CN114101729A - Large-scale flange bolt hole drilling method - Google Patents
Large-scale flange bolt hole drilling method Download PDFInfo
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- CN114101729A CN114101729A CN202111293494.3A CN202111293494A CN114101729A CN 114101729 A CN114101729 A CN 114101729A CN 202111293494 A CN202111293494 A CN 202111293494A CN 114101729 A CN114101729 A CN 114101729A
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- drilling
- hole
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B35/00—Methods for boring or drilling, or for working essentially requiring the use of boring or drilling machines; Use of auxiliary equipment in connection with such methods
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
Abstract
The invention relates to a method for drilling a bolt hole of a large flange, which comprises the following steps: step one, processing the external dimension, and finely processing the dimension of a large flange; drilling a central hole, and pointing the central hole at the position of a bolt hole; step three, drilling preparation, namely expanding the supporting range of the common drilling machine workbench by using the supporting seat; drilling and positioning, namely automatically positioning the drilling position of the flange by using the taper matching of the thimble and the central hole; drilling bolt holes, wherein the diameter of the drilled holes is increased from small to large, and the holes are drilled for multiple times; and step six, continuous drilling, namely, after the flange is moved to preliminarily position the drilling position, repeating the step four and the step five to complete drilling of all bolt holes. The drilling method for the large flange bolt hole saves equipment investment cost, occupies small area and has low processing cost.
Description
Technical Field
The invention relates to a method for drilling a bolt hole of a large flange, and belongs to the technical field of flange machining.
Background
The flange is a part for connecting the shafts and is also used for connecting pipe ends; and flanges used on the inlet and the outlet of the equipment are used for connecting the two pieces of equipment. The production process of the forged flange mainly comprises the procedures of blanking, heating, forging, cooling, machining and the like, different requirements are imposed on machining equipment in the machining link according to the size of the flange, particularly large flanges, due to the large size and heavy weight of the flange, the flange needs to be machined by a corresponding vertical lathe according to the shape and size of the flange, and a connecting bolt hole is drilled by a large numerical control machine or a drilling machine, the equipment of the large numerical control machine or the large drilling machine is expensive and occupies a large area, and additional matters such as back-and-forth transportation, loading and the like are needed if the flange is subjected to outsourcing machining, so that the number of machining links is increased, and the cost is increased. Therefore, a new way for machining large flange bolt holes by using the existing common drilling machine is needed.
Disclosure of Invention
The invention aims to overcome the defects and provide the large-scale flange bolt hole drilling method which is low in equipment investment, small in occupied area, free of requiring external machining and low in machining cost.
The purpose of the invention is realized as follows:
a drilling method for a large-scale flange bolt hole comprises the following steps:
step one, processing the outline dimension: mounting the flange qualified by rough machining on a vertical lathe for finish machining, and carrying out finish machining on the outer dimension of the flange, including the outer diameter, the inner diameter and the end face, by the vertical lathe;
step two, drilling a center hole: after finishing, drilling a conical positioning hole in the center of each bolt hole by using a center drill;
step three, drilling preparation: placing a plurality of supporting seats with the same horizontal height as a workpiece table of a drilling machine beside the drilling machine, and hoisting a flange with a drilled central hole to a platform consisting of the workpiece table and the supporting seats;
step four, drilling and positioning: mounting a conical thimble on the drilling machine, wherein the head part of the conical thimble is matched with the conical degree of the central conical hole in the second step; pressing down the thimble to press the conical head into the central conical hole, and sliding the flange on the drilling machine workpiece table and the supporting seat by utilizing the conical surface matching of the thimble and the central conical hole to automatically position the flange to the drilling position;
step five, drilling bolt holes: after the drilling and positioning are well carried out, the ejector pin is replaced by a small-diameter drill bit, a small-diameter hole is drilled, then the small-diameter drill bit is gradually replaced by a large-diameter drill bit, and the small-diameter hole is gradually expanded and drilled into a large-diameter hole; expanding the diameter of the drilled hole to the diameter of the bolt hole 3-5 times to finish drilling the bolt hole;
step six, continuous drilling: and (4) manually pushing the flange to slide on the drilling machine workpiece table and the supporting seat and rotate to the next bolt hole position, and repeating the fourth step and the fifth step until drilling of all bolt holes is completed.
The invention relates to a method for drilling a large flange bolt hole.
The invention relates to a method for drilling a large-scale flange bolt hole.
According to the drilling method for the large flange bolt hole, the diameter of the small-diameter drill bit in the fifth step is 20 mm.
Compared with the prior art, the invention has the beneficial effects that:
the invention ensures the drilling position precision of each bolt hole by carrying out center hole pointing on the bolt hole of the large flange; a plurality of supporting seats are arranged around a workpiece table of a common drilling machine to expand the supporting range of the workpiece table and ensure that a large flange is effectively supported; the flange automatically slides to the central point of a drilling hole by utilizing a conical head of the thimble and a central conical hole of the flange which are matched in taper, so that the position precision of the drilling hole is ensured; the drilling diameter is divided into a plurality of times from small to large, so that the drill bit or the drilling machine is prevented from being damaged due to overlarge drilling torque; after drilling is completed, the original drilling machine working environment can be recovered by recovering the supporting seat, a large numerical control lathe or a large drilling machine does not need to be input, outsourcing machining is not needed, the occupied area is small, and the machining cost is low.
Drawings
Fig. 1 is a working flow chart of a large-scale flange bolt hole drilling method of the invention.
Fig. 2 is a drilling schematic diagram of the large flange bolt hole drilling method of the invention.
Wherein:
Detailed Description
Referring to fig. 1-2, the invention relates to a method for drilling a large flange bolt hole, which comprises the following steps:
step one, processing the outline dimension: mounting the flange 1 qualified by rough machining on a vertical lathe for finish machining, and carrying out finish machining on the external dimension of the flange 1, including the external diameter, the internal diameter and the end face, by the vertical lathe;
step two, drilling a center hole: after finishing, drilling a conical positioning hole in the center of each bolt hole by using a center drill; utilizing the perpendicularity between a processing arm of a vertical lathe and a flange 1, mounting a center drill on the processing arm, rotating the flange 1, and drilling a tapered hole with the taper of 60 degrees at the center position of each bolt hole position by the center drill, thereby ensuring that the precision of the position of each center hole meets the requirement;
step three, drilling preparation: placing a plurality of supporting seats 3 with the same horizontal height as that of a workpiece table of the drilling machine 2 beside the drilling machine 2, and hoisting the flange 1 with the drilled central hole to a platform consisting of the workpiece table and the supporting seats 3; a lifting device is arranged on the supporting seat 3, and a graphite lubricating layer is arranged on the top surface of the supporting seat 3;
step four, drilling and positioning: mounting a conical thimble on the drilling machine 2, wherein the head part of the conical thimble is matched with the conical degree of the central conical hole in the second step; pressing down the thimble to press the conical head into the central conical hole, and sliding the flange 1 on the workpiece table and the supporting seat 3 of the drilling machine 2 by utilizing conical surface matching of the thimble and the central conical hole to automatically position the flange 1 to a drilling position;
step five, drilling bolt holes: after the drilling and positioning are well carried out, the ejector pin is replaced by a small-diameter drill bit, a small-diameter hole is drilled, then the small-diameter drill bit is gradually replaced by a large-diameter drill bit, and the small-diameter hole is gradually expanded and drilled into a large-diameter hole; the diameter of the small-diameter drill bit is 20mm, the diameter of the drill hole is expanded to the diameter of the bolt hole in 3-5 times, the bolt hole is drilled, and the drill bit or the drill machine 2 is prevented from being damaged;
for example: the diameter is 70 mm's flange bolt hole, and the order of drilling diameter does: drilling holes 20mm, 50mm and 70mm for 3 times; the diameter is 90 mm's flange bolt hole, and the order of drilling diameter does: drilling holes 20mm, 50mm, 70mm, 85mm and 90mm for 5 times;
step six, continuous drilling: manually pushing the flange 1 to slide and rotate on the workpiece table and the supporting seat 3 of the drilling machine 2 to the position of the next bolt hole, and repeating the fourth step and the fifth step until drilling of all the bolt holes is completed; after drilling is completed, the flange 1 is hoisted and stored in a warehouse, and the supporting seat 3 is recovered, so that the original working environment of the drilling machine 2 can be restored.
The center drill is a common cutter in machining, is mainly used for drilling a center hole of a shaft part, is widely applied to multifunctional numerical control equipment along with the gradual popularization of automation, and has the maximum function of being a point center hole so as to ensure the position precision of part hole machining.
The center hole is a positioning base surface for mounting the shaft workpiece on the tip. A 60-degree conical hole of the central hole is matched with a 60-degree conical surface on the tip; the central hole is commonly of type A and type B. The A-shaped central hole is only a 60-degree taper hole. The 120-degree conical surface at the outer end of the B-shaped central hole is also called a protection conical surface and is used for protecting the outer edge of the 60-degree conical hole from being damaged. And the A-type and B-type central holes are respectively processed on a lathe or a special machine tool by using corresponding central drills.
According to the method for drilling the bolt holes of the large flange, the bolt holes of the large flange can be drilled by using a common drilling machine without putting into a large numerical control lathe or a large drilling machine, the equipment investment is low, the occupied area is small, the outsourcing machining is not required, and the machining cost is low.
In addition: it should be noted that the above-mentioned embodiment is only a preferred embodiment of the present patent, and any modification or improvement made by those skilled in the art based on the above-mentioned conception is within the protection scope of the present patent.
Claims (4)
1. A large-scale flange bolt hole drilling method is characterized in that: the drilling method comprises the following steps:
step one, processing the outline dimension: mounting the flange qualified by rough machining on a vertical lathe for finish machining, and carrying out finish machining on the outer dimension of the flange, including the outer diameter, the inner diameter and the end face, by the vertical lathe;
step two, drilling a center hole: after finishing, drilling a conical positioning hole in the center of each bolt hole by using a center drill;
step three, drilling preparation: placing a plurality of supporting seats with the same horizontal height as a workpiece table of a drilling machine beside the drilling machine, and hoisting a flange with a drilled central hole to a platform consisting of the workpiece table and the supporting seats;
step four, drilling and positioning: mounting a conical thimble on the drilling machine, wherein the head part of the conical thimble is matched with the conical degree of the central conical hole in the second step; pressing down the thimble to press the conical head into the central conical hole, and sliding the flange on the drilling machine workpiece table and the supporting seat by utilizing the conical surface matching of the thimble and the central conical hole to automatically position the flange to the drilling position;
step five, drilling bolt holes: after the drilling and positioning are well carried out, the ejector pin is replaced by a small-diameter drill bit, a small-diameter hole is drilled, then the small-diameter drill bit is gradually replaced by a large-diameter drill bit, and the small-diameter hole is gradually expanded and drilled into a large-diameter hole; expanding the diameter of the drilled hole to the diameter of the bolt hole 3-5 times to finish drilling the bolt hole;
step six, continuous drilling: and (4) manually pushing the flange to slide on the drilling machine workpiece table and the supporting seat and rotate to the next bolt hole position, and repeating the fourth step and the fifth step until drilling of all bolt holes is completed.
2. The method for drilling the bolt holes in the large flange according to claim 1, wherein the method comprises the following steps: and the central conical positioning hole in the second step is drilled by using a central drill bit arranged on the vertical lathe, and the conical degree of the conical surface is 60 degrees.
3. The method for drilling the bolt holes in the large flange according to claim 1, wherein the method comprises the following steps: and a lifting device is arranged on the supporting seat in the third step, and a lubricating layer is arranged on the top surface of the supporting seat.
4. The method for drilling the bolt holes in the large flange according to claim 1, wherein the method comprises the following steps: the diameter of the small-diameter drill in the step five is 20 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111293494.3A CN114101729B (en) | 2021-11-03 | 2021-11-03 | Large-scale flange bolt hole drilling method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111293494.3A CN114101729B (en) | 2021-11-03 | 2021-11-03 | Large-scale flange bolt hole drilling method |
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| CN114101729A true CN114101729A (en) | 2022-03-01 |
| CN114101729B CN114101729B (en) | 2022-09-30 |
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| Application Number | Title | Priority Date | Filing Date |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0007523A1 (en) * | 1978-07-21 | 1980-02-06 | McPherson's Limited | Sheet material cutting device |
| US6186707B1 (en) * | 1999-09-10 | 2001-02-13 | The Boeing Company | Apparatus for locating holes to be drilled in post cure composite structures and associated method |
| CN103071825A (en) * | 2012-12-26 | 2013-05-01 | 武汉重工铸锻有限责任公司 | Processing method for unfair hole on arc surface of controllable-pitch propeller blade flange for boat |
| CN204234820U (en) * | 2014-10-31 | 2015-04-01 | 陈佳佳 | Half shaft flange one time boring grab |
| CN106041176A (en) * | 2016-07-01 | 2016-10-26 | 精益恒准（天津）数控设备股份有限公司 | Clamp for flange plate drilling |
| CN107414117A (en) * | 2017-07-28 | 2017-12-01 | 宁波市北仑辉旺铸模实业有限公司 | A kind of bore process that deep hole machining is carried out to hard material |
| CN110421195A (en) * | 2019-09-03 | 2019-11-08 | 郑州大学 | A kind of large-sized flange formula workpiece punching positioning device |
| US20190381578A1 (en) * | 2018-06-17 | 2019-12-19 | Arevo, Inc. | Embedding Fiducial Marks into Articles of Manufacture with Non-Trivial Dimensional Variations |
| CN212096995U (en) * | 2020-04-06 | 2020-12-08 | 黄加进 | Positioning mechanism for drilling of cement board |
-
2021
- 2021-11-03 CN CN202111293494.3A patent/CN114101729B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0007523A1 (en) * | 1978-07-21 | 1980-02-06 | McPherson's Limited | Sheet material cutting device |
| US6186707B1 (en) * | 1999-09-10 | 2001-02-13 | The Boeing Company | Apparatus for locating holes to be drilled in post cure composite structures and associated method |
| CN103071825A (en) * | 2012-12-26 | 2013-05-01 | 武汉重工铸锻有限责任公司 | Processing method for unfair hole on arc surface of controllable-pitch propeller blade flange for boat |
| CN204234820U (en) * | 2014-10-31 | 2015-04-01 | 陈佳佳 | Half shaft flange one time boring grab |
| CN106041176A (en) * | 2016-07-01 | 2016-10-26 | 精益恒准（天津）数控设备股份有限公司 | Clamp for flange plate drilling |
| CN107414117A (en) * | 2017-07-28 | 2017-12-01 | 宁波市北仑辉旺铸模实业有限公司 | A kind of bore process that deep hole machining is carried out to hard material |
| US20190381578A1 (en) * | 2018-06-17 | 2019-12-19 | Arevo, Inc. | Embedding Fiducial Marks into Articles of Manufacture with Non-Trivial Dimensional Variations |
| CN110421195A (en) * | 2019-09-03 | 2019-11-08 | 郑州大学 | A kind of large-sized flange formula workpiece punching positioning device |
| CN212096995U (en) * | 2020-04-06 | 2020-12-08 | 黄加进 | Positioning mechanism for drilling of cement board |
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