Overturning clamp for turning special-shaped workpiece

Abstract

The turning clamp for turning the special-shaped workpiece comprises a bottom plate and a turning block, at least two positioning columns are installed on the surface of the bottom plate, and the connecting line of the centers of the two positioning columns coincides with the center of the bottom plate; the overturning block is of a U-shaped block structure with three open faces. The turning device is simple and reasonable in design structure, a workpiece is placed in the inner cavity of the turning block, the workpiece is positioned through the reference platform, the positioning protrusion and the positioning plate, then the workpiece is fixed to the turning block through the locking bolt, the turning block is installed on the bottom plate through the positioning column, and the turning block is fixed to the bottom plate through the positioning column. The effect that the axis of a to-be-machined through hole of a workpiece coincides with the center line of the bottom plate is achieved, after the through hole in one side is machined, the overturning block is overturned, the overturning block is still positioned through the positioning column, the through hole in the other side is machined, and therefore the requirement that the axes of the two through holes coincide with each other is met. The device has the advantages of high repeated positioning precision, convenience in operation and high working efficiency.

Description

Technical Field

[0001] This utility model belongs to the technical field of drilling tooling fixtures and relates to a flipping fixture for turning irregularly shaped workpieces. Background Technology

[0002] In the field of machining, lathes are important equipment widely used for machining rotating parts. However, when machining irregularly shaped workpieces with high coaxiality requirements (such as complex structural parts with through holes at both ends), the machining methods of traditional lathes have obvious limitations.

[0003] Currently, a common processing method is to first machine a through hole at one end of the workpiece, then flip the workpiece, re-clamp it, and machine a through hole at the other end. However, due to the difficulty in ensuring a precise positioning datum during the secondary clamping process, and the influence of factors such as clamping force and machine tool errors, the coaxiality of the through holes at both ends often fails to meet high-precision requirements. For example... Figure 5 As shown, the irregularly shaped workpiece has an L-shaped structure, with a hollowed-out section at the corner. During manufacturing, a through hole penetrating the thickness direction needs to be machined at the corner of the L-shape. If a single through-hole drilling method is used, the drill bit lacks stable support and guidance when machining the other through hole after passing through one side, easily causing radial runout due to cutting forces, resulting in misalignment of the two hole axes. Existing technologies using workpiece flipping also suffer from insufficient coaxiality of the two holes to meet machining accuracy requirements. Therefore, a flipping fixture for turning irregularly shaped workpieces is urgently needed to solve these problems. Utility Model Content

[0004] The purpose of this utility model is to provide a flipping fixture for turning irregular workpieces, so as to solve the problem mentioned in the background art that the existing irregular workpieces cannot meet the coaxiality requirements of through holes when drilling.

[0005] The technical solution of this utility model is implemented as follows:

[0006] A flipping fixture for turning irregularly shaped workpieces includes a base plate and a flipping block. At least two positioning posts are mounted on the surface of the base plate, and the line connecting the centers of the two positioning posts coincides with the center of the base plate.

[0007] The flipping block is a U-shaped block structure with three open sides, allowing the workpiece to be placed inside the flipping block. A locking bolt is installed on one side of the flipping block, and the workpiece can be fixed inside the flipping block by tightening the locking bolt.

[0008] The flipping block has guide holes in its thickness direction that match the positions of the positioning pins, and the positioning pins can be inserted into the interior positions of the guide holes from both ends.

[0009] It also includes a reference platform and a positioning protrusion for positioning the workpiece. The outer planes of the reference platform and the positioning protrusion are set perpendicular to each other. After the workpiece contacts the reference platform and the positioning protrusion, the axis of the through hole to be processed on the workpiece can be kept coincident with the center line of the base plate.

[0010] Preferably, the reference platform protrudes from the first sidewall of the flipping block toward the center, and the positioning protrusion is located at the root of the U-shaped structure of the flipping block.

[0011] Preferably, the second sidewall of the flipping block has a positioning plate extending in the central direction.

[0012] Preferably, the locking bolt is threaded onto the flipping block, the locking bolt passes through the second sidewall of the flipping block and has a pressure block at its end.

[0013] Preferably, the first sidewall of the flipping block on both sides of the reference platform has a limiting block extending towards the center. The surface of the limiting block is higher than the upper surface of the reference platform, and the distance between the two limiting blocks is consistent with the width of the workpiece.

[0014] Preferably, it also includes a pressure plate mounted on the base plate for fixing the flipping block.

[0015] Preferably, a T-shaped groove is provided on the base plate, a T-shaped block is slidably connected in the T-shaped groove, a screw is threadedly connected to the T-shaped block, and a support column is provided near the edge of the base plate, the center of the support column coincides with the line connecting the centers of the two positioning columns.

[0016] By adopting the above technical solution, the beneficial effects of this utility model are as follows:

[0017] This utility model has a simple and reasonable design structure. By placing the workpiece in the inner cavity of the flipping block and positioning it through the reference platform, positioning protrusion, and positioning plate, the workpiece is then fixed on the flipping block using locking bolts. The flipping block is then mounted on the base plate through positioning pins, achieving the effect that the axis of the through hole to be processed on the workpiece coincides with the center line of the base plate. After processing one side of the through hole, the flipping block is flipped and positioned again through the positioning pins to process the through hole on the other side, thus maintaining the requirement that the axes of the two through holes coincide. It has the advantages of high repeatability, convenient operation, and high work efficiency. Attached Figure Description

[0018] 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 these drawings without creative effort.

[0019] Figure 1 This is a perspective view of the present utility model;

[0020] Figure 2 This is an exploded view of the present invention;

[0021] Figure 3 This is a schematic diagram of the usage state of this utility model. Figure 1 ;

[0022] Figure 4 This is a schematic diagram of the usage state of this utility model. Figure 2 ;

[0023] Figure 5 This is a 3D view of an irregularly shaped workpiece to be processed.

[0024] in:

[0025] 1. Base plate; 2. Positioning post; 3. Flipping block; 301. First side wall; 302. Second side wall; 4. Locking bolt; 5. Positioning plate; 6. Positioning protrusion; 7. Pressure block; 8. Limiting block; 9. Guide hole; 10. Reference platform; 11. T-slot; 12. Pressure plate; 13. Screw; 14. Support post; 15. First positioning surface; 16. Second positioning surface; 17. Positioning bottom surface; 18. Through hole. Detailed Implementation

[0026] 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.

[0027] As shown in the figure, a flipping fixture for turning irregularly shaped workpieces includes a base plate 1 and a flipping block 3. At least two positioning posts 2 are mounted on the surface of the base plate 1, and the line connecting the centers of the two positioning posts 2 coincides with the center of the base plate 1. In this example, the base plate 1 has a disc-shaped structure and can be mounted on the lathe chuck, so that the center line of the base plate 1 coincides with the rotation center of the lathe chuck. In other embodiments, the base plate 1 can also be designed as a circular disc structure. The number of positioning posts 2 is set to two, which can achieve a precise positioning effect on the flipping block 3.

[0028] The flipping block 3 is a U-shaped block structure with three open sides. The workpiece can be placed in the inner cavity of the flipping block 3. A locking bolt 4 is installed on one side of the flipping block 3. By tightening the locking bolt 4, the workpiece can be fixed in the flipping block 3. The workpiece is fixed by the locking bolt 4, so that the workpiece, the flipping block 3, and the locking bolt 4 form an integral structure. When flipping, the integral structure can be flipped at the same time to avoid repeated clamping of the workpiece.

[0029] The flipping block 3 has guide holes 9 in the thickness direction that match the position of the positioning post 2. The positioning post 2 can be inserted into the interior position of the guide hole 9 from both ends. The positioning post 2 and the guide hole 9 cooperate to enable the flipping block 3 to achieve precise positioning quickly. The two ends of the guide hole 9 are set as tapered flared structures to facilitate the smooth insertion of the positioning post 2 into the guide hole 9.

[0030] It also includes a reference platform 10 and a positioning protrusion 6 for positioning the workpiece. The outer planes of the reference platform 10 and the positioning protrusion 6 are set perpendicular to each other. After the workpiece contacts the reference platform 10 and the positioning protrusion 6, the axis of the through hole 18 to be processed on the workpiece can be kept coincident with the center line of the base plate 1.

[0031] In this example, the reference platform 10 protrudes from the first sidewall 301 of the flipping block 3 towards the center, and the positioning protrusion 6 is located at the root of the U-shaped structure of the flipping block 3. It can be understood that in other embodiments, the reference platform 10 has a plate-like structure and is connected to the flipping block 3 with screws. The reference platform 10 is mainly used to ensure that the positioning bottom surface 17 of the workpiece fits against the reference platform 10, serving as one of the positioning references for the workpiece.

[0032] Specifically, the second side wall 302 of the flipping block 3 has a positioning plate 5 extending towards the center. Since the workpiece has an L-shaped structure, the positioning plate 5 can contact the first positioning surface 15 of the workpiece, thereby achieving the purpose of reliable workpiece positioning.

[0033] Specifically, the locking bolt 4 is threaded onto the flip block 3. The locking bolt 4 passes through the second side wall 302 of the flip block 3 and is connected to a pressure block 7 at its end. The pressure block 7 and the locking bolt 4 are rotatably fitted. During the tightening of the locking bolt 4, the pressure block 7 is in contact with the workpiece and will not rotate, so that the pressure block 7 is pressed only on the workpiece.

[0034] Specifically, the first sidewall 301 of the flipping block 3 on both sides of the reference platform 10 has a limiting block 8 extending towards the center. The surface of the limiting block 8 is higher than the upper plane of the reference platform 10, and the distance between the two limiting blocks 8 is consistent with the width of the workpiece. With this setting, the width direction of the workpiece can be limited by the limiting blocks 8. In this example, when the workpiece is installed between the two limiting blocks 8, the distance between the two sides of the workpiece and the outer wall of the flipping block 3 is equal, which can better improve the accuracy of the through hole 18 during machining.

[0035] Specifically, it also includes a pressure plate 12 installed on the base plate 1 for fixing the flipping block 3. More specifically, a T-slot 11 is provided on the base plate 1, and a T-block is slidably connected in the T-slot 11. A screw 13 is threadedly connected to the T-block. A support column 14 is provided near the edge of the base plate 1. The center of the support column 14 coincides with the line connecting the centers of the two positioning columns 2. When pressing, the end of the pressure plate 12 can always abut against the end of the support column 14 to realize the rapid pressing of the flipping block 3 before and after flipping.

[0036] When using this type of turning fixture for irregularly shaped workpieces, firstly, the base plate 1 is installed on the lathe fixture, with the center of the base plate 1 coinciding with the center of the lathe fixture. Then, the workpiece is inserted into the turning block 3, ensuring that the workpiece's positioning bottom surface 17 is in contact with the reference platform 10, the second positioning surface 16 at the end of the workpiece contacts the positioning protrusion 6, and the first positioning surface 15 of the workpiece contacts the positioning plate 5. Locking bolts 4 are used to clamp the workpiece, achieving precise positioning and fastening. Next, the guide hole 9 of the turning block 3 is aligned with the positioning post 2 on the base plate 1, so that the positioning post 2 is inserted into the guide hole 9. At this point, the through hole 18 to be machined on the workpiece is aligned with the rotation center of the lathe fixture. After the turning block 3 is clamped by the pressure plate 12, the through hole 18 can be machined (e.g., ...). Figure 3 As shown), after the through hole 18 on one side is machined, the pressure plate 12 is released, the flipping block 3 is flipped, and then the flipping block 3 is pressed tightly by the pressure plate 12 to machine the through hole 18 on the other side (as shown). Figure 4 (As shown).

[0037] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A reversed clamp for turning a profiled workpiece, characterized in that, Including the bottom plate (1) and the turnover block (3), the surface of the bottom plate (1) is provided with at least two positioning columns (2), and the center line of the two positioning columns (2) coincides with the center of the bottom plate (1); The turnover block (3) is a U-shaped block structure with three open sides, and the workpiece can be placed in the inner cavity of the turnover block (3). The turnover block (3) is provided with a locking bolt (4) on one side. By tightening the locking bolt (4), the workpiece can be fixed in the turnover block (3). The thickness direction of the turnover block (3) is provided with a guide hole (9) matched with the position of the positioning column (2). The positioning column (2) can be inserted into the inner position of the guide hole (9) from both ends of the guide hole (9). It also includes a reference platform (10) and a positioning protrusion (6) for positioning the workpiece. The reference platform (10) and the positioning protrusion (6) are arranged perpendicular to each other. After the workpiece contacts the reference platform (10) and the positioning protrusion (6), the axis of the workpiece to be machined can be kept coincident with the center line of the bottom plate (1).

2. A turnover fixture for turning of a profiled workpiece according to claim 1, characterized in that: The reference platform (10) is protrudingly arranged from the first side wall (301) of the turnover block (3) to the center direction. The positioning protrusion (6) is arranged at the root position of the U-shaped structure of the turnover block (3).

3. A turnover fixture for turning of a profiled workpiece according to claim 2, characterized in that: The second side wall (302) of the turnover block (3) has a positioning plate (5) extending to the center direction.

4. The inverted fixture for turning a profiled workpiece according to claim 1, characterized in that: The locking bolt (4) is threadedly connected to the turnover block (3). The locking bolt (4) penetrates the second side wall (302) of the turnover block (3) and is connected with a pressing block (7) at the end.

5. A turnover fixture for turning of a profiled workpiece according to claim 2, characterized in that: The first side wall (301) of the turnover block (3) on both sides of the reference platform (10) has a limiting block (8) extending to the center direction. The surface of the limiting block (8) is higher than the upper surface of the reference platform (10), and the spacing between the two limiting blocks (8) is consistent with the width of the workpiece.

6. A turnover fixture for turning of a profiled workpiece according to claim 1, characterized in that: It also includes a pressing plate (12) mounted on the bottom plate (1) and used for fixing the turnover block (3).

7. A turnover fixture for turning of a profiled workpiece according to claim 6, characterized in that: A T-shaped groove (11) is formed in the bottom plate (1). A T-shaped block is slidably connected in the T-shaped groove (11). A screw rod (13) is threadedly connected to the T-shaped block. A support column (14) is arranged at the edge of the bottom plate (1). The center of the support column (14) coincides with the center line of the two positioning columns (2).

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