SU1599151A1 - Method of rolling articles of cultivator tooth type and mill for effecting same - Google Patents

Abstract

The invention relates to the processing of metals by pressure and can be used in the manufacture of special products during the hot rolling of the blades of the cultivators' lancets. The aim of the invention is to improve the quality of the product by obtaining the same forging temperature of products with different thickness and increasing productivity. Two blanks (G) 26 and 27 are supplied to inductors 10 and 11. Heating of blanks 26 and 27 is performed using regulators 17 and 18 with generator excitation windings 12 and 13. Temperature sensors (DT) 14 and 15 measure the heating temperature of each billet on its radiation. Upon reaching the billet 1150 ± 5 ° C, the signal from the DT 14 enters the comparison element 23. One of the systems for measuring and controlling the temperature of the billet 26 operates through the DT 14 logic chain - adder 19 - amplifier 24 - comparator 21. When the billet 27 reaches the temperature 1150 ± The 5 ° C signal from the DT 15 enters the comparison element 23. The second system for measuring and controlling the temperature of the workpiece 27 is activated according to the DT 15 logic circuit - the adder 20 - the amplifier 25 - the comparator 22. At the output of the comparison element 23, a signal appears 26 and 27 hearth into stamped and rolled. As a result of rolling two workpieces at the same time when the required forging temperature is reached on each workpiece, regardless of the thickness of the workpiece, productivity and accuracy of the resulting dimensions on the product is increased. 2 hp f-ly, 7 ill.

Description

On executive mehoiz / 1y FIG. 7

By means of generators 12 and 13, the temperature sensors DT 14 and 15 measure the heating temperature of each billet by its radiation. Upon reaching the billets 26 + 1150 5 C, the signal from DT 14 enters the comparison element 23, one of the measurement systems and control the temperature of the workpiece 26 in a logical chain

DT 14 Adder 19 Amplifier 24 - .Comparator 21 e. When Procurement 27 reaches a temperature of P50 ± 5 ° C, the signal from DT 15 enters the reference element 23c. The second measurement system is triggered.

and control the temperature of the workpiece 27 along the DT 15 logical chain - adder 20 - amplifier 25 - compiler 22o. At the output of the comparison element 23, a signal is received by which the workpieces 26 and 27 are fed to the die and rolled. As a result. rolling two workpieces at the same time, when each workpiece reaches the required forging temperature regardless of the workpiece thickness, it increases with - the productivity and accuracy of the resulting dimensions on the product, 2 3 o By f-ly, 7 silt,

The invention relates to the processing of metals by pressure and may be

used in the production of special products for the hot rolling of cultivator blades

The aim of the invention is to improve the quality of products by obtaining the same forging temperature on products with different thicknesses and increasing productivity.

Figure 1 presents a graph of the schematic dependence of the heating time of billets of various masses when they reach the same temperature at the end of heating T (an option when the billet with a lower mass starts to heat up first); Figure 2 is the same, the variant, when the first begins to heat the chargers - ka with a higher mass; in FIG. 3, even when the mismatch time for the start of heating is 1} o O, Toev of the workpiece JC. different masses begin to heat simultaneously; on FIG4 - an option when the masses of the heated blanks are the same, but there is a mismatch in the time of the start of heating; on figvZ - mill for the NIN of the proposed method; on figab same, top view; FIG. 57 is an electrical diagram of systems for changing and controlling the heating temperature of billets for rolling;

The method is carried out in the following manner.

The first option A billet with a smaller mass of the first falls into the induk 5

five

d

.g og

The torus. Its heating time to temperature T is 1}. After a time C of 0.5-1.5 s, a billet with a larger mass enters the second high frequency inductor. Its heating time to temperature TO is C, the temperature Td of the end of heating of the first billet is kept constant until the other billet reaches the set temperature T by heating the Cycle Time: 1 + I.

The second variant is about a billet with a mass of pain first enters the inductor,. Its time to heat up to temperature T is Through time m L (, equal to 0.5-1.5 s, to the inductor of the second high-frequency post gets billet with less Its heating time to the temperature Tp is t ,,, the temperature T of the end of heating of the first workpiece is kept constant until the other when the workpiece reaches the specified heating temperature T. The cycle time: Id + C,

The third option. Billets with different weights begin to heat up to a temperature T at the same time.

lower mass is

but .

the heating time of the billet with a higher mass is –g, Time qi: lcd + L

The fourth option, two billets with the same mass are delivered to the heating position, R. the heating time of the first billet C | o Through LO time (i.e. with the mismatch of the time of the start of heating) enters the inductor sec.5 .1

The first high-frequency post is a billet with a mass of the same; Time of Cyla: g, ..

The average heating time for analyzing the four possible heating options is 0.75 + 0.5 (, -: - C), and for the prototype it is + C (t, e, for a billet with a larger mass). the way with the heating time of the prototype, it is clear that O, 73 f (, + .0.5 (1, +

 C) v2. .

Thus, from the considered options for heating two blanks, the temperature of the two blanks is simultaneously stabilized, regardless of the fluctuation of their masses and the time they started heating relative to one another, which leads to the dimensional accuracy of the parts. After their rolling due to the stabilization of the temperature mode of treatment. temperatures and

synchronization of the heating cycle of the billet provides an increase in the productivity of the method by reducing the total heating time of two billets ..

The mill for rolling the cultivators contains a frame 1 on which ppita 3 is mounted for movement from a hydraulic cylinder 2, on which a rolling die 4 is mounted, moving it by rolling roller 5 mounted on a shaft 6 that is fixed in racks 7 of frame 1, two heating installations containing transformers 8 and 9 with inductors 10 and 11 connected to the excitation windings of generators 12 and 13, two temperature sensors, which are made in the form of pyrometers 14 and 15, are electrically connected to

by the rest of the system 16 for measuring and regulating the temperature, the regulators 17 and 18 with the excitation windings — the generators, the mechanisms for supplying and removing the blanks (Figures 5 and 6 are not shown). The system 16 for measuring and controlling temperature consists of mz adders 19 and 20, comparators 21 and 22, comparison element 23, amplifiers 24 and 25,

The adders 19 and 20 are functional elements whose output signal is equal to the sum of the input signals (meaning

sixteen .

similar adder). Comparators 21 and 22 of system b perform the function of comparing two input signals.

and

1, if a b I O, if a b

P

five

From 5

Comparison element 23 (or threshold circuit) is a logical element that performs the AND function (logical coincidence) about Amplifiers 24 and 25 — Asymmetric voltage amplifiers (gain factor), which serve to amplify the voltage of adders 19 and 20 and the exciter winding - using high-frequency generators 12 and 13 through controllers 17 and 18 "

The mill for rolling the cultivators is working in the following way.

The blanks 26 and 27 are fed to the inductors 10 and II and are heated by PMTV. The sensors 14 and 15 of the temperature measure the heating temperature of the blanks 26 and 27 by radiation. At the beginning of the heating of the blanks 26 and 27 in the inductors 10 and 11, the output voltage 11, the sensors 14 and 15 teparapies are few, fall on adders 19 and 20, where it folds with the reference voltage U of opposite sign (Uo corresponds to the threshold temperature equal to the temperature of the end of heating 1 100-1200 ° C) o In this case; The input voltage of the amplifiers 24 and 25 is close to. Thus, at large input voltages of the amplifiers 24 and 25, the power of the inductors 10 and 11 is maximum,

In the process of heating billets 26 and 27, the output voltage of temperature sensors 14 and 15 increases, the voltage at the input of amplifiers 24 and 25 tends to be small, which corresponds to the end of heating of billets 26 and 27 when the set temperature is reached. signaling that blanks 26 and 27 have reached a predetermined temperature with an accuracy of 4 ± 5 ° C (t, e "the input signal of amplifiers 24 and 25 has become less), thus, when the voltage at the input of amplifiers 24 and .25 decreases, the power of inductors 10 and P begins y.2nshats to the times When the predetermined heating temperature T. 1100 ° C sravnitJVI P50 -

with with measurable .Т „, (Тз .t Д),

71599151

If the workpiece 26 is heated before the workpiece 27 or vice versa its temperature

The temperature of the end of heating remains constant and the corresponding signal

The flow enters element 23 of the comparison. In this case, the logical chain sensor temperature sensor 14 —19 — amplifier 24 — comparator 2 of the workpiece 26, which heats up first, triggers. When the billet 27 reaches a predetermined heating temperature after the operation of the comparator 22, the output of the comparison element 23 results in a signal-corresponding to the fact that both the billet 26 and 27 have reached the predetermined heating temperature ;; . VET- 1 50 С ± 5 С, According to this signal, blanks 26 and 27 using mechanisms send (on fig 5 7 not shown) data in string 4o to Hydraulic cylinder 2 plate 3 with stamp 4 and blanks 26 and 27 stir, and on the bed frame 1. Under the pro KaTiibiM roll 5o. Rolling of the workpieces 26 and 27 in the die 4 is made with the help of the rolling roll 5 Rolled workpieces 26, and 27 are removed from 4 in

Example, Rolling is subjected to blanks 1-sided paws LS-1.7 (left) and C - 1.7 (right) from steel SZG; the mass of which fluctuates in accordance with the thickness tolerances on hot-rolled sheet steel within 0.83 0.94 kg. The thickness of the heated billet has certain deviations according to GOST and ranges from + 10 to -10% for a sheet of 5 m and from +3 to -8% for a sheet of 10 mm, which is O, .8-1.1 mm . Such a fluctuation of the sheet thickness, causing a change in heating temperature within ± 100-, leads to a fluctuation of space forces and strain elongations of the rolling mill, which causes a fluctuation in the volume of the deformation zone within 15–20% and leads to the thickness of the cultivator roll blade that goes beyond the tolerance, since the tolerance on the blade thickness is

.tOjl-mmo In fact, depending on the fluctuations of these factors, it is: fO, 5 - 0.1 mm, which is the cause of the defect. Moreover, the fluctuation of the spacer forces leads to wear and tear of the tool and energy consumption.

eight

0

five

f forging start for dl (), which leads to

(

When the mass of the blanks fluctuates in the range of 0.83–0.94 kg, the time required for heating these blanks to a temperature of 1,150 ° C is 8.5–10.0 ° C. At the same time, the temperature variation of the heating end is in the range of Affairs i150-1350 with. The upper limit of the heating temperature exceeds the test site of 65G metal decarburization of the rolling zone metal. This circumstance, worsening the mechanical characteristics of the metal of the rolled billet and the accuracy of its geometrical parameters, leads to an unrecoverable defect.

Rolling is carried out in a persistent manner. Two blanks 26 and 27 with a mass of 0.83 and 0.94 kg, respectively, are fed to inductors 10 and 11 (Figures 5-7), where they are heated. Control pyrometers measure the heating temperature of each of the blanks 26 and 27 according to their radiation. When the billet 26 with a mass of 0.83 kg reaches the temperature T, 1150 (its heating time is 8.5 s), the signal from the temperature sensor 14. enters the comparison element 23. In this case, the logical string of data — temperature 14 — the adder 19 is triggered first. - amplifier 24 - comparator 21 of the workpiece 26, the temperature of the end of heating T, is maintained constant when it reaches 27 with a mass

0.94 kg of the temperature of the end of heating about

45

Tp 1 15015 0 (its heating time is 10 s} after the comparator 22 triggers on 0 the output of the comparison element 23, a signal is received, according to which workpieces 26 and 27 using feed mechanisms (not shown in figure 5-7)) rolling the blades on the blanks 26 and 27 at a speed of 570 mm / s. Rolled blanks 26 and 27 are removed from the die 4, cutting around the blade and controlling the blade thickness.

The carried out inspection of rolled products showed the thickness identity of the nano-blades (tolerance on TOL1TSIN ± 0.2 mm according to the requirements :) and the absence of a decrease in the mechanical 55 characteristics due to decarburization,

Due to the simultaneous rolling of two zag ozovok performance

50

The mill is increased by 10-15%. The accuracy of rolled products increases as the result of the rolling of the billet at the required forging temperature and at different thicknesses of the billets.

Claims (1)

Invention Formula 1 A method of rolling products like cultivators' paws, in which products are cut from a strip, heated and rolled, characterized in that, in order to improve the quality of products by obtaining the same forging temperature on products with different thickness and increasing productivity, heating of two products separately; at this time, the forging temperature of the heating product with a TOL1TSIN temperature is kept constant 7b  LO rr Z Heating time Figure 1 That U  .9 7 g Heating time Figure 1 until a product with a greater thickness of forging temperature 1 is reached and then they are co-rolled. 2o A rolling mill product of cultivator legs, containing two working tools installed in the frame, heating elements and two temperature measurement and control systems in the form of temperature sensors electrically connected to the reference element, By the fact that, in order to improve the quality of the product, each measurement system is equipped with an adder, an amplifier and a comparator, the outputs of each adder are connected to an amplifier and comparator, and the outputs of each comparator are connected to the input of the comparison element  Time nagrebo yp FIG. five ff Heating time Фtf.4 five / 5 fig 6 Compiled by P, Kostin- Editor Y. Sereda Tehred d. Oliynyk Proofreader O. Tsiple  3109. Circulation 462 VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow., Zh-35, Raushsk nab. 4/5 Production and Publishing Combine Patent, Uzhgorod, st. Gagarin, 101 Subscribe