CN114770043A - Method for processing coaxial small hole of circuit framework contact pin - Google Patents
Method for processing coaxial small hole of circuit framework contact pin Download PDFInfo
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- CN114770043A CN114770043A CN202210456645.0A CN202210456645A CN114770043A CN 114770043 A CN114770043 A CN 114770043A CN 202210456645 A CN202210456645 A CN 202210456645A CN 114770043 A CN114770043 A CN 114770043A
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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
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Abstract
The invention discloses a method for processing coaxial small holes of contact pins of a circuit framework, which comprises the following steps: analyzing the design structure of the coaxial small hole, and selecting an extension rod; customizing a cemented carbide drill with a lengthened through hole phi of 5.3mm, a step drill, a sealing hole sizing milling reamer and a reamer with a chamfer phi of 9.5 mm; adopting a hard alloy drill with the diameter of 5.3mm to pre-drill a mounting hole; drilling a sealing hole and a threaded hole by using hard alloy with the diameter of phi 5.3mm, and reaming the mounting hole to the diameter of phi 9.3 mm; drilling the threaded hole through a hard alloy drill with the diameter of 5.3 mm; reaming the threaded hole to be phi 5.5mm by adopting a step drill, and reaming the sealing hole to be phi 7.7 mm; a sealing hole fixed-size milling reamer is adopted to ream a sealing hole with a diameter of 7.9 mm; detecting the coaxiality of the threaded hole and the sealing hole; reaming a mounting hole with the diameter of 9.5mm by using a reamer with the diameter of 9.5mm and chamfering; drawing 1/4-28UNF thread buttons on the threaded holes by using an extended tap; and (5) removing burrs. The processing method for the coaxial small holes of the circuit framework contact pins can solve the problems of low processing efficiency and low product percent of pass of the existing processing method.
Description
Technical Field
The invention relates to the technical field of hole machining, in particular to a method for machining coaxial small holes of contact pins of a circuit framework.
Background
A framework structure for mounting a circuit board and a sensor pin in an oil drilling instrument is shown in figures 1 and 2, and a plurality of coaxial small holes are arranged on the end face and comprise a mounting hole with the diameter of 9.5, a sealing hole with the diameter of 7.92+0.05/+0.02 and a threaded hole with the diameter of 1/4-28 UNF. The aperture of the sealing hole is small, and the requirement on dimensional tolerance is strict; and the distance between the sealing hole and the end face of the workpiece is far, the distance between the center of the sealing hole and the excircle of the workpiece is small, and the requirement on the coaxiality of the sealing hole and the threaded hole is high, so that the coaxial small hole is limited by a cutter in the machining process, the phenomena of hole axis deflection, hole diameter over-tolerance, non-coaxial sealing hole and thread and the like are easy to occur, and the workpiece working procedure machining efficiency and the product percent of pass are low. The material of the circuit framework is imported high-temperature nickel-based alloy 718, and the value is high. However, the 718 material has poor machining performance, which affects the machining efficiency of the coaxial small hole, and causes the product yield of the coaxial small hole to be lower, thereby increasing the machining cost of the coaxial small hole.
Disclosure of Invention
The invention aims to provide a method for processing coaxial small holes of contact pins of a circuit framework, and solves the problems of low processing efficiency and low product percent of pass of the existing processing method.
In order to achieve the purpose, the invention provides a method for processing coaxial small holes of contact pins of a circuit framework, which comprises the following steps:
s1, analyzing the design structure of the coaxial small holes, and selecting a high-strength and interference-free extension rod for clamping the cutter;
s2, designing and customizing a cemented carbide drill with a lengthened through hole phi of 5.3mm, a step drill, a sealed hole sizing milling reamer and a reamer with a chamfer phi of 9.5 mm;
s3, pre-drilling a mounting hole in a pecking drilling mode by adopting a hard alloy drill with the diameter of 5.3 mm; drilling a sealing hole and a threaded hole by using hard alloy with the diameter of 5.3mm, wherein the drilling depth of the threaded hole is greater than the required depth of the thread; reaming the mounting hole to phi 9.3 mm; drilling the threaded hole through a hard alloy drill with the diameter of 5.3 mm; in the machining process of the hard alloy drill with the diameter of 5.3mm, different overhanging lengths are adopted according to the depth of a hole;
s4, reaming the threaded hole to phi 5.5mm by adopting a step drill, and reaming the sealing hole to phi 7.7 mm; then, a sealing hole fixed-size milling reamer is adopted to ream the sealing hole with the diameter of 7.9 mm;
s5, detecting the coaxiality of the threaded hole and the sealing hole; then, repairing the hole until the hole is qualified;
s6, reaming a mounting hole with a diameter phi of 9.5mm by using a reamer with a chamfer angle of 9.5mm, and chamfering; chamfering the threaded hole by using a chamfering tool; an 1/4-28UNF thread buckle on the lengthened screw tap leading screw hole is used for manually tapping to the required depth;
and S7, deburring.
Preferably, in S2, when the mounting hole is pre-drilled, the carbide drill with a diameter of 5.3mm drills a punching chip with a lifting cutter of 1-1.5mm each time.
Preferably, in S5, the coaxiality of the threaded hole and the sealing hole is detected by using a coaxial mandrel, the coaxial mandrel does not pass through the threaded hole, and the threaded hole is repaired by shifting the axis of the threaded hole within a tolerance range until the coaxial mandrel passes through the threaded hole.
Preferably, in S7, a drill with a diameter of 5.5mm is used to remove burrs on the threaded surface after tapping.
The processing method of the coaxial small hole of the circuit framework contact pin has the advantages and positive effects that:
1. firstly, a hard alloy drill with the diameter of 5.3mm is adopted for drilling, and a mounting hole, a sealing hole and a threaded hole are synchronously drilled, so that the coaxiality of the mounting hole, the sealing hole and the threaded hole is favorably improved.
2. And the step drill is adopted to synchronously ream the threaded hole and the sealing hole, so that the coaxiality of the sealing hole and the threaded hole is favorably improved.
3. Under the coordination of a hard alloy drill with the diameter of 5.3mm, a step drill and a sealing hole sizing milling reamer, the sequential processing sequence of the coaxial small holes is combined, so that the installation qualification rate of the coaxial small holes reaches 100 percent.
4. The coaxial small hole prepared by the processing method of the invention ensures the quality of the coaxial small hole, reduces the problems of the over-tolerance of the aperture of the sealing hole and the non-coaxial between the sealing hole and the threaded hole, reduces the repair rate, improves the processing efficiency and reduces the processing cost.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
FIG. 1 is a flow chart of an embodiment of a method for processing coaxial holes of pins of a circuit framework according to the present invention;
FIG. 2 is a schematic diagram of a circuit skeleton structure according to an embodiment of a method for processing coaxial small holes of pins of the circuit skeleton of the present invention;
fig. 3 is a schematic diagram of a cross-sectional structure of a circuit skeleton according to an embodiment of a method for processing coaxial small holes of pins of the circuit skeleton.
Reference numerals
1. A coaxial aperture; 2. mounting holes; 3. sealing the hole; 4. a threaded hole.
Detailed Description
The technical solution of the present invention is further illustrated by the accompanying drawings and examples.
Examples
A processing method of coaxial small holes of circuit framework contact pins comprises the following steps:
s1, analyzing the design structure of the coaxial small hole 1, and selecting a high-strength and interference-free extension rod for clamping the cutter. The diameter of the extension rod is increased as much as possible under the condition of meeting the use requirement so as to reduce the axial deviation rate of the coaxial small hole 1.
S2, designing and customizing a cemented carbide drill with an elongated through hole phi of 5.3mm, a step drill, a sealing hole 3 sizing milling reamer and a reamer with a chamfer phi of 9.5 mm.
S3, pre-drilling the mounting hole 2 by adopting a hard alloy drill with the diameter of 5.3mm in a pecking drilling mode. When the mounting hole 2 is pre-drilled, the hard alloy drill with the diameter of 5.3mm lifts and punches chips every time the hard alloy drill with the diameter of 1-1.5mm is drilled, so that the clamping and breaking of the cutter are avoided. And drilling a sealing hole 3 and a threaded hole 4 by using hard alloy with the diameter of 5.3mm, wherein the drilling depth of the threaded hole 4 is greater than the required depth of the thread. A hard alloy drill with the diameter of 5.3mm is adopted to pre-drill to the bottom in one step, so that the coaxiality of the mounting hole 2, the sealing hole 3 and the threaded hole 4 is improved.
Reaming the mounting hole 2 to phi 9.3 mm; drilling the threaded hole 4 through by using a hard alloy drill with the diameter of 5.3 mm; on the one hand, the drilling through of the threaded hole 4 is facilitated, and on the other hand, the coaxiality of the subsequent threaded hole 4 is improved. In the machining process of the hard alloy drill with the diameter of 5.3mm, different overhanging lengths are adopted according to the depth of the hole.
And S4, reaming the threaded hole 4 to be phi 5.5mm by adopting a step drill, and reaming the sealing hole 3 to be phi 7.7 mm. Adopt the step to bore sealed hole 3 and the synchronous reaming of screw hole 4, be favorable to improving sealed hole 3 and screw hole 4's axiality. And then a milling reamer for sizing the sealing hole 3 is adopted to ream the sealing hole 3 with the diameter of 7.9 mm.
S5, detecting the coaxiality of the threaded hole 4 and the sealing hole 3; and then trimming the hole until the hole is qualified. And (3) detecting the coaxiality of the threaded hole 4 and the sealing hole 3 by using a coaxial core rod, wherein the coaxial core rod does not pass through, and the hole axis is shifted within a tolerance range to repair the hole until the coaxial core rod passes through.
S6, reaming the mounting hole 2 with a reamer with a chamfer angle of 9.5mm and chamfering; chamfering the threaded hole 4 by using a chamfering tool; and an elongated tap is used for guiding 1/4-28UNF threaded buttons on the threaded hole 4, and the tap is manually tapped to the required depth.
And S7, deburring. And (5) inserting and removing burrs on the surface of the tapped thread by adopting a drill bit with the diameter of 5.5 mm.
Therefore, the processing method for the coaxial small holes of the circuit framework contact pins can solve the problems of low processing efficiency and low product percent of pass of the existing processing method.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the disclosed embodiments without departing from the spirit and scope of the present invention.
Claims (4)
1. A processing method of a coaxial small hole of a circuit framework contact pin is characterized by comprising the following steps:
s1, analyzing the design structure of the coaxial small holes, and selecting a high-strength and interference-free extension rod for clamping the cutter;
s2, designing and customizing a cemented carbide drill with a lengthened through hole phi of 5.3mm, a step drill, a sealed hole sizing milling reamer and a reamer with a chamfer phi of 9.5 mm;
s3, pre-drilling a mounting hole in a pecking drilling mode by adopting a hard alloy drill with the diameter of 5.3 mm; drilling a sealing hole and a threaded hole by using hard alloy with the diameter of 5.3mm, wherein the drilling depth of the threaded hole is greater than the required depth of the thread; reaming the mounting hole to phi 9.3 mm; drilling through the threaded hole by using a hard alloy drill with the diameter of 5.3 mm;
s4, reaming the threaded hole to phi 5.5mm by adopting a step drill, and reaming the sealing hole to phi 7.7 mm; then a sealing hole sizing milling reamer is adopted to ream a sealing hole with a diameter of 7.9 mm;
s5, detecting the coaxiality of the threaded hole and the sealing hole; then, repairing the hole until the hole is qualified;
s6, reaming a mounting hole with a diameter of 9.5mm by using a reamer with a chamfer diameter of 9.5mm, and chamfering; chamfering the threaded hole by using a chamfering tool; leading 1/4-28UNF thread buttons on the threaded holes by using an extended tap, and manually tapping to the required depth;
and S7, deburring.
2. The method for processing the coaxial small hole of the circuit framework pin according to claim 1, characterized in that: in S2, when the mounting hole is pre-drilled, the carbide drill with the diameter of 5.3mm drills 1-1.5mm lifting cutter scraps.
3. The method for processing the coaxial small hole of the circuit framework pin according to claim 1, characterized in that: in the step S5, the coaxiality of the threaded hole and the seal hole is detected by using the coaxial mandrel, and the coaxial mandrel does not pass through the seal hole, and the hole axis is shifted within the tolerance range to repair the hole until the coaxial mandrel passes through the seal hole.
4. The method for processing the coaxial small hole of the circuit framework pin according to claim 1, characterized in that: in the step S7, a drill with a diameter of 5.5mm is used to remove burrs on the surface of the tapped thread.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210456645.0A CN114770043B (en) | 2022-04-24 | 2022-04-24 | Method for processing coaxial small hole of circuit framework contact pin |
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| CN202210456645.0A CN114770043B (en) | 2022-04-24 | 2022-04-24 | Method for processing coaxial small hole of circuit framework contact pin |
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| CN114770043A true CN114770043A (en) | 2022-07-22 |
| CN114770043B CN114770043B (en) | 2023-01-31 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07299653A (en) * | 1994-05-06 | 1995-11-14 | Honda Motor Co Ltd | Machining method for stepped hole |
| CN103240565A (en) * | 2013-04-12 | 2013-08-14 | 大连创新零部件制造公司 | Method for machining deep stepped slotted hole |
| CN108115176A (en) * | 2017-12-18 | 2018-06-05 | 航天科工哈尔滨风华有限公司 | A kind of high-precision step shaft titanium alloy material Fine and Deep Hole high-efficiency machining method |
| CN108213506A (en) * | 2017-11-28 | 2018-06-29 | 中国航发西安动力控制科技有限公司 | The processing method of the small bearing hole of profound step in high precision |
| CN210755387U (en) * | 2019-10-22 | 2020-06-16 | 河北高工工具有限公司 | Alloy chamfering drill |
-
2022
- 2022-04-24 CN CN202210456645.0A patent/CN114770043B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07299653A (en) * | 1994-05-06 | 1995-11-14 | Honda Motor Co Ltd | Machining method for stepped hole |
| CN103240565A (en) * | 2013-04-12 | 2013-08-14 | 大连创新零部件制造公司 | Method for machining deep stepped slotted hole |
| CN108213506A (en) * | 2017-11-28 | 2018-06-29 | 中国航发西安动力控制科技有限公司 | The processing method of the small bearing hole of profound step in high precision |
| CN108115176A (en) * | 2017-12-18 | 2018-06-05 | 航天科工哈尔滨风华有限公司 | A kind of high-precision step shaft titanium alloy material Fine and Deep Hole high-efficiency machining method |
| CN210755387U (en) * | 2019-10-22 | 2020-06-16 | 河北高工工具有限公司 | Alloy chamfering drill |
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| CN114770043B (en) | 2023-01-31 |
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