A thin-walled cylinder sleeve jig of an incubator

Abstract

The utility model relates to mechanical processing fixture technical field discloses a kind of thin-walled cylinder sleeve fixtures of thermostat, the fixture includes shelf, support plate, support plate, flexible clamping component and pressure maintaining component, flexible clamping component is through belt ring embrace clamping workpiece side wall, and pressure maintaining component is through the heat sink of screw drive, with the heat sink of multiple layers annular radiating fin, controllable axial pressure is applied to workpiece from top, utilize the embrace action of flexible belt, make clamping force evenly distributed, solve the serious mechanical deformation problem caused by stress concentration;Meanwhile, the compact structure with radiating fin can be quickly heat exchanged with constant temperature environment, avoid the thermal shock to workpiece, solve the thermal deformation problem.The utility model significantly improves the clamping stability and final size and shape accuracy of thin-walled workpiece in high-precision constant temperature processing.

Description

Technical Field

[0001] This application relates to the field of machining fixture technology, and in particular to a thin-walled cylinder liner fixture for a constant temperature chamber. Background Technology

[0002] Currently, cylinder liners are core components in precision machinery such as engines, and the roundness, cylindricity, and other dimensional and positional tolerances of their inner bores directly affect the overall performance of the machine. To obtain high-precision cylinder liners, they typically require precision machining, such as boring and honing. During the machining process, fixtures must be used to stably and reliably position and clamp the cylinder liner to resist machining cutting forces and ensure machining accuracy and repeatability.

[0003] However, with the trend towards lightweight and high-efficiency engines, thin-walled cylinder liners are being used more and more widely. These cylinder liners have thin walls and poor rigidity, making them highly susceptible to elastic deformation under external forces. Traditional fixtures, such as three-jaw chucks or clamps using rigid blocks, typically concentrate their clamping force on a few limited points or a small area. When this concentrated clamping force acts on a thin-walled cylinder liner, it can easily cause localized indentation or overall deformation of the cylinder, for example, clamping it into an elliptical shape. When the workpiece is machined in this deformed state, after machining is complete and the clamping force is removed, the workpiece experiences shape errors due to elastic recovery, resulting in key indicators such as roundness of the final product exceeding tolerances and failing to meet usage requirements.

[0004] Regarding the aforementioned technologies, and furthermore, for some applications requiring extremely high precision, the machining process needs to be carried out in a constant temperature chamber to eliminate the impact of thermal expansion and contraction of materials due to temperature changes on the final dimensional accuracy. Under such conditions, the design of the fixture itself also faces new challenges. Conventional fixture clamps or grippers are usually solid metal structures with a large heat capacity. When in contact with the workpiece, they exchange heat with it, acting as a localized "cold source" or "heat source," disrupting the uniformity of the workpiece's surface temperature field. This uneven temperature distribution causes thermal stress and uneven thermal deformation within the workpiece, introducing new machining errors and offsetting the precision advantages brought by the constant temperature environment. Summary of the Invention The purpose of this application is to provide a fixture for thin-walled cylinder liners in a constant temperature chamber, which aims to improve the problems of concentrated clamping force that easily leads to mechanical deformation of the workpiece, and the problem of clamping components disrupting the uniformity of the temperature field of the workpiece in the constant temperature chamber, thus causing thermal deformation.

[0005] A thin-walled cylinder liner fixture for a constant temperature chamber includes: a frame, a support plate and a backing plate disposed on the frame; and a flexible clamping assembly, a pressure holding assembly and a fixing claw disposed on the frame.

[0006] The flexible clamping assembly includes a belt for encircling the workpiece and a buckle for driving the belt to tighten; the pressure holding assembly includes a shaft fixing block, a shaft, and a heat sink connected to the lower end of the shaft.

[0007] Furthermore, the pressure-holding assembly is mounted on the frame and located above the support plate, with its rotating shaft threadedly engaged with the rotating shaft fixing block. The flexible clamping assembly is mounted on the frame, and its belt can form a clamping structure that encircles the workpiece. The support plate and the fixing claw are both fixed to the frame. Preferably, the upper surface of the support plate is provided with a positioning groove for radial positioning of the thin-walled cylinder liner.

[0008] Preferably, the support plate is vertically fixed to the frame, and its sidewall is adjacent to the edge of the positioning groove, for providing initial auxiliary support for the workpiece.

[0009] Preferably, the support plate with the positioning groove is also provided with a cable groove for accommodating the cable.

[0010] Preferably, the flexible clamping assembly includes clamping units symmetrically arranged on opposite sides of the support plate, and each clamping unit includes a belt and a buckle.

[0011] Preferably, the bottom surface of the heat sink is a flat pressure plate, and its outer peripheral wall is provided with multiple layers of annular heat dissipation fins integrally formed.

[0012] Preferably, the rotating shaft is an externally threaded lead screw, and the rotating shaft fixing block is provided with an internally threaded through hole that meshes with the externally threaded lead screw.

[0013] Preferably, as a specific implementation, the rotating shaft fixing block is fixed to the upper part of the frame through a connecting structure and is horizontally positioned directly above the center of the support plate.

[0014] Preferably, the fixing claw is disposed on the main structure of the frame and is used to connect and fix the entire fixture to the external processing equipment.

[0015] In summary, this application includes at least one of the following beneficial technical effects: 1. In this utility model, by using a flexible belt to clamp the thin-walled cylinder liner in a ring-like manner, and cooperating with a pressing mechanism with heat dissipation fins on the top to apply axial pressure, the problem of radial deformation of the workpiece due to stress concentration and potential disruption of workpiece temperature uniformity during clamping is solved by using rigid clamps in the prior art. This achieves the technical effects of uniform clamping force distribution, effectively avoiding workpiece deformation under clamping pressure, and maintaining the thermal balance of the workpiece in a constant temperature environment, thereby significantly improving the machining accuracy of the thin-walled cylinder liner.

[0016] 2. In this utility model, the reference positioning is achieved by a support plate with a positioning groove at the bottom, the side is circumferentially flexible and clamped, and the top is axially pressured by a screw-driven clamping mechanism. This multi-directional composite clamping principle solves the problems of unstable positioning or single limiting direction of traditional fixtures, which can easily cause vibration or displacement of the workpiece during processing. It achieves the technical effect of reliable limiting and locking of the workpiece with multiple degrees of freedom, and ensures the stability of the processing process. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of a thin-walled cylinder liner fixture for a constant temperature chamber proposed in this utility model. Figure 2 This is a schematic diagram of the support plate portion of a thin-walled cylinder liner fixture for a constant temperature chamber proposed in this utility model. Figure 3 This is a schematic diagram of the belt section of a thin-walled cylinder liner fixture for a constant temperature chamber proposed in this utility model. Figure 4 This is a schematic diagram of the locking part of a thin-walled cylinder liner fixture for a constant temperature chamber proposed in this utility model. Figure 5 This is a schematic diagram of the heat sink portion of a thin-walled cylinder liner fixture for a constant temperature chamber proposed in this utility model. Explanation of reference numerals in the attached drawings: 1. Frame; 2. Pressure holding assembly; 201. Shaft; 202. Heat sink; 203. Support plate; 204. Cable tray; 205. Lock; 206. Belt; 207. Shaft fixing block; 208. Fixing claw; 3. Support plate. Detailed Implementation

[0018] The following is in conjunction with the appendix Figure 1 -Appendix Figure 5 This application will be described in further detail below.

[0019] Example 1: A thin-walled cylinder liner fixture for a constant temperature chamber, referring to... Figure 1 The invention includes a thin-walled cylinder liner fixture for a constant temperature chamber, which aims to solve the problem in the prior art that uneven clamping force or uneven heat conduction can easily cause workpiece deformation when clamping thin-walled cylinder liners, thus affecting machining accuracy.

[0020] like Figure 1As shown, the thin-walled cylinder liner fixture of the constant temperature chamber includes a frame 1 as the overall base. A support plate 203 and a support plate 3 are fixedly connected to the frame 1 by bolts or welding. The support plate 3 is set perpendicular to the support plate 203 and its side wall is adjacent to the edge of the support plate 203. A positioning groove is integrally formed or machined at the center of the upper surface of the support plate 203. The inner wall of the positioning groove radially limits the bottom of the thin-walled cylinder liner placed therein. At the same time, the side wall of the thin-walled cylinder liner can be assisted in straightening by relying on the support plate 3. A cable groove 204 for accommodating and organizing cables is also provided on the support plate 203.

[0021] like Figure 1 , Figure 3 , Figure 4 and Figure 5 As shown, the frame 1 is also fixed with a flexible clamping assembly, a pressure holding assembly 2, and a fixing claw 208. The flexible clamping assembly includes clamping structures symmetrically arranged on both sides of the support plate 203. Each clamping structure includes a belt 206 and a buckle 205. The buckle 205 is connected to one end of the belt 206 and is used to drive the belt 206 to tighten to form a structure that hugs and clamps the side wall of the workpiece. The pressure holding assembly 2 is located on the upper part of the frame 1 and is laterally positioned above the central axis of the support plate 203. The pressure holding assembly 2 includes a rotating shaft fixing block 207, a rotating shaft 201, and a heat sink 202. The rotating shaft fixing block 207 is fixedly connected to the frame 1 by bolts. The rotating shaft fixing block 207 is provided with... There is an internal threaded through hole. The rotating shaft 201 is an external threaded lead screw. The upper part of the rotating shaft 201 passes through the internal threaded through hole of the rotating shaft fixing block 207 and is threadedly engaged with it to form a rotational and axial sliding connection. The heat sink 202 is fixedly connected to the lower end of the rotating shaft 201 through the center of its top surface. The bottom surface of the heat sink 202 is a flat pressure plate structure for contacting the top end face of the workpiece. The outer peripheral wall of the heat sink 202 is integrally formed with multiple layers of annular heat dissipation fins. The main structure of the frame 1 is also fixed with a fixing claw 208 by welding or bolts. The fixing claw 208 is used to connect and fix the entire fixture to the external processing equipment to ensure the overall stability during the processing.

[0022] The implementation principle of this application embodiment is as follows: a circular positioning groove adapted to the outer diameter of the thin-walled cylinder liner can be machined on the upper surface of the support plate 203. This positioning groove provides a precise radial positioning reference for the workpiece. Simultaneously, one or more grooves 204 can be formed on the support plate 203, such as... Figure 2 As shown, the cable tray 204 is used to store and plan the path of the cables of the sensor or heating element during the processing to avoid interference between the cables and moving parts.

[0023] Example 2: A thin-walled cylinder liner fixture for a constant temperature chamber. The two clamping units are symmetrically fixed to the frame 1 with the center of the support plate 203 as the reference. When the locking buckles 205 on both sides synchronously drive the belt 206 to tighten, they can apply equal and opposite radial clamping forces to the workpiece, thereby ensuring uniform force on the workpiece; to enhance the pressure holding and temperature uniformity effects, like Figure 5 As shown, the structure of the heat sink 202 can be further optimized. Its bottom surface is a flat pressure plate that has been precision ground to ensure complete contact with the top end face of the workpiece and uniform pressure transmission. Its outer peripheral wall is integrally formed with multiple layers of horizontally arranged annular heat dissipation fins. This structure significantly increases the contact area between the heat sink 202 and the ambient air inside the constant temperature chamber, thereby accelerating the heat exchange efficiency.

[0024] like Figure 1 As shown, the specific structure of the rotating shaft 201 is an external threaded screw with a trapezoidal thread or a ball screw structure. The rotating shaft fixing block 207 is provided with an internal threaded through hole that precisely meshes with it. By rotating the rotating shaft 201, the heat sink 202 can be driven to achieve a smooth and small axial feed. In order to ensure the coaxiality of the pressure application, the rotating shaft fixing block 207 is preferably fixed to the upper part of the frame 1 by a high-strength connection structure and is horizontally positioned above the center of the positioning groove on the support plate 203.

[0025] Working Principle: When the thin-walled cylinder liner fixture of the constant temperature chamber is in operation, the thin-walled cylinder liner is first placed vertically in the positioning groove of the support plate 203. Its sidewalls can be initially stabilized by the support plate 3. Then, the locking buckles 205 fixed on both sides of the frame 1 are activated, and the drive belt 206 is simultaneously tightened. The belt 206 then wraps around and evenly adheres to the outer peripheral wall of the thin-walled cylinder liner, applying a uniformly distributed radial clamping force. Next, the rotating shaft 201 is rotated by an external drive device. Since the rotating shaft 201 and the rotating shaft fixing block 207 are threadedly fitted, the rotating shaft 201 will smoothly descend along its axial direction while rotating, thereby driving the heat sink 202 connected to its lower end to move downwards synchronously until the heat sink 202... The flat bottom surface is pressed against the top end face of the thin-walled cylinder liner, applying a controllable axial pressure. At this time, the workpiece is reliably fixed in both the radial and axial directions. The entire fixture is connected to the external equipment through the fixing claw 208, and the high-precision machining process can begin. In the entire constant temperature chamber environment, the heat dissipation fins on the heat sink 202 fully exchange heat with the ambient air, ensuring that no local temperature difference is generated when it transmits pressure to the workpiece, thereby maintaining the uniformity of the overall temperature of the workpiece. The cables are organized through the cable groove 204 on the support plate 203 to avoid interference. After the machining is completed, the shaft 201 is rotated in the opposite direction to lift the heat sink 202, and the lock 205 is released to loosen the belt 206, so that the machined workpiece can be taken out.

[0026] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be included within the scope of protection of this application.

Claims

1. A thin-walled cylinder liner fixture for a constant temperature chamber, comprising a frame (1), wherein the frame (1) is provided with a support plate (203) and a support plate (3), characterized in that, Also includes: A flexible clamping assembly is disposed on the frame (1) and includes a belt (206) and a buckle (205) connected to the belt (206). A pressure-holding assembly (2), which is disposed on the frame (1) and located above the support plate (203), the pressure-holding assembly (2) includes a shaft fixing block (207), a shaft (201) threadedly engaged with the shaft fixing block (207), and a heat sink (202) connected to the lower end of the shaft (201); and A fixing claw (208) is fixed to the frame (1).

2. The thin-walled cylinder liner fixture for a constant temperature chamber according to claim 1, characterized in that, The upper surface of the support plate (203) is provided with a positioning groove for radial positioning of the thin-walled cylinder liner.

3. A thin-walled cylinder liner fixture for a constant temperature chamber according to claim 2, characterized in that, The support plate (3) is vertically fixed to the frame (1), and the side wall of the support plate (3) is adjacent to the edge of the positioning groove.

4. A thin-walled cylinder liner fixture for a constant temperature chamber according to claim 1, characterized in that, The support plate (203) is also provided with a cable groove (204) for accommodating cables.

5. A thin-walled cylinder liner fixture for a constant temperature chamber according to claim 1, characterized in that, The flexible clamping assembly includes clamping units symmetrically arranged on opposite sides of the support plate (203), and each clamping unit includes the belt (206) and the buckle (205).

6. A thin-walled cylinder liner fixture for a constant temperature chamber according to claim 1, characterized in that, The bottom surface of the heat sink (202) is a flat pressure plate, and the outer peripheral wall of the heat sink (202) is provided with multiple layers of annular heat dissipation fins.

7. A thin-walled cylinder liner fixture for a constant temperature chamber according to claim 1, characterized in that, The rotating shaft (201) is an external threaded screw; the rotating shaft fixing block (207) is provided with an internal threaded through hole that meshes with the external threaded screw.

8. A thin-walled cylinder liner fixture for a constant temperature chamber according to claim 1, characterized in that, The rotating shaft fixing block (207) is fixed to the upper part of the frame (1) by a connecting structure and is horizontally positioned directly above the center of the support plate (203).

9. A thin-walled cylinder liner fixture for a constant temperature chamber according to claim 1, characterized in that, The fixing claw (208) is disposed on the main structure of the frame (1) and is used to connect the entire fixture to external processing equipment.

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