A tooling fixture for machining an inner circle

Abstract

This utility model relates to the technical field of tooling fixtures for machining inner circles, and discloses a tooling fixture for machining inner circles, including a clamping base. The clamping base is provided with a clamping mechanism and a constant weight adjustment mechanism. The constant weight adjustment mechanism is located on the lower side of the clamping mechanism. The clamping mechanism includes multiple sliding grooves, all of which are opened inside the clamping platform. The cross-section of each sliding groove is convex. Each sliding groove is slidably connected to a clamping platform. A stop block is fixedly connected to the far side of each clamping platform, and a jaw is fixedly connected to the near side of each clamping platform. An adjusting plate is rotatably connected inside the clamping base. The adjusting plate has multiple guide grooves, and a sliding rod is slidably connected inside each guide groove. The clamping mechanism is used to clamp the workpiece, thereby improving clamping stability and reducing damage. The constant weight adjustment mechanism is used to provide adjustment for the clamping mechanism and eliminate the problem of unstable chuck center of gravity, thereby improving machining accuracy.

Description

Technical Field

[0001] This utility model relates to the field of tooling fixtures for machining inner circles, specifically a tooling fixture for machining inner circles. Background Technology

[0002] When machining the inner diameter of thin-walled or easily deformable workpieces (such as internal turning, boring, and grinding), a fixture is usually required. The core principle is to utilize the elastic or expansion elements inside the fixture to apply radial pressure evenly and synchronously to the workpiece hole wall, achieving reliable centering and clamping while greatly reducing clamping deformation. Common implementation methods each have their own characteristics: for example, simple elastic sleeves (such as spring collets and corrugated sleeves) are low-cost and quick to clamp, widely used in small to medium batch production, but their clamping force, accuracy, and lifespan are relatively limited; while liquid plastic fixtures utilize the fluidity of incompressible plastics to transmit pressure, achieving extremely high centering accuracy (up to 0.003 mm), making them particularly suitable for precision machining.

[0003] Common three-jaw chucks are widely used due to their good clamping flexibility and low cost. However, because they use an internal threaded disc to drive multiple jaws for clamping, they require adjustment components to control the jaws' gripping ability. This results in uneven weight distribution within the chuck. Even if this error is small, it can still cause radial runout when the chuck rotates at high speed, affecting product accuracy. Furthermore, the clamping area between the jaws and the workpiece is often insufficient, which can easily cause slight deformation of the workpiece surface. Changing between different processes can also lead to errors. Utility Model Content

[0004] The purpose of this utility model is to provide a tooling fixture for machining inner circles, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a tooling fixture for machining inner circles, comprising a clamping base, wherein a clamping mechanism and a constant weight adjustment mechanism are provided inside the clamping base, and the constant weight adjustment mechanism is disposed on the lower side of the clamping mechanism;

[0006] The clamping mechanism includes multiple sliding grooves, all of which are formed inside the clamping platform. The cross-section of each sliding groove is convex. Each sliding groove is slidably connected to a clamping platform. A stop block is fixedly connected to the opposite side of each clamping platform, and a gripper is fixedly connected to the adjacent side of each clamping platform. An adjusting plate is rotatably connected inside the clamping platform. Multiple guide grooves are formed inside the adjusting plate. A sliding rod is slidably connected inside each guide groove. A sliding disk is fixedly connected to the lower end of each sliding rod, and the sliding disk is slidably connected to the lower surface of the adjusting plate.

[0007] Preferably, the clamping platform has the same cross-section as the slide groove.

[0008] Preferably, the grippers are all configured as triangular structures with arc surfaces on both sides.

[0009] Preferably, the guide grooves are all configured as arc-shaped structures with both ends close to the inner and outer diameters of the adjustment disc, and the adjustment column and the positioning column are configured with the same height and length.

[0010] Preferably, the constant weight adjustment mechanism includes a connecting seat, which is fixedly connected to the lower surface of the adjustment disc and rotatably connected to the clamp. Multiple adjusting columns are fixedly connected inside the connecting seat and are evenly distributed on the outer side of the connecting seat. Multiple positioning columns are fixedly connected to the inner wall of the clamp. A collar is rotatably connected to the outer wall of each adjusting column. A liquid supply sleeve is rotatably connected to the outer wall of each positioning column. A piston cylinder is fixedly connected to one of the adjacent sides of each liquid supply sleeve. A piston disc is slidably connected inside each piston cylinder. A piston rod is fixedly connected to one of the adjacent sides of each piston disc. Each piston rod is fixedly connected to an adjacent collar. A flange rotary joint is fixedly connected to the lower surface of the clamp, and the flange rotary joint communicates with the interior of each piston cylinder.

[0011] Preferably, the flange rotary joint is internally connected to a flow divider / combiner valve that communicates with each piston cylinder.

[0012] Preferably, the length of the piston cylinder is greater than the distance between the adjusting column and the positioning column.

[0013] Compared with the prior art, this utility model provides a tooling fixture for machining inner circles, which has the following beneficial effects:

[0014] 1. The clamping mechanism is used to clamp the workpiece. The mechanism uses multiple jaws to perform the clamping motion of the workpiece, which is equivalent to that of a three-jaw chuck. The jaws in the mechanism are evenly distributed and have plate-like extensions, which makes it easier for the device to fit with the surface of the workpiece, thereby improving the clamping stability and reducing damage.

[0015] 2. The constant weight adjustment mechanism is used to adjust the clamping mechanism and eliminate the problem of unstable chuck center of gravity. This mechanism uses multiple evenly distributed piston cylinders to rotate and adjust the adjustment plate. With the guidance adjustment of the guide groove and slide rod, the device can ensure clamping and uniform gravity distribution under rapid clamping. This prevents the device from radially jumping due to centrifugal force caused by uneven gravity, thus improving the machining accuracy. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments 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.

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

[0018] Figure 2 This is a structural schematic diagram from another perspective of the present invention;

[0019] Figure 3 This is a schematic diagram of a half-section of the present invention;

[0020] Figure 4 This is a schematic diagram of the clamping platform in this utility model;

[0021] Figure 5 This is a schematic diagram of the positioning column in this utility model.

[0022] In the diagram: 1. Clamping seat; 2. Clamping mechanism; 201. Slide groove; 202. Clamping platform; 203. Stop block; 204. Clamping claw; 205. Adjusting disc; 206. Guide groove; 207. Slide rod; 208. Slide plate; 3. Constant weight adjustment mechanism; 301. Connecting seat; 302. Adjusting column; 303. Positioning column; 304. Collar; 305. Liquid supply rotating sleeve; 306. Piston cylinder; 307. Piston disc; 308. Piston rod; 309. Flange rotary joint. 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] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0025] Example 1:

[0026] Please see Figure 1-5 This utility model provides a technical solution: a tooling fixture for processing inner circles, including a clamping base 1, a clamping mechanism 2 and a constant weight adjustment mechanism 3 are provided inside the clamping base 1, and the constant weight adjustment mechanism 3 is located on the lower side of the clamping mechanism 2;

[0027] This mechanism is used to clamp workpieces. It increases the clamping contact area. The clamping mechanism 2 includes multiple slide grooves 201, all of which are opened inside the clamping platform 202. The cross-section of each slide groove 201 is convex. Each slide groove 201 is slidably connected to the clamping platform 202. A stop block 203 is fixedly connected to the side of the clamping platform 202 that is far apart from each other. A gripper 204 is fixedly connected to the side of the clamping platform 202 that is close to each other. An adjusting plate 205 is rotatably connected inside the clamping base 1. Multiple guide grooves 206 are opened inside the adjusting plate 205. Each guide groove 206 is slidably connected to a slide rod 207. Each slide rod 207 is fixedly connected to a slide plate 208 at its lower end. The slide plates 208 are slidably connected to the lower surface of the adjusting plate 205.

[0028] Furthermore, the clamping platform 202 has the same cross-section as the slide 201.

[0029] Furthermore, the grippers 204 are all configured as triangular structures with rounded surfaces on both sides.

[0030] Furthermore, the guide grooves 206 are all set as arc-shaped structures with their two ends close to the inner and outer diameters of the adjusting plate 205, respectively, and the adjusting column 302 and the positioning column 303 are set with the same height and length.

[0031] Example 2:

[0032] This mechanism is used to adjust and lock the position of the gripper 204. It rotates the adjusting disc 205 via evenly distributed piston cylinders 306, and its interaction with the guide groove 206 and slide rod 207 ensures strong synchronization during adjustment, preventing instability of the chuck's center of gravity. (Please refer to...) Figure 1-5 Furthermore, in conjunction with Embodiment 1, the constant weight adjustment mechanism 3 includes a connecting seat 301, which is fixedly connected to the lower surface of the adjustment disc 205. The connecting seat 301 is rotatably connected to the clamp 1. Multiple adjusting columns 302 are fixedly connected inside the connecting seat 301. The adjusting columns 302 are evenly distributed on the outer side of the connecting seat 301. Multiple positioning columns 303 are fixedly connected to the inner wall of the clamp 1. A collar 304 is rotatably connected to the outer wall of each adjusting column 302. A liquid supply rotating sleeve 305 is rotatably connected to the outer wall of each positioning column 303. A piston cylinder 306 is fixedly connected to the side of the liquid supply rotating sleeve 305 that is close to each other. A piston disc 307 is slidably connected inside each piston cylinder 306. A piston rod 308 is fixedly connected to the side of the piston disc 307 that is close to each other. The piston rod 308 is fixedly connected to the collar 304 that is close to each other. A flange rotary joint 309 is fixedly connected to the lower surface of the clamp 1. The flange rotary joint 309 is connected to the interior of each piston cylinder 306.

[0033] Furthermore, the flange rotary joint 309 is internally connected to a flow divider / combiner valve that communicates with each piston cylinder 306.

[0034] Furthermore, the length of piston cylinder 306 is greater than the distance between adjusting column 302 and positioning column 303.

[0035] In actual operation, when this device is used, the user connects the lathe output shaft through the flange rotary joint 309 to the clamp 1, fixes the other end of the flange rotary joint 309 and supplies controllable hydraulic pressure, or the user supplies pressure to the piston cylinder 306 through other existing conventional hydraulic supply methods. After the device is connected, the user can place the workpiece inside the multiple jaws 204. Then the user starts the hydraulic supply device and uses similar valves such as the flow divider and combiner valve to provide the same hydraulic pressure to each piston cylinder 306. The hydraulic pressure controls the piston rod 308 to extend. The piston rod 308 pushes the collar 304 to make the adjusting plate 205 rotate. After the adjusting plate 205 rotates, it forces the slide rod 207 to make radial displacement along the slide groove 201 through multiple guide grooves 206. At this time, the jaws 204 approach each other and thus clamp the workpiece. Then the user can start the lathe and perform processing.

[0036] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A tooling fixture for machining inner circles, comprising a clamping base (1), characterized in that: The clamp (1) is provided with a clamping mechanism (2) and a constant weight adjustment mechanism (3) inside, and the constant weight adjustment mechanism (3) is located on the lower side of the clamping mechanism (2); The clamping mechanism (2) includes multiple sliding grooves (201), each of which is located inside the clamping platform (202). The cross-section of each sliding groove (201) is convex. Each sliding groove (201) is slidably connected to the clamping platform (202). A stop block (203) is fixedly connected to the side of each clamping platform (202) that is far apart from each other. A gripper (204) is fixedly connected to the side of each clamping platform (202) that is close to each other. An adjusting plate (205) is rotatably connected inside the clamping base (1). Multiple guide grooves (206) are provided inside the adjusting plate (205). Each guide groove (206) is slidably connected to a sliding rod (207). Each sliding rod (207) is fixedly connected to a sliding disk (208) at its lower end. Each sliding disk (208) is slidably connected to the lower surface of the adjusting plate (205).

2. The tooling fixture for machining inner circles according to claim 1, characterized in that: The clamping platform (202) has the same cross-section as the slide (201).

3. The tooling fixture for machining inner circles according to claim 1, characterized in that: The grippers (204) are all configured as triangular structures with arc surfaces on both sides.

4. A tooling fixture for machining inner circles according to claim 1, characterized in that: The guide grooves (206) are all set as arc-shaped structures with their two ends close to the inner and outer diameters of the adjusting plate (205), respectively, and the adjusting column (302) and the positioning column (303) are set with the same height and length.

5. A tooling fixture for machining inner circles according to claim 1, characterized in that: The constant weight adjustment mechanism (3) includes a connecting seat (301), which is fixedly connected to the lower surface of the adjustment plate (205). The connecting seat (301) is rotatably connected to the clamp (1). Multiple adjusting columns (302) are fixedly connected inside the connecting seat (301). The adjusting columns (302) are evenly distributed on the outside of the connecting seat (301). Multiple positioning columns (303) are fixedly connected to the inner wall of the clamp (1). Each adjusting column (302) has a collar (304) rotatably connected to its outer wall. The outer wall of each piston cylinder (306) is rotatably connected to a liquid supply sleeve (305). A piston cylinder (306) is fixedly connected to the side of each liquid supply sleeve (305). A piston disc (307) is slidably connected inside each piston cylinder (306). A piston rod (308) is fixedly connected to the side of each piston disc (307). The piston rod is fixedly connected to the adjacent collar (304). A flange rotary joint (309) is fixedly connected to the lower surface of the clamp (1). The flange rotary joint is connected to the interior of each piston cylinder (306).

6. A tooling fixture for machining inner circles according to claim 5, characterized in that: The flange rotary joint (309) is internally connected to a flow divider and collector valve that is connected to each piston cylinder (306).

7. A tooling fixture for machining inner circles according to claim 5, characterized in that: The length of the piston cylinder (306) is greater than the distance between the adjusting column (302) and the positioning column (303).

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