Ultrahigh-precision bolt hole machining tool for aero-engine parts

Abstract

The utility model discloses an ultra-high-precision bolt hole machining tool for aero-engine parts. The drill bit part is arranged at the front end of the cutter bar; the boring cutter part is arranged on the cutter bar and is positioned at the rear part of the drill bit part; the reamer part is arranged on the cutter bar and is positioned at the rear part of the boring cutter part; the inner cooling structure comprises a flow channel, a drill bit inner cooling part, a boring cutter inner cooling part and a reamer inner cooling part; the drill bit inner-cooling part is arranged on the drill bit part; the boring cutter inner cooling part is arranged on the boring cutter part; the reamer inner cooling part is arranged on the reamer part; the flow channel is arranged in the machining tool and used for circulating a cooling medium, the flow channel is connected with the drill bit inner cooling part, the boring cutter inner cooling part and the reamer inner cooling part, and flow channel outlets are formed in the drill bit inner cooling part, the boring cutter inner cooling part and the reamer inner cooling part. According to the utility model, the number of used hole machining tools is reduced, the machining efficiency is improved, and the hole machining precision is improved. Due to the fact that the tool does not need to be replaced in the machining process, the hole machining effect with higher efficiency and higher quality is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of ultra-high precision bolt hole processing, in particular to an ultra-high precision bolt hole processing tool for aircraft engine parts. Background Art

[0002] With the continuous advancement of the development level of domestic commercial aircraft engines, the precision requirements for bolt holes in key transmission parts are getting higher and higher. During the processing, not only the aperture size accuracy and roughness requirements of the bolt holes must be guaranteed, but also the position requirements must be guaranteed.

[0003] At present, the bolt hole size tolerance of some key transmission parts in fan and turbine parts is required to be less than 0.02mm and the position tolerance is less than Because the parts are made of difficult-to-process materials such as high-strength steel, titanium alloy, and high-temperature alloy, the processing is difficult and the pass rate is low, which is very challenging in the industry.

[0004] Traditional precision hole processing technology completes the processing of precision holes through traditional processing methods (such as drilling, milling, boring, reaming, etc.).

[0005] Traditional precision hole machining technology is completed in the following steps on a milling machine or multi-function machining center:

[0006] 1) Use a drill to process the bottom hole;

[0007] 2) Use a milling cutter to expand the hole (optional);

[0008] 3) Use a boring tool to further expand the hole and complete the position correction;

[0009] 4) Use a reamer to expand the hole for the last time to ensure the diameter size and roughness requirements;

[0010] 5) Finally, use a chamfering tool or a rounding tool to complete the chamfering of the hole.

[0011] Most precision holes can be processed according to the above process steps. However, during the development of aircraft engines, the following technical problems exist when processing according to the above process steps:

[0012] 1. The number of knives required to be purchased is large, which is inconvenient to manage;

[0013] Second, it occupies more tool positions in the machine tool, affecting the installation of other tools;

[0014] 3. Drills, milling cutters, boring cutters, reamers, etc. are used in the processing, and multiple tool changes are required. The tools are installed on different tool holders, and installation errors are introduced during tool changes. When the hole accuracy requirements reach a certain level, this error will cause the parts to be out of tolerance.

[0015] It can be seen that for ultra-high precision hole processing, continuing to use traditional precision hole processing technology will have certain risks. In order to reduce the risk of over-tolerance, new technology needs to be used for processing.

[0016] In view of this, the inventor of the present application has designed an ultra-high precision bolt hole machining tool for aircraft engine parts in order to overcome the above-mentioned technical problems. Utility Model Content

[0017] The technical problem to be solved by the utility model is to overcome the inconvenience of using multiple tools for processing in the prior art, and the need for multiple tool changes, the tools are installed on different tool holders, and tool changes are prone to processing errors. The utility model provides an ultra-high precision bolt hole processing tool for aircraft engine parts.

[0018] The utility model solves the above technical problems through the following technical solutions:

[0019] The utility model provides an ultra-high precision bolt hole machining tool for aircraft engine parts, which is characterized in that the machining tool comprises: a tool bar; a drill head, which is arranged at the front end of the tool bar; a boring tool part, which is arranged on the tool bar and located at the rear of the drill head; a reamer part, which is arranged on the tool bar and located at the rear of the boring tool part; an internal cooling structure, which comprises a flow channel, a drill internal cooling part, a boring tool internal cooling part and a reamer internal cooling part; the drill internal cooling part is arranged on the drill head; the boring tool internal cooling part is arranged on the boring tool part; the reamer internal cooling part is arranged on the reamer part; the flow channel is arranged inside the machining tool for circulating a cooling medium, the flow channel connects the drill internal cooling part, the boring tool internal cooling part and the reamer internal cooling part, and flow channel outlets are arranged in the drill internal cooling part, the boring tool internal cooling part and the reamer internal cooling part.

[0020] According to an embodiment of the present invention, the boring tool portion includes at least two boring tool heads, and each of the boring tool heads has a position difference along the axial direction.

[0021] According to an embodiment of the utility model, the machining tool further comprises a grinding brush portion, and the grinding brush portion is arranged on the tool rod and located at the rear of the reamer portion.

[0022] According to an embodiment of the utility model, the internal cooling structure also includes a grinding brush internal cooling part, and the grinding brush internal cooling part is arranged on the grinding brush part; the flow channel is connected to the grinding brush internal cooling part, and a flow channel outlet is arranged on the grinding brush internal cooling part.

[0023] According to an embodiment of the utility model, the machining tool further comprises a chamfering tool portion, and the chamfering tool portion is arranged on the tool rod and is located at the rear of the reamer portion.

[0024] According to an embodiment of the utility model, the internal cooling structure also includes a chamfering cutter internal cooling portion, which is arranged on the chamfering cutter portion; the flow channel is connected to the chamfering cutter internal cooling portion, and a flow channel outlet is arranged on the chamfering cutter internal cooling portion.

[0025] According to an embodiment of the utility model, the machining tool further comprises a tool handle, and the tool handle is arranged at the rear end of the tool rod.

[0026] According to an embodiment of the utility model, the drill head and / or the boring tool head are detachably connected to the tool rod.

[0027] According to an embodiment of the utility model, the grinding brush portion is detachably connected to the knife rod.

[0028] According to an embodiment of the utility model, the chamfering knife portion is detachably connected to the knife rod.

[0029] The positive and progressive effects of the utility model are:

[0030] The utility model of the ultra-high precision bolt hole machining tool for aviation engine parts has at least the following advantages:

[0031] The ultra-high precision bolt hole machining tool for aircraft engine parts of the utility model reduces the number of hole machining tools used, improves machining efficiency, improves hole machining accuracy, and opens up the idea of ​​applying compound hole machining tools. Since the machining process no longer requires tool change, a higher efficiency and better quality hole machining effect is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The above and other features, properties and advantages of the present invention will become more apparent through the following description in conjunction with the accompanying drawings and embodiments, in which the same reference numerals always represent the same features, wherein:

[0033] Figure 1 The utility model is a structural schematic diagram of an ultra-high precision bolt hole machining tool for aircraft engine parts.

[0034] Figure 2 It is a schematic diagram of the processing stages of the ultra-high precision bolt hole processing tool for aircraft engine parts of the utility model.

[0035] Figure 3 The utility model is a schematic diagram of the internal cooling structure of a tool for machining ultra-high precision bolt holes of aircraft engine parts.

Brief Description of the Drawings

[0037] Tool bar 100

[0038] Drill head 200

[0039] Boring tool department 300

[0040] Boring cutter head 310

[0041] First boring tool head 311

[0042] Second boring tool head 312

[0043] Reamer 400

[0044] Internal cooling structure 500

[0045] Runner 510

[0046] Abrasive brush 600

[0047] Chamfering knife 700

[0048] Handle 800

[0049] Drill bit internal cooling unit 900

[0050] Boring cutter internal cooling unit 1000

[0051] Reamer internal coolant 1100

[0052] Grinding brush inner cooling part 1200

[0053] Chamfering knife internal cooling unit 1300 DETAILED DESCRIPTION

[0054] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below with reference to the accompanying drawings.

[0055] Embodiments of the utility model will now be described in detail with reference to the accompanying drawings. Reference will now be made in detail to preferred embodiments of the utility model, examples of which are shown in the accompanying drawings. Wherever possible, the same reference numerals will be used in all drawings to represent the same or similar parts. In addition, although the terms used in the utility model are selected from well-known and commonly used terms, some of the terms mentioned in the utility model specification may be selected by the applicant at his or her discretion, and their detailed meanings are explained in the relevant parts of the description herein. In addition, it is required to understand the utility model not only by the actual terms used, but also by the meaning implied by each term.

[0056] like Figure 1 to Figure 3 As shown, the utility model discloses an ultra-high precision bolt hole machining tool for aircraft engine parts, comprising:

[0057] Tool bar 100;

[0058] A drill head 200, which is disposed at the front end of the shank 100;

[0059] The boring tool part 300 is arranged on the tool bar 100 and is located at the rear of the drill part 200;

[0060] A reamer part 400 , which is disposed on the shank 100 and is located at the rear of the boring part 300 ;

[0061] Internal cooling structure 500, the internal cooling structure 500 includes a flow channel 510, a drill internal cooling portion 900, a boring tool internal cooling portion 1000 and a reamer internal cooling portion 1100;

[0062] The drill bit inner cooling part 900 is arranged in the drill part 200; the boring tool inner cooling part 1000 is arranged in the boring tool part 300; the reamer inner cooling part 1100 is arranged in the reamer part 400; the flow channel 510 is arranged inside the processing tool for circulating the cooling medium, the flow channel 510 connects the drill bit inner cooling part 900, the boring tool inner cooling part 1000 and the reamer inner cooling part 1100, and the flow channel outlets are arranged in the drill bit inner cooling part 900, the boring tool inner cooling part 1000 and the reamer inner cooling part 1100.

[0063] Preferably, the flow channel inlet of the flow channel 510 is arranged at the rear end of the knife rod 100.

[0064] The tool bar 100 serves as the main body of the machining tool, and various tool heads for machining can be installed thereon.

[0065] The end of the drill head 200 is a drill bit, which can perform drilling processing on the surface of the workpiece to be processed.

[0066] The boring cutter part 300 has a boring cutter head 310 and can perform boring processing.

[0067] The reamer part 400 has a reamer bit and can perform reaming.

[0068] The inner cooling structure 500 can assist chip removal and tool cooling. The flow channel 510 of the inner cooling structure 500 is provided with outlets at the drill head 200 , the boring cutter 300 and the reamer 400 , and can direct the cooling medium to the drill head 200 , the boring cutter 300 and the reamer 400 .

[0069] The internal cooling structure 500 directs cooling media such as air, oil, and cutting fluid to the processing part through the flow channel 510 set inside the processing tool. This not only cools the processing tool and the workpiece, but also effectively washes away the chips to prevent the accumulation of chips that affect the processing accuracy and efficiency.

[0070] Preferably, the drill bit inner cooling part 900, the boring tool inner cooling part 1000 and the reamer inner cooling part 1100 are provided with flow blocking structures, and when cooling of a designated processing part is required, the flow blocking structures can be opened.

[0071] The ultra-high precision bolt hole processing tool of the utility model can realize the process of machining without changing the tool in the middle, thereby reducing the error caused by tool changing, saving the time used for tool changing, and reducing the occupancy rate of the tool magazine, thereby realizing high-quality and efficient manufacturing of ultra-high precision holes.

[0072] like Figure 1-2 As shown, the utility model discloses an ultra-high precision bolt hole machining tool for aircraft engine parts. The boring tool part 300 includes at least two boring tool heads 310, and each boring tool head 310 has a position difference along the axial direction.

[0073] Two or more boring tool heads 310 can perform two or more boring operations.

[0074] Figure 1-2 The boring tool part 300 shown has two boring tool heads 310: a first boring tool head 311 and a second boring tool head 312. There is a position difference q between the first boring tool head 311 and the second boring tool head 312 in the axial direction, and the position difference q enables the two boring tool heads 310 to perform two boring operations in succession.

[0075] like Figure 1-2 As shown, the utility model discloses an ultra-high precision bolt hole machining tool for aircraft engine parts, the machining tool further comprising a grinding brush portion 600 , which is arranged on the tool rod 100 and located at the rear of the reamer portion 400 .

[0076] The grinding brush is used to grind the inner surface of the hole to ensure the roughness requirements of the hole and improve the surface quality.

[0077] like Figure 3 As shown, the utility model discloses an ultra-high precision bolt hole processing tool for aircraft engine parts. The internal cooling structure 500 also includes a grinding brush internal cooling part 1200, and the grinding brush internal cooling part 1200 is arranged in the grinding brush part 600; the flow channel 510 is connected to the grinding brush internal cooling part 1200, and the flow channel outlet is arranged in the grinding brush internal cooling part 1200.

[0078] An outlet is provided in the grinding brush inner cooling portion 1200 , so that the cooling medium in the flow channel 510 can be directed toward the grinding brush portion 600 .

[0079] like Figure 1-2 As shown, the utility model discloses an ultra-high precision bolt hole machining tool for aircraft engine parts, the machining tool also includes a chamfering tool part 700, and the chamfering tool part 700 is arranged on the tool rod 100 and is located at the rear of the reamer part 400.

[0080] The chamfering blade 700 is used to perform chamfering or rounding operations, and can ensure the consistency of chamfering and hole position processing.

[0081] like Figure 3 As shown, the utility model discloses an ultra-high precision bolt hole processing tool for aircraft engine parts, the internal cooling structure 500 also includes a chamfering tool internal cooling part 1300, and the chamfering tool internal cooling part 1300 is arranged on the chamfering tool part 700; the flow channel 510 is connected to the chamfering tool internal cooling part 1300, and the flow channel outlet is arranged on the chamfering tool internal cooling part 1300.

[0082] An outlet is provided in the cooling portion 1300 inside the chamfering blade, so that the cooling medium in the flow channel 510 can be directed toward the chamfering blade portion 700 .

[0083] like Figure 1-2 As shown, the utility model discloses an ultra-high precision bolt hole machining tool for aircraft engine parts. The machining tool also includes a tool handle 800 , which is arranged at the rear end of the tool rod 100 .

[0084] The tool holder 800 can be connected to a spindle of a machining center, so as to mount and connect the machining tool to the machining center.

[0085] The utility model discloses an ultra-high precision bolt hole machining tool for aircraft engine parts. A drill part 200 and / or a boring part 300 are detachably connected to a tool rod 100.

[0086] The utility model discloses an ultra-high precision bolt hole machining tool for aircraft engine parts. A grinding brush part 600 is detachably connected to a tool rod 100.

[0087] The utility model discloses an ultra-high precision bolt hole machining tool for aircraft engine parts. A chamfering tool portion 700 is detachably connected to a tool rod 100.

[0088] Since the drill head 200, the boring tool 300, the grinding brush 600 and the chamfering tool 700 are all detachable, the ultra-high precision bolt hole processing tool for aircraft engine parts of the utility model can flexibly replace the drill head, the boring tool, the grinding brush and the chamfering tool to adapt to different processing requirements. After the detachable drill head 200, the boring tool 300, the grinding brush 600 and the chamfering tool 700 are damaged, only the damaged part needs to be replaced without replacing the entire processing tool, which can reduce maintenance costs.

[0089] Preferably, the drill bit inner cooling part 900, the boring tool inner cooling part 1000, the reamer inner cooling part 1100, the grinding brush inner cooling part 1200 and the chamfering tool inner cooling part 1300 are all provided with a flow blocking structure, and when cooling of a designated processing part is required, the flow blocking structure can be opened.

[0090] When in use, the ultra-high precision bolt hole machining tool for aircraft engine parts of the utility model is installed on a machining center, and the machining tool of the utility model is used to realize that there is no need to change the tool during the machining process, thereby reducing the error caused by tool change, saving the time used for tool change, and reducing the occupancy rate of the tool magazine. Preferably, the speed and feed at different stages of the tool machining process are controlled by NC code to achieve high-quality and efficient manufacturing of ultra-high precision holes.

[0091] Before machining ultra-high precision bolt holes for aircraft engine parts, first design an ultra-high precision bolt hole machining tool of appropriate size according to the size requirements of the machined hole (including hole diameter, hole depth, and chamfer size).

[0092] like Figure 2 As shown, the use and processing steps of a preferred embodiment of the ultra-high precision bolt hole processing tool for aircraft engine parts of the utility model are as follows:

[0093] Step 1: Drill holes on the surface of the workpiece to be processed. Figure 2 Middle A1 stage.

[0094] After the drilling process is completed in stage A1, a bottom hole is formed, and the diameter of the bottom hole is D1.

[0095] Step 2: Boring the hole. Figure 2 Middle A2 stage.

[0096] After the hole is bored in stage A2, the hole diameter is D3, thus completing the correction of the hole shape and position tolerance. Stage A2 includes two boring operations, which are completed by the first boring tool head 311 and the second boring tool head 312 respectively (it can also be changed to three or more times depending on the situation). The hole diameter after boring by the first boring tool head 311 is D2, and the hole diameter after boring by the second boring tool head 312 is D3. There is a position difference q between the first boring tool head 311 and the second boring tool head 312 in the axial direction.

[0097] Step 3: Ream and grind. Figure 2 Middle A3 stage.

[0098] After reaming and grinding in stage A3, the hole diameter is D4, reaching the final size required by the design drawing. This stage includes reaming and grinding, which respectively ensure the hole diameter and roughness requirements;

[0099] Step 4: Chamfering Figure 2 Middle A4 stage.

[0100] After the A4 stage, the chamfering or rounding operation is completed.

[0101] The internal cooling structure 500 of the ultra-high precision bolt hole machining tool for aircraft engine parts of the utility model can assist chip removal and tool cooling in stages A1 to A4, and the numerical control program is provided with independent feed and speed at each stage of the machining process.

[0102] For machine tools with online measurement functions, the tool can be retracted after the A1 stage is completed, and the position of the hole can be measured and compensated using the side head of the machine tool. After completing the above operations, proceed to the A1 to A4 stages.

[0103] The ultra-high precision bolt hole machining tool for aircraft engine parts of the utility model is a multifunctional composite tool, that is, a tool combines multiple functions and can complete multiple operations in the hole machining process. The machining tool of the utility model can realize the process of machining without changing the tool in the middle, reduce the error caused by tool change, save the time used for tool change, and reduce the occupancy rate of the tool magazine. Preferably, the rotation speed and feed of the machining tool at different stages in the machining process are controlled by NC code to achieve high-quality and efficient manufacturing of ultra-high precision holes.

[0104] Compared with the traditional precision hole processing technology, multiple tool changes are required from drilling the base hole to completing the hole processing. The ultra-high precision bolt hole processing tool for aircraft engine parts of the utility model is installed on the processing center, so that there is no need to change the tool during the processing.

[0105] Since only one machining tool is used in the machining process, the occupancy rate of the machine tool magazine is reduced, the number of tool settings is reduced, and the tool change time is saved; only one tool is used in the machining process, and there is no need to change the tool, which also reduces the error caused by the tool change and improves the machining accuracy; the ultra-high precision bolt hole machining tool for aircraft engine parts of the utility model covers the grinding process, improves the surface quality, also covers the chamfering processing, and ensures the consistency of the chamfering and hole position processing.

[0106] In summary, the ultra-high precision bolt hole machining tool for aircraft engine parts of the utility model reduces the number of hole machining tools used, improves machining efficiency, improves hole machining accuracy, and opens up the idea of ​​applying compound hole machining tools. Since the machining process no longer requires tool change, a higher efficiency and better quality hole machining effect is achieved.

[0107] Although the specific embodiments of the present invention are described above, those skilled in the art should understand that these are only examples, and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principle and essence of the present invention, but these changes and modifications fall within the protection scope of the present invention.

Claims

1. An ultra-high precision bolt hole machining tool for aircraft engine parts, characterized in that: The processing tool comprises: Tool bar; A drill head, the drill head being arranged at the front end of the cutter bar; A boring tool portion, the boring tool portion is arranged on the tool rod and is located at the rear of the drill head portion; A reamer part, the reamer part is arranged on the tool bar and is located at the rear of the boring tool part; An internal cooling structure, the internal cooling structure comprising a flow channel, a drill internal cooling portion, a boring cutter internal cooling portion and a reamer internal cooling portion; The drill bit inner cooling part is arranged in the drill part; the boring tool inner cooling part is arranged in the boring tool part; the reamer inner cooling part is arranged in the reamer part; the flow channel is arranged inside the machining tool for circulating cooling medium, the flow channel connects the drill bit inner cooling part, the boring tool inner cooling part and the reamer inner cooling part, and flow channel outlets are arranged in the drill bit inner cooling part, the boring tool inner cooling part and the reamer inner cooling part.

2. The ultra-high precision bolt hole machining tool for aircraft engine parts according to claim 1, characterized in that: The boring tool portion includes at least two boring tool heads, each of which has a position difference along the axial direction.

3. The ultra-high precision bolt hole machining tool for aircraft engine parts according to claim 1, characterized in that: The machining tool further comprises a grinding brush portion, which is arranged on the tool rod and located at the rear of the reamer portion.

4. The ultra-high precision bolt hole machining tool for aircraft engine parts according to claim 3, characterized in that: The inner cooling structure further includes a grinding brush inner cooling portion, which is arranged on the grinding brush portion; the flow channel is connected to the grinding brush inner cooling portion, and a flow channel outlet is arranged on the grinding brush inner cooling portion.

5. The ultra-high precision bolt hole machining tool for aircraft engine parts according to claim 1, characterized in that: The machining tool further comprises a chamfering tool portion, which is arranged on the tool rod and located at the rear of the reamer portion.

6. The ultra-high precision bolt hole machining tool for aircraft engine parts according to claim 5, characterized in that: The internal cooling structure further includes a chamfering cutter internal cooling portion, which is arranged on the chamfering cutter portion; the flow channel is connected to the chamfering cutter internal cooling portion, and a flow channel outlet is arranged on the chamfering cutter internal cooling portion.

7. The ultra-high precision bolt hole machining tool for aircraft engine parts according to claim 1, characterized in that: The machining tool also includes a tool handle, which is arranged at the rear end of the tool rod.

8. The ultra-high precision bolt hole machining tool for aircraft engine parts according to claim 1, characterized in that: The drill head and / or the boring tool head are detachably connected to the tool rod.

9. The ultra-high precision bolt hole machining tool for aircraft engine parts according to claim 3, characterized in that: The grinding brush portion is detachably connected to the knife rod.

10. The ultra-high precision bolt hole machining tool for aircraft engine parts according to claim 5, characterized in that: The chamfering knife portion is detachably connected to the knife rod.

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