A fixture for finishing a double-end casting

Abstract

The utility model belongs to foundry goods processing technical field especially, relate to a double -end casting finish machining clamp, in view of the problem of the present existing because of the casting blank error and the production change type leads to the reference deviation, present the following scheme, including clamping station, the top both sides fixed mounting of clamping station has the power frame, and the inside slide coupling of power frame has the resistance frame, and the front end fixed mounting of resistance frame has the resistance board. The device is rotatably connected with the rotating block through the fixed link, so that the clamping plate can be self-adapted to the casting shape, and the lower pull type zero clamp is matched. It can not only realize reliable clamping, but also quickly establish the positioning reference, greatly improve the change type efficiency of different shape castings, and at the same time, cooperate with the electromagnet and the permanent magnet plate, make the clamping plate accurately embedded in the clamping groove of the rotating block, significantly enhance the structural stability and clamping rigidity, greatly improve the positioning accuracy, avoid clamping failure caused by part loosening in processing from the root, effectively prevent the casting processing error.

Description

Technical Field

[0001] This utility model relates to a fixture for precision machining of castings, specifically a double-headed fixture for precision machining of castings, belonging to the field of casting processing technology. Background Technology

[0002] The EDNC10 CNC EDM machine is a high-performance machine tool specializing in precision electrical discharge machining. With its high-precision machining capabilities, stable operation, and high machining efficiency, it has become one of the preferred machines for high-precision dual-head casting machining. The EDNC10's precision electrical discharge technology can accurately match its machining standards, effectively avoiding damage to the surface of the casting during machining. In actual machining scenarios, the casting is precisely positioned and firmly clamped by special tooling fixtures to ensure that the casting does not shift during machining.

[0003] An existing patent (publication number: CN212706309U) discloses a fixing fixture for precision machining of castings. The beneficial technical effects of this utility model are as follows: the structure is simple and compact, easy to operate, maintain and install, and has strong stability; the casting is clamped by a fixed first baffle and a movable second baffle, both of which have a hard rubber layer on their surfaces, which can avoid squeezing damage to the surface of the casting during clamping; the fixing screws on the second baffle can realize secondary fixation of the casting, effectively preventing displacement during processing; at the same time, the pressure sensor configured on the first baffle can monitor the clamping pressure in real time, avoiding excessive pressure from adversely affecting the casting; however, in actual use, although the above clamping method can fix the casting, due to the differences in the shape and size of the casting and the influence of irregular structure, when clamping castings of different specifications, the operator needs to repeatedly adjust the device parameters, which is cumbersome and time-consuming; this problem results in a narrow range of applicability of the device, insufficient overall flexibility of use, and obvious limitations. Utility Model Content

[0004] This utility model provides a double-headed fixture for precision machining of castings to solve the problem of datum deviation caused by errors in casting blanks and production changes.

[0005] The present invention achieves the above objectives through the following technical solution: a jig for precision machining of double-headed castings, including a clamping table, a power frame fixedly installed on both sides of the top of the clamping table, and an abutment frame slidably connected inside the power frame, an abutment plate fixedly installed at the front end of the abutment frame, and a positioning mechanism provided on one side of the abutment plate;

[0006] The positioning mechanism includes a fixed rod, which is fixedly installed inside the contact plate, and one end of the fixed rod is rotatably connected to a rotating block. A clamping plate is fixedly installed on the outer wall of the rotating block, and a zero-point clamp is embedded in the outer wall of the clamping plate.

[0007] As a further embodiment of this utility model: an electromagnet is embedded in one side of the inside of the fixing rod, and a permanent magnet plate is slidably connected to the other side of the inside of the fixing rod. A locking plate is fixedly installed on one side of the permanent magnet plate, and a locking groove is formed on the axial outer wall of the rotating block.

[0008] As a further embodiment of this utility model: a sliding structure is formed between the contact plate and the clamping platform, and a sliding structure is formed between the power frame and the contact frame.

[0009] As a further improvement of this utility model: a reset spring is fixedly installed inside the fixing rod facing the permanent magnet plate, and a reinforcement mechanism is provided on one side of the clamping plate.

[0010] As a further embodiment of this utility model: the reinforcing mechanism includes a rotating plate, which is rotatably connected to one end of the clamping plate, and an mounting plate is fixedly installed on the outer wall of the rotating plate.

[0011] As a further embodiment of this utility model: an iron core extends through the inner wall of the mounting plate, and an electromagnetic coil is fixedly installed at one end of the iron core extending through the mounting plate, and a soft pouch is fixedly installed on the side of the mounting plate away from the electromagnetic coil.

[0012] As a further improvement of this utility model: a sleeve is fixedly installed on the outer wall of the mounting plate on one side of the soft bladder, and an abutment rod extends through the inside of the sleeve.

[0013] As a further improvement of this utility model: an abutment spring is embedded on one side of the abutment rod inside the sleeve, and a flow hole is opened on the outer wall of the sleeve.

[0014] The beneficial effects of this utility model are:

[0015] 1. This device is rotatably connected to the fixed rod and the rotating block, allowing the clamping plate to adaptively conform to the shape of the casting. Combined with the pull-down zero-point clamp, it can achieve reliable clamping and quickly establish the positioning reference, greatly improving the efficiency of changing castings with different shapes. At the same time, with the help of electromagnets and permanent magnet plates, the clamping plate is made to accurately embed into the clamping groove of the rotating block, which significantly enhances the structural stability and clamping rigidity, greatly improves the positioning accuracy, and fundamentally avoids clamping failure caused by loose parts during processing, effectively eliminating casting processing errors.

[0016] 2. This device uses a rotating plate and a mounting plate to adjust in tandem, allowing the mounting plate to conform to the shape of the workpiece between the clamping plates. This ensures the soft bladder is in close contact with the workpiece surface. A strong magnetic field is generated by the electromagnetic coil and iron core, causing the magnetorheological elastomer inside the soft bladder to solidify rapidly and completely conform to the casting contour, further enhancing the positioning effect. The sleeve, contact rod, and contact spring normally support the soft bladder. When conforming to the casting, the sleeve and contact rod expel the gas inside the sleeve, and the piston movement improves stability. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the rotating block structure of this utility model;

[0019] Figure 3 This is a schematic diagram of the mounting plate structure of this utility model;

[0020] Figure 4 This is a schematic diagram of the soft capsule structure of this utility model;

[0021] Figure 5 This is a schematic diagram of the flow hole structure of this utility model.

[0022] In the diagram: 1. Clamping platform; 2. Power frame; 3. Abutment frame; 4. Abutment plate; 5. Positioning mechanism; 501. Fixed rod; 502. Rotating block; 503. Clamping plate; 504. Zero-point clamp; 505. Electromagnet; 506. Permanent magnet plate; 507. Engaging plate; 508. Engaging groove; 6. Return spring; 7. Reinforcing mechanism; 701. Rotating plate; 702. Mounting plate; 703. Iron core; 704. Electromagnetic coil; 705. Soft bladder; 706. Sleeve; 707. Abutment rod; 708. Abutment spring; 709. Flow hole. Detailed Implementation

[0023] 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.

[0024] Example 1

[0025] like Figures 1 to 5As shown, a double-headed fixture for precision machining of castings includes a clamping table 1. A power frame 2 is fixedly installed on both sides of the top of the clamping table 1. A contact frame 3 is slidably connected inside the power frame 2. A contact plate 4 is fixedly installed at the front end of the contact frame 3. A positioning mechanism 5 is provided on one side of the contact plate 4. The positioning mechanism 5 includes a fixing rod 501, which is fixedly installed inside the contact plate 4. A rotating block 502 is rotatably connected to one end of the fixing rod 501. A clamping plate 503 is fixedly installed on the outer wall of the rotating block 502. A zero-point clamp 504 is embedded in the outer wall of the clamping plate 503. The contact plate 4 drives the fixing rod 501 to move towards the casting. The fixing rod 501, through the rotatably connected rotating block 502, allows the clamping plate 503 to adaptively adjust to the shape of the casting. Combined with the pull-down zero-point clamp 504, clamping and positioning references are achieved, thus enabling the use of different shapes and improving changeover efficiency.

[0026] Furthermore, an electromagnet 505 is embedded in one side of the fixed rod 501, and a permanent magnet plate 506 is slidably connected to the other side of the fixed rod 501. A locking plate 507 is fixedly installed on one side of the permanent magnet plate 506, and a locking groove 508 is opened on the axial outer wall of the rotating block 502. When there is contact, the electromagnet 505 is activated to push the permanent magnet plate 506 of the same magnetic pole material, so that the locking plate 507 is inserted into the locking groove 508 of the rotating block 502, thereby improving the overall stability and clamping rigidity, avoiding loosening of the clamping caused by loosening, and preventing errors in the casting.

[0027] Furthermore, a sliding structure is formed between the contact plate 4 and the clamping table 1, and a sliding structure is formed between the power frame 2 and the contact frame 3; the casting is placed on the clamping table 1, and then the hydraulic cylinder embedded in the power frame 2 works to push the contact frame 3 to slide along the power frame 2, providing clamping power.

[0028] Example 2

[0029] Improvements based on Embodiment 1: A reset spring 6 is fixedly installed inside the fixed rod 501 facing the permanent magnet plate 506, and a reinforcing mechanism 7 is provided on one side of the clamping plate 503; after processing is completed, the electromagnet 505 is disconnected, and the clamping plate 507 is reset by the elastic push of the reset spring 6, which facilitates adaptive adjustment and clamping of the next component.

[0030] Furthermore, the reinforcement mechanism 7 includes a rotating plate 701, which is rotatably connected to one end of the clamping plate 503. An mounting plate 702 is fixedly installed on the outer wall of the rotating plate 701. When the positioning mechanism 5 clamps, it works in conjunction with the rotating plate 701 and the mounting plate 702 to adaptively adjust between the clamping plates 503 according to the shape of the workpiece.

[0031] Furthermore, an iron core 703 extends through the inner wall of the mounting plate 702. An electromagnetic coil 704 is fixedly installed at one end of the iron core 703 that extends through the mounting plate 702, and a soft capsule 705 is fixedly installed on the side of the mounting plate 702 away from the electromagnetic coil 704. The rotation of the mounting plate 702 allows the magnetorheological elastomer inside the soft capsule 705 to conform to the shape of the workpiece. When the electromagnetic coil 704 is energized, it forms a strong magnetic field with the iron core 703. The magnetorheological elastomer is magnetized and solidifies, which can completely conform to the casting and play a positioning role to avoid loosening during processing, thereby further improving accuracy.

[0032] Furthermore, a sleeve 706 is fixedly installed on the outer wall of the mounting plate 702 on one side of the soft bladder 705, and an abutment rod 707 extends out from the inside of the sleeve 706; the sleeve 706 is fixed diagonally on the outer wall of the mounting plate 702 inside the soft bladder 705. Under normal circumstances, the soft bladder 705 is supported by the sleeve 706 and the abutment rod 707.

[0033] Furthermore, an abutment spring 708 is embedded on one side of the abutment rod 707 inside the sleeve 706, and a flow hole 709 is provided on the outer wall of the sleeve 706; when abutting the workpiece, the abutment spring 708 is compressed to contract, and in conjunction with the flow hole 709, gas flows through, forming piston movement, thereby improving stable operation.

[0034] Working principle: First, the casting is placed stably on the clamping table 1. Then, the hydraulic cylinder embedded in the power frame 2 is activated, pushing the contact frame 3 to slide smoothly along the guide trajectory of the power frame 2. This drives the contact plate 4 to drive the fixed rod 501 to move precisely towards the casting. The fixed rod 501 is connected to the rotating block 502, which allows the clamping plate 503 to flexibly follow the shape of the casting and complete adaptive adjustment. At the same time, with the pull-down zero-point clamp 504, reliable clamping can be achieved, and the positioning reference can be quickly established. This effectively adapts to castings with different shapes and significantly improves the efficiency of casting changeover. When the clamping plate 503 is in contact with the casting, the electromagnet 505 is activated. The electromagnetic force pushes the permanent magnet plate 506 of the same magnetic pole material, causing the locking plate 507 to be precisely inserted into the locking groove 508 of the rotating block 502. This greatly enhances the stability and clamping rigidity of the overall structure and improves the positioning accuracy. It also prevents clamping failure due to loose parts during processing, thereby preventing processing errors in the casting.

[0035] After processing is completed, the power supply to the electromagnet 505 is disconnected, and the clamping plate 507 automatically resets under the elastic force of the return spring 6, preparing for the adaptive adjustment and clamping of the next casting. While the positioning mechanism 5 performs clamping operations, the rotating plate 701 and the mounting plate 702 cooperate to adaptively adjust the mounting plate 702 between the clamping plates 503 according to the workpiece shape, ensuring that the soft capsule 705 on the mounting plate 702 fits tightly against the workpiece surface. At this time, the electromagnetic coil 704 is energized, and it works together with the neodymium iron boron core 703 to form a strong magnetic field, maintaining magnetic field stability. The magnetorheological elastomer inside the soft capsule 705, embedding magnetic particles such as carbonyl iron powder into the elastic rubber matrix, can conform to the casting contour. Under the influence of a strong magnetic field, the particles form a rigid chain structure, increasing stiffness by 10-100 times. They remain elastic in the absence of a magnetic field, and the deformation is less than 0.1μm under magnetic field fluctuations, further enhancing the positioning effect and effectively preventing workpiece loosening during processing. In addition, a sleeve 706 is diagonally fixed to the outer wall of the mounting plate 702 inside the soft capsule 705. Under normal conditions, the anti-collision spring 708 embedded inside the sleeve 706 pushes the anti-collision rod 707 through elastic force, providing support for the soft capsule 705. When the soft capsule 705 contacts the workpiece, the anti-collision rod 707 compresses the anti-collision spring 708 to achieve contraction. At the same time, the flow hole 709 on the sleeve 706 ensures gas flow under pressure, and the piston movement improves the stability of the process.

[0036] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0037] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A fixture for precision machining of double-headed castings, comprising a clamping table (1), characterized in that: The clamping platform (1) has a power frame (2) fixedly installed on both sides of its top end, and a contact frame (3) is slidably connected inside the power frame (2). A contact plate (4) is fixedly installed at the front end of the contact frame (3), and a positioning mechanism (5) is provided on one side of the contact plate (4). The positioning mechanism (5) includes a fixing rod (501), which is fixedly installed inside the contact plate (4). One end of the fixing rod (501) is rotatably connected to a rotating block (502). A clamping plate (503) is fixedly installed on the outer wall of the rotating block (502), and a zero-point clamp (504) is embedded in the outer wall of the clamping plate (503).

2. The fixture for precision machining of double-headed castings according to claim 1, characterized in that: An electromagnet (505) is embedded in one side of the fixed rod (501), and a permanent magnet plate (506) is slidably connected to the other side of the fixed rod (501). A locking plate (507) is fixedly installed on one side of the permanent magnet plate (506), and a locking groove (508) is opened on the axial outer wall of the rotating block (502).

3. The fixture for precision machining of double-headed castings according to claim 1, characterized in that: The contact plate (4) and the clamping platform (1) form a sliding structure, and the power frame (2) and the contact frame (3) form a sliding structure.

4. The fixture for finishing double-headed castings according to claim 2, characterized in that: A reset spring (6) is fixedly installed inside the fixed rod (501) facing the permanent magnet plate (506), and a reinforcing mechanism (7) is provided on one side of the clamping plate (503).

5. The fixture for precision machining of double-headed castings according to claim 4, characterized in that: The reinforcement mechanism (7) includes a rotating plate (701), which is rotatably connected to one end of the clamping plate (503), and an mounting plate (702) is fixedly installed on the outer wall of the rotating plate (701).

6. The fixture for precision machining of double-headed castings according to claim 5, characterized in that: An iron core (703) extends through the inner wall of the mounting plate (702), and an electromagnetic coil (704) is fixedly installed at one end of the iron core (703) that extends through the mounting plate (702). A soft bag (705) is fixedly installed on the side of the mounting plate (702) away from the electromagnetic coil (704).

7. The fixture for finishing double-headed castings according to claim 5, characterized in that: A sleeve (706) is fixedly installed on the outer wall of the mounting plate (702) on one side of the soft bladder (705), and an abutment rod (707) extends through the inside of the sleeve (706).

8. The fixture for finishing double-headed castings according to claim 7, characterized in that: An abutment spring (708) is embedded on one side of the abutment rod (707) inside the sleeve (706), and a flow hole (709) is provided on the outer wall of the sleeve (706).

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