RU214624U1 - Composite Bolt - Google Patents

Abstract

The utility model relates to devices for connecting composite structures and can be used in the assembly of threaded connections. A bolt made of composite basalt material, containing a hexagonal head and a rod with smooth and threaded parts, while the bolt is made of a composite material, including a basalt base in the form of a fiber impregnated with binder resins, a hexagonal head is formed by a stamp from a heated billet, and the basalt base is in the form of a fiber , impregnated with binding resins, is made with the addition of basalt powder, pre-mixed in the resin. The technical result is to increase the stability of the threaded connection by improving the rigidity of epoxy composites. 1 ill.

Description

Technical field

The utility model relates to devices for connecting composite structures and can be used in the assembly of threaded connections.

State of the art

A fiber-reinforced composite nut is known (CN patent 111169038. Published 2020-01-03) containing an inner core and a composite winding wrapped around the outer side of the inner core, the inner core being formed by a press from one or more overlapping layers of fiber-fabric prepreg material, and the composite winding is obtained from one or more overlapping layers of continuous fibrous prepreg material or fibrous fabric prepreg material after curing, and the fibers used for continuous fibers and/or fiber fabric contain one or a mixture of two or more glass fibers, basalt fibers, polyester fibers, aramid fibers and carbon fibers.

The disadvantage of the known device is the low stability of the threaded bolted connection.

The closest known device is continuous carbon fiber composite bolt (CN patent 111621119, published 2020-09-04), characterized in that continuous carbon fibers are used as the reinforcing body of the carbon fiber composite material continuous bolt, imidazole epoxy resin is used as matrices for making prepreg, the prepreg is made from 60-70% continuous carbon fibers, 20-30% imidazole epoxy resin and 5-15% curing agent by weight percent, and the continuous carbon fiber composite bolt is formed by curing the prepreg.

The disadvantage of the closest device is the low stability of the threaded bolted connection.

Utility Model Disclosure

The technical result of the utility model is to increase the stability of the threaded connection by improving the rigidity of epoxy composites.

The present technical result is achieved in a bolt device made of composite basalt material, containing a hexagonal head and a rod with smooth and threaded parts, while the bolt is made of a composite material, including a basalt base in the form of a fiber impregnated with binder resins, the hexagonal head is formed by a stamp from a heated billet, moreover, the basalt base in the form of a fiber impregnated with binder resins is made with the addition of basalt powder preliminarily mixed in the resin.

The hallmarks are

a basalt base in the form of a fiber impregnated with binder resins is made with the addition of basalt powder, the use of such a material increases the stability of the threaded joint by improving the rigidity of epoxy composites by combining basalt fibers with basalt powder [3];

preliminary uniform mixing of basalt powder in a binder resin, this maintains the stability of the threaded bolted connection due to the rigidity of hybrid epoxy composites.

Comparison of the proposed solution with analogues and the prototype did not reveal in them the features that distinguish the proposed solution, this allows us to conclude that the criterion of "novelty" is met.

Brief description of the drawing

The figure shows a frontal view of the bolt, including 1 - bolt body made of a composite material with a basalt base impregnated with binder resins with the addition of basalt powder; 2 - bolt head; 3 - smooth part of the rod; 4 - threaded part of the bolt shaft.

Implementation of the utility model

The main raw material for the production of composite bolts is basaltoring. In addition, for the manufacture of a bolt from a composite, it is required: resin; winding harness (basaltoring, which goes to the winding of the bolt rod to create a thread); ethanol; acetone; dicyandiamide; basalt powder obtained from basalt chips by grinding it in an AGO-2S planetary ball mill and sieving a fraction up to 100 microns. The production technology of a bolt from a composite material is as follows. Roving threads from a special device (creel) go to the tension mechanism, in which they are arranged in the appropriate order. Arranged in the right order, the threads go through the stage of drying and preheating with hot air. Heated roving is immersed in an impregnation bath with resin, previously evenly mixed with basalt powder in a mixer. Continuous, the bar is passed through a pulling mechanism, at the exit of which the bar is cut according to a given size. After the bath, the material is pulled through a die to obtain a bolt body 1 of a given cross-sectional area of the rod and its length, taking into account the formation of a hexagonal head 2 by a stamp from a heated billet. The profiling die can be made, for example, in the form of a detachable steel structure, consisting of two rectangles with a half-figure milled and grooved along the length of each part, which, when closed, form a surface in the form of a circle corresponding to the area of the target device.

In the production of a bolt from a composite, a three-position automatic press is used. Hot stamping of the bolt head blank 2 is carried out in three positions of technological transitions. At the first stamping position, the workpiece is calibrated and the formation of the bolt head 2 begins. forming a part of the rod for threading in the bolt blank. To work as a knurler, the rod is made along the average diameter of the thread. The knurler has a chamfer with the same profile when viewed from the end, and with the full height of the thread. The thread is made with a knurled extrusion.

The prepared bolt passes into a tunnel oven designed to accelerate the polymerization process of impregnating resins. The hot bolt is sent to a chilled bathroom where it is completely cooled under running water. Cooled bolts on the automatic lathe undergo thread calibration.

The claimed device increases the stability of the threaded connection during its operation and eliminates its possible weakening.

Sources of information

1. Patent CN 111169038. Published 2020-01-03;

2. Patent CN 111621119, Published 2020-09-04;

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

Claims (1)

A bolt made of composite basalt material, containing a hexagonal head and a rod with smooth and threaded parts, while the bolt is made of a composite material, including a basalt base in the form of a fiber impregnated with binder resins, the hexagonal head is formed by a stamp from a heated billet, characterized in that the basalt base in the form of a fiber, impregnated with binding resins, made with the addition of basalt powder, pre-mixed in the resin.

Images