Crankcase groove body deep hole machining method

Abstract

The invention discloses a crankcase groove body deep hole machining method, which belongs to the crankcase inner hole machining technology and comprises the following steps: S1, a drill plate matched with a machining panel is tightly attached to the machining panel, and a through hole position is designed on the drill plate corresponding to a to-be-machined point position; s2, an ejector rod capable of being adjusted in a telescopic mode is arranged between the interference plate and the machining panel, and the drill plate abuts against the machining panel; and S3, a cutter is adopted to align and penetrate through the through hole site from the side, away from the machining panel, of the interference plate, and hole machining is conducted on the machining panel. The scheme is specially used for machining the groove type wall face in the crankcase, especially for the situation that positioning structures such as screw holes do not exist on the groove body wall face, the machining method is simple, and the hole machining quality can be guaranteed.

Description

Technical Field

[0001] The present invention relates to a machining technology for the inner hole of a crankcase, and more specifically, it relates to a method for machining deep holes in the groove body of a crankcase. Background Art

[0002] The inside of the crankcase is usually used to accommodate and install the crankshaft structure. For different crankshaft structures, the crankcase body also needs to be designed into different structures. In a type of crankcase body, there is a rectangular groove body formed by two kinds of panels. One kind of panel is located inside the crankcase, and according to production requirements, hole machining needs to be carried out on this panel. Therefore, for machining the panel, the other kind of panel is located on the outer surface of the crankcase. There is a certain interval between this panel and the machining panel, and it will interfere with the hole machining operation on the machining panel. Therefore, it is an interfering panel. Normal cutting tools cannot be placed inside the groove body to machine the machining panel. Therefore, it is very difficult to machine the holes of this type of crankcase.

[0003] For example: Chinese Patent Publication No. CN209491360U, publication date October 15, 2019, the name of the utility model is a crankcase drilling and machining device. This application discloses a crankcase drilling and machining method. First, the flange opening of the crankcase is clamped in the bayonet of the positioning plate. After being firmly installed, the device is started, and three drilling components machine the holes of the crankcase from three different faces. It can perform individual drilling with each drill bit, or can be equipped with a multi-spindle device to perform multi-hole machining simultaneously, with high working efficiency and less labor consumption. However, this solution cannot perform hole machining on the groove body structure inside the crankcase. Directly using the corresponding cutting tool for machining may cause serious damage to the crankcase. Summary of the Invention

[0004] The present invention overcomes the problem of difficult hole machining inside the groove body structure of the crankcase, especially for the case where there is no positioning structure such as a screw hole on the groove body wall surface, and provides a method for machining deep holes in the groove body of the crankcase; this solution is specifically for machining the wall surface of the groove body inside the crankcase, the machining method is simple, and it can ensure the hole machining quality.

[0005] To solve the above technical problems, the present invention adopts the following technical solutions: A deep hole machining method for a crankcase groove body, wherein the crankcase is provided with interference plates and a machining panel that are parallel and spaced apart; the machining method includes the following steps: S1: Affix a drill template adapted to the machining panel to the machining panel, and design through-hole positions on the drill template corresponding to the points to be machined; S2: Place a retractable and adjustable ejector rod between the interference plate and the machining panel and press the drill template tightly against the machining panel; S3: Use a cutting tool to align with and pass through the through-hole positions from the side of the interference plate away from the machining panel to machine holes in the machining panel. The through-hole positions on the drill template can position the cutting tool, and at the same time, it can also ensure the stable machining of the cutting tool on the machining panel, avoiding damage to the machining panel caused by vibration and deviation of the cutting tool; the ejector rod can press the drill template tightly against the machining panel, making the drill template and the machining panel fit closely, improving the machining effect of the cutting tool on the machining panel. The cutting tool needs to machine holes from the outside of the interference surface to the points to be machined on the machining panel. Therefore, the overall machining method is relatively simple and can achieve the machining of the groove-shaped structure inside the crankcase.

[0006] Preferably, the ejector rod includes a screw rod and a support rod. One end of the support rod is fixedly connected to the drill template, and the other end of the support rod is screwed to the screw rod. The screw rod and the support member form an integral body through a threaded connection. One end of the support rod is fixedly connected to the drill template for pressing the drill template tightly, and the other end of the support rod is tightly pressed against the interference plate through telescopic adjustment, so that the drill template can be ensured to be fixed between the interference plate and the rectangular groove body of the machining panel.

[0007] Preferably, any one of the fixed connection methods of welding, screwing, or clamping is adopted between the support rod and the drill template. The support rod and the drill template can be fixed by connection methods such as welding, screwing, and clamping.

[0008] Preferably, symmetrically distributed positioning portions are provided on the drill template. The positioning portions can position the drill template and the machining panel.

[0009] Preferably, the positioning portion can form a positioning with the machining panel or the groove wall adjacent to the machining panel. The positioning portion can form a positioning with the surface of the machining panel or with the side position of the machining panel, and can be specifically selected according to the actual situation.

[0010] Preferably, a through-hole type drill bushing is provided at the through-hole positions on the drill template, and the drill bushing and the cutting tool are in clearance fit. The drill bushing is used to guide and position the cutting tool to ensure that the cutting tool will not deflect. After the cutting tool passes through the drill bushing, it can directly machine holes at the points to be machined.

[0011] Preferably, a guiding groove is provided on the interference plate corresponding to the position to be machined, and the guiding groove is coaxially arranged with the through hole position. The guiding groove can guide the tool and ensure that the tool is aligned with the machining position.

[0012] Preferably, the tool is a deep hole drilling gun, and the length of the tool is greater than the distance between the interference plate and the machining panel. The deep hole drilling gun is used as the tool, and the tool of the deep hole drilling gun has sufficient length and can extend from the outside of the interference plate to the surface of the machining panel for machining.

[0013] Preferably, at least two groups of ejector rods are provided, and the ejector rods are symmetrically arranged on the drill template. The number of ejector rods can be designed according to the length of the drill template. Arranging at least two groups can enable the drill template to have a good positioning effect and prevent the drill template from skewing.

[0014] Preferably, the drill bushing is arranged on the side of the drill template away from the machining panel, and an axial limit is formed between the drill bushing and the drill template. Arranging the drill bushing outside the drill template can guide the tool, and the axial limit between the drill bushing and the drill template can prevent the drill bushing from being pressed on the surface of the machining panel.

[0015] Compared with the prior art, the beneficial effects of the present invention are: (1) It can machine the inner hole of the crankcase in the case where there is no positioning structure such as a screw hole on the wall surface of the crankcase groove; (2) It solves the problem of tool shank interference and the problem that the tool cannot machine the machining panel through the interference surface; (3) By using the auxiliary support assembly, it solves the problem of vibration of the gun drill during the machining process and can effectively avoid the tool from deflecting. Description of the Drawings

[0016] Figure 1 It is a schematic structural diagram of the crankcase of the present invention.

[0017] Figure 2 It is a schematic diagram of the drill template cooperating with the ejector rod when located in the groove body of the present invention.

[0018] Figure 3 It is a schematic diagram of the cooperation between the ejector rod and the drill template of the present invention.

[0019] Figure 4 It is a schematic structural diagram of the drill template of the present invention.

[0020] Figure 5 It is another perspective schematic diagram of the drill template of the present invention.

[0021] Figure 6 It is a schematic structural diagram of the support rod of the present invention.

[0022] Figure 7 It is a schematic structural diagram of the drill bushing of the present invention.

[0023] Figure 8This is the top view of the drill template of the present invention.

[0024] Figure 9 This is the schematic structural diagram of another form of the drill template of the present invention.

[0025] In the figure: 1. Crankcase, 2. Interference plate, 3. Machining panel, 4. Point to be machined, 5. Drill template, 6. Through hole position, 7. Ejector rod, 8. Screw rod, 9. Support rod, 10. Positioning part, 11. Drill bushing, 12. Groove body, 13. Groove hole, 14. Groove wall, 15. Hollow hole, 16. Connecting hole, 17. Connecting part, 18. Machining table, 19. Welding point, 20. Guide groove, 21. Step part. Specific embodiments

[0026] The technical solution of the present invention will be further specifically described below through specific embodiments in conjunction with the accompanying drawings.

[0027] Embodiment 1: As Figure 1 shown, a crankcase 1 is provided with a rectangular groove body 12 on the front side. The top of the groove body 12 is an unclosed notch. The front end face of the crankcase 1 is an interference plate 2. The surface of the groove body 12 opposite to the interference plate 2 is a machining panel 3. There are several points to be machined 4 on the machining panel 3. The surface of the machining panel 3 is regular and smooth without structures such as threaded holes. Now, hole machining is required at the points to be machined 4 on the machining panel 3 of the crankcase 1. Among them, there is a certain interval between the interference plate 2 and the machining panel 3. Specifically, the distance from the machining panel 3 to the outer wall of the interference plate 2 is 344.5 mm. Five groups of circular groove holes 13 are respectively provided on the machining panel 3 and the interference plate 2. The five groups of groove holes 13 are spaced along the length direction of the groove body 12. At the transverse two ends of the machining panel 3 and the interference plate 2 are groove walls 14 integrated with the crankcase 1, thus forming a rectangular groove body 12 structure.

[0028] As Figures 3 to 7 shown, it is a hole machining auxiliary tooling inside the groove body 12 of the crankcase 1, including a drill template 5 and an ejector rod 7. Three groups of rectangular hollow holes 15 are provided in the middle position of the drill template 5, and one group of circular hollow holes 15 is provided on each side, that is, a total of five groups of hollow holes 15. The five groups of hollow holes 15 on the drill template 5 correspond to the five groups of hole grooves 13 on the machining panel 3, and can play a role in position calibration.

[0029] Through hole positions 6 are provided at the four corner positions of the drill template 5 corresponding to the hollow holes 15. The through hole positions 6 are circular through holes. Among them, the length dimension of the drill template 5 is 880 mm, with a unilateral allowance of 3 mm, the width dimension is 160 mm, and the thickness dimension is 13 mm; the diameter dimension of the through hole positions 6 is 18 mm, and the number of the through hole positions 6 is a total of 20 groups.

[0030] The drill template 5 is also provided with connecting holes 16. There are two groups of connecting holes 16 in total, and the two groups of connecting holes 16 are symmetrically arranged on the drill template 5. Specifically, the connecting holes 16 are distributed between the rectangular hollow hole 15 and the circular hollow hole 15 of the drill template 5. The radial dimension of the connecting hole 16 is 16 mm, and a chamfer is provided at one end of the connecting hole 16 facing the interference plate 2.

[0031] The ejector rod 7 includes a screw rod 8 and a support rod 9. The support rod 9 is connected to the screw rod 8 by a threaded connection method, and the connection length between the support rod 9 and the screw rod 8 can be adjusted through the spiral rotation action between the support rod 9 and the screw rod 8. Among them, the length dimension of the support rod 8 is 185 mm, the radial dimension is 32 mm, the length of the threaded hole in the support rod 8 is 45 mm, and the radial dimension is 16 mm. The length dimension of the screw rod 8 is 108 mm, the radial dimension of the screw rod 8 is 16 mm, and a locking nut is provided on the screw rod 8, and the locking nut can play a role in locking the support rod 9 and the screw rod 8.

[0032] Specifically, one end of the support rod 9 is provided with a connecting portion 17, the radial dimension of the connecting portion 17 is 16 mm, the other end of the support rod 9 is provided with a threaded hole, the threaded hole is arranged along the axial direction of the support rod 9, and the axes of the threaded hole and the support rod 9 coincide; the threaded section of the screw rod 8 is in fit connection with the threaded hole of the support rod 9.

[0033] As Figures 2 to 7 shown in a deep hole machining method for a crankcase groove body, which includes the following steps.

[0034] First, fix the crankcase 1 on the processing table 18. There are multiple groups of positioning rods arranged on the processing table 18, and the positioning rods are connected to the bottom of the crankcase 2 to achieve positioning, ensuring the position accuracy of the crankcase 2, so that the tool can find the correct point during the movement process. At the same time, make the interference plate 2 of the crankcase 1 face the position where the tool is located, so that the processing panel 3 can face the position where the tool is located.

[0035] Then, arrange the drill bushing 11 at the position of the through hole 6 on the drill template 5, and the drill bushing 11 is embedded in the through hole 6; then place the drill template 5 into the groove body 12 between the interference plate 2 and the processing panel 3, so that the five groups of hollow holes 15 on the drill template 5 and the five groups of slot holes 13 on the processing panel 3 are initially aligned, and then finely adjust the drill template 5 to make the drill template 5 close to the processing panel 3. At the same time, align the circular hollow holes 15 on both sides of the drill template 5 with the circular slot holes 13 on both sides of the processing panel 2, so as to determine the accurate position of the drill template 5. That is to say, at this time, the position of the through hole 6 on the drill template 5 will be aligned with the position of the to-be-machined point 4 on the processing panel 3, and the hole machined through the through hole 6 at this time is the hole structure required to be machined on the processing panel 3.

[0036] After the position of the drill template 5 is determined, fix the position of the drill template 5. Then place the ejector rod 7 into the groove 12 between the processing panel 3 and the interference plate 2. Specifically, the ejector rod 7 must be placed between the drill template 5 and the interference plate 2. Among them, the connecting part 17 of the support rod 9 is fixedly connected to the connecting hole 16 on the drill template 5. Then rotate the support rod 9 and the screw rod 8 relatively, so that the end of the screw rod 8 away from the support rod 9 gradually grows and abuts against the inner side wall of the interference plate 2. During this process, it is necessary to ensure that the screw rod 8 and the support rod 9 as a whole are perpendicular to the interference plate 2 and the processing panel 3 at the same time, and ensure that the screw rod 8 and the support rod 9 only bear horizontal axial forces, so as to ensure the tightening effect of the ejector rod 7 on the drill template 5. After the ejector rods 7 at two places on the drill template 5 are arranged, screw the locking nut on the screw rod 8 to the end face on one side of the threaded hole of the support rod 9, so that the relative rotation between the support rod 9 and the screw rod 8 can be restricted by the locking nut.

[0037] Among them, the fixing method of the connecting part 17 of the support rod 9 and the connecting hole 16 on the drill template 5 can adopt any one or a combination of connection methods such as welding, screwing or clamping. As Figure 4 shown, the connecting hole 16 on the drill template 5 is a threaded hole. At this time, the connecting part 17 on the support rod 9 is a threaded rod structure. Through the threaded connection method, the support rod 9 can be fixedly connected to the drill template 5. Another example is Figure 5 shown, the connecting hole 16 on the drill template 5 is a threaded hole. At this time, the connecting part 17 on the support rod 9 is a threaded rod structure. Through the threaded connection method, the support rod 9 can be preliminarily fixed to the drill template 5, and then four welding points 19 are welded at the circumferential positions of the connecting part 17 and the connecting hole 16, so as to fix the support rod 9 on the drill template 5. This can effectively prevent the vibration between the crankcase 1 and the drill template 5 during hole processing by the tool, causing the support rod 9 and the drill template 5 to become loose.

[0038] Finally, a cutting tool extends from the outer wall of the interference plate 2 into the processing panel 3 inside the crankcase 1. Among them, the cutting tool uses a deep-hole drilling gun. After the cutting tool passes through the drill bushing 11 on the drill template 5, hole machining is performed on the processing panel 3. Specifically, the length of the cutting tool needs to be greater than the distance between the outer wall of the interference plate 2 and the processing panel 3, so that the cutting tool can extend from the outside of the crankcase 1 to reach the specified point 4 to be machined. Among them, the drill bushing 11 has a stepped structure, and the drill bushing 11 has a through hole with an inner diameter of 8.5 mm. There is a clearance fit between the cutting tool and the drill bushing 11 to ensure that the cutting tool can smoothly pass through the drill bushing 11; the stepped part 21 of the drill bushing 11 is arranged on the side of the drill template 5 away from the processing panel. In this way, when the cutting tool extends into the crankcase 1 from one side of the interference plate 2, a force towards the processing panel 3 is generated on the drill bushing 11, and the stepped part 21 can prevent the drill bushing 11 from being squeezed onto the processing panel 3; it should be noted that a chamfer is provided at one end of the stepped part 21 of the drill bushing 11. Therefore, the drill bushing 11 can play a guiding and positioning role for the cutting tool. When the cutting tool starts to rotate, only an axial force is generated on the processing panel 3 (due to the effect of the drill bushing 11), ensuring that the cutting tool will not deflect. After the cutting tool passes through the drill bushing 11, hole machining can be directly performed at the point 4 to be machined.

[0039] It should also be noted that four guiding grooves 20 are provided on the circumferential inner walls of the five groups of circular groove holes 13 on the interference plate 2. The guiding grooves 20 are evenly distributed along the circumferential direction of the groove holes 13. The positions of the guiding grooves 20 are aligned with the positions of the through holes 6 and the points 4 to be machined. That is to say, the guiding grooves 20 can ensure the accurate position of the cutting tool and also play a guiding role for the cutting tool. This solution is specifically for the machining of the form wall surface of the groove body 12 inside the crankcase 1. The machining method is simple and can ensure the quality of hole machining.

[0040] Example 2: As Figure 1 shown, a crankcase 1 has a rectangular groove body 12 provided on the front side of the crankcase 1. The top of the groove body 12 is an unclosed notch. The front end face of the crankcase 1 is an interference plate 2. The surface of the processing panel 3 opposite to the interference plate 2 inside the groove body 12 has several points 4 to be machined. The surface of the processing panel 3 is regular and smooth, without structures such as threaded holes. Now, hole machining needs to be performed at the points 4 to be machined on the processing panel 3 of the crankcase 1. Among them, there is a certain interval between the interference plate 2 and the processing panel 3. Specifically, the distance from the processing panel 3 to the outer wall of the interference plate 2 is 344.5 mm; five groups of circular groove hole 13 structures are respectively provided on the processing panel 3 and the interference plate 2. The five groups of groove holes 13 are spaced along the length direction of the groove body 12. At the transverse two ends of the processing panel 3 and the interference plate 2 are groove walls 14 integrated with the crankcase 1, thus forming a rectangular groove body 12 structure.

[0041] As Figures 3 to 9The following shows an auxiliary tooling for hole machining in the tank body 12 of the crankcase 1, which includes a drill template 5 and a push rod 7. In the middle position of the drill template 5, there are three groups of rectangular hollow hole 15 structures, and on both sides, there is a group of circular hollow hole 15 structures respectively, that is, a total of five groups of hollow holes 15. The five groups of hollow holes 15 on the drill template 5 correspond to the five groups of hole slots 13 on the processing panel 3, and can play a role in position calibration.

[0042] At the four corner positions of the drill template 5 corresponding to the hollow holes 15, there are through holes 6, and the through holes 6 are circular through holes. Among them, the length dimension of the drill template 5 is 880 mm, with a unilateral allowance of 3 mm, the width dimension is 160 mm, and the thickness dimension is 13 mm; the diameter dimension of the through holes 6 is 18 mm, and the number of the through holes 6 is a total of 20 groups.

[0043] The drill template 5 is also provided with connecting holes 16. There are two groups of connecting holes 16 in total, and the two groups of connecting holes 16 are symmetrically arranged on the drill template 5. Specifically, the connecting holes 16 are distributed between the rectangular hollow holes 15 and the circular hollow holes 15 of the drill template 5. The radial dimension of the connecting holes 16 is 16 mm, and there is a chamfer at one end of the connecting holes 16 facing the interference plate 2.

[0044] The drill template 5 is also provided with a positioning part 10. Specifically, since there are five groups of circular slot holes 13 structures in the crankcase 1, and the drill template 5 correspondingly has five groups of hollow holes 15, and the two groups of hollow holes 15 on both sides are also circular, so the positioning part 10 can be arranged on the two groups of circular hollow holes 15, specifically as Figure 4 and Figure 8 shown. The positioning part 10 is a disc-shaped structure, and the size of the positioning part 10 is adapted to the size of the slot hole 13. In this way, the positioning part 10 can cooperate with the slot hole 13 of the crankcase 1, so that the whole drill template 5 can be initially positioned inside the tank body 12. Among them, the thickness dimension of the positioning part 10 is 12 mm. It should be noted that for the case where there are no slot holes 13 on the processing panel 3, a drill template as shown in Figure 9 can be used. Among them, the positioning part 10 of the drill template 5 is arranged on both sides in the length direction of the drill template 5, and the positioning part 10 is in the form of a boss. When the drill template 5 is placed in the tank body 12, the positioning part 10 can be lapped on the two side walls 14 of the tank body 12, and the positioning of the drill template 5 in the vertical plane is realized through the side walls 14, and then the positioning in the horizontal plane is realized through the push rod 7; preferably, the size of the positioning part 10 does not exceed the thickness dimension of the side wall 14 of the tank body 12. In this embodiment, the case where there are slot holes 13 on the processing panel 3 is taken as an example for illustration.

[0045] The ejector rod 7 includes a screw rod 8 and a support rod 9. The support rod 9 is connected to the screw rod 8 by means of threaded connection. And through the spiral rotation between the support rod 9 and the screw rod 8, the connection length between the support rod 9 and the screw rod 8 can be adjusted. Among them, the length dimension of the support rod 8 is 185 mm, the radial dimension is 32 mm, the length of the threaded hole in the support rod 8 is 45 mm, and the radial dimension is 16 mm. The length dimension of the screw rod 8 is 108 mm, the radial dimension of the screw rod 8 is 16 mm. A locking nut is provided on the screw rod 8, and the locking nut can play a role in locking the support rod 9 and the screw rod 8.

[0046] Specifically, a connecting portion 17 is provided at one end of the support rod 9. The radial dimension of the connecting portion 17 is 16 mm. A threaded hole is provided at the other end of the support rod 9. The threaded hole is arranged along the axial direction of the support rod 9, and the axes of the threaded hole and the support rod 9 coincide; the threaded section of the screw rod 8 is in mating connection with the threaded hole of the support rod 9.

[0047] Such as Figures 2 to 7 shown in a deep hole machining method for the crankcase groove body, which includes the following steps.

[0048] First, fix the crankcase 1 on the processing table 18. Multiple positioning rods are arranged on the processing table 18. The positioning rods are connected to the bottom of the crankcase 2 to achieve positioning, ensuring the position accuracy of the crankcase 2, so that the tool can find the correct point during the movement process. At the same time, make the interference plate 2 of the crankcase 1 face the position where the tool is located, so that the processing panel 3 can face the position where the tool is located.

[0049] Then, arrange the drill bushing 11 at the position of the through hole 6 on the drill template 5. The drill bushing 11 is embedded in the through hole 6; then place the drill template 5 into the groove body 12 between the interference plate 2 and the processing panel 3, so that the positioning portion 10 on the drill template 5 and the groove holes 13 on both sides of the processing panel 3 are initially aligned, so as to determine the accurate position of the drill template 5. That is to say, at this time, the position of the through hole 6 on the drill template 5 will be aligned with the position of the to-be-machined point 4 on the processing panel 3. The hole machined through the through hole 6 at this time is the hole structure required to be machined on the processing panel 3.

[0050] After the position of the drill template 5 is determined, fix the position of the drill template 5 and then place the ejector rod 7 into the groove 12 between the processing panel 3 and the interference plate 2. Specifically, the ejector rod 7 must be placed between the drill template 5 and the interference plate 2. Among them, the connecting portion 17 of the support rod 9 is fixedly connected to the connecting hole 16 on the drill template 5, and then rotate the support rod 9 and the screw rod 8 relatively, so that the end of the screw rod 8 away from the support rod 9 gradually extends and abuts against the inner side wall of the interference plate 2; during this process, it is necessary to ensure that the screw rod 8 and the support rod 9 as a whole are perpendicular to the interference plate 2 and the processing panel 3 at the same time, and ensure that the screw rod 8 and the support rod 9 only bear horizontal axial forces, so as to ensure the tightening effect of the ejector rod 7 on the drill template 5. After the ejector rods 7 at two places on the drill template 5 are arranged, screw the locking nut on the screw rod 8 to the end face of the threaded hole on the support rod 9, so that the relative rotation between the support rod 9 and the screw rod 8 can be restricted by the locking nut.

[0051] Among them, the fixing method of the connecting portion 17 of the support rod 9 and the connecting hole 16 on the drill template 5 can adopt any one or a combination of connection methods such as welding, screwing or clamping. As Figure 4 shown, the connecting hole 16 on the drill template 5 is a threaded hole. At this time, the connecting portion 17 on the support rod 9 is a threaded rod structure, and through the threaded connection method, the support rod 9 can be fixedly connected to the drill template 5. Another example is Figure 5 shown, the connecting hole 16 on the drill template 5 is a threaded hole. At this time, the connecting portion 17 on the support rod 9 is a threaded rod structure, and through the threaded connection method, the support rod 9 can be initially fixed to the drill template 5, and then four welding points 19 are welded at the circumferential positions of the connecting portion 17 and the connecting hole 16, so as to fix the support rod 9 on the drill template 5, which can effectively prevent vibration between the crankcase 1 and the drill template 5 during hole processing by the tool, causing loosening between the support rod 9 and the drill template 5.

[0052] Finally, a cutting tool extends from the outer wall of the interference plate 2 into the machining panel 3 inside the crankcase 1. Among them, the cutting tool uses a deep-hole drilling gun. After the cutting tool passes through the drill bushing 11 on the drill template 5, hole machining is performed on the machining panel 3. Specifically, the length of the cutting tool needs to be greater than the distance between the outer wall of the interference plate 2 and the machining panel 3, so that the cutting tool can extend from the outside of the crankcase 1 to reach the specified point to be machined 4. Among them, the drill bushing 11 has a stepped structure, and the drill bushing 11 has a through hole with an inner diameter size of 8.5 mm. There is a clearance fit between the cutting tool and the drill bushing 11 to ensure that the cutting tool can smoothly pass through the drill bushing 11; the stepped portion 21 of the drill bushing 11 is arranged on the side of the drill template 5 away from the machining panel. In this way, when the cutting tool extends into the crankcase 1 from one side of the interference plate 2, a force towards the machining panel 3 is generated on the drill bushing 11, and the stepped portion 21 can prevent the drill bushing 11 from being squeezed onto the machining panel 3; it should be noted that a chamfer is provided at one end of the stepped portion 21 of the drill bushing 11. Therefore, the drill bushing 11 can play a role in guiding and positioning the cutting tool. When the cutting tool starts to rotate, only an axial force is generated on the machining panel 3 (due to the effect of the drill bushing 11), ensuring that the cutting tool will not deflect. After the cutting tool passes through the drill bushing 11, hole machining can be directly performed at the point to be machined 4.

[0053] It should also be noted that four guide grooves 20 are provided on the circumferential inner walls of the five groups of circular groove holes 13 on the interference plate 2. The guide grooves 20 are evenly distributed along the circumferential direction of the groove holes 13. The positions of the guide grooves 20 are aligned with the positions of the through holes 6 and the points to be machined 4. That is to say, the guide grooves 20 can ensure the accurate position of the cutting tool and also play a guiding role for the cutting tool. This solution is specifically for machining the form wall surface of the inner groove body 12 of the crankcase 1. The machining method is simple and can ensure the quality of hole machining.

Claims

1. A deep hole machining method for a crankcase groove body, characterized in that, The crankcase is provided with interference plates and processing panels that are parallel and spaced apart; the processing method includes the following steps: S1: Attach a drill template adapted to the processing panel tightly to the processing panel, and design through hole positions on the drill template corresponding to the points to be processed; S2: Place a retractable and adjustable ejector rod between the interference plate and the processing panel and press the drill template tightly against the processing panel; S3: Use a tool to align with and pass through the through hole positions from the side of the interference plate away from the processing panel, and perform hole processing on the processing panel.

2. The deep hole machining method for a crankcase groove body according to claim 1, characterized in that The ejector rod includes a screw rod and a support rod. One end of the support rod is fixedly connected to the drill template, and the other end of the support rod is screwed to the screw rod.

3. A deep hole machining method for a crankcase groove body according to claim 2, characterized in that, The support rod and the drill template are fixedly connected by any one of welding, screwing or clamping.

4. A deep hole machining method for a crankcase groove body according to claim 1, characterized in that Symmetrically distributed positioning parts are provided on the drill template.

5. A method for machining deep holes in a crankcase housing according to claim 4, characterized in that, The positioning parts can form positioning with the processing panel or the side wall adjacent to the processing panel.

6. A deep hole machining method for a crankcase groove body according to any one of claims 1 to 5, characterized in that, Through hole type drill bushings are arranged at the through hole positions on the drill template, and the drill bushings and the tool are in clearance fit.

7. A deep hole machining method for a crankcase groove body according to any one of claims 1 to 5, characterized in that Guide grooves are arranged on the interference plate corresponding to the points to be processed, and the guide grooves are coaxially arranged with the through hole positions.

8. A method for machining deep holes in a crankcase housing according to any one of claims 1 to 5, characterized in that, The tool is a deep hole drill gun, and the length of the tool is greater than the distance between the interference plate and the processing panel.

9. A deep hole machining method for a crankcase groove body according to any one of claims 1 to 5, characterized in that, At least two groups of ejector rods are provided, and the ejector rods are symmetrically arranged on the drill template.

10. A method for machining deep holes in a crankcase housing according to claim 6, characterized in that, The drill bushings are arranged on the side of the drill template away from the processing panel, and axial limits are formed between the drill bushings and the drill template.

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