Blank preparing method for producing hollow thin-wall articles

FIELD: plastic working of metals, possibly manufacture of blanks designed for producing hollow thin-wall articles such as aluminum tubes, bottles.

SUBSTANCE: method comprises steps of feeding initial predetermined-size material to pressing machine having working units. In said working units initial material is subjected to successive parametric pressing by transitions. Pressing is realized at speed directly proportional to specific pressure of pressing process according to relation: Vt = KPt where Vt -parametric pressing speed at time moment t; Pt - specific pressure of pressing process at time moment t; K = (Pend - Pst)tk - proportionality coefficient; Pend - specific pressure at pressing process termination; Pst - specific pressure at pressing process starting; tk - time period of pressing process.

EFFECT: improved quality of blanks, enhanced efficiency of production of ready articles.

2 cl, 1 dwg

 

The invention relates to the processing of metals by pressure and can be used for the manufacture of blanks used in the production of aluminum tubes, bottles and the like, for example, household chemicals, food, perfumery and pharmaceutical industries.

A known method of manufacture of aluminium billets for the production of tubes from strips and tapes in rolls that are widely used in industry (book Gneckow, Aigamedev. "Production of aluminum tubes", M:Agropromizdat, p.44-46), including the filing of the original material and cutting blanks on the presses.

The disadvantage is the high cost of the raw material, a large flow rate (up to 40% of waste), low resistance stamps and low productivity of the process by the press.

The texture of the cut blanks while maintaining the texture of the original rolling metal, i.e. longitudinal linear arrangement of grains. This texture is characterized by a small number of grains per unit area (about 60 grains / mm2) and has a low strength characteristics. This reduces the quality of the workpieces. As a result, when further pressing of the glass tubes is its longitudinal cracking.

There is also known a method of cold extrusion of metal elements with blind or through-hole that is closest to the number of essential features (Rossi who, application for invention No. 2004121678, UK 1/68, UK 21/00)adopted for the prototype and including supply is cut from a rod of metal of a given length and the pressing performed by the serial transmission line segments through work units presses.

Mode pressing only provide a certain value of the specified pressure, which does not affect the strength and physico-chemical characteristics of the produced workpieces. The texture of the cut blanks while maintaining the original texture of the metal, i.e. the longitudinal grains with a small number of them, about 60 grains / mm2and a large intergranular space. This reduces the strength characteristics of the metal, such as tensile strength (no more than 30 kg/mm2) and elongation at break (no more than 8-15, %), and thus reduces the quality of the workpieces. As a result, upon further pressing of the glass tubes is its longitudinal cracking and intergranular violations.

In addition, the performance of the process on presses low due to the loss of time for transporting the original metal blanks between operations.

The objective of the invention is to improve the quality of the workpieces and improving the performance of the process.

The proposed method for the manufacture of blanks for obtaining hollow products involves feeding a source material is material of a given size in the installation for pressing, contains the work units, and consistent parametervalue pressing the source material on transitions in these process units. Unlike the prototype pressing the source material is carried out at a speed directly proportional to the specific pressure in accordance with the dependence of Vt=KPtwhere

Vt- parametervalue pressing speed at time t;

Ptspecific pressure at time t;

K=(Rto-Rn)/ttois the coefficient of proportionality;

Pto- specific pressure at the end of compression;

Pn- specific pressure at the beginning of compression;

tto- the end-time pressing.

For pressing use the installation in the form of a rotary line. The proposed dependence of the rate of extrusion from the specific pressure provides a seal with the original texture of the metal, i.e. the reduction of intergranular space, which increases the number of grains per unit area (over 80 grains / mm2). While retaining the necessary hardness HB=19-28 kg/cm2. This increases the strength of the metal to 46 kg/mm2and elongation at break of up to 25%, which increases the quality of the workpieces and excludes upon further pressing of the glass cracking of metal (voloviny), Mikri talinya violations.

Using to implement the method of the rotary line, increase the efficiency of the process by eliminating stops between operations and exclude the transport path when transferring workpieces from one operation to another. Technological operations occur during continuous transportation of the blanks.

Thus, all the claimed features are essential and solve the assigned task.

The proposed method is implemented as follows.

Cut the aluminum rod (obtained, for example by pressing with the following drawing) length serves on the rotor pressing, where by successive Parametrierung transitions get the puck. If necessary to produce blanks with hole washer then goes through the transport rotor on the rotor for cutting holes.

The mode is set by pressing the formula

Vt=KPt/1/, where

Vt- parametervalue pressing speed at time t, kg/mm2·s-1;

Ptspecific pressure at time t, kg/mm2;

K - proportionality coefficient (a constant value).

Source parameters of the technological process of pressing pre-set experimentally depending on the chemical composition, the production method, the strength characteristics and the physical and the Ko-chemical state of the surface of the rod, for example:

Pn=10.5 kg/mm2,

Pto=45,56 kg/mm2,

tto=0,417 min, where

Pn- specific pressure at the beginning of pressing,

Pto- specific pressure at the end of pressing,

tto- the end-time pressing.

The factor of proportionality is chosen empirically.

K=tgB=(Pto-Pn)/tto/2/

To=(45,56-10,5)/0,417=83,5, where

In the slope of the line graph of the change in the intensity of compaction pressure (see drawing).

The specific pressure Ptdetermine on the schedule. Knowing and Ptdefine Vtformula /1/

For example, at time of 0.3 minutes from the beginning of the pressing process unit pressure (according to schedule) will be equal to 35.6 kg/mm2.

Then parametervalue pressing speed

V=83,5×35,6=2972,6 kg/mm2.

As the source material is also used aluminum pellets, or other forms.

1. The method of making blanks for receiving a hollow thin-walled products, including the filing of the original material sizes specified in the installation for pressing, contains the work units, and consistent parametervalue pressing the source material on transitions in these process units, characterized in that the pressing of the original material is carried out with speed, straight proporciona Inoi specific pressure in accordance with addictions

Vt=CUt,

where Vt- parametervalue pressing speed at time t;

Ptspecific pressure at time t;

K=(Pto-Rn)/ttois the coefficient of proportionality;

Pk- specific pressure at the end of compression;

Pn- specific pressure at the beginning of compression;

tto- pressing time.

2. The method according to claim 1, characterized in that use the device for pressing in the form of a rotary line.



 

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