阅读说明：本技术 一种用于体育运动器材减阻的复合沟槽结构及激光加工方法 (Composite groove structure for drag reduction of sports equipment and laser processing method ) 是由 管迎春 王政森 于 2019-10-30 设计创作，主要内容包括：本发明主要涉及一种用于体育运动器材减阻的复合沟槽结构及激光加工方法。设计不同周期的复合沟槽结构并利用超快激光加工技术在运动器材的金属表面进行加工,该加工方法具有加工效率高、操作简单、使用范围广、精度高等优点。复合沟槽结构可使得气流流过金属表面时,通过复合沟槽结构对气流的引导减少其对运动器材的阻力,从而减少运动员的体能损耗。(The invention mainly relates to a composite groove structure for drag reduction of sports equipment and a laser processing method. The processing method has the advantages of high processing efficiency, simple operation, wide application range, high precision and the like. The composite groove structure can lead the airflow to be guided by the composite groove structure when the airflow flows through the metal surface, so that the resistance of the airflow to the sports equipment is reduced, and the physical loss of athletes is reduced.)

1. A composite groove structure for drag reduction of sports equipment and a laser processing method comprise the following steps:

selecting a metal material for preparing a surface groove structure;

secondly, grinding and polishing the surface of the metal material to be processed by the laser by using a mechanical grinding method, and then ultrasonically cleaning and drying the polished metal sample by using absolute ethyl alcohol;

designing a groove structure to be processed on the metal surface by using ultrafast laser, and setting a laser scanning path;

step four, setting laser process parameters;

placing a metal sample piece to be processed on a laser precision processing platform, adjusting a laser beam to enable the focus of the laser beam to be located on the surface of the metal sample piece, and then processing the metal sample piece;

and step six, putting the metal sample piece processed by the laser into absolute ethyl alcohol for ultrasonic cleaning and drying to obtain the surface resistance-reducing groove structure of the metal material.

2. The composite groove structure and laser processing method for drag reduction of sports equipment as claimed in claim 1, wherein: the metal material is conventional light weight metal material, including steel, magnesium and magnesium alloy, titanium and titanium alloy, etc.

3. The composite groove structure and laser processing method for drag reduction of sports equipment as claimed in claim 1, wherein: the composite groove structure is formed by periodically arranging two types of grooves (hereinafter referred to as type A grooves and type B grooves); one to five B-type grooves are uniformly distributed between every two A-type grooves; the A-type grooves and the B-type grooves are arranged in parallel, and the width of the A-type grooves is larger than that of the B-type grooves; the interval between the adjacent A-type grooves and the B-type grooves is less than or equal to the width of the second groove, and the interval between the two adjacent B-type grooves is less than or equal to the width of the B-type grooves. Width omega of A-type groove₁0.50 mm-0.85 mm, depth d₁Less than or equal to 0.508 mm; width omega of B-type groove₂0.10 mm-0.50 mm, depth d of B-type groove₂Less than or equal to 0.3 mm. Interval omega between two adjacent B-type grooves₃≤ω₂The interval between adjacent A-type groove and B-type groove is omega₄≤ω₂。

4. The composite groove structure and laser processing method for drag reduction of sports equipment as claimed in claim 1, wherein:

the A-type groove is processed by using laser with the pulse width of 0.2-100 ps, the laser wavelength of 200-1100 nm, the repetition frequency of 50-500 kHz, the output power of 3-15W, the scanning speed of 10-4000 mm/s and the processing times of 1-400 times.

The B-type groove is processed by using laser with the pulse width of 0.2-100 ps, the laser wavelength of 200-1100 nm, the repetition frequency of 50-500 kHz, the output power of 1-10W, the scanning speed of 500-5000 mm/s and the processing times of 1-200.

5. The composite groove structure and laser processing method for drag reduction of sports equipment as claimed in claim 1, wherein: in the fluid resistance simulation process, ANSYS CFX 19.0 finite element analysis software was used.

6. The composite groove structure and laser processing method for drag reduction of sports equipment as claimed in claim 1, wherein: the resistance reduction rate of the novel resistance reduction groove structure prepared on the metal surface by the ultrafast laser can reach 40%.

Technical Field

The invention relates to the field of drag reduction, in particular to a composite groove structure for drag reduction of sports equipment and a laser processing method.

Background

When a player swings a metal club or a metal racket such as a golf club, physical strength consumption is increased and swing strength is decreased due to resistance generated by airflow, thereby affecting game performance. The groove drag reduction technology has the advantages of wide application, low cost, simple operation and the like, and can be used on the surface of the striking face to achieve the effect of reducing the air flow resistance. In view of this, the embodiment of the present invention provides a composite groove structure and a laser processing method for drag reduction of sports equipment, which can enable airflow to flow backwards after being guided to the edge of the striking face through the drag reduction groove on the striking face when a player swings a club, thereby effectively reducing airflow resistance generated when the player swings the club; and the ultrafast laser processing also has the characteristics of high processing precision, high efficiency, simple operation and the like.

Disclosure of Invention

The invention aims to provide a composite groove structure for drag reduction of sports equipment and a laser processing method, which comprises the following steps:

the composite groove structure is prepared on the surface of metal by using ultrafast laser, and the structure consists of A-type and B-type grooves which are periodically arranged. One to five B-type grooves are uniformly distributed between every two A-type grooves; the A-type grooves and the B-type grooves are arranged in parallel, and the width of the A-type grooves is larger than that of the B-type grooves; the interval between the adjacent A-type grooves and the B-type grooves is less than or equal to the width of the second groove, and the interval between the two adjacent B-type grooves is less than or equal to the width of the B-type grooves.

Drawings

Various aspects of the invention are better understood from the following detailed description when read in conjunction with the accompanying drawings.

FIG. 1 is a schematic diagram of a drag reducing groove and a partial cross-sectional view of a drag reducing groove of an embodiment of the present invention.

FIG. 2 is a diagram of an embodiment of the present invention and a light mirror thereof.

Fig. 3 is a simulation result diagram before machining and a simulation result diagram of the example of fig. 2.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments, but not all embodiments, of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1, in the embodiment of the present invention, there are a plurality of parallel grooves, including a type a groove and a type B groove. The processing of the groove structure adopts an ultrafast laser processing technology, and the processing method is simple to operate and high in processing precision.

Selecting a metal material for preparing a surface groove structure, and selecting a common light metal material which is well known and used in the field of sports equipment and comprises steel, magnesium and magnesium alloy, titanium and titanium alloy and the like as a processing material.

Secondly, grinding and polishing the surface of the metal material to be processed by the laser by using a mechanical grinding method, and then ultrasonically cleaning and drying the polished metal sample by using absolute ethyl alcohol;

step three, forming equally spaced type a grooves on the processing surface by using ultrafast laser, referring to fig. 1, the width ω of the type a grooves₁0.50 mm-0.85 mm, depth d₁Less than or equal to 0.508 mm; the A-type groove processing uses laser pulse width of 0.2-100 ps, laser wavelength of 200-1100 nm, repetition frequency of 50-500 kHz, output power of 3-15W, scanning speed of 10-4000 mm/s, and processing times of 1-400 times.

Step four: the ultrafast laser is used to process the surface to form equally spaced B-type grooves, and one to five B-type grooves are uniformly distributed between every two a-type grooves, please refer to fig. 1, in which three B-type grooves are selected to be processed equally spaced between every two adjacent a-type grooves. Width omega of B-type groove₂0.10 mm-0.50 mm, depth d of B-type groove₂Less than or equal to 0.3 mm. Interval omega between two adjacent B-type grooves₃≤ω₂The interval between adjacent A-type groove and B-type groove is omega₄≤ω₂. The B-type groove is processed by using laser with the pulse width of 0.2-100 ps, the laser wavelength of 200-1100 nm, the repetition frequency of 50-500 kHz, the output power of 1-10W, the scanning speed of 500-5000 mm/s and the processing times of 1-200.

The execution sequence of steps three and four is not limited.

Step five: and (3) putting the metal sample piece subjected to laser processing into absolute ethyl alcohol for ultrasonic cleaning and drying to obtain the surface resistance-reducing groove structure of the metal material.

Referring to fig. 2, a diagram of an embodiment of the present invention includes:

the material of the processing sample piece is titanium alloy.

Groove width omega of A-type groove₁About 0.738mm, depth d₁0.32 mm; groove width omega of B-type groove₂0.336mm, depth d₂0.116 mm; three B-type grooves are machined between every two adjacent A-type grooves at equal intervals, and the interval omega between every two adjacent B-type grooves₃0.30mm, and the interval between adjacent A-type grooves and B-type grooves is omega₄Is 0.30 mm.

The laser parameters for processing the A-type groove are as follows: the pulse width is 0.2ps, the laser wavelength is 1026nm, the repetition frequency is 100kHz, the output power is 10W, the scanning speed is 500mm/s, and the processing times are 200 times.

The laser parameters for processing the B-type groove are as follows: the pulse width is 0.2ps, the laser wavelength is 1026nm, the repetition frequency is 100kHz, the output power is 5W, the scanning speed is 500mm/s, and the processing times are 200 times.

Fig. 3 is a diagram of simulation results before machining and the above example. The drag reduction rate of the example can be calculated to be 32% according to the drag coefficient formula.

Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope defined by the appended claims.