Cutting tool and device for drilling thin-wall pipe fitting

Abstract

The utility model discloses a thin-wall pipe fitting drilling machining cutter, which relates to the technical field of thin-wall pipe fitting drilling machining, and comprises a cutter body, a blade and a cutter handle, the cutter body is of a cylindrical structure, one end of the cutter body is a drilling end, the other end of the cutter body is a tail end, the blade is arranged at the drilling end of the cutter body, the cutter handle is arranged at the tail end of the cutter body, and the cutter handle and the cutter body are coaxially arranged; when a lathe drives the cutter body to rotate through the cutter handle, the blade can drill a bar, so that a cavity and the outer wall of the bar are separated to form a pipe, the waste material rate can be reduced, and the machining efficiency can be improved. The utility model further discloses a thin-wall pipe fitting drilling device which comprises a lathe, an inner hole turning tool and the thin-wall pipe fitting drilling tool.

Description

Technical Field

[0001] The utility model relates to the technical field of drilling processing of thin-walled pipe fittings, in particular to a drilling processing tool and device for thin-walled pipe fittings. Background Technique

[0002] With the increasingly wide application requirements of subsea equipment, it brings challenges to the special requirements of components under high-pressure environments. The existing hollow pipe 01, as Figure 1 shown, the outer diameter of this part is 320 mm, the inner diameter is 270 mm, and the length is 800 mm. It belongs to a thin-walled part and is prone to deformation. The length-diameter ratio is 3:1. If the finished pipe made by extrusion forming is used, defects such as cracks are likely to occur, and it is not suitable for high external pressure environments, that is, not suitable for deep-sea high external pressure environments. Therefore, the forging bar blank hollowing processing technology needs to be used to manufacture the hollow pipe 01. For example, the aluminum alloy bar blank is processed by drilling the cavity to meet the high-pressure requirements of the part in the subsea environment.

[0003] At present, for the processing of aluminum alloy bar blanks, the traditional drilling and boring process has always been used. This process uses the overall hollowing method of the inner cavity and removes the cavity of the bar blank in sequence by using the drill bit size for different processes. However, this processing method has problems such as high waste rate, low processing efficiency, easy formation of waste materials, and resulting in the scrapping of the overall material.

[0004] It can be seen that how to provide a tool for drilling and processing thin-walled pipe fittings to improve the processing efficiency and reduce the waste rate is an urgent problem to be solved at present. Content of the Utility Model

[0005] The purpose of the utility model is to provide a drilling processing tool and device for thin-walled pipe fittings to solve the problems existing in the above-mentioned prior art. Through the annular hollow thin-walled drill bit type tool for drilling processing, the cavity of the bar blank is separated from the outer wall to achieve the forming purpose of the bar blank to the pipe material, which can reduce the waste rate and improve the processing efficiency.

[0006] To achieve the above purpose, the utility model provides the following scheme:

[0007] The utility model provides a drilling processing tool for thin-walled pipe fittings, including a tool body, a blade and a tool handle. The tool body is of a cylindrical structure. One end of the tool body is a drilling end, and the other end is a tail end. The blade is arranged at the drilling end of the tool body, and the tool handle is arranged at the tail end of the tool body, and the tool handle is coaxially arranged with the tool body; when the lathe drives the tool body to rotate through the tool handle, the blade can drill the bar blank so that the cavity of the bar blank is separated from the outer wall to form a pipe material.

[0008] Preferably, one end of the blade is provided with a cutting edge, and the other end is used for being embedded in the drilling end of the tool body, and the cutting edge of the blade extends along the tangent direction of the drilling end of the tool body.

[0009] Preferably, a plurality of the blades are provided, and all the blades are evenly distributed at the drilling end of the tool body.

[0010] Preferably, the width of the blade is greater than the wall thickness of the barrel of the tool body.

[0011] Preferably, the blade is a cemented carbide alloy blade.

[0012] Preferably, the tool handle is fixed to the tail end of the tool body through a connecting plate. The connecting plate is a circular plate and matches the end face of the tail end of the tool body. A through hole is provided on the connecting plate, and the through hole is used for introducing cutting fluid.

[0013] Preferably, the taper of the tool handle is a Morse tool handle taper.

[0014] The present utility model further provides a drilling processing device for thin-walled pipe fittings, including a lathe, an internal hole turning tool, and the above-mentioned drilling processing tool for thin-walled pipe fittings. A clamping mechanism is provided at one end of the lathe, and a tailstock tool sleeve is provided at the other end. The clamping mechanism is used for clamping a bar stock. The drilling processing tool for thin-walled pipe fittings can be installed in the tailstock tool sleeve to drill the bar stock, so that the cavity of the bar stock is separated from the outer wall to form a pipe stock. The internal hole turning tool can be installed in the tailstock tool sleeve to perform finish machining on the inner hole of the pipe stock.

[0015] Preferably, the clamping mechanism is a four-jaw chuck.

[0016] Preferably, the lathe is a pipe thread lathe.

[0017] The present utility model has achieved the following technical effects compared with the prior art:

[0018] The drilling processing tool for thin-walled pipe fittings provided by the present utility model includes a tool body, a blade, and a tool handle. The tool body is of a cylindrical structure. The blade is arranged at the drilling end of the tool body, and the tool handle is coaxially arranged at the tail end of the tool body. When in use, the tool body is installed in the tailstock tool sleeve of the lathe through the tool handle, and the lathe drives the tool body together with the blade to rotate to perform drilling processing on the bar stock, so that the cavity of the bar stock is separated from the outer wall to form a pipe stock, which can reduce the waste rate and improve the processing efficiency. Description of the Drawings

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0020] Figure 1 It is a perspective view of an existing hollow pipe.

[0021] Figure 1 In the figure: 01 - hollow pipe.

[0022] Figure 2 It is the front view of the drilling tool for thin - wall pipe fittings provided by the embodiment of the present utility model;

[0023] Figure 3 It is the left view of the drilling tool for thin - wall pipe fittings provided by the embodiment of the present utility model;

[0024] Figure 4 It is the perspective view of the drilling tool for thin - wall pipe fittings provided by the embodiment of the present utility model;

[0025] Figure 5 It is the front view of the tool body provided by the embodiment of the present utility model;

[0026] Figure 6 It is the front view of the blade provided by the embodiment of the present utility model;

[0027] Figure 7 It is the left view of the blade provided by the embodiment of the present utility model;

[0028] Figure 8 It is the top view of the blade provided by the embodiment of the present utility model;

[0029] Figure 9 It is the perspective view of the blade provided by the embodiment of the present utility model;

[0030] Figure 10 It is the front view of the tool handle and the connecting plate provided by the embodiment of the present utility model.

[0031] Figures 2 - 10 In the figure: 1 - tool body, 2 - blade, 3 - tool handle, 4 - connecting plate, 5 - through hole. Detailed implementation manners

[0032] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

[0033] The purpose of the present utility model is to provide a drilling tool and device for thin - wall pipe fittings to solve the problems existing in the prior art. Through the drilling process with a ring - shaped hollow thin - wall drill bit type tool, the cavity of the bar stock is separated from the outer wall, achieving the forming purpose from bar stock to pipe stock, which can reduce the waste rate and improve the processing efficiency.

[0034] In order to make the above objects, features, and advantages of the present utility model more obvious and understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] As Figures 2 - 4 shown, this embodiment provides a drilling tool for thin-walled pipe fittings, including a tool body 1, a blade 2, and a tool handle 3. As Figure 5 shown, the tool body 1 is a cylindrical structure. One end of the tool body 1 is a drilling end (i.e., the left end of the tool body 1 in Figure 5 ), and the other end is a tail end (i.e., the right end of the tool body 1 in Figure 5 ). The blade 2 is arranged at the drilling end of the tool body 1, and the tool handle 3 is arranged at the tail end of the tool body 1, and the tool handle 3 is coaxially arranged with the tool body 1; when the lathe drives the tool body 1 to rotate through the tool handle 3, the blade 2 can drill the rod material so that the cavity of the rod material is separated from the outer wall to form a pipe material.

[0036] In this embodiment, as Figures 6 - 9 shown, one end of the blade 2 is provided with a cutting edge, and the other end is used for embedding in the drilling end of the tool body 1, and the cutting edge of the blade 2 extends along the tangent direction of the drilling end of the tool body 1; specifically, the blade 2 in this embodiment is a cemented carbide alloy blade. As Figure 6 shown, the included angle between the two cutting surfaces on the top of the blade 2 is preferably 120°.

[0037] Furthermore, six blades 2 are provided, and all the blades 2 are evenly distributed at the drilling end of the tool body 1 to ensure uniform drilling force and reduce vibration during the processing.

[0038] In this embodiment, the width of the blade 2 (with the left-right direction in Figure 8 being the width direction of the blade 2) is greater than the wall thickness of the tool body 1. This design can greatly improve the wear resistance of the tool and ensure smooth chip removal during the processing; specifically, the width of the blade 2 in this embodiment is preferably 12 mm.

[0039] In this embodiment, as Figure 10 shown, the tool handle 3 is fixed to the tail end of the tool body 1 through a connecting plate 4. The connecting plate 4 is a circular plate, and the connecting plate 4 matches the end face of the tail end of the tool body 1; a through hole 5 is provided on the connecting plate 4, and the through hole 5 is used for introducing cutting fluid; specifically, the diameter of the through hole 5 on the connecting plate 4 in this embodiment is preferably 20 mm. During use, the through hole 5 is connected to the cutting fluid pipe to facilitate lubrication and chip removal.

[0040] In this embodiment, in order to ensure the concentricity with the part to be processed, the taper of the tool handle 3 is the Morse tool handle taper. When the tool handle 3 is connected to the tailstock tool sleeve of the lathe, it can ensure that the center of the part to be processed coincides with the center of this tool to the greatest extent.

[0041] This embodiment also provides a drilling and machining device for thin-walled pipe fittings, which includes a lathe, an internal hole turning tool, and the above-mentioned drilling and machining tool for thin-walled pipe fittings; a clamping mechanism is arranged at one end of the lathe, and a tailstock tool sleeve is arranged at the other end. The clamping mechanism is used to clamp the bar stock, and the drilling and machining tool for thin-walled pipe fittings can be installed in the tailstock tool sleeve to drill the bar stock, so that the cavity of the bar stock is separated from the outer wall to form a pipe stock; the internal hole turning tool can be installed in the tailstock tool sleeve to finish machine the internal hole of the pipe stock to ensure the dimensional accuracy of the internal hole of the pipe stock and the surface finish of the inner surface.

[0042] In this embodiment, the clamping mechanism is a four-jaw chuck. Selecting a four-jaw chuck to clamp the part to be machined can keep the part to be machined in the best stability during the machining process and reduce the occurrence of vibration.

[0043] In this embodiment, the lathe is a pipe thread lathe. Selecting a pipe thread lathe can make the part to be machined extend into the inside of the four-jaw chuck, and try to keep the shortest distance between the clamping part of the four-jaw chuck and the drilling position of the part to be machined, so as to reduce vibration.

[0044] For the use of the drilling and machining device for thin-walled pipe fittings provided in this embodiment, the process of machining a bar stock made of 7075 aluminum alloy into a pipe stock is described as follows:

[0045] (1) Part machining characteristics and machining difficulties

[0046] Part machining characteristics: The material of the bar stock is 7075 aluminum alloy. This type of aluminum alloy is a high-strength aluminum alloy material. Compared with ordinary steel, it has a lower density and extremely high tensile strength. It belongs to one of the high-strength aluminum alloys. However, during the machining process of this material, it is easy to have poor chip evacuation, resulting in tool sticking and tool jamming phenomena, and has high requirements for tools and processes.

[0047] Machining difficulties: First, high hardness. Due to its high strength, 7075 aluminum alloy has relatively high hardness, which increases the difficulty of cutting. High hardness puts higher requirements on the selection of tools and the optimization of cutting parameters; second, poor thermal conductivity. Compared with some other aluminum alloys, 7075 aluminum alloy has poor thermal conductivity. During high-speed cutting, more heat may be generated, so more caution is needed in the selection of cutting parameters; third, easy to generate chips. 7075 aluminum alloy is easy to generate fine chips during the machining process, which may cause certain troubles to the subsequent chip evacuation operation and requires special attention.

[0048] (2) Determination of machining parameters

[0049] In the initial machining, our aim is to quickly remove the excess material. While in the finishing stage, for this part, we focus on improving its surface finish and dimensional accuracy. By adjusting the cutting speed, feed rate, and cutting depth, we ensure the quality of the part and give full play to the advantages of the new process to meet the design requirements. The following is the specific plan for setting the cutting speed, feed rate, and cutting depth.

[0050] First, the cutting speed: During the processing of the first operation, to avoid poor chip evacuation in the annular area of the tool, during turning, the cutting speed is appropriately reduced. This is beneficial for chip evacuation and can effectively reduce the temperature in the cutting area, thus ensuring the normal operation of the drill bit. In the finishing stage of the second operation, moderately reducing the turning speed can effectively reduce the heat accumulation during cutting and prevent overheating from damaging the crystal phase of the surface of the component material. For the machining of this part, the cutting speed of the drilling tool for the thin-walled pipe fitting is selected as 40 r / min. In the finishing stage, the boring tool is replaced and the cutting speed is further adjusted to 60 r / min.

[0051] Second, the feed rate: During the machining process, a smaller feed rate is required to ensure a more delicate cutting process and improve the machining accuracy of the component. In the finishing stage, moderately reducing the feed rate helps to make the turning process smoother and improve the surface finish of the component. In the processing stage of the first operation, the set feed rate is 15 mm / m i n , while in the finishing stage of the second operation, the feed rate is adjusted to 60 mm / m i n .

[0052] Third, the finishing cutting allowance: In the finishing stage of the second operation, a smaller cutting depth is required, which helps to ensure the machining consistency of the component in the radial direction and further improve the dimensional accuracy. During this machining process, to ensure the finishing accuracy, the finishing unilateral allowance is 2 mm and it is fed in 4 times. At the same time, by moderately reducing the cutting depth, the formation of chips can be better controlled and the influence of residual chips on the component can be reduced. See Table 1 for details:

[0053] Table 1

[0054] Process Name Rotational Speed Feed Rate Single Feed Tool First Process (End Face 1) V = 40 r / min F = 15 mm / min None Hollow Thin-Wall Drill Second Process (End Face 1) 60 r / min F = 60 mm / min 0.5 mm Internal Hole Turning Tool First Process (End Face 2) V = 40 r / min F = 15 mm / min None Hollow Thin-Wall Drill Second Process (End Face 2) 60 r / min F = 60 mm / min 0.5 mm Internal Hole Turning Tool

[0055] (3) Determination of the process

[0056] To ensure the clamping requirements, in this machining, a pipe thread lathe is used and the method of feeding from both ends of the blank is adopted. Combined with the thin-walled pipe fitting drilling tool provided in this embodiment, the drilling of the 7075 aluminum alloy rod is realized. The whole process is divided into two main steps, corresponding to the machining of the two ends of the rod respectively.

[0057] Step 1, machining one end of the blank using the drilling tool for thin-walled pipe fittings: First, drill one end of the bar stock using the drilling tool for thin-walled pipe fittings; this step aims to quickly and efficiently separate the outer wall of the bar stock from the cavity and provide a good machining premise for the subsequent finishing stage.

[0058] Finish machining using an internal hole turning tool: After the drilling of one end is completed, finish machine the internal hole of this pipe end using an internal hole turning tool; the internal hole turning tool for finish machining can ensure the dimensional accuracy and surface quality of the internal hole, meeting the requirements of the part.

[0059] Step 2, machining the other end of the blank using the drilling tool for thin-walled pipe fittings: For the swapped part, perform drilling using the same drilling tool for thin-walled pipe fittings; this step is similar to the machining of the first end, ensuring the separation and removal of materials from the second end.

[0060] Finish machining again using an internal hole turning tool: After the drilling is completed, use the internal hole turning tool again to finish machine the internal hole of this end; the purpose of this step is the same as that of the first end, ensuring that the size and surface quality of the internal hole meet the requirements.

[0061] This process has the following advantages:

[0062] First, efficiently removing excess material using the drilling tool for thin-walled pipe fittings: By using a ring-shaped hollow thin-walled drill bit type tool for drilling, excess material can be efficiently removed, reducing waste, improving machining efficiency, and at the same time, the remaining cavity after machining can be used as the blank for the remaining parts, significantly reducing costs.

[0063] Second, finish machining using an internal hole turning tool: Using an internal hole turning tool to finish machine the pipe material ensures the dimensional accuracy and surface quality of the internal hole, meeting the precision requirements of the part.

[0064] Through the above process, we have fully utilized the advantages of the drill bit to achieve efficient and precise machining of 7075 aluminum alloy bar stock, and finally the part has met the design requirements.

[0065] (4) Related precautions

[0066] In the above new process, a series of issues need to be particularly noted, including tool maintenance, cooling and lubrication, workpiece clamping, machining stability, and chip removal problems.

[0067] First, tool maintenance: Since the hardness of 7075 aluminum alloy is relatively high, the wear of the tool during the cutting process is relatively obvious. Therefore, it is necessary to check the wear condition of the tool at any time; if the tool is not sharp enough, it may cause the tool teeth to fall off, affecting the machining effect, and even may lead to the scrapping of the part.

[0068] Second, cooling and lubrication: During the machining process, in order to reduce cutting heat, avoid affecting the surface crystal structure of the machined material, and at the same time extend the tool life, an appropriate amount of cooling lubricant must be used; however, excessive use of the lubricant may cause the cutting fluid to splash from the circumference, affecting the machining environment and personnel safety; therefore, it is necessary to find a balance in the use of the lubricant to ensure sufficient cooling and chip evacuation while avoiding cutting fluid splash.

[0069] Third, workpiece clamping: The workpiece clamping ability of a conventional lathe is not easy to control compared to a CNC lathe. The wall thickness of this part is relatively small. Excessive clamping force may damage the workpiece, while too small a clamping force may cause the workpiece to move, affecting the machining accuracy. To prevent workpiece vibration during machining, special attention needs to be paid to the reasonable distribution of the clamping force. In this case, a four-jaw chuck is used, which is more stable than a three-jaw chuck that can center the workpiece, but has higher requirements for the clamping force.

[0070] Fourth, machining stability: The pipe thread lathe is less automated than the CNC lathe, and more attention needs to be paid to machining stability during the machining process; due to the lack of precise control of the CNC system, the operator needs to be particularly careful in operation, keep the feed speed stable, and avoid workpiece vibration caused by rapid changes.

[0071] Fifth, chip evacuation problem: In the new machining process, the strategy of machining both ends separately is adopted, which easily leads to difficult chip evacuation; because there is no fully enclosed protection, the cutting fluid of the conventional lathe cannot be too large, so its chip evacuation performance is relatively weak. Poor chip evacuation may cause excessive chips to accumulate inside the parts, affecting subsequent machining steps. Therefore, it is necessary to stop the machine regularly to clean the chips to ensure smooth chip evacuation.

[0072] In summary, the new process adopts the thin-walled pipe fitting drilling tool and device provided in this embodiment, as well as the strategy of machining both ends separately. The core material taken can be further processed and utilized, significantly reducing the waste material rate and improving the machining efficiency; through the optimized design of the tool, the optimization of cutting parameters, and the reasonable clamping design, problems such as tool sticking, cold cutting, chip evacuation, and vibration are effectively solved, ensuring the quality of the parts; the new process using the thin-walled pipe fitting drilling tool and device provided in this embodiment has obvious advantages over the traditional drilling and boring process in terms of waste material rate and machining efficiency, and is suitable for popularization and application.

[0073] In the present utility model, specific examples are used to elaborate on the principle and implementation manner of the present utility model. The description of the above embodiments is only used to help understand the method and its core idea of the present utility model; at the same time, for those of ordinary skill in the art, according to the idea of the present utility model, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present utility model.

Claims

1. A drilling tool for thin-walled pipe fittings, characterized in that: It includes a tool body, a cutting blade and a tool handle. The tool body has a cylindrical structure. One end of the tool body is a drilling end, and the other end is a tail end. The cutting blade is arranged at the drilling end of the tool body, and the tool handle is arranged at the tail end of the tool body, and the tool handle is coaxially arranged with the tool body; when the lathe drives the tool body to rotate through the tool handle, the cutting blade can drill the bar stock so that the cavity of the bar stock is separated from the outer wall to form a tubular stock.

2. The thin-walled pipe fitting drilling tool according to claim 1, wherein: One end of the cutting blade is provided with a cutting edge, and the other end is used for being embedded in the drilling end of the tool body, and the cutting edge of the cutting blade extends along the tangent direction of the drilling end of the tool body.

3. The drilling tool for thin-walled pipe fittings according to claim 2, characterized in that: A plurality of the cutting blades are provided, and all the cutting blades are evenly distributed at the drilling end of the tool body.

4. The thin-walled pipe fitting drilling tool according to claim 1, characterized in that: The width of the cutting blade is greater than the wall thickness of the tool body.

5. The thin-walled pipe fitting drilling tool according to claim 1, characterized in that: The cutting blade is a hard alloy steel cutting blade.

6. The thin-walled pipe fitting drilling tool according to claim 1, wherein: The tool handle is fixed to the tail end of the tool body through a connecting plate. The connecting plate is a circular plate, and the connecting plate matches the end face of the tail end of the tool body; a through hole is arranged on the connecting plate, and the through hole is used for introducing cutting fluid.

7. The thin-walled pipe drilling tool according to claim 1, characterized in that: The taper of the tool handle is a Morse tool handle taper.

8. A drilling processing device for thin-walled pipe fittings, characterized in that: It includes a lathe, an internal hole turning tool and a thin-walled pipe fitting drilling and processing tool according to any one of claims 1-7; a clamping mechanism is arranged at one end of the lathe, and a tailstock tool sleeve is arranged at the other end. The clamping mechanism is used for clamping the bar stock. The thin-walled pipe fitting drilling and processing tool can be installed in the tailstock tool sleeve to drill the bar stock so that the cavity of the bar stock is separated from the outer wall to form a tubular stock; the internal hole turning tool can be installed in the tailstock tool sleeve to finish machining the inner hole of the tubular stock.

9. The thin-walled pipe fitting drilling device according to claim 8, characterized in that: The clamping mechanism is a four-jaw chuck.

10. The thin-walled pipe fitting drilling device according to claim 8, characterized in that: The lathe is a pipe thread lathe.

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