A processing method suitable for water-cooled hydraulic cylinder barrel

Abstract

The application provides a processing method suitable for a water-cooled hydraulic cylinder barrel, which comprises the stages of processing an inner cylinder barrel, processing an outer cylinder barrel and processing a cylinder bottom, and carries out a processing cylinder assembly step: welding the inner cylinder barrel and the cylinder bottom; radially clamping the inner cylinder barrel and coaxially turning the outer circle of the cylinder bottom; welding the outer cylinder barrel and the cylinder bottom, and welding the outer cylinder barrel and the inner cylinder barrel through a connecting ring; clamping the outer circle of the cylinder bottom and / or the inner hole of the inner cylinder barrel to turn the outer circle of the cylinder port welding position, and clamping the outer circle of the cylinder bottom to turn the first cylinder port stopper at the inner hole of the inner cylinder barrel. The application guarantees the coaxiality of the outer circle of the cylinder bottom and the inner cylinder barrel based on the inner cylinder barrel, and guarantees the coaxiality of the inner hole at the cylinder port of the cylinder assembly and the inner hole of the inner cylinder barrel based on the outer circle of the cylinder bottom, and the outer circle of the cylinder port welding position can avoid the outer cylinder barrel being welded through when welding the connecting ring due to the thin wall thickness of the welding position of the outer cylinder barrel caused by the second cylinder port stopper.

Description

Technical Field

[0001] This invention relates to a method for machining hydraulic cylinder barrels, and more specifically, to a method for machining water-cooled hydraulic cylinder barrels. Background Technology

[0002] A water-cooled hydraulic cylinder is a type of hydraulic cylinder that uses a water cooling system to control its operating temperature. To ensure good cooling performance, the cylinder body is generally designed with a water cooling channel. For hydraulic cylinders that are commonly used in heavy-pressure environments, the water cooling channel needs to be integrated into the cylinder barrel as a single unit. For example, in existing technology, the water cooling channel is usually located between the inner and outer cylinder barrels, both of which are welded to the cylinder bottom to form a cylinder assembly. The cylinder assembly connects the inner and outer cylinder barrels at the cylinder port via a connecting ring.

[0003] Currently, the existing manufacturing process for hydraulic cylinders with an integrated water cooling channel is as follows: the inner cylinder is welded to the cylinder bottom, the outer cylinder is then welded to the cylinder bottom, and finally the connecting pipe is welded between the inner and outer cylinders to process the cylinder body parts into a cylinder body assembly.

[0004] The aforementioned manufacturing process will face some challenges: Firstly, when welding the connecting ring between the inner and outer cylinder barrels, the welding heat input will cause deformation of the inner and outer walls at the cylinder port of the cylinder assembly. It is difficult to guarantee the machining dimensional accuracy at the cylinder port of the cylinder assembly and the coaxiality of the inner bore of the inner cylinder barrel, which will affect the subsequent guide assembly and the overall hydraulic cylinder assembly quality.

[0005] Secondly, because the inner or outer cylinder needs to be fitted with a stop for the welded connecting ring, the wall thickness at the weld between the inner or outer cylinder and the connecting ring is relatively thin. When welding at this position, it is easy to be welded through, making it difficult to guarantee the outer diameter and machining quality.

[0006] In order to solve the above problems, people have been seeking an ideal technological solution. Summary of the Invention

[0007] The purpose of this invention is to address the shortcomings of existing technologies by providing a processing method suitable for water-cooled hydraulic cylinders, ensuring the coaxiality of the cylinder bottom assembly during processing, and preventing the inner and outer cylinders from being welded through during the welding of the connecting ring.

[0008] To achieve the above objectives, the technical solution adopted by the present invention includes a step of machining cylinder block components and a step of machining cylinder block assembly, wherein the step of machining cylinder block components includes the following stages: The stages of machining the inner cylinder: coaxially machine the inner hole and outer circle, and turn the first bevel at the bottom of the outer circle; The machining stages of the outer cylinder barrel are as follows: the inner hole and the outer circle are machined coaxially, the second cylinder bottom bevel is machined on the outer circle, the second cylinder mouth stop is machined on the inner circle, and when machining the outer circle, a allowance is reserved for machining the outer circle of the cylinder mouth weld, the outer diameter of the outer circle of the cylinder mouth weld is larger than the outer diameter of the outer cylinder barrel outer circle. The machining process for the cylinder bottom involves: machining the first cylinder bottom bevel, machining the second cylinder bottom bevel, and machining the outer diameter, while leaving a margin for the outer diameter of the cylinder bottom. The machining steps of the cylinder block assembly include: welding the first cylinder bottom bevel and the first cylinder bottom bevel; radially clamping the inner cylinder and turning and coaxially turning the outer circle of the cylinder bottom; welding the outer cylinder to the cylinder bottom through the second cylinder bottom bevel and the second cylinder bottom bevel, and welding the outer cylinder to the inner cylinder through the connecting ring in the second cylinder mouth stop; clamping the outer circle of the cylinder bottom and / or the inner hole of the inner cylinder to turn the outer circle of the cylinder mouth weld, and clamping the outer circle of the cylinder bottom to turn the first cylinder mouth stop at the inner hole of the inner cylinder.

[0009] Based on the above, in the machining stage of the inner cylinder, the inner hole is rough bored and supported, the two ends are positioned and chamfered, the outer circle is turned and the first mounting hole on the outer circle is turned; the inner hole is fine bored with chamfer positioning; the first mounting hole is mounted and the first cylinder bottom bevel is turned.

[0010] Based on the above, during the machining of the inner cylinder, the inner hole is precision bored and then precision machined to meet the surface roughness requirements of the inner hole.

[0011] Based on the above, in the machining stage of the outer cylinder, the inner hole is rough bored and supported, the bottom bevel of the second cylinder is turned, the positioning chamfers at both ends are repaired, the outer circle is turned and the second mounting socket on the outer circle is turned, the outer diameter of the second mounting socket is larger than the outer diameter of the outer circle of the outer cylinder; the inner hole is fine bored with chamfer positioning; the second mounting socket is set, and the stop of the second cylinder mouth is turned.

[0012] Based on the above, in the machining cylinder assembly step, after welding the outer cylinder barrel to the cylinder bottom, clamp the outer circle of the cylinder bottom and / or the inner hole of the inner cylinder barrel to machine the second bracket recess.

[0013] Based on the above, in the machining cylinder assembly step, after machining the outer circle of the cylinder bottom, the second cylinder bottom bevel and the second cylinder bottom bevel are first spot welded, then the connecting ring is welded to the inner cylinder and the outer cylinder respectively in the second cylinder stop, and finally the second cylinder bottom bevel and the second cylinder bottom bevel are welded.

[0014] Based on the above, in the process of machining the cylinder assembly, after welding the first cylinder bottom bevel and the first cylinder bottom bevel, there is a first weld, and the first weld is machined after welding; after welding the second cylinder bottom bevel and the second cylinder bottom bevel, there is a second weld, and the second weld is machined after welding.

[0015] Based on the above, during the machining of the cylinder bottom, after turning the outer circle, the flat part of the cylinder bottom is milled, and the cylinder bottom hole is drilled.

[0016] Based on the above, in the process of processing cylinder block parts, the stage of processing each cylinder block part also includes blanking, tempering and flattening, wherein the inner cylinder and the outer cylinder are blanked and cut to the required length, and the cylinder bottom is blanked and cut to the required length.

[0017] Based on the above, in the process of machining cylinder block parts, after the lathe machining is completed, the cylinder block assembly is shot blasted and then coated with primer.

[0018] This invention has substantial features and advancements compared to existing technologies. Specifically, this invention uses the inner cylinder as a reference to ensure the coaxiality of the outer circle of the cylinder bottom with the inner cylinder. Furthermore, it uses the outer circle of the cylinder bottom as a reference to ensure the coaxiality of the inner hole at the cylinder port of the cylinder assembly (i.e., the inner cylinder port) with the inner cylinder. This ensures the assembly quality when assembling the guide sleeve, piston assembly, and overall hydraulic cylinder. In addition, the second cylinder port stop of the outer cylinder facilitates the subsequent welding of the connecting ring. The outer circle of the outer cylinder port weld joint avoids the thin wall thickness of the outer cylinder at the welding joint due to the second cylinder port stop, which could lead to the weld being burned through when welding the connecting ring.

[0019] Meanwhile, the first and second sockets facilitate the processing of inner and outer cylinder parts, achieving high-precision and high-coaxiality processing; the spot welding method for connecting the outer cylinder to the cylinder bottom effectively controls the welding gap between the connecting ring and the inner and outer cylinders; moreover, the present invention can effectively handle the first and second welds. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall processing structure of the present invention; Figure 2 This is a schematic diagram of the machining structure of the inner cylinder of the present invention; Figure 3 This is a schematic diagram of the machining structure of the outer cylinder of the present invention; Figure 4 This is a schematic diagram of the cylinder bottom machining structure of the present invention; In the figure, the attached reference numerals are: Inner cylinder 1, first cylinder bottom bevel 11, first cylinder mouth stop 12, first support recess 13; Outer cylinder 2, second cylinder bottom bevel 21, second cylinder mouth stop 22, second support recess 23, outer circle of cylinder mouth weld 24; Cylinder bottom 3, first cylinder bottom bevel 31, second cylinder bottom bevel 32, cylinder bottom flat part 33, cylinder bottom hole position 34; Connecting ring 4; First weld 51, second weld 52, water cooling channel 501. Detailed Implementation

[0021] The technical solution of the present invention will be further described in detail below through specific embodiments.

[0022] Example 1 like Figures 1-4 As shown, the processing method for water-cooled hydraulic cylinders in this embodiment includes a cylinder body component processing step S1 and a cylinder body assembly processing step S2. The cylinder body component processing step S1 is used to process cylinder body components, including an inner cylinder 1, an outer cylinder 2, and a cylinder bottom 3. The cylinder body assembly processing step S2 is used to process the inner cylinder 1, the outer cylinder 2, the cylinder bottom 3, and the connecting ring 4 to form a cylinder body assembly with a water cooling channel 501.

[0023] The machining step S1 of the cylinder block components includes the following stages: machining the inner cylinder barrel 1, machining the outer cylinder barrel 2, and machining the cylinder bottom 3. These three stages of machining the cylinder block components do not need to be performed in a specific order.

[0024] like Figure 2 As shown, during the machining of the inner cylinder 1, the inner hole and outer circle of the inner cylinder 1 are machined coaxially to ensure the coaxiality of the inner hole and outer circle of the inner cylinder 1. Furthermore, a first cylinder bottom bevel 11 is machined at the outer circle of the bottom end of the inner cylinder 1 for subsequent welding to the cylinder bottom 3.

[0025] like Figure 3 As shown, during the machining of the outer cylinder 2, the inner hole and outer circle of the outer cylinder 2 are machined coaxially to ensure the coaxiality of the inner hole and outer circle of the outer cylinder 2. A second cylinder bottom bevel 21 is machined at the outer circle of the bottom end of the outer cylinder 2 for subsequent welding with the cylinder bottom 3. At the same time, a second cylinder mouth stop 22 is machined inside the cylinder mouth end of the outer cylinder 2 for subsequent assembly of the connecting ring 4.

[0026] In this embodiment, since a first cylinder mouth stop 12 needs to be machined at the end of the inner cylinder 1 to facilitate the installation of accessories such as guide sleeves, the stop for installing the connecting ring 4 is set at the second cylinder mouth stop 22 position of the outer cylinder 2. Of course, in other embodiments, if the wall thickness of the inner cylinder 1 is sufficient, the stop for installing the connecting ring 4 can also be set at the cylinder mouth of the inner cylinder 1.

[0027] In addition, such as Figure 3 As shown, during the machining of the outer cylinder 2, when machining the outer diameter of the outer cylinder 2, a allowance is reserved for the outer diameter of the outer cylinder 2 so as to machine the outer diameter 24 of the cylinder opening weld. The outer diameter of the outer diameter 24 of the cylinder opening weld is larger than the outer diameter of the outer cylinder 2.

[0028] The outer circle 24 of the cylinder mouth weld is machined out for two purposes. First, it increases the wall thickness of the outer cylinder 2. The wall thickness of the outer cylinder 2 that is reduced due to the machining of the second cylinder mouth stop 22 can be compensated by the outer circle 24 of the cylinder mouth weld, preventing the outer cylinder 2 from being welded through due to insufficient wall thickness when welding the connecting ring 4. Second, the outer circle 24 of the cylinder mouth weld is used as a margin for the outer cylinder 2. After the connecting ring 4 is machined into the cylinder body assembly, the outer circle 24 of the cylinder mouth weld is machined to ensure the coaxiality of the outer circle (outer circle of outer cylinder 2) and the inner hole (inner hole of inner cylinder 1) at the cylinder mouth of the cylinder body assembly.

[0029] like Figure 4 As shown, during the machining of cylinder bottom 3, a first cylinder bottom bevel 31 is machined on cylinder bottom 3 to weld the inner cylinder barrel 1, and a second cylinder bottom bevel 32 is machined on cylinder bottom 3 to weld the outer cylinder barrel 2; moreover, the outer circle of cylinder bottom 3 is machined on cylinder bottom 3, and a allowance is reserved on the outer circle of cylinder bottom 3 during machining to facilitate subsequent machining and ensure the coaxiality of the outer circle of cylinder bottom 3 with the inner hole and outer circle of inner cylinder barrel 1.

[0030] like Figure 1 As shown, step S2 of machining the cylinder block assembly includes the following machining steps: S21, weld the first cylinder bottom bevel 11 and the first cylinder bottom bevel 31 to form the first weld 51, so as to weld the cylinder bottom 3 and the inner cylinder 1 together. After the welding cools, proceed to the next step.

[0031] S22, radially clamp the inner cylinder 1 and machine the outer circle of the cylinder bottom 3 coaxially to ensure the coaxiality of the outer circle of the cylinder bottom 3 with the inner hole and outer circle of the inner cylinder 1; specifically, the inner cylinder 1 can be radially clamped by supporting the inner hole of the inner cylinder 1 or clamping the outer circle of the inner cylinder 21.

[0032] S23, firstly, the outer cylinder 2 and the cylinder bottom 3 are welded together through the second cylinder bottom bevel 21 and the second cylinder bottom bevel 32 to form a second weld 52; secondly, the outer cylinder 2 and the inner cylinder 1 are welded together through the connecting ring 4 inside the second cylinder mouth stop 22; S23 can be performed either first and then second, or second and then first.

[0033] After S23 is completed, a water cooling channel 501 is formed between the inner cylinder 1, the outer cylinder 2, the cylinder bottom 3, and the connecting ring 4.

[0034] S24, clamping the outer circle of the cylinder bottom 3 and / or the inner hole of the inner cylinder 1 with the outer circle 24 of the cylinder opening weld, the outer circle of the cylinder bottom 3 and the inner hole of the inner cylinder 1 will not interfere with the outer circle 24 of the cylinder opening weld, so that the cylinder bottom 3 / inner cylinder 1 and the outer circle of the cylinder opening can be coaxial; clamping the outer circle of the cylinder bottom 3 with the first cylinder opening stop 12 of the inner hole of the inner cylinder 1, the outer circle of the cylinder bottom 3 will not interfere with the first cylinder opening stop 12, so that the inner hole of the inner cylinder 1 is coaxial with the inner hole of the inner cylinder 1 and the outer circle of the cylinder bottom 3. The first cylinder opening stop 12 is used to assemble guide sleeves and other accessories.

[0035] It is worth mentioning that in the cylinder block assembly machining step S2, the order of some process steps can be interchanged or performed simultaneously.

[0036] The principle of the machining method applicable to water-cooled hydraulic cylinder barrels in this application is as follows: Firstly, when machining the inner cylinder 1, ensure the coaxiality of the inner hole or outer circle of the inner cylinder 1, and use the inner hole or outer circle of the inner cylinder 1 as a reference to machine the outer circle of the cylinder bottom 3. This ensures the coaxiality of the outer circle of the cylinder bottom 3 and the inner cylinder 1. After welding the outer cylinder 2 onto the cylinder bottom 3 and welding the inner cylinder 1 and outer cylinder 2 together with the connecting ring 4, use the outer circle of the cylinder bottom 3 as a reference to machine the first cylinder port stop 12 of the inner cylinder 1. This ensures the coaxiality of the first cylinder port stop 12 at the cylinder port of the cylinder assembly (i.e., at the inner hole of the inner cylinder 1) with the inner hole of the inner cylinder 1. This also ensures the assembly quality when assembling the guide sleeve, piston assembly, and overall hydraulic cylinder.

[0037] Secondly, a second cylinder mouth stop 22 and an outer circle 24 of the cylinder mouth weld are respectively provided at the cylinder mouth of the outer cylinder 2. The second cylinder mouth stop 22 facilitates the subsequent welding of the connecting ring 4, and the outer circle 24 of the cylinder mouth weld can prevent the cylinder mouth of the outer cylinder 2 from being welded through when welding the connecting ring 4. After welding the connecting ring 4, the first cylinder mouth stop 12 is machined to prevent the cylinder mouth of the inner cylinder 1 from being welded through when welding the connecting ring 4.

[0038] Example 2 Based on Embodiment 1, in the machining stage of the inner cylinder 1, the inner hole and outer circle of the inner cylinder 1 are machined coaxially to ensure the coaxiality of the inner hole and outer circle of the inner cylinder 1. The specific solution is as follows: rough boring the inner hole of the inner cylinder 1 and supporting the inner hole, repairing the positioning chamfers at both ends, turning the outer circle and turning the first mounting recess 13 on the outer circle; clamping and positioning the inner cylinder 1 through the positioning chamfers at both ends to fine boring the inner hole; mounting the first mounting recess 13, and turning the first cylinder bottom bevel 11 through the first mounting recess 13.

[0039] Furthermore, in the machining stage of the inner cylinder 1, after precision boring of the inner hole, the inner cylinder 1 can be positioned by clamping and positioning with chamfers at both ends, and the inner hole surface can be precision machined, such as by scraping, rolling or burning the inner hole surface, to meet the surface roughness requirements and meet the needs of subsequent machining and assembly.

[0040] In this invention, "support socket" refers to a cylindrical surface with high precision and good surface quality that is specially machined at a certain position on the outer circle of a shaft-type workpiece during lathe machining. It is used to provide a support point for the radial support and to provide support for the machining of the shaft-type workpiece. The surface of the support socket has certain surface roughness requirements, for example, surface roughness ≤ Ra3.2μm.

[0041] Example 3 Based on Embodiment 1 or Embodiment 2, in the stage of machining the outer cylinder 2, the specific scheme for coaxially machining the inner hole and outer circle of the outer cylinder 2 to ensure the coaxiality of the inner hole and outer circle of the outer cylinder 2 is as follows: rough boring the inner hole of the outer cylinder 2 and supporting the inner hole, turning the second cylinder bottom bevel, repairing the positioning chamfers at both ends, turning the outer circle, turning the second mounting recess 23 on the outer circle, turning the outer circle 24 at the cylinder mouth weld, the outer diameter of the second mounting recess 23 is larger than the outer diameter of the outer circle of the outer cylinder 2; clamping and positioning the outer cylinder 2 through the positioning chamfers at both ends, and fine boring the inner hole; mounting the second mounting recess 23, and turning the second cylinder mouth stop 22 through the second mounting recess 23.

[0042] The second bottom bevel 21 and the positioning chamfer at the bottom of the cylinder are both located on the outer circle of the bottom of the cylinder, and the two coincide. Figure 3 As shown ( Figure 3 The positioning chamfer at the middle cylinder opening is not shown, but is actually located on the outer circle 24 of the cylinder opening weld. The second cylinder bottom bevel 21 can be used as a positioning chamfer. When repairing the positioning chamfers at both ends, the second cylinder bottom bevel 21 should be finely repaired.

[0043] In the cylinder assembly machining step, after welding the outer cylinder 2 to the cylinder bottom 3, clamp the outer circle of the cylinder bottom 3 and / or the inner hole of the inner cylinder 1 to machine the second bracket recess 23 (and machine the outer circle 24 of the cylinder opening weld, and machine the positioning chamfer at the cylinder opening on the outer circle 24 of the cylinder opening weld) to ensure that the outer circle of the outer cylinder 2 is flat.

[0044] Example 4 Based on Example 1, in the cylinder assembly machining step S2, after machining the outer circle of the cylinder bottom 3, the second cylinder bottom bevel 21 and the second cylinder bottom bevel 32 are first spot welded, and then the connecting ring 4 is welded to the inner cylinder 1 and the outer cylinder 2 respectively in the second cylinder stop 22. Finally, the second cylinder bottom bevel 22 and the second cylinder bottom bevel 32 are welded.

[0045] In this embodiment, after the relative positions of the outer cylinder 2, inner cylinder 1, and cylinder bottom 3 are accurately determined, the outer cylinder 2 and cylinder bottom 3 are first connected by spot welding. Then, the inner cylinder 1 and outer cylinder 2 are welded and fixed at the cylinder port of the cylinder assembly by the connecting ring 4. Finally, the outer cylinder 2 and cylinder bottom 3 are completely welded and fixed, which can effectively control the welding gap between the connecting ring 4 and the inner cylinder 1 and outer cylinder 2.

[0046] Example 5 Based on Example 1, in the cylinder assembly processing step S2, after welding the first cylinder bottom bevel 11 and the first cylinder bottom bevel 31, there is a first weld 51. After welding, the first weld 51 is machined before installing the outer cylinder 2. After welding the second cylinder bottom bevel 21 and the second cylinder bottom bevel 32, there is a second weld 52. After welding, the second weld 52 is machined.

[0047] Example 6 Based on Example 1, in the cylinder bottom 3 stage, after turning the outer circle, the cylinder bottom flat part 33 is milled out and the cylinder bottom hole 34 is drilled out.

[0048] Example 7 Based on Embodiment 1, Embodiment 2, or Embodiment 3, in step S2 of machining cylinder block components, the stage of machining each cylinder block component further includes blanking, tempering (heat treatment), and flattening. Specifically, inner cylinder barrel 1 and outer cylinder barrel 2 are cut into tubular material and sawn to the required length, while cylinder bottom 3 is cut into bar material and sawn to the required length. For example, based on Embodiment 2 or Embodiment 3, blanking, tempering, and flattening can be performed before rough boring; however, if the cylinder wall allowance is large, the tempering heat treatment can be moved to after rough boring.

[0049] Furthermore, in step S2 of machining the cylinder block components, after lathe machining, the cylinder block assembly undergoes shot blasting and primer spraying. Furthermore, in step S2 of machining cylinder block parts, after the lathe machining is completed, other cylinder block accessories, such as water pipe connectors, are installed.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of the present invention or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solutions of the present invention, and all such modifications and substitutions should be covered within the scope of the technical solutions claimed in the present invention.

Claims

1. A machining method suitable for water-cooled hydraulic cylinder barrels, characterized in that, This includes the steps of machining cylinder block components and machining cylinder block assemblies, wherein the steps of machining cylinder block components include the following stages: The machining stages of the inner cylinder are as follows: coaxial machining of the inner hole and outer circle, and turning the first cylinder bottom bevel on the outer circle; wherein, in the machining stage of the inner cylinder, rough boring of the inner hole and supporting the inner hole, repairing the positioning chamfers at both ends, turning the outer circle and turning the first support recess on the outer circle; chamfering and positioning fine boring of the inner hole; setting the first support recess, and turning the first cylinder bottom bevel; The machining stages of the outer cylinder barrel are as follows: coaxial machining of the inner hole and outer circle; turning the second cylinder bottom bevel on the outer circle; turning the second cylinder mouth stop on the inner circle; leaving allowance when turning the outer circle to machine the outer circle of the cylinder mouth weld, wherein the outer diameter of the outer circle of the cylinder mouth weld is larger than the outer diameter of the outer cylinder barrel; wherein, in the machining stage of the outer cylinder barrel, rough boring of the inner hole and supporting the inner hole; turning the second cylinder bottom bevel; repairing the positioning chamfers at both ends; turning the outer circle and turning the second support recess on the outer circle, wherein the outer diameter of the second support recess is larger than the outer diameter of the outer cylinder barrel; chamfering and positioning of the inner hole and fine boring; setting the second support recess; turning the second cylinder mouth stop; The machining process for the cylinder bottom involves: machining the first cylinder bottom bevel, machining the second cylinder bottom bevel, and machining the outer diameter, while leaving a margin for the outer diameter of the cylinder bottom. The machining steps of the cylinder assembly include: welding the first cylinder bottom bevel and the first cylinder bottom bevel; radially clamping the inner cylinder and turning and coaxially turning the outer circle of the cylinder bottom; welding the outer cylinder to the cylinder bottom through the second cylinder bottom bevel and the second cylinder bottom bevel, and welding the outer cylinder to the inner cylinder through the connecting ring in the second cylinder mouth stop; clamping the outer circle of the cylinder bottom and / or the inner hole of the inner cylinder to turn the outer circle of the cylinder mouth weld, clamping the outer circle of the cylinder bottom to turn the first cylinder mouth stop at the inner hole of the inner cylinder; wherein, in the machining steps of the cylinder assembly, after turning the outer circle of the cylinder bottom, the second cylinder bottom bevel and the second cylinder bottom bevel are first spot welded, then the connecting ring is welded to the inner cylinder and the outer cylinder respectively in the second cylinder mouth stop, and finally the second cylinder bottom bevel and the second cylinder bottom bevel are welded.

2. The machining method for water-cooled hydraulic cylinder barrels according to claim 1, characterized in that, During the machining of the inner cylinder, the inner hole is precision bored and then precision machined to meet the surface roughness requirements of the inner hole.

3. The machining method for water-cooled hydraulic cylinder barrels according to claim 1, characterized in that, In the machining cylinder assembly step, after welding the outer cylinder barrel to the cylinder bottom, clamp the outer circle of the cylinder bottom and / or the inner hole of the inner cylinder barrel to machine the second bracket recess.

4. The machining method for water-cooled hydraulic cylinder barrels according to claim 1, characterized in that, In the machining cylinder assembly step, after welding the first cylinder bottom bevel and the first cylinder bottom bevel, there is a first weld, and the first weld is machined after welding; after welding the second cylinder bottom bevel and the second cylinder bottom bevel, there is a second weld, and the second weld is machined after welding.

5. The machining method for water-cooled hydraulic cylinder barrels according to claim 1, characterized in that, During the machining of the cylinder bottom, after turning the outer diameter, the flat part of the cylinder bottom is milled, and the cylinder bottom hole is drilled.

6. The machining method for water-cooled hydraulic cylinder barrels according to claim 1, characterized in that, In the process of machining cylinder block parts, the stage of machining each cylinder block part also includes blanking, tempering and flattening, wherein the inner cylinder and the outer cylinder are cut into tubes and cut to the required length, and the cylinder bottom is cut into bars and cut to the required length.

7. The machining method for water-cooled hydraulic cylinder barrels according to claim 1, characterized in that, In the machining steps of the cylinder block components, after the lathe machining is completed, the cylinder block assembly is shot blasted and then coated with primer.

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