36results about How to "Avoid Grinding Burns" patented technology

The invention discloses an impregnant for impregnated grinding wheels and application thereof in preparing the impregnated grinding wheels. The impregnant is prepared from a solid lubricant, surfactants, dispersants, anti-adhesion addictives and water, wherein the solid lubricants are molybdenum disulfide and paraffin; the surfactants are oleic acid and triethanolamine; the dispersants are sodiumchloride and sodium carbonate; and the anti-adhesion addictives are sodium molybdate and tributyl phosphate. The impregnant is used for preparing the impregnated grinding wheels, and the prepared impregnated grinding wheels have the advantages of improving the grinding state and reducing grinding burn.

The invention relates to a self-adaptive control method of spherical numerical-control precision grinding process in the technical field of automatic control, comprising the steps of: collecting a current value of a driving motor in the grinding process and setting the current value as a processing current threshold; detecting a current value of a grinding wheel driving motor by taking once circulatory feeding of a grinding wheel frame as a detection period during the processing; and solving the average value of the currents according to continuous 5-minute current values of the grinding wheel driving motor and carrying out optimization judgment. In the invention, through detecting the current of the grinding wheel driving motor and controlling the grinding feeding depth (feeding amount)in the rotary spherical grinding process of a high-hardness material, the current of the grinding wheel driving motor is kept at a proper value all the time, namely, the feeding depth (feeding amount) of the grinding wheel frame is basically consistent with the removal rate of the workpiece material during the grinding of the grinding wheel, thereby achieving efficient and stable grinding effect.

The invention relates to a process and a device for forming a micro-bulge oil film on a surface of a workpiece under nano particle jet flow condition. According to the process, the action that the nano particle jet flow micro lubrication is coupled with the a micro-bulge on the surface of the workpiece is utilized, a nano fluid is ejected to a grinding area in a higher speed under the action of compressed air, so as to form the lubrication oil film on the surface of the workpiece with the micro-bulge, thereby cooling and lubricating the grinding machining area to the maximum extent. The nano particles are adhered to the rough surface of the workpiece and have stronger cooling performance and excellent friction characteristics, so that the grinding burn is effectively solved, the surface of the workpiece is good in quality, and low-carbon, green and cleaning production with high efficiency, low consumption, environmental friendliness and resource conservation is realized. The device comprises a nano fluid supply device and a compressed air supply device, wherein the two devices are respectively connected with a nozzle through a nano fluid conveying pipe and a compressed air conveying pipe; a set distance d and an included angle alpha are maintained between the nozzle and the workpiece with the micro-bulge surface; and the nano fluid supply device and the compressed air supply device are connected with a control device.

The invention discloses a grinding wheel with internal cooling. The grinding wheel body is a bowl-shaped structure. There is a knife handle on the grinding wheel body. Abrasive grains are uniformly distributed under the cavity wall of the grinding wheel body. The coolant cavity is sealed by a circular plate, and there is a coolant injection hole on the circular plate; the tool handle is provided with a central through hole, and the central through hole leads into the central cavity of the grinding wheel body; uniformly distributed in the cavity wall of the grinding wheel body There is a cooling liquid channel; the entrance of the cooling liquid channel is located in the cooling liquid chamber of the grinding wheel body, and the injection port of the cooling liquid channel is located between two adjacent abrasive grains. The advantages of the present invention are as follows: the cooling liquid is passed through the injection hole through the supercharging device, and the cooling liquid is ejected from the middle of two adjacent abrasive grains by using the pressure, gravity and the centrifugal force of the grinding wheel rotation, which can significantly reduce the temperature of the grinding area. It is a practical and effective grinding tool to avoid grinding burns and achieve more sufficient cooling.

The invention relates to a magnetic nanoparticle jet flow and magnetic force working table coupling oil film forming process and a magnetic nanoparticle jet flow and magnetic force working table coupling oil film forming device. The magnetic nanoparticle jet flow and magnetic force working table coupling oil film forming device includes a magnetic force working table onto which a work piece is attached; a grinding wheel is arranged on the processing position of the work piece, a nozzle is arranged on the position of the grinding wheel cover, and the position of the grinding wheel cover is matched with the work piece; the nozzle is connected with a magnetic nanofluid liquid supply device through a magnetic nanofluid delivery pipe, and connected with an air compressor through an air compressor delivery pipe; the magnetic nanofluid and compressed air formed into a three-phase flow spray after being mixed and accelerated in the nozzle, wherein the three-phase flow spray is a mixed spray of the compressed air, the magnetic nanoparticles and grinding-fluid-based oil particles; and the three-phase flow spray enters the grinding area between the work piece and the grinding wheel, the magnetic force working table is in magnetic coupling with the three-phase flow spray, and an oil film is formed on the surface of the work piece. The magnetic nanoparticle jet flow and magnetic force working table coupling oil film forming device delivers the magnetic nanoparticle fluid to the nozzle and forms a lubricating oil film on the surface of the work piece of the magnetic worktable, so that the maximum cooling and lubricating of a grinding processing area is achieved.

Provided is a gear grinding method wherein an initial cutting position by a grindstone is appropriately set, resulting in an improvement being able to be made in machining accuracy. For this purpose, the gear grinding method is such that rotation of a workpiece (W) about a workpiece rotation axis (C), cutting by a grindstone (15) in the X-axis direction, and feeding of the grindstone (15) in the Z-axis direction are controlled, resulting in the workpiece (W) being ground by the grindstone (15). In this method, measurement points (P1 - P9) are set in a grid-like pattern on a left tooth surface (WL) and a right tooth surface (WR) of a predetermined tooth (Wa) of the workpiece (W); rotation phases about the workpiece rotation axis (C) at the measurement points (P1 - P9) are detected; tooth thickness deviation amounts (e) between a reference involute tooth surface and the measurement points (P1 - P9) on the left and right tooth surfaces, as well as tooth thickness deviation amounts (e) between the involute tooth surface and corresponding points (Q1 - Q9) on all teeth other than the tooth (Wa), are obtained on the basis of the detected rotation phases; and an initial cutting position (X1) for the grindstone (15) is set on the basis of the largest of the deviation amounts (e) .

The invention discloses a tangential self-excited vibration auxiliary dry grinding system and method. A grinding head system is mounted on a self-excited vibration plate. The self-excited vibration plate is fixed to a machine tool body through a cantilever. During machining, a grinding wheel of the grinding head system rotates to serve as an excitation source of the whole system, energy is input to the self-excited vibration plate, and the self-excited vibration plate drives the grinding head system to subjected to self-excited vibration, so that abrasive grains of the grinding wheel are made to make reciprocating componential movement at a certain frequency in the tangential direction of the grinding wheel relative to a workpiece while grinding the workpiece. By controlling the rotating speed of the grinding wheel, the quantity of input self-excited vibration energy can be adjusted; by analyzing and designing the inherent frequency and modal of the self-excited vibration plate, the frequency of a self-excited vibration system can be controlled; and the abrasive grains of the grinding wheel make contact with or are separated from the workpiece periodically, so that grinding heat is effectively dissipated, and the purposes of decreasing the grinding temperature and avoiding grinding burns are achieved.

The invention discloses a parameter design method of a tooth profile grinding temperature uniform macrostructure forming grinding wheel, which is characterized in that a groove whose width varies according to a certain rule from the bottom to the top is designed on the working surface of the forming grinding wheel. The process of determining the change law of the groove width is as follows: establish an analytical model of the intermittent grinding temperature field of the grooved grinding wheel; establish a correlation model of grinding parameters, groove width and grinding temperature through multiple nonlinear regression analysis; combine the gear forming grinding Based on the geometric relationship of the grinding contact, the relationship model between the groove width of the grinding wheel and the grinding parameters, the geometric size of the gear and the contact position is established. According to the derived relationship model, the groove width at any position of the grinding wheel is calculated to determine the macroscopic structure of the grinding wheel working face. Compared with the existing continuous forming grinding wheel, the grinding wheel of the invention is beneficial to solve the problem that the gear forming grinding temperature is concentrated on the top of the teeth, prevent grinding burns and ensure the grinding quality.

The invention relates to a method for softening the carburized region of gear steel after carburizing. After high-temperature austenitization, oil quenching and stress relief treatment, the Ms point of the carburized layer structure is greatly reduced, and the hardness of the material may be reduced to HRC28. Between ~35, gear shaping, gear hobbing or finishing turning can be performed. After the material is softened by the invention, the grinding process can be replaced, the occurrence of grinding burns can be effectively avoided, and the production efficiency can be improved.

The invention discloses an expander-driven refrigeration low-temperature cooling nanoparticle jet micro-lubrication supply system, comprising a low-temperature gas generating device, the low-temperature gas generating device is connected to a nano-fluid micro-lubrication supply system after being decelerated by a harmonic gear reducer, and the low-temperature gas The generating device is connected with the gas distribution control valve, the nanofluid micro-lubrication supply system is also connected with the external mixing nozzle, and the gas distribution control valve is used to control the gas flow; the system device can effectively reduce the thermal damage of grinding and improve the efficiency of the grinding process. The surface integrity and machining accuracy of the machined workpiece have stronger cooling performance and excellent tribological characteristics, and the surface can realize low-carbon green and clean production with high efficiency, low consumption, environmental friendliness and resource saving.