RU2359807C1 - Device for feeding of solid lubricant on grinding wheel - Google Patents

Abstract

FIELD: mechanical engineering.

SUBSTANCE: invention relates to mechanical engineering field and can be used while processing of machine elements blanks by means of cutting with feeding of solid lubricant (SL) on grinding wheel. Device contains tank for SL and installed in its bottom part thermal element. With tank and thermal element it is connected temperature control device of SL. Inside the tank case it is located mixer. There are provided nozzle, electrically insulated from the tank and mixer and also device of compressed air preparation, control unit and pipeline system. Nozzle is connected to mixer by means of flexible tubing made of dielectric material. The latter is located inside the flexible thermal element, connected to electric circuit for heating of flexible tubing up to the temperature, exceeding SL melting temperature.

EFFECT: consequently it is provided the ability of SL feeding in restricted conditions, for instance at inner grinding and application of this invention in cases when it can be located in working area at required distance and on the required mitre.

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Description

The invention relates to the field of engineering, and in particular to the processing of workpieces of machine parts by cutting using grinding wheels (HK), solid and plastic cutting lubricants (COTS).

A device for cooling and lubricating the cutting zone with sprayed liquids (USSR AS No. 152162, IPC B24b, publ. 05.05.66, BI No. 23), including an emulsion tank, distributor, mixer, piping system, pipe nozzle and device to regulate the supply of compressed air, in which dry air and the droplet mixture are directed along separate lines to a mixer, which is as close as possible to the cutting zone, where they are mixed and sent through the nozzle to the treatment zone, which ensures stable operation and constant spray flow the liquid to be.

A device is known for finely atomized cooling and ventilation for grinding machines during diamond grinding and fine-tuning of carbide cutting tools (USSR AS No. 222189, IPC B24b, publ. 17.07.68, BI No. 22), including an emulsion jet atomizer and a ventilation unit, in in which a sprayed emulsion stream under high pressure is ejected from the nozzle into the cutting zone, where it cools the barcode and the sharpened tool.

Known installations for cooling and lubricating the cutting zone with sprayed liquids, including oil ones, such as UR-3 and UZ-ZA (see Khudobin L.V. Technique for the use of cutting lubricants in metalworking / L.V. Khudobin, E.G. . Berdichevsky. - M.: Mashinostroenie, 1977. - P.104, Fig. 64), built on a single principle and including: a device for preparing air, consisting of an air cleaner and a pressure reducing valve; automation device consisting of an air distributor with mechanical or electrical control; a spray device comprising a tank, a mixer and a nozzle for forming and directing jets of this mixture into the cutting zone; transporting elements. The advantage of these devices is a very low coolant consumption (up to 10 g / min water and 0.1 g / min oil), which eliminates the need for collection, cleaning and decomposition of spent coolant. This significantly affects the decrease in the share of coolant costs in the cost of production.

A device for supplying cutting fluid (coolant) when working on turning, milling, planing and other machines (RF patent No. 2049654 C1, IPC6 V24V 55/02, publ. 12.10.95, BI No. 34), containing a reservoir for coolant , a high-pressure pump, internally divided by an elastic membrane into low-pressure compartments (for supplying coolant) and a high pressure for supplying working fluid, a piping system and a nozzle for supplying fluid to the treatment zone, which improves the efficiency of the coolant supply by increasing the reliability and durability of the pump in high pressure.

The disadvantages of the analogs described above are that they are designed for spraying or high-pressure supply of COTS, which are only in the liquid state of aggregation, their use in grinding operations does not significantly increase the stability of the barcode and thereby reduce their consumption due to the presence of powerful boundary air flow.

The closest device of the same purpose to the claimed invention in terms of features is a device for supplying solid lubricant (TCM) to a barcode (RF patent No. 2238842 C1, IPC7 V24V 55/02, publ. 10.27.04, BI No. 30), including a tank for TCM, a thermal element installed in the lower part of the tank for TCM, a temperature control device for TCM connected to the tank for TCM and a thermal element, the mixer is located inside the tank for TCM, a nozzle electrically isolated from the tank for TCM and the mixer and included in the electrical circuit , a compressed air preparation device, a control device and a piping system adopted as a prototype.

The reasons that impede the achievement of the technical result indicated below when using a known device adopted as a prototype include the fact that the known device does not allow FCM to be supplied to the barcode in cramped conditions, for example, when grinding inside, when the barcode is only partially removed from the hole to be processed to its length overrun or when the processing equipment does not allow to place the installation for applying molten FCM in the working area at the required distance from the barcode and at the required angle.

The invention consists in the following. The recent sharp increase in the requirements for the competitiveness of engineering products has made the problem of improving the quality of the surfaces of workpieces of machine parts processed during grinding operations particularly urgent. One way to solve this problem is to rationalize the use of SOTS.

The technical result is an increase in the quality of the surfaces of machine parts and a decrease in the share of costs for SOTS in the cost of production.

The specified technical result during the implementation of the invention is achieved by the fact that the claimed device, like the known device, consists of a tank for TCM, a thermal element installed in the lower part of the tank for TCM, a temperature control device for TCM associated with the tank for TCM and a thermal element, a mixer located inside the tank for TCM, a nozzle electrically isolated from the tank for TCM and a mixer and included in the electrical circuit, compressed air preparation device, control device and pipe system wires.

The peculiarity lies in the fact that the nozzle is connected to the tank for TCM by a flexible tube made of a dielectric located inside the heating element, which is thermally insulated from the environment by a moisture-proof material, a nozzle is installed at the end of the tube. Voltage is applied to the heating element, and the tube is heated to a temperature above the melting point of the TCM used.

A long electrically insulated tube allows transporting the TCM heated in the tank in a sprayed state. The heated airborne mixture is fully transported through the tube-nozzle to the working surface of the barcode and creates a uniform quickly solidifying TCM layer on it. In this case, the formation of a growth in the tube-nozzle from the frozen TCM is excluded. The TCM layer reliably protects abrasive grains from direct contact with the material of the workpiece. This helps to reduce the friction force, and consequently, the heat-stress intensity in the processing zone, as a result of which the surface quality of the machined workpieces of machine parts increases. The use of a flexible tube connecting the nozzle to the mixer makes it possible to install the entire device in a place convenient for its placement on the table, regardless of the angle of inclination of the nozzle relative to the axis of the rotating barcode.

Information confirming the possibility of carrying out the invention with obtaining the above technical result

The drawings show: FIG. 1 is a diagram of a device for supplying FCM to a grinding wheel; figure 2 - diagram of the application of TCM with the location of the nozzle at an angle to the axis of the rotating bar.

A device for supplying FCM to the CC (Fig. 1) comprises a compressed air preparation device, including a valve (valve) 1, a filter-moisture separator 2, an air distributor (control device) 3, a pressure reducing valve 4, and a pressure gauge 5; potentiometer 6, tank for TCM 7, mixer 8, dielectric gasket 9, tube for supplying molten TCM 10 to the mixer, flexible tube of dielectric material 11, flexible heat element 12, flexible shell of heat-insulating moisture-proof material 13, nozzle 14 (hereinafter, position 11 , 12, 13 and 14 are combined under the general name - tube-nozzle), switch 15, temperature sensor 16, thermal element 17 and piping system 18. The thermal element 17 is installed in the lower part of the tank for TCM 7 and connected to a potentiometer 6, which, in turn with It is connected to a temperature sensor 16 mounted on the tank body for TCM 7. The tube-nozzle is isolated from the tank for TCM 7 by a dielectric gasket 9 and is included in the electric circuit. The housing of the mixer 8 is located in the tank for TCM 7.

The operation of the device is as follows.

Before starting work on a grinding machine, a TCM (for example, paraffin) is placed in the tank for TCM 7, for example, voltage is applied to the thermal element 17 and the TCM is melted, turning it into a liquid state of aggregation. Upon reaching a predetermined temperature, for example, for paraffin, _tmelt = 54 ° C (see Kuhling X. Handbook of Physics. - M .: Mir, 1983. - P.465), potentiometer 6 disconnects the voltage on the thermal element 17 and then periodically connects it when the temperature of the molten TCM drops below a predetermined value. The temperature is monitored using a sensor 16. After the TCM enters the liquid state of aggregation, voltage is supplied through the switch 15 to the heating element 12 and the nozzle tube is heated to a temperature above the melting point of the used TCM. Then, compressed air is supplied from the factory pneumatic network under a pressure of 0.2 ... 0.4 MPa, which, having passed through a valve 1, a filter-moisture separator 2, an air distributor 3, a pressure reducing valve 4 and a piping system 18, enters the mixer 8. Since the mixer body 8 is located inside the tank with TCM 7, then the compressed air passing through the mixer 8 is heated to the temperature of the molten TCM and at the outlet of the mixer body 8 is mixed with the molten TCM entering the mixer 8 from the tank for TCM 7 through a tube for supplying the molten TCM to the mixer 10. When mixed and heated air with molten TCM in a liquid state of aggregation, an air-drop mixture is formed, which is fully transported (without the formation of a buildup of TCM in the mixer 8) through the heated tube-nozzle (also preventing premature freezing of the air-drop mixture) to the working surface grinding wheel 19 and creates a uniform uniform layer of TCM on it. The duration of application and, accordingly, the thickness of the TCM layer on the grinding wheel 19 is determined by the specific grinding conditions. The TCM layer reliably protects abrasive grains from direct contact with the material of the workpiece, which helps to reduce heat generation in the processing zone and improve the quality of the machined surfaces of machine parts.

Claims (1)

A device for supplying solid lubricant (TCM) to a grinding wheel containing a tank for TCM, a thermal element installed in its lower part, a temperature control device for TCM connected to the tank and the thermal element, a mixer located inside the tank body, a nozzle electrically isolated from a tank and a mixer and included in the electrical circuit, a compressed air preparation device, a control device and a piping system, characterized in that the nozzle is connected to the mixer by means of a flexible tube from a dielectric material located inside a flexible thermal element, which is included in the electric circuit with the possibility of heating the flexible tube to a temperature exceeding the melting point of TCM.

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