Turning method for thin-walled cylinder with reinforcing ribs on inner molded surface

Abstract

A turning method for a thin-walled cylinder with reinforcing ribs on an inner molded surface is suitable for turning the thin-walled cylinder with the reinforcing rib structure on the inner wall, the ratio of the diameter to the wall thickness larger than 200 and the length-diameter ratio larger than 2, and has the advantages of being simple in tool, reasonable in design, easy to operate and low in cost. Compared with a traditional turning method using a horizontal lathe and an inner supporting tool, the turning method has the advantages that the percent of pass of the products can be increased by more than 40%, the diameter dimensional tolerance of the products is controlled to be within 0.15 from 0.3, the wall thickness dimensional tolerance is controlled to be within 0.2 from 0.3, and the uniformity of the wall thickness of the products is improved. In conclusion, the method is convenient, reasonable in design, low in implementation cost, capable of being effectively applied to machining of the thin-wall metal cylinder with the reinforcing rib structure on the inner molded surface, easy to operate, high in practicability, good in anti-deformation effect, capable of effectively improving the product percent of pass, good in use effect and convenient to apply and popularize.

Description

Technical Field

[0001] The invention relates to the technical field of turning, in particular to a turning method for a thin-walled cylinder with reinforcing ribs on its inner surface. Background Art

[0002] Most traditional metal shell cylinders are thin-walled long cylinders with no reinforcement structure on the inner and outer walls. The required diameter and wall thickness of the cylinder are achieved through spinning. A small number of steel cylinders with smaller diameters are machined on horizontal lathes to achieve the required size, but there are problems such as uneven wall thickness and easy dimensional deviations.

[0003] The China Air-to-Air Missile Research Institute published "Processing Technology of a Certain Thin-walled Cylinder Product" in the "Aviation Precision Manufacturing Technology" Volume 60, Issue 2, 2024. It conducted a process analysis on the components and structural characteristics of a certain thin-walled cylinder product, summarized its processing difficulties, and proposed certain solutions to the problem of deep hole turning of small-diameter cylinders. It gave conclusions on machine tool selection, clamping methods, tool selection, and cutting parameters, and solved the problem that the high-precision deep hole diameter size of parts is difficult to guarantee. However, the research object is a small-diameter cylinder of about φ100, and the inner and outer surfaces do not have reinforcing rib structures. Guizhou Aerospace Science and Technology Development Co., Ltd. published "Processing Technology of Thin-walled Cylindrical Parts" in "Machinery Manufacturing" Vol. 61, No. 3, 2023. Aiming at the problem that thin-walled cylindrical parts are prone to vibration and deformation during turning, the stress generated by forgings during machining and clamping is effectively removed through heat treatment, tool selection, optimization of cutting parameters, and improved clamping, thereby reducing the vibration and deformation of the cylinder. However, the tooling cannot clamp and turn the outer cylindrical surface of the cylinder in one time, and cannot avoid cutting on the outer cylindrical surface, and the consistency of the outer cylindrical surface size cannot reach the optimal state. Nanjing Electromechanical Hydraulic Engineering Research Center published "Thin-walled Cylinder Parts Processing Tooling" in "Internal Combustion Engines and Accessories" Vol. 15, 2017, Article 34. It designed a tooling for end face and outer profile processing of thin-walled cylinders, which solved the clamping and outer profile processing problems when there are special-shaped structures on the outer profile of thin-walled cylinders. It is suitable for thin-walled cylinders with simple inner hole structures and small aspect ratios.

[0004] The research on the processing method of thin-walled cylinders is mainly aimed at thin-walled cylinders with uniform wall thickness and no reinforcing rib structure on the inside, and most of them are about 200mm in diameter and are suitable for processing on horizontal lathes. Summary of the invention

[0005] In order to overcome the deficiency of the prior art that there is no method for processing a thin-walled cylinder with reinforcing ribs on the inner surface, the present invention provides a method for turning a thin-walled cylinder with reinforcing ribs on the inner surface.

[0006] The specific process of the present invention is:

[0007] Step 1: Rough turning of the outer surface of the thin-walled cylinder:

[0008] Fix the cylinder on the workbench of the vertical lathe. Turn the outer surface, leaving a processing allowance of 1mm, and retain the tooling press at both end surfaces.

[0009] A thin-walled cylinder with tooling press platforms at both ends of the outer circumferential surface is obtained.

[0010] When rough turning the outer surface of a thin-walled cylinder, the turning speed v = 30 ~ 35r / min, the feed rate f = 0.2 ~ 0.25mm / r, and the turning depth a p =2mm.

[0011] Step 2, rough turning of the inner surface of the thin-walled cylinder:

[0012] Installation tooling,

[0013] The lower end surface of the thin-walled cylinder is fixed on the vertical lathe workbench by a lathe pressure plate. The thin-walled cylinder is aligned. There are three alignment sections, which are evenly distributed along the axial direction of the thin-walled cylinder, and the runout of the thin-walled cylinder is less than 0.3.

[0014] The inner surface of the thin-walled cylinder is rough-turned, leaving a 1 mm margin. The rough-turning of the inner surface of the thin-walled cylinder is completed.

[0015] When installing the tooling, place the outer pressure plate on the upper end surface of the thin-walled cylinder, and clamp the stopper on the inner circumferential surface of the outer pressure plate on the tooling press table of the thin-walled cylinder. Install the upper end of the screw into the connecting hole on the outer pressure plate and tighten it; install the lower end of the screw into the screw hole of the slider on the workbench of the vertical lathe. And use a pressure plate to press the lower end press table.

[0016] Step 3, Time limit:

[0017] Natural aging time ≥ 24h.

[0018] Step 4, end face exposed to light:

[0019] The thin-walled cylinder that has undergone aging treatment is clamped on a vertical lathe, and both end surfaces of the thin-walled cylinder are exposed to light.

[0020] Step 5, finishing of the inner surface of the thin-walled cylinder:

[0021] Repeat the process of installing the tooling and aligning the thin-walled cylinder in step 2, fix the thin-walled cylinder on the vertical lathe, and make the run-out of the thin-walled cylinder less than 0.05.

[0022] Finish turning the inner surface of the thin-walled cylinder. Finish turning the inner surface of the thin-walled cylinder.

[0023] When finishing the inner surface of a thin-walled cylinder, the turning speed v = 20 ~ 30r / min, the feed rate f = 0.2 ~ 0.25mm / r, the turning depth of the first pass a p1 =0.65~0.8mm, second pass a p2 =0.2~0.35mm; and record the axial machining allowance of the inner surface reinforcement rib.

[0024] Step 6, finishing of the outer surface of the thin-walled cylinder:

[0025] Install the tooling.

[0026] Repeat the thin-walled cylinder alignment process described in step 2, and make the runout of the thin-walled cylinder less than 0.05.

[0027] Repeat the turning process described in step 5 to ensure the diameter and wall thickness;

[0028] Complete the fine turning of the outer surface of the thin-walled cylinder, record the axial allowances at both ends of the front and rear ends of the cylinder, and make data handover for cylinder cutting.

[0029] Install the bracket on the workbench through the lathe pressure plate, align the bracket; put the cylinder on the sleeve matching surface of the bracket; place the inner pressure plate on the upper end surface of the thin-walled cylinder, and make the stopper on the outer circumferential surface of the inner pressure plate clamp on the inner circumferential surface of the thin-walled cylinder. Install the upper end of the screw into the connecting hole on the inner pressure plate, and the lower end of the screw into the connecting hole on the bracket, and tighten;

[0030] Step 7, cutting of thin-walled cylinder

[0031] According to the axial machining allowances of the front and rear ends of the cylinder recorded by the vertical lathe, the cylinder is cut off and the welding groove is turned. The total length of the cylinder is L1, the distance from the rear end surface of the cylinder to the inner surface reinforcement rib is L5; the height of the welding groove is h, and the angle of the groove is a.

[0032] At this point, the turning process of the thin-walled cylinder is completed, and a thin-walled cylinder with reinforcing ribs on the inner surface is obtained.

[0033] When cutting the thin-walled cylinder, the thin-walled cylinder support is installed on a horizontal lathe, the top block bolts of the cylinder support are screwed to the minimum diameter, the rear end of the cylinder is installed outside the cylinder support, the top block bolts are tightened to the inner wall of the cylinder, the cylinder is supported internally, and the other end is supported by the lathe tailstock to support the inner diameter of the cylinder.

[0034] The tooling for the outer circumference of the tooling press platform reserved for rough turning the outer cylindrical surface includes an outer pressure plate. The inner diameter ΦD1 of the outer pressure plate is clearance matched with the outer diameter of the tooling press platform, and the clearance is 0.5-0.7mm.

[0035] The tooling press table reserved for rough turning of the outer cylindrical surface and the internal pressure tooling for the inner surface size after fine turning include an inner pressure plate and a bracket. The outer diameter of the small end of the inner pressure plate is ΦD3, which matches the inner diameter size of the cylinder, and the matching clearance is 0.1-0.2mm. The upper end face of the cylinder is the positioning surface. The end face E formed by the outer diameter difference between the large end and the small end of the outer circumferential surface of the inner pressure plate matches the upper end face of the cylinder. The flatness of the E end face of the inner pressure plate is 0.05mm, and the parallelism with the upper end face of the cylinder is 0.05mm, which ensures the roundness of the outer cylindrical surface.

[0036] The diameter of the small diameter end of the bracket is ΦD4, which matches the inner diameter of the cylinder, and the matching clearance is 0.1-0.2mm. The lower end face of the cylinder is used as the positioning surface. The end face H formed by the diameter difference of the circumferential surface of the bracket matches the lower end face of the cylinder; the flatness of the H end face is 0.05mm, and the parallelism with the lower end face of the cylinder is 0.05mm, ensuring the roundness of the outer cylindrical surface. The sharp corners need to be cleaned to prevent wear on the cylinder.

[0037] The present invention is suitable for thin-walled cylinders with a reinforcing rib structure on the inner wall, a diameter-to-wall thickness ratio greater than 200, and an aspect ratio greater than 2. During turning processing, a clamping tooling that can prevent deformation and ensure that there is no tool contact on the inner and outer diameters needs to be designed.

[0038] Compared with the prior art, the present invention has the following advantages:

[0039] 1. The present invention can be effectively applied to the processing of thin-walled cylinders with reinforcing ribs on the inner surface.

[0040] 2. The invention has simple tooling, reasonable design, convenient implementation and low cost.

[0041] 3. The present invention is simple to operate, easy to use, and suitable for on-site operation.

[0042] 4. Compared with the traditional turning method using a horizontal lathe and an internal support, this method can increase the qualified rate of such products by more than 40%, control the product diameter tolerance from 0.3 to within 0.15, and control the wall thickness tolerance from 0.3 to within 0.2, thereby improving the uniformity of the product wall thickness.

[0043] In summary, the method of the present invention is convenient, reasonably designed, and has low implementation cost. It can be effectively applied to the machining of thin-walled metal cylinders with reinforcing rib structures on the inner surfaces. It is simple to operate, highly practical, and has good anti-deformation effect. It can effectively improve the product qualification rate, has good use effect, and is easy to promote and apply. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 It is a structural schematic diagram of a thin-walled cylinder with reinforcing ribs on the inner surface.

[0045] Figure 2This is a schematic diagram of the inner surface of the fine turning process. ΦD5 is the diameter of the outer cylindrical surface of the cylinder ΦD plus a 2mm machining allowance.

[0046] Figure 3 It is a schematic diagram of the fine turning outer surface.

[0047] Figure 4 It is a schematic diagram of installing a cylinder support on a horizontal lathe.

[0048] Figure 5 It is a schematic diagram of cutting a cylinder.

[0049] Figure 6 It is a structural schematic diagram of the outer pressure plate.

[0050] Figure 7 This is a schematic diagram of the structure of the inner pressure plate.

[0051] Figure 7a This is an enlarged view of the inner pressure plate at point I.

[0052] Figure 7b This is the S view of the inner pressure plate

[0053] Figure 8 It is a structural diagram of the bracket.

[0054] Figure 8a This is an enlarged structural diagram of bracket I.

[0055] Fig. 9 It is a flow chart of the present invention.

[0056] In the figure: 1. front end of the cylinder; 2. rear end of the cylinder; 3. nut; 4. outer pressure plate; 5. screw; 6. inner pressure plate; 7. bracket; 8. cylinder support. DETAILED DESCRIPTION

[0057] The present invention is a method for turning a thin-walled cylinder with reinforcing ribs on the inner surface.

[0058] The wall thickness δ1 of the cylinder is 2 to 8 mm; the inner profile contains a plurality of reinforcing ribs; the outer diameter D of the cylinder is 300 to 1500 mm, and the total length L1 is 600 to 3000 mm.

[0059] The technical solution of the present invention will be further described in detail through three embodiments.

[0060] The specific process of the present invention is:

[0061] Step 1: Rough turning of the outer surface of the thin-walled cylinder:

[0062] Fix the cylinder on the vertical lathe workbench; align the outer circle so that the runout is less than 0.3. Turn the outer surface, leaving a machining allowance of 1mm, and retain the tooling press at both end surfaces.

[0063] When rough turning the outer surface of a thin-walled cylinder, the turning speed v = 30 ~ 35r / min, the feed rate f = 0.2 ~ 0.25mm / r, and the turning depth a p =2mm.

[0064] A thin-walled cylinder with tooling press platforms at both ends of the outer circumferential surface is obtained.

[0065] Table 1 Technical features of each embodiment in step 1

[0066]

[0067] Step 2, rough turning of the inner surface of the thin-walled cylinder:

[0068] Install the tooling, place the outer pressure plate 4 on the upper end face of the thin-walled cylinder, and clamp the stopper on the inner circumferential surface of the outer pressure plate on the tooling press table of the thin-walled cylinder. Install the upper end of the screw into the connecting hole on the outer pressure plate and tighten it through the nut 3; install the lower end of the screw into the screw hole of the slider on the vertical lathe workbench. Fix the lower end face of the thin-walled cylinder on the vertical lathe workbench through the lathe pressure plate. Align the thin-walled cylinder; there are three alignment sections, evenly distributed along the axial direction of the thin-walled cylinder, and the runout of the thin-walled cylinder is less than 0.3.

[0069] The inner surface of the thin-walled cylinder is rough-turned, leaving a 1 mm margin. The rough-turning of the inner surface of the thin-walled cylinder is completed.

[0070] Step 3, Time limit:

[0071] Natural aging time ≥ 24h.

[0072] Step 4: Expose the end face to light:

[0073] The thin-walled cylinder that has undergone aging treatment is clamped on a vertical lathe, and both end surfaces of the thin-walled cylinder are exposed to light.

[0074] Step 5, finishing of the inner surface of the thin-walled cylinder:

[0075] Repeat the process of installing the tooling and aligning the thin-walled cylinder in step 2, fix the thin-walled cylinder on the vertical lathe, and make the run-out of the thin-walled cylinder less than 0.05.

[0076] When finishing the inner surface of a thin-walled cylinder, the turning speed v = 20 ~ 30r / min, the feed rate f = 0.2 ~ 0.25mm / r, the turning depth of the first pass a p1 =0.65~0.8mm, second pass a p2 =0.2~0.35mm; and record the axial machining allowance of the inner surface reinforcement rib.

[0077] Finish turning the inner surface of the thin-walled cylinder. Finish turning the inner surface of the thin-walled cylinder.

[0078] Table 2 Process parameters of each embodiment in step 5

[0079]

[0080] Step 6, finishing of the outer surface of the thin-walled cylinder:

[0081] Install the tooling, install the bracket 7 on the workbench through the lathe pressure plate, align the bracket 7; put the cylinder on the sleeve matching surface of the bracket 7; place the inner pressure plate 6 on the upper end surface of the thin-walled cylinder, and make the stopper on the outer circumferential surface of the inner pressure plate clamp on the inner circumferential surface of the thin-walled cylinder. Install the upper end of the screw into the connection hole on the inner pressure plate, and the lower end of the screw into the connection hole on the bracket 7, and tighten it with the nut 3;

[0082] Repeat the thin-walled cylinder alignment process described in step 2, and make the runout of the thin-walled cylinder less than 0.05.

[0083] Repeat the turning process described in step 5 to ensure the diameter and wall thickness;

[0084] Complete the fine turning of the outer surface of the thin-walled cylinder, record the axial allowances at both ends of the front end 1 and the rear end 2 of the cylinder, and make data handover for cutting the cylinder.

[0085] Step 7, cutting of thin-walled cylinder

[0086] Install the cylinder support on the horizontal lathe, screw the top block bolt 9 of the cylinder support 8 to the minimum diameter, install the rear end 2 of the cylinder outside the cylinder support 8, tighten the top block bolt 9 to the inner wall of the cylinder, support the cylinder inside, and use the lathe tailstock to support the inner diameter of the cylinder at the other end. Cut according to the axial machining allowance of the front end 1 and the rear end 2 of the cylinder recorded by the vertical lathe, and turn the welding groove. The total length of the cylinder is L1, the distance from the rear end face of the cylinder to the inner surface reinforcement rib is L5; the height of the welding groove is h, and the angle of the groove is a.

[0087] The tooling in the outer diameter of the tooling press platform reserved for rough turning the outer cylindrical surface includes an outer pressure plate 4, a screw 5 and a nut 3. The outer pressure plate 4 is made of 45 steel, and its inner diameter ΦD1 is clearance-matched with the outer diameter of the tooling press platform, and the clearance is 0.5-0.7mm. The inner diameter ΦD2 is consistent with the inner diameter of the cylinder after fine turning. The outer pressure plate 4 is provided with connecting holes for installing the screw 5, and the outer pressure plate is fixed to the workbench by the screw 5 and the nut 3. The outer pressure plate can clamp the cylinder on the outside of the cylinder and prevent the cylinder from swinging and deforming during the turning process. It is used when turning the inner surface. The assembly relationship is as follows. Figure 2 shown.

[0088] The tooling press table reserved for rough turning of the outer cylindrical surface and the tooling for the inner profile size after fine turning are internal pressure tooling, which is used for fine turning of the outer profile. The internal pressure tooling includes an internal pressure plate 6, a bracket 7 and a screw 5. The internal pressure plate 6 and the bracket 7 are both made of 45 steel.

[0089] The outer diameter of the small end of the inner pressure plate 6 is ΦD3, which matches the inner diameter of the cylinder, and the matching clearance is 0.1-0.2mm. The upper end face of the cylinder is a positioning surface. The end face E formed by the outer diameter difference between the large end and the small end of the outer circumferential surface of the inner pressure plate 6 matches the upper end face of the cylinder. The flatness of the E end face of the inner pressure plate 6 is 0.05mm, and the parallelism with the upper end face of the cylinder is 0.05mm, ensuring the roundness of the outer cylindrical surface. The sharp corners need to be cleaned to prevent wear on the cylinder. Through holes for installing long screws 5 are evenly distributed on the inner pressure plate 6.

[0090] The diameter of the small diameter end of the bracket 7 is ΦD4, which matches the inner diameter of the cylinder, and the matching clearance is 0.1-0.2mm. The lower end face of the cylinder is used as the positioning surface. The end face H formed by the diameter difference of the circumferential surface of the bracket 7 matches the lower end face of the cylinder; the flatness of the H end face is 0.05mm, and the parallelism with the lower end face of the cylinder is 0.05mm, ensuring the roundness of the outer cylindrical surface. The sharp corners need to be cleaned to prevent wear on the cylinder. There are mounting holes on the bracket 7 for installing the screw 5, through which the inner pressure plate 6 is connected to the bracket 7 and fastened by the nut 3.

[0091] The tooling can effectively support the cylinder through the cylindrical surface that matches the inner diameter of the cylinder, reducing the deformation of the cylinder. The double-step design of the bracket 7 can complete the processing of the outer cylindrical surface of the cylinder with one clamping, avoiding the secondary clamping and alignment caused by turning, and avoiding the risk of cutting edge contact on the outer cylindrical surface.

Claims

1. A method for turning a thin-walled cylinder with reinforcing ribs on the inner surface, characterized in that: The specific process is: Step 1: Rough turning of the outer surface of the thin-walled cylinder: Fix the cylinder on the workbench of the vertical lathe; turn the outer surface, leaving a machining allowance of 1mm, and retain the tooling press at both end surfaces; A thin-walled cylinder with tooling press platforms at both ends of the outer circumferential surface is obtained; Step 2, rough turning of the inner surface of the thin-walled cylinder: Installation tooling, The lower end surface of the thin-walled cylinder is fixed on the vertical lathe workbench by a lathe pressing plate, and the lower end pressing plate is pressed by the pressing plate; the thin-walled cylinder is aligned; there are three alignment sections, which are evenly distributed along the axial direction of the thin-walled cylinder, and the runout of the thin-walled cylinder is less than 0.3; Rough turning the inner surface of the thin-walled cylinder, leaving a 1mm margin; completing the rough turning of the inner surface of the thin-walled cylinder; Step 3, Time limit: Natural aging time ≥ 24h; Step 4: Expose the end face to light: The thin-walled cylinder that has undergone aging treatment is clamped on a vertical lathe, and the end surfaces of both ends of the thin-walled cylinder are exposed to light; Step 5, finishing of the inner surface of the thin-walled cylinder: Repeat the process of installing the tooling and aligning the thin-walled cylinder in step 2, fix the thin-walled cylinder on the vertical lathe, and make the runout of the thin-walled cylinder less than 0.05; Finish turning the inner surface of the thin-walled cylinder; Finish turning the inner surface of the thin-walled cylinder; Step 6, finishing of the outer surface of the thin-walled cylinder: Installation tooling; Repeat the thin-walled cylinder alignment process described in step 2, and make the runout of the thin-walled cylinder less than 0.05; Repeat the turning process described in step 5 to ensure the diameter and wall thickness; Finish the machining of the thin-walled cylinder's outer surface, record the axial allowances at both ends of the cylinder's front end (1) and the cylinder's rear end (2), and make data handover for cylinder cutting; Step 7, cutting of thin-walled cylinder The front end (1) and the rear end (2) of the cylinder are cut off according to the axial machining allowance recorded by the vertical lathe, and the welding groove is turned; the total length of the cylinder is L1, and the distance from the rear end surface of the cylinder to the inner surface reinforcement rib is L5; the height of the welding groove is h, and the angle of the groove is a; At this point, the turning process of the thin-walled cylinder is completed, and a thin-walled cylinder with reinforcing ribs on the inner surface is obtained.

2. The turning method of a thin-walled cylinder with reinforcing ribs on the inner surface as claimed in claim 1, characterized in that: When rough turning the outer surface of a thin-walled cylinder, the turning speed v = 30 ~ 35r / min, the feed rate f = 0.2 ~ 0.25mm / r, and the turning depth a p =2mm.

3. The turning method of a thin-walled cylinder with reinforcing ribs on the inner surface as claimed in claim 1, characterized in that: When installing the tooling in step 2, the outer pressure plate (4) is placed on the upper end surface of the thin-walled cylinder, and the stopper on the inner circumferential surface of the outer pressure plate is clamped on the tooling pressure platform of the thin-walled cylinder; the upper end of the screw is inserted into the connecting hole on the outer pressure plate and tightened; the lower end of the screw is inserted into the screw hole of the slider located on the workbench of the vertical lathe.

4. The turning method of a thin-walled cylinder with reinforcing ribs on the inner surface as claimed in claim 1, characterized in that When finishing the inner surface of a thin-walled cylinder, the turning speed v = 20 ~ 30r / min, the feed rate f = 0.2 ~ 0.25mm / r, the turning depth of the first pass a p1 =0.65~0.8mm, second pass a p2 =0.2~0.35mm; and record the axial machining allowance of the inner surface reinforcement rib.

5. The turning method of a thin-walled cylinder with reinforcing ribs on the inner surface as claimed in claim 1, characterized in that: The bracket (7) is mounted on the workbench through the lathe pressure plate, and the bracket is aligned; the cylinder is sleeved on the sleeve matching surface of the bracket (7); the inner pressure plate (6) is placed on the upper end surface of the thin-walled cylinder, and the stopper on the outer circumferential surface of the inner pressure plate is clamped on the inner circumferential surface of the thin-walled cylinder; the upper end of the screw is installed in the connecting hole on the inner pressure plate, and the lower end of the screw is installed in the connecting hole on the bracket, and they are tightened.

6. The turning method of a thin-walled cylinder with reinforcing ribs on the inner surface as claimed in claim 1, characterized in that: When the thin-walled cylinder is cut as described in step 7, the thin-walled cylinder support is installed on a horizontal lathe, the top block bolt (9) of the cylinder support (8) is screwed to the minimum diameter, the rear end of the cylinder (2) is installed outside the cylinder support, the top block bolt is tightened to the inner wall of the cylinder, the cylinder is supported inside, and the other end is supported by the lathe tailstock to support the inner diameter of the cylinder.

7. The turning method of a thin-walled cylinder with reinforcing ribs on the inner surface as claimed in claim 1, characterized in that: The tooling for the outer circumference of the tooling press platform reserved for rough turning the outer cylindrical surface comprises an outer pressure plate (4); the inner diameter ΦD1 of the outer pressure plate is clearance-matched with the outer diameter of the tooling press platform, and the clearance is 0.5-0.7 mm.

8. The turning method of a thin-walled cylinder with reinforcing ribs on the inner surface as claimed in claim 1, characterized in that: The tooling press table reserved for rough turning of the outer cylindrical surface and the inner pressure tooling for the inner surface size after fine turning include an inner pressure plate (6) and a bracket (7); the outer diameter of the small end of the inner pressure plate is ΦD3, which matches the inner diameter size of the cylinder, and the matching clearance is 0.1-0.2mm; the upper end surface of the cylinder is a positioning surface; the end surface E formed by the outer diameter difference between the large end and the small end of the outer circumferential surface of the inner pressure plate matches the upper end surface of the cylinder, the flatness of the E end surface of the inner pressure plate is 0.05mm, and the parallelism with the upper end surface of the cylinder is 0.05mm, so as to ensure the roundness of the outer cylindrical surface; The diameter of the small diameter end of the bracket (7) is ΦD4, which matches the inner diameter of the cylinder, and the matching clearance is 0.1-0.2mm; the lower end face of the cylinder is used as the positioning surface; the end face H formed by the diameter difference of the circumferential surface of the bracket matches the lower end face of the cylinder; the flatness of the H end face is 0.05mm, and the parallelism with the lower end face of the cylinder is 0.05mm, ensuring the roundness of the outer cylindrical surface; the sharp corners need to be cleaned to prevent wear on the cylinder.

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