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The method of polishing and grinding

12

2023-10

The method of polishing and grinding

Methods of Polishing and Grinding: Grinding involves embedding abrasive particles onto the surface of a grinding tool (hereafter referred to as the "grinding fixture") or coating it with abrasives, along with the addition of a lubricant. Under a certain amount of pressure, the tool and fixture come into contact and move relative to each other, enabling the abrasive particles to remove an extremely thin layer of material from the workpiece's surface. This process ensures that the workpiece achieves precise dimensions, accurate geometric shapes, and exceptionally high surface finish quality. Essentially, free abrasive grains perform minute cutting actions on the workpiece surface through a combination of physical and chemical processes facilitated by the grinding fixture. Key characteristics include: 1. In mechanical grinding, the machine-tool-workpiece system exists in an elastically floating state. 2. The workpiece being ground is not subjected to any external force, allowing it to remain in a free state. 3. The typical speed of grinding motion is below 30 m/min—about one percent of the speed used in conventional grinding. 4. Since only an ultra-thin layer of material is removed during grinding, minimal heat is generated, resulting in reduced machining deformation and a thinner layer of surface alteration. 5. A residual compressive stress remains on the ground surface, which helps enhance the fatigue strength of the workpiece. 6. The process is straightforward and generally does not require complex or expensive equipment. 7. It offers excellent adaptability to various materials and geometries. 8. Grinding can achieve exceptionally low surface roughness levels. --- 1. **Fluid Polishing** Fluid polishing relies on the high-speed flow of a liquid medium carrying abrasive particles to scour the workpiece surface, achieving the desired level of polish. Common methods include abrasive jet machining, liquid jet machining, and fluid dynamic polishing. Among these, fluid dynamic polishing is driven hydraulically, causing the abrasive-laden liquid medium to flow rapidly back and forth across the workpiece surface. The medium typically consists of specialized compounds with excellent flow properties at low pressures, often formulated as polymer-like substances mixed with abrasives—such as silicon carbide powder. --- 2. **Mechanical Polishing** Mechanical polishing is a method that removes protruding areas on the workpiece surface through cutting and plastic deformation, ultimately yielding a smooth, polished finish. It commonly employs tools like oilstones, wool wheels, or sandpaper, often performed manually. For specialized components, such as rotating surfaces, auxiliary tools like rotary tables may be used. For applications demanding exceptionally high surface quality, ultra-precision lapping and polishing techniques are employed. Ultra-precision lapping and polishing utilize specially designed abrasive tools immersed in a polishing compound containing fine abrasives, pressed firmly against the workpiece surface while undergoing high-speed rotational motion. This technique can achieve surface roughness as low as Ra 0.008 μm—making it the most effective among all polishing methods. Optical lens molds frequently rely on this approach. --- 3. **Ultrasonic Polishing** In ultrasonic polishing, the workpiece is placed within an abrasive slurry and subjected to an ultrasonic wave field. The oscillating ultrasonic energy causes the abrasive particles to grind and polish the workpiece surface. Ultrasonic machining generates minimal macroscopic forces, preventing workpiece deformation. However, the setup and installation of the required tooling can be challenging. Ultrasonic machining can also be combined with chemical or electrochemical processes: for instance, after performing chemical etching or electrolytic machining, ultrasonic vibrations are applied to agitate the solution, helping to detach dissolution products from the workpiece surface and ensuring uniform corrosion or electrolysis near the surface. Additionally, the cavitation effect produced by ultrasonic waves in the liquid medium can suppress corrosion, further enhancing surface brightness. --- 4. **Electrolytic Polishing** Electrolytic polishing operates on principles similar to chemical polishing, selectively dissolving the microscopic protruding areas on the material's surface to achieve smoothness. Compared to chemical polishing, this method eliminates the influence of cathodic reactions, leading to superior results. The electrolytic polishing process typically occurs in two stages: (1) **Macro-level leveling**: Dissolved products diffuse into the electrolyte, reducing the overall geometric roughness of the surface, with Ra values exceeding 1 μm. (2) **Micro-level smoothing**: Anodic polarization enhances surface brightness, bringing Ra values below 1 μm. --- 5. **Fluid Polishing** Fluid polishing relies on the high-speed flow of a liquid medium carrying abrasive particles to scour the workpiece surface, achieving the desired level of polish. Common methods include abrasive jet machining, liquid jet machining, and fluid dynamic polishing. Among these, fluid dynamic polishing is driven hydraulically, causing the abrasive-laden liquid medium to flow rapidly back and forth across the workpiece surface. The medium typically consists of specialized compounds with excellent flow properties at low pressures, often formulated as polymer-like substances mixed with abrasives—such as silicon carbide powder. --- 6. **Chemical Polishing** Chemical polishing involves immersing the material in a chemical medium where microscopic protrusions dissolve preferentially over recessed areas, resulting in a smooth surface. One of the primary advantages of this method is its simplicity—it requires no complex equipment, making it ideal for polishing workpieces with intricate shapes. Additionally, chemical polishing allows for the simultaneous treatment of multiple workpieces, significantly boosting efficiency. However, the key challenge lies in formulating the appropriate polishing solution. Typically, the surface roughness achieved through chemical polishing ranges around several micrometers (μm). --- 7. **Magnetic Abrasive Polishing** Magnetic abrasive polishing utilizes magnetic abrasives that form a "brush" under the influence of a magnetic field, enabling precise grinding and finishing of the workpiece. This method boasts high processing efficiency, excellent surface quality, easy-to-control working conditions, and favorable operator safety. With the right choice of abrasive materials, surface roughness can be reduced to as low as Ra 0.1 μm. In the context of plastic mold manufacturing, the concept of "polishing" differs significantly from surface finishing requirements in other industries. Strictly speaking, mold polishing should be referred to as "mirror finishing," as it imposes exceptionally stringent demands not only on the polishing process itself but also on surface flatness, smoothness, and geometric accuracy. Meanwhile, general surface finishing typically focuses solely on achieving a bright, reflective appearance. Mirror finishing standards are classified into four levels: - AO = Ra 0.008 μm - A1 = Ra 0.016 μm - A3 = Ra 0.032 μmA4 = Ra0.063 μm. Since methods like electrolytic polishing and fluid polishing struggle to precisely control the geometric accuracy of parts, and surface quality achieved through techniques such as chemical polishing, ultrasonic polishing, and magnetic abrasive polishing often fails to meet the required standards, mechanical polishing remains the primary method for mirror finishing in precision molds.

2023-10-12

Take you to explore the features of grinding machine products.

11

2023-10

Take you to explore the features of grinding machine products.

Product Features: 1. Equipped with an imported switch featuring overload protection, as well as phase-loss and leakage protection functions. 2. Comes with a vacuum cleaner connection device, ensuring a dust-free working environment. 3. Offers fast rotation speed, enabling long-lasting operation with high grinding efficiency. 4. Can be fitted with an additional 12kg counterweight for effectively polishing old epoxy floors. 5. Allows adjustable control over the depth of floor grinding. 6. Available in four types of diamond grinding discs—extra coarse, coarse, medium, and fine—where the extra-coarse disc is especially ideal for removing old epoxy flooring. 7. Optional combination grinding blocks are available at an affordable price. 8. Features shock-absorbing components crafted from aerospace-grade rubber material, offering flexibility and exceptional durability.

2023-10-11

What does "oL2" mean on the frequency converter display of a floor grinder or concrete grinder? Why won’t the machine start, and how can this issue be resolved?

09

2023-10

What does "oL2" mean on the frequency converter display of a floor grinder or concrete grinder? Why won’t the machine start, and how can this issue be resolved?

Here's the situation: 1. The ground is extremely uneven, creating significant resistance for the grinding disc and placing excessive load on the motor. 2. If this occurs during the first-time use of a new machine, it may indicate that the speed regulator has already been set to its maximum rotational speed. Alternatively, the new grinding discs or plates might not have undergone initial roughing—specifically, they could still be pressed too firmly onto a rough, hard surface, resulting in immense resistance for the grinding disc and overloading the motor. 3. If this issue arises after servicing the gearbox and performing an initial test run, it could mean that the gears were improperly assembled, perhaps tightened too much, causing the grinding disc to rotate unevenly by hand. Another possibility is that, during assembly, the motor was fixed in place before aligning the motor shaft with the central gear, leading to misalignment and uneven rotation. This misalignment can impede the rotor’s movement, causing the motor to stall or "catch." Suggested solutions: 1. Lift the machine slightly and move it to a smoother section of the ground for grinding, then gradually resume working on the particularly uneven areas. Alternatively, use another smaller grinding device to lightly smooth out the rough, pitted sections of the ground before proceeding with your main machine. 2. Roughen the grinding discs directly on a cement surface by applying downward pressure while holding the handlebars. Then, lift the machine slightly off the ground (just enough to disengage the grinding disc from the surface), start the motor, and slowly lower the machine back onto the ground. 3. Disassemble and reassemble the gears or reinstall the motor properly to ensure smooth rotation of both the gears and the grinding disc. Make sure the motor shaft aligns concentrically with the central gear after insertion. Finally, suspend the motor and gearbox assembly, power on the motor, and verify that all components—including the motor, gears, and grinding disc—rotate smoothly. After shutting down, manually check that the grinding disc turns freely without any resistance.

2023-10-09

Metech Multi-Functional Grinder

08

2023-10

Metech Multi-Functional Grinder

The Metechi Multi-Functional Floor Grinder is designed for polishing concrete floors, offering lightweight and flexible operation. It features an integrated grinding and vacuuming system, significantly reducing labor costs by combining grinding and dust collection into one seamless process—allowing you to grind and vacuum simultaneously, thus creating a clean, dust-free working environment. When paired with sandpaper discs, the grinder can also be used to smooth epoxy filler layers, minimizing wear on the epoxy surface while enhancing the overall flatness of the epoxy floor. Additionally, when equipped with a resin drive plate and resin abrasive pads, it’s ideal for grinding and polishing during the application of liquid hardeners. The rubber connector used to attach the grinding disc completely eliminates vibrations that may occur over time due to mechanical wear, ensuring stable and reliable performance throughout extended use.

2023-10-08

MG4P-480 Multi-Functional Floor Grinding Machine

07

2023-10

MG4P-480 Multi-Functional Floor Grinding Machine

The MTQ-branded MG4P-YY-580 Multi-Functional Floor Grinder meets the needs of professional users seeking enhanced efficiency in large-scale industrial floor grinding applications, offering exceptional value for money. It’s ideal for tasks such as grinding and renovating marble, granite, and concrete floors. Product Features: 1. Sleek, modern design that’s both stylish and elegant. 2. Foldable handle with an integrated central control panel, ensuring convenient, safe, and ergonomic operation—plus easy handle movement for added convenience. 3. High-power (7.5 HP) variable-frequency motor designed to withstand the demands of prolonged, heavy-duty industrial floor grinding. 4. Automatic pressure-adjustment control system, tailored to meet the requirements of various construction processes. 5. Optional dust extraction system available, enabling seamless switching between dry and wet working modes. 6. Twist-style water-release switch paired with a central water-dispensing system on the grinding disc, effectively minimizing secondary wear of abrasive materials and preventing unsightly grinding marks during operation—boosting productivity significantly. 7. Versatile grinding discs compatible with a wide range of abrasive materials, helping you cut down on your overall project costs. For more information, please call Guangzhou Qingqinyu Environmental Technology Co., Ltd. We’re here to serve you with our utmost dedication! [Visit us online at](http://www.qingqinyu.com)

2023-10-07

How can you determine whether the gears of a floor grinding machine are functioning properly?

27

2023-09

How can you determine whether the gears of a floor grinding machine are functioning properly?

In floor grinding operations, the floor grinder is an essential piece of equipment. After prolonged use, operators may encounter certain malfunctions—among which gear rotation issues are particularly critical. So, how can you determine whether the gears in your floor grinder are functioning properly? 1. Listen carefully: A well-made floor grinder should operate with noise levels comparable to those of belt-driven systems. 2. Examine the materials: High-quality machines prioritize efficient heat dissipation during dry grinding, which is why they often opt for aluminum alloy components. 3. Check the precision of gear meshing clearance: Manually rotate the grinding disc to assess the fit and ensure smooth operation. 4. Consider durability: The longevity of the grinder is closely tied to its housing design. After selecting the appropriate housing material, evaluate the weight of the grinding head itself. If you’re interested in Metengqi products, feel free to contact our service hotline at 13925069066 for more information!

2023-09-27

What are the performance differences between epoxy flooring and cured flooring?

27

2023-09

What are the performance differences between epoxy flooring and cured flooring?

Here's the translation: --- The performance comparison between epoxy flooring and hardened concrete flooring is as follows: 1. **Mechanical Performance Comparison**: Overall, epoxy flooring significantly outperforms hardened concrete flooring in terms of mechanical properties. It has inferior wear resistance, compressive strength, and impact resistance. In environments with high-intensity operations, epoxy floors are prone to peeling, scratching, and other surface issues. Additionally, black marks left by forklifts can be particularly difficult to remove. In contrast, hardened concrete flooring excels in mechanical durability, boasting a Mohs hardness rating as high as 7 to 8. This makes it virtually impervious to most impacts and heavy rolling loads, ensuring that even common industrial vehicles like trailers and forklifts leave no trace—no scratches or tire marks—on the hardened surface. 2. **Chemical Performance Comparison**: Epoxy flooring exhibits excellent chemical stability, making it one of the most effective barrier materials available. It provides long-lasting protection against water, acids, alkalis, gasoline, lubricants, and other corrosive substances. While hardened concrete flooring also offers strong chemical resistance, its ability to block off contaminants like water, acids, alkalis, oils, juices, stains, and algae is slightly weaker compared to epoxy. However, acidic substances still need prompt cleaning, as prolonged exposure may lead to visible marks over time. 3. **Waterproofing, Moisture Resistance, and Seepage Prevention**: Thanks to its robust barrier properties, epoxy flooring delivers outstanding waterproofing, moisture resistance, and seepage prevention, making it a superior choice for traditional waterproof flooring applications. That said, once scratched, its waterproof capabilities will sharply decline. On the other hand, hardened concrete flooring isn’t technically classified as a waterproof material, yet it still boasts impressive moisture-proof and seepage-resistant qualities. Industry standards often measure its waterproofing ability using the 24-hour penetration reduction test, and data from such tests clearly demonstrate its remarkable water-repellent performance. 4. **Aesthetic Appeal**: Epoxy flooring utilizes epoxy resin—a paint-like material—resulting in a glossy, highly reflective finish that exudes a sleek, polished look. In contrast, hardened concrete flooring incorporates advanced polishing techniques, creating a striking mirror-like surface that conveys a solid, durable aesthetic. 5. **Safety Comparison**: In terms of environmental safety, hardened concrete flooring is made from non-toxic, water-based inorganic materials, making it entirely safe for residential use without any health concerns. Meanwhile, while epoxy resin itself is non-toxic, the curing agents used alongside it—including carcinogenic compounds like MDA, TDI, and MDI—are hazardous and can linger within the epoxy coating, gradually releasing harmful fumes over time. Regarding fire safety, hardened concrete flooring achieves the highest fire-resistance rating—Class A1—making it highly resistant to flames under extreme conditions. In contrast, epoxy flooring lacks inherent fire-retardant properties and can easily ignite when exposed to high temperatures. As for static electricity control, certain specialized types of epoxy flooring—such as anti-static epoxy resins—can effectively prevent static buildup. However, hardened concrete flooring, when properly installed without additional epoxy coatings, can achieve antistatic properties simply through the application of conductive cement mortars during construction. 6. **Service Life**: The saying "it’s a double-edged sword" perfectly captures the trade-off in epoxy flooring: while its exceptional barrier properties make it incredibly durable, this same characteristic ultimately limits its longevity due to poor breathability. Rising groundwater vapor beneath the floor can easily cause bubbling, cracking, and delamination in epoxy systems. Typically, epoxy flooring lasts only 2 to 3 years, though lower-quality versions may degrade even faster, leading to higher replacement costs. In stark contrast, hardened concrete flooring boasts an impressively long service life of 20 to 30 years—or even longer under optimal maintenance conditions. In fact, with proper care, its lifespan can approach a near-permanent level, aligning seamlessly with the overall lifecycle of the building itself.

2023-09-27

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