SU1719442A1 - Device for thermal stabilization of large-size cupola-shaped products - Google Patents

Abstract

The invention relates to heat treatment and can be used in the heat treatment of the domed bottoms of power vessels, installations. The goal is to improve the quality of heat-setting of products. The device contains a stand 1 with evenly spaced around the circumference of the brackets 2, equipped with lugs 3. The number of brackets at least three. Curved lever 4 is pivotally attached to each bracket, the upper arm of which is made with roller 5 with counterweight 6, and the lower arm with abutment 7 for fixing the workpiece 8. The product 8 heated to the hardening temperature is lowered onto the levers 4, pressing own weight on the shoulder 7 before contact with the roller 5. The rollers 5 fixes the product and corrects the geometry during installation, fixation and quenching cooling. The advantage of the device is to reduce the labor intensity of heat treatment by eliminating the heating of the device, reducing the technological allowances, increasing the durability of the device. Expanding the range of processed products. 1 hp ff, 1 ill.

Description

The invention relates to heat treatment, and can be used in the heat treatment of the domed bottoms of vessels of power plants,

The aim of the invention is to improve the quality of heat-setting.

The drawing shows a device for heat treatment of large dome-shaped products.

The device consists of a stand 1 with evenly spaced around the circumference of the brackets 2, equipped with lugs 3. The number of brackets at least three. In each bracket a curvilinear lever 4 is hinged, the upper arm of which is made with a roller 5 and a counterweight 6, and the lower arm with a protrusion 7 for fixing the product 8,

The device works as follows.

In the initial state, the levers 4 are located so that the lower arm 7 is in the upper position (shown in thin lines). This position is fixed by the stops 3 and the counterweight 6 of the upper arm of the curvilinear lever 4, while the rollers 5 are separated to the side. The product 8 heated to quenching temperature is lowered onto the levers 4 of the device. Pressing its own weight on the locking protrusions 7, the product 8 is lowered until it contacts the roller 5. As a result, the ratio of the arms of the curvilinear lever 4 on the roller 5 develops a force of

P G / nxM / 2, where P is the force on the roller, kg;

G - product weight, kg;

l is the number of levers in contact with the workpiece, pcs;

And, h - lower upper arm of the lever arms, respectively.

The force P, specified by adjusting the ratio of the arms of the lever 4 transmitted through roller 5, automatically centers and warps the heated cylindrical surface at the end of the product 8. Then, with further lowering of the product 8, the other rollers 5 come into effect and the cylindrical surface at the end of the product is fixed. 8, the force applied to each arm 7 of the curvilinear lever 4 decreases in proportion to the number of rollers in contact at that moment 5. The product fixed in the device 8 is gripping an annular stand for 1 and lowered into the quench medium.

When cooled in a quenching environment, in the event of a local leash, the strength of the interaction of one (or

several) of the roller 5 with the end face of the product 8. This leads to a decrease in the force of the product weight on the arm 7 associated with this roller, redistribution occurs

force from the weight of the product 8 to the remaining curvilinear arms 4, in which the force on the rollers 5 increases, resulting in a deformation of the cylindrical surface of the product 8 and correction of its geometry.

0 Execution of at least three evenly spaced brackets with curved levers with rollers hinged in them in the device ensures self-centering and automatic fixation due to its own weight of the product heated to temperatures of quenching in a cold device and improves quality.

0 The quality of heat-treatable products increases as a result of achieving the dimensional accuracy of the cylindrical surface at the end and the flatness of the end due to uniform fixation.

5 of the workpiece fixed in a cold device, as well as ensuring the correction of the geometry of the workpiece by transferring the force from its own weight of the product to the cylindrical surface at the end through a curvilinear lever during installation, fixing and subsequent quenching cooling. Improving mechanical properties by eliminating heat

5 devices to high temperatures and overheating of the quenching medium with a hot device during the quenching cooling process also contributes to obtaining higher quality.

0 Cheaper products are a result of reduced labor intensity while reducing the duration of the installation operations, fixing, unclamping it, and eliminating the heating of the device. By

5, reducing process allowances reduces the metal content of the product.

The use of a device for heat-setting of large-sized dome-shaped products provides improved quality

0 and cheaper products.

Claims (1)

Claim 1. Device for heat-setting of large-sized dome-shaped products, containing an annular stand with 5 elements of fixation of the product, characterized in that, in order to improve the quality of the heat-setting of products, the elements of fixation are made in the form of at least three uniformly mounted around the circumference on the stand of the brackets with eyelets and curvature mounted in them levers, with one end of each round of workpieces, the bracket arm is made with a roller and oppositely mounted with the ability to move the weight, and the other with a protrusion for not in the radial direction along fixing the clip .5 stand, and the rollers and curvilinear snatch2. The device according to claim 1, the differences are made interchangeable, so that, in order to expand the range