Correcting tool for ring section precision casting

Abstract

The invention belongs to the technical field of precision casting, and discloses a correction tool for a ring section precision casting, which comprises a base frame and a press execution module, a replaceable arc-shaped mold is arranged on the base frame, and rapid replacement and adaptation to castings with different radians are realized through a guide slide rail and a quick release locking assembly; the two-way thread driving modules on the two sides drive the transverse clamping mechanism to adjust the distance, and axial limiting of the casting is achieved. The inner side elastic side limiting mechanism adopts a limiting baffle with a fillet and a hydraulic damper to be matched with a reset spring, so that indentation is prevented, and stable limiting is achieved; the press execution module uniformly applies pressure for correction through an arc-shaped pressure head; compared with the prior art, the tool solves the problems that a traditional tool is poor in universality and prone to damage a casting, has the advantages of being replaceable in die, adjustable in clamping, capable of limiting and preventing marks, accurate in correction and the like, and is suitable for efficient correction of diversified ring section castings.

Description

Technical Field

[0001] The present invention relates to the technical field of precision casting, in particular to an adjustable correction tool for gas turbine ring segment castings, and is particularly suitable for deformation correction of cambered surface castings of various specifications. Background Art

[0002] As a core component of a gas turbine engine, the performance of the gas turbine combustion chamber directly affects the overall operating efficiency and reliability of the unit. Ring segment precision castings, key components of the combustion chamber, are characterized by their small thickness, large area, and fixed curvature. During the solidification process after casting, structural differences between the various parts lead to inconsistent shrinkage, making dimensional deviations and curvature deformation very likely to occur. Traditional dimensional control methods primarily involve adding a counter-deformation during the wax mold pressing process, but the deformation amplitude is difficult to accurately control during the cooling process, and the correction effect is limited.

[0003] In the existing technology, such as the utility model patent with announcement number CN211413234U authorized by Anhui Yingliu Hangyuan Power Technology Co., Ltd. in 2020, although the correction tool disclosed therein can achieve basic correction of ring segment castings, the curvature of the curved table top of its correction base is fixed and cannot be replaced, and the positions of the limiting columns and limiting protrusions are also fixed, resulting in the tool being able to only correct castings of a single specification, and having a narrow scope of application. At the same time, the top surfaces of the ring segment limiting protrusions on both sides are horizontal planes, which will form right-angled sharp sections when they collide with the inclined surfaces of the side ends of the castings. During the curvature correction process, it is very easy to produce indentations on the edges of the castings, which increases the difficulty of later processing and may even affect the performance and service life of the castings. In addition, the tooling as a whole adopts an one-piece molding structure. When it is necessary to correct castings of different specifications, new tooling needs to be remanufactured, which not only increases production costs but also takes up more production space.

[0004] With the continuous development of gas turbine technology, the requirements for the precision of ring segment castings are increasing, and the specifications of castings are gradually diversified. The shortcomings of traditional correction tooling in terms of versatility, correction accuracy and casting protection are becoming more and more obvious. There is an urgent need for a new type of correction tooling that can adapt to castings of different specifications, has good correction effect and is not easy to damage castings. Summary of the Invention

[0005] 1. Technical problems to be solved: In view of the deficiencies in the prior art, the present invention provides a correction tool for ring segment precision castings to solve the problems of poor versatility, easy damage to castings and narrow scope of application of the existing correction tool.

[0006] 2. Technical solution: To solve the above problems, the present invention adopts the following technical solutions.

[0007] A correction tool for ring segment precision castings, including a base frame and a press execution module, The base frame is provided with a replaceable arc-shaped mold, whose working surface is a correction arc surface matching the casting; bidirectional threaded drive modules are symmetrically arranged on both sides of the base frame, including a bidirectional screw and two transmission sleeves that can move in opposite directions; each transmission sleeve is connected to a transverse clamping mechanism, which is used for axial limitation of the casting along the circumference of the ring segment casting; an elastic side limiting mechanism is arranged on the inner side of the bidirectional threaded drive module, including an elastic reset unit and a limiting baffle with a rounded corner structure.

[0008] A further improvement is that the base frame is provided with a mold accommodating groove, and guide slide rails are opened on both sides of the mold accommodating groove; the replaceable arc mold is slidably embedded in the guide slide rails, and the positioning of the replaceable arc mold is achieved through a front-end quick-release locking assembly.

[0009] A further improvement is that the quick-release locking assembly includes: a limiting pressure plate, a pair of slide rail blocks are provided on the back of the pressure plate; and locking bolts are sequentially passed through the T-shaped lock holes of the pressure plate and screwed into the threaded fixing holes of the base frame.

[0010] A further improvement is that the bidirectional thread drive module includes: a drive housing fixed on both sides of the base frame; the bidirectional screw is rotatably supported in the drive housing through bearings, and the transmission sleeve is installed on the outer end of the bidirectional screw for forward and reverse rotation; and the drive motor is connected to the end of the bidirectional screw.

[0011] A further improvement is that the transverse clamping mechanism includes: a base connecting block fixedly connected to the transmission sleeve; a sleeve-type telescopic rod group, which is composed of a fixed sleeve and a sliding inner rod; and a pressure plate with an adjustable hinge angle at the end of the sliding inner rod.

[0012] A further improvement is that the sleeve-type telescopic rod assembly is provided with a length locking mechanism, which includes: a pin hole opened in the fixed sleeve; an adjustment tooth groove distributed on the sliding inner rod; and a positioning pin passing through the pin hole and the tooth groove.

[0013] A further improvement is that the elastic reset unit includes a hydraulic damper fixed on the inside of the drive housing and a reset spring sleeved on the outside of the hydraulic damper, one end of the reset spring is fixed to the drive housing and the other end is connected to the limit baffle, and the inner end of the limit baffle is connected to the piston rod of the hydraulic damper.

[0014] A further improvement is that the return spring is normally compressed to drive the limit baffle to be pre-tightened in the direction of the casting.

[0015] A further improvement is that the press execution module includes: a press body fixed to the rear end of the base frame; a symmetrically arranged double-acting hydraulic cylinder; and an arc-shaped pressure head connected to the piston rod of the hydraulic cylinder.

[0016] A further improvement is that downward pressing execution blocks are provided on both sides of the bottom of the arc-shaped pressure head, and an anti-slip pressure head is provided on the bottom surface.

[0017] 3. Beneficial effects: Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects: (1) The present invention adopts the design of a replaceable arc mold. Workers can quickly replace the correction mold with the corresponding arc according to the correction requirements of castings of different specifications, which significantly improves the versatility of the tooling, avoids the tedious process of re-manufacturing the tooling due to different casting specifications, reduces production costs, and reduces the occupation of production space.

[0018] (2) The cooperation between the bidirectional thread drive module and the transverse clamping mechanism can realize the axial clamping limit of castings of different sizes. The bidirectional lead screw is driven by the drive motor to rotate, so that the transmission sleeve drives the transverse clamping mechanism to move relative to it, thereby flexibly adjusting the clamping position to meet the correction requirements of castings of various specifications, thereby improving the applicability of the tooling.

[0019] (3) The rounded corner structure design of the limit baffle in the elastic side limit mechanism avoids right-angled collision with the side end of the casting, effectively preventing the formation of indentations on the edge of the casting during the correction process, protecting the surface quality of the casting, and reducing the post-processing process. At the same time, the preload effect of the return spring and the buffering effect of the hydraulic damper enable the limit baffle to always stably limit the side position of the casting, ensuring the stability and reliability of the correction process.

[0020] In summary, the correction tooling of the present invention has the advantages of strong versatility, good correction effect, and not easy to damage castings. It can meet the correction needs of various ring segment precision castings and has significant economic benefits and value. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic structural diagram of the present invention as a whole; Figure 2 This is a schematic diagram of the structure of the casting to be corrected being placed on a replaceable arc-shaped mold according to the present invention; Figure 3 It is a structural schematic diagram of the base frame of the present invention; Figure 4 This is a structural diagram of the bidirectional thread drive module of the present invention; Figure 5 It is a structural schematic diagram of the transverse clamping mechanism of the present invention; Figure 6 It is a structural schematic diagram of the elastic side limiting mechanism of the present invention; Figure 7 It is a structural schematic diagram of the press execution module of the present invention.

[0022] Description of the numbers in the figure: 1. Base frame; 11. Mold accommodating groove; 12. Guide rail; 13. Threaded fixing hole; 14. Limiting pressure plate; 15. Slide rail block; 16. T-shaped lock hole; 17. Locking bolt; 2. Interchangeable arc mold; 3. Bidirectional thread drive module; 31. Drive housing; 32. Bidirectional lead screw; 33. Transmission sleeve; 34. Drive motor; 4. Horizontal clamping mechanism; 41. Base connecting block; 42. Fixed sleeve; 43. Sliding inner rod; 44. Pin hole; 45. Adjusting tooth groove; 46. Positioning pin; 47. Angle-adjustable pressure plate; 5. Elastic side limit mechanism; 51. Hydraulic damper; 52. Limit baffle; 53. Return spring; 6. Press execution module; 61. Press body; 62. Double-acting hydraulic cylinder; 63. Arc-shaped pressure head; 64. Down-pressing execution block; 65. Anti-slip pressure head. DETAILED DESCRIPTION

[0023] To facilitate understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. Several embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0024] See also Figure 1-Figure 7 A correction tool for ring segment precision castings, comprising a base frame 1 and a press execution module 6, The base frame 1 is provided with a replaceable arc mold 2, whose working surface is a correction arc surface matching the casting; a bidirectional threaded drive module 3 is symmetrically arranged on both sides of the base frame 1, including a bidirectional screw 32 and two transmission sleeves 33 that can move in opposite directions; each transmission sleeve 33 is connected to a transverse clamping mechanism 4 for axial limitation of the casting; an elastic side limiting mechanism 5 is arranged on the inner side of the bidirectional threaded drive module 3, including an elastic reset unit and a limit baffle 52 with a rounded corner structure.

[0025] More specifically, the base frame 1 is provided with a mold accommodating groove 11, and guide rails 12 are opened on both sides of the mold accommodating groove 11; the replaceable arc mold 2 is slidably embedded in the guide rails 12, and the positioning of the replaceable arc mold 2 is achieved through a front-end quick-release locking assembly.

[0026] More specifically, the quick-release locking assembly includes: a limiting pressure plate 14 with a pair of slide rail blocks 15 on the back; and locking bolts 17 passing through the T-shaped locking holes 16 of the pressure plate and screwed into the threaded fixing holes 13 of the base frame 1 in sequence.

[0027] During use of this solution, the base frame 1 serves as the basic support structure of the tooling, and is used to install the replaceable arc mold 2 and other functional modules; the working surface of the replaceable arc mold 2 is a correction arc surface that matches the casting. By replacing molds with different curvatures, the curvature correction of ring segment castings of various specifications can be achieved.

[0028] Compared with the fixed-radian correction base in the prior art, the interchangeable design of this solution significantly improves the versatility of tooling and reduces the cost and space occupied by customized tooling for castings of different specifications.

[0029] A mold receiving groove 11 is provided at the upper end of the base frame 1 , and guide rails 12 are provided on the inner walls on both sides. The replaceable arc-shaped mold 2 is embedded in the receiving groove through the rails to achieve horizontal sliding.

[0030] The front end of the mold is fixed by a quick-release locking assembly: the slide rail block 15 on the back of the limiting pressure plate 14 is inserted into the guide slide rail 12, and the locking bolt 17 passes through the T-shaped lock hole 16 of the pressure plate and is tightened with the threaded fixing hole 13 of the base frame 1 to make the mold flush with the top surface of the base frame 1.

[0031] The mold receiving groove 11 and the guide rail 12 define the installation position of the mold. The quick-release locking assembly ensures the stability of the mold during calibration. When disassembling, the mold can be quickly replaced by simply loosening the bolts.

[0032] See also Figure 1-2 and Figure 4-5 The bidirectional thread drive module 3 includes: a drive housing 31 fixed on both sides of the base frame 1; the bidirectional screw 32 is rotatably supported in the drive housing 31 through bearings, and the transmission sleeve 33 is installed on the outer end of the forward and reverse rotating thread of the bidirectional screw 32; and the drive motor 34 is connected to the end of the bidirectional screw 32.

[0033] More specifically, the transverse clamping mechanism 4 includes: a base connecting block 41 fixedly connected to the transmission sleeve 33; a sleeve-type telescopic rod group, which is composed of a fixed sleeve 42 and a sliding inner rod 43; and a pressure plate 47 with an adjustable angle at the end of the sliding inner rod 43.

[0034] More specifically, the telescopic rod assembly is provided with a length locking mechanism, including: a pin hole 44 provided in the fixed sleeve 42 ; an adjustment tooth groove 45 distributed on the sliding inner rod 43 ; and a positioning pin 46 passing through the pin hole 44 and the tooth groove 45 .

[0035] During use of this solution, the bidirectional threaded drive module 3 drives the transmission sleeve 33 to move in opposite directions through the rotation of the bidirectional screw 32, driving the transverse clamping mechanism 4 to adjust the spacing, thereby achieving axial front and rear clamping and limiting of castings of different sizes, preventing the castings from shifting during correction.

[0036] Compared with the fixed-position limit columns in the existing technology, the adjustable clamping mechanism is suitable for castings of various specifications, without the need to re-manufacture tooling, thereby improving production efficiency.

[0037] The driving housing 31 of the bidirectional thread driving module 3 is fixed to the left and right sides of the base frame 1, the bidirectional lead screw 32 is horizontally installed in the housing through bearings, and the transmission sleeve 33 is sleeved on the forward and reverse rotation sections of the lead screw and is threadedly connected to the lead screw.

[0038] The base connecting block 41 of the transverse clamping mechanism 4 is fixedly connected to the upper end of the transmission sleeve 33, the fixed sleeve 42 is vertically installed on the inner side of the connecting block, the sliding inner rod 43 is inserted into the sleeve and the length is locked by the positioning pin 46, and the angle-adjustable pressure plate 47 is hinged to the end of the inner rod to adjust the angle of the pressure plate.

[0039] During this process, the motor 34 can be driven to drive the bidirectional screw 32 to rotate, so that the transmission sleeves 33 on both sides move synchronously in opposite directions or opposite directions, and the spacing of the horizontal clamping mechanism 4 is adjusted; the sliding inner rod 43 can adjust the extension length according to the thickness of the casting, and the angle-adjustable pressure plate 47 fits the side of the casting to achieve stable clamping.

[0040] See also Figure 1-2 and Figure 6 The elastic side limiting mechanism 5 includes: a hydraulic damper 51 fixed on the inner side of the driving housing 31; a limiting baffle 52 connected to the piston rod of the hydraulic damper 51; and a return spring 53 sleeved on the outside of the hydraulic damper 51.

[0041] More specifically, the return spring 53 is normally compressed to drive the limit baffle 52 to be pre-tightened toward the casting.

[0042] During use of this solution, the elastic side limit mechanism 5 elastically limits the left and right sides of the casting through the limit baffle 52 to prevent the casting from lateral displacement during correction; the rounded corner structure of the limit baffle 52 avoids right-angled collision with the side end of the casting to prevent indentation; the return spring 53 cooperates with the hydraulic damper 51 to provide preload and buffering to ensure stable limiting.

[0043] In the existing technology, the horizontal surface of the limiting protrusion is prone to cause indentations in the casting. This design protects the surface quality of the casting and reduces the post-processing process through the rounded corner structure and elastic reset mechanism.

[0044] The hydraulic damper 51 is horizontally fixed inside the driving housing 31 , with the piston rod facing the casting, and the limit baffle 52 is fixedly connected to the end of the piston rod.

[0045] The return spring 53 is sleeved on the outside of the hydraulic damper 51, with its two ends respectively fixed to the drive housing 31 and the limit baffle 52. It is in a compressed state under normal conditions, pushing the limit baffle 52 to pre-tighten the side of the casting.

[0046] When the casting is placed on the mold, the limit baffle 52 fits the side end of the casting under the action of the spring preload; during the correction process, the deformation of the casting drives the baffle to move slightly, and the hydraulic damper 51 provides buffering to avoid rigid conflict and damage to the casting while maintaining the limiting force.

[0047] See also Figure 1-2 and Figure 7 The press execution module 6 includes: a press body 61 fixed to the rear end of the base frame 1; a symmetrically arranged double-acting hydraulic cylinder 62; and an arc-shaped pressing head 63 connected to the piston rod of the hydraulic cylinder.

[0048] More specifically, downward pressing blocks 64 are provided on both sides of the bottom of the arc-shaped pressing head 63 , and an anti-slip pressing head 65 is provided on the bottom surface thereof.

[0049] During use of this solution, the press execution module 6 drives the arc-shaped pressing head 63 downward through the hydraulic cylinder to apply a correction force to the casting, so that the casting fits the arc surface of the mold and completes the curvature correction.

[0050] The arc-shaped pressure head 63 matches the arc surface of the casting, and cooperates with the downward pressing execution block 64 and the anti-slip pressure head 65 to ensure that the correction force is evenly distributed and improve the correction accuracy.

[0051] The press body 61 is fixed to the rear end of the base frame 1, and the double-acting hydraulic cylinder 62 is vertically installed inside the press. The piston rod is downwardly connected to the arc-shaped pressure head 63, and the arc surface of the bottom of the pressure head is consistent with the curvature of the mold correction arc surface.

[0052] The downward pressing execution blocks 64 are symmetrically arranged on both sides of the bottom of the arc-shaped pressure head 63, and the bottom anti-slip pressure head 65 adopts rubber or tooth-shaped structure to increase the friction with the casting.

[0053] The hydraulic system drives the piston rod of the hydraulic cylinder 62 to extend, driving the arc-shaped pressure head 63 to press down, and the anti-slip pressure head 65 presses against the surface of the casting. Through the dual arc surface action of the mold and the pressure head, the casting is forced to produce plastic deformation to complete the correction.

[0054] Overall work steps S1. Mold replacement and installation: According to the specifications of the casting to be corrected, loosen the locking bolts 17, remove the old mold, slide the replaceable curved mold 2 of the corresponding curvature along the guide rail 12 into the mold accommodating groove 11, and fix it with the limiting pressure plate 14 and locking bolts 17.

[0055] S2. Adjustment of the clamping mechanism: Start the drive motor 34 and adjust the spacing of the transmission sleeve 33 through the bidirectional lead screw 32 so that the angle-adjustable pressure plate 47 of the transverse clamping mechanism 4 is aligned with the front and rear sides of the casting; according to the thickness of the casting, adjust the extension length of the sliding inner rod 43 and insert the positioning pin 46 to lock it, and rotate the angle-adjustable pressure plate 47 so that it is vertically attached to the edge of the casting.

[0056] S3. Side limit pre-tightening: The casting is placed on the arc surface of the mold. The limit baffle 52 of the elastic side limit mechanism 5 automatically fits the left and right sides of the casting under the action of the return spring 53. The hydraulic damper 51 provides buffering to ensure the stable position of the casting.

[0057] S4. Correction and downward pressure: Start the press execution module 6, the hydraulic cylinder 62 drives the arc-shaped pressing head 63 to slowly press down, and after the anti-slip pressing head 65 contacts the casting, it applies uniform pressure through the arc surface, so that the casting gradually fits the arc surface of the mold; maintain the pressure until the casting is fixed, then retract the hydraulic cylinder and take out the corrected casting.

[0058] S5, tooling reset: release the transverse clamping mechanism 4, drive the motor 34 to reset the transmission sleeve 33, and prepare for the next calibration.

[0059] The above-mentioned embodiments only express a certain implementation method of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the patent scope of the present invention. It should be pointed out that for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent of the present invention shall be based on the attached claims.

Claims

1. A correction tool for ring segment precision castings, comprising a base frame (1) and a press execution module (6), characterized in that: The base frame (1) is provided with a replaceable arc-shaped mold (2), the working surface of which is a correction arc surface matching the casting; A bidirectional thread drive module (3) is symmetrically arranged along the central axis of the base frame (1), comprising a bidirectional lead screw (32) and two transmission sleeves (33) that can move in opposite directions; Each transmission sleeve (33) is connected to a transverse clamping mechanism (4) and is used for axially limiting the casting along the circumference of the ring segment casting; An elastic side limiting mechanism (5) is provided inside the bidirectional thread drive module (3), comprising an elastic reset unit and a limiting baffle (52) with a rounded corner structure.

2. A correction tool for ring segment precision casting according to claim 1, characterized in that: The base frame (1) is provided with a mold accommodating groove (11), and guide rails (12) are provided on both sides of the mold accommodating groove (11); The replaceable arc-shaped mold (2) is slidably embedded in the guide rail (12), and the positioning of the replaceable arc-shaped mold (2) is achieved through a front-end quick-release locking assembly.

3. The correction tool for ring segment precision casting according to claim 2, characterized in that: The quick-release locking assembly comprises: A limiting pressure plate (14) is provided with a pair of slide rail blocks (15) on the back thereof; The locking bolts (17) are sequentially passed through the T-shaped locking holes (16) of the pressure plate and screwed to the threaded fixing holes (13) of the base frame (1).

4. The correction tool for ring segment precision casting according to claim 1, characterized in that: The bidirectional thread drive module (3) comprises: A drive housing (31) fixed on both sides of the base frame (1); The bidirectional lead screw (32) is rotatably supported in the drive housing (31) via a bearing, and the transmission sleeve (33) is mounted on the outer end of the bidirectional lead screw (32) for forward and reverse rotation. The driving motor (34) is connected to the end of the bidirectional lead screw (32).

5. The correction tool for ring segment precision casting according to claim 1, characterized in that: The transverse clamping mechanism (4) comprises: A base connecting block (41) fixedly connected to the transmission sleeve (33); A telescopic rod assembly comprising a fixed sleeve (42) and a sliding inner rod (43); The end of the sliding inner rod (43) is hinged to an angle-adjustable pressure plate (47), and the angle-adjustable pressure plate (47) is hinged to the end of the sliding inner rod (43) through a pin shaft, and a limit bolt is provided at the outer end of the angle-adjustable pressure plate (47) to lock the rotation angle.

6. A correction tool for ring segment precision casting according to claim 5, characterized in that: The telescopic rod assembly is provided with a length locking mechanism, comprising: A pin hole (44) is provided in the fixed sleeve (42); Adjustment teeth (45) distributed on the sliding inner rod (43); A positioning pin (46) passes through the pin hole (44) and the tooth groove (45).

7. The correction tool for ring segment precision casting according to claim 1, characterized in that: The elastic reset unit comprises a hydraulic damper (51) fixed on the inner side of the driving housing (31), and a reset spring (53) sleeved on the outside of the hydraulic damper (51), wherein one end of the reset spring (53) is fixed to the driving housing (31), and the other end is connected to the limit baffle (52), and the inner end of the limit baffle (52) is connected to the piston rod of the hydraulic damper (51).

8. The correction tool for ring segment precision casting according to claim 7, characterized in that: The return spring (53) is normally compressed to drive the limit baffle (52) to be pre-tightened in the direction of the casting.

9. The correction tool for ring segment precision casting according to claim 1, characterized in that: The press execution module (6) comprises: A press body (61) fixedly mounted on the rear end of the base frame (1); A symmetrically arranged double-acting hydraulic cylinder (62); The arc-shaped pressure head (63) is connected to the piston rod of the hydraulic cylinder.

10. The correction tool for ring segment precision casting according to claim 9, characterized in that: The arc-shaped pressure head (63) is provided with downward pressing execution blocks (64) on both sides of its bottom, and an anti-slip pressure head (65) is provided on its bottom surface.

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