Profiling drill jig for drilling of composite material vehicle and positioning method

Abstract

The invention discloses a profiling drill jig and a positioning method.The profiling drill jig comprises an L-shaped profiling fixing base and a strip-shaped drill jig body, during installation, the L-shaped profiling fixing base is arranged on a boundary beam, so that a transverse installation part is attached to the bottom of the boundary beam, meanwhile, a vertical supporting part is attached to the outer side face of a side wall, and the strip-shaped drill jig body is installed on the L-shaped profiling fixing base; the L-shaped profiling fixing base is arranged on the transverse installation portion and the bottom of the edge beam in a penetrating mode through the first fastening piece so that the L-shaped profiling fixing base can be fixed, then the strip-shaped drilling jig is arranged on the drilling jig fixing groove, finally, the drilling jig is pressed on the side wall, and drilling operation can be conducted after the strip-shaped drilling jig is fixed. And the fixing stability of the strip-shaped drill jig can be effectively improved through the L-shaped profiling fixing base, and therefore the drilling precision is improved.

Description

Technical Field

[0001] The invention relates to the technical field of rail vehicles, and in particular to a profile drilling jig and a positioning method for making holes in a composite vehicle body. Background Art

[0002] When assembling the composite body of a rail vehicle, for example, when the side wall and the chassis of the vehicle body need to be connected, rivets are required. After the side wall and the chassis are assembled, it is necessary to rely on manual drilling to drill holes. The two layers of plates are drilled to a certain depth through the base hole one by one, and then the countersink drill bit is replaced with a depth setting device to prepare the countersink of the riveting hole. Since drilling is done manually, there are at least the following problems:

[0003] 1. Manual drilling is done on the vertical surface, which is not easy to meet the verticality requirements.

[0004] 2. The speed and feed rate of manual drilling are manually controlled. Under the condition of large-scale continuous operation, the consistency of hole making accuracy is not easy to ensure.

[0005] 3. After the through hole preparation is completed, the countersink drill bit needs to be replaced for secondary drilling. During manual operation, it is not easy to ensure the consistency of the two drillings.

[0006] 4. Since the inner cavity of the aluminum alloy side beam is a closed cavity, the cutting chips generated during the drilling process are not easy to be cleaned.

[0007] Therefore, how to improve the hole making accuracy of composite vehicle bodies is a technical problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0008] One object of the present invention is to provide a profiled drilling jig for composite material turning system holes, and another object is to provide a positioning method for composite material turning system holes, which can effectively improve the hole making accuracy.

[0009] To achieve the above object, the present invention provides the following technical solutions:

[0010] A profile drilling jig for making holes in a composite vehicle, comprising:

[0011] An L-shaped fixing seat comprises a transverse mounting portion and a vertical support fixing portion, wherein the transverse mounting portion is used to be connected to the bottom of the side beam through a first fastener, and a profiled support portion is provided on a side of the vertical support fixing portion facing the outer side surface of the side beam, wherein the profiled support portion is used to fit together with the outer side surface of the side beam, and a drilling template fixing groove is provided on the upper end of the vertical support fixing portion and on a side facing the side wall.

[0012] A strip drill template is provided with a plurality of drill tool fixing holes distributed along its length direction, the drill template fixing groove is used to accommodate the strip drill template, and the L-shaped fixing seat is used to press the strip drill template onto the side wall.

[0013] In some embodiments, a surface of the contoured support portion that faces the outer surface of the side beam is an arc-shaped convex surface.

[0014] In some embodiments, a groove is provided between the transverse mounting portion and the contoured support portion, and the groove is used to accommodate the outer eaves of the side beam extending obliquely downward.

[0015] In some embodiments, the imitation drill jig further includes a drill jig positioning pin, a base hole is provided on the side wall, and the drill jig positioning pin is used to position the strip drill jig on the side wall through the base hole.

[0016] In some embodiments, the drilling tool fixing hole is a countersunk hole, and the outer periphery of the drilling jig locating pin is provided with a step surface that cooperates with the countersunk hole.

[0017] In some embodiments, a positioning protrusion is provided at the head of the jig locating pin, and the positioning protrusion is used to be placed in the base hole. A pull rod is provided at the tail of the jig locating pin, and the pull rod is located outside the drilling tool fixing hole.

[0018] In some embodiments, a keyhole is provided at the bottom of the side beam, and a convex pressing block is provided at the upper end of the first fastener, and the convex pressing block is used to be inserted into the keyhole to fix the L-shaped fixing seat.

[0019] In some embodiments, a receiving groove for receiving the convex pressing block is provided on the upper surface of the transverse mounting portion, and a first connecting hole for the first fastener to pass through is also provided on the transverse mounting portion, and the first connecting hole and the receiving groove are connected to each other.

[0020] In some embodiments, a second connection hole extending in the horizontal direction is provided on the upper portion of the vertical support fixing portion, and the second connection hole is used for a second fastener to pass through, and the second fastener is used to press the strip drill template onto the side wall.

[0021] A positioning method for a hole in a composite material turning system, using any of the above-mentioned profiled drilling jigs for a hole in a composite material turning system, the positioning method comprises the following steps:

[0022] Fix the L-shaped fixing seat to the side beam so that the transverse mounting portion of the L-shaped fixing seat fits with the bottom of the side beam, and the vertical support fixing portion of the L-shaped fixing seat fits with the outer side surface of the side wall, and fix the transverse mounting portion to the bottom of the side beam by a first fastener;

[0023] Placing the strip drill template on the drill template fixing groove of the vertical support fixing portion, and pressing the strip drill template onto the side wall;

[0024] Insert the countersink integrated drill bits of the automatic feed drill into the drill tool fixing holes of the strip drilling template one by one to drill holes on the side beam and the side wall one by one.

[0025] Compared with the prior art, the above technical solution has the following advantages:

[0026] The present invention provides a profiling drill jig and positioning method for drilling holes in a composite vehicle. The profiling drill jig includes: an L-shaped profiling fixing seat and a strip drill jig. When installing, the L-shaped profiling fixing seat is placed on the side beam so that the transverse mounting portion fits with the bottom of the side beam, and the vertical support portion fits with the outer side of the side wall. Then, a first fastener is inserted through the transverse mounting portion and the bottom of the side beam to fix the L-shaped profiling fixing seat. Then, the strip drill jig is placed on the drill jig fixing groove. Finally, the drill jig is pressed against the side wall. After the strip drill jig is fixed, drilling can be performed. The L-shaped profiling fixing seat can effectively improve the fixing stability of the strip drill jig, thereby improving the drilling accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0028] Figure 1 A schematic diagram of a partial structure of a composite vehicle body provided by a specific embodiment of the present invention;

[0029] Figure 2 A schematic structural diagram of a profiled drilling jig for making holes in composite materials provided by a specific embodiment of the present invention;

[0030] Figure 3 It is a schematic diagram of the structure of the L-shaped fixing seat;

[0031] Figure 4 It is a structural schematic diagram of a strip drilling template;

[0032] Figure 5 It is a schematic diagram of the structure when the L-shaped fixing seat is placed on the side beam;

[0033] Figure 6 It is a schematic diagram of the structure when the L-shaped fixing seat is fixed on the side beam;

[0034] Figure 7It is a schematic diagram of the three-dimensional structure when the L-shaped fixing seat is fixed on the side beam;

[0035] Figure 8 It is a schematic diagram of the structure after the L-shaped fixing seat and the strip drilling template are assembled;

[0036] Fig. 9 It is a cross-sectional view of the strip drilling template when it is positioned on the side wall by the positioning pins;

[0037] Fig.10 It is a structural schematic diagram of an automatic feed drill when drilling a hole through a drill-counterface integrated drill bit;

[0038] Fig.11 This is a flow chart of the countersink drill bit when drilling;

[0039] Fig.12 It is a schematic diagram of the structure of a drill bit with integrated drilling and countersinking function.

[0040] The reference numerals are as follows:

[0041] 100-side beam;

[0042] 200-side wall, 201-base hole;

[0043] 10-L imitation fixing seat, 11-lateral mounting portion, 111-first connecting hole, 112-accommodating groove, 12-vertical supporting fixing portion, 121-imitation supporting portion, 122-drilling template fixing groove, 123-second connecting hole;

[0044] 20- bar drilling template, 21- drilling tool fixing hole;

[0045] 30-first fastener, 31-convex pressing block;

[0046] 40- second fastener;

[0047] 50-drilling jig locating pin, 51-locating protrusion, 52-pull rod. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0049] Please refer to Figures 1 to 12 .

[0050] The embodiment of the present invention provides a profiled drilling jig for making holes in a composite car body, comprising: an L-profiled fixing seat 10 and a strip-shaped drilling jig 20. The composite car body can be a car body used on a train, and includes a side beam 100 and a side wall 200. Figure 1 As shown, the lower end of the side wall 200 is located at the upper part of the outer side of the side beam 100, and the side wall 200 is provided with a base hole 201. The side beam 100 can be made of aluminum alloy. The inside of the side beam 100 forms a closed cavity. The side wall 200 can be made of carbon fiber composite material. The side wall 200 has a plurality of base holes 201 arranged in a straight line. For example, 478 6.6mm countersunk holes need to be prepared at the connection between the side wall 200 and the side beam 100, of which the countersunk hole spacing at the door frame is 57.15mm, and the countersunk hole spacing in other areas is 50mm. Figure 2 and Figure 3 As shown, the L-shaped fixing seat 10 is L-shaped, specifically including a horizontal mounting portion 11 and a vertical support fixing portion 12. The horizontal mounting portion 11 is used to be connected to the bottom of the side beam 100 through a first fastener 30. The vertical support fixing portion 12 is provided with a profiled support portion 121 on a side facing the outer side of the side beam 100. The profiled support portion 121 is used to fit the outer side of the side beam 100. The upper end of the vertical support fixing portion 12 and the side facing the side wall 200 are provided with a drilling template fixing groove 122. Figure 4 As shown, the strip drill template 20 is provided with a plurality of drill tool fixing holes 21 distributed along its length direction. The size and spacing of the drill tool fixing holes 21 can be selected according to the base holes 201 on the side wall 200. For example, a strip drill template 20 with a spacing can be prepared for the spacing of the base holes 201 at the door frame position, and a strip drill template 20 with another spacing can be prepared for the spacing of the base holes 201 at other regional positions. The drill template fixing groove 122 on the L-shaped fixing seat 10 is used to accommodate the strip drill template 20, and the L-shaped fixing seat 10 is used to press the strip drill template 20 against the side wall 200. During installation, the L-shaped fixing seat 10 is placed on the side beam 100 so that the horizontal mounting portion 11 fits with the bottom of the side beam 100, and the vertical support portion fits with the outer side of the side wall 200. Then, the first fastener 30 is inserted through the horizontal mounting portion 11 and the bottom of the side beam 100 to fix the L-shaped fixing seat 10. Then, the strip drill template 20 is placed on the drill template fixing groove 122, and finally, the drill template is pressed against the side wall 200. After the profiled drill template is fixed, the drilling operation can be performed. The profiled drill template can effectively improve the fixing stability of the strip drill template 20, thereby improving the drilling accuracy.

[0051] In some embodiments, Figure 3 , Figure 5 and Figure 6As shown, the side of the contoured support portion 121 facing the outer side of the side beam 100 is an arc-shaped raised surface, and the structure of the arc-shaped raised surface matches the outer side of the side beam 100. Therefore, the arc-shaped raised surface can improve the tightness of the fit with the outer side of the side beam 100, thereby ensuring the connection stability between the contoured support portion 121 and the side beam 100.

[0052] In some embodiments, Figure 3 , Figure 5 and Figure 6 As shown, a groove is provided between the transverse mounting portion 11 and the profiled support portion 121, wherein the groove is used to accommodate the outer eaves of the side beam 100 extending obliquely downward. That is, the inner side surface of the L-shaped fixing seat 10 is adapted to the structure of the bottom surface and the side surface of the side beam 100 to further improve the fixing stability of the L-shaped fixing seat 10. When installing, it can be pushed obliquely upward along the outer eaves so that the groove of the L-shaped fixing seat 10 is stuck in the outer eaves.

[0053] In some embodiments, Figure 8 As shown, the imitation drill jig also includes a drill jig positioning pin 50, and a base hole 201 is provided on the side wall 200, wherein a plurality of base holes 201 distributed along a straight line direction can be provided on the side wall 200, and the drill tool fixing holes 21 on the strip drill jig 20 correspond to the base holes 201 on the side wall 200 one by one. When positioning the strip drill jig 20, two of the base holes 201 can be selected for positioning, and a drill jig positioning pin 50 can be inserted into one of the drill tool fixing holes 21 on the strip drill jig 20, and at the same time, the head of the drill jig positioning pin 50 is inserted into the base hole 201 on the side wall 200, so that the strip drill jig 20 can be positioned on the side wall 200. The drill jig positioning pin 50 can effectively improve the positioning accuracy of the strip drill jig 20.

[0054] In some embodiments, the drilling tool fixing hole 21 is a countersunk hole, and the outer periphery of the drilling jig positioning pin 50 is provided with a stepped surface that cooperates with the countersunk hole, such as Fig. 9 As shown, the outer diameter of the left section on the outer circumference of the drill jig locating pin 50 is smaller than the outer diameter of the right section. The step surface can play an axial limiting role on the strip drill jig 20 to ensure the positioning stability of the strip drill jig 20.

[0055] In some embodiments, Fig. 9 As shown, the left end of the drill jig locating pin 50 is the head, and the right end is the tail. The head of the drill jig locating pin 50 is provided with a positioning protrusion 51. The outer diameter of the positioning protrusion 51 is adapted to the inner diameter of the base hole 201 on the side wall 200. The positioning protrusion 51 is used to be placed in the base hole 201 to position the strip drill jig 20. The tail of the drill jig locating pin 50 is provided with a pull rod 52. The pull rod 52 is located outside the drill tool fixing hole 21. The pull rod 52 is used to facilitate pulling out the drill jig locating pin 50.

[0056] In some embodiments, a keyhole is provided at the bottom of the side beam 100, and the keyhole is used to install a hanging part. In this embodiment, the keyhole can be used to fix the L-shaped fixing seat 10, wherein the upper end of the first fastener 30 is provided with a convex pressing block 31, and the convex pressing block 31 is used to be inserted into the keyhole to fix the L-shaped fixing seat 10. Figure 5 As shown, first place the L-shaped fixing seat 10 on the side beam 100 so that the convex pressing block 31 corresponds to the keyhole; Figure 6 As shown, the L-shaped fixing seat 10 and the side beam 100 can be fixed by inserting the convex pressing block 31 into the keyhole through the first fastener 30. After the drilling is completed, the first fastener 30 can be moved down to remove the convex pressing block 31 from the keyhole to release the fixing relationship between the L-shaped fixing seat 10 and the side beam 100.

[0057] In some embodiments, Figure 3 and Figure 5 As shown, the upper surface of the transverse mounting portion 11 is provided with a receiving groove 112 for receiving the convex pressing block 31. When the L-shaped fixing seat 10 is placed on the side beam 100, the upper surface of the convex pressing block 31 is not higher than the upper surface of the transverse mounting portion 11, so as to ensure that the upper surface of the transverse mounting portion 11 and the lower surface of the side beam 100 are closely fitted. The transverse mounting portion 11 is also provided with a first connecting hole 111 for the first fastener 30 to pass through. The first connecting hole 111 and the receiving groove 112 are interconnected. The first fastener 30 can be a bolt. In order to improve the stability of the connection, the transverse mounting portion 11 can be fixed to the bottom of the side beam 100 by two first fasteners 30.

[0058] In some embodiments, Figure 5 and Figure 6 As shown, the upper portion of the vertical support fixing portion 12 is provided with a second connecting hole 123 extending in the horizontal direction. When the strip drill jig 20 is positioned on the side wall 200 by the drill jig positioning pin 50, the second fastener 40 is passed through the second connecting hole 123. The second fastener 40 can press the strip drill jig 20 onto the side wall 200 through its axial force to improve the stability of the strip drill jig 20 when it is attached to the side wall 200.

[0059] An embodiment of the present invention further provides a positioning method for a hole in a composite material turning system. Using the profiled drilling jig for a hole in a composite material turning system provided by any of the above embodiments, the positioning method comprises the following steps:

[0060] Installation of the L-shaped fixing seat 10: The L-shaped fixing seat 10 is fixed to the side beam 100, so that the horizontal mounting portion 11 of the L-shaped fixing seat 10 is in contact with the bottom of the side beam 100, and the vertical support fixing portion 12 of the L-shaped fixing seat 10 is in contact with the outer side of the side wall 200, and the horizontal mounting portion 11 is fixed to the bottom of the side beam 100 by the first fastener 30. Two L-shaped fixing seats 10 can be fixed on the side beam 100.

[0061] Installation of the strip drill jig 20: Place the strip drill jig 20 on the drill jig fixing groove 122 of the vertical support fixing portion 12, and press the strip drill jig 20 against the side wall 200. One end of the strip drill jig 20 can be fixed by one of the L-shaped fixing seats 10, and the other end can be fixed by another L-shaped fixing seat 10. Before fixing, the strip drill jig 20 can be positioned by two drill jig positioning pins 50, and then the strip drill jig 20 can be pressed against the side wall 200 by the second fastener 40.

[0062] Hole making and countersinking: insert the drill bits of the automatic feed drill into the drill fixing holes 21 of the bar drill template 20 one by one to drill holes on the side beam 100 and the side wall 200 one by one. The expansion clamping function of the automatic feed drill can be used to fix it in the drill fixing hole 21, and the automatic feed function can be used to complete the through hole processing and countersinking processing at one time, which can effectively ensure the drilling quality. Fig.10 and Fig.11 As shown, since the countersink integrated drill bit of the automatic feed drill is used for drilling, the automatic cleaning drilling function can be utilized to clean the drill cuttings while making the hole, preventing the drill cuttings from entering the closed cavity in the side beam 100.

[0063] Parameter design and description of countersink drill bit: Fig.11As shown, the drill bit is a solid carbide drill and countersink integrated tool with specifications of D6.6×15×100°×D14×75×D10. The structure to be drilled is a structure with a carbon fiber composite side wall on the upper layer and an aluminum alloy side beam on the lower layer. The carbon fiber composite side wall has a base hole with a diameter of 5.5mm. During the hole making process, the riveting hole is prepared mainly by drilling and cutting a little and expanding the hole to 6.6mm; the lower plate has no base hole and is drilled to 6.6mm. After drilling, a 100° countersink (also called countersink) is drilled on the upper plate. When preparing through holes, the drilling of aluminum alloy materials is the main method, and the drilling of carbon fiber materials is auxiliary. Therefore, when setting the vertex angle, priority is given to drilling aluminum alloy metal materials. The surface hardening degree is high, the cutting temperature is high, and the tool is surrounded by the hole wall of the metal material. Selecting a larger vertex angle can improve the heat dissipation conditions and reduce the thermal damage of the composite material. At the same time, a larger vertex angle can also increase the strength of the drill bit and the cutting edge. Considering the small amount of drilling distribution requirements of the composite material, the vertex angle is set to 125°. The helix angle setting takes into account that during the hole making process, the cut material is pushed to the spiral surface of the drill bit and pulled up along the spiral surface. This behavior generates an upward peeling force, and the larger the helix angle, the greater the peeling force, which can offset part of the axial force generated during drilling. Excessive helix angles will cause entrance peeling and delamination, so the helix angle is set to 30°.

[0064] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0065] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0066] The above is a detailed introduction to a profiled drilling jig and positioning method for composite material turning hole provided by the present invention. This article uses specific examples to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the core idea of ​​the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A profile drilling jig for drilling holes in composite materials, characterized in that: include: An L-shaped fixing seat (10), the L-shaped fixing seat (10) comprising a transverse mounting portion (11) and a vertical support fixing portion (12), the transverse mounting portion (11) being used to be connected to the bottom of the side beam (100) via a first fastener (30), a profiled support portion (121) being provided on a side of the vertical support fixing portion (12) facing the outer side of the side beam (100), the profiled support portion (121) being used to fit together with the outer side of the side beam (100), and a drilling template fixing groove (122) being provided on an upper end of the vertical support fixing portion (12) and facing the side wall (200); A strip drill template (20), wherein the strip drill template (20) is provided with a plurality of drill tool fixing holes (21) distributed along its length direction, the drill template fixing groove (122) is used to accommodate the strip drill template (20), and the L-shaped fixing seat (10) is used to press the strip drill template (20) onto the side wall (200).

2. The profiled drilling jig for making holes in composite materials according to claim 1, characterized in that: A surface of the contoured support portion (121) facing the outer side surface of the side beam (100) is an arc-shaped convex surface.

3. The profiled drilling jig for making holes in composite materials according to claim 2, characterized in that: A groove is provided between the transverse mounting portion (11) and the contoured support portion (121), the groove being used to accommodate the outer edge of the side beam (100) extending obliquely downward.

4. The profiled drilling jig for making holes in composite materials according to claim 1, characterized in that: The imitation drilling jig further comprises a drilling jig positioning pin (50), a plurality of base holes (201) are provided on the side wall (200), and the drilling jig positioning pin (50) is used to position the strip drilling jig (20) on the side wall (200) through the base holes (201).

5. The profiled drilling jig for making holes in composite materials according to claim 4, characterized in that: The drilling tool fixing hole (21) is a countersunk hole, and the outer periphery of the drilling jig positioning pin (50) is provided with a stepped surface that cooperates with the countersunk hole.

6. The profiled drilling jig for making holes in composite materials according to claim 5, characterized in that: The head of the jig locating pin (50) is provided with a locating protrusion (51), and the locating protrusion (51) is used to be placed in the base hole (201). The tail of the jig locating pin (50) is provided with a pull rod (52), and the pull rod (52) is located outside the drilling tool fixing hole (21).

7. The profiled drilling jig for making holes in composite materials according to claim 1, characterized in that: A keyhole is provided at the bottom of the side beam (100), and a convex pressing block (31) is provided at the upper end of the first fastener (30), wherein the convex pressing block (31) is used to be inserted into the keyhole to fix the L-shaped fixing seat (10).

8. The profiled drilling jig for making holes in composite materials according to claim 7, characterized in that: The upper surface of the transverse mounting portion (11) is provided with a receiving groove (112) for receiving the convex pressing block (31), and the transverse mounting portion (11) is also provided with a first connecting hole (111) for the first fastener (30) to pass through, and the first connecting hole (111) and the receiving groove (112) are in communication with each other.

9. The profiled drilling jig for making holes in composite materials according to claim 1, characterized in that: A second connection hole (123) extending in the horizontal direction is provided at the upper portion of the vertical support fixing portion (12); the second connection hole (123) is used for a second fastener (40) to pass through; the second fastener (40) is used to press the strip drilling template (20) onto the side wall (200).

10. A method for positioning holes in composite turning, using the profiled drilling jig for holes in composite turning according to any one of claims 1 to 9, characterized in that: The positioning method comprises the following steps: The L-shaped fixing seat (10) is fixed to the side beam (100) so that the transverse mounting portion (11) of the L-shaped fixing seat (10) is in contact with the bottom of the side beam (100), and the vertical supporting fixing portion (12) of the L-shaped fixing seat (10) is in contact with the outer side surface of the side wall (200), and the transverse mounting portion (11) is fixed to the bottom of the side beam (100) by a first fastener (30); Placing a strip drilling template (20) on the drilling template fixing groove (122) of the vertical support fixing portion (12), and pressing the strip drilling template (20) onto the side wall (200); The countersinking integrated drill bits of the automatic feed drill are inserted into the drill tool fixing holes (21) of the strip drilling template (20) one by one, so as to drill holes one by one on the side beam (100) and the side wall (200).

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