CN113020929B - Screw tap and processing method thereof - Google Patents
Screw tap and processing method thereof Download PDFInfo
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- CN113020929B CN113020929B CN202110315182.1A CN202110315182A CN113020929B CN 113020929 B CN113020929 B CN 113020929B CN 202110315182 A CN202110315182 A CN 202110315182A CN 113020929 B CN113020929 B CN 113020929B
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- tap
- tooth
- cylinder
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- face
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
- B23P15/28—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass cutting tools
- B23P15/48—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass cutting tools threading tools
- B23P15/52—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass cutting tools threading tools taps
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23G—THREAD CUTTING; WORKING OF SCREWS, BOLT HEADS, OR NUTS, IN CONJUNCTION THEREWITH
- B23G5/00—Thread-cutting tools; Die-heads
- B23G5/02—Thread-cutting tools; Die-heads without means for adjustment
- B23G5/06—Taps
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
Abstract
The invention relates to a screw tap and a processing method thereof, wherein after rough turning is carried out on a blank, an obtained screw tap intermediate piece comprises a tooth part, a neck part and a handle part, the two opposite ends of the neck part are respectively connected with the tooth part and the handle part, a first pointed end is reserved on the front end surface of the tooth part, a boss is reserved on the tail end surface of the handle part, the boss comprises a cylinder and a second pointed end, the cylinder is arranged on the tail end surface of the handle part, the diameter of the cylinder is smaller than that of the tail end surface of the handle part, the second pointed end is positioned at one end of the cylinder far away from the handle part, and the first pointed end and the second pointed end are subjected to fine grinding treatment to improve the positioning precision, and then the boss is removed, so that the cylinder and the second pointed end are removed from the tail end surface of the handle part. Because the distance from the tail end face of the neck to the front end face of the tooth part is always fixed and does not change in the process from rough turning to fine grinding, the tolerance of the total length of the tap can be effectively controlled when the tap is machined by the machining process.
Description
Technical Field
The invention relates to the technical field of screw taps, in particular to a screw tap and a processing method thereof.
Background
The tap is a tool for processing internal threads, and is the most popular processing tool used by manufacturers in tapping. For taps without a central hole and a tip in the final structure, the general machining process is to make a tip at the rear end of the shank during rough turning and then remove the tip after heat treatment. However, in the machining process, because no positioning reference is provided, the allowance in sharpening is different from that in removing sharpening, so that the tolerance of the total length of the tap is difficult to control and stabilize.
Disclosure of Invention
In view of the above, it is necessary to provide a tap manufacturing method and a tap that can effectively control the tolerance of the overall length of the tap.
A machining process method of a screw tap comprises the following steps:
providing a blank;
roughly turning the blank to obtain a screw tap intermediate piece, wherein the screw tap intermediate piece comprises a tooth part, a neck part and a handle part, the two opposite ends of the neck part are respectively connected with the tooth part and the handle part, a first pointed end is reserved on the front end face of the tooth part, a boss is reserved on the tail end face of the handle part, the boss comprises a cylinder and a second pointed end, the cylinder is arranged on the tail end face of the handle part, the diameter of the cylinder is smaller than that of the tail end face of the handle part, and the second pointed end is positioned at one end, far away from the handle part, of the cylinder;
carrying out fine grinding treatment on the first cusp and the second cusp;
the boss is removed such that both the cylinder and the second prong are removed from the trailing face of the shank.
In one embodiment, the step of rough turning the blank to obtain the tap intermediate further comprises:
and carrying out heat treatment on the tap intermediate part.
In one embodiment, the step of removing the boss further comprises:
the tail end of the handle part is subjected to square grinding treatment;
grinding the outer circles of the front ends of the tooth part, the neck part and the handle part;
cutting a tooth part chip groove;
and machining threads on the tooth parts.
In one embodiment, the flutes are parallel flutes parallel to the tap axis; or
The chip groove is a spiral groove.
In one embodiment, the step of machining the thread on the tooth further comprises:
the peripheral side of the front end of the tooth part is subjected to tip shoveling treatment.
In one embodiment, after the step of performing the tip shoveling process on the front circumference of the tooth part, the method further comprises:
the first prong is removed.
In one embodiment, the step of machining the thread on the tooth further comprises:
and passivating the tooth part.
In one embodiment, the step of machining the thread on the tooth further comprises:
the outer side of the tooth is coated.
The processing method of the screw tap at least has the following advantages:
after carrying out rough turning to the blank, the screw tap middleware that obtains includes tooth portion, neck and stalk portion, the relative both ends of neck are connected with tooth portion and stalk portion respectively, the preceding terminal surface reservation of tooth portion has first tip, the tail end face reservation of stalk portion has the boss, the boss includes cylinder and second tip, the cylinder sets up on the tail end face of stalk portion and the cylindrical diameter is less than the diameter of the tail end face of stalk portion, the second tip is located that end that the stalk portion was kept away from to the cylinder, carry out the correct grinding to first tip and second tip and handle, with the precision that improves the location, then get rid of the boss, make cylinder and second tip all get rid of from the tail end face of stalk portion. Because the distance from the tail end face of the neck to the front end face of the tooth part is always fixed and does not change in the process from rough turning to fine grinding, the tolerance of the total length of the tap can be effectively controlled when the tap is machined by the machining process.
The tap is manufactured by the processing method of any one of the taps.
Drawings
FIG. 1 is a schematic flow diagram of a process for manufacturing a tap according to one embodiment;
FIG. 2 is a schematic view of an intermediate piece of the tap according to an embodiment.
In the figure, 10, a tap intermediate part; 100. a tooth portion; 200. a neck portion; 300. a handle; 110. a front end face; 400. a first prong; 310. a tail end surface; 500. a boss; 510. a cylinder; 520. a second prong.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments accompanying figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather should be construed as broadly as the present invention is capable of modification in various respects, all without departing from the spirit and scope of the present invention.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
It should be understood that the terms "first", "second", etc. are used herein to describe various information, but the information should not be limited to these terms, which are only used to distinguish one type of information from another. For example, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information, without departing from the scope of the present invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. All possible combinations of the technical features of the above embodiments may not be described for the sake of brevity, but should be considered as within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features.
It should be noted that, the terms "front end" and "back end" as used herein refer to: the proximal machining end is the "front end" and the distal machining end is the "rear end" during machining, which are relative concepts and can therefore vary depending on the different positions in which they are located and the different conditions of use. These and other orientations, therefore, should not be used in a limiting sense.
Referring to fig. 1 and 2, a manufacturing method of a tap according to an embodiment includes the following steps:
step S100, a blank is provided. For example, the blank may be cylindrical, or elongated.
And step S200, roughly turning the blank to obtain the screw tap intermediate 10. Referring also to fig. 2, the tap intermediate 10 includes a tooth 100, a neck 200 and a shank 300, and opposite ends of the neck 200 are connected to the tooth 100 and the shank 300, respectively. Specifically, the diameter of neck 200 is smaller than the diameter of tooth 100 and the diameter of handle 300. The front end surface 110 of the tooth part 100 is reserved with a first cusp 400, and the first cusp 400 is used for positioning. The tail end face 310 of the handle 300 is reserved with a boss 500, the boss 500 comprises a cylinder 510 and a second pointed end 520, the cylinder 510 is arranged on the tail end face 310 of the handle 300, the diameter of the cylinder 510 is smaller than that of the tail end face 310 of the handle 300, the second pointed end 520 is arranged at one end of the cylinder 510 far away from the handle 300, and the second pointed end 520 is used for positioning. That is, the distance L between the trailing face 310 of the handle 300 and the leading face 110 of the tooth 100 does not change with the removal of the second prong 520.
Step S300, heat-treating the tap intermediate 10. The purpose of heat-treating the tap intermediate 10 is to reinforce the hardness of the tap intermediate 10 so that the hardness of the resulting tap product is also reinforced.
The first and second nibs 400 and 520 are subjected to a finish grinding process at step S400. The first nib 400 and the second nib 520 are finely ground, mainly to ensure the run-out of the first nib 400 and the second nib 520, thereby improving the positioning accuracy and the machining accuracy.
In step S610, a butt end of the shank 300 is ground. First, when the tap is mounted on the main shaft through the handle, the tap is mounted on the handle mainly through the tail end of the handle 300, so that the tail end of the handle 300 needs to be ground to be square, and the tap is prevented from moving relative to the handle after being mounted on the handle. Second, the rear end of the shank 300 is ground to increase the torque force during the tap forming process.
In step S620, the outer circumference of the front ends of the tooth part 100, the neck part 200 and the handle part 300 is ground. After rough turning, the obtained tap intermediate 10 is a semi-finished product with allowance, so that the tooth part 100 needs to be ground to remove the allowance of the tooth part 100; grinding the outer circle of the neck part 200, and removing the allowance of the neck part 200; the outer circumference of the front end of the shank 300 is ground to remove the margin of the front end of the shank 300.
In step S630, a chip groove is opened in the tooth 100. The chip removal groove is mainly used for removing chips in the machining process of the screw tap. The chip removal groove can be a parallel groove parallel to the axis of the screw tap, and can also be a spiral groove, and the chip removal groove can be designed according to actual requirements. The flutes may extend from the tooth 100 to the neck 200.
In step S640, a thread is formed on the tooth 100. Specifically, threads may be milled into the teeth 100.
In step S650, a tip cutting process is performed on the periphery of the tip of the tooth portion 100. The shovel tip is only carried out aiming at the front end of the tooth part 100, and the shovel tip which is processed and shoveled out by the shovel tip can guide the screw tap to enter a hole of a workpiece to carry out hole machining.
Step S500, boss 500 is removed such that cylinder 510 and second prong 520 are both removed from the trailing face 310 of shank 300. Specifically, the second prong 520 may be removed by holding the handle 300 with a pronating device, the pronating location being just proximal to the trailing face 310 of the handle 300.
Since the distance from the end surface 310 of the neck portion 200 to the end surface 110 of the tooth portion 100 is constant and does not change from rough turning to finish turning, the tolerance of the overall length of the tap can be effectively controlled when the tap is manufactured by the above-described manufacturing method.
Step S660, the first cusp 400 is removed. This step is performed only for taps that need to be removed from the first tip 400, and the taps after the removal of the first tip 400 are mainly used for machining non-through holes, so as to prevent the first tip 400 from interfering with the bottom of the non-through hole. In other embodiments, when the tap is used to process the through hole, the step S660 may be omitted, in which the tap retains the first nib 400.
In step S670, the tooth 100 is passivated. The passivation is applied to the teeth 100, and the passivated teeth 100 can increase the service life of the finished tap.
In step S680, a coating process is performed on the outer side of the tooth 100. The coating is directed to the teeth 100, the coating is applied to the teeth 100 after the threads are milled, and the coating is applied to the outer side of the threads to improve the service life of the tap.
The invention also provides a screw tap which is manufactured by the processing method of the screw tap.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that various changes and modifications can be made by those skilled in the art without departing from the spirit of the invention, and these changes and modifications are all within the scope of the invention. Therefore, the protection scope of the present patent should be subject to the appended claims.
Claims (9)
1. The machining process method of the screw tap is characterized by comprising the following steps of:
providing a blank;
roughly turning the blank to obtain a screw tap intermediate piece, wherein the screw tap intermediate piece comprises a tooth part, a neck part and a handle part, the two opposite ends of the neck part are respectively connected with the tooth part and the handle part, a first pointed end is reserved on the front end face of the tooth part, a boss is reserved on the tail end face of the handle part, the boss comprises a cylinder and a second pointed end, the cylinder is arranged on the tail end face of the handle part, the diameter of the cylinder is smaller than that of the tail end face of the handle part, and the second pointed end is positioned at one end, far away from the handle part, of the cylinder;
carrying out fine grinding treatment on the first cusp and the second cusp;
the boss is removed such that both the cylinder and the second prong are removed from the trailing face of the shank.
2. The method for machining a tap according to claim 1, wherein the step of rough turning the blank to obtain the tap intermediate member further comprises:
and carrying out heat treatment on the tap intermediate part.
3. The method for forming a tap according to claim 1, wherein the step of removing the boss further comprises:
the tail end of the handle part is subjected to square grinding treatment;
grinding the outer circles of the front ends of the tooth part, the neck part and the handle part;
cutting a tooth part chip groove;
and machining threads on the tooth parts.
4. The method for manufacturing a tap according to claim 3, wherein the chip flutes are parallel flutes parallel to the tap axis; or
The chip groove is a spiral groove.
5. The method for forming a tap according to claim 3, wherein the step of forming the thread on the thread portion further comprises:
the peripheral side of the front end of the tooth part is subjected to tip shoveling treatment.
6. The method for manufacturing a tap according to claim 3, wherein after the step of performing a tip relief treatment on the circumferential side of the tip of the tooth, the method further comprises:
the first prong is removed.
7. The method for forming a tap according to claim 3, wherein the step of forming the thread on the thread portion further comprises:
and passivating the tooth part.
8. The method for forming a tap according to claim 3, wherein the step of forming the thread on the thread portion further comprises:
the outer side of the tooth is coated.
9. A tap, characterized in that it is manufactured by the method of manufacturing a tap according to any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110315182.1A CN113020929B (en) | 2021-03-24 | 2021-03-24 | Screw tap and processing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110315182.1A CN113020929B (en) | 2021-03-24 | 2021-03-24 | Screw tap and processing method thereof |
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| CN113020929A CN113020929A (en) | 2021-06-25 |
| CN113020929B true CN113020929B (en) | 2022-06-21 |
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| CN114083363B (en) * | 2021-11-29 | 2023-03-24 | 河北力准机械制造有限公司 | Screw tap processing machine tool |
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| KR101360720B1 (en) * | 2007-06-08 | 2014-02-07 | 오에스지 가부시키가이샤 | Tap covered with hard coating, and process for manufacturing the same |
| CN101712089B (en) * | 2009-11-18 | 2012-04-18 | 西安工业大学 | Spiral fluted tap and method for processing same |
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| CN102049661A (en) * | 2009-11-05 | 2011-05-11 | 陆铭 | Processing technology of drive axle body of tractor |
| CN202846359U (en) * | 2012-10-17 | 2013-04-03 | 重庆市星极齿轮有限责任公司 | Taper grinding clamp used for shaft |
| CN211760073U (en) * | 2019-12-31 | 2020-10-27 | 奥特凯姆（中国）汽车部件有限公司 | CNC lathe processing part overall length controlling means |
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