Aluminum extrusion press: billet heating and feeding equipment

 

Accessory extrusion press

In addition to proper extrusion press any line for extrusion of aluminum profiles includes about ten units of different auxiliary equipment. Обычно различают вспомогательное оборудование ДО пресса и вспомогательное оборудование ПОСЛЕ пресса [1, 2]. to press equipment includes, including:

  • Table loading ingots or billets in the heating furnace
  • Oven heating of ingots or billets
  • Scissors hot cutting pillars
  • Loader heated preform in a press
  • Apparatus lubricant end of the heated preform.

Sometimes accessory to the press can also include

  • Machine for cleaning pillars.

Table load of ingots and billets to the furnace heating

Equipment for the continuous supply of raw press for pressing the blanks may have a different structure and configuration depending on, что является исходным материалом на входе в пресс:

  • pillars – typically 6-meter round ingots or cheroots
  • blank - segments pillars, cut to a predetermined size, for example, length 600 mm, for direct loading into container.

Often the loading table columns and blanks has a slight slope to facilitate their movement to the loading axis in the oven. Hydraulic system traversing poles avoids strikes poles against each other and on the hardware elements. Продольная подача столбов в печь производится с помощью цепного конвейера (рисунок 1).

Figure 1 - feeding table pillars and pillars loading conveyor to the furnace heating
manufactured Tecalex [3]

The oven heating billet pillars and

Gas heating furnace preheated pillars or preform to a predetermined temperature. The main task of these furnaces - is to ensure accurate and constant temperature blanks for feeding in their immediate press container.

Most furnaces heating pillars used direct heating flame burners. Горячие продукты горения газа затем направляются навстречу поступающим столбам (заготовкам) для их предварительного подогрева. Это дает значительную экономию энергии [2, 3]. In each heating zone of the furnace set contact thermocouple, которые обеспечивают контроль температуры нагрева столба (заготовки) (рисунок 2) [3].

Figure 2 – Печь нагрева алюминиевых столбов (заготовок). Виден ряд контактных термопар контроля температуры нагрева по зонам печи [3]

Scissors hot cutting pillars

hot shears cut from the preform post optimal length, which depends on the compression parameters, в том числе от типа матрицы и конструкции профиля (рисунок 3). When loaded into a furnace pre-cut blanks is achieved precedence feeding blanks of different lengths.

The cutting system of heated billets has special cutting matrix, which provide a minimum distortion of the column from the effects of cutting effort. After that, the preform is cut a predetermined length, Post residue was returned to the furnace, where it is heated up to the next pillar cutting cycle. Typically, the remaining short end of the column is connected to a shortened work piece from the next column, that would get given the full length of the workpiece. Due to some difficulties in the processing of short pieces pillars usually try not to leave residues shorter column of a minimum length. This is achieved by means of special programs for programmable logic controllers.

Figure 3 – Ножницы горячей резки алюминиевых столбов [3]

Transmitter heated preforms in the press

supply system the heated billet from the heating furnace directly to the container, equipment is very critical for high performance media. The object of these systems is to feed the workpiece exactly at the axis of the container, to ram press could without problems and without the participation of the operator to load it into the container.

The applied supply system the heated preform depends on the structural arrangement of the press, for example, Usually it is the press or short-stroke. A classic example of loader heated preforms is shown in Figure 4 [3].


Figure 4 – Устройство подачи нагретой заготовки на пресс [3]

Movement of the workpiece from the hot shear is produced by an electric drive and a polyurethane toothed belt, reinforced with steel cord. The accuracy of displacement is provided by a precision programmable decoder. Transfer to a container preform made two movable gripper with hydraulic drive. The system allows you to work with a composite preform.

Device for lubrication on the ends of blanks

To prevent adhesion of the workpiece to press the washer on the end of the workpiece has traditionally applied a special lubricant. В настоящее время в алюминиевой промышленности применяют три способа нанесения смазки на поверхность между заготовкой и пресс-шайбой [2]:

  • пламенное нанесение углеродной сажи;
  • спрейерное нанесение специальных жидких составов;
  • elektrosticheskoe spraying powder of boron nitride.

Flaming coating the soot preform end remains the most common and, Unfortunately, the most reliable, удобным и дешевым методом (рисунок 5). Harvesting is delayed in its position prior to loading the container for a few seconds. Acetylene torch lights on 3-4 seconds with a flame, directed at the workpiece end. combustion mode acetylene - with a maximum allocation of black smoke. Generally, this procedure was subjected to each preform. Основной проблемой этого метода является проблема загрязнения воздуха в рабочей зоне пресса [2].

Figure 5 – Устройство нанесения ацетиленовой сажи на торец заготовки [2]

Machine for cleaning aluminum pillars

Sometimes, especially in the manufacture of high-precision aluminum profiles with high demands on the quality of their surface, в состав оборудования для подачи заготовок включают машину для чистки поверхности слитков-столбов перед загрузкой их в печь нагрева (рисунок 6).

Figure 6 – Машина для чистки алюминиевых слитков-столбов [3]

Poles on its way to the heating furnace pass through the rotating wire brushes, which remove oxides and other contaminants from the surface. In many cases, the surface of the pillars is removed large quantities of dirt, oxides and other contaminants. It contributes to the quality of pressed aluminum profiles, особенно качества их поверхности [2, 3]. This system requires additional effort to clean up and disposal of dust, which occurs when cleaning poles.

Sources:

  1. Saha P. Aluminium Extrusion Technology, ASM International, 2000.
  2. http://pressmaintmanual.com/files/95914838.pdf
  3. Tecalex – http://www.tecalex.com/en/logs-brusher.html