A tool design method and processing method for fine slot deburring

Abstract

The present application relates to the technical field of aviation machining, and particularly relates to a cutter design method and machining method for deburring of small notches. The method comprises the following steps: setting cutter specifications, cutter materials and cutter technical requirements used in the machining process; in the cutter specification selection aspect, cutter specifications are designed according to the size specifications of skeleton parts (TA18-G4x0.5, TA18-G4.5x0.5, TA18-G5x0.5, TA18-G6x0.5, TA18-G6.5x0.5, TA18-G7x0.5); in the cutter material selection aspect, cutter materials are determined based on the machining difficulties of titanium alloy materials; in the cutter technical requirement aspect, the overall straightness and the coaxiality of the front drill bit and the rear optical shaft are specified as the two technical requirements that should be paid attention to when machining the cutter based on the appearance size characteristics of the parts and the use characteristics of the parts; after the above three aspects are completed, the first tooling body and the second tooling body can be press-fitted to realize the cutter design for deburring of the small notches on the inner wall of the skeleton parts.

Description

Technical Field

[0001] This invention relates to the field of aerospace machining technology, and in particular to a tool design method and machining method for deburring small grooves. Background Technology

[0002] The aerospace mechanical manufacturing field contains a large number of linear displacement sensors, and titanium alloy skeleton parts are important structural components of these sensors. They possess high corrosion resistance, fatigue strength, and lifespan, thus finding wide application in aerospace and other fields. For example... Figure 1 As shown, titanium alloy skeleton parts are thin-walled components with a wall thickness of 0.5 mm and a length-to-diameter ratio of 50:1. These parts exhibit poor stability during machining, significant deformation, and numerous burrs. Furthermore, burrs are a critical characteristic during actual assembly, requiring extremely high burr removal efficiency. Traditional fitter machining methods, using scrapers and files, can only remove burrs from the small grooves on the outer surface. Due to the part's structure, effective removal of burrs from the small grooves on the inner wall is not feasible. Burr accumulation on the inner wall of the skeleton can cause jamming of the core connecting rod assembly and changes in the core's magnetic properties, failing to meet the requirements of normal batch production and assembly debugging. Summary of the Invention

[0003] The purpose of this invention is to provide a cutting tool and processing method for deburring small grooves that has high processing efficiency and stable and reliable processing quality.

[0004] The technical solution of this invention is:

[0005] Firstly, a tool design method for deburring fine grooves is provided, comprising the following steps:

[0006] Set the specifications, materials, and technical requirements of the cutting tools used in the machining process;

[0007] Regarding tool selection, tool specifications are designed for the dimensions of skeleton-type parts (TA18-G4×0.5, TA18-G4.5×0.5, TA18-G5×0.5, TA18-G6×0.5, TA18-G6.5×0.5, TA18-G7×0.5).

[0008] Regarding the selection of tool materials, the tool materials were determined based on the difficulties in machining titanium alloy materials;

[0009] Regarding the technical requirements for cutting tools, based on the appearance and dimensional characteristics of the parts and their usage characteristics, it is stipulated that when machining cutting tools, attention should be paid to two aspects: overall straightness and coaxiality between the front drill bit and the rear optical axis.

[0010] Once the above three requirements are met, the first and second tooling bodies can be press-fitted to achieve the tool design for deburring the small grooves on the inner wall of skeleton-type parts.

[0011] Secondly, a machining method for deburring fine grooves is provided, characterized in that a tool designed using a tooling method for deburring fine grooves is employed, and the method includes:

[0012] Mount the cutting tool onto the bench drill and set the speed of the bench drill and the distance between the drill chuck and the worktable during the machining process;

[0013] The fitter holds the outer circle of the part and uses a cutting tool to reciprocate from both ends of the part to the small grooves on the inner wall until there are no burrs on the inner wall grooves. During the reciprocating reaming process, the part should be avoided from deformation and scratches on the inner wall.

[0014] After completing the above processing steps, the parts are ultrasonically cleaned, and an endoscope is used to check that there are no burrs at the grooves on the inner wall of the parts.

[0015] Furthermore, the tool specifications are as follows:

[0016]

[0017] Furthermore, the skeleton parts are made of titanium alloy, and cemented carbide is selected for the cutting tools.

[0018] Furthermore, titanium alloy skeleton parts are slender, thin-walled tubular parts, and the burrs on the grooves on the outer surface can be removed using traditional fitter techniques, such as scrapers and files.

[0019] For removing burrs from the inner wall of the pipe and the groove on the inner wall, the overall straightness of the tool should be controlled within Φ0.08, and the coaxiality of the front drill bit and the rear optical axis should be controlled within Φ0.05.

[0020] Furthermore, the method also includes:

[0021] After determining the tool specifications, material, and technical requirements, the tool is assembled. The front carbide drill bit and the rear stainless steel optical shaft are press-fitted together. HY-917 adhesive is added to the hole. After removing the excess adhesive, the tool is placed upright in an oven and cured at 120℃±2℃ for 4 hours. The assembled tool is then straightened to ensure that the overall straightness is no greater than Φ0.08. The front drill bit and the rear optical shaft are externally ground to ensure that the coaxiality is no greater than Φ0.05.

[0022] Furthermore, the tool for deburring the small grooves on the inner wall of titanium alloy skeleton parts has a split structure. The first tool body and the second tool body can be replaced according to the actual application to achieve rapid removal of burrs in different scenarios.

[0023] Furthermore, the speed of the bench drill is set to 400 r / min, and the distance between the drill chuck and the worktable is adjusted according to the length of the part.

[0024] Furthermore, the fitter holds the outer diameter of the part, including:

[0025] Mount the carbide drill bit on a bench drill press using a drill chuck. The fitter holds the outer circle of the part, ensuring that the angle between the tool and the part is 5° to 10°. Ream the small grooves on the inner wall of the part from both ends up and down until there are no burrs on the grooves. During the reciprocating reaming process, avoid deforming the part and scratching the inner wall.

[0026] Beneficial effects:

[0027] This invention solves the problem of removing fine grooves on the inner wall of titanium alloy skeleton parts that cannot be completely removed using traditional fitter machining methods. Key aspects of tool design include customizing tools to the appropriate specifications based on the part's hole diameter and length; selecting suitable tool materials based on the properties of titanium alloy; and specifying the technical requirements for tool machining based on the part's external dimensions. Key machining points include controlling the angle between the tool and the part, and reciprocating reaming of the fine grooves on the inner wall from both ends of the part, avoiding deformation and scratches on the inner wall during the reciprocating reaming process.

[0028] The surface finish of the inner hole groove of the part processed by the method of the present invention is good, the burrs are cleanly removed, and the product assembly and debugging performance is stable. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments of the present invention will be briefly introduced below.

[0030] Figure 1 This is a schematic diagram of a titanium alloy skeleton part;

[0031] Figure 2 This is a schematic diagram of the cutting tool's structure;

[0032] Figure 3 This is a schematic diagram of the tool's dimensions;

[0033] Figure 4 This is a schematic diagram of a cutting tool. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0035] The features and illustrative embodiments of various aspects of the present invention will now be described in detail. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the invention. However, it will be apparent to those skilled in the art that the invention can be practiced without some of these specific details. The following description of embodiments is merely intended to provide a better understanding of the invention by illustrating examples of the invention.

[0036] It should be noted that, unless otherwise specified, the embodiments of the present invention and the features thereof can be combined with each other, and the various embodiments can be referenced and cited in each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0037] refer to Figure 1 The part to be processed is a thin-walled part with a length-to-diameter ratio of 50:1 and a wall thickness of 0.5. A groove with a length of 33 mm needs to be cut at 8 mm on the outer diameter of the part, with a groove spacing of 26 mm and a groove width of 0.3 mm. The processing method for this titanium alloy skeleton part may include the following steps:

[0038] Step 1: Inspect the incoming materials to ensure that the straightness of the parts is no greater than Φ0.1. Wire-cut parts are cut into single pieces. When clamping, be careful not to damage the surface of the parts. After the parts are processed, place them upright in a special turnover box to prevent damage to the straightness of the parts.

[0039] Step 2: Remove burrs from both ends of the cut parts, check the straightness of the parts, and straighten parts that have undergone slight deformation after heat treatment to ensure that the straightness is not greater than Φ0.1.

[0040] Step 3: Clamp the outer diameter of the part with the spring collet, evenly flatten the allowance on both ends to ensure the total length of the part, clamp the outer diameter of the right end of the part, align the runout of the extended end of the outer diameter to be no greater than Φ0.01, machine the outer diameter of the right end of the part, turn it around, clamp the outer diameter of the left end of the part, align the runout of the extended end of the outer diameter to be no greater than Φ0.01, machine the outer diameter of the left end of the part.

[0041] Step 4: The laser cutting machine cuts 8 grooves with a width of 0.3 on the outer circle of the part, ensuring that the groove length is 33 and the groove spacing is 26.

[0042] The laser cutting machine has a laser power of 75W, a cooling water pressure of 0.4MPa, and an air pressure of 0.7MPa.

[0043] Step 5: Remove burrs from the inner wall of the thin-walled pipe and both sides of the groove, and repair the sharp edges inside and outside the groove.

[0044] Burrs on the outer circular surface grooves can be removed using traditional fitter's methods with tools such as scrapers and files. However, the removal of burrs on the inner wall of the hole and the inner wall grooves is limited by the part structure and cannot effectively remove burrs in the small grooves on the inner wall. Furthermore, the accumulation of burrs on the inner wall of the frame can cause the iron core connecting rod assembly to jam and change the magnetic properties of the iron core, which cannot meet the requirements of normal batch production and assembly debugging.

[0045] This invention provides a tool for deburring small grooves on the inner wall of titanium alloy skeleton parts. The tool is designed to meet the processing requirements by considering three aspects: tool specifications, tool material, and tool technical requirements.

[0046] In some embodiments, due to the inconsistent hole sizes of titanium alloy skeleton parts, after the first tooling body 1 and the second tooling body 2 are press-fitted (see reference). Figure 2-4 Since it cannot penetrate the inner hole of the skeleton, the burrs on the hole wall cannot be effectively removed. Therefore, its design process includes the following steps:

[0047] Step 1: Tool Selection. Based on the dimensions of the skeleton-type parts, design the tool specifications to cover all current products and avoid excessive variety in tool specifications (see reference). Figure 2 Pay special attention to determining the tool dimensions; the front drill bit length is 55, and the drill bit size is greater than the rear optical axis size.

[0048] Step Two: Regarding tool material selection, we analyze the differences between carbide drills and ordinary drills. The main difference lies in the materials. Ordinary drills are primarily made of high-speed steel (HSS), while carbide drills are made of cemented carbide. Compared to ordinary drills, carbide drills have better hardness and wear resistance. Considering the difficulties in machining titanium alloys, carbide drills are chosen as the tool material. Carbide drills are primarily made of cemented carbide, also known as cemented carbide tungsten-molybdenum-cobalt (WC-Co) alloy. Cemented carbide is a new type of material formed by high-temperature sintering of tungsten carbide, cobalt powder, and other materials, possessing extremely high hardness, wear resistance, and high-temperature strength. Compared to ordinary drill materials, carbide drills have better hardness and wear resistance, making them suitable for machining materials with high hardness and high brittleness.

[0049] Step 3: Regarding the technical requirements for the cutting tools, based on the dimensional characteristics of the parts, the skeleton-type parts are slender, thin-walled tubular parts with a length-to-diameter ratio of 50:1 and a wall thickness of 0.5. Based on the usage characteristics of the parts, the skeleton-type parts are used in differential transformer-type linear displacement sensors. During use, an iron core and connecting rod assembly is installed in the inner hole of the skeleton. The high-permeability iron core and connecting rod are connected and welded together via threads. The connecting rod drives the iron core to move axially relative to the LVDT within the skeleton, changing the electromagnetic parameters of the LVDT, causing the LVDT to generate a corresponding output voltage signal. Therefore, when machining the cutting tools, attention should be paid to the overall straightness and the coaxiality of the front drill bit and the rear optical axis. Through actual verification, it is finally stipulated that the straightness of the cutting tool should be controlled within Φ0.08, and the coaxiality of the front drill bit and the rear optical axis should be controlled within Φ0.05.

[0050] Step 4: Select carbide drill bits of different specifications from the tool magazine, and machine a Φ1.5 (0+0.03) inner hole with a depth of 5mm on the rear end face of the drill bit;

[0051] Step 5: According to the hole diameter of the part, retrieve stainless steel bars from the material warehouse, process the bars to different specifications, and process a Φ1.5 (+0.04+0.05) stepped outer circle with a length of 5mm at one end of the outer circle;

[0052] Step 6: Press the carbide drill bit into the stainless steel bar, add HY-917 glue into the hole, remove the excess glue, and then place the tool upright in the oven to cure it at 120℃±2℃ for 4 hours.

[0053] Step 7: Straighten the assembled cutting tool to ensure that the overall straightness is no greater than Φ0.08, and externally grind the front drill bit and the rear optical axis to ensure that the coaxiality is no greater than Φ0.05.

[0054] In some embodiments, after the titanium alloy skeleton part and the end face part are assembled, the burrs on the end face of the deep hole need to be removed. However, the existing cutting tools cannot remove the burrs of this structural part. For the removal of burrs of this type of part, the deburring mode is adopted by replacing the front drill bit with a special scraper.

[0055] In some embodiments, to avoid scratches on the inner wall of the part and incomplete burr removal due to improper tool clamping method and fitter operation, the following processing method is specified:

[0056] refer to Figure 3 In some embodiments, a processing method for deburring fine grooves is provided, the steps of which are as follows:

[0057] Step 1: According to the part specifications, adjust the height of the drill chuck from the worktable and set the speed of the bench drill to 400 r / min;

[0058] Step 2: Mount the carbide drill bit onto the bench drill press using a drill chuck;

[0059] Step 3: The fitter holds the outer circle of the part, ensuring that the angle between the tool and the part is 5-10°.

[0060] Step 4: Since the part is a slender, thin-walled tube, it is necessary to reciprocate from both ends of the part to the inner wall of the small grooves until there are no burrs at the inner wall grooves. During the reciprocating ...

[0061] Step 5: Clean the parts with ultrasonic cleaning and inspect the inner wall grooves of the parts with an endoscope to ensure there are no burrs.

[0062] This invention solves the problem of removing fine grooves on the inner wall of titanium alloy skeleton parts that cannot be completely removed using traditional fitter machining methods. Key aspects of tool design include customizing tools to the appropriate specifications based on the part's hole diameter and length; selecting suitable tool materials based on the properties of titanium alloy; and specifying the technical requirements for tool machining based on the part's external dimensions. Key machining points include controlling the angle between the tool and the part, and reciprocating reaming of the fine grooves on the inner wall from both ends of the part, avoiding deformation and scratches on the inner wall during the reciprocating reaming process.

[0063] The method of this invention produces parts with good surface finish of inner hole grooves, clean burrs removal, and stable product assembly and debugging performance.

[0064] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the disclosure herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the following claims.

[0065] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

Claims

1. A tool design method for deburring small grooves, characterized in that, Includes the following steps: Set the specifications, materials, and technical requirements of the cutting tools used in the machining process; Regarding tool selection, tool specifications are designed for the dimensions of skeleton-type parts (TA18-G4×0.5, TA18-G4.5×0.5, TA18-G5×0.5, TA18-G6×0.5, TA18-G6.5×0.5, TA18-G7×0.5). Regarding the selection of tool materials, the tool materials were determined based on the difficulties in machining titanium alloy materials; Regarding the technical requirements for cutting tools, based on the appearance and dimensional characteristics of the parts and their usage characteristics, it is stipulated that when machining cutting tools, attention should be paid to two aspects: overall straightness and coaxiality between the front drill bit and the rear optical axis. Once the above three requirements are met, the first and second tooling bodies can be press-fitted to achieve the tool design for deburring the small grooves on the inner wall of skeleton-type parts.

2. A processing method for deburring fine grooves, characterized in that, The cutting tool designed using the method of claim 1, the method comprising: Mount the cutting tool onto the bench drill and set the speed of the bench drill and the distance between the drill chuck and the worktable during the machining process; The fitter holds the outer circle of the part and uses a cutting tool to reciprocate from both ends of the part to the small grooves on the inner wall until there are no burrs on the inner wall grooves. During the reciprocating reaming process, the part should be avoided from deformation and scratches on the inner wall. After completing the above processing steps, the parts are ultrasonically cleaned, and an endoscope is used to check that there are no burrs at the grooves on the inner wall of the parts.

3. The method according to claim 2, characterized in that, The tool specifications are as follows:

4. The method according to claim 2, characterized in that, The skeleton parts are made of titanium alloy, and cemented carbide is selected for the cutting tool material.

5. The method according to claim 2, characterized in that, Titanium alloy skeleton parts are slender, thin-walled tubular parts. The burrs on the grooves on the outer circular surface can be removed by traditional fitter methods using scrapers and files. For removing burrs from the inner wall of the pipe and the groove on the inner wall, the overall straightness of the tool should be controlled within Φ0.08, and the coaxiality of the front drill bit and the rear optical axis should be controlled within Φ0.

05.

6. The method according to claim 2, characterized in that, The method further includes: After determining the tool specifications, material, and technical requirements, the tool is assembled. The front carbide drill bit and the rear stainless steel optical shaft are press-fitted together. HY-917 adhesive is added to the hole. After removing the excess adhesive, the tool is placed upright in an oven and cured at 120℃±2℃ for 4 hours. The assembled tool is then straightened to ensure that the overall straightness is no greater than Φ0.

08. The front drill bit and the rear optical shaft are externally ground to ensure that the coaxiality is no greater than Φ0.

05.

7. The method according to claim 2, characterized in that, The tool for deburring the small grooves on the inner wall of titanium alloy skeleton parts has a split structure. The first tool body and the second tool body can be replaced according to the actual application to achieve rapid removal of burrs in different scenarios.

8. The method according to claim 2, characterized in that, The speed of the bench drill is set to 400 r / min, and the distance between the drill chuck and the worktable is adjusted according to the length of the part.

9. The method according to claim 2, characterized in that, The fitter holds the outer circumference of the part, including: Mount the carbide drill bit on a bench drill press using a drill chuck. The fitter holds the outer circle of the part, ensuring that the angle between the tool and the part is 5° to 10°. Ream the small grooves on the inner wall of the part from both ends up and down until there are no burrs on the grooves. During the reciprocating reaming process, avoid deforming the part and scratching the inner wall.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the method as described in any one of claims 2-9.

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