SU1537710A1 - Method of chemical milling of metal parts - Google Patents

Abstract

The invention relates to methods of chemical dimensional processing of metals and can be used in mechanical engineering for the production of parts of various profiles. The aim of the invention is to expand the technological capabilities and obtain details of a complex profile. After installing and fixing the preform in the nozzle and placing a non-dissolving screen along the surface of the preform in the gap formed between the screen and the preform, a chemical reagent is supplied with a constant flow rate. The change in the reagent speed and, as a result, the unequal planned metal removal during the diffusion dissolution of the workpiece surface is ensured by varying the length of the cross section of the gap between the part and the screen. The screen ordinate with the longitudinal coordinate X is calculated using the formula: H (X) = H (X) + {[H (X) -H ₀ ] ^{M + 1} + ΑΤ} ^{1 / (M + 1)} , where Α = A ₀ ^. C _r ^{. N.} (Q / B) ^M. (M + 1) / ρ

Τ - part processing time

H ₀ - the initial thickness of the workpiece

H (X), H (X) - the thickness of the part and the ordinate of the screen in an arbitrary section

A ₀ , M - constant dissolution kinetics

metal ρ-density

Channel B-width

X - longitudinal coordinate

C _R , Q - concentration and consumption of chemical reagent solution

N-stoichiometric coefficient. 4 il.

Description

The invention relates to methods of chemical dimensional processing of metals and can be used in mechanical engineering for the production of parts of various profiles.

The purpose of the invention is the expansion of technological capabilities and obtaining details of a complex profile.

FIG. 1 shows a diagram of an apparatus for realizing a method of chemical milling; in fig. 2 is a section A-A in FIG. one; on fig.Z - scheme

to the calculation of the profile of the screen: in figure 4 (a, b, c, d) - profiles of parts that can be obtained by this method.

A device for implementing the method of chemical milling of metal parts comprises a nozzle 1, in which a rectangular preform 2 is fixed. Along the surface of the workpiece 2, a non-dissolving screen 3 of a defined, pre-calculated profile is installed. Nozzle 1 system

pipelines connected to the centrifugal pump 4. At the entrance to the nozzle is a buffer tank 5, which serves to stabilize the flow of reagent. Ventil 6 and rotameter 7 are designed to set the required solvent consumption. The chemical reagent after pumping through the gap between the workpiece 2 and the screen 3 enters the tank 8.

The method is carried out as follows.

After installing and fixing the workpiece 2 in the nozzle 1 and placing along the treated surface of the workpiece, an insoluble screen 3 into the gap formed between the screen and the workpiece is supplied with a constant flow rate of thermodynamic reagent. Due to the reagent velocity varying along the gap length, an uneven C7e metal of the workpiece and the formation of a part of a given profile occur. The unequal planned metal removal during the diffusion dissolution of the treated surface of the workpiece 2 due to a change in the speed of the reagent is ensured by varying the length of the cross section of the gap between the part

n is the stoichiometric coefficient.

Such an embodiment of the gap ensures the creation of a flow of reagent with a rate varying according to a certain law along the dissolution surface, which makes it possible to obtain an uneven planned removal of the metal and obtaining parts of complex shape.

Claims (1)

Invention Formula The method of chemical milling of metal parts, including the effect of a chemical reagent on the surface to be treated, when it is forcedly pumped through the gap formed by the part and the non-growing screen and variable along the length of the part, differing in its technological capabilities and obtaining parts of a complex profile, is not the same along the workable the surface of the workpiece, the planned metal removal during its diffusion dissolution, creating different reagent rates in variables and screen. The ordinate of the screen on the OCT-30 along the length of arbitrary cross sections of the gap Noah x coordinate calculated by H (x) Mx) + H (x) - +), Mp. (S) Vi); part processing time; the initial thickness of the workpiece; (x), (x) BUT about m f ъ x C R thickness of the part and the ordinate of the screen in any section; constant dissolution kinetics; metal density; gap width; longitudinal coordinate; concentration and consumption of a solution of a chemical reagent; five 0 five 0 between the part n screen, the screen ordinate in which the longitudinal coordinate is calculated by the formula: f H (x) h (x) + H (x) -), / A about Sap / Q nf. where c / ---) (t + 1); h (x), H (x) is the thickness of the part and the ordinate of the screen in an arbitrary section; longitudinal coordinate; initial thickness. constant dissolution kinetics; part processing time; concentration and consumption of a solution of a chemical reagent; the stoichiometric density of the metal; channel width. x ho A,., Ha l L g o "H P P b t 1 FIG. 2 FIG. five Fy