A hydraulic positioning fixture for an electrolytic cell electrode frame and its positioning method

Abstract

This invention discloses a hydraulic positioning fixture and method for electrolytic cell electrode frames, belonging to the field of electrolytic cell electrode frame processing technology. The positioning fixture includes: a support base; several outer hydraulic clamping mechanisms connected to the surface of the support base and equidistantly distributed in a ring around the axis of the support base; several inner hydraulic clamping mechanisms connected to the surface of the support base and equidistantly distributed in a ring around the axis of the support base; the inner hydraulic clamping mechanisms are located inside the outer hydraulic clamping mechanisms. The inner hydraulic clamping mechanisms support the electrode frame workpiece and clamp the inner side of the electrode frame workpiece when processing the outer side; the outer hydraulic clamping mechanisms clamp the outer side when processing the inner side of the electrode frame workpiece. Specifically, the positioning is to clamp the inner side first, process the outer side, then clamp the outer side again, and process the inner side, thereby enabling better alignment and positioning when processing the inner, outer, front, and back sides of the electrode frame.

Description

Technical Field

[0001] This invention relates to the field of electrolytic cell electrode frame processing technology, and in particular to a hydraulic positioning fixture and positioning method for electrolytic cell electrode frames. Background Technology

[0002] Hydrogen energy, as an ideal alternative to fossil fuels, has attracted widespread attention. Electrolysis of water is one of the most promising methods for hydrogen production, offering simplicity, efficiency, and low emissions, thus possessing broad application prospects.

[0003] Electrolyzers are key equipment for hydrogen production through water electrolysis, and electrode frames are crucial components of electrolyzers. In related technologies, the electrode frame has a circular structure with a set of alkaline inlet channels running through the front and back of the electrode frame along the bottom ring direction.

[0004] When using the pole frame, it needs to be processed. The positioning and alignment before processing is very important. However, since the pole frame is an irregularly shaped part, it is not easy to position and there is a problem of alignment. Summary of the Invention

[0005] To address the problems of existing technologies, this invention provides a hydraulic positioning fixture for an electrolytic cell pole frame and its positioning method.

[0006] On one hand, a hydraulic positioning fixture for an electrolytic cell electrode frame is provided, the positioning fixture comprising:

[0007] Support base;

[0008] Several external hydraulic clamping mechanisms are connected to the surface of the support base and are distributed in a ring at equal intervals with the axis of the support base as the center.

[0009] Several inner hydraulic clamping mechanisms are connected to the surface of the support base and are distributed in a ring at equal intervals with the axis of the support base as the center.

[0010] The inner hydraulic clamping mechanism is located inside the outer hydraulic clamping mechanism.

[0011] Furthermore, the inner hydraulic clamping mechanism includes: an inner hydraulic clamping support mechanism and an inner hydraulic clamping positioning mechanism.

[0012] Furthermore, each of the external hydraulic clamping mechanisms includes:

[0013] A first connecting plate is connected to the surface of the support base;

[0014] An auxiliary support cylinder is connected to the surface of the first connecting plate;

[0015] An outer clamping cylinder is connected to the surface of the first connecting plate;

[0016] The outer clamping block is connected to the output end of the outer clamping cylinder; the outer clamping block is located directly above the auxiliary support cylinder.

[0017] Furthermore, the inner hydraulic clamping support mechanism includes:

[0018] The second connecting plate is connected to the surface of the support base;

[0019] The first inner clamping cylinder is connected to the surface of the second connecting plate;

[0020] The first inner clamping block is connected to the output end of the first inner clamping cylinder;

[0021] A support block is connected to the surface of the second connecting plate, and the first inner clamping block is located directly above the support block;

[0022] The top of the support block is provided with a first first-order support surface and a first second-order support surface in sequence from the inside to the outside of the support base, and the height of the first first-order support surface is higher than the height of the first second-order support surface.

[0023] Furthermore, the inner hydraulic clamping and positioning mechanism includes:

[0024] The third connecting plate is connected to the surface of the support base;

[0025] The second inner clamping cylinder is connected to the surface of the third connecting plate;

[0026] The second inner clamping block is connected to the output end of the second inner clamping cylinder;

[0027] A positioning block is connected to the surface of the third connecting plate, and the second inner clamping block is located directly above the positioning block;

[0028] The top of the positioning block is provided with a centering block, a first support protrusion and a second support protrusion in sequence from the inside to the outside of the support base.

[0029] The height of the centering block is higher than the height of the first support protrusion, and the height of the first support protrusion is higher than the height of the second support protrusion;

[0030] The sidewall of the centering block facing the outside of the support base is a first-order centering surface, the top of the first support protrusion is a second first-order support surface, the sidewall of the first support protrusion facing the outside of the support base is a second-order centering surface, and the top of the second support protrusion is a second second-order support surface.

[0031] Furthermore, the number of the outer hydraulic clamping mechanism and the inner hydraulic clamping mechanism are the same, and they are arranged alternately.

[0032] Furthermore, there are twelve of each of the outer hydraulic clamping mechanisms and the inner hydraulic clamping mechanisms.

[0033] Furthermore, there are three inner hydraulic clamping and positioning mechanisms, which are evenly distributed on the surface of the support base;

[0034] There are nine inner hydraulic clamping support mechanisms, which are evenly distributed in groups of three between two adjacent inner hydraulic clamping positioning mechanisms.

[0035] On the other hand, a method for positioning an electrolytic cell electrode frame is provided, wherein the positioning is achieved using a hydraulic positioning fixture for the electrolytic cell electrode frame, the method comprising:

[0036] S1: The hoisted workpiece is lowered onto the outer hydraulic clamping mechanism and the inner hydraulic clamping mechanism;

[0037] S2: The inner hydraulic clamping mechanism supplies oil to press the inner side of the workpiece and support the bottom of the workpiece, and begins to process the outer side of the workpiece;

[0038] S3: The inner hydraulic clamping mechanism relaxes, the outer hydraulic clamping mechanism supplies oil to clamp the outer side of the workpiece, and the inner side of the workpiece is processed.

[0039] Furthermore, the method includes first-order front-side positioning and second-order reverse-side positioning;

[0040] During the first-order frontal positioning, S2 specifically includes:

[0041] The inner bottom of the workpiece is supported by placing it on the first sequential support surface of the support block of the inner hydraulic clamping support mechanism and the second sequential support surface of the positioning block of the inner hydraulic clamping positioning mechanism, and the workpiece is centered by the first sequential centering surface of the positioning block of the inner hydraulic clamping positioning mechanism.

[0042] The first inner clamping cylinder of the inner hydraulic clamping support mechanism and the second inner clamping cylinder of the inner hydraulic clamping positioning mechanism are supplied with oil, and the top of the inner side of the workpiece is clamped by the first inner clamping block and the second inner clamping block, and the outer side of the workpiece is processed from the front.

[0043] During the first-order frontal positioning, S3 specifically includes:

[0044] The first inner clamping cylinder and the second inner clamping cylinder are unloaded and released, and the outer clamping cylinder of the outer hydraulic clamping mechanism is supplied with oil to press the outer side of the workpiece, and the front processing of the inner side of the workpiece begins;

[0045] In the second-order reverse positioning, S2 specifically includes:

[0046] The bottom of the machined front of the workpiece is placed on the first and second sequence support surfaces of the support block of the inner hydraulic clamping support mechanism and the second sequence support surfaces of the positioning block of the inner hydraulic clamping positioning mechanism for support, and the workpiece is centered by the second sequence centering surface of the positioning block of the inner hydraulic clamping positioning mechanism on the first sequence machined stop annular surface.

[0047] The first inner clamping cylinder and the second inner clamping cylinder are supplied with oil, and the top of the inner side of the workpiece is clamped by the first inner clamping block and the second inner clamping block, and the outer side of the workpiece is processed from the reverse side.

[0048] In the second-order reverse positioning, S3 specifically includes:

[0049] The first inner clamping cylinder and the second inner clamping cylinder unload oil and relax, while the outer clamping cylinder of the outer hydraulic clamping mechanism supplies oil to press the outer side of the workpiece, and the reverse side of the workpiece is processed.

[0050] The beneficial effects of the technical solution provided by the embodiments of the present invention are as follows: In the present invention, a plurality of outer hydraulic clamping mechanisms and a plurality of inner hydraulic clamping mechanisms are provided on the support base. The plurality of outer hydraulic clamping mechanisms and the plurality of inner hydraulic clamping mechanisms are all distributed in a ring at equal intervals with the axis of the support base as the center. The inner hydraulic clamping mechanism is used to support the pole frame workpiece and clamp the inner side of the pole frame workpiece when processing the outer side of the pole frame workpiece; the outer hydraulic clamping mechanism is used to clamp the outer side when processing the inner side of the pole frame workpiece. Specifically, the positioning is to clamp the inner side first, process the outer side, then clamp the outer side and process the inner side, so as to better align and position when processing the inner side, outer side, front and back of the pole frame. Attached Figure Description

[0051] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0052] Figure 1 This is a schematic diagram of the structure of a hydraulic positioning fixture for an electrolytic cell electrode frame provided by the present invention.

[0053] Figure 2 This is a diagram showing the usage state of a hydraulic positioning fixture for an electrolytic cell electrode frame provided by the present invention;

[0054] Figure 3 This is a schematic diagram of the structure of an external hydraulic clamping mechanism provided by the present invention;

[0055] Figure 4 This is a schematic diagram of the structure of an inner hydraulic clamping support mechanism provided by the present invention;

[0056] Figure 5 This is a schematic diagram of the structure of an inner hydraulic clamping and positioning mechanism provided by the present invention.

[0057] Reference numerals: 1-Support base; 2-Outer hydraulic clamping mechanism; 3-Inner hydraulic clamping support mechanism; 4-Inner hydraulic clamping positioning mechanism; 5-First connecting plate; 6-Auxiliary support cylinder; 7-Outer clamping cylinder; 8-Outer clamping block; 9-Second connecting plate; 10-First inner clamping cylinder; 11-First inner clamping block; 12-Support block; 13-First sequential support surface; 14-First and second sequential support surface; 15-Third connecting plate; 16-Second inner clamping cylinder; 17-Second inner clamping block; 18-Positioning block; 19-Centering block; 20-First support protrusion; 21-Second support protrusion; 22-First sequential centering surface; 23-Second first sequential support surface; 24-Second sequential centering surface; 25-Second second sequential support surface. Detailed Implementation

[0058] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0059] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0060] See Figure 1-5 An electrolytic cell electrode frame hydraulic positioning fixture includes a support base 1, several outer hydraulic clamping mechanisms and several inner hydraulic clamping mechanisms. The several outer hydraulic clamping mechanisms and several inner hydraulic clamping mechanisms are all connected to the surface of the support base 1 and are distributed in a ring at equal intervals with the axis of the support base 1 as the center. The inner hydraulic clamping mechanisms are located inside the outer hydraulic clamping mechanisms.

[0061] The inner hydraulic clamping mechanism is used to support the pole frame workpiece and clamp the inner side of the pole frame workpiece when machining the outer side of the pole frame workpiece; the outer hydraulic clamping mechanism is used to clamp the outer side when machining the inner side of the pole frame workpiece. Specifically, the positioning is to clamp the inner side first, then machine the outer side, then clamp the outer side and machine the inner side, so that the alignment and positioning can be better found when machining the inner side, outer side, front and back of the pole frame.

[0062] Furthermore, the inner hydraulic clamping mechanism includes: an inner hydraulic clamping support mechanism 3 and an inner hydraulic clamping positioning mechanism 4. The inner hydraulic clamping support mechanism 3 is used to clamp and support the inner side of the pole frame workpiece when processing the outer side of the pole frame workpiece, and the inner hydraulic clamping positioning mechanism 4 is used to center the workpiece annular surface when processing the pole frame workpiece, so that processing can be performed better.

[0063] In addition, the number of outer hydraulic clamping mechanisms 2 and inner hydraulic clamping mechanisms is the same, and they are arranged in an alternating manner; the number of outer hydraulic clamping mechanisms 2 and inner hydraulic clamping mechanisms can both be twelve; among them, there can be three inner hydraulic clamping positioning mechanisms 4 and nine inner hydraulic clamping support mechanisms 3, which are evenly distributed in groups of three between two adjacent inner hydraulic clamping positioning mechanisms 4.

[0064] It should be noted that the outer hydraulic clamping mechanism 2, the inner hydraulic clamping support mechanism 3, and the inner hydraulic clamping positioning mechanism 4 can all be detachably connected to the surface of the support base 1. When changing to different sizes of pole frame workpieces, they can be shared by shifting the outer hydraulic clamping mechanism 2, the inner hydraulic clamping support mechanism 3, and the inner hydraulic clamping positioning mechanism 4. The positions of the outer hydraulic clamping mechanism 2, the inner hydraulic clamping support mechanism 3, and the inner hydraulic clamping positioning mechanism 4 need to be pre-processed before the machining positioning is completed, which can meet the requirements of an inner hole ≥ 800mm and an outer diameter ≤ 2240mm. When changing the outer hydraulic clamping mechanism 2, the inner hydraulic clamping support mechanism 3, and the inner hydraulic clamping positioning mechanism 4 for different sizes of pole frame workpieces, firstly, all the internal oil pressure should be released, then the oil port plug at the position to be changed should be removed, then the outer hydraulic clamping mechanism 2, the inner hydraulic clamping support mechanism 3, and the inner hydraulic clamping positioning mechanism 4 should be removed and installed in the required position, and finally the oil port plug should be installed in the original position of the oil port.

[0065] Furthermore, the outer hydraulic clamping mechanism 2 includes: a first connecting plate 5, an auxiliary support cylinder 6, an outer clamping cylinder 7, and an outer clamping block 8. The first connecting plate 5 is detachably connected to the surface of the support base 1. The auxiliary support cylinder 6 is connected to the surface of the first connecting plate 5. The outer clamping cylinder 7 is connected to the surface of the first connecting plate 5. The outer clamping block 8 is connected to the output end of the outer clamping cylinder 7 and is located directly above the auxiliary support cylinder 6. The auxiliary support cylinder 6 is located inside the outer clamping cylinder 7. The auxiliary support cylinder 6 is used to provide auxiliary support when the outer hydraulic clamping mechanism 2 clamps the outer side of the pole frame workpiece. By supplying oil to the outer clamping cylinder 7, the outer clamping block 8 is driven to clamp the outer surface of the pole frame workpiece.

[0066] The inner hydraulic clamping support mechanism 3 includes: a second connecting plate 9, a first inner clamping cylinder 10, a first inner clamping block 11, and a support block 12, which are detachably connected to the surface of the support base 1; the first inner clamping cylinder 10 is connected to the surface of the second connecting plate 9; the first inner clamping block 11 is connected to the output end of the first inner clamping cylinder 10; the support block 12 is connected to the surface of the second connecting plate 9, and the first inner clamping block 11 is located directly above the support block 12; the top of the support block 12 is provided with a first first-order support surface 13 and a first second-order support surface 14 in sequence from the inside to the outside of the support base 1, and the height of the first first-order support surface 13 is higher than the height of the first second-order support surface 14; the first inner clamping cylinder 10 is located inside the support block 12. Since the electrode frame workpiece needs to be processed on both sides during processing, the first sequential support surface 13 is used to support the electrode frame workpiece when processing the front side, and by supplying oil to the first inner clamping cylinder 10, it drives the first inner clamping block 11 to clamp the inner surface of the front side of the electrode frame workpiece; the first second sequential support surface 14 is used to support the front side of the processed electrode frame workpiece when processing the back side, and by supplying oil to the first inner clamping cylinder 10, it drives the first inner clamping block 11 to clamp the inner surface of the back side of the electrode frame workpiece.

[0067] The inner hydraulic clamping and positioning mechanism 4 includes: a third connecting plate 15, a second inner clamping cylinder 16, a second inner clamping block 17, and a positioning block 18. The third connecting plate 15 is detachably connected to the surface of the support base 1. The second inner clamping cylinder 16 is connected to the surface of the third connecting plate 15. The second inner clamping block 17 is connected to the output end of the second inner clamping cylinder 16. The positioning block 18 is connected to the surface of the third connecting plate 15. The second inner clamping block 17 is located directly above the positioning block 18, and the second inner clamping cylinder 16 is located inside the positioning block 18. The top of the positioning block 18... The support base 1 is provided with a centering block 19, a first support protrusion 20 and a second support protrusion 21 in sequence from the inside to the outside. The height of the centering block 19 is higher than the height of the first support protrusion 20, and the height of the first support protrusion 20 is higher than the height of the second support protrusion 21. The side wall of the centering block 19 facing the outside of the support base 1 is a first-order centering surface 22, the top of the first support protrusion 20 is a second first-order support surface 23, the side wall of the first support protrusion 20 facing the outside of the support base 1 is a second-order centering surface 24, and the top of the second support protrusion 20 is a second second-order support surface 25.

[0068] Among them, the first-order centering surface 22 is used to center the inner annular surface of the workpiece when machining the outer side of the front of the pole frame workpiece. At the same time, it cooperates with the first first-order support surface 13 and the first inner clamping block, and the second first-order support surface 23 and the second inner clamping block 17 to clamp the workpiece, so that the alignment and positioning can be better performed when machining the outer front.

[0069] In addition, the second-order centering surface 24 is used to center the first-order machined stop ring surface of the workpiece when machining the outer side of the reverse side of the pole frame workpiece. At the same time, it cooperates with the first second-order support surface 14 and the first inner clamping block 11, and the second second-order support surface 25 and the second inner clamping block 17 to clamp the workpiece, so that the alignment and positioning can be better performed when machining the outer reverse side.

[0070] The complete workflow of this invention can be as follows:

[0071] Step (1): The hoisted workpiece is lowered onto the outer hydraulic clamping mechanism 2 and the inner hydraulic clamping mechanism.

[0072] Step (2): Place the inner bottom of the workpiece on the first sequential support surface 13 of the support block 12 of the inner hydraulic clamping support mechanism 3 and the second sequential support surface 23 of the positioning block 18 of the inner hydraulic clamping positioning mechanism 4 for support, and center the inner annular surface of the workpiece through the first sequential centering surface 22 of the positioning block 18 of the inner hydraulic clamping positioning mechanism 4; supply oil to the first inner clamping cylinder 10 of the inner hydraulic clamping support mechanism 3 and the second inner clamping cylinder 16 of the inner hydraulic clamping positioning mechanism 4, and clamp the inner top of the workpiece through the first inner clamping block 11 and the second inner clamping block 17, and start the front processing of the outer side of the workpiece.

[0073] Step (3): The first inner clamping cylinder 11 and the second inner clamping cylinder 16 are unloaded and released. The outer clamping cylinder 7 of the outer hydraulic clamping mechanism 2 is supplied with oil to press the outer side of the workpiece and start the front processing of the inner side of the workpiece.

[0074] Step (4): The hoisted workpiece is lowered onto the outer hydraulic clamping mechanism 2 and the inner hydraulic clamping mechanism, with the reverse side facing up.

[0075] Step (5): Place the bottom of the machined front side of the workpiece on the first second-order support surface 14 of the support block 12 of the inner hydraulic clamping support mechanism 3 and the second second-order support surface 25 of the positioning block 18 of the inner hydraulic clamping positioning mechanism 2 for support. The first inner clamping cylinder 10 and the second inner clamping cylinder 16 are supplied with oil to center the first-order machined stop annular surface of the workpiece through the second-order centering surface 24 of the positioning block 18 of the inner hydraulic clamping positioning mechanism 4. The top of the inner side of the workpiece is clamped through the first inner clamping block 11 and the second inner clamping block 17, and the outer side of the workpiece is machined from the reverse side.

[0076] Step (6): The first inner clamping cylinder 10 and the second inner clamping cylinder 16 are unloaded and released, and the outer clamping cylinder 7 of the outer hydraulic clamping mechanism 2 is supplied with oil to press the outer side of the workpiece and start the reverse processing of the inner side of the workpiece.

[0077] The clamping time is approximately 180 seconds (calculated from the time the workpiece is placed into the fixture), and the clamping force is 162 kN (7 MPa).

[0078] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0079] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An electrolyzer cell pole frame hydraulic positioning fixture, characterized in that, The positioning clamp comprises: a support seat (1); a plurality of outer hydraulic clamping mechanisms (2) connected to the surface of the support seat (1) and arranged in a ring shape at equal intervals with the axis of the support seat (1) as the center; a plurality of inner hydraulic clamping mechanisms connected to the surface of the support seat (1) and arranged in a ring shape at equal intervals with the axis of the support seat (1) as the center; the inner hydraulic clamping mechanisms are located inside the outer hydraulic clamping mechanisms; each of the outer hydraulic clamping mechanisms (2) comprises: a first connecting plate (5) connected to the surface of the support seat (1); an auxiliary support cylinder (6) connected to the surface of the first connecting plate (5); an outer clamping cylinder (7) connected to the surface of the first connecting plate (5); an outer clamping block (8) connected to the output end of the outer clamping cylinder (7); the outer clamping block (8) is located directly above the auxiliary support cylinder (6); the inner hydraulic clamping mechanism comprises an inner hydraulic clamping support mechanism (3) and an inner hydraulic clamping positioning mechanism (4); the inner hydraulic clamping support mechanism (3) comprises: a second connecting plate (9) connected to the surface of the support seat (1); a first inner clamping cylinder (10) connected to the surface of the second connecting plate (9); a first inner clamping block (11) connected to the output end of the first inner clamping cylinder (10); a support block (12) connected to the surface of the second connecting plate (9), and the first inner clamping block (11) is located directly above the support block (12); the top of the support block (12) is sequentially provided with a first primary support surface (13) and a second primary support surface (14) from the inside to the outside of the support seat (1), and the height of the first primary support surface (13) is higher than that of the second primary support surface (14); the inner hydraulic clamping positioning mechanism (4) comprises: a third connecting plate (15) connected to the surface of the support seat (1); a second inner clamping cylinder (16) connected to the surface of the third connecting plate (15); a second inner clamping block (17) connected to the output end of the second inner clamping cylinder (16); a positioning block (18) connected to the surface of the third connecting plate (15), and the second inner clamping block (17) is located directly above the positioning block (18); the top of the positioning block (18) is sequentially provided with a centering block (19), a first support protrusion (20) and a second support protrusion (21) from the inside to the outside of the support seat (1); the height of the centering block (19) is higher than that of the first support protrusion (20), and the height of the first support protrusion (20) is higher than that of the second support protrusion (21); the side wall of the centering block (19) facing the outside of the support seat (1) is a primary centering surface (22), the top of the first support protrusion (20) is a second primary support surface (23), the side wall of the first support protrusion (20) facing the outside of the support seat (1) is a secondary centering surface (24), and the top of the second support protrusion (21) is a second secondary support surface (25).

2. The electrolyzer cell pole frame hydraulic positioning fixture of claim 1, wherein, The number of the outer hydraulic clamping mechanisms (2) and the inner hydraulic clamping mechanisms is the same, and the outer hydraulic clamping mechanisms (2) and the inner hydraulic clamping mechanisms are staggered.

3. The electrolyzer cell pole frame hydraulic positioning fixture of claim 1, wherein, The number of the outer hydraulic clamping mechanisms (2) and the inner hydraulic clamping mechanisms is twelve.

4. The electrolyzer cell pole frame hydraulic positioning fixture of claim 3, wherein, The inner hydraulic clamping positioning mechanisms (4) are three, and are evenly distributed on the surface of the support seat (1). The inner hydraulic clamping supporting mechanisms (3) are nine, and are evenly distributed between adjacent two inner hydraulic clamping positioning mechanisms (4) in groups of three.

5. A method of positioning an electrolyser cell polar frame with a hydraulic positioning clamp according to any one of claims 1-4, characterised in that, The method comprises: S1: hoisting the workpiece to fall on the outer hydraulic clamping mechanism (2) and the inner hydraulic clamping mechanism; S2: the inner hydraulic clamping mechanism supplies oil, tightens the inner side of the workpiece, and supports the lower side of the workpiece, and starts processing the outer side of the workpiece; S3: the inner hydraulic clamping mechanism is relaxed, the outer hydraulic clamping mechanism (2) supplies oil, tightens the outer side of the workpiece, and starts processing the inner side of the workpiece; The method comprises one sequence of front positioning and two sequences of back positioning; When one sequence of front positioning, S2 specifically comprises: Place the inner bottom of the workpiece on the first one sequence supporting surface (13) of the supporting block (12) of the inner hydraulic clamping supporting mechanism (3) and the second one sequence supporting surface (23) of the positioning block (18) of the inner hydraulic clamping positioning mechanism (4) for supporting, and center the inner annular surface of the workpiece through the one sequence centering surface (22) of the positioning block (18) of the inner hydraulic clamping positioning mechanism (4); The first inner clamping cylinder (10) of the inner hydraulic clamping supporting mechanism (3) and the second inner clamping cylinder (16) of the inner hydraulic clamping positioning mechanism (4) supply oil, and the first inner clamping block (11) and the second inner clamping block (17) clamp the inner top of the workpiece, and start processing the outer side of the workpiece; When one sequence of front positioning, S3 specifically comprises: The first inner clamping cylinder (10) and the second inner clamping cylinder (16) are unloaded and relaxed, the outer clamping cylinder (7) of the outer hydraulic clamping mechanism (2) supplies oil, tightens the outer side of the workpiece, and starts processing the inner side of the workpiece; When two sequences of back positioning, S2 specifically comprises: Place the processed front bottom of the workpiece on the first two sequence supporting surface (14) of the supporting block (12) of the inner hydraulic clamping supporting mechanism (3) and the second two sequence supporting surface (25) of the positioning block (18) of the inner hydraulic clamping positioning mechanism (4) for supporting, and center the one sequence processed stop ring annular surface of the workpiece through the two sequence centering surface (24) of the positioning block (18) of the inner hydraulic clamping positioning mechanism (4); The first inner clamping cylinder (10) and the second inner clamping cylinder (16) supply oil, and the first inner clamping block (11) and the second inner clamping block (17) clamp the inner top of the workpiece, and start processing the outer side of the workpiece; When two sequences of back positioning, S3 specifically comprises: The first inner clamping cylinder (10) and the second inner clamping cylinder (16) are unloaded and relaxed, the outer clamping cylinder (7) of the outer hydraulic clamping mechanism (2) supplies oil, tightens the outer side of the workpiece, and starts processing the inner side of the workpiece.

Images