CN102371339A

CN102371339A - Casting process method combining steel-shot chilling and vibratory pouring based on disappearing die

Info

Publication number: CN102371339A
Application number: CN2011103023961A
Authority: CN
Inventors: 杨宗联; 叶升平; 罗通; 郭鹏
Original assignee: HUBEI GENGLIAN WEAR-RESISTANT MATERIALS TECHNOLOGY CO LTD
Current assignee: HUBEI GENGLIAN WEAR-RESISTANT MATERIALS TECHNOLOGY CO LTD
Priority date: 2011-10-09
Filing date: 2011-10-09
Publication date: 2012-03-14
Anticipated expiration: 2031-10-09
Also published as: CN102371339B

Abstract

The invention discloses a casting process method combining steel-shot chilling and vibratory pouring based on a disappearing die. The casting process method combining steel-shot chilling and vibratory pouring based on the disappearing die is characterized in that a manufactured foam model is placed into a chilling sand box, steel shots are also placed at the position of a clearance between the foam model and the chilling sand box, then the chilling sand box is placed into a sand box with a vacuum-pumping negative-pressure model, dry sand is filled between the chilling sand box and the sand box with the vacuum-pumping negative-pressure model, a plastic film is laid, a sprue cup is placed, and finally, the operation of pouring is carried out under the condition that the operations of vacuum pumping and vibrating are simultaneously carried out. According to the casting process method combining steel-shot chilling and vibratory pouring based on the disappearing die, the circular use of the steel shots and the sand is realized, the problem of lower cooling speed of a cast in the casting of the disappearing die is thoroughly solved, the problems of bulky crystal grains, uncompacted tissues and the like, which are easy to occur in the casting of a traditional disappearing die, are avoided, the toughness and the compactness of the tissues of the cast are enhanced, the use quantity of alloy elements, such as Cr, Mo and the like, is lowered, the service life of a wear-resisting cast is ensured, the batch production of a product is realized, the rejection rate is reduced, and the manpower cost is lowered.

Description

The casting technique that combines with vibrating casting based on the shot Quench of disappearance mould

Technical field

The invention belongs to wear resistant products casting technique field, particularly a kind of casting technique that combines with vibrating casting based on the shot Quench of disappearance mould.

Background technology

Lost foam casting be with the white mould landfill of processing with EPS or STMMA copolymerization material in molding sand, pour into molten metal by cup after vacuumizing consolidation.Disappearance mould apperance is met the molten metal vaporization and is formed die cavity, and molten metal fills die cavity solidify out into foundry goods.

Lost foam casting process adopts the negative pressure of vacuum technology, and moulding is easy, and mold stiffness is good, but lost foam casting process also has its inborn weakness, promptly occur easily on the foundry goods carburetting, cooling velocity slow, organize defectives such as not fine and close.

Wear resistance castings in cement mine industry large-scale application all requires dense structure, and hardness is high, and anti-wear performance is good.This is difficult to reach the requirement of cement mine industry to wear resistance castings for traditional lost foam casting process.

Summary of the invention

The object of the invention is exactly the deficiency that will avoid lost foam casting to exist; A kind of advantages such as dry sand that can either effectively utilize the lost foam casting moulding to adopt to can be recycled are provided, can solve lost foam casting again because the vibrational casting process that the crystal grain that cooling velocity causes the slowly shot Quench based on the disappearance mould thick, that organize problem such as not fine and close combines with the negative pressure dry sand.

For this reason, technical scheme of the present invention is: based on the vibrational casting process that the shot Quench of disappearance mould combines with the negative pressure dry sand, concrete steps are following:

(1), make the bubbles model of cast product, put into drying chamber;

(2), etc. after the bubbles model oven dry in the step (1), dip coating, and put into the baking room oven dry;

(3), repeating step is (2) two to three times;

(4), the bubbles model of the good coating of the brush of having dried in the step (3) is packed in the Quench sandbox; The space is 150-300mm all around; Gap between foundry goods body ghost and the Quench sandbox 20-60 order shot of packing into, and at Quench sandbox top the clad asbestos cloth;

(6), in the sandbox of band pumped vacuum systems, to add thickness be that the dry sand of 300-450mm is rebasing, and floating;

(7), then the Quench sandbox is packed into and be with in the sandbox of pumped vacuum systems, vacuumize between the sandbox of vacuum moulding at Quench sandbox and band and fill up 20-40 purpose dry sand;

(8), paving plastic film, place cup, be lifted on the vibrating casting plain jolter, under the situation of vibration, pour into a mould at last while vacuumizing;

(9) insulation was cleared up outlet after 1-2 hour.

Beneficial effect: the present invention has sand bond height, advantage that chill effect is good; In conjunction with the supporting process characteristic such as combine of lost foam casting and shot Quench, vibrational casting, big sand buggy, cancelled the operation of the internal denseners of in the white mould of disappearance die casting, placing such as reinforcing bar, realized recycling of shot and sand; Thoroughly solved the slower problem of lost foam casting medium casting cooling velocity; Avoid the crystal grain of easy appearance in traditional lost foam casting thick, organized problems such as not fine and close, improved the toughness and the compactness of THE STRUCTURE OF CASTINGS, reduced the use amount of alloying elements such as Cr, Mo; Guaranteed the service life of wear resistance castings; Realize the mass production of product, reduce percent defective, reduced human cost.

Description of drawings

Fig. 1 is an instantiation sketch map of the present invention.

1, plain jolter pillar; 2, band vacuumizes the sandbox of negative pressure system; 3, dry sand; 4, shot; 5, bubbles model; 6, asbestos cloth; 7, Quench sandbox; 8, vacuum tube interface; 9, plain jolter table top; 10, vibrating motor; 11, air bag.

The specific embodiment

In conjunction with shown in Figure 1, based on the casting technique that the shot Quench of disappearance mould combines with vibrating casting, its concrete steps are:

(1), make the bubbles model of cast product, put into drying chamber;

(2), etc. after the bubbles model oven dry in the step (1), dip coating, and put into baking room through oven dry in about 24 hours;

(3), repeating step is (2) two to three times;

(4), the bubbles model 5 of the good coating of the brush of having dried in the step (3) is packed in the Quench sandbox 7; The space is 150-300mm all around; Gap between foundry goods body ghost and the Quench sandbox 20-60 order shot 4 of packing into, and at Quench sandbox top clad asbestos cloth 6;

(6), in the sandbox 2 of band pumped vacuum systems, to add thickness be that the dry sand 3 of 300-450mm is rebasing, and floating;

(7), then the Quench sandbox is packed into and be with in the sandbox of pumped vacuum systems, vacuumize between the sandbox of vacuum moulding at Quench sandbox and band and fill up 20-40 purpose dry sand 3;

(8) paving plastic film is placed cup, is lifted on the vibrating casting plain jolter, vacuumizes on the limit at last under the situation of (through vacuum tube interface 8) limit vibration to pour into a mould; The vacuum degree that is vacuumized during cast arrives-0.075Mpa for-0.04, and vibration frequency is that 10～120Hz, amplitude are 0.1～1.6mm;

(9) insulation was cleared up outlet after 1-2 hour.

The high chromium cast iron bar that adopts this process to produce, hardness reaches under the situation more than the HRC60 after guaranteeing heat treatment, and Cr content is reduced to 20% by original 28%; Under the situation of equal volume, product weight has increased 8-15%, dense structure, and abrasion resistance improves 20-30%.

As shown in Figure 1: the main body of vibrating casting plain jolter is made up of plain jolter pillar 1, plain jolter table top 9, vibrating motor 10, air bag 11, and the sandbox 2 of band pumped vacuum systems is fixed on the plain jolter table top 9.

The wall of described Quench sandbox 7 has ventilative grid, and the grid spacing is 3-8mm, and the length of grid is 25-60mm, and wide is 1-2mm.

Claims

1. the vibrational casting process that combines with the negative pressure dry sand based on the shot Quench of disappearance mould, concrete steps are following:

(1), make the bubbles model of cast product, put into drying chamber;

(3), repeating step is (2) two to three times;

(6), in the sandbox of band pumped vacuum systems, add the bed load of 300-450mm, and floating;

(9) insulation was cleared up outlet after 1-2 hour.

2. the casting technique that combines with vibrating casting based on the shot Quench of disappearance mould according to claim 1; It is characterized in that: the wall of said Quench sandbox has ventilative grid; The grid spacing is 3-8mm, and the length of grid is 25-60mm, and wide is 1-2mm.

3. the casting technique that combines with vibrating casting based on the shot Quench of disappearance mould according to claim 1; It is characterized in that: the vacuum degree that is vacuumized during cast arrives-0.075Mpa for-0.04, and vibration frequency is that 10～120Hz, amplitude are 0.1～1.6mm.