CN113210755A

CN113210755A - Tapping assembly and tapping method

Info

Publication number: CN113210755A
Application number: CN202110502851.6A
Authority: CN
Inventors: 牛卫祥; 熊朝林; 庞柯; 钟玉民; 高凯迪; 龙仕伟
Original assignee: Ahwit Precision Shanghai Co ltd
Current assignee: Ahwit Precision Shanghai Co ltd
Priority date: 2021-05-10
Filing date: 2021-05-10
Publication date: 2021-08-06
Anticipated expiration: 2041-05-10
Also published as: CN113210755B

Abstract

The invention discloses a tapping component and a tapping method, relating to the technical field of mechanical production and processing, the tapping component comprises a tapping handle, the right side wall of the tapping handle is uniformly and fixedly connected with a cutting edge, the left end of the cutting edge is provided with a back angle, the outer wall of the tapping handle is connected with a sleeve in a sliding way, the left end of the sleeve is connected with a limit ring, through the mode, the invention can accurately position the center of the tap by inserting the sleeve into the threaded bottom hole, quickly straighten the back angle by tapping, is not limited to the specific structure of the outer surface of the tapping, then the relief angle performs the pre-opening of the thread groove on the thread bottom hole, finally the cutting edge performs the continuous tapping on the thread groove pre-opened by the thread groove, the quick manual tapping machine can be used for quickly and manually tapping small-batch workpieces or large-scale workpieces, the one-time tapping qualified rate is guaranteed to be more than 99%, the instability of manual tapping is solved, and the requirement on the technical level of an operator is low.

Description

Tapping assembly and tapping method

Technical Field

The invention relates to the technical field of mechanical production and processing, in particular to a tapping assembly and a tapping method.

Background

With the development of the mechanical industry, precision machine tool equipment is widely applied, and a plurality of multifunctional equipment is more and more, so that all processes can be basically completed in one process, and turning, milling, drilling, tapping and boring can be completed in one process. The requirements on processing of large-batch workpieces can be completely met, but the investment on small-batch workpieces is large, and if the investment on equipment, a tool clamp and the like is excessive, the output benefit is influenced, and the processing is often divided into a plurality of procedures.

Tapping is a common processing method in mechanical production and processing, and in the processing process of a relatively large casting, a place needing thread processing is often encountered, the casting is sometimes special in shape or large in shape, tapping is not easy to be performed by a machine tool or special equipment, and threads are required to be processed manually, but thread deflection is easily caused when threads are processed manually, so that the threads cannot be used, product performance is influenced, or products are scrapped, and therefore, the technical requirement of an operator for manual tapping is high.

The workpiece shown in fig. 3 is a casting, the product shape distance is 1000mm, the two end faces of the threads are inclined planes, the workpiece is not easy to be fixedly processed on a machine tool and a tapping machine, for the threads of the casting, because the product is large, the product value is high, when the initial tapping is carried out, an experienced teacher is found for tapping, but the first tooth slightly deflects during tapping, so that the deflection of the back-section threads is serious, and the efficiency is very low. The production rate is sometimes less than 60% of the first-time qualified rate, and the conventional tapping method for the thread has low tapping efficiency and low qualified rate.

Therefore, a tapping assembly and a tapping method are proposed to solve the above problems.

Disclosure of Invention

The present invention is directed to a tapping assembly and a tapping method to solve the above problems.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a tapping subassembly, includes the tap handle, the even fixedly connected with cutting edge of right side wall of tap handle, the relief angle has been seted up to the left end of cutting edge, the outer wall sliding connection of tap handle has the sleeve, telescopic left end is connected with the spacing ring.

Furthermore, the inner diameter of the sleeve is the same as the diameter of the round rod part of the screw tap handle.

Further, the outer diameter of the sleeve is the same size as the inner diameter of the threaded bottom hole of the workpiece.

Furthermore, the limiting ring is contacted with the outer wall of the workpiece when the sleeve is inserted into the threaded bottom hole of the workpiece.

Furthermore, the position of the back angle is ground to form a reverse back angle, the cutting resistance is reduced, the grinding length of the back angle is 10 +/-1 mm, the screw pitch of the tapping is not changed, and the size of the spiral angle of the back angle is 0.95 times that of the spiral angle of the cutting edge

Furthermore, the screw tap handle is connected with an external driving assembly.

A tapping method of a tapping assembly comprises the following specific steps:

firstly, grinding the left end of a cutting edge to form a rear angle;

step two, inserting the sleeve into the threaded bottom hole of the workpiece, and enabling the limiting ring to be in good contact with the outer wall of the workpiece;

inserting the sleeve into a threaded bottom hole of a workpiece to determine the center of a screw tap, enabling the screw tap handle to penetrate through the limiting ring to drive the screw tap handle to rotate, enabling the screw tap handle to drive the cutter blade to rotate, enabling the cutter blade to drive the relief angle to be in contact with the workpiece to tap, and enabling a thread groove to be pre-opened after tapping is finished;

and fourthly, continuing to pre-open thread grooves at other parts of the workpiece, aligning the cutting edge to the pre-opened thread grooves after the pre-opening of the thread grooves is completely finished, rotating the cutting edge through the tapping handle, reaming the pre-opened thread grooves by the cutting edge, tapping the part of the threaded bottom hole which is not tapped by the cutting edge, and finishing tapping after the tapping of the cutting edge is finished.

Furthermore, the preset depth of the thread groove is 8-10 mm.

The invention has the beneficial effects that:

according to the invention, the sleeve is inserted into the threaded bottom hole, the center of the tap is accurately positioned, the back angle is quickly and positively raised, the tapping is not limited to the specific structure of the tapping outer surface, then the back angle performs thread groove pre-opening on the threaded bottom hole, and finally the cutting edge performs continuous tapping on the thread groove pre-opened by the thread groove, so that small-batch workpieces or large-scale workpieces can be quickly and manually tapped, the primary tapping qualification rate is ensured to be more than 99%, the instability of manual tapping is solved, and the requirement on the technical level of an operator is low.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic structural view of a tapping assembly of the present invention;

FIG. 2 is a schematic view of the screw tap shank of the present invention and its connection structure;

FIG. 3 is a diagram of a workpiece according to the present invention;

FIG. 4 is a threading assembly of the present invention;

FIG. 5 is an exploded schematic view of the present invention;

in the drawings, the components represented by the respective reference numerals are listed below:

1. the tapping handle 2, the limiting ring 3, the sleeve 4, the rear angle 5 and the cutting edge.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The present invention will be further described with reference to the following examples.

Example 1

As shown in fig. 1 and 2, a tapping assembly comprises a tapping handle 1, the tapping handle 1 is connected with an external driving assembly, the external driving assembly is a drilling machine or a wrench matched with the tapping handle 1, a cutting edge 5 is uniformly and fixedly connected to the right side wall of the tapping handle 1, a back angle 4 is formed at the left end of the cutting edge 5, a reverse back angle is formed at the position of the back angle 4 in a repairing and grinding mode, the cutting resistance is reduced, the grinding length of the back angle is 10 +/-1 mm, the size of a spiral angle of the back angle 4 is 0.95 times of that of the spiral angle of the cutting edge 5, the back angle 4 is used for guiding and righting threads, the cutting edge 5 is used for tapping the threads after being righted, a sleeve 3 is slidably connected to the outer wall of the tapping handle 1, a limiting ring 2 is connected to the left end of the sleeve 3, the inner diameter of the sleeve 3 is the same as that of a round rod of the tapping handle 1, the outer diameter of the sleeve 3 is the same as that of the threaded bottom hole of a workpiece, the sleeve 3 is inserted into the threaded hole of the workpiece, and the limiting ring 2 is in contact with the outer wall of the workpiece, through inserting sleeve 3 in the screw thread bottom hole, with tap center pinpoint, play tooth with relief angle 4 fast and right, be not limited to the concrete structure of tapping surface, then relief angle 4 carries out the thread groove to the screw thread bottom hole and sets up in advance, and the thread groove that cutting edge 5 set up in advance to the thread groove at last continues the tapping, can carry out quick manual tapping to small batch volume work piece or large-scale work piece, guarantee that the qualification rate of tapping is more than 99%, with the instability of solving manual tapping, require lowerly to operator technical merit.

Example 2

Example 2 is a further modification to example 1.

The tapping method for the tapping assembly shown in fig. 3, 4 and 5 comprises the following specific steps:

firstly, grinding the left end of a cutter blade 5 to form a rear angle 4;

step two, inserting the sleeve 3 into the threaded bottom hole of the workpiece, and enabling the limiting ring 2 to be in good contact with the outer wall of the workpiece;

inserting the sleeve 3 into a threaded bottom hole of a workpiece to determine the center of a screw tap, enabling the screw tap handle 1 to penetrate through the limiting ring 2 to drive the screw tap handle 1 to rotate, enabling the screw tap handle 1 to drive the cutting edge 5 to rotate, enabling the cutting edge 5 to drive the back angle 4 to be in contact with the workpiece to tap, and realizing the pre-opening of a thread groove after tapping is finished, wherein the pre-opening depth of the thread groove is 8-10 mm;

and fourthly, continuing to pre-open thread grooves at other parts of the workpiece, aligning the cutting edge 5 with the pre-opened thread grooves after the pre-opening of the thread grooves is completely finished, rotating the cutting edge 5 through the tapping handle 1, reaming the pre-opened thread grooves by the cutting edge 5, tapping the part of the threaded bottom hole which is not tapped by the cutting edge 5, finishing tapping after the tapping of the cutting edge 5 is finished, and performing quick manual tapping on small-batch workpieces or large-size workpieces to ensure that the qualification rate of primary tapping is more than 99 percent so as to solve the instability of manual tapping and have lower requirements on the technical level of an operator.

In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise forms disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A tapping assembly comprising a tap shank (1), characterized in that: the uniform fixedly connected with cutting edge (5) of the right side wall of screw tap handle (1), relief angle (4) have been seted up to the left end of cutting edge (5), the outer wall sliding connection of screw tap handle (1) has sleeve (3), the left end of sleeve (3) is connected with spacing ring (2).

2. The tapping assembly of claim 1 wherein: the inner diameter of the sleeve (3) is the same as the diameter of the round rod part of the screw tap handle (1).

3. The tapping assembly of claim 2 wherein: the outer diameter of the sleeve (3) is the same as the inner diameter of the threaded bottom hole of the workpiece.

4. The tapping assembly of claim 2 wherein: when the sleeve is inserted into the threaded bottom hole of the workpiece, the limiting ring is contacted with the outer wall of the workpiece.

5. The tapping assembly of claim 3 wherein: the part of back angle (4) is repaired and ground into reverse back angle, reduces cutting resistance, and back angle coping length is 10 +/-1 mm, does not change tapping pitch, the helix angle size of back angle (4) is 0.95 times of the helix angle size of cutting edge (5).

6. The tapping assembly of any one of claims 1 to 5 wherein: the tapping handle (1) is connected with an external driving assembly.

7. A tapping method for a tapping assembly according to claim 5, wherein: the method comprises the following specific steps:

firstly, grinding the left end of a cutter blade (5) into a rear angle (4);

step two, inserting the sleeve (3) into the threaded bottom hole of the workpiece, and enabling the limiting ring (2) to be in good contact with the outer wall of the workpiece;

inserting the sleeve (3) into a threaded bottom hole of a workpiece to determine the center of a screw tap, enabling the screw tap handle (1) to penetrate through the limiting ring (2) to drive the screw tap handle (1) to rotate, enabling the screw tap handle (1) to drive the cutting edge (5) to rotate, enabling the cutting edge (5) to drive the relief angle (4) to contact with the workpiece for tapping, and enabling a threaded groove to be pre-formed after tapping is finished;

and fourthly, continuing to pre-open thread grooves at other parts of the workpiece, aligning the cutting edge (5) to the pre-opened thread grooves after the pre-opening of the thread grooves is completely finished, rotating the cutting edge (5) through the tapping handle (1), reaming the pre-opened thread grooves by the cutting edge (5), tapping the non-tapped part of the threaded bottom hole by the cutting edge (5), and finishing tapping after the tapping of the cutting edge (5).

8. The tapping method according to claim 6, wherein: the preset depth of the thread groove is 8-10 mm.