CN103612166A - Curved turbulence polishing device with pressure equalizing grooves - Google Patents

Abstract

A curved surface turbulent polishing device with a pressure equalizing groove, including a restraining member, the restraining member is set outside the artificial joint, the inner surface of the restraining member is the same shape as the outer surface of the artificial joint, and a profiling is formed between the inner surface of the restraining member and the outer surface of the artificial joint There are at least two groups of abrasive grain flow inlets and outlets on the restraining member, grooves are formed around the abrasive grain outlets to form pressure equalization grooves, and the pressure equalization grooves are distributed on the inner surface of the restraint member. The grooves are connected. The invention constructs a controlled profiling flow channel of abrasive particle flow through the constraining member, and the constraining member is provided with multiple sets of abrasive particle inflow and outflow inlets, and the complex curved surface is processed in sections, avoiding the abrasive particle flow being resisted at the inflection point or singular point of the curved surface. In the case of uneven polishing, a pressure equalizing groove is provided around the abrasive grain outflow inlet to evenly distribute the pressure to the inner surface of the constraining member, which can improve the problem of high-pressure interference at the inlet to a certain extent, and the polishing effect is good and the precision is high.

Description

Curved surface turbulence polishing device with pressure equalization groove

technical field

The invention relates to the field of abrasive flow polishing processing, in particular to a turbulent flow precision processing device for a titanium alloy artificial joint.

Background technique

The smoothness of the artificial joint surface has a crucial impact on its function and service life. Therefore, the formed titanium alloy artificial joint prosthesis cannot be directly applied to the inside of the human body, and it needs to go through a series of grinding and polishing. Subsequent processing will finally obtain a high-precision and high-gloss surface, forming an artificial joint that fits well with human bones.

The surface of the artificial joint is a complex curved surface with different curvatures, and the thermal conductivity and cutting performance of titanium alloy are poor. In the existing surface precision machining technology, most of the methods are difficult to apply. Since the abrasive flow can form a good profiling contact, it shows advantages in the processing of curved surfaces and special-shaped surfaces. Now the abrasive flow forms some surface processing methods, such as using high-pressure and high-speed abrasive flow to spray the surface of the workpiece, and using abrasive particles to collide at high speed. The shearing effect of this method realizes precision machining; this method is based on the theory of erosion wear, and it is easy to cause elastic deformation or plastic indentation on the surface of the workpiece due to the strong scraping of abrasive particles, which cannot meet the surface processing requirements of artificial joints. The patent application number is 201110041218.8's "New Method of Turbulent Precision Machining of Titanium Alloy Artificial Joint Surface and Its Special Device" provides a new method of turbulent precision machining of partially covered and constrained titanium alloy artificial joint. , the turbulent flow is formed in the flow channel of the outer surface of the artificial joint prosthesis and the inner surface of the matching mold, and the surface is gradually smoothed by using the frequent action of micro-force and micro-cutting of the abrasive grains. Although this method can achieve better processing results, the artificial joint The surface is a complex curved surface, and the abrasive flow is easily blocked when it passes through the sudden point of the inflection point and the singular point of the artificial joint surface, and the closer to the curved surface, the viscous damping of the abrasive flow reduces the tangential velocity fluctuation, and the complex curved surface prevents The normal velocity pulsation, in the area a little far away from the curved surface, due to the increase of the average velocity gradient of the abrasive flow, the turbulent kinetic energy of the abrasive flow rapidly increases, making the polishing uneven and difficult to achieve the ideal polishing effect. On the other hand, The pressure and speed at the inlet of the abrasive grains are high, and the polishing intensity is high, while near the outlet, the speed and pressure are both reduced, making the polishing uneven, which greatly affects the polishing quality and precision.

Contents of the invention

Aiming at the difficult problem of finishing complex curved surfaces of titanium alloy artificial joints, the invention provides a curved surface turbulent polishing device with good polishing performance and high precision with pressure equalizing grooves.

The technical solution adopted by the present invention to solve its technical problems is:

The curved surface turbulence polishing device with a pressure equalizing groove is characterized in that it includes a constraining member, the constraining member is sleeved outside the artificial joint, the inner surface of the constraining member is the same shape as the outer surface of the artificial joint, and the inner surface of the constraining member is the same as the outer surface of the artificial joint. A profiling flow channel with uniform thickness is formed between the outer surfaces of the artificial joint;

There are at least two sets of abrasive grain outlets on the constraining member, the abrasive grain outlets communicate with the profiling flow channel, grooves are formed around the abrasive grain outlets to form pressure equalization grooves, and the pressure equalization grooves are distributed in Constrain the inner surface of the member.

Further, the abrasive particle inflow and outflow inlets are respectively located on both sides of the constraining member, at the inflection point and the singular point on the constraining member surface.

Further, the pressure equalizing grooves are distributed in a cross shape, the pressure equalizing grooves on two adjacent abrasive particle outlets are connected, and the sides of the grooves in the pressure equalizing grooves are inclined.

Further, the abrasive particle inflow and outflow inlet is composed of an outlet and an inlet, and the outlet and inlet are distributed at intervals.

The design ideas and advantages of the present invention are as follows: 1. Through the profiling of the artificial joint curved surface, the local covering curved surface constraining member is established, and the controlled profiling flow channel of the abrasive particle flow is constructed. The processed curved surface becomes a part of the flow channel wall surface, so that the grinding liquid Entering into a fully developed state of turbulent flow, the micro-force and micro-cutting of the surface is realized through the disordered movement of abrasive particles, reaching mirror-level surface roughness and high polishing precision. 2. There are multiple groups of abrasive grain flow inlets and outlets on the restraining member, and the complex curved surface is processed in sections, which avoids uneven polishing caused by abrasive grain flow being resisted at the inflection point or singular point of the curved surface, and the polishing precision is high. 3. There is a pressure equalizing groove around the abrasive particle flow inlet, which can distribute a part of the abrasive particle flow into the pressure equalizing groove, so that the pressure can be evenly distributed to the inner surface of the restraining member, so that the abrasive liquid can evenly fall on the surface of the workpiece, to a certain extent In this way, the uniform processing of the workpiece surface can be realized, and the problem of high-pressure interference at the entrance can be improved to a certain extent. 4. The abrasive particles flow into and out of the inlet, and the outlet and inlet are distributed at intervals, so that the abrasive particle flow in the profiling flow channel flows evenly, the polishing effect is consistent, and the precision is high.

Description of drawings

Fig. 1 is a schematic cross-sectional view of a constraining member of the present invention.

Fig. 2 is a schematic diagram of the distribution of pressure equalizing grooves of the present invention.

Fig. 3 is a three-dimensional schematic view of the constraining member of the present invention.

Detailed ways

Combining Figures 1 to 3, the surface turbulent polishing device with a pressure equalization groove includes a restraint member 1, which is set outside the artificial joint, the inner surface of the restraint member 1 is the same shape as the outer surface of the artificial joint, and the inner surface of the restraint member 1 is the same as the outer surface of the artificial joint. A profiling flow channel with uniform thickness is formed between the outer surfaces of the artificial joint.

There are two inflection points and one singular point on the surface of the artificial joint, that is, the protruding part and the concave part of the artificial joint surface, which are the sudden changes of the curved surface. The abrasive grain inflow and outflow ports are evenly distributed on the constraining member 1, and the abrasive grain inflow and outflow entrances are closely aligned with the profiling The flow channels are connected, and the inlet and outlet of the abrasive grains are composed of outlet 4 and inlet 2. The inlet 2 is provided at both ends of the restraint member 1, and two outlets 4 are provided at the two inflection points of the restraint member 1. The singular points of the restraint member 1 are distributed Four abrasive grain flow inlets, two in the middle are inlet 2, and two on both sides are outlet 4.

Grooves are formed around the abrasive particle flow inlets to form pressure equalization grooves 3. The pressure equalization grooves 3 are distributed on the inner surface of the constraint member 1. The pressure equalization grooves 3 are distributed in a cross shape. The pressure equalization grooves 3 on the two adjacent abrasive particle flow inlets connected.

Claims (4)

1. A curved surface turbulent polishing device with a pressure equalizing groove, characterized in that: it includes a constraining member, the constraining member is set outside the artificial joint, the inner surface of the constraining member has the same shape as the outer surface of the artificial joint, and the inner surface of the constraining member A profiling channel with uniform thickness is formed between the surface and the outer surface of the artificial joint; There are at least two sets of abrasive grain outlets on the constraining member, the abrasive grain outlets communicate with the profiling flow channel, grooves are formed around the abrasive grain outlets to form pressure equalization grooves, and the pressure equalization grooves are distributed in Constrain the inner surface of the member. 2. The curved surface turbulent flow polishing device with a pressure equalizing groove according to claim 1, wherein the abrasive particle inflow and outflow ports are respectively located on both sides of the constraining member, at the inflection point and the singular point on the constraining member surface. 3. The curved surface turbulent polishing device with pressure equalizing grooves as claimed in claim 1, characterized in that: said pressure equalizing grooves are distributed in a cross shape, and the equalizing grooves on the two adjacent abrasive particle flow inlets are connected, so The sides of the groove in the pressure equalizing groove are inclined. 4. The curved surface turbulent polishing device with a pressure equalizing groove according to claim 1, characterized in that: the abrasive particle inflow and outflow inlet is composed of an outlet and an inlet, and the outlet and the inlet are distributed at intervals.

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