RU235164U1 - PRISMATIC COMPOSITE CARBON KEY - Google Patents

Abstract

The utility model relates to devices for connecting structures made of composite material and concerns a prismatic composite carbon key. The key includes a body of a rectangular prism with roundings along the edges of the long side in the form of a semi-cylinder. The body roundings are rolled from a heated blank, the body of the key is made of a composite material consisting of a carbon fiber base in the form of fiber impregnated with a binding epoxy resin with the addition of diamond powder, preliminarily uniformly mixed in the resin. The technical result consists in increasing the surface resistance, increasing the wear resistance of the key. 2 ill.

Description

The utility model relates to devices for connecting structures made of composite material and can be used in assembling structures. Composite mechanical transmissions have enormous advantages in the form of specific gravity of the material for products that are in demand in aerospace engineering.

State of the art

A device is known - a prismatic key made of basalt composite material (patent RU 226105, IPC F16B 3/00. Published: 21.05.2024 Bulletin No. 15), containing a body of a rectangular prism with roundings in the form of a semi-cylinder, wherein the body of the key is made of basalt composite material, including a basalt base in the form of fiber impregnated with binding resins, the roundings of the body are rolled from a heated blank, and the basalt base in the form of fiber impregnated with binding resins is made with the addition of basalt powder, pre-mixed in resin.

The disadvantage of the known device is the low stability of the keyway connection made of epoxy hybrid composites.

The closest known device is a prismatic key made of a composite hybrid fiberglass material (patent RU 226243, IPC F16B 3/00. Published: 05/28/2024 Bulletin No. 16), containing a rectangular prism body with roundings in the form of semi-cylinders, wherein the key body is made of a fiberglass composite material including a fiberglass base in the form of fiber impregnated with binder resins, the roundings of the body are rolled with a heated workpiece, and the fiberglass base of the key in the form of fiber impregnated with binder resins is made with the addition of quartz powder, preliminarily uniformly mixed in the resin.

The disadvantage of the closest device is the low stability of the keyway connection made of epoxy hybrid composites.

Disclosure of a utility model

The technical result is an increase in surface stability, increasing the wear resistance of the key, due to the use of hybrid epoxy composites.

The present technical result is achieved in a device - a prismatic composite carbon key, including a body of a rectangular prism with roundings along the edges of the long side in the form of a semi-cylinder, wherein the body of the key is made of a composite material consisting of a carbon-plastic base in the form of a fiber impregnated with a binding epoxy resin, the roundings of the body are rolled from a heated blank, wherein the carbon-plastic base in the form of a fiber impregnated with a binding resin is made with the addition of diamond powder, previously uniformly mixed in the resin.

The distinctive features are:

carbon fiber base impregnated with a binder resin, made with the addition of diamond powder, this increases the stability and surface strength of the keyway joint due to the rigidity of epoxy composites [3];

Preliminary uniform mixing with diamond powder allows to increase the stability and surface strength of the keyway connection due to the rigidity of hybrid epoxy composites [4].

A comparison of the claimed solution with an analogue and prototype did not reveal any features that distinguish the claimed solution, which allows us to conclude that it meets the “novelty” criterion.

Brief description of the figure

Fig. 1 shows an isometric view of the device of a prismatic composite carbon key, including: 1 - the body of the key; 2 - rounding of the body by a semi-cylinder; 3 - the supporting working surface of the key.

Fig. 2 shows a local section A from Fig. 1, including: 2 - rounding of the key body into a semi-cylinder; 4 - diamond powder; 5 - roving threads deformed during the stamping process; 6 - roving threads formed in the required order.

Implementation of a utility model

The main raw material for the production of carbon fiber dowels is carbon fiber roving. In addition, the following is required to produce a composite dowel: resins; ethyl alcohol; acetone; dicyandiamide; diamond powder 4, obtained from diamond industry waste by grinding them in an AGO-2S planetary ball mill and sifting the fraction to 56 microns. The technology for producing a composite dowel blank is as follows. The roving threads 6 from a special creel device are fed to the tensioning mechanism, in which they are arranged in the appropriate order. The threads 6 arranged in the required order undergo a drying stage and preliminary heating with hot air. The heated roving is immersed in an impregnation bath with resin, previously uniformly mixed with diamond powder 4. The use of such material increases the surface strength and wear resistance of the key, a structural element of the mechanical transmission, by improving the rigidity of epoxy composites by combining carbon fiber fibers with diamond powder 4. After the impregnation bath, the material is pulled through a die to obtain a specified area and shape in the cross-section of the blank for the key. A continuous composite rod is passed through a pulling mechanism, at the exit of which the rod is cut according to the specified size of the key.

A three-position automatic press is used in the production of a composite key. Hot stamping of the key blank is carried out in three positions of technological transitions. At the first stamping position, the blank is calibrated and the rounding 2 of the semi-cylinder is formed in the key blank on one side. Moreover, the 5 roving threads are deformed during the stamping process. Starting from the second stamping position, the rounding 2 of the semi-cylinder is formed in the body 1 of the key on the other side and the formation of the supporting working surface 3 of the key continues. At the third stamping operation, the formation of the supporting working surface 3 of the key is completed. Additionally, the roundings 2 of the body 1 of the key are rolled from the heated blank to complete the formation of the semi-cylinders.

The prepared key is fed into a tunnel oven designed to accelerate the polymerization process of impregnating resins. The hot key is sent to a cooling bath, where it is completely cooled under running water. The cooled key is calibrated on a milling machine for roundings 2 by semi-cylinders and the supporting working surface 3 of the key.

The average uniaxial compressive strength of diamond is 1650 MPa [5], which increases the surface stability of the key.

The main parameter is the load that the mechanical transmission in the form of a key can withstand. To increase the surface stability, strength and wear resistance of the key, by improving the rigidity of epoxy hybrid composites, carbon fiber is combined with diamond powder.

Sources of information

1. Patent RU 226105, IPC F16B 3/00. Published: 05/21/2024 Bulletin. No. 15;

2. Patent RU 226243, IPC F16B 3/00. Published: 05/28/2024 Bulletin. No. 16;

3. Hybrid influence of basalt fibers and basalt powder on thermomechanical properties of epoxy composites. Composites, Part B: Mechanical Engineering, Vol. 125, 2017, pp. 157-164.

4. Gavrilov M.A. Technology of production and chemical-biological stability of epoxy composites based on production waste. Dis. Cand. Tech. Sciences, p. 278, pp. 128, 133-134. http://dissovet.pguas.ru/files/212-184-01/Gavrilov/Dissertaciya_GavrilovMA.pdf.

5. Fundamentals of Rock Physics, Geomechanics, and Massif State Management. Portsevskiy A.K., Katkov G.A. UMO approval (No. 51-73 of 28.06.2004) Registered with the Federal Education Agency (No. 5374 of 16.11.2005), 120 p., p. 21.

Claims (1)

A prismatic composite carbon key comprising a rectangular prism body with roundings along the edges of the long side in the form of a semi-cylinder, wherein the key body is made of a composite material consisting of a carbon fiber base in the form of fiber impregnated with a binding epoxy resin, the roundings of the body are rolled from a heated blank, characterized in that the carbon fiber base in the form of fiber impregnated with a binding resin is made with the addition of diamond powder, previously uniformly mixed in the resin.