Ceramic matrix composite product installation window hole connection hole drilling tool and method

Abstract

The application discloses a kind of ceramic matrix composite product installation window inner connecting hole's drilling tool and method, solve the position accuracy of connecting hole made by existing drilling method is poorer, hole position and the perpendicularity of component surface is not high, and it is easy to cause hole position damage and other technical problems.The drilling tool includes base, positioning assembly, drilling bushing and at least one reaming bushing;Positioning assembly includes a plurality of first positioning blocks, at least one second positioning block and at least one third positioning block;First positioning block is used to abut the side wall of the product to be processed;Second positioning block and third positioning block are two for a group for abutting in two adjacent installation windows of the product to be processed, and the abutting surface is respectively provided with a plurality of positioning holes;Drilling bushing is used to install in the positioning hole of second positioning block or third positioning block when processing bottom hole;Reaming bushing is used to install in the positioning hole of second positioning block or third positioning block and reaming bottom hole.The drilling precision of the drilling tool is higher.

Description

TECHNICAL FIELD

[0001] The application relates to a drilling tool and method for a connecting hole in a mounting window of a ceramic matrix composite product. BACKGROUND

[0002] As a new type of thermal structure / function integrated material with the advantages of metal materials, ceramic materials and carbon materials, the ceramic matrix composite material has the characteristics of high temperature resistance, low density, high specific strength, high specific modulus, oxidation resistance, ablation resistance, crack insensitivity and disaster damage resistance, and is widely used in the fields of aviation, aerospace, nuclear energy and photovoltaic. Among them, the connecting piece in the ceramic matrix composite product plays a key role in connecting the parts between the products and bearing stress, and is an important part of the ceramic matrix composite product.

[0003] At present, the composite parts and metal parts inside the ceramic matrix composite product are usually connected by connecting pieces such as screws, so connecting holes need to be prepared on the composite parts. However, since some connecting holes are located in the narrow space of the parts, for such connecting holes, the existing drilling method is to first paste the drawing with the same size as the connecting hole on the surface of the part after cutting, then use glass drill, diamond drill bit and other tools to process the bottom hole, and finally use diamond grinding rod to expand the hole to obtain the required size of the connecting hole. Although the method can obtain the required connecting hole, the position accuracy of the connecting hole is poor, and the perpendicularity of the hole position to the surface of the part is not high. In addition, when drilling the bottom hole and expanding the hole, the high strength characteristics of the ceramic matrix composite material are easy to cause damage to the hole position, so that the prepared connecting hole is difficult to meet the process requirements of the ceramic matrix composite product. SUMMARY

[0004] The purpose of the application is to solve the technical problems of the existing drilling method, such as poor position accuracy of the connecting hole, low perpendicularity of the hole position to the surface of the part, and easy damage to the hole position, and to provide a drilling tool and method for a connecting hole in a mounting window of a ceramic matrix composite product.

[0005] To achieve the above purpose, the technical solution provided by the application is:

[0006] A drilling tool for a connecting hole in a mounting window of a ceramic matrix composite product, characterized in that:

[0007] The drilling tool comprises a base, a positioning assembly, a drilling insert and at least one expanding insert.

[0008] The positioning assembly comprises a plurality of first positioning blocks, at least one second positioning block and at least one third positioning block.

[0009] The first positioning block is L-shaped structure, the horizontal part is installed on the base, the vertical part is used for abutting the side wall of the product to be processed; a plurality of first positioning blocks are used for being distributed on both sides of the product to be processed, and the vertical part of each first positioning block is matched with the profile of the abutting surface of the product to be processed;

[0010] The second positioning block and the third positioning block form a positioning unit in pairs, the lower ends of the second positioning block and the third positioning block in each positioning unit are installed on the base, and a first positioning block is installed between the two; the upper ends of the second positioning block and the third positioning block in each positioning unit respectively extend into two adjacent installation windows of the product to be processed, and respectively abut the inner side walls of the two installation windows close to each other; a plurality of positioning holes are respectively arranged on the abutting surfaces of the second positioning block and the third positioning block and the installation window, and the positions and the number of the positioning holes are matched with the connecting hole to be processed;

[0011] The hole making sleeve is a hollow cylindrical structure, which is installed in the positioning hole of the second positioning block or the third positioning block when the bottom hole is processed; the outer diameter of the hole making sleeve is matched with the inner diameter of the positioning hole, and the inner diameter is matched with the bottom hole diameter of the connecting hole to be processed;

[0012] The hole expanding sleeve is a hollow cylindrical structure, which is installed in the positioning hole of the second positioning block or the third positioning block and expands the bottom hole; the outer diameter of each hole expanding sleeve is matched with the inner diameter of the positioning hole, and the inner diameters are different.

[0013] Further, the positioning assembly further comprises at least one pressing assembly;

[0014] The pressing assembly is a bridge structure, comprising a horizontal plate and two supports; the two supports are respectively installed on the base, and the height is matched with the height of the lower end surface of the installation window; the horizontal plate crosses the installation window of the product to be processed and is connected with the upper part of the two supports at both ends, and is used for pressing and positioning the installation window of the product to be processed.

[0015] Further, a plurality of sliding guide rails are installed on the base, the lower ends of the second positioning block and the third positioning block are connected with the base through the sliding guide rails and are fastened through screws.

[0016] Further, the abutting surfaces of the upper ends of the second positioning block and the third positioning block and the installation window are respectively provided with a convex rib, and the positioning hole is located in the convex rib.

[0017] Further, the base is provided with a positioning groove in the length direction, which is matched with the bottom width of the product to be processed.

[0018] Meanwhile, the application also provides a method for manufacturing a connecting hole in a mounting window of a ceramic matrix composite product, which adopts the manufacturing tool for the connecting hole in the mounting window of the ceramic matrix composite product, and comprises the following steps:

[0019] Step 1: placing the prepared product to be processed on the base and positioning the sidewall of the product by the first positioning blocks;

[0020] Step 2: adjusting the second positioning blocks and the third positioning blocks according to the position of the mounting window of the product to be processed, so that the upper ends of the second positioning blocks and the third positioning blocks in each positioning unit abut against the inner sidewalls of the two mounting windows close to each other, and the positioning holes of the second positioning blocks and the third positioning blocks correspond to the positions of the connecting holes to be processed, and then fastening the lower ends of the second positioning blocks and the third positioning blocks to the base;

[0021] Step 3: installing the corresponding hole manufacturing bushing in the corresponding positioning hole according to the hole diameter of the connecting hole to be processed, and processing the bottom hole by the pneumatic grinder and the glass drill, and leaving a margin; the drill bit diameter of the glass drill is matched with the inner diameter of the hole manufacturing bushing;

[0022] Step 4: disassembling the hole manufacturing bushing, installing the corresponding hole expanding bushing according to the hole diameter of the connecting hole to be processed, and then expanding the bottom hole processed in step 3 by the pneumatic grinder and the diamond grinding rod, thereby completing the manufacturing of the connecting hole in the mounting window of the ceramic matrix composite product.

[0023] Further, step 4 specifically comprises:

[0024] 4.1: disassembling the hole manufacturing bushing, selecting the hole expanding bushing with the corresponding size from the prepared hole expanding bushings and installing the bushing in the corresponding positioning hole;

[0025] 4.2: expanding the bottom hole processed in step 3 by the pneumatic grinder and the diamond grinding rod with the corresponding size;

[0026] 4.3: checking whether the bottom hole expanded in step 4.2 meets the preset process requirements, if not, going to step 4.4, and if yes, completing the manufacturing of the connecting hole in the mounting window of the ceramic matrix composite product;

[0027] 4.4: replacing the hole expanding bushing with a larger size than the hole expanding bushing in step 4.1, and continuing the hole expanding operation according to the method of step 4.2 until the manufacturing of the connecting hole in the mounting window of the ceramic matrix composite product is completed.

[0028] Further, in step 4.3, the checking is performed by the go gauge and the stop gauge in sequence, specifically comprising:

[0029] The corresponding size of the gauge and the stop gauge are sequentially inserted into the bottom hole after the reaming, if the gauge cannot be inserted into the bottom hole, it means that the processing of the bottom hole does not meet the preset process requirements, if the gauge can be inserted and the stop gauge cannot be inserted, it means that the processing of the bottom hole meets the preset process requirements.

[0030] Further, step 【1】 further comprises the step of positioning the mounting window by the pressing assembly.

[0031] Further, in step 【2】, the adjusting of the corresponding second positioning block and third positioning block is achieved by adjusting the positions of the second positioning block and the third positioning block on the sliding guide rail.

[0032] Compared with the prior art, the present application has the following advantages:

[0033] 1. The hole drilling tool for the connecting hole in the mounting window of the ceramic-based composite product comprises a base, a positioning assembly, a hole drilling insert, and at least one reaming insert, wherein the positioning assembly comprises a plurality of first positioning blocks, at least one second positioning block, and at least one third positioning block, the first positioning blocks are used to position the side wall of the product to be processed, and the second positioning block and the third positioning block form a pair, which are used to position the mounting window, thereby ensuring the position accuracy of the connecting hole to be processed; at the same time, the hole drilling insert and the reaming insert are respectively inserted into the positioning hole of the second positioning block or the third positioning block during use, and the drill bit of the processing equipment can be inserted from one end of the corresponding insert and extended from the other end, thereby avoiding the damage to the hole position caused by direct drilling, and further ensuring the drilling accuracy.

[0034] 2. The positioning assembly further comprises at least one pressing assembly, which can fasten the product to be processed on the base from top to bottom, thereby ensuring the stability of the product to be processed during processing, and further improving the processing accuracy of the connecting hole.

[0035] 3. The present application further comprises a plurality of sliding guide rails mounted on the base, which can adjust the positions of the second positioning block and the third positioning block on the sliding guide rail, thereby realizing the adaptability of the second positioning block and the third positioning block to the corresponding mounting window, improving the assembly efficiency of the tool, and ensuring the processing quality and accuracy.

[0036] 4. The present application is provided with a convex rib on the abutting surface of the mounting window on the upper end of the second positioning block and the third positioning block, and the positioning hole is located in the convex rib, and the positioning hole is opposite to the connecting hole to be processed, which can further ensure the perpendicularity of the connecting hole to the surface of the product, thereby improving the connection effect between the product and other components.

[0037] 5. The hole drilling method for the connecting hole in the mounting window of the ceramic-based composite product provided by the present application is simple to operate and has high drilling accuracy and high yield. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 Structure diagram of the drilling tool for installing the connecting hole in the window of the ceramic matrix composite product Figure One .

[0039] Figure 2 Structure diagram of the drilling tool for installing the connecting hole in the window of the ceramic matrix composite product Figure Two .

[0040] Figure 3 Structure diagram of the ceramic matrix composite product

[0041] Figure 4 Structure diagram of the connecting structure between the second positioning block or the third positioning block and the base in the drilling tool for installing the connecting hole in the window of the ceramic matrix composite product

[0042] Figure 5 Structure diagram of the assembly between the drilling tool and the product to be processed for installing the connecting hole in the window of the ceramic matrix composite product Figure One .

[0043] Figure 6 Structure diagram of the assembly between the drilling tool and the product to be processed for installing the connecting hole in the window of the ceramic matrix composite product Figure Two .

[0044] The reference signs are as follows:

[0045] 1-base, 2-drilling bushing, 3-bore expanding bushing, 4-first positioning block, 5-second positioning block, 6-third positioning block, 7-product to be processed, 8-installation window, 9-positioning hole, 10-cross plate, 11-support, 12-sliding guide rail, 13-ridge, 14-positioning groove. DETAILED DESCRIPTION

[0046] In order to make the purpose, advantages and features of the present application clearer, the present application will be further described in detail below in combination with the drawings and specific embodiments. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present application and are not used to limit the protection scope of the present application.

[0047] As shown in Figure 1 and Figure 2 , the present embodiment provides a drilling tool for installing the connecting hole in the window of the ceramic matrix composite product, which comprises a base 1, a positioning assembly, a drilling bushing 2 and at least one bore expanding bushing 3.

[0048] As shown in Figure 3As shown, the product to be processed 7 is of irregular structure, and a plurality of mounting windows 8 are provided on the product to be processed 7. The tooling of the embodiment is used to realize punching in the mounting windows 8.

[0049] The positioning assembly comprises a plurality of first positioning blocks 4, at least one second positioning block 5, and at least one third positioning block 6.

[0050] The first positioning block 4 is of L-shaped structure, and the horizontal part is mounted on the base 1, and the vertical part is used to abut against the side wall of the product to be processed 7. In use, a plurality of first positioning blocks 4 are distributed on both sides of the product to be processed 7, and the vertical part of each first positioning block 4 is adapted to the profile of the abutment surface of the product to be processed 7 and is in close contact.

[0051] The second positioning block 5 and the third positioning block 6 form a positioning unit as a pair, and the lower ends of the second positioning block 5 and the third positioning block 6 in each positioning unit are mounted on the base 1, and a first positioning block 4 is mounted between the two. The upper ends of the second positioning block 5 and the third positioning block 6 in each positioning unit respectively extend into two adjacent mounting windows 8 of the product to be processed 7, and respectively abut against the inner side walls of the two mounting windows 8 which are close to each other. A plurality of positioning holes 9 (through holes) are respectively provided on the abutment surfaces of each second positioning block 5 and third positioning block 6 and the mounting windows 8, and the positions and numbers of the positioning holes 9 are adapted to the positions and numbers of the connecting holes to be processed, as shown in Figure 4 .

[0052] In combination with Figure 5 and Figure 6 As shown, the hole-making bushing 2 is of hollow cylindrical structure, and is used to be mounted in the positioning hole 9 of the second positioning block 5 or the third positioning block 6 when processing the bottom hole; the outer diameter of the hole-making bushing 2 is adapted to the inner diameter of the positioning hole 9, and the inner diameter is adapted to the bottom hole diameter of the connecting hole to be processed.

[0053] The hole-expanding bushing 3 is of hollow cylindrical structure, and is used to be mounted in the positioning hole 9 of the second positioning block 5 or the third positioning block 6 and to expand the bottom hole. The outer diameter of each hole-expanding bushing 3 is adapted to the inner diameter of the positioning hole 9, and the inner diameter of each hole-expanding bushing 3 is different, and the specific size can be selected according to the diameter requirement of the connecting hole.

[0054] In order to ensure the perpendicularity of the connecting hole to be processed, the embodiment is provided with a convex rib 13 on the abutment surface of the upper end of each second positioning block 5 and third positioning block 6 and the mounting window 8, and the positioning hole 9 is located in the convex rib 13, thereby improving the positioning accuracy of the hole-making bushing 2 and the hole-expanding bushing 3 and further improving the hole-making precision.

[0055] In order to improve the machining precision, the positioning assembly of the embodiment further comprises at least one pressing assembly, the pressing assembly is a bridge type structure, comprising a horizontal plate 10 and two supports 11, the two supports 11 are respectively installed on the base 1, and the height is matched with the height of the lower end surface of the corresponding installation window 8 (i.e. the height of the window sill of the lower part of the installation window 8); the horizontal plate 10 spans the installation window 8 of the product to be machined 7 and is connected to the upper part of the two supports 11 at both ends, for pressing and positioning the installation window 8 of the product to be machined 7.

[0056] In order to improve the adaptability and convenience of use of the tooling, the embodiment further comprises a plurality of sliding rails 12 installed on the base 1, the lower ends of the second positioning block 5 and the third positioning block 6 are respectively provided with sliding grooves matched with the sliding rails 12, the positions of the second positioning block 5 and the third positioning block 6 on the base 1 can be adjusted through the sliding grooves and the sliding rails 12, and after adjustment, the second positioning block 5 and the third positioning block 6 can be fastened to the base 1 by screws.

[0057] At the same time, a positioning groove 14 matched with the width of the bottom of the product to be machined 7 can be provided in the length direction of the base 1, the positioning groove 14 not only ensures the quick installation of the product to be machined 7, but also ensures the stability of the product to be machined 7 during machining.

[0058] In combination Figures 1 to 6 , the embodiment also provides a method for machining the connecting hole in the installation window of a ceramic matrix composite product, comprising the following steps:

[0059] Step 1: Place the prepared product to be machined 7 in the positioning groove 14 on the base 1, and use a plurality of first positioning blocks 4 to position the side walls of the product to be machined 7, so that the product to be machined 7 is tightly attached to the base 1 and the first positioning blocks 4 without gaps.

[0060] In order to ensure the stability of the product to be machined 7, the installation window 8 is pressed and positioned from top to bottom by the pressing assembly, that is, the horizontal plate 10 spans the corresponding installation window 8, and the two ends are connected to the upper end of the corresponding support 11, and then the horizontal plate 10 is fixed to the base 1 by screws.

[0061] After the product to be machined 7 is fixed, the surface thereof can also be repaired according to process requirements.

[0062] Step 【2】. According to the position of the installation window 8 of the product to be processed 7, the second positioning block 5 and the third positioning block 6 are placed on the sliding guide rail 12 on the base 1 in advance, and the positions of the corresponding second positioning block 5 and the third positioning block 6 on the sliding guide rail 12 are adjusted left and right, so that the upper ends of the second positioning block 5 and the third positioning block 6 in each set of positioning units respectively abut against the mutually close inner side walls of the two installation windows 8, and the positioning holes 9 on the second positioning block 5 and the third positioning block 6 correspond to the positions of the connecting holes to be processed, so as to ensure that the convex edges 13 of the second positioning block 5 and the third positioning block 6 are in close contact with the surfaces of the connecting holes to be processed in the installation window 8, and then the lower ends of the second positioning block 5 and the third positioning block 6 are fastened to the base 1 by using an internal hexagonal screw.

[0063] Step 【3】. According to the hole diameter requirement of the connecting hole to be processed, the corresponding hole-making bushing 2 is installed in the corresponding positioning hole 9, and a bottom hole is drilled and milled by using a pneumatic sander and a glass drill, and a single-sided 1-2mm allowance is left respectively. In this embodiment, the diameter of the drill bit of the glass drill is matched with the inner diameter of the hole-making bushing 2, and also matched with the hole diameter of the bottom hole, the drill bit extends into one end of the hole-making bushing 2 and extends out of the other end, so as to penetrate through the corresponding installation window 8, and the preparation of the bottom hole is completed.

[0064] Step 【4】. The hole-making bushing 2 is disassembled, and the corresponding hole-expanding bushing 3 is installed according to the hole diameter requirement of the connecting hole to be processed, and then the bottom hole drilled and milled in step 【3】 is expanded by using a pneumatic sander and a diamond grinding rod, so as to complete the preparation of the connecting hole in the installation window of the ceramic matrix composite product. Specifically:

[0065] 4.1. The hole-making bushing 2 is disassembled, and the hole-expanding bushing 3 of the corresponding size is selected from the pre-prepared hole-expanding bushing 3 and installed in the corresponding positioning hole 9. In this step, the hole-expanding bushing 3 with a smaller inner hole diameter is preferentially selected to ensure the processing accuracy.

[0066] 4.2. The bottom hole drilled and milled in step 【3】 is expanded by using a pneumatic sander and a diamond grinding rod of the corresponding size. At this time, the diameter of the diamond grinding rod is matched with the inner diameter of the hole-expanding bushing 3 in step 4.1.

[0067] 4.3. Whether the bottom hole expanded in step 4.2 meets the preset process requirement is checked. If not, step 4.4 is entered, and if yes, the preparation of the connecting hole in the installation window of the ceramic matrix composite product is completed.

[0068] The inspection of the embodiment is sequentially performed by using the go gauge and the stop gauge, specifically, the go gauge and the stop gauge with corresponding sizes are sequentially inserted into the bottom hole after the reaming, generally, the diameter of the stop gauge is larger than that of the go gauge, if the go gauge cannot be inserted into the bottom hole, it represents that the processing of the bottom hole does not meet the preset process requirement, and the processing is continuously performed in the mode of step 4.4, if the go gauge can be inserted and the stop gauge cannot be inserted, it represents that the processing of the bottom hole meets the preset process requirement, so that the preparation of the connecting hole is completed.

[0069] 4.4, the reaming bushing 3 is replaced by a reaming bushing 3 with a larger size than the reaming bushing 3 in step 4.1, and the reaming operation is continuously performed in the mode of step 4.2 until the preparation of the connecting hole in the installation window of the ceramic matrix composite product is completed, it should be noted that the size of the corresponding diamond grinding rod is also replaced synchronously each time the reaming bushing 3 is replaced.

[0070] The application ensures the positioning accuracy by installing the ceramic matrix composite assembly (i.e. the product to be processed 7) on the base 1 and using the first positioning block 4 to install and position the ceramic matrix composite assembly, then the product to be processed 7 is fixed and clamped by using the clamping assembly, the second positioning block 5 and the third positioning block 6 are adjusted along the sliding guide rail 2 on the base 1 to ensure the accuracy of the position of the connecting hole, finally the hole drilling bushing 2 is installed, after the bottom hole is drilled and milled, the reaming bushing 3 is replaced to ream the bottom hole, and the size and accuracy of the connecting hole are ensured to meet the design requirements by inspecting the reaming once each time.

[0071] The application is especially suitable for the preparation of the connecting hole in a narrow space of a ceramic matrix composite product, and the operation is simple and the hole drilling accuracy and the yield are high.

[0072] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the application, but not to limit the application, although the application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can be modified, or some or all of the technical features can be replaced by equivalents, and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the application.

Claims

1. A drilling tool for drilling a connecting hole in a mounting window of a ceramic matrix composite product, characterized in that: it comprises a base (1), a positioning assembly, a drilling bushing (2) and at least one reaming bushing (3); the positioning assembly comprises a plurality of first positioning blocks (4), at least one second positioning block (5) and at least one third positioning block (6); the first positioning block (4) is of L-shaped structure, with the horizontal part mounted on the base (1) and the vertical part used for abutting against the side wall of the product (7) to be processed; a plurality of first positioning blocks (4) are distributed on both sides of the product (7) to be processed, and the vertical part of each first positioning block (4) is adapted to the profile of the abutting surface of the product (7) to be processed; the second positioning block (5) and the third positioning block (6) form a positioning unit as a pair, and the lower ends of the second positioning block (5) and the third positioning block (6) in each positioning unit are mounted on the base (1), with a first positioning block (4) mounted therebetween; the upper ends of the second positioning block (5) and the third positioning block (6) in each positioning unit extend into two adjacent mounting windows (8) of the product (7) to be processed, and abut against the inner side walls of the two mounting windows (8) close to each other; a plurality of positioning holes (9) are provided on the abutting surfaces of each second positioning block (5) and third positioning block (6) and the mounting window (8), and the positions and number of the positioning holes (9) are adapted to the connecting hole to be processed; the drilling bushing (2) is of hollow cylindrical structure, used for being mounted in the positioning hole (9) of the second positioning block (5) or the third positioning block (6) when drilling a bottom hole; the outer diameter of the drilling bushing (2) is adapted to the inner diameter of the positioning hole (9), and the inner diameter is adapted to the bottom hole diameter of the connecting hole to be processed; the reaming bushing (3) is of hollow cylindrical structure, used for being mounted in the positioning hole (9) of the second positioning block (5) or the third positioning block (6) and reaming the bottom hole; the outer diameter of each reaming bushing (3) is adapted to the inner diameter of the positioning hole (9), and the inner diameters are different.

2. The drilling tool for drilling a connecting hole in a mounting window of a ceramic matrix composite product according to claim 1, characterized in that: the positioning assembly further comprises at least one pressing assembly; the pressing assembly is of bridge-shaped structure, comprising a horizontal plate (10) and two supports (11); the two supports (11) are mounted on the base (1), and the two ends of the horizontal plate (10) are connected to the upper parts of the two supports (11), used for pressing and positioning the mounting window (8) of the product (7) to be processed.

3. The drilling tool for drilling a connecting hole in a mounting window of a ceramic matrix composite product according to claim 1 or 2, characterized in that: it further comprises a plurality of sliding rails (12) mounted on the base (1), and the lower ends of the second positioning block (5) and the third positioning block (6) are connected to the base (1) through the sliding rails (12) and fastened by screws.

4. The drilling tool for drilling a connecting hole in a mounting window of a ceramic matrix composite product according to claim 3, characterized in that: ​ ​ ​ ​ ​ ​ ​ ​ ​ The upper end of the second positioning block (5) and the third positioning block (6) is provided with a convex edge (13) respectively, and the positioning hole (9) is located in the convex edge (13).

5. The ceramic matrix composite product mounting window inner connecting hole drilling tool according to claim 4, wherein: The base (1) is provided with a positioning groove (14) in the length direction, which is matched with the bottom width of the product (7) to be processed.

6. A method of making a hole in a ceramic matrix composite product mounting window connection hole, characterized by, The ceramic matrix composite product mounting window inner connecting hole drilling tool according to any one of claims 1 to 5 comprises the following steps: Step 【1】: placing the prepared product (7) to be processed on the base (1) and positioning the side wall thereof by using a plurality of first positioning blocks (4); Step 【2】: adjusting the corresponding second positioning block (5) and the third positioning block (6) according to the position of the mounting window (8) of the product (7) to be processed, so that the upper end of the second positioning block (5) and the third positioning block (6) in each positioning unit respectively abuts against the inner side wall of the two mounting windows (8) close to each other, and the positioning hole (9) of the second positioning block (5) and the third positioning block (6) corresponds to the position of the connecting hole to be processed, and then the lower end of the second positioning block (5) and the third positioning block (6) is fastened to the base (1); Step 【3】: installing the corresponding drilling bushing (2) in the corresponding positioning hole (9) according to the hole diameter of the connecting hole to be processed, and processing the bottom hole by using a pneumatic sander and a glass drill, and leaving a margin; the drill bit diameter of the glass drill is matched with the inner diameter of the drilling bushing (2); Step 【4】: disassembling the drilling bushing (2), and installing the corresponding reaming bushing (3) according to the hole diameter of the connecting hole to be processed, and then reaming the bottom hole processed in step 【3】 by using a pneumatic sander and a diamond grinding rod, thereby completing the preparation of the ceramic matrix composite product mounting window inner connecting hole.

7. The method of making a hole in a ceramic matrix composite product mounting window inner joint hole according to claim 6, wherein, Step 【4】 is specifically: 4.1, disassembling the drilling bushing (2), selecting the corresponding size of the reaming bushing (3) from the prepared reaming bushing (3) and installing it into the corresponding positioning hole (9); 4.2, reaming the bottom hole processed in step 【3】 by using a pneumatic sander and a corresponding size of diamond grinding rod; 4.3, checking whether the bottom hole reamed in step 4.2 meets the preset process requirements, if not, going to step 4.4, if yes, completing the preparation of the ceramic matrix composite product mounting window inner connecting hole; 4.4, replacing the reaming bushing (3) with a larger size than the reaming bushing (3) in step 4.1, and continuing the reaming operation according to the method of step 4.2 until the preparation of the ceramic matrix composite product mounting window inner connecting hole is completed.

8. The ceramic matrix composite product mounting window inner connecting hole drilling method according to claim 7, wherein: In step 4.3, the checking is sequentially performed by using a go gauge and a stop gauge, which is specifically: The corresponding size of the gauge and stop gauge are sequentially inserted into the bottom hole after reaming, if the gauge cannot be inserted into the bottom hole, it represents that the processing of the bottom hole does not meet the preset process requirements, if the gauge can be inserted and the stop gauge cannot be inserted, it represents that the processing of the bottom hole meets the preset process requirements.

9. The method of claim 6, wherein the method further comprises: adjusting the second positioning block (5) and the third positioning block (6) by adjusting the position of the second positioning block (5) and the third positioning block (6) on the sliding guide rail (12). Step 【1】 further comprises the step of positioning the mounting window (8) by the pressing assembly.

10. The method of claim 6, wherein the method further comprises: adjusting the second positioning block (5) and the third positioning block (6) by adjusting the position of the second positioning block (5) and the third positioning block (6) on the sliding guide rail (12). In step 【2】, the adjustment of the corresponding second positioning block (5) and third positioning block (6) is achieved by adjusting the position of the second positioning block (5) and the third positioning block (6) on the sliding guide rail (12).

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