Double station machining fixture for radial diffusers and method

Abstract

The application discloses a double-station machining clamp for radial diffusers, which comprises a supporting seat, a first positioning part, a second positioning part and a pressing mechanism, wherein the supporting seat is used for being fixed on a machine tool; the first positioning part comprises a first positioning ring and a first angular positioning pin; the second positioning part comprises a second positioning ring and a second angular positioning pin, and the second positioning ring is circumferentially positioned relative to the first positioning ring; the pressing mechanism is arranged on the second positioning ring; the first positioning ring is used for supporting a first radial diffuser and coaxially arranging the first radial diffuser with the first positioning ring; the first end of the second positioning ring and the first positioning ring are used for clamping the first radial diffuser; the first angular positioning pin is used for circumferentially positioning the first radial diffuser; the second end of the second positioning ring is used for supporting a second radial diffuser; the second end of the second positioning ring and the pressing mechanism are used for clamping the second radial diffuser; and the second angular positioning pin is used for circumferentially positioning the second radial diffuser.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of aero-engine machining, in particular to a double-station machining clamp for a radial diffuser. Furthermore, the present application also relates to a machining method of the double-station machining clamp for the radial diffuser. BACKGROUND

[0002] The radial diffuser assembly is a rotating energy conversion part in the compressor part of an aero-engine. In order to sufficiently reduce energy conversion loss, control airflow direction, and increase air pressure, the part structure has 31 closed passages, the passage curved surface is generated by 25 groups of cross-section data, the passage length is 140 mm, and the cross-section area ratio is 1:10. Since the flow velocity and flow direction of the gas in the closed passage have a great influence on the use performance of the engine, the radial diffuser has a high requirement on the throat profile and surface roughness of the inlet passage of the passage.

[0003] Traditional milling cannot realize the structural characteristics of closed, variable cross-section, deep cavity, etc. The machining of the radial diffuser in the industry is a special process of forming electric spark. However, the closed, variable cross-section, deep and long cavity, large area, etc. of the radial diffuser belong to the difficult problems of electric machining. Due to the many limitations of the structure of the radial diffuser, it is difficult to machine the closed passage, which further leads to long machining time and low efficiency of the radial diffuser, which is not conducive to production. SUMMARY

[0004] The present application provides a double-station machining clamp for a radial diffuser and a machining method, to solve the technical problem of how to improve the machining efficiency of the radial diffuser and shorten the machining time of the radial diffuser.

[0005] According to one aspect of the present application, a double-station machining clamp for a radial diffuser is provided, which is used for sequentially clamping a first radial diffuser and a second radial diffuser in an axial direction, and comprises a support base, a first positioning part, a second positioning part, and a pressing mechanism, wherein the support base is used for being fixed on a machine tool; the first positioning part comprises a first positioning ring arranged on the support base and a first angular positioning pin arranged on the first positioning ring; the second positioning part comprises a second positioning ring coaxially arranged with the first positioning ring and a second angular positioning pin arranged on the second positioning ring, and the second positioning ring is circumferentially positioned relative to the first positioning ring; the pressing mechanism is arranged on the second positioning ring; the first positioning ring is used for supporting the first radial diffuser and making the first radial diffuser coaxial with the first positioning ring, a first end of the second positioning ring and the first positioning ring are used for clamping the first radial diffuser to axially position the first radial diffuser, the first angular positioning pin is used for circumferentially positioning the first radial diffuser, a second end of the second positioning ring is used for supporting the second radial diffuser and making the second radial diffuser coaxial with the second positioning ring, the second end of the second positioning ring and the pressing mechanism are used for clamping the second radial diffuser and axially positioning the second positioning ring, and the second angular positioning pin is used for circumferentially positioning the second radial diffuser.

[0006] Further, an inner circle of the first positioning ring is provided with a positioning bevel, and a first end of the second positioning ring is provided with a tapered ring matched with the positioning bevel.

[0007] Further, the support base comprises a bottom plate used for being connected with the machine tool and a guide base arranged on the bottom plate, and the first positioning ring is sleeved on the guide base and coaxial with the guide base.

[0008] Further, an end of the guide base towards the first positioning ring is provided with a plurality of guide columns, the guide columns are distributed at intervals in a circumferential direction of the guide base, the guide columns sequentially pass through the first positioning ring and the second positioning ring in an axial direction and are connected with the pressing mechanism, so that the pressing mechanism is coaxial with the guide base.

[0009] Further, the pressing mechanism comprises a mounting sleeve, a middle shaft, a limiting piece and a plurality of pressing pieces, a plurality of guide sleeves are arranged on the mounting sleeve, the guide sleeves are arranged one by one corresponding to the guide columns to make the mounting sleeve coaxial with the guide base, the middle shaft is arranged on the mounting sleeve and coaxial with the mounting sleeve, a plurality of the pressing pieces are distributed along the circumference of the mounting sleeve and connected with the middle shaft, the middle shaft is used to move in the axial direction away from the second positioning ring and drive the pressing pieces to extend radially to press the second radial diffuser, the middle shaft is also used to move in the axial direction to the second positioning ring and drive the pressing pieces to retract radially to separate from the second radial diffuser, the limiting piece is connected with the middle shaft and used to lock the middle shaft in the axial direction to fix the pressing pieces radially.

[0010] Further, a central groove coaxial with the mounting sleeve and a plurality of sliding grooves arranged radially along the mounting sleeve are arranged on the mounting sleeve, the middle shaft is matched with the central groove, and the pressing pieces are arranged one by one in the sliding grooves.

[0011] Further, the middle shaft comprises a guide part, an adjusting part and a limiting part arranged in sequence in the axial direction, the guide part is matched with the central groove, the adjusting part is tapered and the radial size gradually decreases from one end of the guide part to the other end of the limiting part, the limiting part extends out of the mounting sleeve and is connected with the limiting piece, the pressing piece comprises a positioning claw, a reset piece and a baffle, the positioning claw is arranged in the sliding groove, the baffle is fixedly connected to the mounting sleeve and located at one end of the positioning claw extending out of the sliding groove, an accommodating groove is arranged on the positioning claw, the reset piece is arranged in the accommodating groove, the two ends of the reset piece are respectively in abutment with the baffle and the groove bottom of the accommodating groove, a adjusting inclined surface matched with the adjusting part is arranged on the first end of the positioning claw, and the second end of the positioning claw is used to abut against the second radial diffuser.

[0012] According to another aspect of the present application, a double-station processing method of a radial diffuser is also provided, which adopts the double-station processing clamp of the radial diffuser as described above, and comprises the following steps:

[0013] S100, installing the double-station processing clamp of the radial diffuser to an electrode processing machine tool;

[0014] S200, sequentially installing the first radial diffuser and the second radial diffuser to the double-station processing clamp of the radial diffuser;

[0015] S300, preparing the first electrode and the second electrode, and adjusting the positions of the first electrode and the second electrode at the same time, so that the first electrode is aligned with the closed channel to be processed on the first radial diffuser, and the second electrode is aligned with the closed channel to be processed on the second radial diffuser;

[0016] S400, control the first electrode to sequentially roughen and finish the closed passage to be machined on the first radial diffuser, and control the second electrode to sequentially roughen and finish the closed passage to be machined on the second radial diffuser, until the closed passage to be machined on the first radial diffuser and the closed passage to be machined on the second radial diffuser are machined to the design state;

[0017] S500, rotate the double-station machining clamp of the radial diffuser by a suitable angle, so that the first electrode is aligned with the next closed passage to be machined on the first radial diffuser, and the second electrode is aligned with the next closed passage to be machined on the second radial diffuser;

[0018] S600, repeat steps S400-S500 until all the closed passages on the first radial diffuser and all the closed passages on the second radial diffuser are machined.

[0019] Further, the step S400 comprises the following steps:

[0020] S401, control the first electrode and the second electrode to release the first current to respectively roughen the closed passage to be machined on the first radial diffuser and the closed passage to be machined on the second radial diffuser;

[0021] S402, control the first electrode and the second electrode to release the second current to respectively finish the closed passage to be machined on the first radial diffuser and the closed passage to be machined on the second radial diffuser, and the closed passage to be machined on the first radial diffuser and the closed passage to be machined on the second radial diffuser are finished to the design state, wherein the first current is greater than the second current.

[0022] Further, the step S600 further comprises inspecting the machined first radial diffuser and the second radial diffuser, if there is arc burn, it needs to be repaired, if it is qualified, the machining of the first radial diffuser and the second radial diffuser is completed.

[0023] The present application has the following beneficial effects:

[0024] In the double-station machining clamp of the radial diffuser and the machining method, the two electrodes are used to simultaneously machine the two radial diffusers by designing the double-station machining clamp, so as to improve the machining efficiency of the radial diffuser. The double-station machining clamp of the radial diffuser facilitates the installation of the first radial diffuser and the second radial diffuser, and ensures that the machined first radial diffuser and the second radial diffuser are stable in position, coaxial, and have the same axial and angular positional relationship, so as to realize the overlapping placement of the two parts, and facilitate the simultaneous machining of the electrodes.

[0025] Specifically, when the double-station machining clamp of the radial diffuser is installed, first, the support seat is fixed on the electrode machining machine tool, then the first radial diffuser is placed on the first positioning ring and coaxial with the first positioning ring, and then the first radial diffuser is positioned circumferentially relative to the first positioning ring by cooperating the first angular positioning pin with the first radial diffuser, then the second positioning ring is detachably installed on the first positioning ring by bolts, and the second positioning ring is coaxial with the first positioning ring and the second angular positioning pin is coaxial with the first angular positioning pin, at this time, the first radial diffuser is axially positioned by the compression of the second positioning ring, then the second radial diffuser is placed on the second positioning ring and coaxial with the second positioning ring, and then the second radial diffuser is positioned circumferentially relative to the second positioning ring by cooperating the second angular positioning pin with the second radial diffuser, and finally the second radial diffuser is axially compressed by the compression mechanism, thereby completing the positioning and installation of the first radial diffuser and the second radial diffuser.

[0026] Specifically, first, the double-station machining clamp of the radial diffuser is installed on the electrode machining machine tool, then the first radial diffuser and the second radial diffuser are installed on the double-station machining clamp of the radial diffuser in turn, then the first electrode and the second electrode are prepared, and the positions of the first electrode and the second electrode are adjusted at the same time, so that the first electrode is aligned with the closed passage to be machined on the first radial diffuser, and the second electrode is aligned with the closed passage to be machined on the second radial diffuser, then the first electrode and the second electrode are controlled to release the first current to coarsely machine the closed passage to be machined on the first radial diffuser and the closed passage to be machined on the second radial diffuser respectively; then the first electrode and the second electrode are controlled to release the second current to finely machine the closed passage to be machined on the first radial diffuser and the closed passage to be machined on the second radial diffuser respectively, and the closed passage to be machined on the first radial diffuser and the closed passage to be machined on the second radial diffuser are both machined to the designed state, wherein the first current is greater than the second current, then the double-station machining clamp of the radial diffuser is rotated by a suitable angle, so that the first electrode is aligned with the next closed passage to be machined on the first radial diffuser, and at the same time the second electrode is also aligned with the next closed passage to be machined on the second radial diffuser, and the electrode machining steps are repeated until all the closed passages on the first radial diffuser and all the closed passages on the second radial diffuser are machined.

[0027] In summary, the double-station machining fixture of the radial diffuser and the double electrode simultaneously machine the two radial diffusers to improve the machining efficiency of the part. When the electrode is machining, the current is increased to perform rough machining to increase the discharge area and discharge intensity and improve the material removal rate. The closed channel on the radial diffuser is machined to the design state during fine machining. The reasonable distribution of rough and fine machining can improve the machining efficiency while ensuring the accuracy of the part.

[0028] In addition to the purposes, features and advantages described above, the present application has other purposes, features and advantages. The present application will be further described below with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0029] The accompanying drawings, which form a part of this application, are included to provide a further understanding of the application, illustrate the preferred embodiments of the application and assist in

[0030] Fig. 1 is a structural schematic view of the double-station machining fixture of the radial diffuser of the preferred embodiment of the present application;

[0031] Fig. 2 is a structural sectional view of the double-station machining fixture of the radial diffuser of the preferred embodiment of the present application;

[0032] Fig. 3 is a structural schematic view of the center shaft of the preferred embodiment of the present application;

[0033] Fig. 4 is a structural schematic view of the positioning claw of the preferred embodiment of the present application.

[0034] LEGEND

[0035] 100, support seat; 101, bottom plate; 102, guide base; 103, guide column;

[0036] 200, first positioning ring; 201, positioning inclined surface; 202, first angular positioning pin;

[0037] 300, second positioning ring; 301, conical ring; 302, second angular positioning pin;

[0038] 400, mounting sleeve; 401, sliding groove; 402, center groove; 403, guide sleeve;

[0039] 500, center shaft; 501, guide portion; 502, adjusting portion; 503, limiting portion;

[0040] 600, positioning claw; 601, containing groove; 602, adjusting inclined surface; 603, reset member; 604, stop block;

[0041] 700, a limiting member. DETAILED DESCRIPTION

[0042] The embodiments of the present application will be described in detail below with reference to the accompanying drawings, but the present application can be implemented in various different ways as defined and covered by the following.

[0043] As Figs. 1-4 shown, the double-station machining clamp of a radial diffuser in the embodiment is used for clamping a first radial diffuser and a second radial diffuser in sequence along an axial direction, and the double-station machining clamp of the radial diffuser comprises a support base, a first positioning part, a second positioning part and a pressing mechanism, wherein the support base is used for being fixed on a machine tool; the first positioning part comprises a first positioning ring arranged on the support base and a first angular positioning pin arranged on the first positioning ring; the second positioning part comprises a second positioning ring coaxially arranged with the first positioning ring and a second angular positioning pin arranged on the second positioning ring, and the second positioning ring is circumferentially positioned relative to the first positioning ring; the pressing mechanism is arranged on the second positioning ring; the first positioning ring is used for supporting the first radial diffuser and making the first radial diffuser coaxial with the first positioning ring, a first end of the second positioning ring and the first positioning ring are used for clamping the first radial diffuser to axially position the first radial diffuser, the first angular positioning pin is used for circumferentially positioning the first radial diffuser, a second end of the second positioning ring is used for supporting the second radial diffuser and making the second radial diffuser coaxial with the second positioning ring, the second end of the second positioning ring and the pressing mechanism are used for clamping the second radial diffuser and axially positioning the second positioning ring, and the second angular positioning pin is used for circumferentially positioning the second radial diffuser.

[0044] In the embodiment, a plurality of mounting holes are arranged on the support base, and the support base is mounted on the machine tool by means of bolts penetrating through the mounting holes. The first angular positioning pin and the second angular positioning pin are both rhombic pins, so as to facilitate fixing the angular positions of the first radial diffuser and the second radial diffuser and circumferentially positioning the first radial diffuser and the second radial diffuser relative to the support base.

[0045] Specifically, when the double-station machining clamp of the radial diffuser is installed, first, the support seat is fixed on the electrode machining machine tool, then the first radial diffuser is placed on the first positioning ring and coaxial with the first positioning ring, and then the first radial diffuser is positioned circumferentially relative to the first positioning ring by cooperating the first angular positioning pin with the first radial diffuser, then the second positioning ring is detachably installed on the first positioning ring by bolts, and the second positioning ring is coaxial with the first positioning ring and the second angular positioning pin is coaxial with the first angular positioning pin, at this time, the first radial diffuser is axially positioned by the compression of the second positioning ring, then the second radial diffuser is placed on the second positioning ring and coaxial with the second positioning ring, and then the second radial diffuser is positioned circumferentially relative to the second positioning ring by cooperating the second angular positioning pin with the second radial diffuser, and finally the second radial diffuser is axially compressed by the compression mechanism, thereby completing the positioning and installation of the first radial diffuser and the second radial diffuser.

[0046] Specifically, first, the double-station machining clamp of the radial diffuser is installed on the electrode machining machine tool, then the first radial diffuser and the second radial diffuser are installed on the double-station machining clamp of the radial diffuser in turn, then the first electrode and the second electrode are prepared, and the positions of the first electrode and the second electrode are adjusted at the same time, so that the first electrode is aligned with the closed passage to be machined on the first radial diffuser, and the second electrode is aligned with the closed passage to be machined on the second radial diffuser, then the first electrode and the second electrode are controlled to release the first current to coarsely machine the closed passage to be machined on the first radial diffuser and the closed passage to be machined on the second radial diffuser respectively; then the first electrode and the second electrode are controlled to release the second current to finely machine the closed passage to be machined on the first radial diffuser and the closed passage to be machined on the second radial diffuser respectively, and the closed passage to be machined on the first radial diffuser and the closed passage to be machined on the second radial diffuser are both machined to the designed state, wherein the first current is greater than the second current, then the double-station machining clamp of the radial diffuser is rotated by a suitable angle, so that the first electrode is aligned with the next closed passage to be machined on the first radial diffuser, and at the same time the second electrode is also aligned with the next closed passage to be machined on the second radial diffuser, and the electrode machining steps are repeated until all the closed passages on the first radial diffuser and all the closed passages on the second radial diffuser are machined.

[0047] In summary, the two radial diffusers are simultaneously machined by using two electrodes through the design of the double-station machining fixture, so as to improve the machining efficiency of the radial diffuser. The double-station machining fixture of the radial diffuser facilitates the installation of the first radial diffuser and the second radial diffuser, and ensures that the positions of the machined first radial diffuser and the second radial diffuser are stable, coaxial, and have the same axial and angular positional relationships, so as to realize the overlapping placement of the two parts and facilitate the simultaneous machining of the electrodes. The two radial diffusers are simultaneously machined by using the double-station machining fixture of the radial diffuser and the double electrodes, so as to improve the machining efficiency of the parts. When the electrodes are machined, the current is increased for rough machining, so as to increase the discharge area and the discharge intensity, and improve the material removal rate. The closed channel on the radial diffuser is machined to the design state during fine machining, and the reasonable distribution of rough machining and fine machining can improve the machining efficiency under the premise of ensuring the accuracy of the parts.

[0048] Further, an inner circle of the first positioning ring is provided with a positioning inclined surface, and a first end of the second positioning ring is provided with a tapered ring matched with the positioning inclined surface. In the embodiment, the second positioning ring is centered by the tapered surface stop through the first positioning ring, which can play the role of axial centering, so as to ensure that the first radial diffuser installed on the first positioning ring is parallel to the second radial diffuser installed on the second positioning ring.

[0049] Further, the support seat comprises a bottom plate connected with the machine tool and a guide base provided on the bottom plate, and the first positioning ring is sleeved on the guide base and coaxial with the guide base.

[0050] In the embodiment, the outer circle of the guide base is coaxial with the inner circle of the first positioning ring, so as to ensure that the first positioning ring can be stably installed on the bottom plate and radially positioned with the guide base.

[0051] Further, an end of the guide base towards the first positioning ring is provided with a plurality of guide columns, the guide columns are distributed along the circumference of the guide base, and the guide columns sequentially pass through the first positioning ring and the second positioning ring along the axial direction and are connected with the pressing mechanism, so as to make the pressing mechanism coaxial with the guide base.

[0052] In the embodiment, the number of guide columns is three, the guide columns are positioned in cooperation with the pressing mechanism, so as to ensure that the pressing mechanism is coaxial with the guide base, and further ensure that the pressing mechanism is coaxial with the first positioning ring and the second positioning ring, thereby ensuring that the pressing mechanism can stably clamp the second radial diffuser.

[0053] Further, the pressing mechanism comprises a mounting sleeve, a middle shaft, a limiting piece and a plurality of pressing pieces, the mounting sleeve is provided with a plurality of guide sleeves, the guide sleeves are arranged one by one corresponding to the guide columns to make the mounting sleeve coaxial with the guide base, the middle shaft is arranged on the mounting sleeve and coaxial with the mounting sleeve, the plurality of pressing pieces are distributed along the circumference of the mounting sleeve and connected with the middle shaft, the middle shaft is used to move along the axial direction away from the second positioning ring and drive the pressing pieces to extend radially to press the second radial diffuser, the middle shaft is also used to move along the axial direction to the second positioning ring and drive the pressing pieces to retract radially to separate from the second radial diffuser, the limiting piece is connected with the middle shaft and used to lock the middle shaft along the axial direction to make the pressing pieces fixed radially.

[0054] In the embodiment, the mounting sleeve is provided with three guide sleeves, the guide sleeves are ball guide sleeves for corresponding matching with the guide columns, so that the mounting sleeve is coaxial with the guide base, the number of the pressing pieces is also three, which are distributed along the circumference of the mounting sleeve, the limiting piece is a nut which is threadedly connected with the middle shaft, by loosening the limiting piece, the middle shaft can move upward along the axial direction, and the pressing pieces are driven by the middle shaft to open radially outward to press the second radial diffuser, by loosening the limiting piece, the middle shaft can move along the axial direction to the second positioning ring, so that the pressing pieces can retract to separate from the second radial diffuser, thereby facilitating the disassembly of the second radial diffuser after processing.

[0055] Further, the mounting sleeve is provided with a central groove coaxial with the mounting sleeve and a plurality of sliding grooves arranged radially along the mounting sleeve, the middle shaft is matched with the central groove, and the pressing pieces are arranged one by one in the sliding grooves.

[0056] In the embodiment, the mounting sleeve comprises a mounting sleeve bottom plate and a mounting sleeve cover plate which cooperate with each other, the sliding grooves are arranged on the mounting bottom plate of the mounting sleeve and radially, and the pressing pieces are slidingly connected in the sliding grooves, the sliding grooves provide guidance for the movement of the pressing pieces to ensure that the pressing pieces can move radially along the mounting sleeve.

[0057] Further, the middle shaft comprises a guiding portion, an adjusting portion and a limiting portion arranged in sequence along the axial direction, the guiding portion is matched with the central groove, the adjusting portion is tapered and the radial dimension thereof is gradually reduced from one end of the guiding portion to the other end of the limiting portion, the limiting portion extends out of the mounting sleeve and is connected with the limiting member, the pressing member comprises a positioning claw, a reset member and a baffle, the positioning claw is arranged in the sliding groove, the baffle is fixedly connected to the mounting sleeve and located at one end of the positioning claw extending out of the sliding groove, the positioning claw is provided with an accommodating groove, the reset member is arranged in the accommodating groove, the two ends of the reset member are respectively in abutment with the baffle and the groove bottom of the accommodating groove, the first end of the positioning claw is provided with an adjusting inclined surface matched with the adjusting portion, and the second end of the positioning claw is used to abut against the second radial diffuser.

[0058] In the embodiment, the middle shaft comprises a guiding portion, an adjusting portion and a limiting portion arranged in sequence along the axial direction, the guiding portion is matched with the central groove, the adjusting portion is tapered and the radial dimension thereof is gradually reduced from one end of the guiding portion to the other end of the limiting portion, the limiting portion extends out of the mounting sleeve and is connected with the limiting member, the pressing member comprises a positioning claw, a reset member and a baffle, wherein the positioning claw is arranged in the sliding groove, the clamping surface of the end of the positioning claw in contact with the second radial diffuser is provided with a buffer member, so as to protect the radial diffuser from being damaged when being pressed, the positioning claw is provided with an accommodating groove, the reset member is arranged in the accommodating groove, the two ends of the reset member are respectively in abutment with the baffle and the groove bottom of the accommodating groove, so that the positioning claw can be restored under the action of the spring after being separated from the extrusion of the middle shaft.

[0059] According to another aspect of the present application, a double-station processing method of a radial diffuser is also provided, which adopts the double-station processing clamp of the radial diffuser as described above, and comprises the following steps:

[0060] S100, installing the double-station processing clamp of the radial diffuser to an electrode processing machine tool;

[0061] S200, sequentially installing the first radial diffuser and the second radial diffuser to the double-station processing clamp of the radial diffuser;

[0062] S300, preparing the first electrode and the second electrode, and simultaneously adjusting the positions of the first electrode and the second electrode, so that the first electrode is aligned with the closed channel to be processed on the first radial diffuser, and the second electrode is aligned with the closed channel to be processed on the second radial diffuser;

[0063] S400, controlling the first electrode to sequentially perform rough machining and finish machining on the closed channel to be processed on the first radial diffuser, and simultaneously controlling the second electrode to sequentially perform rough machining and finish machining on the closed channel to be processed on the second radial diffuser, until the closed channel to be processed on the first radial diffuser and the closed channel to be processed on the second radial diffuser are both machined to the designed state;

[0064] S500, rotating the double-station machining clamp of the radial diffuser by a proper angle to align the first electrode with the next closed passage to be machined on the first radial diffuser and align the second electrode with the next closed passage to be machined on the second radial diffuser;

[0065] S600, repeating steps S400-S500 until all the closed passages on the first radial diffuser and all the closed passages on the second radial diffuser are machined.

[0066] In the embodiment, the machining allowance is reasonably allocated through the machining allowance optimization, and the spark position compensation is adjusted through parameter adjustment, so that the finishing machining amount is reduced without affecting the roughness, and the machining efficiency is improved.

[0067] For step S100, the supporting surfaces of the clamp need to be aligned after the double-station machining clamp of the radial diffuser is installed, that is, the supporting surfaces of the first positioning ring and the second positioning ring are aligned, and four symmetrical detection points are randomly selected on the first positioning ring to ensure that the circle runout meets the requirements. After the double-station machining clamp of the radial diffuser is adjusted, it is ensured that the first radial diffuser and the second radial diffuser machined subsequently can have a good axial relationship after installation, so as to facilitate the electrochemical machining of the closed passage.

[0068] For step S500, in actual machining engineering, after one closed passage is machined by using the first electrode and the second electrode respectively, the double-station machining clamp of the radial diffuser is rotated by 180°, and then the symmetrical machining of the closed passage is performed. After machining again, the double-station machining clamp of the radial diffuser is rotated by 90°, and then the closed passage is machined. After machining again, the double-station machining clamp of the radial diffuser is rotated by 180°, and then the symmetrical machining of the closed passage is performed. Each electrode needs to machine 4 closed passages, and the electrode loss is compensated after machining one passage each time.

[0069] Further, the step S400 comprises the following steps:

[0070] S401, controlling the first electrode and the second electrode to release a first current to coarsely machine the closed passage to be machined on the first radial diffuser and the closed passage to be machined on the second radial diffuser respectively;

[0071] S402, controlling the first electrode and the second electrode to release a second current to finely machine the closed passage to be machined on the first radial diffuser and the closed passage to be machined on the second radial diffuser respectively, and the closed passage to be machined on the first radial diffuser and the closed passage to be machined on the second radial diffuser are machined to the design state, wherein the first current is greater than the second current.

[0072] In the embodiment, the electrical processing device calculates the spark position compensation according to the given parameters to determine the electrode processing translation amount.

[0073] Before processing, the discharge condition setting is needed, i.e. setting the final surface roughness (VDI) of the part, the total processing depth (margin) and the discharge area, and the system generates the electrical discharge parameters according to the set boundary conditions. The process is VDI processing.

[0074] The processing time T can be simply calculated by the material removal amount AP and the material removal rate E of the discharge condition, through the input of the discharge condition (VDI) A (i.e. the final surface roughness requirement (VDI) of the processing margin A, the processing depth (margin) and the discharge area, etc. boundary conditions):

[0075] According to the formula, the sum of the margin A is a fixed value, the larger the A (the larger the VDI), the larger the material removal rate E, so as to remove most of the margin in rough machining, i.e. the larger the A, the larger the AP, and the smaller the T.

[0076] According to the formula of the processing time, we can consider that the actual given spark position compensation of the system adds many safety factors to ensure that the processing size gradually approaches the final size, but the spark position compensation is too large, which leads to the decrease of the translation amount of the part, i.e. the decrease of the removal amount, resulting in the slow speed of the finishing machining. Therefore, the finishing efficiency can be improved by reasonably adjusting the spark position compensation.

[0077] Therefore, in the processing method, the rough machining is performed by increasing the current to realize the increase of the discharge area and the discharge intensity, and the material removal rate is improved, and then the closed channel processing on the radial diffuser is processed to the design state, and the reasonable distribution of rough and fine machining is adopted, so that the processing efficiency can be improved on the premise of ensuring the accuracy of the part.

[0078] Further, the step S600 further includes checking the first radial diffuser and the second radial diffuser after processing, and if there is arc burn, it needs to be repaired, and if it is qualified, the processing of the first radial diffuser and the second radial diffuser is completed.

[0079] In the embodiment, the electrode is checked after processing, which can ensure the processing quality of the part, reduce the outflow of defective products, and improve the qualified rate of the part.

[0080] The above only describes the preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A dual-station machining fixture for radial diffusers, used to sequentially clamp a first radial diffuser and a second radial diffuser along the axial direction, characterized in that, The dual-station machining fixture for the radial diffuser includes: A support base (100) is used to fix the machine tool; The first positioning part includes a first positioning ring (200) disposed on the support base (100) and a first angular positioning pin (202) disposed on the first positioning ring (200); The second positioning part includes a second positioning ring (300) coaxially disposed with the first positioning ring (200) and a second angular positioning pin (302) disposed on the second positioning ring (300). The second positioning ring (300) is circumferentially positioned relative to the first positioning ring (200). A clamping mechanism is disposed on the second positioning ring (300); The first positioning ring (200) is used to support the first radial diffuser and make the first radial diffuser coaxial with the first positioning ring (200). The first end of the second positioning ring (300) and the first positioning ring (200) are used to clamp the first radial diffuser to make the first radial diffuser axially positioned. The first angular positioning pin (202) is used to make the first radial diffuser circumferentially positioned relative to the first positioning ring (200). The second end of the second positioning ring (300) is used to support the second radial diffuser and make the second radial diffuser coaxial with the second positioning ring (300). The second end of the second positioning ring (300) and the clamping mechanism are used to clamp the second radial diffuser to make the second positioning ring (300) axially positioned. The second angular positioning pin (302) is used to make the second radial diffuser circumferentially positioned relative to the second positioning ring (300). The support base (100) includes a base plate (101) for connecting with the machine tool and a guide base (102) disposed on the base plate (101). The first positioning ring (200) is sleeved on the guide base (102) and coaxial with the guide base (102). The guide base (102) is provided with a plurality of guide posts (103) at one end facing the first positioning ring (200). The plurality of guide posts (103) are distributed at intervals along the circumference of the guide base (102). The guide posts (103) pass through the first positioning ring (200) and the second positioning ring (300) in sequence along the axial direction and are connected to the pressing mechanism so that the pressing mechanism is coaxial with the guide base (102). The clamping mechanism includes a mounting sleeve (400), a central shaft (500), a limiting member (700), and several clamping members. The mounting sleeve (400) is provided with several guide sleeves (403), each guide sleeve (403) corresponding to a guide post (103) to ensure that the mounting sleeve (400) is coaxial with the guide base (102). The central shaft (500) is mounted on the mounting sleeve (400) and coaxial with it. The clamping members are distributed at intervals along the circumference of the mounting sleeve (400). It is connected to the central shaft (500), which is used to move axially away from the second positioning ring (300) and drive the clamping member to extend radially to clamp the second radial diffuser. The central shaft (500) is also used to move axially towards the second positioning ring (300) and drive the clamping member to retract radially to disengage from the second radial diffuser. The limiting member (700) is connected to the central shaft (500) and is used to lock the central shaft (500) axially so that the clamping member is fixed radially.

2. The dual-station machining fixture for radial diffusers according to claim 1, characterized in that, The first positioning ring (200) has a positioning inclined surface (201) on its inner circle, and the second positioning ring (300) has a tapered ring (301) at its first end that matches the positioning inclined surface (201).

3. The dual-station machining fixture for radial diffusers according to claim 1, characterized in that, The mounting sleeve (400) has a central groove (402) coaxially arranged with the mounting sleeve (400) and a plurality of sliding grooves (401) arranged radially along the mounting sleeve (400). The central shaft (500) cooperates with the central groove (402), and the clamping members are arranged one by one in the sliding grooves (401).

4. The dual-station machining fixture for radial diffusers according to claim 3, characterized in that, The central shaft (500) includes a guide portion (501), an adjusting portion (502), and a limiting portion (503) arranged sequentially along the axial direction. The guide portion (501) cooperates with the central groove (402). The adjusting portion (502) is tapered, and its radial dimension gradually decreases from one end of the guide portion (501) toward the limiting portion (503). The limiting portion (503) extends out of the mounting sleeve (400) and connects with the limiting member (700). The clamping member includes a positioning claw (600), a resetting member (603), and a baffle (604). The positioning claw (600) is disposed in the sliding groove (401), and the baffle (604) is disposed in the sliding groove (401). The plate (604) is fixedly connected to the mounting sleeve (400) and located on the sliding groove (401) at one end of the positioning claw (600). The positioning claw (600) has a receiving groove (601). The reset member (603) is disposed in the receiving groove (601). The two ends of the reset member (603) abut against the bottom of the baffle (604) and the receiving groove (601) respectively. The first end of the positioning claw (600) has an adjusting inclined surface (602) that cooperates with the adjusting part (502). The second end of the positioning claw (600) is used to abut against the second radial diffuser.

5. A dual-station machining method for a radial diffuser, employing a dual-station machining fixture for radial diffusers as described in any one of claims 1 to 4, characterized in that, Includes the following steps: S100, the dual-station machining fixture for the radial diffuser is mounted onto the electrode machining machine tool; S200, the first radial diffuser and the second radial diffuser are sequentially installed onto the dual-station machining fixture of the radial diffuser; S300, prepare the first electrode and the second electrode, and simultaneously adjust the positions of the first electrode and the second electrode so that the first electrode is aligned with the closed channel to be processed on the first radial diffuser, and the second electrode is aligned with the closed channel to be processed on the second radial diffuser. S400, control the first electrode to perform roughing and finishing on the closed channel to be processed on the first radial diffuser in sequence, and at the same time control the second electrode to perform roughing and finishing on the closed channel to be processed on the second radial diffuser in sequence, until the closed channel to be processed on the first radial diffuser and the closed channel to be processed on the second radial diffuser are both processed to the design state. S500, rotate the dual-station machining fixture of the radial diffuser at a suitable angle so that the first electrode is aligned with the next closed channel to be machined on the first radial diffuser, and the second electrode is aligned with the next closed channel to be machined on the second radial diffuser. S600, repeat steps S400~S500 until all closed channels on the first radial diffuser and all closed channels on the second radial diffuser are machined.

6. The dual-station machining method for radial diffusers according to claim 5, characterized in that, Step S400 includes the following steps: S401, control the first electrode and the second electrode to release the first current to perform rough machining on the closed channel to be machined on the first radial diffuser and the closed channel to be machined on the second radial diffuser respectively. S402, control the first electrode and the second electrode to release the second current to perform fine machining on the closed channel to be processed on the first radial diffuser and the closed channel to be processed on the second radial diffuser respectively, and process the closed channel to be processed on the first radial diffuser and the closed channel to be processed on the second radial diffuser to the design state. The first current is greater than the second current.

7. The dual-station machining method for radial diffusers according to claim 5, characterized in that, After step S600, the process also includes inspecting the processed first and second radial diffusers. If arc burns are found, the diffusers need to be repaired. If they pass the inspection, the processing of the first and second radial diffusers is completed.

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