CN217799447U - Special screw tap for large-pitch large-diameter internal thread machining - Google Patents
Special screw tap for large-pitch large-diameter internal thread machining Download PDFInfo
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- CN217799447U CN217799447U CN202221409423.5U CN202221409423U CN217799447U CN 217799447 U CN217799447 U CN 217799447U CN 202221409423 U CN202221409423 U CN 202221409423U CN 217799447 U CN217799447 U CN 217799447U
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Abstract
The utility model relates to a big pitch major diameter internal thread machining special screw tap, including screw tap handle and the cutting taper pole that each other is as an organic whole or fixed connection, the free end of cutting taper pole is equipped with the cutting conical head, and its innovation point lies in: the outer wall of the cutting cone head is provided with a first thread section and a second thread section which are arranged in a stepped structure, the first thread section and the second thread section are connected through a margin transition section, the thread small diameter phi A1 of the first thread section is smaller than the thread small diameter phi B1 of the second thread section, the thread middle diameter phi A2 of the first thread section is smaller than the thread middle diameter phi B2 of the second thread section, the thread large diameter phi A3 of the first thread section is smaller than the thread large diameter phi B3 of the second thread section, and the thread pitch P1 of the first thread section is equal to the thread pitch P2 of the second thread section. The utility model discloses utilize current miniwatt lathe to realize major diameter or coarse pitch screw thread machine tooling, and can guarantee processingquality again.
Description
Technical Field
The utility model relates to a special screw tap, concretely relates to special screw tap of big pitch major diameter internal thread machining.
Background
In the existing method for processing the threaded hole, tapping and thread milling are common methods for processing threads, but tapping is mainly used for processing threads (with the aperture below 26 mm) of a small hole, and common tap processing is used for threads (with the aperture above 30 mm) with large diameter or large thread pitch, so that a high-power machine tool drive needs to be additionally configured, even if the machine tool power can meet the requirement, a workpiece is easy to deform, and the danger of breakage can occur due to overlarge stress, so that the existing thread processing with large diameter generally adopts a thread milling mode, but the thread milling cutting speed is slow, and the defect of long processing time exists. Therefore, it is necessary to design a method for machining a large-pitch thread with a large diameter by using an existing low-power machine tool to reduce the production cost.
Disclosure of Invention
The utility model aims at: the special screw tap for large-pitch and large-diameter internal thread machining is capable of realizing large-diameter or large-pitch thread machining by using the existing low-power machine tool and guaranteeing the machining quality.
In order to achieve the above purpose, the technical scheme of the utility model is that: the utility model provides a big pitch major diameter internal thread machine tooling special screw tap, includes screw tap handle and the cutting awl pole that each other is integrative or fixed connection, the free end of cutting awl pole is equipped with the cutting awl head, and its innovation point lies in:
the outer wall of the cutting cone head is provided with a first thread section and a second thread section which are arranged in a step-shaped structure, the first thread section is connected with the second thread section through a margin transition section,
the thread small diameter phi A1 of the first thread section is smaller than the thread small diameter phi B1 of the second thread section, the thread middle diameter phi A2 of the first thread section is smaller than the thread middle diameter phi B2 of the second thread section, the thread large diameter phi A3 of the first thread section is smaller than the thread large diameter phi B3 of the second thread section, and the thread pitch P1 of the first thread section is equal to the thread pitch P2 of the second thread section.
In the technical scheme, the radius difference between the small thread diameter Φ A1 of the first thread section and the small thread diameter Φ B1 of the second thread section is 0.25 ± 0.02mm, the radius difference between the middle thread diameter Φ A2 of the first thread section and the middle thread diameter Φ B2 of the second thread section is 0.25 ± 0.02mm, and the radius difference between the large thread diameter Φ A3 of the first thread section and the large thread diameter Φ B3 of the second thread section is 0.25 ± 0.02mm.
In the above technical solution, the thread pitch P1 of the first thread section and the thread pitch P2 of the second thread section are both 1.5 ± 0.008mm.
In the above technical solution, the allowance transition section is an annular groove.
In the above technical scheme, the end of the cutting cone head and the outer side of the first thread section are provided with a first guide section, and the cutting cone head is provided with a second guide section which is located on the outer side of the second thread section and close to the allowance transition section.
In the above technical solution, the length L1 of the first thread segment is equal to the length L2 of the second thread segment, and both the lengths are 12 ± 0.5mm.
In the above technical scheme, the free end of the cutting conical rod is provided with a plurality of axially arranged cutting conical heads along the circumferential direction, and axial chip removal grooves are formed in the cutting conical rod and located between adjacent cutting conical heads.
The utility model discloses the positive effect who has is: after the special screw tap is machined by the large-pitch large-diameter inner thread of the utility model, because the outer wall of the cutting cone head of the utility model is provided with the first thread section and the second thread section which are arranged in a step structure, and the first thread section and the second thread section are connected through the allowance transition section,
the thread small diameter phi A1 of the first thread section is smaller than the thread small diameter phi B1 of the second thread section, the thread middle diameter phi A2 of the first thread section is smaller than the thread middle diameter phi B2 of the second thread section, the thread large diameter phi A3 of the first thread section is smaller than the thread large diameter phi B3 of the second thread section, the thread pitch P1 of the first thread section is equal to the thread pitch P2 of the second thread section,
during the use, will the screw tap handle is attacked on the central main shaft by the brill of lathe by the centre gripping, and work piece (magneto electric cover) is fixed on the workstation of lathe, brill is attacked central main shaft and is driven screw tap handle axial feed motion (1 pitch/per turn), first screw thread section cuts the work piece hole earlier, treats first screw thread section and accomplishes the cutting back, brill is attacked central main shaft and is continued to drive screw tap handle axial feed motion, through the surplus changeover portion, again by the second screw thread section lasts and cuts the work piece hole, finally accomplishes the processing of work piece screw thread hole, because the well footpath of first screw thread section, the major diameter all compare well footpath, the major diameter that the second screw thread section corresponds little, but first screw thread section and second screw thread section have the same pitch, and the screw thread is through the successive processing of first screw thread section and second screw thread section, and every step processing surplus is little, and the cutting force is little, and the screw tap is difficult to break, need not high-power machine tool drive, just can accomplish big screw pitch or major diameter thread processing through low power, has not only improved the machining time, can guarantee the processingquality moreover to and have strong suitability advantage such as the suitability.
Drawings
FIG. 1 is a schematic structural view of an embodiment of the present invention;
FIG. 2 is a left side schematic view of the structure of FIG. 1;
FIG. 3 is a schematic view of a first state of the present invention in use;
FIG. 4 is a schematic view of a second state of the present invention in use;
fig. 5 is a schematic view of a third state of the present invention in use.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and examples, but is not limited thereto.
As shown in fig. 1, 2, 3, 4 and 5, the special tap for large-pitch large-diameter internal thread machining comprises a tap handle 1 and a cutting conical rod 2 which are integrated or fixedly connected with each other, wherein a cutting conical head 21 is arranged at the free end of the cutting conical rod 2,
the outer wall of the cutting cone head 21 is provided with a first thread section 211 and a second thread section 212 which are arranged in a stepped structure, the first thread section 211 and the second thread section 212 are connected through a margin transition section 213,
the thread small diameter phi A1 of the first thread section 211 is smaller than the thread small diameter phi B1 of the second thread section 212, the thread middle diameter phi A2 of the first thread section 211 is smaller than the thread middle diameter phi B2 of the second thread section 212, the thread large diameter phi A3 of the first thread section 211 is smaller than the thread large diameter phi B3 of the second thread section 212, and the thread pitch P1 of the first thread section 211 is equal to the thread pitch P2 of the second thread section 212.
As shown in fig. 1, in order to ensure the machining allowance per step and reduce the cutting force, the radius difference between the small thread diameter Φ A1 of the first thread section 211 and the small thread diameter Φ B1 of the second thread section 212 is 0.25 ± 0.02mm, the radius difference between the middle thread diameter Φ A2 of the first thread section 211 and the middle thread diameter Φ B2 of the second thread section 212 is 0.25 ± 0.02mm, and the radius difference between the large thread diameter Φ A3 of the first thread section 211 and the large thread diameter Φ B3 of the second thread section 212 is 0.25 ± 0.02mm.
As shown in fig. 1, the pitch P1 of the first thread segments 211 and the pitch P2 of the second thread segments 212 are both 1.5 ± 0.008mm. The design aims to reduce tapping cutting force through uniform distribution of axial allowance and stepped distribution of radial allowance in tapping.
As shown in fig. 1, the allowance transition section 213 is an annular groove. This is designed so that the second thread segments 212 participate in the cutting action only after the cutting of the first thread segments 211 is completed.
As shown in fig. 1, in order to provide a guiding function during the machining of the workpiece, a first guiding section 214 is provided at the end of the cutting bit 21 and outside the first thread section 211, and a second guiding section 215 is provided on the cutting bit 21 and outside the second thread section 212 and near the allowance transition section 213.
As shown in fig. 1, in order to further improve the rationality of the present invention, the length L1 of the first thread segments 211 and the length L2 of the second thread segments 212 are equal, and both are 12 ± 0.5mm.
As shown in fig. 2, in order to make the structure more reasonable and facilitate discharging the cutting chips generated during the cutting process of the workpiece, the free end of the cutting cone rod 2 is provided with a plurality of axially arranged cutting cone heads 21 along the circumferential direction thereof, and axial chip discharge grooves 216 are formed on the cutting cone rod 2 and between adjacent cutting cone heads 21.
When the utility model is used, taking the processing of the screw hole of the magneto cover as an example, the screw tap handle 1 is clamped on the drilling and tapping central spindle 3 of a low-power machine tool, the magneto cover 4 is fixed on the machine tool workbench,
as shown in fig. 3, the central spindle 3 of the drilling tap drives the tap handle 1 to axially feed towards the magneto cover 4 (1 pitch/rotation),
as shown in fig. 4, the first thread section 211 of the cutting taper rod 2 enters the inner hole of the magneto cover 4, the drilling and tapping central spindle 3 drives the cutting taper rod 2 to rotate through the tap handle 1, under the guiding action of the first guiding section 214, the inner hole of the magneto cover 4 is firstly cut by the first thread section 211,
as shown in fig. 5, after the first thread section 211 is cut, the drilling and tapping central spindle 3 continues to drive the tap handle 1 to perform axial feed motion, passes through the allowance transition section 213, and then the second thread section 212 continues to cut the inner hole of the magneto cover 4 under the guiding action of the second guiding section 215, thereby finally finishing the processing of the inner hole of the magneto cover 4.
Because the pitch diameter of first screw thread section, the pitch diameter that the second screw thread section corresponds is all compared to major diameter, the major diameter is little in the major diameter, but first screw thread section and second screw thread section have the same pitch, the screw thread is through the successive processing of first screw thread section and second screw thread section, every worker's step allowance is little, the cutting force is little, the difficult rupture of screw tap, need not high-power machine tool drive, can accomplish large-pitch or major diameter thread processing through the miniwatt lathe, machining efficiency has not only been improved, the process time has been shortened, and the suitability is strong, etc.
Therefore, the utility model discloses a special screw tap can satisfy and realize the screw processing of aperture more than 30mm on the low-power lathe, need not to be equipped with high-power lathe, has not only reduced manufacturing cost, and coarse pitch or major diameter adopt the tapping mode to process moreover, have improved machining efficiency, shorten process time to and can guarantee processingquality again.
In light of the foregoing, it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (7)
1. The utility model provides a special screw tap of big pitch major diameter internal thread machining, includes screw tap handle (1) and cutting awl pole (2) that each other is integrative or fixed connection, the free end of cutting awl pole (2) is equipped with cutting conical head (21), its characterized in that:
the outer wall of the cutting cone head (21) is provided with a first thread section (211) and a second thread section (212) which are arranged in a stepped structure, the first thread section (211) and the second thread section (212) are connected through a margin transition section (213),
the thread small diameter phi A1 of the first thread section (211) is smaller than the thread small diameter phi B1 of the second thread section (212), the thread middle diameter phi A2 of the first thread section (211) is smaller than the thread middle diameter phi B2 of the second thread section (212), the thread large diameter phi A3 of the first thread section (211) is smaller than the thread large diameter phi B3 of the second thread section (212), and the thread pitch P1 of the first thread section (211) is equal to the thread pitch P2 of the second thread section (212).
2. The large-pitch large-diameter internal thread machining special tap according to claim 1, wherein: the radius difference between the small thread diameter phi A1 of the first thread section (211) and the small thread diameter phi B1 of the second thread section (212) is 0.25 +/-0.02 mm, the radius difference between the middle thread diameter phi A2 of the first thread section (211) and the middle thread diameter phi B2 of the second thread section (212) is 0.25 +/-0.02 mm, and the radius difference between the large thread diameter phi A3 of the first thread section (211) and the large thread diameter phi B3 of the second thread section (212) is 0.25 +/-0.02 mm.
3. The large-pitch large-diameter internal thread machining special tap according to claim 1, wherein: the thread pitch P1 of the first thread section (211) and the thread pitch P2 of the second thread section (212) are both 1.5 +/-0.008 mm.
4. The large-pitch large-diameter internal thread machining special tap according to claim 1, wherein: the allowance transition section (213) is an annular groove.
5. The large-pitch large-diameter internal thread machining special tap according to claim 1, wherein: the end part of the cutting cone head (21) is provided with a first guide section (214) on the outer side of the first thread section (211), and a second guide section (215) is arranged on the cutting cone head (21) on the outer side of the second thread section (212) and close to the allowance transition section (213).
6. The large-pitch large-diameter internal thread machining special tap according to claim 1, wherein: the length L1 of the first thread section (211) is equal to the length L2 of the second thread section (212), and both the lengths are 12 +/-0.5 mm.
7. The large-pitch large-diameter internal thread machining special tap according to claim 1, wherein: the free end of cutting awl pole (2) is equipped with a plurality of cutting awl heads (21) of axial arrangement along its circumferencial direction, and is equipped with axial chip groove (216) on cutting awl pole (2) and lie in between adjacent cutting awl head (21).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221409423.5U CN217799447U (en) | 2022-06-07 | 2022-06-07 | Special screw tap for large-pitch large-diameter internal thread machining |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221409423.5U CN217799447U (en) | 2022-06-07 | 2022-06-07 | Special screw tap for large-pitch large-diameter internal thread machining |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217799447U true CN217799447U (en) | 2022-11-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221409423.5U Active CN217799447U (en) | 2022-06-07 | 2022-06-07 | Special screw tap for large-pitch large-diameter internal thread machining |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217799447U (en) |
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2022
- 2022-06-07 CN CN202221409423.5U patent/CN217799447U/en active Active
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