Method for machining countersunk bolt hole through chamfering drill bit and hollow drill bit
The use of angled and hollow drills with magnetic drilling for head bolt holes addresses the inefficiencies of traditional methods, enabling cost-effective and efficient on-site processing.
Patent Information
- Application Number
- CN202510600677.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-12
- Publication Date
- 2025-07-15
AI Technical Summary
In the cold repair of new energy tank furnaces, the processing cost of counterhead bolt holes is high and is inconvenient for on-site operation. The traditional method requires large-scale mechanical equipment or expensive drilling, resulting in high freight and procurement costs.
The chamfered drill bit and hollow drill bit are combined with magnetic drill. The counterhead bolt holes are processed on the pallet through steps S10, S20, and S30, and the processing is performed using small table drills and magnetic drills, saving drill bits and labor costs and reducing auxiliary materials costs.
It realizes efficient and low-cost counterbolt bolt hole processing on site, reduces freight and equipment procurement costs, improves processing quality and efficiency, and is suitable for ordinary workers' operations.
Smart Images
Figure CN120306675A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the field of countersunk bolt hole machining, specifically a method for machining countersunk bolt holes using a chamfer drill and a hollow drill. Background Art
[0002] When cold repairing and masonry of a new energy furnace, the breast wall support plate of the furnace passage and the breast wall support plate bracket need to be connected with countersunk bolts. Before installation, the countersunk bolt holes need to be machined.
[0003] There are mainly two traditional machining methods: 1) Using a machine tool for machining, entrusting an external large mechanical processing factory to machine the countersunk bolt holes. After the breast wall support plate is manufactured, it needs to be transported to the processing factory, with relatively high freight and processing costs; 2) Using a twist drill for drilling, but a large bench drill capable of assembling a 35 mm twist drill is required. The large-diameter twist drill is used for secondary machining of the assembly position of the countersunk bolt head. The purchase price of such a large bench drill is relatively expensive, with a large investment, and the number of countersunk bolt holes on site is small, making it not worth the investment.
[0004] Therefore, those skilled in the art have provided a method for machining countersunk bolt holes using a chamfer drill and a hollow drill to solve the problems raised in the above background art. Summary of the Invention
[0005] The purpose of the present invention is to provide a method for machining countersunk bolt holes using a chamfer drill and a hollow drill to solve the problems raised in the above background art.
[0006] To achieve the above purpose, the present invention provides the following technical solution: A method for machining countersunk bolt holes using a chamfer drill and a hollow drill, comprising the following steps: Step S10: First, use a magnetic drill of a hollow drill one to drill a ring groove on the support plate to form a round hole, meeting the hole diameter requirements for screw assembly; Step S20: Then use a magnetic drill of a hollow drill two to drill a ring groove on the support plate to machine the depth of the countersunk bolt head. This step can accelerate the cutting speed of the chamfer drill in step S30, save the number of chamfer drills used, and improve the machining quality of the bolt hole; Step S30: Assemble the chamfer drill to machine the assembly position of the bolt head, machining off the protrusion between the ring groove machined by the hollow drill two in step S20 and the round hole machined in step S10, ensuring that there is no misalignment between the head of the countersunk bolt and the support plate plane after assembly, meeting the masonry requirements of the upper bricks of the breast wall support plate.
[0007] As a further scheme of the present invention: In step S20, the machining depth of the hollow drill two is the same as the head thickness of the countersunk thread.
[0008] As a further solution of the present invention: the first hollow drill bit, the second hollow drill bit and the chamfer drill bit can also be clamped on a small bench drill for operation, and steps S10, S20 and S30 are all processed at the concentric position of the pallet.
[0009] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention can process countersunk bolt holes at any time and place. The magnetic drill and the small bench drill are standard construction tools during construction. There is no need to increase the procurement cost of tools. Only the hollow drill bit and the chamfer drill bit need to be purchased. They are cheap. Drilling with cutting fluid saves drill bits and reduces the cost of auxiliary materials. The magnetic drill and the bench drill are easy to operate, have no high technical requirements, do not require professional technical personnel, and ordinary workers can operate, so the labor cost invested is relatively low. Description of the Drawings
[0010] Figure 1 It is a schematic diagram of step S10 in the present invention; Figure 2 It is a schematic diagram of step S20 in the present invention; Figure 3 It is a schematic diagram of step S30 in the present invention.
[0011] In the figure: 1, the first hollow drill bit; 2, the second hollow drill bit; 3, the chamfer drill bit. Detailed Embodiments
[0012] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
[0013] Please refer to Figures 1 to 3 , in the embodiment of the present invention, a method for processing a countersunk bolt hole using a chamfer drill bit and a hollow drill bit includes the following steps: Step S10: As Figure 1 shown, first use the magnetic drill of the first hollow drill bit 1 to drill a ring groove on the pallet to form a round hole, meeting the hole diameter required for the screw assembly; Step S20: As Figure 2 shown, then use the magnetic drill of the second hollow drill bit 2 to drill a ring groove on the pallet to process the depth of the head of the countersunk bolt. This step can accelerate the cutting speed of the chamfer drill bit 3 in step S30, save the usage quantity of the chamfer drill bit 3, and improve the processing quality of the bolt hole; Step S30: As Figure 3As shown, assemble the chamfer drill 3 to machine the assembly position of the bolt head, and machine the protrusion between the ring groove part machined by the hollow drill 2 in step S20 and the round hole machined in step S10, so as to ensure that there is no offset between the head of the countersunk bolt and the plane of the supporting plate after assembly, meeting the masonry requirements of the bricks on the upper part of the breast wall supporting plate.
[0014] After adopting this method, the countersunk bolt holes can be machined anytime and anywhere. The magnetic drill and small bench drill are standard construction tools during construction, without the need to increase the procurement cost of tools. Only the hollow drill and chamfer drill 3 need to be purchased, which are cheap. Drilling with cutting fluid saves the drill bits and reduces the cost of auxiliary materials. The magnetic drill and bench drill are easy to operate, without high technical requirements, and do not require professional technical personnel. Ordinary workers can operate them, and the labor cost input is relatively low.
[0015] Among them, the machining depth of the hollow drill 2 in step S20 is the same as the head thickness of the countersunk thread.
[0016] Among them, the hollow drill 1, hollow drill 2, and chamfer drill 3 can also be clamped on a small bench drill for work, and steps S10, S20, and S30 are all machined at the concentric position of the supporting plate. Embodiment 1
[0017] Taking the countersunk bolt hole of M20*80 as an example, the head diameter of the M20 countersunk bolt is 35mm, the head length is about 1 cm, the thickness of the supporting plate is 40mm, and the machining steps of the countersunk bolt hole are as follows: Step S10: First, use a magnetic drill equipped with an M22*50 hollow drill to machine a round hole of M20 to meet the hole diameter required for the screw assembly; Step S20: Then use a magnetic drill equipped with an M35*35 hollow drill to drill to a depth of about 1 cm to machine the depth of the countersunk bolt head. This step can accelerate the cutting speed of the chamfer drill 3 in step S30, save the usage quantity of the chamfer drill 3, and improve the machining quality of the bolt hole; Step S30: Assemble the M35*90-degree chamfer drill 3 to machine the assembly position of the bolt head, ensuring that there is no offset between the head of the countersunk bolt and the plane of the supporting plate after assembly, meeting the masonry requirements of the bricks on the upper part of the breast wall supporting plate.
[0018] There are a total of 126 countersunk bolt holes in this project. The processing and manufacturing consumed a total of 3 people * 1.5 man-days = 4.5 man-days. The average daily wage of the 3 workers is 280 yuan, so the labor cost is 4.5 man-days * 280 yuan / man-day = 1260 yuan. 3 hollow drill bits, 31 chamfer drill bits, and 1 bottle of cutting fluid were consumed. The cost of auxiliary materials is 3 * 68 yuan / bit + 1 * 65 yuan / bit + 19 yuan = 288 yuan. The total cost of labor and auxiliary materials is 1548 yuan. If external processing is arranged, only the round-trip freight needs to be paid 1400 yuan. Adding the drilling processing fee, the cost will be much higher than the manufacturing cost on-site of the project.
[0019] The construction technology for processing the countersunk bolt holes with hollow drill bits and chamfer drill bits has high processing efficiency and good bolt assembly quality. There is no need to pay expensive processing fees and in-and-out freight for external processing. When the drill bits are used in construction with cutting fluid, it can greatly reduce the wear degree of the drill bits, reduce the consumption of drill bits, lower the procurement cost of auxiliary materials, and save the project cost investment.
[0020] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered within the protection scope of the present invention.
Claims
1. A method for machining a countersunk bolt hole using a chamfering drill bit and a core drill bit, characterized in that: The method includes the following steps: Step S10: First, use the magnetic drill of the hollow drill bit 1 (1) to drill a ring groove on the pallet to form a round hole with a hole diameter that meets the requirements for screw assembly. Step S20: Then, use the magnetic drill of the hollow drill bit 2 (2) to drill a ring groove on the pallet to process the depth of the countersunk bolt head. Step S30: Assemble the chamfer drill bit (3) to process the assembly position of the bolt head, and remove the protrusion between the ring groove processed by the hollow drill bit 2 (2) in Step S20 and the round hole processed in Step S10.
2. The method for machining a countersunk bolt hole by using a chamfer drill and a core drill according to claim 1, characterized in that: In Step S20, the processing depth of the hollow drill bit 2 (2) is the same as the head thickness of the countersunk thread.
3. The method for machining a countersunk bolt hole using a chamfer drill and a core drill according to claim 1, characterized in that: The hollow drill bit 1 (1), the hollow drill bit 2 (2), and the chamfer drill bit (3) can also be clamped on a small bench drill for work, and Steps S10, S20, and S30 are all processed at the concentric position of the pallet.