant can be provided through the lubrication hole to reduce friction. When cutting in the reverse direction, the cutting oil chamber is connected, and low-viscosity oil can be quickly penetrated and cooled. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a high-precision self-lubricating tap according to the present invention;

[0020] Figure 2This is a partial cross-sectional view of the tap shank in this utility model;

[0021] Figure 3 This is a schematic diagram of the eccentric valve plate in this utility model;

[0022] Figure 4 This is a partial cross-sectional view of the rotating groove in this utility model.

[0023] In the diagram: 1. Tap shank; 2. Tap head; 3. Cutting edge; 4. Separator baffle; 5. Extrusion oil chamber; 6. Cutting oil chamber; 7. Connecting hole; 8. Variable diameter groove; 9. Oil guide pipe; 10. Lubrication hole; 11. Eccentric valve plate; 12. Valve hole; 13. Return torsion spring; 14. Eccentric semi-ring; 15. Positioning block; 16. Plug. Detailed Implementation

[0024] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0025] This utility model embodiment provides a high-precision self-lubricating tap, such as Figure 1-4 As shown, the device includes an integrally formed tap shank 1 and a tap head 2. The outer wall of the tap head 2 has several cutting grooves, and a cutting edge 3 is integrally formed within each cutting groove. The orientation of the cutting edge 3 is opposite to the thread direction of the tap head 2. The cutting edge 3 includes a front cutting surface and a rear lubrication surface. A chip removal groove is formed between the cutting surface and the side wall of the cutting groove. The tap shank 1 has a lubrication cavity, and a partition baffle 4 is provided in the middle of the lubrication cavity. The partition baffle 4 divides the lubrication cavity into a compression oil cavity 5 and a cutting oil cavity 6. The compression oil cavity 5 is filled with a highly adhesive lubricant to reduce friction during compression tapping. The cutting oil chamber 6 is filled with low-viscosity lubricating oil for rapid penetration and cooling. Oil injection holes are provided on the side walls of the extrusion oil chamber 5 and the cutting oil chamber 6, and plugs 16 are installed in the oil injection holes. Connecting holes 7 are respectively provided on the lower sides of the extrusion oil chamber 5 and the cutting oil chamber 6. A rotating groove communicating with the connecting hole 7 is opened on the inner side of the tap shank 1. A diameter-changing groove 8 is provided on the lower side of the rotating groove and is connected to it. An oil guide pipe 9 communicating with the lubrication chamber is opened inside the tap head 2. The diameter-changing groove 8 is located on the top of the oil guide pipe 9. Several lubrication holes 10 communicating with the oil guide pipe 9 are provided on the lubrication surface.

[0026] An eccentric valve plate 11 is rotatably mounted within the rotating groove. The eccentric valve plate 11 slides and abuts against the lower side of the rotating groove. An eccentric valve hole 12, corresponding to the connecting hole 7, is eccentrically provided on the eccentric valve plate 11. A return torsion spring 13 connects the eccentric valve plate 11 to the lower side wall of the rotating groove. The return torsion spring 13 keeps the eccentric valve plate 11 in a centered position, i.e., a position where the valve hole 12 is not connected to either of the two connecting holes 7. The inner diameter of the top of the variable diameter groove 8 is larger than the radius of the valve hole 12, allowing lubricating oil to enter the variable diameter groove 8 along the valve hole 12 and flow into the oil guide pipe 9, achieving self-lubrication under the action of centrifugal force. An eccentric semi-ring 14 is provided on the outer edge of the eccentric valve plate 11, and a positioning block 15 is provided on the inner wall of the rotating groove. When the end of the eccentric semi-ring 14 abuts against the positioning block 15, the valve hole 12 and the hole are aligned with each other. That is, when the tap rotates forward, the eccentric semi-ring 14 will rotate to the side that abuts against the positioning block 15 under the action of inertia. At this time, the valve hole 12 is connected to the connecting hole 7 on the lower side of the extrusion oil chamber 5. When the tap rotates in reverse, the eccentric semi-ring 14 will rotate to the other side that abuts against the positioning block 15 under the action of inertia. At this time, the valve hole 12 is connected to the connecting hole 7 on the lower side of the cutting oil chamber 6. Through the above operation, different properties of lubricating oil can be provided when the tap rotates forward and in reverse, which is suitable for extrusion tapping and volcano cutting.

[0027] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-precision self-lubricating tap, comprising an integrally formed tap shank and tap head, wherein the outer wall of the tap head is provided with a plurality of cutting straight grooves, characterized in that: The cutting groove has an integrally formed cutting edge, the direction of which is opposite to the thread direction of the tap. The cutting edge includes a front cutting surface and a rear lubrication surface. A chip removal groove is formed between the cutting surface and the side wall of the cutting groove. The tap shank is provided with a lubrication cavity. An oil guide tube communicating with the lubrication cavity is opened in the tap. Several lubrication holes are provided on the lubrication surface.

2. The high-precision self-lubricating tap according to claim 1, characterized in that: A partition baffle is provided in the middle of the lubrication chamber, which divides the lubrication chamber into an extrusion oil chamber and a cutting oil chamber. The extrusion oil chamber and the cutting oil chamber are respectively provided with connecting holes on their lower sides. An eccentric valve plate is rotatably installed on the lower side of the partition baffle. A return torsion spring is connected between the eccentric valve plate and the tap shank. A valve hole corresponding to the connecting hole is eccentrically provided on the eccentric valve plate.

3. The high-precision self-lubricating tap according to claim 2, characterized in that: The top of the oil guide pipe is provided with a variable diameter groove, and the inner diameter of the top of the variable diameter groove is larger than the radius of the valve hole.

4. A high-precision self-lubricating tap according to claim 3, characterized in that: The inner side of the tap shank is provided with a rotating groove that communicates with the connecting hole. The eccentric valve plate is rotatably connected in the rotating groove. The eccentric valve plate slides and abuts against the lower side of the rotating groove. The reset torsion spring is connected between the eccentric valve plate and the lower side wall of the rotating groove.

5. A high-precision self-lubricating tap according to claim 4, characterized in that: An eccentric semi-ring is provided on the outer edge of the eccentric valve plate, and a positioning block is provided on the inner wall of the rotating groove. When the end of the eccentric semi-ring abuts against the positioning block, the valve hole and the hole are connected and aligned with each other.

6. A high-precision self-lubricating tap according to claim 5, characterized in that: The side walls of the extrusion oil chamber and the cutting oil chamber are provided with oil injection holes, and plugs are installed in the oil injection holes.

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