Self-adaptive flexible clamping device suitable for grinding deformed thin-wall curved-surface blade boss

Abstract

The utility model relates to the technical field of aero-engine blade repair, and particularly discloses a self-adaptive flexible clamping device suitable for deformed thin-wall curved surface blade boss grinding, according to the self-adaptive flexible clamping device, a mortise is formed in the left end face of a tailstock, one end of the mortise extends to the side edge of the tailstock, and the mortise is coupled with a tenon of a blade; the first jacking component is arranged on the tailstock, and a first piston rod arranged in the first jacking component is located on the right side of the mortise and extends towards the direction of the mortise; the blade body auxiliary supporting mechanism comprises a first baffle and a second baffle which are oppositely arranged, the right end of the first baffle and the right end of the second baffle are both connected with the tailstock, the first baffle and the second baffle are both provided with second jacking components, and second piston rods of the oppositely-arranged second jacking components extend in the opposite direction. The problem that in the prior art, a self-adaptive flexible clamping device suitable for grinding a deformed thin-wall curved-surface blade boss is urgently needed, and the problem that the grinding precision of a blade is poor due to deformation, clamping positioning and chattering is solved.

Description

Technical Field

[0001] The present application relates to the technical field of aero-engine blade repair, and specifically relates to an adaptive flexible clamping device applicable to grinding of bosses of deformed thin-walled curved surface blades. Background Art

[0002] Low-pressure rotor blades with bosses are widely used in the field of aero-engines. For repaired blades, in order to effectively ensure the mating relationship of the low-pressure rotor blades, within a single life cycle, it is necessary to "weld + machining" the boss size to meet the drawing requirements of the boss size (the machining tolerance of the size ≤ 0.05 mm).

[0003] Since the length of this type of repaired blade is about 300 mm, the maximum blade wall thickness near the boss to be machined is only about 0.2 mm, and the material restored by welding at the boss is cemented carbide. Therefore, during the grinding process of the boss, the rigidity of the blade is poor, and it is easy to cause clamping deformation or over-positioning due to excessive manual tightening force when clamping the blade body, resulting in grinding out-of-tolerance; or due to insufficient tightening force, the blade is not fixed, resulting in grinding chatter, and the machining accuracy of the boss size cannot be guaranteed.

[0004] In addition, the existing fixed tooling is designed according to the standard blade drawings. During the actual repair process, the low-pressure rotor blades with bosses have all deformed to varying degrees due to service, and the matching degree with the tooling is not high, and the reference positioning is inaccurate. Workers need to perform multiple grinding, measurement, and adjustment operations to machine to the qualified size, which seriously affects the product assembly cycle.

[0005] In summary, there is an urgent need for an adaptive flexible clamping device applicable to grinding of bosses of deformed thin-walled curved surface blades to solve the problem of poor grinding accuracy caused by blade deformation, clamping and positioning, and chatter. Summary of the Invention

[0006] The purpose of the present application is to provide an adaptive flexible clamping device applicable to grinding of bosses of deformed thin-walled curved surface blades to solve the problem that there is an urgent need for an adaptive flexible clamping device applicable to grinding of bosses of deformed thin-walled curved surface blades in the prior art to solve the problem of poor grinding accuracy caused by blade deformation, clamping and positioning, and chatter.

[0007] To achieve the above purpose, an embodiment of the present application provides an adaptive flexible clamping device applicable to grinding of bosses of deformed thin-walled curved surface blades, including: a tailstock, a first tightening member, and a blade body auxiliary support mechanism, wherein,

[0008] A mortise groove is provided on the left end face of the tailstock, and one end of the mortise groove extends to the side of the tailstock, and the mortise groove is coupled with the tenon of the blade;

[0009] The first tightening member is arranged on the tailstock, and the first piston rod arranged in the first tightening member is located on the right side of the mortise groove and extends towards the mortise groove;

[0010] The auxiliary support mechanism for the blade body includes a first baffle and a second baffle which are oppositely arranged. The right ends of the first baffle and the second baffle are both connected to the tailstock. Second tightening components are arranged on both the first baffle and the second baffle. The second piston rods of the oppositely arranged second tightening components extend towards each other.

[0011] Optionally, a first accommodation hole penetrating through the tailstock is formed on the right side surface of the mortise groove, and the first accommodation hole extends rightwards to the right end face of the tailstock;

[0012] The first piston rod of the first tightening component is arranged in the first accommodation hole.

[0013] Optionally, second accommodation holes penetrating through from front to back are formed on both the first baffle and the second baffle, and the second piston rod is arranged in the second accommodation hole.

[0014] Optionally, a plurality of the second tightening components are oppositely arranged on the first baffle and the second baffle.

[0015] Optionally, a mortise groove positioning protrusion is provided at the other end of the mortise groove for abutting against the end face of one end of the blade tenon head sliding into the mortise groove to limit the sliding direction of the tenon head.

[0016] Optionally, a connecting plate is respectively connected to the left ends of the first baffle and the second baffle.

[0017] Optionally, a first notch is formed on one side of the mortise groove on the tailstock;

[0018] A second notch is formed on one side of the first baffle close to the first notch.

[0019] Optionally, the first tightening component or the second tightening component is a hydraulic cylinder or a pneumatic cylinder.

[0020] The embodiment of the present application has the following advantages:

[0021] Compared with the prior art, the device provided by the above technical solution is provided with a mortise groove for cooperating with the blade tenon head, a first tightening component for tightening the tenon head, and a second tightening component for clamping the blade body. Among them, the second tightening component can adaptively clamp according to the shape of the blade body, can realize rapid clamping, and can avoid the problem of poor clamping consistency of the blade caused by human clamping error, or the deformation of the thin-walled curved surface caused by excessive auxiliary support force, thereby affecting the machining accuracy of the boss. Description of the Drawings

[0022] To more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only exemplary. For those of ordinary skill in the art, without creative efforts, other implementation drawings can also be obtained based on the provided drawings.

[0023] Figure 1 Schematic three-dimensional structure diagram of an adaptive flexible clamping device suitable for grinding the boss of a deformed thin-walled curved blade provided by at least one embodiment of the present application;

[0024] Figure 2 Partial cross-sectional view projected from the front of an adaptive flexible clamping device suitable for grinding the boss of a deformed thin-walled curved blade provided by at least one embodiment of the present application;

[0025] Figure 3 Logic block diagram of an adaptive flexible clamping method suitable for grinding the boss of a deformed thin-walled curved blade provided by at least one embodiment of the present application;

[0026] Figure 4 Schematic diagram of the structure of a deformed thin-walled curved blade of an adaptive flexible clamping method suitable for grinding the boss of a deformed thin-walled curved blade provided by at least one embodiment of the present application;

[0027] Figure 5 For Figure 4 Partial enlarged view of the projection of the boss from left to right in

[0028] Meanings of the marks in the drawings:

[0029] 1, blade body; 2, tenon; 3, boss; 4, long side of the boss machining surface; 5, first baffle; 6, tailstock; 7, first tightening member; 8, second tightening member; 9, second baffle; 10, first piston rod; 11, second piston rod; 12, connecting plate; 13, first notch; 14, second notch; 15, pin. Specific embodiments

[0030] The following specific embodiments illustrate the embodiments of the present application. Those familiar with this technology can easily understand other advantages and effects of the present application from the content disclosed in this specification. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of them. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0031] In the description of the present application, it should be noted that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Unless otherwise clearly specified and defined, the terms "set", "installed", "connected", "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0032] In addition, the technical features involved in different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0033] An embodiment of the present application provides an adaptive flexible clamping device applicable to the grinding of the boss of a deformed thin-walled curved blade. Refer to Figure 1 and Figure 2 , including:

[0034] A tailstock 6, a first tightening member 7, and a blade body auxiliary support mechanism. Among them,

[0035] A mortise groove is provided on the left end face of the tailstock 6, and one end of the mortise groove extends to the side of the tailstock 6, and the mortise groove is coupled with the tenon 2 of the blade.

[0036] The first tightening member 7 is arranged on the tailstock 6, and the first piston rod 10 arranged in the first tightening member 7 is located on the right side of the mortise groove and extends towards the mortise groove.

[0037] The blade body auxiliary support mechanism includes a first baffle 5 and a second baffle 9 arranged oppositely. The right ends of the first baffle 5 and the second baffle 9 are both connected to the tailstock 6, and second tightening members 8 are arranged on both the first baffle 5 and the second baffle 9. The second piston rods 11 of the relatively arranged second tightening members 8 extend towards each other.

[0038] Specifically, the mortise groove formed on the left end face of the tailstock 6 extends inward from the side edge on one side of the tailstock 6. The opening at one end of the mortise groove is located at the side edge on this side. The mortise groove has the same shape as the blade tenon 2, enabling the tenon 2 to slide into the mortise groove from the opening at one end of the mortise groove and fixing the tenon 2. The first piston rod 10 can telescopically move from the right side towards the mortise groove and can extend out of the right side wall of the mortise groove, so as to tightly press the tenon 2 in the mortise groove from this side towards the left (i.e., Figure 1 the X direction in

[0039] This embodiment of the present application also provides an adaptive flexible clamping method for grinding the boss of a deformed thin-walled curved surface blade, which adopts the adaptive flexible clamping device provided in the foregoing embodiment. Referring to Figure 3 , it includes:

[0040] Sliding the tenon 2 of the blade into the tailstock 6 from one end of the mortise groove;

[0041] Starting the first clamping component 7, and using the first piston rod 10 to tightly press from the right end face of the tenon 2 to tightly press and fix the blade towards the left side;

[0042] Starting the second clamping component 8, and using the relatively arranged second piston rods 11 to tightly press the blade body 1 of the blade;

[0043] Connecting the adaptive flexible clamping device to the machine tool through the provided zero-point positioning system.

[0044] In some embodiments, the zero-point positioning system includes a chuck and a pull stud, and the chuck and the pull stud are respectively arranged on the adaptive flexible clamping device and the machine tool.

[0045] Specifically, through the cooperation between the chuck and the pull stud of the zero-point positioning system, rapid replacement and precise positioning of the adaptive flexible clamping device are achieved. The chuck and the pull stud can be respectively arranged at the corresponding positions of the adaptive flexible clamping device and the machine tool. When it is necessary to grind the blade with the boss 3, the adaptive flexible clamping device is fixed on the machine tool through the cooperation between the chuck and the pull stud.

[0046] In some embodiments, the first clamping component 7 or the second clamping component 8 is a hydraulic cylinder or a pneumatic cylinder.

[0047] Specifically, after the tenon 2 of the blade slides from the opening at one end of the tenon groove into the tenon groove of the tailstock 6, the first tightening component 7 and the second tightening component 8 are activated, and the blade is tightened and fixed by the first piston rod 10 and the second piston rod 11. Since the left end of the tenon 2 is narrower than the right end and a slope is provided on the left side, after the first piston rod 10 applies a leftward force to the tenon 2, the slope on the left side of the tenon 2 abuts against the side of the tenon groove, thereby fixing the tenon 2 in the tenon groove.

[0048] Specifically, the pressure value of each second pressing component 8 is preset to 5N based on experimental experience data, which can ensure that the blade clamping deformation does not occur when the symmetrically arranged second piston rods 11 are pressed, and meet the clamping force requirements during blade grinding.

[0049] In some embodiments, since the blade body 1 is a deformed thin-walled curved surface, the second tightening component 8 has force feedback so as to better achieve adaptive flexible clamping of the deformed thin-walled curved surface blade body 1 .

[0050] Specifically, the force feedback mechanism includes: monitoring the motion state or the force received by the second piston rod 11 in real time through a pressure sensor, a displacement sensor or a force sensor, etc., and the signal collected by the sensor is processed and converted into a recognizable force feedback signal, which specifically includes steps such as signal amplification, filtering and analog-to-digital conversion. The processed feedback signal can be output to the control system through an electrical interface (such as analog signal output, digital signal output, etc.) or a mechanical interface (such as a lever, a connecting rod, etc.), and the control system controls the start and stop of the second tightening component 8 based on the preset pressure value of each second tightening component 8.

[0051] In some embodiments, after the blade body 1 and the tenon 2 are tightened, in order to ensure that there is no abnormality in the blade clamping, the following steps are also included:

[0052] The machine tool's built-in contact probe is used to collect data of the three points of the boss 3 on four pairs of blades along the long side of the boss processing surface (reference Figure 4 and Figure 5 ), calculate the data deviation, if the deviation meets the preset requirements (for example, the deviation range ≤ 0.01mm), the clamping is determined to be qualified and the grinding work is started. If the deviation does not meet the preset requirements, the second piston rod 11 and the first piston rod 10 are released, the blade is removed and the adaptive flexible clamping method is re-executed.

[0053] In some embodiments, a first receiving hole penetrating the tailstock 6 is opened on the right side surface of the mortise and tenon groove, and the first receiving hole extends rightward to the right end surface of the tailstock 6;

[0054] The first piston rod 10 of the first pressing member 7 is arranged in the first receiving hole;

[0055] After starting the first pressing member, the first piston rod extends from right to left in the first receiving hole, so that the first piston rod abuts against the right end face of the blade tenon to press and fix the blade to the left side.

[0056] Specifically, the cylinder block of the first pressing member 7 is installed on the right side of the tailstock 6. The first piston rod 10 extends from the right side of the tailstock 6 to the left. The first piston rod 10 can pass through the tailstock 6 from the first receiving hole and extend into the mortise groove from the side wall on the right side of the mortise groove, so as to press the tenon 2 in the mortise groove to the left.

[0057] In some embodiments, both the first baffle 5 and the second baffle 9 are provided with second receiving holes penetrating through the front and back, and the second piston rod 11 is arranged in the second receiving hole;

[0058] After starting the second pressing member, the second piston rods on the front and rear sides extend towards each other in the second receiving hole, so that the second piston rods on the front and rear sides respectively abut against the front and rear side faces of the blade body to press and fix the blade body.

[0059] In some embodiments, a plurality of the second pressing members 8 are oppositely arranged on the first baffle 5 and the second baffle 9;

[0060] After starting the second pressing member, a plurality of the second pressing members arranged oppositely press and fix different positions of the blade body.

[0061] Specifically, the cylinder block of the second pressing member 8 is arranged on one side of the first baffle 5 and the second baffle 9 away from each other. The second piston rods 11 of the two second pressing members 8 on both sides respectively pass through the second receiving holes provided on the first baffle 5 and the second baffle 9 and extend towards each other. After the second piston rods 11 of the multiple pairs of symmetrically arranged second pressing members 8 on both sides extend towards each other, due to the symmetric arrangement, they can abut against each other in pairs. By arranging multiple pairs of the second pressing members 8, better adaptive flexible clamping of the deformed thin-walled curved surface blade body 1 can be achieved.

[0062] In some embodiments, it further includes:

[0063] A mortise groove positioning protrusion, which is arranged at the other end of the mortise groove and is used to abut against the end face of one end of the blade tenon 2 sliding into the mortise groove to limit the sliding direction of the tenon 2;

[0064] After the tenon of the blade slides into the tailstock from one end of the mortise groove, the end face of the end of the tenon sliding into the mortise groove abuts against the mortise groove positioning protrusion to limit the tenon.

[0065] Specifically, the mortise groove positioning protrusion can be arranged at the other end of the mortise groove far from the opening, protruding from the right side face of the mortise groove. In some embodiments, refer to Figure 1, the tenon groove positioning protrusion can also be a pin 15 inserted from the right side of the tailstock 6. After the pin 15 is inserted, its left end extends into the tenon groove to block the end of the tenon 2 that slides into the tenon groove, playing a role in limiting the sliding direction of the tenon 2.

[0066] In some embodiments, it further includes:

[0067] A connecting plate 12, which is respectively connected to the left ends of the first baffle 5 and the second baffle 9.

[0068] Specifically, the connecting plate 12 is used to fix the left ends of the first baffle 5 and the second baffle 9.

[0069] In some embodiments, on one side of the tenon groove on the tailstock 6, a first notch 13 is provided;

[0070] On one side of the first baffle 5 close to the first notch 13, a second notch 14 is provided;

[0071] When the tenon of the blade is slid into the tailstock from one end of the tenon groove, the tenon of the blade is slid into the tenon groove from the position of the first notch, and the blade body of the blade is fed between the first baffle and the second baffle from the position of the second notch.

[0072] Specifically, a first notch 13 is provided on the side of the tailstock 6 at the open end of the tenon groove, and a second notch 14 is provided on one side of the first baffle 5 close to the first notch 13. The first notch 13 and the second notch 14 together form a complete notch, which can enable the blade to smoothly slide into the tenon groove and between the first baffle 5 and the second baffle 9 from the notch side without being blocked.

[0073] In summary, compared with the prior art, the adaptive flexible clamping device for convex grinding of deformed thin-walled curved surface blades provided by the embodiment of the present application, in cooperation with the zero-point positioning system, realizes quick tool change and uses the built-in contact probe in the machine tool to confirm the blade clamping state. The provided clamping method can achieve quick clamping and avoid the problems of poor blade clamping consistency caused by human clamping errors or deformation of the thin-walled curved surface caused by excessive auxiliary support force, thus affecting the machining accuracy of the convex platform. Through experiments, the repeat positioning accuracy of this clamping method is ≤0.01 mm, the blade deformation is ≤0.01 mm, and the one-time qualified rate of grinding can reach 100%. This method is equipped with a zero-point positioning system, which can reduce the machine tool repositioning time during tool change and improve the grinding efficiency. The contact probe collects convex platform data and feedback deviations along the long side of the convex platform machining surface to confirm the state of the blade before clamping and grinding, which can ensure that there will be no over-grinding problem caused by accidental blade deflection during pneumatic or hydraulic clamping.

[0074] Note that, unless otherwise directly stated, all features disclosed in this specification (including any appended claims, abstract, and drawings) may be replaced by alternative features that serve the same, equivalent, or similar purposes. Thus, unless otherwise explicitly stated, each feature disclosed is only an example of a group of equivalent or similar features. Where used, further, preferably, furthermore, and more preferably are simple introductions for elaborating another embodiment based on the foregoing embodiment, and the content following the further, preferably, furthermore, or more preferably, in combination with the foregoing embodiment, constitutes the complete composition of another embodiment. Among several further, preferably, furthermore, or more preferably settings following the same embodiment, any combination thereof may form yet another embodiment.

[0075] In the implementation of functions and steps, the corresponding functions and steps in each embodiment may also occur in an order different from that shown. For example, two consecutive functions and steps may actually be executed or implemented substantially in parallel, and they may sometimes be executed or implemented in the reverse order, depending on the functions involved.

[0076] Although the present application has been described in detail above with general descriptions and specific embodiments, modifications or improvements can be made to it on the basis of the present application, which are obvious to those skilled in the art. Therefore, these modifications or improvements made without departing from the spirit of the present application fall within the scope of protection required by the present application.

Claims

1. An adaptive flexible clamping device applicable to the grinding of bosses on deformed thin-walled curved blades, characterized in that, Comprising: A tailstock, a first tightening component, and a blade body auxiliary support mechanism. Among them, A mortise groove is provided on the left end face of the tailstock, and one end of the mortise groove extends to the side of the tailstock, and the mortise groove is coupled with the tenon of the blade; The first tightening component is arranged on the tailstock, and the first piston rod arranged in the first tightening component is located on the right side of the mortise groove and extends towards the mortise groove; The blade body auxiliary support mechanism includes a first baffle and a second baffle arranged oppositely. The right ends of the first baffle and the second baffle are both connected to the tailstock, and second tightening components are arranged on both the first baffle and the second baffle. The second piston rods of the relatively arranged second tightening components extend towards each other.

2. The adaptive flexible clamping device applicable to the grinding of the boss of a deformed thin-walled curved surface blade according to claim 1, characterized in that, A first accommodation hole penetrating the tailstock is provided on the right side surface of the mortise groove, and the first accommodation hole extends to the right end face of the tailstock; The first piston rod of the first tightening component is arranged in the first accommodation hole.

3. The adaptive flexible clamping device applicable to the grinding of the boss of a deformed thin-walled curved surface blade according to claim 1, characterized in that, Both the first baffle and the second baffle are provided with second accommodation holes penetrating through the front and back, and the second piston rod is arranged in the second accommodation hole.

4. The adaptive flexible clamping device applicable to the grinding of the boss of a deformed thin-walled curved surface blade according to claim 1, characterized in that, A plurality of the second tightening components are arranged oppositely on the first baffle and the second baffle.

5. The adaptive flexible clamping device applicable to the grinding of the boss of a deformed thin-walled curved blade according to claim 1, wherein Further comprising: A mortise groove positioning protrusion, which is arranged at the other end of the mortise groove and is used to abut against the end face of one end of the blade tenon sliding into the mortise groove to limit the sliding direction of the tenon.

6. The adaptive flexible clamping device applicable to the grinding of the boss of a deformed thin-walled curved blade according to claim 1, wherein, Further comprising: A connecting plate, which is respectively connected to the left ends of the first baffle and the second baffle.

7. The adaptive flexible clamping device applicable to the grinding of the boss of a deformed thin-walled curved surface blade according to claim 1, characterized in that, A first notch is provided on the side of the tailstock where the mortise groove is provided; A second notch is provided on the side of the first baffle close to the first notch.

8. The adaptive flexible clamping device applicable to the grinding of the boss of a deformed thin-walled curved surface blade according to claim 1, characterized in that, The first tightening component or the second tightening component is a hydraulic cylinder or an air cylinder.

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