CN102974765B - Casting mould without riser of roller blank and casting method thereof - Google Patents
Casting mould without riser of roller blank and casting method thereof Download PDFInfo
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- CN102974765B CN102974765B CN201210492544.5A CN201210492544A CN102974765B CN 102974765 B CN102974765 B CN 102974765B CN 201210492544 A CN201210492544 A CN 201210492544A CN 102974765 B CN102974765 B CN 102974765B
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Abstract
The invention relates to a casting mould without a riser of a roller blank and a casting method of the casting mould without the riser, and belongs to roller blank manufacturing. The casting mould without the riser of the roller blank and the casting method of the casting mould without the riser are used for realizing riser elimination, material conservation and energy reduction. The casting mould is provided with a vice pressure head (1) and a main pressure head (2). In the casting, the vice pressure head (1) is positioned in the vice pressure head hole of a main pressure head cover and the vice pressure head hole of the main pressure head body. The casting method comprises the following steps of: 1) assembling the pressure heads; 2) assembling the mould; 3) installing the mould on a workbench of pressurized equipment, and starting a cooling system; 4) carrying out casting; 5) exhausting slag and air; 6) applying pressure of 2150-33900KN by utilizing the main pressure head, applying a pressure of 10-15 MPa to melt in a cavity by the vice pressure head (1), continuously adding the pressure to 80-150 MPa at the speed of 1-20MPa/min, and maintaining the pressure till the melt is completely solidified; and 7) turning off the cooling system, relieving the pressure of the vice pressure head (1) and the pressure of the main pressure head (2), loosening the connection between the moulds, cooling the blank in the cavity till the temperature of the blank is 300-500 DEG C, demoulding the mould, and naturally cooling the mould till the temperature of the mould drops to the room temperature.
Description
Technical field
The invention belongs to the manufacture of roll blank, specifically belong to the head-free casting of roll blank under impressed pressure effect.
Background technology
Roll is a large amount of consumption of metallurgical industry and indispensable large accessory, and Chinese roll annual production reaches 1,000,000 tons.Prior art, for guaranteeing casting roll interior solid, extends 300～1000mm using upper roll neck and carries out feeding as rising head, and such rising head accounts for 30% of casting roll blank weight.The diameter of this rising head is consistent with upper roll neck, must adopt the cutting of special machining process to remove, and just can re-use after then it being melted down to fusing again.That is to say, in order to produce the roll blank of 1 ton, the molten steel of 1.3 tons of left and right of necessary melting; In other words, roll factory have the rising head that is equivalent to its roll output 30% repeatedly by melting, power consumption repeatedly, scaling loss material and consume artificial.So how reducing rising head is a major issue during roll is produced always.In prior art, the method that reduces roll rising head has the heat insulation effect of strengthening riser segments to improve insulated feeder, adiabatic rising head, teeming, pumping and the electric heating rising head of riser supplement shrink efficiency, also have and emitting port part to pass to the pressure riser of Compressed Gas raising feeding pressure, but these technical measures all can only reduce the riser height of roll in certain journey, can not accomplish head-free casting.
In the Foundry Production of existing roll blank, the effect of rising head mainly contains three: feeding, collection slag, exhaust.Wherein the effect of feeding is to lean on the mobile realization of molten metal under weight-driven.In the time that the temperature of molten metal is lower, just cannot flows, thereby stop feeding.Why the rising head of existing casting roll blank is greatly that the remainder of rising head self solidifies the feeding effect that lost because wherein can be used for the molten metal of feeding under Action of Gravity Field only accounts for 30～40% of rising head volume.Insulated feeder, adiabatic rising head, teeming and electric heating rising head are exactly in fact the cooling velocity that has reduced metal in rising head, allowing to be used under Action of Gravity Field the ratio that the molten metal of feeding accounts for rising head volume improves, but because the driving force of feeding remains gravity, so must have certain liquid-column height, thereby cannot accomplish head-free casting.Pumping is that the solidified shell at rising head top is disclosed out, to utilize atmospheric pressure to continue feeding.Pressure riser is above rising head, directly to increase the air pressure below 1MPa, to improve feeding pressure, deform because air pressure cannot make the solidified shell in rising head, can only make the molten metal in rising head that certain flowing occurs, so also cannot accomplish head-free casting.
Summary of the invention
Technical problem to be solved by this invention is in eliminating rising head, saving material, reducing energy consumption, guarantees the fine and close zero defect of roll blank.
The present invention solves the technical scheme of its technical problem:
A head-free casting casting mold for roll blank, this casting mold comprises: upper roll neck casting mold shell, upper roll neck casting mold cover layer of sand, body of roll casting mold, lower roll neck casting mold and cover layer of sand, lower roll neck casting mold shell, running channel casting mold; Form the connection between the part of this casting mold:
Lower roll neck casting mold covers layer of sand and is filled in lower roll neck casting mold shell, and running channel casting mold is placed on the sprue channel open of lower roll neck casting mold and is fixing; An end face of body of roll casting mold is placed on lower roll neck casting mold hole; The center line of running channel casting mold and body of roll casting mold overlaps with the sprue channel open of lower roll neck casting mold and the center line in lower roll neck casting mold hole respectively;
Upper roll neck casting mold covers layer of sand and is filled in roll neck casting mold shell, and entirety is placed on another end face of body of roll casting mold and is fixing;
The centre bore of body of roll casting mold, upper roll neck casting mold cover lower roll neck casting mold hole that the upper hole, roll neck casting mold hole of layer of sand and lower roll neck casting mold cover layer of sand and form the whole die cavity of roll blank;
This casting mold is established: secondary pressure head and main pressure head.In pressure process, secondary pressure head is placed in the secondary pressure head hole of main pressure head lid and the secondary pressure head hole of main pressure head body, is matched in clearance therebetween;
One end of upper roll neck casting mold shell is a smooth horizontal plane, the center of horizontal plane establish the secondary pressure head hole of roll neck casting mold shell and periphery uniform on roll neck casting mold shell steam vent 12, the other end of upper roll neck casting mold shell is established a rim of the mouth;
Upper roll neck casting mold covers layer of sand and is filled in roll neck casting mold shell, and in formation, roll neck casting mold shell and upper roll neck casting mold cover layer of sand assembly; On layer of sand, establish roll neck casting mold and cover the secondary pressure head of layer of sand hole covering;
It is identical with the secondary pressure head bore dia of main pressure head lid that upper roll neck casting mold covers the secondary pressure head hole of the secondary pressure head hole of layer of sand, the secondary pressure head hole of upper roll neck casting mold shell, main pressure head body, and coaxial; It is coaxial that upper roll neck casting mold hole and upper roll neck casting mold cover the secondary pressure head of layer of sand hole;
Described main pressure head comprises: main pressure head lid, main pressure head body, roll neck side cooling water channel, roll neck side seal circle, cast gate side seal circle, cast gate side cooling water channel, roll neck side faucet, roll neck side water inlet tap, cast gate side water inlet tap, cast gate side faucet;
Main pressure head covers the secondary pressure head hole of establishing main pressure head lid, the uniform through hole of its periphery;
In the one side of main pressure head body, establish a groove, another side is established a boss; Secondary pressure head hole, cast gate side cooling water channel and two groups of water channels of roll neck side cooling water channel of in groove, establishing main pressure head body, two groups of water channel peripheries are established respectively a circular groove; Cast gate side seal circle and roll neck side seal circle are positioned over respectively in the groove of two groups of water channel peripheries;
Main pressure head lid is positioned in main pressure head body groove, main pressure head lid is fixed in main pressure head body groove with being threaded of main pressure head body by screw, the secondary pressure head hole of main pressure head lid and the secondary pressure head bore dia of main pressure head body are identical, and coaxial.
Described secondary pressure head comprises: secondary pressure head lid, secondary pressure head faucet, secondary pressure head sealing ring, secondary pressure head body, water inlet pipe, secondary pressure head water inlet tap;
Secondary pressure head covers to be established into and out of water channel, and a port of its inlet channel is connected with secondary pressure head water inlet tap, and its water outlet road junction is connected with secondary pressure head faucet, and the another port of inlet channel is fixedly connected with water inlet pipe;
Secondary pressure head lid is fixed on secondary pressure head body with being threaded of secondary pressure head body by screw, therebetween by secondary pressure head sealing ring sealing.
The lower plane of described secondary pressure head body is coated with zirconium English powder or silica flour wash.
The fit clearance in the secondary pressure head hole of the secondary pressure head hole of the secondary pressure head hole of the cylindrical of described secondary pressure head body and main pressure head lid, main pressure head body and upper roll neck casting mold shell is 0.2～0.5mm.
Described upper roll neck casting mold covers the hole depth 100～500mm in the secondary pressure head hole of layer of sand.
The riser-free casting method of the casting mold casting roll blank of right to use requirement 1, this casting method comprises the following steps:
Step 1 assembling pressure head
Main pressure head is arranged on the piston of pressurized equipment master cylinder, secondary pressure head is arranged on the piston of pressurized equipment central authorities oil cylinder;
Step 2 assembling casting mold;
Step 3 is placed in casting mold on the workbench of pressurized equipment, starts cooling system;
Step 4 cast
Be the molten metal of 1280～1650 DEG C by temperature, pour into die cavity from the sprue channel open of casting mold, it is 80～270mm that liquation is poured into the bottom surface that exceeds upper roll neck casting mold hole;
Step 5 deslagging, exhaust
Be poured and leave standstill 1～10min, make the impurity of the liquation inside in die cavity and gas float up to liquid level discharge;
Step 6 pressurization feeding
Utilize main pressure head pressurization, moulding pressure is 2150～33900KN;
Secondary pressure head directly applies 10～15Mpa pressure to the liquation in die cavity afterwards, and according to the continuous supercharging of the speed of 1～20MPa/min until reach 80～150MPa, keep this pressure until whole roll solidifies completely;
Step 7 release, slow cooling
Close cooling system, unload the pressure on secondary pressure head; Unload again the pressure on main pressure head;
Unclamp the connection forming between each of casting mold, roll blank is cooled to after 300～500 DEG C of temperature in die cavity, removes casting mold, naturally cools to room temperature in atmosphere, obtains roll blank.
Compared with the foundry engieering of existing roll blank, beneficial effect of the present invention is:
1. fully phased out rising head, saved the expense of cutting and remelting rising head, molten metal has obtained effective utilization, saves metal material, reduces production costs, and improves output;
2. main pressure head and secondary pressure head are all connected with recirculated cooling water, and temperature can not exceed 500 DEG C, and long service life also can not make the oil cylinder heating of pressurized equipment;
3. utilize pressurized equipment to drive main pressure head and secondary pressure head self-movement, order realizes and compresses casting mold and pressurization feeding, effectively prevents casting mold junction surface badly bleeding, and feeding effect stability is reliable, roll interior solid;
4. the effect of secondary pressure head breaker roll molten metal pressurization can make setting temperature improve, and degree of supercooling strengthens, and thinning microstructure improves production efficiency;
5. be poured leaving standstill of certain hour and can guarantee that casting process is mingled with and the floating of gas, exhaust can be guaranteed in the gap between secondary pressure head and main pressure head and casting mold inwall;
6. the scope of application is wide: the present invention is applicable to monoblock cast roll and the centrifugally cast composite roll of various materials and specification.
Brief description of the drawings
Fig. 1 is the head-free casting casting mold front view of roll blank.
Fig. 2 is the head-free casting casting mold top view of roll blank.
Fig. 3 is secondary pressure head front view.
Fig. 4 is secondary pressure head top view.
Fig. 5 is the A-A profile of Fig. 3.
Fig. 6 is main pressure head front view.
Fig. 7 is main pressure head top view.
Fig. 8 is the B-B cutaway view of Fig. 6.
Fig. 9 is the C-C profile of Fig. 7.
Figure 10 is the D-D profile of Fig. 7.
In figure: secondary pressure head 1, main pressure head 2, upper roll neck casting mold covers layer of sand 3, upper roll neck casting mold shell 4, body of roll casting mold 5, roll blank 6, lower roll neck casting mold covers layer of sand 7, lower roll neck casting mold shell 8, cooling medium water 9, running channel casting mold 10, running channel 11, steam vent 12, main pressure head lid 201, main pressure head body 202, roll neck side cooling water channel 203, roll neck side seal circle 204, cast gate side seal circle 205, cast gate side cooling water channel 206, roll neck side faucet 207, roll neck side water inlet tap 208, cast gate side water inlet tap 209, cast gate side faucet 210, secondary pressure head lid 101, secondary pressure head faucet 102, sealing ring 103, secondary pressure head body 104, water inlet pipe 105, secondary pressure head water inlet tap 106.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is described in further detail.
The head-free casting casting mold of roll blank, this casting mold comprises: upper roll neck casting mold covers layer of sand 3, upper roll neck casting mold shell 4, body of roll casting mold 5, lower roll neck casting mold and covers layer of sand 7, lower roll neck casting mold shell 8, running channel casting mold 10; Form the connection between the part of this casting mold:
Lower roll neck casting mold covers layer of sand 7 and is filled in lower roll neck casting mold shell 8, and running channel casting mold 10 is placed on the sprue channel open of lower roll neck casting mold and is fixing; An end face of body of roll casting mold 5 is placed on lower roll neck casting mold hole; The center line of running channel casting mold 10 and body of roll casting mold 5 overlaps with the sprue channel open of lower roll neck casting mold and the center line in lower roll neck casting mold hole respectively;
The assembly that upper roll neck casting mold covers layer of sand 3 and upper roll neck casting mold shell 4 is placed on another end face of body of roll casting mold 5;
The centre bore of body of roll casting mold 5, upper roll neck casting mold cover the upper roll neck hole of layer of sand 3, lower roll neck casting mold and cover the lower roll neck casting mold hole of layer of sand 7 and form die cavity; It is characterized in that:
Described casting mold comprises: secondary pressure head 1 and main pressure head 2; In pressure process, secondary pressure head is placed in the secondary pressure head hole of main pressure head lid and the secondary pressure head hole of main pressure head body, is matched in clearance therebetween;
Upper roll neck casting mold shell 4 is made up of steel or cast iron, its one end is a smooth horizontal plane, establish on the secondary pressure head hole of roll neck casting mold shell and periphery thereof and establish roll neck casting mold shell steam vent in the center of horizontal plane, the other end of upper roll neck casting mold shell 4 is established a rim of the mouth;
Upper roll neck casting mold covers layer of sand 3 and is filled in roll neck casting mold shell 4, and in formation, roll neck casting mold shell and upper roll neck casting mold cover layer of sand assembly; On layer of sand 3, establish roll neck casting mold and cover the secondary pressure head of layer of sand hole covering;
It is identical with the secondary pressure head bore dia of main pressure head lid that upper roll neck casting mold covers the secondary pressure head hole of the secondary pressure head hole of layer of sand 3, the secondary pressure head hole of upper roll neck casting mold shell 4, main pressure head body, and coaxial; It is coaxial that upper roll neck casting mold hole and upper roll neck casting mold cover the secondary pressure head of layer of sand hole;
The end face in the upper roll neck casting mold hole of described assembly is positioned on the other end of body of roll casting mold 5, and upper roll neck casting mold shell 4 agrees with body of roll casting mold 5; Upper roll neck casting mold cover layer of sand 3, upper roll neck casting mold shell 4 and lower roll neck casting mold cover layer of sand 7 lower roll eck center line overlap;
, set roll neck casting mold shell steam vent at the end of described lower roll neck casting mold shell 8.
Described main pressure head 2 comprises: main pressure head lid 201, main pressure head body 202, roll neck side cooling water channel 203, roll neck side seal circle 204, cast gate side seal circle 205, cast gate side cooling water channel 206, roll neck side faucet 207, roll neck side water inlet tap 208, cast gate side water inlet tap 209, cast gate side faucet 210;
On main pressure head lid 201, establish the secondary pressure head hole of main pressure head lid, the uniform through hole of its periphery;
In the one side of main pressure head body 202, establish a groove, another side is established a boss; Secondary pressure head hole, cast gate side cooling water channel 206 and 203 liang of group water channels of roll neck side cooling water channel of in groove, establishing main pressure head body, two groups of water channel peripheries are established respectively a circular groove; Cast gate side seal circle 205 and roll neck side seal circle 204 are positioned over respectively in the groove of two groups of water channel peripheries; Roll neck side cooling water channel 203 is the groove being communicated with around secondary pressure head Kong tri-roads of main pressure head body.
Main pressure head lid 201 is positioned in main pressure head body 202 grooves, main pressure head lid 201 is fixed in main pressure head body 202 grooves with being threaded of main pressure head body 202 by screw, the secondary pressure head hole of main pressure head lid and the secondary pressure head bore dia of main pressure head body are identical, and coaxial.
Described secondary pressure head 1 comprises: secondary pressure head lid 101, secondary pressure head faucet 102, secondary pressure head sealing ring 103, secondary pressure head body 104, water inlet pipe 105, secondary pressure head water inlet tap 106;
On secondary pressure head lid 101, establish into and out of water channel, a port of its inlet channel is connected with secondary pressure head water inlet tap 106, and its water outlet road junction is connected with secondary pressure head faucet 102, and the another port of inlet channel is fixedly connected with water inlet pipe 105;
Secondary pressure head lid 101 is fixed on secondary pressure head body 104 with being threaded of secondary pressure head body 104 by screw, seals by secondary pressure head sealing ring 103 therebetween.
The lower plane of described secondary pressure head body 104 is coated with zirconium English powder or silica flour.
The fit clearance in the secondary pressure head hole of the secondary pressure head hole of the secondary pressure head hole of the cylindrical of described secondary pressure head body 104 and main pressure head lid, main pressure head body and upper roll neck casting mold shell is 0.2～0.5mm, and the arbitrary value of getting between its 0.2mm or 0.5mm or 0.2～0.5mm all can.。
Described upper roll neck casting mold covers the hole depth 100～500mm in the secondary pressure head hole of layer of sand, and the arbitrary value of getting between its 100mm or 500mm or 100～500mm all can.
Described main pressure head 2 is formed from steel, and secondary pressure head 1 is made up of hot die steel.
Cooling system comprises: water tank, water pump, pipeline, cooling medium water 9.
Water pump is positioned in water tank, and the outlet pipe of water pump is connected respectively with secondary pressure head water inlet tap 106 with the outlet pipe of cast gate side water inlet tap 209, water pump and the outlet pipe of roll neck side water inlet tap 208, water pump; Cast gate side faucet 210, roll neck side faucet 207, secondary pressure head faucet 102 are communicated with water tank by pipeline respectively.Cooling water pressure 0.1～0.2MPa, flow 60～1000L/h.
Roll material is one of casting method without rising head of the roll blank of spheroidal graphite cast-iron (integral cast method), and this casting method comprises the following steps:
Step 1 assembling pressure head
Main pressure head 2 is arranged on the piston of pressurized equipment master cylinder, secondary pressure head 1 is arranged on the piston of pressurized equipment central authorities oil cylinder;
Step 2 assembling casting mold
Step 3
Casting mold is placed on the workbench of pressurized equipment, starts cooling system;
Step 4 cast
Be the spheroidal graphite cast-iron liquation of 1280 DEG C by temperature, pour into die cavity from the sprue channel open of casting mold, it is 80mm that liquation is poured into the bottom surface that exceeds upper roll neck casting mold hole;
Step 5 deslagging, exhaust
Be poured and leave standstill 1min, make the impurity of the spheroidal graphite cast-iron liquation inside in die cavity and gas float up to liquid level discharge;
Step 6 pressurization feeding
Utilize main pressure head 2 to pressurize, moulding pressure is 2150KN; When the object of pressurization is effectively to prevent from pressurizeing subsequently feeding, upper roll neck casting mold separates with the junction of body of roll casting mold, causes roll molten metal to spray outward;
Secondary pressure head 1 directly applies the pressure of 10MPa to the molten metal in die cavity afterwards, and according to the continuous supercharging of the speed of 1MPa/min until reach 80MPa, dwell time 5.6min, until whole roll solidifies completely.Both feeding in time, can save again energy consumption.
Step 7 release, slow cooling
Close cooling system.Unload the pressure on secondary pressure head (1), shift out from the secondary pressure head hole of main pressure head lid and the secondary pressure head hole of main pressure head body by secondary pressure head 1, separate by main pressure head 2 and casting mold; Unload again the pressure on main pressure head 2, separate by main pressure head 2 and casting mold.
Unclamp the connection forming between each of casting mold, roll blank 6 is cooled to after 400 DEG C of temperature in die cavity, removes casting mold, naturally cools to room temperature in atmosphere, obtains roll blank 6.
Roll material is two (the rinsing composite casting method) of rinsing the casting method without rising head of the roll blank of compound magnesium iron, and this casting method comprises the following steps:
Step 1 assembling pressure head
Main pressure head 2 is arranged on the piston of pressurized equipment master cylinder, secondary pressure head 1 is arranged on the piston of pressurized equipment central authorities oil cylinder;
Step 2 assembling casting mold
Step 3 is placed in casting mold on the workbench of pressurized equipment, starts cooling system;
Step 4 cast
Be the spheroidal graphite cast-iron liquation of 1350 DEG C by temperature, pour into die cavity from the sprue channel open of casting mold, it is 169mm that liquation is poured into the bottom surface that exceeds upper roll neck casting mold hole;
Step 5 deslagging, exhaust
Be poured and leave standstill 7min, make the impurity of the spheroidal graphite cast-iron liquation inside in die cavity and gas float up to liquid level discharge;
Step 6 pressurization feeding
Utilize main pressure head 2 to pressurize, moulding pressure is 14377KN; When the object of pressurization is effectively to prevent from pressurizeing subsequently feeding, upper roll neck casting mold separates with the junction of body of roll casting mold, causes roll molten metal to spray outward;
Secondary pressure head 1 directly applies the pressure of 13MPa to the molten metal in die cavity afterwards, and according to the continuous supercharging of the speed of 12MPa/min until reach 120MPa, dwell time 14.8min, until whole roll solidifies completely.Both feeding in time, can save again energy consumption.
Step 7 release, slow cooling
Close cooling system.Unload the pressure on secondary pressure head (1), shift out from the secondary pressure head hole of main pressure head lid and the secondary pressure head hole of main pressure head body by secondary pressure head 1, separate by main pressure head 2 and casting mold; Unload again the pressure on main pressure head 2, separate by main pressure head 2 and casting mold.
Unclamp the connection forming between each of casting mold, roll blank 6 is cooled to after 300 DEG C of temperature in die cavity, removes casting mold, naturally cools to room temperature in atmosphere, obtains roll blank 6.
Three of the casting method without rising head of composite high-speed steel roller blank, this casting method comprises the following steps:
Step 1 assembling pressure head
Main pressure head 2 is arranged on the piston of pressurized equipment master cylinder, secondary pressure head 1 is arranged on the piston of pressurized equipment central authorities oil cylinder;
Step 2 assembling casting mold
Step 3 is placed in casting mold on the workbench of pressurized equipment, starts cooling system;
The steel bushing that is high-speed steel by body of roll cladding material is placed in the centre bore of body of roll casting mold; The external diameter of the steel bushing of high-speed steel is identical with the diameter of the centre bore of body of roll casting mold;
Step 4 cast
Be the cast steel liquation of 1650 DEG C by temperature, pour into die cavity from the sprue channel open of casting mold, it is 270mm that liquation is poured into the bottom surface that exceeds upper roll neck casting mold hole;
Step 5 deslagging, exhaust
Be poured and leave standstill 10min, make the impurity of the spheroidal graphite cast-iron liquation inside in die cavity and gas float up to liquid level discharge;
Step 6 pressurization feeding
Utilize main pressure head 2 to pressurize, moulding pressure is 33900KN; When the object of pressurization is effectively to prevent from pressurizeing subsequently feeding, upper roll neck casting mold separates with the junction of body of roll casting mold, causes roll molten metal to spray outward;
Secondary pressure head 1 directly applies the pressure of 15MPa to the molten metal in die cavity afterwards, and according to the continuous supercharging of the speed of 20MPa/min until reach 150MPa, dwell time 23.2min, until whole roll solidifies completely.Both feeding in time, can save again energy consumption.
Step 7 release, slow cooling
Close cooling system.Unload the pressure on secondary pressure head 1, shift out from the secondary pressure head hole of main pressure head lid and the secondary pressure head hole of main pressure head body by secondary pressure head 1, separate by main pressure head 2 and casting mold; Unload again the pressure on main pressure head 2, separate by main pressure head 2 and casting mold.
Unclamp the connection forming between each of casting mold, roll blank 6 is cooled to after 500 DEG C of temperature in die cavity, removes casting mold, naturally cools to room temperature in atmosphere, obtains roll blank 6.
Claims (5)
1. a head-free casting casting mold for roll blank, this casting mold comprises: upper roll neck casting mold covers layer of sand (3), body of roll casting mold (5), lower roll neck casting mold and covers layer of sand (7), lower roll neck casting mold shell (8), running channel casting mold (10), pressure head; Form the connection between the part of this casting mold:
Lower roll neck casting mold covers layer of sand (7) and is filled in lower roll neck casting mold shell (8), and running channel casting mold (10) is placed on the sprue channel open of lower roll neck casting mold and is fixing; An end face of body of roll casting mold (5) is placed on lower roll neck casting mold hole; The center line of running channel casting mold (10) and body of roll casting mold (5) overlaps with the sprue channel open of lower roll neck casting mold and the center line in lower roll neck casting mold hole respectively;
Upper roll neck casting mold covers on another end face that layer of sand (3) is placed in body of roll casting mold (5);
The centre bore of body of roll casting mold, upper roll neck casting mold cover the upper roll neck hole of layer of sand, lower roll neck casting mold and cover the lower roll neck casting mold hole of layer of sand and form die cavity;
Pressure head comprises: secondary pressure head (1) and main pressure head (2); In pressure process, secondary pressure head is placed in the secondary pressure head hole of main pressure head lid and the secondary pressure head hole of main pressure head body, is matched in clearance therebetween;
One end of upper roll neck casting mold shell (4) is a smooth horizontal plane, the center of horizontal plane establish the secondary pressure head hole of roll neck casting mold shell and periphery uniform on roll neck casting mold shell steam vent (12), the other end of upper roll neck casting mold shell (4) is established a rim of the mouth;
Upper roll neck casting mold covers layer of sand (3) and is filled in roll neck casting mold shell (4), and entirety is placed on another end face of body of roll casting mold and is fixing; On layer of sand (3), establish upper roll neck casting mold and cover the secondary pressure head of layer of sand hole covering;
It is identical with the secondary pressure head bore dia of main pressure head lid that upper roll neck casting mold covers the secondary pressure head hole of the secondary pressure head hole of layer of sand, the secondary pressure head hole of upper roll neck casting mold shell, main pressure head body, and coaxial; It is coaxial that upper roll neck casting mold hole and upper roll neck casting mold cover the secondary pressure head of layer of sand hole;
It is characterized in that:
Described main pressure head (2) comprising: main pressure head lid (201), main pressure head body (202), roll neck side cooling water channel (203), roll neck side seal circle (204), cast gate side seal circle (205), cast gate side cooling water channel (206), roll neck side faucet (207), roll neck side water inlet tap (208), cast gate side water inlet tap (209), cast gate side faucet (210);
On main pressure head lid (201), establish the secondary pressure head hole of main pressure head lid, the uniform through hole of its periphery;
In the one side of main pressure head body (202), establish a groove, another side is established a boss; Secondary pressure head hole, cast gate side cooling water channel (206) and (203) two groups of water channels of roll neck side cooling water channel of in groove, establishing main pressure head body, two groups of water channel peripheries are established respectively a circular groove; Cast gate side seal circle (205) and roll neck side seal circle (204) are positioned over respectively in the groove of two groups of water channel peripheries;
Main pressure head lid (201) is positioned in main pressure head body (202) groove, main pressure head lid (201) is fixed in main pressure head body (202) groove with being threaded of main pressure head body (202) by screw, the secondary pressure head hole of main pressure head lid and the secondary pressure head bore dia of main pressure head body are identical, and coaxial;
Described secondary pressure head (1) comprising: secondary pressure head lid (101), secondary pressure head faucet (102), secondary pressure head sealing ring (103), secondary pressure head body (104), water inlet pipe (105), secondary pressure head water inlet tap (106);
On secondary pressure head lid (101), establish into and out of water channel, one port of its inlet channel is connected with secondary pressure head water inlet tap (106), its water outlet road junction is connected with secondary pressure head faucet (102), and the another port of inlet channel is fixedly connected with water inlet pipe (105);
By screw and being threaded of secondary pressure head body (104), secondary pressure head lid (101) is fixed on to secondary pressure head body (104) upper, therebetween by secondary pressure head sealing ring (103) sealing.
2. the head-free casting casting mold of roll blank according to claim 1, is characterized in that:
The lower plane of described secondary pressure head body (104) is coated with zirconium English powder or silica flour.
3. the head-free casting casting mold of roll blank according to claim 1, is characterized in that:
The fit clearance in the secondary pressure head hole of the cylindrical of described secondary pressure head body (104) and the secondary pressure head hole of main pressure head lid, main pressure head body and the secondary pressure head hole of upper roll neck casting mold shell is 0.2～0.5mm.
4. the head-free casting casting mold of roll blank according to claim 1, is characterized in that:
Described upper roll neck casting mold covers the hole depth 100～500mm in the secondary pressure head hole of layer of sand.
5. the riser-free casting method of the casting mold casting roll blank of right to use requirement 1, this casting method bag
Draw together following steps:
Step 1 assembling pressure head
Main pressure head (2) is arranged on the piston of pressurized equipment master cylinder, secondary pressure head (1) is arranged on the piston of pressurized equipment central authorities oil cylinder,
Step 2 assembling casting mold
Step 3 is placed in casting mold on the workbench of pressurized equipment, starts cooling system;
Step 4 cast
Be the molten metal of 1280～1650 DEG C by temperature, pour into die cavity from the sprue channel open of casting mold, it is 80～270mm that liquation is poured into the bottom surface that exceeds upper roll neck casting mold hole;
Step 5 deslagging, exhaust
Be poured and leave standstill 1～10min, make the impurity of the liquation inside in die cavity and gas float up to liquid level discharge;
Step 6 pressurization feeding
Utilize main pressure head (2) pressurization, moulding pressure is 2150～33900KN;
Secondary pressure head (1) directly applies 10～15Mpa pressure to the liquation in die cavity afterwards, and according to the continuous supercharging of the speed of 1～20MPa/min until reach 80～150MPa, keep this pressure until whole roll solidifies completely;
Step 7 release, slow cooling
Close cooling system, unload the pressure on secondary pressure head (1); Unload again the pressure on main pressure head (2);
Unclamp the connection forming between each of casting mold, roll blank (6) is cooled to after 300～500 DEG C of temperature in die cavity, removes casting mold, naturally cools to room temperature in atmosphere, obtains roll blank (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| JPS57175055A (en) * | 1981-04-02 | 1982-10-27 | Donepuropetorofusukii Oorudena | Prefabricated mold for manufacturing rolling roll |
| CN1597180A (en) * | 2004-08-02 | 2005-03-23 | 中国科学院金属研究所 | Integral easting method of cast steel supporting roller |
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| CN102240795A (en) * | 2011-07-20 | 2011-11-16 | 北京交通大学 | Method for casting brake bottom plate blank for automobile, and casting mold used by method |
| CN102554129A (en) * | 2011-12-26 | 2012-07-11 | 常州凯达重工科技有限公司 | Roll casting process and pouring device adopted by same |
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| JPS57175055A (en) * | 1981-04-02 | 1982-10-27 | Donepuropetorofusukii Oorudena | Prefabricated mold for manufacturing rolling roll |
| CN1597180A (en) * | 2004-08-02 | 2005-03-23 | 中国科学院金属研究所 | Integral easting method of cast steel supporting roller |
| CN101028647A (en) * | 2007-03-16 | 2007-09-05 | 中国科学院金属研究所 | Method for casting super-large composite-material caststeel bearing roller above 100 ton |
| CN101954469A (en) * | 2010-06-29 | 2011-01-26 | 北京交通大学 | Manufacturing method of bucket tooth and applied mould thereof |
| CN102240795A (en) * | 2011-07-20 | 2011-11-16 | 北京交通大学 | Method for casting brake bottom plate blank for automobile, and casting mold used by method |
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| CN102974765A (en) | 2013-03-20 |
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