Self-lubricating extrusion tap

Abstract

The utility model provides a self-lubricating extrusion screw tap, and belongs to the field of screw taps. The problem that an existing screw tap is poor in lubricating effect is solved. The self-lubricating extrusion tap comprises a tap handle and a tap head, the tap handle and the tap head are of an integrally-formed structure, a plurality of straight grooves are formed in the tap head, a lubricating cavity is formed in the tap head, an oil injection hole communicated with the lubricating cavity is formed in the center of the end of the tap head, and a plug is arranged in the oil injection hole. The lubricating cavity is filled with lubricating liquid, a plurality of lubricating mechanisms used for self-lubricating tapping of the screw tap are arranged at the groove bottom of the straight groove, and each lubricating mechanism comprises a lubricating ball movably arranged at the groove bottom of the straight groove, an elastic piece used for elastic reset of the lubricating ball and a lubricating hole matched with the lubricating ball. A blocking column used for limiting installation of the elastic piece and limiting movement of the lubricating ball is located in the lubricating cavity, and a plurality of limiting grooves used for limiting installation of the elastic piece are formed in the blocking column. The utility model has the advantage of self-lubricating effect.

Description

Technical Field

[0001] The utility model belongs to the field of taps and relates to a tap, in particular to a self-lubricating extrusion tap. Background Art

[0002] Tapping is a process with low processing efficiency. Compared with cutting taps, extrusion taps have the advantages of no chips, high thread strength, and high precision in internal thread processing. They are widely used in materials with good plasticity such as aluminum alloy, low carbon steel, and stainless steel. In recent years, they are also used in special structures such as titanium alloy and high temperature alloy. However, during the thread extrusion process, serious friction occurs between the tap and the workpiece, resulting in insufficient lubrication, easy adhesion, and high torque. Summary of the invention

[0003] The purpose of the utility model is to provide a self-lubricating extrusion tap to solve the above problems existing in the prior art.

[0004] The purpose of the utility model can be achieved through the following technical solutions: a self-lubricating extrusion tap, comprising a tap shank and a tap head, wherein the tap shank and the tap head are integrally formed, and the tap head is provided with a plurality of straight grooves for tapping and chip removal, characterized in that a lubrication cavity for storing lubricating liquid is provided in the tap head, an oil filling hole connected to the lubrication cavity is provided at the center of the end of the tap head, and a plug is provided in the oil filling hole;

[0005] The lubrication cavity is filled with lubrication liquid;

[0006] The straight groove bottom is provided with a plurality of lubrication mechanisms for self-lubrication of the taps;

[0007] The lubrication mechanism comprises a lubrication ball movably arranged on the bottom of the straight groove, an elastic member for elastically resetting the lubrication ball, and a lubrication hole cooperating with the lubrication ball;

[0008] A blocking column is provided in the lubricating cavity for limiting the installation of the elastic member and for limiting the movement of the lubricating ball. The blocking column is provided with a plurality of limiting grooves for limiting the installation of the elastic member.

[0009] In the above-mentioned self-lubricating extrusion tap, several lubrication mechanisms are axially spaced and distributed in sequence along the bottom of the straight groove, the cross-section of the lubrication hole is arranged in an "eight" structure, the lubrication ball is located in the lubrication hole, and a part of it passes through the bottom of the straight groove.

[0010] In the above-mentioned self-lubricating extrusion tap, the number of the straight grooves is 4, and the blocking column can be arranged in a cylindrical structure or a quadrilateral structure.

[0011] In the above-mentioned self-lubricating extrusion tap, the elastic member is installed against the limiting groove, the distance between the blocking column and the inner wall of the installation cavity is smaller than the radius of the lubricating ball, and the other end of the elastic member is connected against the lubricating ball.

[0012] In the above-mentioned self-lubricating extrusion tap, the lubricating ball seals the lubrication hole through the elastic characteristics of the elastic member.

[0013] Compared with the prior art, the self-lubricating extrusion tap has a simple structural design. By utilizing the cooperation of a lubricating ball, a lubricating hole, an elastic part, a lubricating cavity and a blocking column structure, the lubricating ball can be squeezed during the tapping process, so that the lubricating liquid inside the lubricating cavity can seep out through the gap between the squeezed lubricating ball and the lubricating hole, thereby achieving a self-lubricating effect and effectively extending the service life of the tap. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a three-dimensional structural schematic diagram of the self-lubricating extrusion tap.

[0015] Figure 2 It is a schematic diagram of the half-section structure of the self-lubricating extrusion tap.

[0016] Figure 3 yes Figure 1 Schematic diagram of the local enlarged structure at point A in the middle.

[0017] In the figure, 1, tap shank; 2, tap head; 3, straight groove; 4, lubrication chamber; 5, oil filling hole; 6, plug; 7, lubrication ball; 8, lubrication hole; 9, elastic part; 10, limit groove. DETAILED DESCRIPTION

[0018] 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.

[0019] like Figure 1 , Figure 2 , Figure 3As shown, the self-lubricating extrusion tap comprises a tap shank 1 and a tap head 2, wherein the tap shank 1 and the tap head 2 are integrally formed structures, wherein the tap head 2 is provided with a plurality of straight grooves 3 for chip removal from tapping, wherein the tap head 2 is provided with a lubrication cavity 4 for storing lubricating liquid, wherein an oil filling hole 5 connected to the lubrication cavity 4 is provided at the center of the end of the tap head 2, wherein a plug 6 is provided in the oil filling hole 5, wherein the lubrication cavity 4 is filled with lubricating liquid, wherein the bottom of the straight groove 3 is provided with a plurality of lubrication mechanisms for self-lubrication of the tap, wherein the lubrication mechanisms comprise a lubrication ball 7 movably provided on the bottom of the straight groove 3, and a lubrication ball 7 for elastically resetting the lubrication ball 7. The lubricating ball 7 is provided with an elastic member 9 and a lubricating hole 8 which cooperates with the lubricating ball 7. A blocking column is provided in the lubricating cavity 4 for limiting the installation of the elastic member 9 and for limiting the movement of the lubricating ball 7. The blocking column has a plurality of limiting grooves 10 for limiting the installation of the elastic member 9. The above structure is simple in design. By cooperating with the lubricating ball 7, the lubricating hole 8, the elastic member 9, the lubricating cavity 4 and the blocking column structure, the lubricating ball 7 can be squeezed by force during the tapping process, so that the lubricating liquid in the lubricating cavity 4 can penetrate through the gap between the squeezed lubricating ball 7 and the lubricating hole 8, thereby achieving a self-lubricating effect and effectively extending the service life of the tap.

[0020] To elaborate further, in order to facilitate the penetration of the lubricating liquid during the tapping process and achieve a self-lubricating effect, a number of lubrication mechanisms are axially spaced in sequence along the bottom of the straight groove 3, and the cross-section of the lubrication hole 8 is arranged in an "eight" structure. The lubrication ball 7 is located in the lubrication hole 8, and a part of it passes through the bottom of the straight groove 3.

[0021] To further elaborate, in order to limit the movement of the lubricating ball 7, the number of the straight grooves 3 is 4, and the blocking column can be set in a cylindrical structure or a quadrilateral structure.

[0022] To further elaborate, in order to prevent the lubricating ball 7 from being displaced after being squeezed, the elastic member 9 is installed against the limiting groove 10, the distance between the blocking column and the inner wall of the installation cavity is smaller than the radius of the lubricating ball 7, and the other end of the elastic member 9 is connected against the lubricating ball 7.

[0023] Preferably, the lubricating ball 7 seals the lubricating hole 8 through the elastic characteristics of the elastic member 9 .

[0024] 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.

[0025] Although the terms such as tap handle 1, tap head 2, straight groove 3, lubrication cavity 4, oil filling hole 5, plug 6, lubrication ball 7, lubrication hole 8, elastic member 9, and limit groove 10 are frequently used in this article, the possibility of using other terms is not excluded. The use of these terms is only for the purpose of more conveniently describing and explaining the essence of the utility model; interpreting them as any additional restrictions is contrary to the spirit of the utility model.

Claims

1. A self-lubricating extrusion tap, comprising a tap shank (1) and a tap head (2), wherein the tap shank (1) and the tap head (2) are integrally formed, and the tap head (2) is provided with a plurality of straight grooves (3) for chip removal during tapping, characterized in that: The tap head (2) is provided with a lubrication cavity (4) for storing lubricating liquid, and an oil filling hole (5) connected to the lubrication cavity (4) is provided at the center of the end of the tap head (2), and a plug (6) is provided in the oil filling hole (5); The lubricating cavity (4) is filled with lubricating liquid; The bottom of the straight groove (3) is provided with a plurality of lubrication mechanisms for self-lubrication of the tap; The lubrication mechanism comprises a lubrication ball (7) movably arranged on the bottom of the straight groove (3), an elastic member (9) for elastically resetting the lubrication ball (7), and a lubrication hole (8) cooperating with the lubrication ball (7); A blocking column is provided in the lubricating cavity (4) for limiting the installation of the elastic member (9) and for limiting the movement of the lubricating ball (7), and the blocking column has a plurality of limiting grooves (10) for limiting the installation of the elastic member (9).

2. A self-lubricating extrusion tap according to claim 1, characterized in that: A plurality of the lubricating mechanisms are axially spaced and distributed in sequence along the bottom of the straight groove (3); the cross section of the lubricating hole (8) is arranged in an "eight" structure; the lubricating ball (7) is located in the lubricating hole (8) and a portion of it passes through the bottom of the straight groove (3).

3. A self-lubricating extrusion tap according to claim 1, characterized in that: The number of the straight grooves (3) is 4, and the blocking column can be arranged in a cylindrical structure or a quadrilateral structure.

4. The self-lubricating extrusion tap according to claim 1, characterized in that: The elastic member (9) is installed in abutment with the limiting groove (10), the distance between the blocking column and the inner wall of the installation cavity is smaller than the radius of the lubricating ball (7), and the other end of the elastic member (9) is connected to the lubricating ball (7).

5. The self-lubricating extrusion tap according to claim 1, characterized in that: The lubricating ball (7) seals the lubricating hole (8) through the elastic characteristics of the elastic member (9).

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