CN113145803A - Iron mold sand-lined casting process with core making function and sand-lined mold thereof - Google Patents

Abstract

The invention provides an iron mold sand-lined casting process with a core making function and a sand-lined mold thereof.A profile mold comprises a mold base plate, wherein the mold base plate comprises a casting male mold, a profile mold sand core head seat and a profile film sand core cavity; the iron mold comprises a casting cavity, an iron core cavity and an iron core seat cavity, wherein iron core cavity and iron core seat cavity are arranged at two ends of the plurality of iron core cavities, the casting cavity and the iron core cavity are respectively provided with a perforation, the outer mold and the iron mold are butted to form a precoated sand cavity between the casting male mold and the casting cavity, and a sand core cavity is formed between the outer mold core cavity and the iron core cavity. The invention can prepare the outer die cavity and the sand core of the iron mold precoated sand at the same time, saves the core box manufacturing process, and has low die cost and high production efficiency.

Description

Iron mold sand-lined casting process with core making function and sand-lined mold thereof

Technical Field

The invention belongs to the technical field of casting, and particularly relates to an iron mold sand-lined casting process with a core making function and a sand-lined mold thereof.

Background

The molding process of the sand-lined metal mold technology is to heat the metal mold and the mold to reach the curing temperature of the precoated sand, so as to obtain a precoated sand layer casting mold with a certain thickness. The traditional sand lined metal mold process only prepares an outer mold, and for a sand core, the sand core needs to be prepared by a hot core box or a cold core box, so that a core box tool needs to be manufactured besides the sand lined metal mold outer mold and a metal mold tool, the appearance modeling and the sand core preparation need to be independently arranged at the same time in production and production scheduling, the process is complicated, and the production efficiency is low.

Disclosure of Invention

In order to solve the technical problems, the invention provides an iron mold sand-lined casting process and a sand-lined mold thereof, which can prepare a sand core while preparing an outer mold, and do not need to additionally manufacture a core box and have a core making function, and the specific scheme is as follows:

the sand-lined metal mold with the core making function comprises an outer mold and an iron mold, wherein the outer mold comprises a mold base plate, the mold base plate comprises a casting male mold, an outer mold sand core head seat and an outer mold sand core cavity, two sides of the plurality of casting male molds are respectively connected with the outer mold sand core head seat, and two ends of the plurality of outer mold sand core cavities are respectively provided with the outer mold sand core head cavity; the iron mold comprises a casting cavity corresponding to the casting male mold, an iron mold core cavity corresponding to the outline mold core cavity and an iron mold core head seat cavity corresponding to the outline mold core head seat, wherein the two ends of the iron mold core cavities are respectively provided with the iron mold core head cavities corresponding to the outline mold core head cavities, the casting cavity and the iron mold core cavities are respectively provided with a perforation, the outline mold and the iron mold are butted to form a precoated sand cavity between the casting male mold and the casting cavity, and the sand core cavity is formed between the outline mold core cavity and the iron mold core cavity.

Further, still include swage travelling bogie, swage travelling bogie includes automobile body, wheel, psammitolite ejector pin and swage supporting shoe, and a plurality of wheels are installed respectively in automobile body bottom, and a plurality of swage supporting shoes evenly establish respectively in automobile body top both sides, and many psammitolite ejector pins correspond the perforation position of swage psammitolite die cavity respectively and install at the automobile body top, the swage both ends are equipped with swage locating pin hole respectively, are equipped with the dolly locating pin that corresponds with swage locating pin hole on the automobile body top, and the swage passes the dolly locating pin through swage locating pin hole activity and fixes at the automobile body top, and many psammitolite ejector pins penetrate the corresponding swage psammitolite die cavity perforation respectively and ejecting the psammitolite that will make from the swage.

Furthermore, the die bottom plate further comprises a metallographic test block male die, a mechanical test block male die and a pouring system male die, the metallographic test block male die, the mechanical test block male die and the pouring system male die are respectively connected with the casting male die, and two ends of the die bottom plate are respectively provided with an external die positioning pin hole.

Furthermore, the iron mold also comprises a metallographic test block cavity corresponding to the metallographic test block male die, a mechanical test block cavity corresponding to the mechanical test block male die and a gating system cavity corresponding to the gating system male die, wherein the metallographic test block cavity, the mechanical test block cavity and the gating system cavity are respectively connected with the casting cavity, iron mold supporting seats are respectively arranged on two sides of the iron mold, and hanging shafts are respectively arranged at two ends of the iron mold.

The iron mold sand-lined casting process using the iron mold sand-lined mold with the core making function comprises the following steps of:

(1) when shooting sand and molding, butting an iron mold and an external mold to form a film-coated sand cavity and a sand core cavity;

(2) respectively injecting precoated sand into the precoated sand chamber and the sand core cavity in the step (1) through perforation, lowering an outer form die after heating and curing, separating the outer form die from an iron mold, adhering the cured precoated sand to the iron mold, leaving a sand core on the iron mold sand core cavity along with the iron mold, and simultaneously preparing the precoated sand outer form die cavity and the sand core integrated with the iron mold after stripping;

(3) turning over the iron mold with the molded back facing downwards, transferring the iron mold to an iron mold transport trolley, wherein sand core ejector rods on the iron mold transport trolley respectively movably penetrate through the perforations on the iron mold sand core cavity, and ejecting the manufactured sand core out of the iron mold;

(4) and (4) finishing the sand core, and putting the sand core on a sand core head seat of the appearance mold to finish core loading.

THE ADVANTAGES OF THE PRESENT INVENTION

1. The invention utilizes the sand-lined metal mold casting process with the core making function and the sand-lined mold thereof, and uses a set of sand-lined metal mold host equipment, so as to simultaneously prepare the sand-lined metal mold cavity and the sand core integrated with the metal mold.

2. The invention utilizes the iron mold sand-lined casting process with the core making function and the sand-lined mold thereof, has low energy consumption and cost, can ensure that the temperature of the external mold is consistent with that of the sand core, avoids the risk of casting air holes caused by water condensation at the cold sand core due to the occurrence of the conditions of heating the external mold and the cold sand core, and can quickly solidify the adhesive for the sand core needing the adhesive by utilizing the common temperature of the external mold and the sand core, thereby improving the core installing efficiency.

Drawings

FIG. 1 is a schematic view of the butt joint of iron molds and external molds according to the present invention.

Fig. 2 is a schematic structural view of the outer mold of fig. 1.

Fig. 3 is a schematic structural view of the iron mold of fig. 1.

Fig. 4 is a schematic view of the connection structure of the iron-type and iron-type transport trolley of the invention.

Fig. 5 is a schematic structural view of the iron-type transport trolley of fig. 4.

In the figure:

1. a sand core cavity; 2. perforating; 3. an outer shape die; 4. iron type; 5. a mold base plate; 6. a core head seat of the sand core of the shape mold; 7. a casting male die; 8. a core head cavity of the sand core of the appearance mold; 9. a sand core cavity of the external mold; 10. an outer form locating pin hole; 11. a metallographic test block male die; 12. a male die of a mechanical test block; 13. a male die of the gating system; 14. a casting cavity; 15. a core sand core cavity; 16. an iron sand core cavity; 17. an iron-type positioning pin hole; 18. a metallographic test block cavity; 19. a mechanical test block cavity; 20. a casting system cavity; 21. a hanging shaft; 22. an iron-type supporting seat; 23. a vehicle body; 24. a sand core ejector rod; 25. a trolley positioning pin; 26. a supporting iron block; 27. a wheel; 28. a precoated sand cavity; 29. and (4) molding the sand core head seat cavity.

Detailed Description

The invention will be further explained with reference to the drawings and specific embodiments, it being noted that the specific embodiments are not intended to limit the scope of the invention as claimed.

As shown in fig. 1 to 5, the sand-lined metal mold with a core making function provided by the invention comprises an outer mold 3, an iron mold 4 and an iron mold transport trolley, wherein the outer mold 3 comprises a mold base plate 5, the mold base plate 5 comprises a casting male mold 7, an outer mold sand core holder 6, an outer film sand core cavity 9, a metallographic test block male mold 11, a mechanical test block male mold 12 and a casting system male mold 13, and specifically, the casting male mold 7, the outer mold sand core holder 6, the metallographic test block male mold 11, the mechanical test block male mold 12 and the casting system male mold 13 are respectively connected to the mold base plate 5 through bolts. Preferably, the parting surface of the outline mold core cavity 9 is selected to be consistent with the parting surface of the outer mold 3 (as shown in the figure) according to the structure of the sand core, and a curved parting mode which is inconsistent with the parting surface of the outer mold 3 can also be selected. The two sides of the plurality of casting male dies 7 are respectively connected with the outline mold sand core head seats 6, a plurality of outline film sand core cavities 9 are arranged in the vacant areas beside the casting male dies 7, and outline film sand core head cavities 8 are respectively arranged at the two ends of the plurality of outline film sand core cavities 9. The metallographic test block male die 11, the mechanical test block male die 12 and the pouring system male die 13 are respectively connected with the casting male die 7, and two ends of the parting surface of the die base plate 5 are respectively provided with an external die positioning pin hole 10.

The upper iron mold 4 comprises a casting cavity 14 corresponding to the casting male mold 7, an iron-type sand core head seat cavity 29 corresponding to the outline mold sand core head seat 6, an iron-type sand core cavity 15 corresponding to the outline mold sand core cavity 9, a metallographic test block cavity 18 corresponding to the metallographic test block male mold 11, a mechanical test block cavity 19 corresponding to the mechanical test block male mold 12 and a casting system cavity 20 corresponding to the casting system male mold 13, and the metallographic test block cavity 18, the mechanical test block cavity 19 and the casting system cavity 20 are respectively connected with the casting cavity 14.

And iron core head cavities 16 corresponding to the outline film core head cavities 8 are respectively arranged at two ends of the iron core sand cavities 15, and a plurality of perforations 2 are respectively arranged on the casting cavity 18 and the iron core sand cavities 15. Iron mold supporting seats 22 are respectively arranged on two sides of the iron mold 4, so that the iron mold 4 can be supported on a motorized roller way. And two ends of the iron mold 4 are respectively provided with a hanging shaft 21.

When the sand shooting molding is carried out, the iron mold 4 is supported on a motorized roller way through an iron mold supporting seat 22, conveyed to the upper part of the outer mold 4 through the motorized roller way and butted with the outer mold 4, and fixed through a positioning pin penetrating through an outer mold positioning pin hole 10 and an iron mold positioning pin hole 17, so that a precoated sand cavity is formed between the casting male mold 7 and the casting cavity 14, and a sand core cavity 1 is formed between the outer mold sand core cavity 9 and the iron mold sand core cavity 15. As shown in fig. 1, the precoated sand enters the precoated sand chamber 28 and the sand core cavity 1 from the perforations 2 on the casting cavity 14 and the perforations 2 on the iron core cavity 15, respectively, after the precoated sand is heated and solidified by the iron mold, the outer mold 4 is lowered to separate the precoated sand from the iron mold 3, the precoated sand in the precoated sand chamber 28 adheres to the iron mold 4, and the precoated sand in the sand core cavity 1 is solidified to form a sand core which is left in the iron mold 3.

After stripping, the iron mold 3 is turned over by a box turnover machine until the back face is downward, and is descended and placed on an iron mold transport trolley.

The iron-type transport trolley comprises a trolley body 23, wheels 27, sand core ejector rods 24 and iron-type supporting blocks 26, wherein the wheels 27 are respectively installed at the bottom of the trolley body 23, the iron-type supporting blocks 26 are respectively and uniformly arranged on two sides of the top of the trolley body 23, and the iron-type supporting blocks 26 are used for stably supporting the iron mold 3 on the trolley body 23; and secondly, an exhaust space is provided for the iron mold 3. A plurality of sand core ejector rods 24 respectively correspond to the positions of the perforation 2 of the iron core cavity 15 and are arranged on the top of a vehicle body 23, iron core positioning pin holes 17 are respectively arranged at two ends of the iron core 3, a trolley positioning pin 25 corresponding to the iron core positioning pin holes 17 is arranged on the top of the vehicle body 23, the iron core 3 movably penetrates through the trolley positioning pin 25 through the iron core positioning pin holes 17 and is fixed on the top of the vehicle body, so that the sand core ejector rods 24 are opposite to the perforation 2 corresponding to the iron core cavity 15, and in the descending process of the iron core 3, the sand core ejector rods 24 respectively penetrate through the perforation 2 on the iron core cavity 15 correspondingly by utilizing the gravity of the iron core to eject the manufactured sand core from the iron core 3.

And finally, manually removing the precoated sand solidified by the perforation 2 on the residual iron core cavity 15 on the sand core, and after the sand core is trimmed, putting the sand core on the position of the outline mold sand core headstock 6 to finish core loading. The sand-lined metal mold can simultaneously obtain the precoated sand outline mold cavity and the sand core integrated with the metal mold only by using the outline mold 4 and the metal mold 3, and a core box does not need to be manufactured in the whole sand-lined metal mold casting process, so that the investment of core box equipment is reduced, the manufacturing cost of core box manufacturing operators is saved, and the production efficiency is greatly improved.

The iron mold sand-lined casting process using the iron mold sand-lined mold with the core making function comprises the following steps of:

(1) when shooting sand and molding, conveying the iron mold 3 to the upper part of the external mold 4, and butting the iron mold 3 and the external mold 4 to form a precoated sand cavity 28 and a sand core cavity 1;

(2) the precoated sand is injected into the precoated sand cavity 28 and the sand core cavity 1 in the step (1) through the perforation 2, after being heated and cured, the outer form 4 is descended to be separated from the iron form 3, the cured precoated sand is adhered to the iron form 3, the sand core follows the iron form 3 and stays on the iron core cavity 15, and after stripping, the precoated sand outer form cavity and the sand core integrated with the iron form 3 are simultaneously prepared;

(3) turning over the iron mold 3 with the back facing downwards and the cavity facing upwards by a box turnover machine, transferring the iron mold 3 to an iron mold transport trolley by a box transfer machine, movably penetrating the iron mold 3 through a trolley positioning pin 25 on the iron mold transport trolley through a positioning pin hole for positioning, movably penetrating a sand core ejector rod 24 on the iron mold transport trolley through a perforation 2 on an iron core cavity 15 respectively, and ejecting the manufactured sand core out of the iron mold 3;

(4) and (4) finishing the sand core, and putting the sand core on the sand core head seat 6 of the appearance mold to finish core loading.

The technology of the invention is adopted to produce products of SN1000 crankshafts (hollow structure), EA188 flywheels and 440 split type differential shells. The following are examples of some of the products therein:

example 1: SN1000 crankshaft

The weight of the parts is 40Kg, the parts are two in one box, and each part needs to be provided with 4 oil duct sand cores at the position of a connecting rod neck. The sand core is taken out 4 in the upper outer die and the upper iron mold, and is taken out 4 in the lower outer die and the lower iron mold. The iron mold is directly manufactured by the external mold and the iron mold without using a core box. And (4) ejecting the sand core on the transport trolley, manually removing the residual iron core mould cavity perforations, and gluing and bonding the plaster at the position of the core head to finish the core installation of the outline mould. Saves one core shooting operator and the investment of a core box, and has good effect.

Example 2: production of EA188 flywheel

The weight of the parts is 90Kg, and the parts are one in one box. The center hole of the flywheel is large in the middle and small at two ends, so that the flywheel cannot be lifted out by adopting a core lifting scheme and only can be provided with a sand core. In order to avoid the investment of a core box, the combination of an external mold and an iron mold is also adopted, and the sand core is obtained while the external mold is produced.

The casting method of the invention also produces parts such as differential shells of trucks, hollow oil duct crankshafts, six-cylinder machine crankshafts and the like, realizes a coreless box scheme, reduces the cost of tooling dies, reduces labor and obtains remarkable benefits in many aspects.

Claims (5)

1. The sand-lined metal mold with the core making function is characterized by comprising an external mold and an iron mold, wherein the external mold comprises a mold base plate, the mold base plate comprises a casting male mold, an external mold sand core head seat and an external mold sand core cavity, two sides of the plurality of casting male molds are respectively connected with the external mold sand core head seat, and two ends of the plurality of external mold sand core cavities are respectively provided with the external mold sand core head cavities; the iron mold comprises a casting cavity corresponding to the casting male mold, an iron mold core headstock cavity corresponding to the outline mold core headstock, and iron mold core cavities corresponding to the outline mold core cavity, wherein the iron mold core headstock cavities are arranged at two ends of the plurality of iron mold core cavities respectively, the iron mold core cavities corresponding to the outline mold core cavities are arranged at two ends of the plurality of iron mold core cavities respectively, the casting cavity and the iron mold core cavities are respectively provided with a perforation, the outline mold and the iron mold are butted to form a film-coated sand cavity between the casting male mold and the casting cavity, and the sand core cavity is formed between the outline mold core cavity and the iron mold core cavities.

2. The sand lined metal mold with a core making function according to claim 1, further comprising a metal mold transporting trolley, wherein the metal mold transporting trolley comprises a trolley body, wheels, sand core ejector rods and metal mold supporting blocks, the wheels are respectively installed at the bottom of the trolley body, the metal mold supporting blocks are respectively and uniformly arranged at two sides of the top of the trolley body, the sand core ejector rods respectively correspond to the perforation positions of the metal mold core cavities and are installed at the top of the trolley body, the metal mold is respectively provided with metal mold positioning pin holes, trolley positioning pins corresponding to the metal mold positioning pin holes are arranged at the top of the trolley body, the metal mold movably penetrates through the trolley positioning pins through the metal mold positioning pin holes and is fixed at the top of the trolley body, and the sand core ejector rods respectively penetrate through the corresponding metal mold core cavities to perforate so as to eject the made sand cores out of the metal mold.

3. The sand lined metal mold with a core making function according to claim 1, wherein the mold base plate further comprises a metallographic test block male mold, a mechanical test block male mold and a gating system male mold, the metallographic test block male mold, the mechanical test block male mold and the gating system male mold are respectively connected with the casting male mold, and the mold base plate is respectively provided with an external mold positioning pin hole.

4. The sand lined metal mold with a core making function as claimed in claim 3, wherein the metal mold further comprises a metallographic specimen cavity corresponding to the metallographic specimen punch, a mechanical specimen cavity corresponding to the mechanical specimen punch and a gating system cavity corresponding to the gating system punch, the metallographic specimen cavity, the mechanical specimen cavity and the gating system cavity are respectively connected to the casting cavity, iron mold supporting seats are respectively arranged on two sides of the metal mold, and hanging shafts are respectively arranged at two ends of the iron mold.

5. The sand-lined metal mold casting process using the sand-lined metal mold with a core making function according to any one of claims 1 to 4, characterized by comprising the steps of:

(1) when shooting sand and molding, butting an iron mold and an external mold to form a film-coated sand cavity and a sand core cavity;

(2) respectively injecting precoated sand into the precoated sand chamber and the sand core cavity in the step (1) through perforation, lowering an outer form die after heating and curing, separating the outer form die from an iron mold, adhering the cured precoated sand to the iron mold, leaving a sand core on the iron mold sand core cavity along with the iron mold, and simultaneously preparing the precoated sand outer form die cavity and the sand core integrated with the iron mold after stripping;

(3) turning over the iron mold with the molded back facing downwards, transferring the iron mold to an iron mold transport trolley, wherein sand core ejector rods on the iron mold transport trolley respectively movably penetrate through the perforations on the iron mold sand core cavity, and ejecting the manufactured sand core out of the iron mold;

(4) and (4) finishing the sand core, and putting the sand core on a sand core head seat of the appearance mold to finish core loading.

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