Liquid expansion mandrel fixing device for machining hard chromium plated ball
By using a hydraulic expansion mandrel fixing device with a split-chamber design and a linkage structure, the problems of clamping force concentration and oil leakage caused by the single-chamber design are solved, achieving high-precision and high-efficiency clamping for hard chrome plated spheres and improving processing stability and efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANGHAI KEFENG ALLOY PRECISION CASTING CO LTD
- Filing Date
- 2025-05-20
- Publication Date
- 2026-04-10
AI Technical Summary
The single-chamber design of existing hydraulic expansion mandrel fixing devices results in the clamping force being concentrated in a local area, which can easily damage the coating. Furthermore, the mandrel positioning accuracy is limited and oil leakage affects the clamping stability.
The liquid expansion mandrel fixing device with a chamber design includes an expansion chamber and a compression chamber with separate cavities inside the mandrel body. The linkage structure achieves uniform expansion and clamping through a piston and a sliding column. The sealing screw adopts a sealing ring structure to prevent liquid leakage, and the locking screw adjusts the clamping force. The multi-stage expansion chamber improves uniformity.
It achieves a 40% improvement in clamping force uniformity, a coating damage rate reduced to <5%, a secondary processing concentricity of ≤0.005mm, and a clamping time shortened to 30 seconds/piece, making it suitable for mass production.
Smart Images
Figure CN224102403U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the hard chrome plating sphere processing technical field, concretely relates to a kind of liquid expansion mandrel fixing device for hard chrome plating sphere processing. BACKGROUND
[0002] In the field of hard chrome plating sphere processing, liquid expansion mandrel fixing device is a common clamping tool, mainly used for fixing sphere in chrome plating process, to ensure the stability and processing precision of sphere. Hard chrome plating sphere is widely used in automobile, aviation, mechanical equipment and other fields, and is usually used to reduce friction, improve wear resistance and prolong service life. In traditional fixing device, mechanical clamp or manual clamping method is usually used, but these methods have some shortcomings, such as insecure clamping, slow clamping speed, and difficult to guarantee processing precision. Liquid expansion mandrel fixing device realizes automatic clamping of sphere through hydraulic system, and can adjust clamping force and clamping position according to needs, with high flexibility and adjustability. Its core technical principle is to inject liquid into mandrel, and use hydraulic action to expand mandrel, so as to realize accurate clamping of sphere. This device not only can provide uniform and stable clamping force, but also can greatly improve processing efficiency, reduce manual operation and improve production automation level.
[0003] Existing liquid expansion mandrel usually adopts single-chamber hydraulic expansion structure, which pushes mandrel to expand and clamp workpiece through oil pressure, and has the following shortcomings: single-chamber design causes clamping force to concentrate in local area, which is easy to damage plating layer; mandrel positioning accuracy is limited by center hole machining error (such as cylindricity>0.003mm); oil leakage causes pressure fluctuation, affecting clamping stability. UTILITY MODEL CONTENTS
[0004] Therefore, the utility model provides a kind of liquid expansion mandrel fixing device for hard chrome plating sphere processing, which can solve the problem of existing liquid expansion mandrel single-chamber design causing clamping force to concentrate in local area, which is easy to damage plating layer.
[0005] The utility model is realized as follows:
[0006] The utility model provides a kind of liquid expansion mandrel fixing device for hard chrome plating sphere processing, wherein, including the mandrel main part, the inner part cavity of the mandrel main part is set, for realizing uniform expansion;One side of the mandrel main part is provided with filling hole, and the filling hole is used to inject hydraulic medium into the inside of the mandrel main part;Sealing screw is arranged at the opening of the filling hole;The inner part cavity of the mandrel main part is provided with expansion chamber and compression chamber, the compression chamber is arranged at the position of one side of the center axis of the mandrel main part, and the inside is provided with linkage structure, for clamping sphere.
[0007] The technical effect of the liquid-expanding mandrel fixing device for hard chromium plating sphere machining is as follows: the inner cavity of the mandrel body is designed to realize uniform expansion.
[0008] The side of the mandrel body is provided with a filling hole, which facilitates the injection of hydraulic medium into the mandrel. The opening of the filling hole is provided with a sealing screw to prevent liquid leakage. The sealing screw not only prevents liquid leakage, but also controls the flow of liquid, ensuring that the injected hydraulic medium can effectively drive the expansion of the mandrel and maintain the function of the liquid-expanding mandrel.
[0009] The mandrel body is provided with an expansion chamber and a compression chamber. The expansion chamber is used to realize the expansion of the mandrel, and the compression chamber is a key part for providing clamping force. The compression chamber is located on one side of the central axis of the mandrel, and a linkage structure is designed. By injecting hydraulic medium into the compression chamber to push the piston, the slide column is radially expanded to clamp the sphere. This design improves the clamping efficiency and shortens the clamping time.
[0010] Based on the above technical scheme, the liquid-expanding mandrel fixing device for hard chromium plating sphere machining can be further improved as follows:
[0011] The linkage structure includes a piston and a slide column. By injecting hydraulic medium into the compression chamber to push the piston, the slide column is radially expanded to clamp the sphere, thereby shortening the clamping time and improving the clamping efficiency.
[0012] The beneficial effects of the above improvement scheme are: the linkage structure is composed of a piston and a slide column. After the hydraulic medium is injected into the compression chamber, the piston pushes the slide column to expand and quickly clamp the sphere. This design greatly improves the clamping efficiency and reduces the clamping time, making the entire machining process more efficient.
[0013] Further, the sealing screw adopts a sealing ring structure to close the liquid channel.
[0014] The sealing ring structure of the sealing screw adopts a double-ring design to enhance the sealing performance.
[0015] The beneficial effects of the above improvement scheme are: the sealing screw adopts a sealing ring structure, and the sealing ring adopts a double-ring design. The purpose of this design is to enhance the sealing performance and prevent liquid leakage during use. The better the sealing performance, the higher the stability of the hydraulic system, which can more effectively control the expansion and clamping process and improve the working efficiency of the system.
[0016] Further, the inside of the compression chamber is provided with a locking screw near one side of the ram, which is used to adjust the pressure inside the compression chamber to realize quick control of the clamping force.
[0017] The beneficial effects of the above-mentioned improvement scheme are that the inside of the compression chamber is provided with a locking screw near one side of the ram, which is used to adjust the pressure inside the compression chamber to realize quick control of the clamping force. By adjusting the pressure, the force of clamping the ball can be accurately controlled, thereby ensuring the stability and accuracy of the ball during processing.
[0018] Further, the material of the sealing screw is selected from one of rubber and polyurethane.
[0019] The beneficial effects of the above-mentioned improvement scheme are that the material of the sealing ring of the sealing screw is selected from rubber or polyurethane, which has good elasticity and sealing performance, can effectively prevent liquid leakage, and is suitable for different working environments and pressure requirements to ensure stability during long-term use.
[0020] Further, the main body of the mandrel is in a cylindrical structure, and the surface corners are all designed as obtuse angles.
[0021] The beneficial effects of the above-mentioned improvement scheme are that the main body of the mandrel is in a cylindrical structure, and the surface corners are all designed as obtuse angles. This design not only improves the mechanical strength of the mandrel, but also prevents instability or damage caused by sharp corners during work. The design of obtuse angles enhances the durability and safety of the mandrel.
[0022] Further, the expansion chamber adopts a multi-stage structure to further improve uniformity.
[0023] The beneficial effects of the above-mentioned improvement scheme are that the expansion chamber adopts a multi-stage structure to further improve the uniformity during expansion. Through the multi-stage expansion design, the expansion process can be more accurately controlled, avoiding the uneven problem caused by single-stage expansion, thereby ensuring the stability of the clamping force and the accuracy of the ball processing.
[0024] Compared with the prior art, the liquid expansion mandrel fixing device for hard chromium plating ball processing has the following beneficial effects:
[0025] 1. The pressure balance technology in the sub-chamber eliminates local concentration of clamping force, protects the integrity of the plating layer, improves the uniformity of clamping pressure distribution by 40%, and reduces the plating layer damage rate to <5%.
[0026] 2. The bead bushing compensation mechanism makes the secondary processing concentricity ≤0.005mm.
[0027] 3. The adaptive locking mechanism reduces clamping time to 30 seconds per piece, making it suitable for mass production.
[0028] Among them, the concentricity of secondary processing refers to the coaxiality between the outer circle axis of the sphere and the machine tool spindle during the grinding process.
[0029] Coating uniformity refers to the requirement that the thickness and surface integrity of the hard chrome plating layer be controlled within ±5μm. Attached Figure Description
[0030] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model 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.
[0031] Fig. 1 This is a schematic diagram of the internal structure of a liquid expansion mandrel fixing device for machining hard chrome plated spheres;
[0032] Fig. 2 This is a schematic diagram of the external structure of a liquid expansion mandrel fixing device for machining hard chrome plated spheres;
[0033] The attached diagram lists the components represented by each number as follows:
[0034] 1. Mandrel body; 2. Expansion chamber; 3. Compression chamber; 4. Locking screw; 5. Filling hole; 6. Sealing screw; 7. Piston; 8. Sliding column. Detailed Implementation
[0035] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.
[0036] like Figs. 1-2 The image shows an embodiment of a hydraulic expansion mandrel fixing device for hard chrome plated spheres provided by this utility model. In this embodiment, it includes a mandrel body 1, which has internal cavities for uniform expansion. A filling hole 5 is provided on one side of the mandrel body 1 for injecting hydraulic medium into the mandrel body 1. A sealing screw 6 is provided at the opening of the filling hole 5. The internal cavities of the mandrel body 1 are divided into an expansion chamber 2 and a compression chamber 3. The compression chamber 3 is located on one side of the central axis of the mandrel body 1 and has a linkage structure inside for clamping the sphere.
[0037] Among them, in the above technical scheme, the linkage structure includes the piston 7 and the slide column 8, the piston 7 is pushed by injecting hydraulic medium into the compression chamber 3, so that the slide column 8 is expanded radially to clamp the ball, for shortening the clamping time and improving the clamping efficiency.
[0038] Further, in the above technical scheme, the sealing screw 6 adopts a sealing ring structure for closing the liquid channel.
[0039] The sealing ring structure of the sealing screw 6 is provided with double rings for enhancing the sealing property.
[0040] Further, in the above technical scheme, the side of the compression chamber 3 close to the slide column 8 is provided with the locking screw 4 for adjusting the pressure in the compression chamber 3 to realize the rapid control of the clamping force.
[0041] Further, in the above technical scheme, the material of the sealing screw 6 is selected from one of rubber and polyurethane.
[0042] Further, in the above technical scheme, the core shaft body 1 is a cylindrical structure, and the surface corners are all provided with obtuse angles.
[0043] Further, in the above technical scheme, the expansion chamber 2 adopts a multi-stage structure to further improve the uniformity.
[0044] Specifically, the principle of the utility model is that: when in use, liquid is injected into the compression chamber through the filling hole, the piston is pushed to move to the expansion chamber, and the slide column is uniformly expanded to clamp the ball. The locking screw adjusts the pressure of the compression chamber to adapt to different ball sizes; the sealing screw ensures long-term leakage-free.
Claims
1. A hydraulic expansion mandrel fixing device for machining hard chrome plated spheres, characterized in that, The utility model provides a kind of hydraulic chuck, including mandrel body (1), the inside cavity of the mandrel body (1) is arranged, for realizing uniform expansion;The side of the mandrel body (1) is provided with filling hole (5), the filling hole (5) is used to inject hydraulic medium to the inside of the mandrel body (1);The opening of the filling hole (5) is provided with sealing screw (6);The inside cavity of the mandrel body (1) is provided with expansion chamber (2) and compression chamber (3), the compression chamber (3) is arranged in the position of the center axis of the mandrel body (1) one side, and the inside is provided with linkage structure, for clamping ball.
2. A liquid expanding mandrel fixture for hard chrome plating of spheres as claimed in claim 1 wherein, The linkage structure includes piston (7) and slide column (8), by injecting hydraulic medium to the inside of the compression chamber (3) and pushing the piston (7), so that the slide column (8) is radially expanded, to clamp ball, for shortening clamping time, improve clamping efficiency.
3. A liquid expandable mandrel fixture for hard chrome plating of spheres as defined in claim 2 wherein, The sealing screw (6) adopts seal ring structure, for closing liquid passage; The seal ring structure of the sealing screw (6) adopts double-ring arrangement, for enhancing sealing property.
4. A liquid expandable mandrel fixture for hard chrome plating of spheres as defined in claim 3 wherein, The inside of the compression chamber (3) is provided with locking screw (4) near the side of the slide column (8), for adjusting the pressure inside the compression chamber (3), realizes the quick control of clamping force.
5. A liquid expandable mandrel fixture for hard chrome plating of spheres as defined in claim 4 wherein, The material of the sealing screw (6) is selected from one of rubber and polyurethane.
6. A liquid-expandable mandrel fixture for hard chrome plating of spheres, according to claim 5, wherein, The mandrel body (1) is cylindrical structure, and the surface corner is all provided as obtuse angle.
7. A liquid-expandable mandrel fixture for hard chrome plating of spheres, according to claim 6, wherein, The expansion chamber (2) adopts multistage structure, to further improve uniformity.