Low-cost angle section drill jig and design method and use method thereof

Abstract

The invention discloses a low-cost angle section drill jig and a design method and a use method thereof, and relates to the technical field of aircraft assembly process equipment.The design method comprises the following steps that S1, statistics is conducted according to the maximum outline structure feature size of angle section parts in batches, and the parts with the same outline feature are classified into one class; s2, performing hole site feature analysis on the similar parts in the step S1, and selecting q parts with specific common hole site features; and S3, according to the parts screened out in the step S2, a common drill jig base and a q-piece drill jig plate are designed, avoiding holes corresponding to all to-be-drilled hole sites of the q-piece parts are formed in the drill jig base, drilling hole sites corresponding to the q-piece parts are designed in the q-piece drill jig plate, the development cost of the angle section drill jig can be remarkably reduced, and the occupied storage area of a storeroom is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of aircraft assembly process equipment, and particularly relates to a low-cost angle section drill jig and its design method and usage method. Background Art

[0002] There are a large number of angle section connectors with the same maximum outer contour size, similar structures, and the same multiple hole positions between the internal frame beam structures of modern aircraft, which are used for the structural installation and connection of the fuel system and the avionics system. Along with the development of aircraft manufacturing technology and the improvement of process methods, before the angle section is connected to the above structures, self-aligning holes and guiding holes with higher precision need to be made first. The hole position accuracy of the traditional scribing and hole-making method cannot meet the requirements, and usually, an angle section drill jig needs to be used for hole-making work. Such a drill jig usually consists of two parts: a drill jig base and a drill template. Since the hole positions on the angle section are not completely the same, the traditional method is to use a corresponding special drill jig to drill self-aligning holes / guiding holes for each angle section, which has the following significant deficiencies: ① High manufacturing cost. Each set of drill jigs requires a dedicated drill jig structure design. Especially for the development of aircraft in the new research stage, due to improvements and modifications, the shape and hole-opening characteristics of the angle section will change for each flight. Using corresponding special drill jigs for the changed angle sections results in relatively high research and development cost expenditures.

[0003] ② Not conducive to storage and management. Facing a large number of special drill jigs, the storage space occupied in the warehouse significantly increases, which is not conducive to storage and management. Summary of the Invention

[0004] The purpose of the present invention is to provide a low-cost angle section drill jig and its design method and usage method, which can significantly reduce the research and development cost of the angle section drill jig and reduce the occupation of the storage area in the warehouse.

[0005] The present invention is achieved through the following technical solutions: A design method for a low-cost angle section drill jig includes the following steps: S1. Statistically analyze the maximum outer contour structure feature dimensions of a batch of angle section parts, and classify the parts with the same outer contour features into one category; S2. Analyze the hole position features of the parts in the same category in step S1, and select q parts with specific common hole position features; S3. According to the parts screened in step S2, design 1 common drill jig base and q drill templates. The drill jig base is provided with corresponding avoidance holes for all the holes to be drilled on the q parts, and the q drill templates are respectively designed with the holes to be drilled corresponding to the q parts.

[0006] Furthermore, in step S1, the angle section parts classified into the same category have the same length, width, height, and thickness.

[0007] Further, in step S2, the hole position feature analysis method is as follows: S2.1. Establish a rectangular coordinate system for n angle bar parts in the same category, and unify the origin O, X-axis, and Y-axis to the same coordinate system to obtain the correlation relationships of all hole centers and hole radii on the n angle bars; In this step, for one part, if i hole positions need to be drilled, then for any hole position, it is defined using a rectangular coordinate system on the angle bar part, denoted as: , where, a ni represents the x value of any hole, b ni represents the y value of any hole, R ni represents the radius of any hole; For any two holes inj and ink on this angle bar part, the center distance L between the two holes satisfies the following formula (1), (1), In formula (1), j, k ∈ [1, i], j represents any hole on the angle bar part; k represents any hole on the angle bar part except the j hole, a nj represents the j value of the x hole in the rectangular coordinate system, a nk represents the k value of the x hole in the rectangular coordinate system, b nj represents the j value of the y hole in the rectangular coordinate system, b k represents the k value of the y hole in the rectangular coordinate system, and L represents the distance between the two holes; S2.2. Determine the hole center coordinates, conduct hole diameter size analysis, and remove the c1 angle bars corresponding to the holes that do not meet the following condition (2), leaving n - c1 parts, ( a nj , b nj ) = ( a nk , b nk ); R nj =R nk (2), Among them, R nj represents j the diameter of the hole, R nk represents k the diameter of the hole; S2.3. Analyze the hole center distances of the remaining n - c1 parts again. The hole center distances between any two holes ipj and ipk need to satisfy the following relational formula (3), (3), In formula (3), u = (R j + R k ) / 2; a j represents j the x value of the hole in the rectangular coordinate system; a k represents k the x value of the hole in the rectangular coordinate system; b j represents j the y value of the hole in the rectangular coordinate system; b k represents k the y value of the hole in the rectangular coordinate system, R j represents j the diameter of the hole, R k represents k the diameter of the hole; Classify the c2 pieces of angle bars corresponding to the holes that do not meet the conditions, and the remaining n - c1 - c2 pieces of angle bars.

[0008] The angle bar drill jig manufactured by using the design method described in any one of the foregoing.

[0009] Furthermore, the drill jig base is provided with a tightening screw I and a torsion spring for positioning and pressing the angle bar parts; it is also provided with a positioning pin and a tightening screw II for positioning and pressing the drill template; it is also provided with an anti - error pin and an elastic limit mechanism for physical anti - error of the drill template.

[0010] Furthermore, the diameter of the avoidance hole on the drill jig base is larger than the diameter of the corresponding drilled hole on the corresponding q parts.

[0011] Furthermore, the avoidance hole on the drill jig base needs to meet the requirements of structural stiffness and support strength during drilling in terms of structure.

[0012] Furthermore, stacking holes are provided on the non-top drill templates. If there are multiple drill templates, stacking holes are provided on all non-top drill templates; stacking pins are provided on the top drill template.

[0013] As the usage method of the angle bar drill jig described above, it includes the following steps: Ⅰ. When using the angle bar drill jig, remove the drill templates in the stacked state from the drill jig base, place the first angle bar part, position the angle bar part by tightening screw Ⅰ and the torsion spring, then place the drill template corresponding to the first angle bar part, and press it tightly by tightening screw Ⅱ to drill the corresponding opening of the first angle bar. Ⅱ. Loosen screw Ⅰ, remove the drill template and the first angle bar, then place the second angle bar, position the second angle bar by tightening screw Ⅰ and the torsion spring, place the drill template corresponding to the second angle bar part, and press it tightly by tightening screw Ⅱ to drill the corresponding opening of the second angle bar. Ⅲ. According to the above method, complete the drilling of the hole positions of q pieces of angle bars of the same type. Ⅳ. Loosen screw Ⅰ, remove the drill template corresponding to the qth angle bar part and the qth angle bar, and then stack and store the drill jig base and all q drill templates together through the stacking pins and stacking holes.

[0014] Compared with the prior art, the present invention has the following advantages and beneficial effects: First, in the present invention, a low-cost angle bar drill jig and its design method and usage method are proposed. Through this specific method, a batch of newly developed angle bar drill jigs can be quickly screened to obtain q drill jigs that meet the requirements of low-cost development. By combining the common drill jig base, anti-misalignment pins, and elastic limit mechanism of the angle bar drill jig, the q sets of drill jig structures for any q angle bars that meet the conditions are changed into 1 set of angle bar drill jigs. This 1 set of angle bar drill jigs includes 1 drill jig base and q drill templates. The stacking design of the drill templates makes the occupied area of the vertical projection change from the occupied area of n sets of angle bar drill jigs to the occupied area of 1 set of angle bar drill jigs, significantly saving the occupied area of the angle bar drill jig. At the same time, for the angle bar drill jig where the cost of the drill jig base accounts for about 85% and the cost of the drill template accounts for about 15%, adopting this solution, compared with the traditional drill jig design scheme, the cost of the angle bar drill jig is significantly reduced.

[0015] Second, in the present invention, a preferred low-cost design method of the angle bar drill jig is proposed. Through this method, the quick identification and quick design of the angle bar drill jig can be realized, and the research and development cost of the corresponding angle bar drill jig generated by the improvement and modification of the new aircraft development can be effectively reduced.

[0016] III. In the present invention, a preferred design method for a low-cost angle section drill jig is proposed. Different from the traditional mode of one-to-one correspondence between the angle section drill jig and the part, an analysis method for using a common drill jig base for angle section parts is proposed. Through this method, angle section parts of any batch can be quickly analyzed and classified, and angle section parts that meet the requirements for low-cost development of the drill jig can be quickly identified.

[0017] IV. In the present invention, a low-cost angle section drill jig with a preferred structure is proposed. By designing structures such as anti-misalignment pins and elastic limit mechanisms on the common drill jig base of the angle section drill jig, physical anti-misalignment of multiple drill templates is achieved when multiple angle section parts share one drill jig base. While ensuring the uniqueness and correctness of hole making for angle section parts, the development cost of the angle section drill jig is effectively reduced. Through the design of stacking pins and stacking holes, the stacking design of the angle section drill jig is realized, effectively reducing the floor area of the angle section drill jig in the non-tool state, which is of positive significance for the storage of the drill jig. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a diagram showing the relationship between the maximum outer contour structure feature size of the angle section part and local features.

[0019] Figure 2 is the basic structure diagram of the angle section drill jig that can be developed at low cost.

[0020] Figure 3 is the basic structure diagram of the angle section drill jig that can be developed at low cost.

[0021] Figure 4 is the basic state diagram of the drill jig base with the angle section part placed in it.

[0022] Figure 5 is the stacking state of the angle section drill jig.

[0023] Among them, 01, the first angle section part; 02, the second angle section part; 03, the third angle section part; 04, the fourth angle section part; 1, the drill jig base; 2, the first drill template; 3, the second drill template; 2.1, the anti-misalignment pin hole I; 3.1, the anti-misalignment pin hole II; 11, the tightening screw I; 12, the torsion spring; 13, the positioning pin; 14, the tightening screw II; 15, the anti-misalignment pin; 16, the elastic limit mechanism; 17, the stacking pin; 18, the stacking hole. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The present invention will be further described in detail below in conjunction with the embodiments, but the embodiments of the present invention are not limited thereto.

[0025] Embodiment 1 Taking a batch of angle section parts as an example, this embodiment further illustrates the present solution in conjunction with the accompanying drawings.

[0026] A low-cost design method for angle-section drilling jigs, comprising the following steps: Step S1: Statistically analyze the maximum outline structural feature dimensions of batch angle-section parts, and classify parts with the same outline features into one category.

[0027] Reference Figure 1 , the first angle-section part 01, the second angle-section part 02, the third angle-section part 03, and the fourth angle-section part 04 corresponding to the numbers 01, 02, 03, and 04 have the same outline features, that is, the maximum outline structural feature dimensions d, e, f, and t of the first angle-section part 01, the second angle-section part 02, the third angle-section part 03, and the fourth angle-section part 04 are the same, that is, they correspondingly have the same length, width, height, and thickness. Now, these four angle-section parts are classified into one category.

[0028] Step S2: Then, perform hole position feature analysis on the four parts of the same category in Step S1, and select q parts with specific common hole position features.

[0029] In this step, the hole position feature analysis method is as follows: S2.1: Establish a rectangular coordinate system for n angle-section parts in the same category, and unify the origin O, the X-axis, and the Y-axis to the same coordinate system to obtain the relevant relationships of all the hole centers and hole radii on the n angle-sections; In this step, for one part, if i hole positions need to be drilled, then for any hole position, it is defined using a rectangular coordinate system on the angle-section part, denoted as: , where, a ni represents the x value of any hole, b ni represents the y value of any hole, R ni represents the radius of any hole.

[0030] For any two holes inj and ink on this angle-section part, the center distance L between the two holes satisfies the following formula (1), (1), In formula (1), j , k ∈ [1, i], j represents any hole on the angle-section part; k represents any hole on the angle-section part except the j hole, a nj represents the j value of the x hole in the rectangular coordinate system, ank Indicates in the rectangular coordinate system k value of the hole x value b nj Indicates in the rectangular coordinate system j value of the hole y value b k Indicates in the rectangular coordinate system k value of the hole, L represents the distance between two holes; y S2.2. Determine the hole center coordinates, perform hole diameter size analysis, and remove any one of the two angle steels corresponding to the holes that do not meet the following condition (2), leaving n - c1 parts, S2.2, Determine the hole center coordinates, conduct hole diameter size analysis, and remove any one of the two angle steels corresponding to the holes that do not satisfy the following condition (2), leaving n - c1 parts, ( a nj , b nj ) = ( a nk , b nk ); R nj = R nk (2), wherein, R nj indicates j the diameter of the hole, R nk indicates k the diameter of the hole; S2.3. Perform hole center distance analysis on the remaining n - c1 parts. The hole center distance between any two holes ipj and ipk needs to satisfy the following relational expression (3), (3), In formula (3), u = (R j + R k ) / 2; a j Indicates in the rectangular coordinate system j value of the hole x value a k Indicates in the rectangular coordinate system k value of the hole x value b j Indicates in the rectangular coordinate system j value of the hole y value b k Indicates in the rectangular coordinate system k value of the hole y value, R j indicates jDiameter of the hole, R k Indicates k Diameter of the hole; Arbitrarily remove one of the two angle members corresponding to the holes that do not meet the conditions, leaving n - c1 - c2 angle members.

[0031] After screening, remove the first angle member part 01 and the third angle member part 03 numbered 01 and 03, and leave the second angle member part 02 and the fourth angle member part 04 numbered 02 and 04.

[0032] Step S3: According to the two parts screened out in step S2, refer to Figure 2 , design 1 common drill jig base 1 and two drill templates corresponding to the two parts of the second angle member part 02 and the fourth angle member part 04. Among them, the second angle member part 02 corresponds to the first drill template 2, and the fourth angle member part 04 corresponds to the second drill template 3. The drill jig base 1 is provided with corresponding avoidance holes for all the holes to be drilled on the two angle member parts. The two drill templates are respectively designed with the holes to be drilled corresponding to the two angle member parts. Refer to Figure 1 , where the holes numbered i21, i22, i23, i24, i25 on the second angle member part 02 and the holes numbered i41, i42, i43, i44, i45 on the fourth angle member part 04 are all holes to be drilled.

[0033] Among them, the first drill template 2 contains all the hole positions corresponding to the holes numbered i21, i22, i23, i24, i25 on the second angle member part 02, and the second drill template 3 contains all the hole positions corresponding to the holes numbered i41, i42, i43, i44, i45 on the fourth angle member part 04. The positions of the avoidance holes correspond to the hole positions on the first drill template 2 and the second drill template 3, and the diameter of the avoidance holes is larger than the diameter of the holes to be drilled. Moreover, the avoidance holes on the drill jig base 1 meet the requirements of structural stiffness and support during drilling in terms of structure.

[0034] Furthermore, refer to Figure 3 , 4 , the drill jig base 1 is provided with tightening screws Ⅰ11 and torsion springs 12 for positioning and pressing the angle member parts; it is also provided with positioning pins 13 and tightening screws Ⅱ14 for positioning and pressing the drill templates; it is also provided with anti - error pins 15 and elastic limiting mechanisms 16 for physical anti - error of the drill templates.

[0035] After placing the second angle member part 02 or the fourth angle member part 04 on the drill jig base 1, position it through the torsion spring 12. After positioning the first drill template 2 or the second drill template 3 through the positioning pin 13, then tighten it with the tightening screw Ⅱ14 to achieve the positioning and installation of the first drill template 2 or the second drill template 3 with the corresponding second angle member part 02 or the fourth angle member part 04.

[0036] When the second angle member part 02 or the fourth angle member part 04 is placed on the drill jig base 1, due to the restriction of the elastic limit mechanism 16 on the anti-misalignment pin 15, the anti-misalignment pin 15 will closely adhere to the edge of the second angle member part 02 or the fourth angle member part 04. When the corresponding first drill template 2 or the second drill template 3 is placed, there are anti-misalignment pin openings Ⅰ 2.1 or anti-misalignment pin openings Ⅱ 3.1 at corresponding positions on the corresponding drill template, through which the anti-misalignment pin 15 can pass. When the placed drill template is not the drill template corresponding to the second angle member part 02 or the fourth angle member part 04, the anti-misalignment pin 15 is misaligned with the opening, and the drill template cannot be placed, realizing physical anti-misalignment of the corresponding drill template.

[0037] The aperture of the relief hole on the drill jig base 1 is larger than the aperture of the corresponding drilled hole on the corresponding q-piece part.

[0038] In the present invention, stacking holes 18 are provided on the non-top drill templates. If there are multiple drill templates, stacking holes 18 are provided on all non-top drill templates; stacking pins 17 are provided on the top drill template. Refer to Figure 2 , on the top second drill template 3, stacking pins 17 are provided, and stacking holes 18 are formed on the non-top first drill template 2. It is convenient to stack and store several drill templates of the same type, saving the occupied space when storing the angle member drill jig.

[0039] In this embodiment, the usage method of the angle member drill jig prepared above includes the following steps: Ⅰ. When using the angle member drill jig, remove the stacked drill templates from the drill jig base 1, place the first angle member part, position the angle member part by tightening the screw Ⅰ 11 and the torsion spring 12, then place the drill template corresponding to the first angle member part, and press it tightly by tightening the screw Ⅱ 14 to drill the corresponding opening of the first angle member. Refer to Figure 4 , Figure 4 shows the state diagram of the fourth angle member part 04 placed in the drill jig base 1. The torsion spring 12 clamps the right end face of the fourth angle member part 04, the left end face of the fourth angle member part 04 abuts against the drill jig base 1. After tightening the screw Ⅰ 11 to press the fourth angle member part 04 tightly, due to the restriction of the elastic limit mechanism 16 on the anti-misalignment pin 15, the anti-misalignment pin 15 will closely adhere to the part edge of the fourth angle member part 04, and this position corresponds to the anti-misalignment pin 15 opening on the corresponding drill template, realizing physical misalignment prevention of the drill template.

[0040] Ⅱ. Loosen the tightened screw Ⅰ 11, remove the drill template and the first angle member part, then place the second angle member part, position the second angle member part by tightening the screw Ⅰ 11 and the torsion spring 12, then place the drill template corresponding to the second angle member part, and press it tightly by tightening the screw Ⅱ 14 to drill the corresponding opening of the second angle member part. Ⅲ. According to the above method, complete the drilling of the hole positions of two angle members of the same type; Ⅳ. Loosen the tightening screw Ⅰ11, remove the drill template corresponding to the second angle bar part and the second angle bar part, and then stack and store the drill die base 1 and the two drill templates together through the stacking pins 17 and stacking holes 18.

[0041] Reference Figure 5 , Figure 5 shows the angle bar drill die in a stacked state after use. The drill template is matched with the drill die base 1 through the stacking pins 17 and stacking holes 18 on the drill template to realize the stacked storage of the drill die parts.

[0042] Through this method, a batch of newly developed angle bar drill dies can be quickly screened to obtain q drill dies that meet the requirements of low-cost development. And by the method of combining the common drill die base 1, anti-misalignment pins 15 and elastic limit mechanisms 16 of the angle bar drill die, the structure of any q angle bar parts that meet the conditions is changed from the traditional q sets of drill die structures to 1 set of angle bar drill dies. The angle bar drill die in the present invention includes 1 drill die base 1 and q drill templates, and the stacked design of the drill templates enables the occupied area of the vertical projection to be changed from the occupied area of n sets of angle bar drill dies to the occupied area of 1 set of angle bar drill dies, saving the floor area: (n - 1) / n%, where: n > 1. For the traditional angle bar drill die, the cost of its drill die base 1 accounts for about 85%, and the cost of the drill template accounts for about 15%. For n angle bars that meet the conditions, compared with the traditional drill die development plan, the cost of the angle bar drill die in this plan is significantly reduced: (0.85n - 0.85) / n%, where: n > 1.

[0043] Through this method, the rapid identification and rapid design of low-cost development of the angle bar drill die are realized, which has an obvious effect on saving the development cost of the angle bar drill die and can effectively reduce the corresponding angle bar drill die design cost generated by the development and improvement and modification of new aircraft.

[0044] The above is only a preferred embodiment of the present invention, and does not impose any form of limitation on the present invention. Any simple modification or equivalent change made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A low-cost angle material drilling jig design method, characterized in that: The steps include: S1. Count the maximum external structural feature dimensions of the angle parts in a batch and classify the parts with the same external features into one category; S2, analyzing the hole characteristics of the same type of parts in step S1, and selecting q parts with specific common hole characteristics; S3. According to the parts selected in step S2, a common drilling jig base and q drilling templates are designed. The drilling jig base is provided with corresponding avoidance holes for all the holes to be drilled for the q parts, and the q drilling templates are respectively designed with the drilling holes required for the corresponding q parts.

2. A low-cost angle material drilling jig design method according to claim 1, characterized in that: In step S1, the angle parts classified into the same category have the same length, width, height and thickness.

3. A low-cost angle material drilling jig design method according to claim 1, characterized in that: In step S2, the hole position feature analysis method is: S2.

1. Establish a rectangular coordinate system for n pieces of angle bar parts of the same type, and unify the origin O, X axis, and Y axis to the same coordinate system to obtain the correlation between the hole centers and hole radii of all the openings on the n pieces of angle bar parts; In this step, if a part needs to be drilled i For any hole position, the rectangular coordinate system is used to define it on the angle material part, which is recorded as: ， in, a ni Indicates any hole x value, b ni Indicates any hole y value, R ni represents the radius of any hole; For any two holes inj and ink on this angle bar, the distance L between the centers of the two holes satisfies the following formula (1): （1）， In formula (1), j , k ∈【1,i】, j Indicates any hole on an angle part; k Indicates that the angle parts are j Any hole outside the hole, a nj In the rectangular coordinate system j Hole x value, a nk In the rectangular coordinate system k Hole x value, b nj In the rectangular coordinate system j Hole y value, b k In the rectangular coordinate system k Hole y value, L represents the distance between the two holes; S2.

2. Determine the coordinates of the hole center, analyze the hole size, and remove the c1 pieces of angle material corresponding to the holes that do not meet the following condition (2). The remaining n-c1 parts are （ a nj ， b nj ）=（ a nk ， b nk ）； R nj = R nk （2）， in, R nj express j The diameter of the hole, R nk express k The diameter of the hole; S2.

3. Perform hole center distance analysis on the remaining n-c1 parts. The hole center distance between any two holes ipj and ipk must satisfy the following relationship (3): （3）， In formula (3), u = (R j +R k ) / 2; a j In the rectangular coordinate system j Hole x value; a k In the rectangular coordinate system k Hole x value; b j In the rectangular coordinate system j Hole y value; b k In the rectangular coordinate system k Hole y Value, R j express j Hole diameter, R k express k The diameter of the hole; The c2 pieces of angle materials corresponding to the holes that do not meet the conditions will be removed, leaving n-c1-c2 pieces of angle materials.

4. An angle material drilling template made by the design method as described in any one of claims 1 to 3.

5. The angle material drilling jig according to claim 4, characterized in that: The drilling template base (1) is provided with a tightening screw I (11) and a torsion spring (12) for positioning and pressing the angle material parts; it is also provided with a positioning pin (13) and a tightening screw II (14) for positioning and pressing the drilling template; it is also provided with an anti-error pin (15) and an elastic limiting mechanism (16) for physically preventing errors in the drilling template.

6. The angle material drilling jig according to claim 4, characterized in that: The diameter of the avoidance hole on the drilling jig base (1) is larger than the diameter of the corresponding drilled hole on the corresponding q parts.

7. The angle material drilling jig according to claim 4, characterized in that: The avoidance hole on the drilling template base (1) must structurally meet the structural rigidity requirements and the support strength requirements during drilling.

8. The angle material drilling jig according to claim 4, characterized in that: The non-top drilling template is provided with a stacking hole (18). If there are multiple drilling templates, all of the multiple non-top drilling templates are provided with a stacking hole (18); the top drilling template is provided with a stacking pin (17).

9. The angle material drilling jig according to claim 4, characterized in that: The drilling template corresponding to the angle material part is provided with all hole positions corresponding to the holes to be made on the angle material part.

10. The method for using the angle material drilling jig as claimed in claim 5, characterized in that: The steps include: Ⅰ. When the angle material drilling jig is used, the stacked drilling template is removed from the drilling jig base (1), and the first angle material part is placed therein. After the angle material part is positioned by tightening screws Ⅰ (11) and torsion springs (12), the drilling template corresponding to the first angle material part is placed therein, and the drilling template is tightened by tightening screws Ⅱ (14) to drill the corresponding opening of the first angle material. Ⅱ. Loosen the tightening screw Ⅰ (11), remove the drilling template and the first angle material, then put in the second angle material, position the second angle material by tightening the screw Ⅰ (11) and the torsion spring (12), put in the drilling template corresponding to the second angle material part, tighten it by tightening the screw Ⅱ (14), and drill the corresponding opening of the second angle material; III. According to the above method, complete the drilling of holes for q pieces of angle materials of the same type; IV. Loosen the tightening screw I (11), remove the drilling template corresponding to the qth angle bar and the qth angle bar, and then stack the drilling template base (1) and all the q drilling templates together through the stacking pins (17) and the stacking holes (18).

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