A funnel-shaped titanium alloy casting clamping tool

Abstract

The utility model relates to machining fixture technical field, especially a kind of clamping tool of funnel-shaped titanium alloy casting, including adapter plate, movable push block and drive bolt;Positioning hole is opened in adapter plate, the positioning hole is used to insert titanium alloy casting funnel body;First positioning cambered surface is provided on the side wall of positioning hole, for the outer peripheral surface contact cooperation of first arc-shaped side wall on funnel body;Adapter plate is provided with sliding slot, and sliding slot is located in the side of positioning hole;Movable push block is slidably installed in sliding slot;Drive bolt is transversely screwed on the side wall of one side of sliding slot;And drive bolt is connected with movable push block;Second positioning cambered surface is provided on movable push block, and second positioning cambered surface is oppositely arranged with first positioning cambered surface, and second positioning cambered surface is used for the outer peripheral surface contact cooperation of second arc-shaped side wall on funnel body.The accurate centering clamping of casting is realized by positioning hole and double positioning cambered surface.

Description

Technical Field

[0001] This utility model relates to the field of machining fixture technology, and in particular to a clamping fixture for a funnel-shaped titanium alloy casting. Background Technology

[0002] Titanium alloy castings are widely used in aerospace and other fields due to their excellent mechanical properties and corrosion resistance. For example... Figure 1 As shown, a typical funnel-shaped titanium alloy casting employs an inverted funnel structure, integrally formed from a lower funnel body 100 and a top cylinder 101. The cylinder 101 has a central through-hole communicating with the inner cavity of the funnel body 100; its standard outer diameter is φ36mm, while the wall thickness of the funnel body 100 is only 2.5mm. A 5.5mm thick mounting edge is provided on the outer circumferential surface of the lower end of the funnel body 100. The special structure of this casting is reflected in the asymmetrical first arc-shaped sidewall 100a and second arc-shaped sidewall 100b of the funnel body 100, both with unequal outer diameters but whose axes are parallel to the axis of the cylinder 101.

[0003] After casting, the outer circle of cylinder 101 and the stepped outer circle of its connection with funnel body 100 need to be precision machined. However, due to the high strength of titanium alloy material, coupled with the thin wall thickness and asymmetrical structure of the casting itself, there are obvious defects when using a traditional three-jaw chuck for clamping: on the one hand, the clamping force of the chuck is difficult to distribute evenly, which can easily lead to deformation of the thin-walled parts; on the other hand, the asymmetrical structure makes the casting prone to deflection during clamping, making it impossible to guarantee the coaxiality requirement between the axis of cylinder 101 and the lathe spindle.

[0004] Therefore, it is not possible to directly clamp titanium alloy castings using a three-jaw chuck on a lathe. There is an urgent need for a clamping fixture for funnel-shaped titanium alloy castings. Utility Model Content

[0005] The main objective of this invention is to provide a clamping fixture for funnel-shaped titanium alloy castings, aiming to solve the aforementioned technical problems.

[0006] To achieve the above objectives, this utility model proposes a clamping fixture for a funnel-shaped titanium alloy casting, comprising an adapter plate, a movable push block, and a driving bolt. A positioning hole is provided on the adapter plate for inserting the funnel body of the titanium alloy casting. A first positioning arc surface is provided on the side wall of the positioning hole for contact and engagement with the outer circumferential surface of the first arc-shaped side wall on the funnel body. A sliding groove is provided on the adapter plate, located on one side of the positioning hole. The movable push block is slidably installed in the sliding groove. The driving bolt is laterally screwed onto the side wall of one side of the sliding groove and is connected to the movable push block. A second positioning arc surface is provided on the movable push block, opposite to the first positioning arc surface, for contact and engagement with the outer circumferential surface of the second arc-shaped side wall on the funnel body.

[0007] Preferably, a recessed platform is provided on the bottom surface of the adapter plate, and the depth h of the recessed platform is greater than the thickness of the mounting edge of the titanium alloy casting.

[0008] Preferably, the bottom surface of the movable push block is flush with the top wall of the sinking platform.

[0009] Preferably, ear plates are provided at both ends of the movable push block; two pressure plates are embedded in the top wall of the sinking platform; the pressure plates and the adapter plate are fastened together by screws; the pressure plates press on the ear plates, and the two are slidably engaged.

[0010] Preferably, two positioning pins are provided between the pressure plate and the adapter plate.

[0011] Preferably, the movable push block is provided with a mounting hole; the drive bolt is rotatably installed in the mounting hole; an annular limiting groove is provided at the end of the drive bolt; a limiting screw is screwed onto the movable push block, and the limiting screw is stuck in the annular limiting groove.

[0012] Preferably, six clamping planes are evenly distributed on the outer peripheral surface of the adapter plate, and adjacent clamping planes are connected by a circular arc surface.

[0013] Preferably, when the outer peripheral surface of the first arc-shaped sidewall on the titanium alloy casting is in contact with the first positioning arc surface, the theoretical axis of the cylinder on the titanium alloy casting coincides with the central axis of the adapter plate.

[0014] Preferably, the height of the first positioning arc surface is greater than the height of the first arc-shaped sidewall on the funnel body.

[0015] Preferably, the depth h of the sinking platform satisfies: h ≥ 1.5t, where t is the thickness of the mounting edge of the titanium alloy casting.

[0016] Due to the adoption of the above technical solution, the beneficial effects of this utility model are as follows: In the clamping fixture provided by this utility model, the adapter plate is used to be installed on the three-jaw chuck of the lathe. When clamping the titanium alloy casting to be processed, the titanium alloy casting passes through the positioning hole on the adapter plate from bottom to top, and the funnel body on the casting is inserted into the positioning hole on the adapter plate. By rotating the drive bolt, the movable push block is driven to move, so that the second positioning arc surface of the movable push block is pressed against the second arc side wall of the funnel body. By further tightening the drive bolt, the first arc side wall on the funnel body is pressed against the first positioning arc surface of the positioning hole. The precise centering and clamping of the casting is achieved through the positioning hole and the double positioning arc surface. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 A cross-sectional view of a funnel-shaped titanium alloy casting; Figure 2 A schematic diagram of a titanium alloy casting being clamped in the clamping fixture provided in this utility model; Figure 3 for Figure 2 A view from direction A, and the titanium alloy casting is not shown in this view.

[0019] Explanation of reference numerals: 1. Adapter plate; 1a. Positioning hole; 1b. First positioning arc surface; 1c. Slide groove; 1d. Countersunk platform; 1e. Clamping plane; 1f. Arc surface; 2. Movable push block; 2a. Second positioning arc surface; 2b. Ear plate; 2c. Mounting hole; 3. Drive bolt; 3a. Annular limiting groove; 4. Pressure plate; 5. Screw; 6. Positioning pin; 7. Limiting set screw; 100. Funnel body; 100a. First arc-shaped side wall; 100b. Second arc-shaped side wall; 101. Cylinder; 103. Mounting edge. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0022] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0023] Combination Figure 2 and Figure 3 As shown, a clamping fixture for a funnel-shaped titanium alloy casting includes an adapter plate 1, a movable push block 2, and a drive bolt 3; the adapter plate 1 is used to be mounted on a three-jaw chuck of a lathe. A positioning hole 1a is provided on the adapter plate 1, which is used to insert the funnel body 100 of the titanium alloy casting. A first positioning arc surface 1b is provided on the side wall of the positioning hole 1a, which is used for contact and engagement with the outer peripheral surface of the first arc-shaped side wall 100a on the funnel body 100. A sliding groove 1c is provided on the adapter plate 1, which is located on one side of the positioning hole 1a. The movable push block 2 is slidably installed in the sliding groove 1c. The driving bolt 3 is laterally screwed onto the side wall of one side of the sliding groove 1c and is connected to the movable push block 2. A second positioning arc surface 2a is provided on the movable push block 2, which is opposite to the first positioning arc surface 1b and is used for contact and engagement with the outer peripheral surface of the second arc-shaped side wall 100b on the funnel body 100.

[0024] The radius of curvature of the first positioning arc surface 1b on the adapter plate 1 is consistent with the radius of the outer circumference of the first arc-shaped sidewall 100a on the casting, which is used to limit the radial displacement of the casting. The movable push block 2 is a clamping component that can move along the slide groove 1c. Specifically, it can adopt a rectangular slider structure, and the radius of curvature of its second positioning arc surface 2a matches the radius of the outer circumference of the second arc-shaped sidewall 100b on the casting. The drive bolt 3 is a driving element that adjusts the position of the movable push block 2. By rotating, it generates axial thrust, causing the movable push block 2 to move towards the casting and apply clamping force.

[0025] Specifically, after the funnel body 100 on the casting is inserted into the positioning hole 1a, the first arc-shaped sidewall 100a and the first positioning arc surface 1b are completely in contact. At this time, the rotating drive bolt 3 pushes the movable push block 2 to slide along the slide groove 1c. The second positioning arc surface 2a of the movable push block 2 gradually approaches and presses against the second arc-shaped sidewall 100b of the casting, forming a symmetrically distributed clamping force. Since the two positioning arc surfaces match the arc-shaped structures on both sides of the casting respectively, the position of the casting is automatically corrected during the clamping process to ensure that the axis of its cylinder 101 coincides with the central axis of the adapter plate 1. The drive bolt 3 keeps the position of the movable push block 2 stable through its self-locking characteristic, preventing loosening during processing.

[0026] Compared to existing technologies, traditional three-jaw chucks rely on evenly distributed jaws to clamp regular cylindrical surfaces. This solution, however, solves the problem of ineffective clamping of irregularly shaped castings through a combination of a customized positioning hole 1a and a movable push block 2. Automatic centering is achieved through two positioning arc surfaces; the complementary constraints of the first positioning arc surface 1b and the second positioning arc surface 2a effectively limit the radial displacement of the casting. Furthermore, traditional fixtures are prone to deformation when clamping thin-walled castings. This solution disperses clamping stress through surface contact, preventing localized deformation from affecting machining accuracy.

[0027] In this embodiment, a recessed platform 1d is provided on the bottom surface of the adapter plate 1, and the depth h of the recessed platform 1d is greater than the thickness of the mounting edge 103 of the titanium alloy casting. When the titanium alloy casting is inserted into the positioning hole 1a, the mounting edge 103 on the casting is embedded inside the recessed platform 1d, and the upper end face of the mounting edge 103 contacts the top wall of the recessed platform 1d, with the top wall of the recessed platform 1d serving as an axial limiting support surface.

[0028] Combination Figure 2 As shown, the bottom surface of the movable push block 2 is flush with the top wall of the sinking platform 1d. This feature ensures that the bottom of the movable push block 2 remains coplanar with the top wall of the sinking platform 1d during lateral movement. This flush design ensures that the movable push block 2 and the sinking platform 1d provide coordinated support during clamping, ensuring that the titanium alloy casting mounting edge 103 is completely contained within the sinking platform 1d. Furthermore, the bottom surface of the movable push block 2 and the top wall of the sinking platform 1d together provide axial positioning for the mounting edge 103.

[0029] Combination Figure 3 As shown, ear plates 2b are provided at both ends of the movable push block 2; two pressure plates 4 are embedded in the top wall of the recessed platform 1d; the pressure plates 4 and the adapter plate 1 are fastened together by screws 5; the pressure plates 4 press on the ear plates 2b, and the two slide together.

[0030] Ear plates 2b refer to plate-like structures located at both ends of the movable push block 2. Specifically, they can be implemented as metal bosses integrally formed with the movable push block 2, used to form a sliding contact surface with the pressure plate 4, restricting the vertical displacement of the movable push block 2. Pressure plate 4 refers to a plate-like component embedded in the top wall of the recessed platform 1d. Specifically, it can be implemented as a metal plate with a low coefficient of friction, fixed to the adapter plate 1 by screws 5, covering the lower surface of ear plates 2b, forming a sliding constraint on the movable push block 2.

[0031] By using the pressure plate 4, the problem of the movable push block 2 easily coming loose when sliding in the slide groove 1c is solved, ensuring that the movable push block 2 moves only in a predetermined direction during the clamping process, maintaining stable contact between the second positioning arc surface 2a and the second arc-shaped side wall 100b of the funnel body 100, and avoiding clamping failure caused by the offset of the movable push block 2.

[0032] Two locating pins 6 are provided between the pressure plate 4 and the adapter plate 1. Utilizing the rigid positioning characteristics of the locating pins 6, the relative position of the pressure plate 4 to the adapter plate 1 is predetermined before the pressure plate 4 is tightened by the screws 5. The two locating pins 6 form a two-point positioning constraint, eliminating the rotational freedom of the pressure plate 4 in the horizontal plane and preventing the pressure plate 4 from shifting due to uneven force during screw tightening. This structure ensures repeatable positioning accuracy in the assembly of the pressure plate 4 and the adapter plate 1, guarantees a stable sliding fit clearance between the ear plate 2b of the movable push block 2 and the pressure plate 4, thereby ensuring the accurate and reliable movement trajectory of the movable push block 2 in the slide groove 1c.

[0033] A mounting hole 2d is provided on the movable push block 2; the drive bolt 3 is rotatably installed in the mounting hole 2d; an annular limiting groove 3a is provided at the end of the drive bolt 3; a limiting screw 7 is screwed onto the movable push block 2, and the limiting screw 7 is engaged in the annular limiting groove 3a, but the limiting screw 7 does not tighten the drive bolt 3. The engagement between the annular limiting groove 3a and the limiting screw 7 allows the drive bolt 3 to rotate freely within the mounting hole 2d while effectively limiting the relative position of the movable slide block 2 and the drive bolt 3, preventing them from disengaging. The engagement between the annular limiting groove 3a and the limiting screw 7 forms an axial constraint. This synergistic design of rotational freedom and axial constraint allows the movable push block 2 to move synchronously when the drive bolt 3 is rotated.

[0034] Six clamping surfaces 1e are evenly distributed on the outer circumferential surface of the adapter plate 1, and adjacent clamping surfaces 1e are connected by an arc surface 1f. This technical solution provides multiple symmetrically distributed clamping contact points for the lathe chuck by setting six evenly distributed clamping surfaces 1e on the outer circumferential surface, thereby enhancing clamping stability. The three jaws on the three-jaw chuck can clamp on three spaced clamping surfaces 1e, so that the clamping force is evenly distributed in the circumferential direction, avoiding workpiece displacement caused by uneven distribution of clamping points.

[0035] In this embodiment, when the outer peripheral surface of the first arc-shaped sidewall 100a on the titanium alloy casting is in contact with the first positioning arc surface 1b, the theoretical axis of the cylinder 101 on the titanium alloy casting coincides with the central axis of the adapter plate 1. By defining the contact fit between the first positioning arc surface 1b and the first arc-shaped sidewall 100a on the casting, a spatial positioning reference is established between the adapter plate 1 and the titanium alloy casting. When the first arc-shaped sidewall 100a is fully in contact with the first positioning arc surface 1b, the radial position of the casting in the adapter plate 1 is forcibly constrained, so that the theoretical axis of the cylinder 101 is automatically aligned with the central axis of the adapter plate 1. This axis coincidence design eliminates the coaxiality error caused by inconsistent references in traditional clamping methods, providing a precise positioning reference for subsequent turning machining.

[0036] Combination Figure 2 As shown, the height of the first positioning arc surface 1b is greater than the height of the first arc-shaped sidewall 100a on the funnel body 100. This allows the first positioning arc surface 1b to completely cover and support the entire axial range of the first arc-shaped sidewall 100a. This design forms a continuous axially extending contact surface during clamping, effectively constraining the axial movement and radial sway of the casting during machining. When the turning tool acts on the outer circle of the cylinder 101, the increased height of the first positioning arc surface 1b can offset the deformation effect of the cutting force on the thin-walled funnel body 100, and at the same time, by increasing the contact area, it disperses the load and avoids local stress concentration that could lead to surface damage to the casting.

[0037] In this embodiment, the depth h of the countersink 1d satisfies: h ≥ 1.5t, where t is the thickness of the mounting edge 103 of the titanium alloy casting. By limiting the ratio between the depth of the countersink 1d and the thickness of the mounting edge 103, sufficient accommodating space is ensured for the countersink 1d. The technical feature of a countersink depth h ≥ 1.5t considers both the structural characteristics of the mounting edge 103 itself with a thickness t of 5.5mm and prevents the mounting edge 103 from contacting the three-jaw chuck during clamping by setting a safety factor of 1.5. By establishing a clear mathematical relationship between the depth of the countersink 1d and the thickness of the mounting edge 103, a precise match is achieved between the tooling design parameters and the casting structural parameters.

[0038] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the concept of the present utility model and using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A clamping fixture for a funnel-shaped titanium alloy casting, characterized in that, Includes adapter plate (1), movable push block (2) and drive bolt (3); A positioning hole (1a) is provided on the adapter plate (1), and the positioning hole (1a) is used to insert the funnel body (100) of the titanium alloy casting; a first positioning arc surface (1b) is provided on the side wall of the positioning hole (1a), which is used to contact and fit the outer peripheral surface of the first arc side wall (100a) on the funnel body (100). A slide groove (1c) is provided on the adapter plate (1), and the slide groove (1c) is located on one side of the positioning hole (1a); the movable push block (2) is slidably installed in the slide groove (1c); The drive bolt (3) is laterally screwed onto the side wall of the slide groove (1c); and the drive bolt (3) is connected to the movable push block (2); A second positioning arc surface (2a) is provided on the movable push block (2). The second positioning arc surface (2a) is positioned opposite to the first positioning arc surface (1b). The second positioning arc surface (2a) is used to contact and cooperate with the outer peripheral surface of the second arc-shaped sidewall (100b) on the funnel body (100).

2. The clamping fixture according to claim 1, characterized in that, A recessed platform (1d) is provided on the bottom surface of the adapter plate (1), and the depth h of the recessed platform (1d) is greater than the thickness of the mounting edge (103) of the titanium alloy casting.

3. The clamping fixture according to claim 2, characterized in that, The bottom surface of the movable push block (2) is flush with the top wall of the sinking platform (1d).

4. The clamping fixture according to claim 2, characterized in that, Ear plates (2b) are provided at both ends of the movable push block (2); two pressure plates (4) are embedded in the top wall of the sinking platform (1d); the pressure plates (4) are fastened to the adapter plate (1) by screws (5); The pressure plate (4) presses on the ear plate (2b), and the two slide together.

5. The clamping fixture according to claim 4, characterized in that, Two positioning pins (6) are provided between the pressure plate (4) and the adapter plate (1).

6. The clamping fixture according to claim 1, characterized in that, A mounting hole (2d) is provided on the movable push block (2); the drive bolt (3) is rotatably installed in the mounting hole (2d); An annular limiting groove (3a) is provided at the end of the driving bolt (3); a limiting screw (7) is screwed onto the movable push block (2), and the limiting screw (7) is stuck in the annular limiting groove (3a).

7. The clamping fixture according to claim 1, characterized in that, Six clamping planes (1e) are evenly distributed on the outer circumferential surface of the adapter plate (1), and two adjacent clamping planes (1e) are connected by a circular arc surface (1f).

8. The clamping fixture according to claim 1, characterized in that, When the outer peripheral surface of the first arc-shaped sidewall (100a) on the titanium alloy casting is in contact with the first positioning arc surface (1b), the theoretical axis of the cylinder (101) on the titanium alloy casting coincides with the central axis of the adapter plate (1).

9. The clamping fixture according to claim 1, characterized in that, The height of the first positioning arc surface (1b) is greater than the height of the first arc-shaped sidewall (100a) on the funnel body (100).

10. The clamping fixture according to claim 2, characterized in that, The depth h of the settling platform (1d) satisfies: h≥1.5t, where: t is the thickness of the mounting edge (103) of the titanium alloy casting.

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