Diameter expansion machine housing flow channel processing technology and abrasive flow clamp

Abstract

The application discloses a radial expansion machine case flow channel machining process and abrasive grain flow clamps, wherein the radial expansion machine case flow channel machining process comprises the following steps: S100, a slot is formed on the radial expansion machine case by machining to form a blank passage; S200, a first rough machining electrode is used to remove the remaining part of the blank passage to form a primary machining flow channel; S300, a second rough machining electrode is designed according to the design profile of the flow channel, and the designed second rough machining electrode is inserted into the primary machining flow channel and moves along the flow channel in two dimensions by a mechanical hand to form a rough machining flow channel; S400, a semi-finishing machining flow channel is electrolytically machined by using an electrode to form a flow channel meeting the design size requirement; and S500, the radial expansion machine case is clamped by using the abrasive grain flow clamp, and abrasive grain flow is used to process the roughness of the flow channel to Ra0.8. The above process solves the technical problems of how to improve the machining difficulty of the radial expansion machine case flow channel, the low machining efficiency and the poor surface quality after machining.

Description

Technical Field

[0001] This invention relates to the technical field of radial expansion casing machining, and more particularly, to a machining process for the flow channel of a radial expansion casing. Furthermore, this invention also relates to an abrasive flow machining fixture used in the radial expansion casing flow channel machining process. Background Technology

[0002] The radial expansion casing of an aero engine is made of titanium alloy forgings, such as... Figure 1 The radial expansion casing has 23 closed flow channels circumferentially. These channels are arc-shaped with a minimum wall thickness of only 1.7mm, making machining difficult. The channel depth is 218mm, resulting in poor accessibility during machining, as machining tools struggle to penetrate the entire channel. Furthermore, high precision is required for the channel profile and surface roughness; the profile requirement is 0.06mm, and the surface roughness of the blade and upper and lower flow channels is Ra0.8mm. Due to these reasons, precision electrical discharge machining (EDM) is typically used to machine the flow channels of the radial expansion casing. However, because the part is made of titanium alloy TA19, which has a low thermal conductivity compared to other metals, the metal may not fully melt before being ejected from the flow channel or solidify within it, leading to unstable machining conditions. This is especially problematic when machining cavities with large widths and depths, where the generated material is difficult to remove effectively, easily resulting in arcing defects. This leads to low machining efficiency, high electrode wear, poor surface quality, and poor manufacturability.

[0003] like Figure 1 As described above, a first tangent line is drawn along the farthest point of the lower flow channel. At the same time, a first parallel line parallel to the first tangent line and a second parallel line parallel to the upper flow channel outlet point are drawn. The distance between the first tangent line and the first parallel line is A, and the distance between the first tangent line and the second parallel line is B. Since B is greater than A, and the second parallel line does not pass through the flow channel, it is difficult to directly process the flow channel through a one-dimensional moving electrode, resulting in a difficult and complex flow channel processing problem. Summary of the Invention

[0004] This invention provides a machining process and abrasive flow machining fixture for the radial expansion casing flow channel, in order to solve the technical problems of difficult machining, low machining efficiency, and poor surface quality after machining.

[0005] According to one aspect of the present invention, a process for machining flow channels in a radial expansion casing is provided, for machining flow channels on a radial expansion casing, comprising the following steps:

[0006] S100 uses machining to create slots in the radial expansion casing to form blank channels;

[0007] S200, design the first rough machining electrode, and extend the first rough machining electrode from the outlet of the blank channel in the vertical direction to perform the initial machining of the blank channel, complete the partial removal of the excess amount of the blank channel, and form the initial machining flow channel;

[0008] S300, design the second rough machining electrode, offset the upper profile of the flow channel in the design size state by 0.4-0.5 mm in the horizontal direction towards the lower profile of the flow channel to form the upper profile of the second rough machining electrode, offset the lower profile of the flow channel in the design size state by 0.4-0.5 mm in the horizontal direction towards the upper profile of the flow channel to form the lower profile of the second rough machining electrode, extend the designed second rough machining electrode into the initial machining flow channel and control the two-dimensional movement along the flow channel by the mechanical hand, and process the rough machining flow channel with a machining allowance of 0.3-0.5 mm;

[0009] S400, electrolytically machine the rough machining flow channel machined in step S300 by using the electrode to form the flow channel reaching the design size requirement;

[0010] S500, clamp the radial expansion machine case by using the abrasive grain flow clamp, and guide the abrasive grain flow to process the roughness of the flow channel to Ra0.8.

[0011] Further, the step S100 comprises the following steps:

[0012] S101, drill the pre-machining position of the flow channel in the design size state of the radial expansion machine case by using a drilling machine, and process the blank channel with a diameter of 6.4-6.6 mm;

[0013] S102, turn the outlet of the blank channel by using a lathe, and process the horn mouth with an opening angle of 25°.

[0014] Further, the step S200 comprises the following steps:

[0015] S201, design the first rough machining electrode, make a first tangent line tangent to the outlet point of the upper profile of the flow channel in the design size state, offset the upper profile of the flow channel by 0.5 mm in the horizontal direction towards the lower flow channel with the first tangent line as the starting end to form the upper profile of the first rough machining electrode, make a vertical line on the lower profile of the flow channel in the design size state, find the inflection point where the vertical line intersects with one point and two points of the upper profile of the flow channel, and make the vertical line passing through the inflection point as a second tangent line, offset the part of the lower profile of the flow channel intersecting with the second tangent line by 0.4-0.5 mm in the horizontal direction towards the upper flow channel with the second tangent line as the starting end to form the lower profile of the first rough machining electrode;

[0016] S202, the designed first rough machining electrode is extended into the blank channel and moved along the vertical direction by the mechanical hand to perform the primary machining of the blank channel, complete the removal of the remaining amount of the flow channel part, and form a primary machining flow channel;

[0017] Further, the step S300 further includes: moving the second rough machining electrode along the horizontal direction in the rough machining flow channel by the mechanical hand, reserving a machining allowance of 0.1-0.15 mm to complete the semi-finishing of the flow channel to form a semi-finishing flow channel.

[0018] Further, the step S400 includes the following steps:

[0019] S401, designing the first finishing electrode, offsetting the upper profile of the flow channel in the design size state along the horizontal direction towards the lower profile of the flow channel by 0.1 mm to form the upper profile of the first finishing electrode, and offsetting the lower profile of the flow channel in the design size state along the horizontal direction towards the upper profile of the flow channel by 0.1 mm to form the lower profile of the first finishing electrode;

[0020] S402, the designed first finishing electrode performs the primary finishing of the semi-finishing flow channel to process the surface roughness of the flow channel to Ra1.6 to form a finishing flow channel;

[0021] S403, designing the second finishing electrode, the second finishing electrode is provided with a chamfer groove, and the profile of the chamfer groove matches the round corner at the inlet of the flow channel in the design state;

[0022] S404, the upper profile and the lower profile of the inlet end of the finishing flow channel are chamfered by the second finishing electrode to form a flow channel meeting the design size requirements.

[0023] Further, the step S500 includes the following steps:

[0024] S501, installing the flow channel finishing radial expansion machine case on the abrasive flow clamp and fixing the radial expansion machine case axially, circumferentially and radially relative to the abrasive flow clamp;

[0025] S502, injecting the abrasive into the flow channel, and setting the pressure of the abrasive, the volume of the abrasive per stroke, and the cycle number to ensure that the roughness of the flow channel after abrasive grinding is processed to Ra0.8.

[0026] Further, the pressure of the abrasive for flow channel grinding is 200-210 PSI.

[0027] According to another aspect of the present application, there is also provided an abrasive flow clamp for clamping the above-mentioned diameter expansion chamber and guiding the abrasive flow to process the flow channel of the diameter expansion chamber, which comprises a base, and a limiting assembly, the base is provided with a connecting cylinder coaxial with the base, the top of the connecting cylinder is provided with an upper cover plate, the upper cover plate is provided with a plurality of abrasive channels, the abrasive channels are used for injecting abrasive and making the abrasive flow into the flow channel of the diameter expansion chamber; the limiting assembly comprises a lower limiting part arranged on the base for radially limiting the lower part of the diameter expansion chamber and an upper limiting part arranged on the upper cover plate for radially limiting the upper part of the diameter expansion chamber, the diameter expansion chamber is clamped between the upper limiting part and the lower limiting part to position the diameter expansion chamber radially relative to the base, and the lower limiting part is provided with an angular hole for circumferentially limiting the diameter expansion chamber.

[0028] Further, the lower limiting part comprises a lower protection block fixed on the base and a supporting block, the lower protection block is used for abutting against the inner circle stop of the lower part of the diameter expansion chamber, and the supporting block is used for abutting against the outer circle of the lower part of the diameter expansion chamber.

[0029] Further, the upper limiting part comprises an upper protection block fixed on the upper cover plate, a mounting ring arranged on the upper protection block, and an impeller arranged on the mounting ring, the mounting ring is used for abutting against the outer circle of the upper part of the diameter expansion chamber, and the impeller is used for abutting against the inner circle of the upper part of the diameter expansion chamber.

[0030] The present application has the following advantages:

[0031] In the diameter expansion chamber flow channel processing process of the present application, the blank channel is first machined to remove most of the excess before electrode processing, then the blank channel is sequentially rough machined, semi-finished machined and finished machined by the electrode spark, so as to process the flow channel to the designed size and process the surface roughness in the flow channel to Ra1.6, finally the surface of the flow channel is finally processed by the abrasive flow to process the flow channel surface to the surface roughness of Ra0.8.

[0032] In specific implementation, the blank channel of the flow channel is first opened by machining means at the opening of the flow channel of the radial expansion machine box, so that the metal residues can be immediately discharged during subsequent electrode correction machining, and the machining time of the electrode is shortened and the machining efficiency is improved. Then, the first rough machining electrode is designed to rough machine the flow channel to remove most of the excess at the outlet. Then, the second rough machining electrode is designed, and the second rough machining electrode is moved in two dimensions along the shape of the designed flow channel to machine the blank channel into the primary machining flow channel with the flow channel profile, and the rough machining flow channel is reserved with a machining allowance of 0.3-0.5 mm. Then, the second rough machining electrode is used for semi-finishing machining to further reduce the machining allowance of the flow channel, so that the machining allowance is reserved to 0.1-0.15 mm. Then, the electrode is moved in two dimensions along the shape of the designed flow channel to finish machine the flow channel, so that the flow channel meets the design size requirement, and the surface roughness of the flow channel is machined to Ra1.6. Finally, the flow channel surface is polished by abrasive flow to further improve the roughness of the flow channel surface to Ra0.8.

[0033] In summary, the blank channel opened by machining solves the problem that the metal residues are difficult to discharge by directly using the electrode, and the machining time of the electrode is shortened and the machining efficiency is improved. Then, the electrode machining is divided into three processes of rough machining-semi-finishing-precision machining to reduce the machining difficulty of one-time machining, improve the accuracy during machining, and enable the electrode to move in two dimensions along the shape of the designed flow channel, solve the problem that the flow channel channel is difficult to be machined directly by the one-dimensional motion electrode in the prior art, and finally the flow channel surface is polished by abrasive flow to solve the problem of poor surface quality after electrode machining.

[0034] 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

[0035] 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 explaining the application. In the drawings:

[0036] Figure 1 is a structure schematic diagram of the radial expansion machine box of the preferred embodiment of the present application;

[0037] Figure 2 is a machining schematic diagram of the blank channel of the preferred embodiment of the present application;

[0038] Figure 3 is a machining schematic diagram of the first rough machining electrode of the preferred embodiment of the present application;

[0039] Figure 4This is a schematic diagram of the machining of the second roughing electrode according to a preferred embodiment of the present invention;

[0040] Figure 5 This is a schematic diagram of the processing of the second finishing electrode according to a preferred embodiment of the present invention;

[0041] Figure 6 This is a schematic diagram of the structure of the second finishing electrode according to a preferred embodiment of the present invention;

[0042] Figure 7 This is a schematic diagram of the abrasive flow fixture according to a preferred embodiment of the present invention.

[0043] Legend:

[0044] 100. Radial expansion casing; 101. Flow channel; 102. Upper profile; 103. Lower profile; 104. Blank channel; 105. Bell mouth;

[0045] 200, First roughing electrode; 201, Second roughing electrode;

[0046] 300. Second finishing electrode; 301. Chamfered groove;

[0047] 400. Base; 401. Connecting cylinder; 402. Top cover plate; 403. Abrasive channel;

[0048] 500. Lower limit part; 501. Lower protective block; 502. Support block;

[0049] 600, Upper limit position; 601, Upper protective block; 602, Mounting ring; 603, Impeller. Detailed Implementation

[0050] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0051] like Figures 1-6 As shown, the machining process for the flow channel of the radial expansion casing in this embodiment is used to machine the flow channel 101 on the radial expansion casing 100, and includes the following steps:

[0052] S100, a blank channel 104 is formed by machining a groove on the radial expansion casing 100;

[0053] S200, design the first roughing electrode 200, and extend the first roughing electrode 200 vertically from the outlet of the blank channel 104 to perform the initial processing of the blank channel 104, complete the removal of part of the excess in the blank channel 104, so as to form the initial processing flow channel.

[0054] S300, the second rough machining electrode 201 is designed, the upper profile 102 of the runner 101 in the design size state is offset by 0.4-0.5 mm in the horizontal direction to the lower profile 103 of the runner 101 to form the upper profile of the second rough machining electrode, the lower profile 103 of the runner 101 in the design size state is offset by 0.5 mm in the horizontal direction to the upper profile 102 of the runner 101 to form the lower profile of the second rough machining electrode 201, and the designed second rough machining electrode is extended into the primary machining runner and is controlled to move in two dimensions along the runner 101 by the mechanical hand, and a machining allowance of 0.3-0.5 mm is reserved to form the rough machining runner;

[0055] S400, the rough machining runner 1 processed by the electrode in step S300 is electrolytically machined to form the runner 101 reaching the design size requirement;

[0056] S500, the radial expansion machine case 100 is clamped by the abrasive grain flow clamp, and the roughness of the runner 101 is processed to Ra0.8 by the abrasive grain flow.

[0057] In the embodiment, for step S100, the drilling machine is used to machine the blank passage 104 at the runner 101 of the radial expansion machine case 100, the blank passage 104 is used to remove the machining allowance of the runner 101 as much as possible before the electrical machining, and the machining allowance is reserved relatively uniformly on both sides of the runner 101, and the machining is carried out through the entire runner 101, so that the subsequent electrical machining of the runner 101 is facilitated.

[0058] For step S200, when the electrode is used for electrical spark machining, the material of the electrode is graphite, and the motor is selected according to the machining state to ensure that the rough machining runner 101 can reserve a machining allowance of 0.3-0.5 mm after rough machining, which can ensure the machining accuracy of the subsequent semi-finishing and reduce the machining time of the subsequent semi-finishing and improve the machining efficiency.

[0059] For step S300, the profile of the second rough machining electrode 201 is consistent with the profile of the runner 101, and the size is obtained by narrowing the runner 101 inward by 0.4-0.5 mm, at this time, the second rough machining electrode 201 is two-dimensionally moved along the profile of the runner 101, and then the blank passage 104 is machined into the rough machining runner 101 with the profile of the runner 101, and the rough machining runner 101 reserves a machining allowance of 0.3-0.5 mm. In this way, the subsequent semi-finishing has sufficient cutting error, and the operability of the semi-finishing is improved.

[0060] For step S500, the abrasive grain flow clamp can clamp the radial expansion machine case 100, and can guide the abrasive grain flow to process the roughness of the runner 101 to Ra0.8.

[0061] Specifically, first, the blank channel 104 is opened by machining to remove most of the excess before electrode processing, and then the blank channel 104 is sequentially rough machined, semi-finished machined and finished machined by the electrode spark to process the runner 101 to the designed size, and the surface roughness in the runner 101 is machined to Ra1.6, and finally the surface of the runner 101 is finally machined by abrasive flow to process the surface of the runner 101 to a surface roughness of Ra0.8.

[0062] In specific implementation, first, the blank channel 104 of the runner 101 is opened in the runner 101 of the radial expansion machine case 100 by machining means, so that metal residues can be immediately discharged during subsequent electrode correction processing, and the electrode processing time can be shortened to improve processing efficiency. Then, the first rough machining electrode 200 is designed to rough machine the runner 101 to remove most of the excess at the outlet, and then the second rough machining electrode 201 is designed and moved along the designed shape of the runner 101 in two dimensions to process the blank channel 104 into the initial processing runner 101 with the profile of the runner 101, and to leave a machining allowance of 0.3-0.5mm for the rough machining runner 101. Then, semi-finished machining is performed by electrode to further reduce the machining allowance of the runner 101, so that the machining allowance is left to 0.1-0.15mm, and then the electrode is moved along the designed shape of the runner 101 in two dimensions to finish machine the runner 101, so that the runner 101 reaches the design size requirement and the surface roughness of the runner 101 is machined to Ra1.6. Finally, the surface of the runner 101 is polished by abrasive flow to further improve the roughness of the surface of the runner 101 to Ra0.8.

[0063] In summary, the blank channel 104 opened by machining solves the problem that metal residues are difficult to discharge by directly using the electrode to process, and can shorten the electrode processing time to improve processing efficiency. Then, the electrode processing is divided into three processes of rough machining-semi-finished machining-finished machining to reduce the difficulty of one-time machining, improve the accuracy during machining, and enable the electrode to move in two dimensions along the designed shape of the runner 101, solving the problem that the runner 101 channel is difficult to be directly machined by the one-dimensional electrode in the prior art. Finally, the surface of the runner 101 is polished by abrasive flow to solve the problem of poor surface quality after electrode processing.

[0064] Further, the step S100 includes the following steps:

[0065] S101, using a drill to drill the pre-processed runner 101 of the radial expansion machine case 100 in the designed size state to process a blank channel 104 with a diameter of 6.4-6.6mm;

[0066] S102, using a lathe to turn the outlet of the blank passage 104, and process a horn mouth 105 with an opening angle of 25°.

[0067] In the present embodiment, for step S101, a drill press is used to process the flow passage 101 of the radial expansion machine case 100, and a blank passage 104 is opened, which is prepared for subsequent electrode processing. The blank passage 104 is processed according to the structural characteristics of the flow passage 101, and the flow passage 101 is processed as much as possible before electro-processing, and the flow passage 101 is processed uniformly on both sides, and the entire flow passage 101 is processed, so that the subsequent electro-processing of the flow passage 101 is facilitated.

[0068] For step S102, since the outlet of the flow passage 101 is also horn-shaped, gradually expanding from the inlet end to the outlet end, by directly turning the contour of the outlet of the flow passage 101 using a lathe, the workload of subsequent electrode processing can be reduced, thereby improving the processing efficiency.

[0069] Further, the step S200 includes the following steps:

[0070] S201, designing a first rough machining electrode, the outlet point of the upper contour 102 of the flow passage 101 in the design size state is tangent to a first tangent line, and the upper contour 102 of the flow passage 101 is offset by 0.5mm along the horizontal direction to the lower flow passage 101 with the first tangent line as the starting end, to form the upper contour of the first rough machining electrode; a vertical line is drawn on the lower contour 103 of the flow passage 101 in the design size state, and a turning point where the vertical line intersects with one point and two points of the upper contour 102 of the flow passage 101 is found, the vertical line passing through the turning point is a second tangent line, and the part of the lower contour 103 of the flow passage 101 intersecting with the second tangent line is offset by 0.4-0.5mm along the horizontal direction to the upper flow passage 101 with the second tangent line as the starting end, to form the lower contour 103 of the first rough machining electrode;

[0071] S202, the designed first rough machining electrode 200 is inserted into the blank passage 104 and moved along the vertical direction by a mechanical hand to perform the initial processing of the blank passage 104, and the removal of the part of the flow passage 101 is completed to form the initial processing flow passage.

[0072] In the present embodiment, the first rough machining electrode 200 is used to process the outlet end of the blank passage 104 with a large amount of processing, and the lower contour of the first rough machining electrode 200 is a one-dimensional motion in the vertical direction to remove the contour of the flow passage 101.

[0073] For step S201 and step S202, the design of the first rough machining electrode 200 can be such that the first rough machining electrode 200 directly performs spark machining by extending into the flow channel 101 at the outlet in the vertical direction, to complete the large amount of cutting of the outlet end of the flow channel 101 and improve the machining efficiency.

[0074] Further, the step S300 further includes: moving the second rough machining electrode in the horizontal direction in the rough machining flow channel by the mechanical hand control, and reserving a machining allowance of 0.1-0.15 mm to complete the semi-finishing of the flow channel 101 to form a semi-finished flow channel.

[0075] In the embodiment, the semi-finishing is still operated by the second rough machining electrode 201, the movement of the second rough machining electrode 201 is driven by setting the movement parameters of the mechanical hand, and the machining allowance of 0.1-0.15 mm is reserved after machining, so that the semi-finishing can reduce the workload of the electrode in subsequent finishing and improve the machining efficiency.

[0076] Referring to Figures 4-5 , further, the step S400 includes the following steps:

[0077] S401, design the first finishing electrode, offset the upper profile 102 of the flow channel 101 in the design size state in the horizontal direction towards the lower profile 103 of the flow channel 101 by 0.1 mm to form the upper profile of the first finishing electrode, and offset the lower profile 103 of the flow channel 101 in the design size state in the horizontal direction towards the upper flow channel 101 by 0.1 mm to form the lower profile of the first finishing electrode;

[0078] S402, the first finishing electrode is designed to perform primary finishing on the semi-finished flow channel, so that the surface roughness of the flow channel 101 is machined to Ra1.6 to form a finished flow channel;

[0079] S403, design the second finishing electrode 300, the second finishing electrode is provided with a chamfer groove 301, and the profile of the chamfer groove 301 matches the round corner at the inlet of the flow channel 101 in the design state;

[0080] S404, the upper profile 102 and the lower profile 103 of the inlet end of the finished flow channel are chamfered by the second finishing electrode 300 to form the flow channel 101 that meets the design size requirements.

[0081] In the embodiment, the profile of the first finishing electrode is consistent with the profile of the flow channel 101, and the size is obtained by narrowing inwardly by 0.1 mm of the flow channel 101, the first finishing electrode is processed along the profile of the flow channel 101 to move in two dimensions, the flow channel 101 is processed to the designed size, at the same time, the surface roughness of the flow channel 101 is processed to Ra1.6, and then the second finishing electrode 300 is used to open the fillet at the top end of the inlet of the flow channel 101. The fillet at the inlet reduces the resistance of the gas entering when the diffuser casing is used, and on the other hand, it is convenient for the subsequent abrasive flow to enter the flow channel 101 to grind the flow channel 101.

[0082] Further, the step S500 comprises the following steps:

[0083] S501, the radial diffuser casing 100 after the flow channel 101 is finished is installed on the abrasive flow clamp, and the radial diffuser casing 100 is fixed axially, circumferentially and radially relative to the abrasive flow clamp;

[0084] S502, the abrasive flow is injected into the flow channel 101, and the pressure of the abrasive, the volume of the abrasive per stroke and the cycle number are set to ensure that the roughness of the flow channel 101 after being ground by the abrasive is processed to Ra0.8.

[0085] In the embodiment, after the radial diffuser casing 100 is fixed by the abrasive flow clamp, the flow channel 101 is repeatedly ground by the abrasive, so that the surface roughness of the flow channel 101 reaches the design requirement Ra0.8, the abrasive pressure is set to 200-210PSI, the volume of the abrasive per stroke is the containing volume of the flow channel 101, and the cycle number is obtained by dividing the total amount to be ground by the grinding amount of each abrasive flow.

[0086] As shown in Figure 7 , the abrasive grains enter from the inclined circular arc through slot on the part cover plate 402, are introduced into the part flow channel 101 through the inclined 60° inclined port of the support block 502, pass through the part flow channel 101, then enter the impeller 603 from the outlet of the flow channel 101, and are guided to the equipment abrasive storage tank through the impeller 603 to complete a cycle. The machine is set to automatic, the machine is operated according to the cycle number of the machine, until the machining is completed, and finally the machined surface of the part flow channel 101 is checked whether it meets the roughness requirement.

[0087] Further, the pressure of the abrasive used for grinding the flow channel 101 is 200-210PSI.

[0088] Referring to Figure 7According to another aspect of the present application, there is further provided an abrasive flow clamp for clamping the expanding chamber 100 and guiding the abrasive flow to machine the flow passage 101 of the expanding chamber 100, comprising a base 400, a limiting assembly, the base 400 is provided with a connecting cylinder 401 coaxial with the base 400, the top of the connecting cylinder 401 is provided with an upper cover plate 402, the upper cover plate 402 is provided with a plurality of abrasive passages 403, the abrasive passages 403 are used for injecting abrasive and flowing into the flow passage 101 of the expanding chamber 100; the limiting assembly comprises a lower limiting part 500 arranged on the base 400 for radially limiting the lower part of the expanding chamber 100 and an upper limiting part 600 arranged on the upper cover plate 402 for radially limiting the upper part of the expanding chamber 100, the expanding chamber 100 is clamped between the upper limiting part 600 and the lower limiting part 500 to position the expanding chamber 100 radially relative to the base 400, and the lower limiting part 500 is provided with an angular hole for circumferentially limiting the expanding chamber 100.

[0089] In the embodiment, the abrasive flow clamp is used for clamping the expanding chamber 100 to be machined and guiding the abrasive to machine the flow passage 101, and the whole clamp is placed above the working abrasive cylinder on the machine tool. Specifically, the abrasive passages 403 on the upper cover plate 402 are six fan-shaped windows, which are circumferentially distributed, and are used for aligning the working abrasive cylinder port of the abrasive flow equipment, so that the abrasive injected by the abrasive cylinder flows into the flow passage 101 of the expanding chamber 100 through the fan-shaped windows of the upper cover plate 402.

[0090] Specifically, when installing the expanding chamber 100, first place the expanding chamber 100 on the lower limiting part 500, then rotate the expanding chamber 100, align the positioning hole on the expanding chamber 100 with the angular hole on the lower limiting part 500, and then sequentially pass through the screws or bolts to limit the circumferential direction of the expanding chamber 100, and the lower part of the expanding chamber 100 is radially limited by the lower limiting part 500, then install the upper limiting part 600 and the upper cover plate 402 to limit the axis and the upper part of the expanding chamber 100 radially, and in actual installation, the upper limiting part 600 can be installed on the upper cover plate 402 first, and then installed on the connecting cylinder 401 together with the upper cover plate 402. Through the abrasive flow clamp, the expanding chamber 100 is fixed axially, circumferentially and radially relative to the abrasive flow clamp, so as to ensure that the position of the flow passage 101 does not change during abrasive machining, so as to ensure the machining effect of the roughness of the flow passage 101.

[0091] Further, the lower limit part 500 comprises a lower protection block 501 fixed on the base 400 and a supporting block 502, the lower protection block 501 is used to abut against the inner circle stop of the lower part of the radial expander case 100, and the supporting block 502 is used to abut against the outer circle of the lower part of the radial expander case 100.

[0092] In the embodiment, the lower protection block 501 and the supporting block 502 are both annularly arranged, the lower protection block 501 is used to abut against the inner circle stop of the lower part of the radial expander case 100, the supporting block 502 is used to abut against the outer circle of the lower part of the radial expander case 100, and the supporting block 502 is arranged close to the inlet of the flow channel 101, and the end of the supporting block 502 close to the inlet of the flow channel 101 is provided with a slope used to guide the abrasive.

[0093] Further, the upper limit part 600 comprises an upper protection block 601 fixed on the upper cover plate 402, a mounting ring 602 arranged on the upper protection block 601, and an impeller 603 arranged on the mounting ring 602, the mounting ring 602 is used to abut against the outer circle of the upper part of the radial expander case 100, and the impeller 603 is used to abut against the inner circle of the upper part of the radial expander case 100. In the embodiment, the top end of the upper protection block 601 is connected with the upper cover plate 402, the bottom end of the upper protection block 601 is connected with the mounting ring 602, the mounting ring 602 is provided with a ring groove abutting against the outer circle of the upper part of the radial expander case 100, and the mounting ring 602 is further provided with the impeller 603 coaxial with the inner circle of the radial expander case 100, so as to ensure the radial limitation of the radial expander case 100.

[0094] The above only describes the preferred embodiments of the present application and is not used to limit the present application, and the present application can have various modifications and changes for those skilled in the art. 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 process for machining a flow channel (101) on a radial expander housing (100), characterized in that, The method comprises the following steps: S100, adopting machining to groove the blank passage (104) on the radial expansion machine case (100); S200, designing the first rough machining electrode (200), and extending the first rough machining electrode (200) from the outlet of the blank passage (104) in the vertical direction to perform primary machining on the blank passage (104), and removing part of the excess amount of the blank passage (104) to form a primary machining flow channel; the step S200 comprises the following steps: S201, designing the first rough machining electrode (200), making the outlet point of the upper profile (102) of the flow channel (101) in the designed size state tangent to the first tangent line of the upper profile (102) of the flow channel (101), and offsetting the upper profile (102) of the flow channel (101) downward by 0.5 mm in the horizontal direction to form the upper profile of the first rough machining electrode (200); making a vertical line on the lower profile (103) of the flow channel (101) in the designed size state, and finding the inflection point where the vertical line intersects with one point and two points of the upper profile (102) of the flow channel (101), and offsetting the part of the lower profile (103) of the flow channel (101) intersecting with the second tangent line by 0.4-0.5 mm in the horizontal direction to the upper flow channel (101) to form the lower profile (103) of the first rough machining electrode (200); S202, extending the designed first rough machining electrode (200) into the blank passage (104) and moving in the vertical direction controlled by the mechanical hand to perform primary machining on the blank passage (104), and removing part of the excess amount of the flow channel (101) to form a primary machining flow channel; S300, designing the second rough machining electrode (201), offsetting the upper profile of the flow channel (101) in the designed size state by 0.4-0.5 mm in the horizontal direction to the lower profile (103) of the flow channel (101) to form the upper profile of the second rough machining electrode, offsetting the lower profile (103) of the flow channel (101) in the designed size state by 0.4-0.5 mm in the horizontal direction to the upper profile (102) of the flow channel (101) to form the lower profile of the second rough machining electrode (201), and extending the designed second rough machining electrode into the primary machining flow channel and moving in two dimensions along the flow channel (101) controlled by the mechanical hand, and reserving 0.3-0.5 mm of machining excess amount to form a rough machining flow channel; S400, adopting the electrode to perform electrolytic machining on the rough machining flow channel machined in step S300 to form a flow channel (101) meeting the design size requirement; S500, clamping the radial expansion machine case (100) by adopting the abrasive grain flow clamp, and guiding the abrasive grain flow to process the roughness of the flow channel (101) to Ra0.

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2. The flow passage machining process for a sizing chamber according to claim 1, characterized by, The step S100 comprises the following steps: S101, using a drill to drill the pre-processed flow passage (101) of the designed size of the diameter expansion machine case (100), and process the blank passage (104) with a diameter of 6.4-6.6mm; S102, using a lathe to turn the outlet of the blank passage (104), and process the horn mouth (105) with an opening angle of 25°.

3. The flow passage machining process for a sizing chamber according to claim 1, wherein The step S300 further includes: moving the second rough machining electrode in the horizontal direction in the rough machining flow passage through the mechanical hand control, reserving a machining allowance of 0.1-0.15mm, to complete the semi-finishing of the flow passage (101) to form a semi-finished flow passage.

4. The flow passage machining process for a sizing chamber according to claim 3, wherein The step S400 includes the following steps: S401, design the first finishing electrode, offset the upper contour (102) of the flow passage (101) in the designed size state by 0.1mm along the horizontal direction towards the lower contour (103) of the flow passage (101) to form the upper contour of the first finishing electrode, offset the lower contour (103) of the flow passage (101) in the designed size state by 0.1mm along the horizontal direction towards the upper contour (102) of the flow passage (101) to form the lower contour of the first finishing electrode; S402, use the designed first finishing electrode to perform the first finishing on the semi-finished flow passage, so that the surface roughness of the flow passage (101) is processed to Ra1.6 to form a finished flow passage; S403, design the second finishing electrode (300), the second finishing electrode is provided with a chamfer groove (301), and the contour of the chamfer groove (301) matches the round corner at the inlet of the flow passage (101) in the designed state; S404, use the second finishing electrode (300) to open the round corner of the upper contour (102) and the lower contour (103) of the inlet end of the finished flow passage, to form the flow passage (101) that meets the design size requirement.

5. The flow passage machining process for a sizing chamber according to claim 1, wherein The step S500 includes the following steps: S501, install the diameter expansion machine case (100) with the finished flow passage (101) on the abrasive flow clamp, and fix the diameter expansion machine case (100) axially, circumferentially and radially relative to the abrasive flow clamp; S502, use the abrasive material to inject the flow passage (101), and set the pressure of the abrasive material, the volume of the abrasive material per stroke, and the cycle number, to ensure that the roughness of the flow passage (101) after abrasive grinding is processed to Ra0.

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6. The flow passage machining process for a sizing chamber according to claim 5, wherein The pressure of the abrasive material used for grinding the flow passage (101) is 200-210PSI.

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