CN102049494A - Casting method of aluminum-magnesium alloy movable coil for vibrating table - Google Patents

Abstract

The invention relates to a casting method of an alloy workpiece and discloses a casting method of an aluminum-magnesium alloy movable coil for a vibrating table. The method comprises the following steps of: 1, making preparations for pouring; 2, smelting and pouring; and 3, performing sand casting and gravity pouring, shaping an upper box, a middle box and a lower box, performing alloy smelting by a solvent method and performing gravity pouring. By the method, casting of the aluminum-magnesium alloy movable coil with a large and special structure is realized and various indexes meet design requirements; and the method has the advantages that: a casting does not have cracks and shrinkage cavities, has high quality and the like.

Description

Shake table almag moving-coil casting method

Technical field

The present invention relates to the casting method of alloy workpiece, particularly a kind of casting method of electric vibration table almag moving-coil.

Background technology

Electric vibration table is a kind of equipment that product or parts is carried out the vibration simulation test, resistance to shock by a product of test evaluation, for examining this product quality that correct foundation is provided, therefore, be widely used in space flight, aviation, boats and ships, automobile, electronics, household electrical appliances and instrument and meter industry.Along with science and technology development, the thrust and the frequency of vibration test instrument improve constantly, the structure of " the heart "-moving-coil of vibration instrumentation becomes increasingly complex, part is also done bigger and bigger, develop into two-layer (middle one deck dividing plate that increases) structure by original single layer structure, external diameter increases to ￠ 850mm by ￠ 150mm～￠ 500mm, its alloy material that adopts is generally cast magnesium alloy or Birmasil, wherein cast almag-ZL302, because of bearing high impact load, good processing characteristics and lower characteristics such as cost form and are preferred material, but the casting character of this material is relatively poor, and the change of its structure and size has further strengthened the casting difficulty.

The casting character of ZL302 alloy: it is general with hot cracking tendency to flow, and easily forms scattered porosity, and shrinkage factor is big, and air-tightness is low, and air-breathing tendency is big; Higher owing to magnesium content again, the alloy melting complexity.The change of casting structure and size makes foundry goods before running channel and the easier generation shrinkage cavity in thermal center place, shrinkage defect, if casting Technology Design is improper, foundry goods very easily produces shrinkage cavity, loosens, is mingled with and crack defect.

Do not find at present the explanation or the report of technology similar to the present invention, do not collect both at home and abroad similarly data as yet yet.

Summary of the invention

Very easily produce the foundry goods shrinkage cavity in order to solve existing casting method, loosen, be mingled with and problem such as crack defect, the object of the present invention is to provide a kind of shake table almag moving-coil casting method.Utilize the present invention, can satisfy a kind of production of large-scale almag foundry goods-moving-coil of special construction.

In order to reach the foregoing invention purpose, the technical scheme that the present invention is adopted for its technical problem of solution provides a kind of shake table almag moving-coil casting method, comprises the steps:

Preparation before step 1, the cast; Casting method is sand casting, and gravity-assist pouring is divided into upper, middle and lower three-cavity moulding (see figure 1);

Step 2, smelting and pouring; Comprise that alloy melting adopts flux method, gravity-assist pouring.

Shake table almag moving-coil casting method of the present invention, owing to take above-mentioned technological measure, realized the casting of the almag moving-coil of large-scale, special construction, its every index all reaches designing requirement, has obtained foundry goods flawless, no shrinkage cavity defect, beneficial effect such as superior in quality.

Description of drawings

Fig. 1, Fig. 2, Fig. 3 are structure chart and the foundary methods drawings of using the jigging platform moving coil of the inventive method manufacturing.

Fig. 1 is the front view of jigging platform moving coil

Fig. 2 is the vertical view of jigging platform moving coil;

Fig. 3 is the upward view of jigging platform moving coil.

Accompanying drawing sign: 1-casting in open amount 2,4-rising head 3-top box 5,6-chill 7-slit running channel 8-screen pack 9, muscle 22-bottom, 10-die joint 21-top muscle 23-plug 24-central dividing plate

The specific embodiment

Below in conjunction with description of drawings the preferred embodiments of the present invention.

Fig. 1～Fig. 3 is structure chart and an artwork of using the jigging platform moving coil of the inventive method manufacturing.Fig. 1 is the front view of jigging platform moving coil; Fig. 2 is the vertical view of jigging platform moving coil; Fig. 3 is the upward view of jigging platform moving coil.

Shown in above accompanying drawing, the overall size of the almag moving coil framework of the maximum of desire employing the inventive method casting is: ￠ 850 * 610 (mm), its center have to around 8 reinforcements of homogeneous radiation, be divided into two parts up and down, have dividing plate 24 between two parts reinforcement, the width of top muscle 21 is that the width of 32mm (see figure 2), bottom muscle 22 is the 28mm (see figure 3); Has middle plug 23 in the center of moving coil framework.

Above-mentioned foundry goods requires casting flaws such as no shrinkage cavity, crackle, cold shut, and shake table almag moving-coil casting method of the present invention is taked following processing step according to above-mentioned requirements:

Preparation before step 1, the cast

Before the cast, following measure has been taked in technological design:

1.1 casting method is sand casting, gravity-assist pouring is divided into upper, middle and lower three-cavity moulding (see figure 1);

1.2 the plane is provided with casting in open amount 1 as allowance on foundry goods, the allowance on last plane plays the feeding effect of rising head;

1.3 top muscle 21 and bottom muscle 22, and feeding head 4,2 all is set on the middle plug 23, open riser (teeming rising head) is set on top box 3, strengthen the feeding effect of rising head;

1.4 running gate system adopts the slit running channel, on the opposite of eight muscle eight slit running channels 7 is set, slit running channel 7 flushes with feeding head 4, and rising head is connected with the slit: the slit running channel can make alloy liquid flow steadily, and heat distribution is reasonable; Rising head is connected with the slit, has both helped feeding, helps scum silica frost again;

Though 1.5 that the slit running channel fills type is steady, heat distribution is reasonable because the thermal shock of alloy liquid, near the slit or the opposite easily produce defectives such as shrinkage porosite and crackle.For this reason, No2#, No3# chill 6 are set before slit running channel 7, thickness is 25mm, strengthens the Quench of the preceding alloy of slit running channel;

1.6 around middle plug 23 No1# chill 5 is set, thickness is 40mm;

1.7 before slit running channel 7, be provided with screen pack 8: before screen pack is placed on the slit running channel, fully pushing off the slag;

1.8 totally nine of above feeding heads, according to the width of muscle and the thermal center diameter of middle plug, rising head size specific design is:

Middle plug place rising head: ￠ 150 * 200 (descending), gradient: 6 °

The rising head at top muscle 21 and bottom muscle 22 places: 200 * 40 * 200 (descending),

Width gradient: 6 °

1.9 according to the height of top muscle and the thickness of central dividing plate, casting in open amount 1 is designed to 30mm.

Step 2, smelting and pouring; Further comprise following step:

Alloy melting adopts flux method, gravity-assist pouring

2.1 batching: the magnesium amount is calculated with 6.5%, and all the other are the aluminium amount, check Fe, Si content;

2.2 it is reinforced: as crucible to be heated to 600 ℃～650 ℃, in crucible, to add furnace charge, reinforced order: the foundry returns → aluminium ingot of the foundry returns → remelting of remelting not;

2.3 heat up: add magnesium ingot with the fusing of alloy liquid and when being warming up to 690 ℃～700 ℃;

2.4 refining: carry out refining with agitator when alloy liquid is heated to 660 ℃～680 ℃.Method of refining:

Vertical direction is sharply stirred up and down.The stirring time is to occur as the minute surface till the light to the alloy liquid level in 5 minutes～8 minutes.Its temperature of whole fusion process must not be above 700 ℃;

2.5 leave standstill: alloy liquid is warming up to 720 ℃, leaves standstill cast after 8 minutes～10 minutes;

2.6 cast: pouring temperature is 690 ℃～700 ℃, the cooling cast;

2.7 teeming rising head: when alloy liquid rises to rising head 1/3rd height, with 710 ℃ of alloy liquid teeming rising heads.In the rising head process of setting, again with 710 ℃ of alloy liquid teeming rising heads 2～3 times.

Claims (1)

1. a shake table almag moving-coil casting method is characterized in that this method comprises the steps:

Preparation before step 1, the cast;

1.1 casting method is sand casting, gravity-assist pouring is divided into the upper, middle and lower three-cavity moulding;

1.2 the plane is provided with casting in open amount 1 as allowance on foundry goods, the allowance on last plane plays the feeding effect of rising head;

1.3 top muscle 21 and bottom muscle 22, and feeding head 4,2 all is set on the middle plug 23, open riser (teeming rising head) is set on top box 3, strengthen the feeding effect of rising head;

1.4 running gate system adopts the slit running channel, on the opposite of eight muscle eight slit running channels 7 is set, slit running channel 7 flushes with feeding head 4, and rising head is connected with the slit: the slit running channel can make alloy liquid flow steadily, and heat distribution is reasonable; Rising head is connected with the slit, has both helped feeding, helps scum silica frost again;

Though 1.5 that the slit running channel fills type is steady, heat distribution is reasonable because the thermal shock of alloy liquid, near the slit or the opposite easily produce defectives such as shrinkage porosite and crackle.For this reason, No2#, No3# chill 6 are set before slit running channel 7, thickness is 25mm, strengthens the Quench of the preceding alloy of slit running channel;

1.6 around middle plug 23 No1# chill 5 is set, thickness is 40mm;

1.7 before slit running channel 7, be provided with screen pack 8: before screen pack is placed on the slit running channel, fully pushing off the slag;

1.8 totally nine of above feeding heads, according to the width of muscle and the thermal center diameter of middle plug, rising head size specific design is:

Middle plug place rising head: ￠ 150 * 200 (descending), gradient: 6 °

The rising head at top muscle 21 and bottom muscle 22 places: 200 * 40 * 200 (descending),

Width gradient: 6 °

1.9 according to the height of top muscle and the thickness of central dividing plate, casting in open amount 1 is designed to 30mm.Step 2, smelting and pouring; Further comprise following step:

2.1 batching: the magnesium amount is calculated with 6.5%, and all the other are the aluminium amount, check Fe, Si content;

2.2 reinforced: as crucible to be heated to 600 ℃～650 ℃, in crucible, to add furnace charge, reinforced order:

Foundry returns → the aluminium ingot of the foundry returns → remelting of remelting not;

2.3 heat up: add magnesium ingot with the fusing of alloy liquid and when being warming up to 690 ℃～700 ℃;

2.4 refining: carry out refining with agitator when alloy liquid is heated to 660 ℃～680 ℃.Method of refining: vertical direction is sharply stirred up and down.The stirring time is to occur as the minute surface till the light to the alloy liquid level in 5 minutes～8 minutes.Its temperature of whole fusion process must not be above 700 ℃;

2.5 leave standstill: alloy liquid is warming up to 720 ℃, leaves standstill cast after 8 minutes～10 minutes;

2.6 cast: pouring temperature is 690 ℃～700 ℃, the cooling cast;

2.7 teeming rising head: when alloy liquid rises to rising head 1/3rd height, with 710 ℃ of alloy liquid teeming rising heads, in the rising head process of setting, again with 710 ℃ of alloy liquid teeming rising heads 2～3 times.

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