Method of manufacture of the plates of the molybdenum alloy "ЦМ2А" used for the press forming

FIELD: mechanical engineering; methods of manufacture of the plates of the molybdenum alloy "ЦМ2А" used for the press forming.

SUBSTANCE: the invention is pertaining to the field of mechanical engineering and may be used at manufacture of the details of the electro-vacuum production (EVP) made out of the molybdenum alloy plates, in particular, of "ЦМ2А" brand by the press forming. The method provides for realization of the control over their mechanical properties during manufacture process, chipping of the samples, the vacuum annealing for removal of the strains caused by shipping. At that the annealing is fulfilled at the temperature of 650°С, and the control over the mechanical properties of the "ЦМ2А" plates is fulfilled by the random inspection of the samples hardness before and after the vacuum annealing and confirm preservation of the mechanical properties defined by the specification for the "ЦМ2А" plates by the calculations in compliance with the set dependences:δt =-174 + 3.745·HV, δ = 37.456 - 0.0848·HV, whereδt - the temporary resistance, n/mm2, δ - the relative elongation, %, HV - Vickers hardness (HV10). The technical result of the invention is conservation of the mechanical properties of the metallurgists delivered metal - the "ЦМ2А" plates till the moment of the press forming - draw, the possibility of stabilization and optimization of the production process for the metallurgists and the customers of the plates, the increased output of the suitable plates at the press forming, saving of the deficient metal, the increased reliability of the articles of the electro-vacuum production.

EFFECT: the invention ensures preservation of the metallurgists delivered metal mechanical properties till the moment of the press forming and draw, the possibility of stabilization and optimization of the production process for the metallurgists and the customers of the plates, the increased output of the suitable plates at the press forming, saving of the deficient metal, the increased reliability of the articles of the electro-vacuum production.

2 tbl

 

The invention relates to mechanical engineering and can be used in the manufacture of parts of vacuum production (STP) from sheets of molybdenum alloy, in particular of the brand ZMA, punching.

Methods of sheet metal forming parts of PCI alloy CMA discussed in the book (Vincerai. Stamping, molybdenum and its alloys in instrumentation. M.: Mashinostroenie, 1977, 150 C. Il.), however, at temperatures much above 700°C.

Drawing a Cup-shaped parts, it is necessary to provide sufficient ductility of the metal while maintaining the strength that is installed on the leaves CMA technical specifications 48-4206-04-00: temporary resistance σin70-110 kg/mm2, elongation δ not less than 10%, the extrusion of the spherical holes on Eriksen punch of diameter not less than 20 mm 6.8 mm, hardness Rockwell with a load of 100 kgf and application of cone 29-45 HRC 100. Paragraph 1.4 above THAT provides: "the Sheets are supplied in the annealed condition with precrystallization structure.

However, in order to increase the yield of forgings and parts of them at an electrical production of the workpiece after cutting disk, before forming, is subjected to vacuum annealing at a temperature of 1070°C. thereby violated the mechanical properties of the metal supplied to the customer. This leads to Nesta is lnasty processability of the metal and makes it difficult technology optimization of the supplier of the leaves. Besides, after additional annealing at a customer not controlled mechanical properties.

Annealing the consumer due to the additional removal work hardening, as the sheets are delivered teplolechenie on the last passages in the size, thickness, equal to 0.8 mm Full removal work hardening is possible only after recrystallization of molybdenum, which is unacceptable according to THE 48-4206-04-00 A.1.4.

For the prototype accepted specifications TO-4206-04-00.

The prototype disadvantages: not regulated additional temperature annealing to preserve mechanical properties.

The objective of the invention to provide temperature vacuum annealing, providing stress relief and work hardening after cutting discs for stamping while maintaining mechanical properties.

The problem is solved in that the selectively test the hardness on the samples before and after vacuum annealing, the annealing is performed at a temperature of 650°and calculations by the established dependencies confirm the preservation of mechanical properties, established specifications sheets CMA. The technical result from implementation of the present invention is to preserve the mechanical properties of the metal before stamping extraction, stabilization and optimization of manufacturing techniques of leaves and yield components in electro-production, reduce the drop of the consumption of scarce metal and improving the reliability of products PCI.

To implement the method execute operations:

1. The control of mechanical properties under the certificate data of this schedule sheets.

2. Cut down the samples and determine the hardness HV10.

3. Annealed samples in a vacuum oven at a temperature of 650°C.

4. Determine the hardness of samples HV10.

5. Installed earlier this dependency (magazine "the Metallography and heat treatment of metals", 1982, No. 9, p.59)

calculated values of strength and ductility, is correlated with THE data 48-4206-04-00, confirming the preservation of mechanical properties.

6. Cut from sheets of disks under stamping parts and annealed them in vacuum at 650°C.

The method was verified practically by using sheets CMA industrial parties. Performed 2 studies with a control sample hardness Rockwell (HRC100) and Vickers hardness (HV10). Technological properties were examined by the extrusion depth (JE8) and the tendency to stratification (SCR, point) - in the first study and JE14 in the second.

To test the hardness HRC100 and SSI developed the special instructions IS.

The averaged test results of samples of the same party supply sheets CMA in the first study and three in the second, shown respectively in tables 1 and 2. In both study remains firmly the th after vacuum annealing 650° (Excerpt 1.5 h) and significantly decreases after annealing at 1070°C. Obtained after annealing at 650°With hardness values 281 and 290 HV10 HV10 ensure the preservation strength: σinequal to 88 and 91 kgf/mm2respectively, which is calculated by (1), δ equal to 13.6 and 12.8% respectively, which is calculated by (2).

The drop in hardness after annealing at elevated temperature 1070°can lead to a drop in strength respectively below the norm σin70 kgf/mm2in particular the content of the alloying elements titanium and zirconium on the lower limit, given THE 48-4206-04-00.

Extrusion depth is maintained at the annealing 650°and decreases with the annealing at 1070°C. a Tendency to stratification varies in the same way. On several industry parties shown a satisfactory yield for stamping after annealing 650°C.

Table 1
Technological properties of leaves CMA schedule No. 205 depending on temperature vacuum annealing
Technological propertiesThe values of the technological properties after vacuum annealing (V/o)
without V/o650°C1070°
HRC1003434 32
HV10285281273
JE8mm4,254,244,18
SCR, score0,250,50,5
Note. JE8- extrusion depth for Eriksen punch of 8 mm diameter samples 30×30 mm

Table 2
The hardness and the depth of the extrusion sheets ZMA three parties of delivery depending on temperature vacuum annealing
Technological propertiesThe values of the technological properties after vacuum annealing (V/o)
without V/o650°1070°
HRC10039,339,538,6
HV10283290269
JR14mm4,244,474,17
Notes: 1. JE14- extrusion depth for Eriksen punch of diameter 14 mm, the size of samples 50×50 mm
2. Not detected differences in the propensity stratification depending on the temperature in chumnogo annealing.
3. Shows the average data for samples from the three parties of the supply of sheets ZMA.

A method of manufacturing sheets molybdenum alloy CMA for stamping, including control of their mechanical properties in the manufacture of cutting samples, vacuum annealing to relieve stresses from logging, characterized in that the annealing is performed at a temperature of 650°and control the mechanical properties of sheets CMA perform custom validation hardness of the samples before and after vacuum annealing and confirm the preservation of mechanical properties, established specifications sheets CMA, calculations based on the established dependencies

σin=-174+3,745·HV

δ=37,456-0,0848·HV,

where σin- tensile strength, n/mm2

δ - elongation, %

HV is the Vickers hardness (HV10).



 

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