SU1237280A1 - Method of producing female die for blanking die set - Google Patents

Description

one

The invention relates to the processing of metals by pressure and can be used in the instumental production of machine building industries.

The aim of the invention is to increase the durability of the die and improve the quality of the parts to be stamped.

FIG. 1 shows schematically a plunger with an electroformed coating; in fig. 2 - a galvanoplastic matrix and a method for fastening forming elements of a stamp.

The method is carried out as follows.

A metal punch 1 is fabricated by machining, and a layer 2 of chemical nickel is deposited on the working surface of the punch, corresponding in thickness to the technological gap between the die and the punch. This layer is passivated on. air with the formation of an oxide film. Then, a metal layer is unevenly deposited on the punch along the length of the punch during its extraction from electrolyte Lithium 3, the profile of which further shapes the profile of the working and failure windows of the matrix. Next, the surface of the electrolytic precipitate of the Punson is passivated in air with the formation of an oxide film 4 and the electrodeposition of the working and structural layers of the matrix 5 is made. After mechanical treatment of the pierce with increased sediment, the punch is not separated from the matrix; The slab 6 and the platen holder 7 on the epoxy adhesive 8. After adjusting the sodium with the punch, the punch is separated from the die and the material of the temporary coating 9 is removed from the galvanoplastic matrix 10. Read the mechanical By means of processing, the dimensions and the profile of the working hole of the die are adjusted.

Example. On a punch made of U10A steel with a hardness of HRC 56-58, I made a matrix of a backlash-free die for punching parts out of 0.1 mm thick molybdenum tape (mark M4). by precipitating a chemical nickel from an aqueous solution that is also

372802

dividing layer. Preparing the surface of the metal punch before coating included degreasing with gasoline, rinsing in hot running water, degreasing with Vienna lime washing in cold running water, activation in 10% hydrochloric acid for 10-30 seconds, rinsing in cold

10 running water and rinse in distilled water. After that, the punch was immersed in a solution of chemical nickel plating with a pH of 6.1-6.2 of the following composition, g / l:

20

25

thirty

35

40

45

;50

35

Nickel sulfate 30 Sodium hypophosphite 15 Sodium acetate 10

The thickness of the deposited layer was 5% of the thickness of the part to be stamped. 5 microns. Deposition was carried out in a 1000 ml heat-resistant beaker, which was placed in an ultra thermostat. Chemical nickel was deposited at a temperature of ib-bv C solution. At the same time, the deposition rate was 20 µm / h with a loading density of 0.4-0.6 dm / l. After the deposition of chemical nickel, a temporary coating was applied to the punch, which in the process of fabricating the matrix made the taper of the working hole of the matrix. Electrolytic nickel was chosen as the coating material due to the low acidity of the sulfamate electrolyte, which is not corrosive to the material of the punch, and easy passivation in the surface layer of nickel on the outer gut. The preparation of the surface of the punch with the deposited layer of nickel nickel before the electrosus by nickel deposition included degreasing with Viennese lime, rinsing with cold running Water and washing with distilled water. Hanging the punch in the nickel plating bath was carried out on a special device that allowed the punch to be kept in a strictly vertical position during the entire cycle. The anodes of the NPAN brand were hung in a galvanic bath parallel to the punch. The interelectrode distance remained constant in all experiments and was 150 mm. The composition of the electrolyte and deposition modes:

Nickel sulfamic acid

g / l

340-360

3-5 30-35

0.1-1.0 4.0

Nickel dichloride, g / l

Bourne acid, g / l Sodium lauryl sulfate, g / l pH.

Cathode current density, A / dm 2

During the deposition of nickel dl. making a cone the punch was slowly removed from the electrolyte, corrected. at the same time, the mode of electrodeposition is in accordance with the area of the part of the punch immersed in the electrolyte.

The angles of inclination, Ы, and, respectively, were 10 and 2, with the maximum thickness of the electrodeposited nickel on the working and non-working parts of the punch (forming the matrix and working matrix, respectively) were 11 and 30 microns, respectively. After the cone was created, the surface of the precipitate was passivated in air (which allowed later to easily separate the working layer of the matrix from the material of the temporary coating), degreased with Vienna lime, washed in cold and distilled water. A working layer of nickel-cobalt alloy electrolyte sulphate electrolyte was deposited on the prepared paunson. Electrolyte composition and deposition modes: Nickel sulphate, g / l 200 Cobalt sulphate, g / l. 19 Sodium chloride, g / l 15 Boron acid, g / l l 30 Paratoluolsulfamid, g / l 0.1 Sodium lauryl sulfate, g / l 0.1 pH 4.8-5.2

Cathode density

current, A / dm Temperature, C

0.8-1.0 20-22

After the working layer was deposited from the electrolyte, 1.5 mm thick nickel-cobalt precipitated a 8.5 mm thick structural layer of copper sulphate electrolyte. The composition of the electrolyte and deposition modes:

Copper sulfate, g / l 200-220 Sulfuric acid, g / l 50-70 ethyl alcohol, ml / l 5-10 Cathodic current density,

Temperature, C18-25

ten

15

20 25 30 ,, Q

five

0

five

Then the punch with electroforming, sediment mechanically processed, creating an intermediate base surface. After machining, the punch and the die were installed in the punch holder 7 and the matrix plates 6 on the epoxy compound 8 (FIG. 2) of the following composition, parts by weight:

Epoxy-Dianova resin containing 20% epoxy groups 100 Polyethylenepolyamines 13.5 Colloidal graphite 10 The punch was removed from the matrix 10, the temporary coating material was removed, and the stamp elements were finally assembled. The hardness of the cutting edges of the fabricated matrix corresponded to HRC 52. A batch of parts made of molybdenum tape with a thickness of 0.1 mm in the amount of 50 thousand pieces was stamped into the galvanoplastic matrix of the die, while the accuracy of manufacturing parts corresponded to 8–9 quality with a rough cutting surface R 40 microns.

EXAMPLE 2. A die, made of steel 45 with a hardness of HRC 38, was used to make a die die for stamping parts from 10 KP steel with a thickness of 0.5 mm. As in example 1, a layer of nickel was applied to the die, corresponding to the required technological gap, by deposition of chemical nickel with a thickness of 25 µm and further, a temporary coating was obtained similarly, providing taper during the fabrication of the matrix. The length of the punch was 10 mm, the working part was 4 mm, the non-working 6 mm. The angles of inclination of the CN to k, respectively, were 15 and 3 °, while the maximum thickness of the electrolytic deposit of nickel on the working and non-working parts of the poundson was 15 and 44 µm, respectively. After deposition of the temporary coating material and passivation of the surface of the precipitate, nickel (from a sulphate nickel plating electrolyte) 2.0 mm thick was deposited as a working layer. Electrolyte composition and deposition mode:

Nickel sulfamic acid, g / l Nickel dvuhloris340-360

ty, g / l

Bourne acid, g / l

Sodium lauryl sulfate, g / l

pH

Cathode density

current, A / dm

Temperature, C

The deposition process was carried out in 2 stages: pulling in with nickel at D 0.3 A / dm for 1 h, then the current density was constantly increased to the working value (0.5-1.0 A / dm); after the creation of the working layer, the structural layer was deposited with a thickness of 10 mm from the sulfamate copper electrolyte. The composition of the electrolyte and deposition modes:

200-260 100

2.5-5.0 0.3-0.8

1-2

1 1 sulfamic acid, g / l

Sulfuric acid, g / l Potassium pyrophosphate, g / l

.rn

Cathode density

current, A / dm

After deposition of the structural layer, as in Example 1, the sediment was machined to create a base surface, then a punch and a die were installed in the corresponding plate, the punch was separated from the die, and the temporary coating materials were removed. The hardness of the cutting edges of the matrix was HPC 32.

Compiled by V.Lukashenko Editor I.Rybchenko Tehred V.Kadar Corrector E.E. Sirokhman

Order 3225/10 Circulation 783 Subscription

VNIIPI USSR State Committee

on inventions and open ™ 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

srig 2

Claims (1)

The METHOD FOR PRODUCING THE DIE-STAMP MATRIX, which consists in pre-forming the matrix using a punch as a model with a temporary coating on it, installing and fixing the matrix with the punch in the matrix holder, separating the punch from the matrix and fine-tuning the working hole of the matrix, differs and with the fact that, in order to increase the resistance of the die and improve the quality of stamped parts, a temporary coating is applied to the punch by deposition of a layer of chemical nickel from an aqueous solution with a thickness corresponding to passivating this layer between the matrix and the punch, passivate this layer in air, then over the resulting layer from the side of the working part of the punch in a section of length equal to the height of the matrix, __ uneven in thickness is deposited in the form of a cone corresponding to the profile of the working hole of the matrix in its longitudinal section, a layer of electrolytic nickel upon gradual extraction of the punch from the electrolyte and adjustment of the electrodeposition mode, passivate again on the conical part of the obtained coating t electrolytic deposition of layers of working and structural matrix. Yu 03 m to 00