CN112517843A - High-positioning-precision steel-casting precoated sand mold - Google Patents

Abstract

The invention discloses a precoated sand mold with high positioning accuracy for cast steel, and relates to the technical field of precoated sand molds. The upper die and the lower die are positioned by arranging the guide pins and the guide holes, so that the movement amount between the upper die and the lower die is reduced, the matching speed is improved, the two upper positioning pins and the lower positioning columns on the lower die penetrate through the two positioning grooves on the upper die, the upper die and the lower die are accurately positioned, the limiting balls slide into the clamping grooves, the movement amount between the upper die and the lower die is reduced, the matching precision of the upper die and the lower die in die assembly is further improved, and the production quality of products is improved.

Description

High-positioning-precision steel-casting precoated sand mold

Technical Field

The invention relates to the technical field of precoated sand molds, in particular to a high-positioning-precision precoated sand mold for cast steel.

Background

And (3) coating sand, wherein the surface of sand grains is coated with a layer of molding sand or core sand of a solid resin film before molding. There are two film-coating processes of cold method and hot method: dissolving the resin with ethanol by a cold method, adding urotropine in the sand mixing process to coat the urotropine and the sand on the surface of sand grains, and volatilizing the ethanol to obtain precoated sand; the heat method is to preheat the sand to a certain temperature, add resin to melt the sand, stir the sand to coat the resin on the surface of the sand, add urotropine water solution and lubricant, cool, crush and screen the sand to obtain the precoated sand. The method is used for steel castings and iron castings.

When the mold is used for producing the steel castings and the iron castings, the upper mold and the lower mold are generally adopted to mold the products in the process of casting the products, the positioning accuracy of the upper mold and the lower mold in the mold closing process is not high in the using process of the existing mold, the displacement deviation is easily generated, the products are deformed or even damaged, and the using requirements cannot be met.

Disclosure of Invention

An object of this application provides a high cast steel is with tectorial membrane sand mould, two on the bed die are gone up the locating pin and are passed two constant head tanks on the mould with reference column down in, realize mould and bed die accurate positioning to spacing ball slides in the draw-in groove, reduces to play the momentum between last mould and the bed die, cooperation precision when further having improved mould and bed die compound die has increaseed product production quality.

In order to achieve the above purpose, the present application provides the following technical solutions: a high-positioning-precision coated sand mold for cast steel comprises an upper mold, a lower mold, an upper mold cavity and a lower mold cavity, wherein the upper mold cavity and the lower mold cavity are respectively arranged on the upper mold and the lower mold, the bottom of the upper mold is provided with a pair of positioning grooves, the side walls of the pair of positioning grooves are respectively provided with a clamping groove, the top of the lower mold is fixedly connected with a pair of lower positioning pins, the tops of the pair of lower positioning pins are respectively provided with a sliding groove, the pair of sliding grooves are respectively provided with an upper positioning pin, the side walls of the pair of lower positioning pins are respectively provided with a placing groove, the pair of placing grooves are respectively provided with a limiting ball, the lower positioning pin and the upper positioning pin are respectively positioned in the positioning grooves, the limiting balls are positioned in the clamping grooves, the bottom of the upper mold is provided with a pair of guide holes, the top of the lower mold is, the top of going up the mould is provided with compresses tightly the portion for go up the mould and the bed die cooperation compresses tightly, be provided with guide portion in the bed die, the bottom of bed die is provided with places the portion.

By means of the structure, when the upper die and the lower die are closed, firstly, the two guide pins on the lower die are respectively aligned with the two guide holes on the upper die, the guide pins penetrate through the guide holes, positioning is realized by the upper die and the lower die under the matching of the guide pins and the guide holes, the moving amount between the upper die and the lower die is reduced, the matching speed is improved, the two upper positioning pins and the lower positioning columns on the lower die penetrate through the two positioning grooves on the upper die, accurate positioning of the upper die and the lower die is realized, the limiting balls slide into the clamping grooves, the moving amount between the upper die and the lower die is reduced, the matching precision when the upper die and the lower die are closed is further improved, and the product production quality is improved.

Preferably, the compressing part comprises a side plate arranged on one side of the upper die, the top of the side plate is fixedly connected with a pair of L-shaped plates, the same side of the pair of L-shaped plates is fixedly connected with a slide rail, the top of the pair of slide rails is provided with a moving groove, a compression bar is slidably connected in the pair of moving grooves, one end of each of the pair of pressure bars is respectively positioned in the pair of limiting pressure grooves, the tops of the pair of L-shaped plates are fixedly connected with threaded sleeves, studs are screwed in the pair of threaded sleeves, the bottom ends of the studs are respectively rotatably connected to the tops of the pair of pressure bars, belt wheels are fixedly sleeved at the top ends of the studs, belts are tensioned on the belt wheels, the top of one of the belt wheels is fixedly connected with a handle, and a connecting rod is fixedly connected between the pair of pressure rods.

Further, the handle rotates, the handle drives one of them band pulley and rotates, through the belt, make another band pulley rotate simultaneously, two band pulleys rotate, it rotates to drive two double-screw bolts respectively, two double-screw bolts rotate and remove along two threaded sleeve respectively, thereby drive two depression bars and remove along the shifting chute on two slide rails, the one end of two depression bars removes respectively to two spacing indent on the top of the upper die, and realize compressing tightly the last mould, when preventing that mould cooperation back casting from dissolving, the mould receives great pressure, make the mould part, lead to the product flaw to appear, scrap even.

Preferably, the placing part comprises a pair of bases arranged at the bottom of the lower die, bottom plates are fixedly connected to the bottoms of the bases, the top of each base is box-shaped and used for placing the lower die, and clamping parts are arranged on two sides of each base.

Through setting up a pair of base, the top position department of base is box-like, and the bed die of being convenient for steadily places.

Preferably, the side plate is fixedly connected to one side of the pair of bases, a reinforcing plate is fixedly connected to one side of the pair of bases, and one end of the reinforcing plate is fixedly connected to the side plate.

Through setting up the reinforcing plate, carry out additional strengthening to curb plate and base fixed position department, prevent long-time the use, make the curb plate take place to warp, and influence normal use.

Preferably, the clamping portion comprises a pair of limiting rods which penetrate through the base respectively, a pair of limiting rods are fixedly connected to one ends, close to each other, of the limiting rods, pull rings are fixedly connected to the other ends of the limiting rods, limiting grooves are formed in two sides of the lower die, the limiting blocks are located in the limiting grooves respectively, compression springs are sleeved on the limiting rods, and two ends of each compression spring are fixedly connected with the base and the pull rings respectively.

Furthermore, through setting up pressure spring, gag lever post, spacing groove, stopper, the back is steadily placed on the base to the bed die, and the stopper card is gone into the spacing inslot on the bed die to under pressure spring's spring action, press from both sides tightly the bed die, and make its position remain stable fixed, thereby be convenient for the compound die operation on next step, through setting up the pull ring, be convenient for through the pulling pull ring, make gag lever post, stopper, relieve spacingly to the bed die.

Preferably, the material guiding portion comprises a pair of top holes formed in the bottom of the lower die, a pair of top blocks are arranged in the top holes, a pair of top rods are fixedly connected to the bottoms of the top blocks, one ends of the pair of top rods penetrate through the pair of top holes respectively, a fixing plate is fixedly connected to the pair of top rods, return springs are sleeved on the pair of top rods, and two ends of each return spring are fixedly connected with the fixing plate and the lower die respectively.

Further, after the product is cast and molded, the fixing plate drives the pair of ejector rods and the ejector block to move along the ejector hole by pushing the fixing plate, so that the product in the lower die is pushed, the product can be conveniently taken out of the lower die, and the operation is convenient.

Preferably, the diameter of the guide hole is larger than that of the positioning groove, the diameter of the upper section of the positioning groove is matched with that of the upper positioning pin, the diameter of the lower section of the positioning groove is matched with that of the lower positioning pin, a positioning spring is arranged in the sliding groove, two ends of the positioning spring are respectively fixedly connected with the upper positioning pin and the lower positioning pin, a limiting spring is arranged in the placing groove, and two ends of the limiting spring are respectively fixedly connected with the limiting ball.

The upper segment and the hypomere diameter of constant head tank are different, and lower locating pin, last locating pin cooperate with hypomere and upper segment respectively, and the benefit that sets up like this is, the location installation of being convenient for to and improve the cooperation precision, through setting up positioning spring, spout, compound die, when going up locating pin contact constant head tank hypomere inner wall, can slide in the spout, thereby the compound die of being convenient for has improved cooperation speed.

Preferably, a pair of exhaust holes is formed in the top of the upper die, a pair of dustproof caps is fixedly connected to the top of the upper die, the pair of dustproof caps are respectively located right above the pair of exhaust holes, and the dustproof caps are of umbrella-shaped structures.

Through setting up the exhaust hole, when being convenient for cast, the air escape in the die cavity through setting up dustproof cap, prevents that dust or other impurity from getting into in the exhaust hole, causes the exhaust hole to block up, and influences normal casting, and dustproof cap is umbelliform structure, is convenient for pile up the dust clearance on dustproof cap.

Preferably, both sides of the upper die and the lower die are fixedly connected with buckles, both sides of the lower die are fixedly connected with first rings, and the top of the upper die is fixedly connected with second rings.

Through setting up first rings, second rings, attacker, the bed die and bed die of being convenient for carry out machinery or artifical transport, convenient operation.

Preferably, the bottom of the upper die is provided with a secondary groove, the top of the lower die is fixedly connected with a secondary convex ring block, the secondary convex ring block is matched with the secondary groove, and a plurality of reinforcing ribs are fixedly connected to the two sides of the upper die and the two sides of the lower die.

The secondary groove has been seted up through the bottom of last mould, and the top fixedly connected with second grade bulge loop piece of bed die, second grade bulge loop piece and second grade groove looks adaptation improve mould and bed die closing time leakproofness, avoid having the gap, during the casting, dissolve the material and flow from the gap, cause to dissolve the material extravagant, through setting up a plurality of strengthening ribs, improve the rigidity, the intensity of going up mould and bed die, reduce and go up mould and bed die and receive high temperature fracture risk.

The upper die and the lower die are reasonable in structure, when the upper die and the lower die are closed, the two guide pins on the lower die are respectively aligned with the two guide holes on the upper die, the guide pins penetrate through the guide holes, the upper die and the lower die are positioned under the matching of the guide pins and the guide holes, the moving amount between the upper die and the lower die is reduced, the matching speed is improved, the two upper positioning pins and the lower positioning columns on the lower die penetrate through the two positioning grooves on the upper die, the upper die and the lower die are accurately positioned, the limiting balls slide into the clamping grooves, the moving amount between the upper die and the lower die is reduced, the matching precision of the upper die and the lower die is further improved when the upper die and the lower die are closed, and the production quality of products is improved;

according to the invention, the handle is rotated to drive one belt wheel to rotate, the other belt wheel is simultaneously rotated through the belt, the two belt wheels rotate to respectively drive the two studs to rotate, the two studs respectively rotate and move along the two threaded sleeves to drive the two pressure rods to move along the moving grooves on the two sliding rails, one ends of the two pressure rods respectively move into the two limiting pressure grooves on the top of the upper die, the upper die is pressed tightly, and the die is prevented from being separated due to higher pressure when a molten material is cast after the die is matched, so that a product is flawed or even scrapped;

according to the invention, by arranging the compression spring, the limiting rod, the limiting groove and the limiting block, after the lower die is stably placed on the base, the limiting block is clamped into the limiting groove on the lower die, and the lower die is clamped under the elastic action of the compression spring and the position of the lower die is stably fixed, so that the next step of die assembly operation is facilitated;

according to the invention, the exhaust holes are arranged, so that air in the mold cavity is exhausted during casting, the dust cap is arranged, dust or other impurities are prevented from entering the exhaust holes to cause blockage of the exhaust holes, and normal casting is influenced, the dust cap is of an umbrella-shaped structure, so that dust accumulated on the dust cap can be conveniently cleaned, and the upper mold and the lower mold can be conveniently mechanically or manually carried by arranging the first lifting ring, the second lifting ring and the handle, so that the operation is convenient;

according to the invention, the secondary groove is formed in the bottom of the upper die, the secondary convex ring block is fixedly connected to the top of the lower die, and the secondary convex ring block is matched with the secondary groove, so that the sealing performance of the upper die and the lower die during die assembly is improved, a gap is avoided, a dissolved material flows out from the gap during casting, the dissolved material is wasted, the rigidity and the strength of the upper die and the lower die are improved by arranging the plurality of reinforcing ribs, and the risk of high-temperature cracking of the upper die and the lower die is reduced.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a first perspective three-dimensional structure schematic diagram of a precoated sand mold for cast steel with high positioning accuracy;

FIG. 2 is a second view schematic diagram of the precoated sand mold for cast steel with high positioning accuracy;

FIG. 3 is a schematic view of a partially cut-away three-dimensional structure of a precoated sand mold for cast steel with high positioning accuracy;

FIG. 4 is a schematic view of an enlarged three-dimensional structure of the upper mold and the first viewing angle;

FIG. 5 is a schematic view of an enlarged three-dimensional structure of the upper mold and a second viewing angle;

FIG. 6 is a schematic view of a lower mold and an enlarged three-dimensional structure cooperating with a first view angle;

FIG. 7 is a schematic view of a lower mold and an enlarged three-dimensional structure cooperating with a second view angle;

fig. 8 is an enlarged schematic view of a portion a in fig. 6.

In the figure: 1. an upper die; 2. a lower die; 3. a limiting rod; 4. reinforcing ribs; 5. buckling a handle; 6. a base; 7. a base plate; 8. a limiting block; 9. a pull ring; 10. a compression spring; 11. a slide rail; 12. a pressure lever; 13. a side plate; 14. an L-shaped plate; 15. a reinforcing plate; 16. a first hanging ring; 17. a pulley; 18. a threaded bushing; 19. a handle; 20. a stud; 21. a belt; 22. a second hoisting ring; 23. a connecting rod; 24. a dust cap; 25. a lower locating pin; 26. a guide pin; 27. a fixing plate; 28. an upper mold cavity; 29. a secondary tank; 30. a guide hole; 31. positioning a groove; 32. a card slot; 33. an exhaust hole; 34. limiting and pressing the groove; 35. a lower die cavity; 36. a top block; 37. a secondary convex ring block; 38. a limiting groove; 39. a return spring; 40. an upper positioning pin; 41. a limiting ball; 42. a limiting spring; 43. and positioning the spring.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example (b): referring to fig. 1-8, a high-positioning-accuracy coated sand mold for cast steel includes an upper mold 1, a lower mold 2, an upper mold cavity 28 and a lower mold cavity 35 respectively disposed on the upper mold 1 and the lower mold 2, a pair of positioning grooves 31 disposed at the bottom of the upper mold 1, a pair of clamping grooves 32 disposed on the sidewalls of the positioning grooves 31, a pair of lower positioning pins 25 fixedly connected to the top of the lower mold 2, a pair of sliding grooves disposed at the tops of the lower positioning pins 25, an upper positioning pin 40 disposed in the pair of sliding grooves, and the lower positioning pins 25 and the lower mold 2 may be connected in any manner in the prior art, such as welding.

The side walls of the pair of lower positioning pins 25 are provided with placing grooves, the pair of placing grooves are provided with limiting balls 41, and the limiting balls 41 can be any ball body in the prior art, such as steel balls.

Lower locating pin 25, go up locating pin 40 and be located the constant head tank 31 respectively, spacing ball 41 is located draw-in groove 32, a pair of guiding hole 30 has been seted up to the bottom of going up mould 1, a pair of guiding pin 26 of the top fixedly connected with of bed die 2, a pair of guiding hole 30 is run through respectively to the one end of a pair of guiding pin 26, the top of going up mould 1 is provided with the portion of compressing tightly for it compresses tightly with the cooperation of bed die 2 to go up mould 1, be provided with guide portion in the bed die 2, the bottom of bed die 2 is provided with places the portion.

By means of the structure, when the upper die 1 and the lower die 2 are closed, firstly, the two guide pins 26 on the lower die 2 are respectively aligned with the two guide holes 30 on the upper die 1, and the guide pins 26 penetrate through the guide holes 30, at the moment, under the matching of the guide pins 26 and the guide holes 30, the upper die 1 and the lower die 2 realize positioning, the moving amount between the upper die 1 and the lower die 2 is reduced, the matching speed is improved, the two upper positioning pins 40 and the lower positioning columns 25 on the lower die 2 penetrate through the two positioning grooves 31 on the upper die 1, the upper die 1 and the lower die 2 are accurately positioned, the limiting balls 41 slide into the clamping grooves 32, the moving amount between the upper die 1 and the lower die 2 is reduced, the matching precision when the upper die 1 and the lower die 2 are closed is further improved, and the product production quality is improved.

As an implementation manner in this embodiment, the pressing portion includes a side plate 13 disposed on one side of the upper mold 1, a pair of L-shaped plates 14 is fixedly connected to the top of the side plate 13, slide rails 11 are fixedly connected to the same sides of the pair of L-shaped plates 14, moving grooves are formed in the tops of the pair of slide rails 11, pressing rods 12 are slidably connected to the pair of moving grooves, a pair of limiting pressure grooves 34 are formed in the top of the upper mold 1, one ends of the pair of pressing rods 12 are respectively located in the pair of limiting pressure grooves 34, threaded sleeves 18 are fixedly connected to the tops of the pair of L-shaped plates 14, studs 20 are respectively screwed in the pair of threaded sleeves 18, the bottom ends of the pair of studs 20 are respectively rotatably connected to the tops of the pair of pressing rods 12, belt pulleys 17 are respectively fixedly sleeved on the tops of the pair of studs 20, belts 21 are tensioned on the pair of belt pulleys 17, a handle, rotate handle 19, handle 19 drives one of them band pulley 17 and rotates, through belt 21, make another band pulley 17 rotate simultaneously, two band pulleys 17 rotate, drive two double-screw bolts 20 respectively and rotate, two double-screw bolts 20 rotate and remove along two threaded sleeve 18 respectively, thereby drive two depression bars 12 and remove along the shifting chute on two slide rails 11, the one end of two depression bars 12 moves respectively in two spacing indent 34 on the top of upper mould 1, and the realization compresses tightly mould 1, when preventing that mould cooperation back casting melting, the mould receives great pressure, make the mould part, lead to the product flaw to appear, scrap even.

As an implementation manner in this embodiment, the placing portion includes a pair of bases 6 disposed at the bottom of the lower mold 2, bottom fixedly connected to bottom plates 7 of the pair of bases 6, the top positions of the bases 6 are box-shaped for placing the lower mold 2, clamping portions are disposed on both sides of the bases 6, and by disposing the pair of bases 6, the top positions of the bases 6 are box-shaped for facilitating stable placement of the lower mold 2.

As an implementation manner in the embodiment, the side plate 13 is fixedly connected to one side of the pair of bases 6, the reinforcing plate 15 is fixedly connected to one side of each of the pair of bases 6, one end of the pair of reinforcing plates 15 is fixedly connected to the side plate 13, and the fixing position of the side plate 13 and the base 6 is reinforced by the reinforcing plate 15, so that the side plate 13 is prevented from deforming to affect normal use after long-time use.

As an implementation manner in this embodiment, the clamping portion includes a pair of limiting rods 3 respectively penetrating through a pair of bases 6, one ends of the pair of limiting rods 3 close to each other are fixedly connected with limiting blocks 8, the other ends of the pair of limiting rods 3 are fixedly connected with pull rings 9, both sides of the lower mold 2 are respectively provided with limiting grooves 38, the pair of limiting blocks 8 are respectively located in the pair of limiting grooves 38, a pair of compression springs 10 are respectively sleeved on the pair of limiting rods 3, both ends of the pair of compression springs 10 are respectively fixedly connected with the pair of bases 6 and the pair of pull rings 9, by arranging the compression springs 10, the limiting rods 3, the limiting grooves 38 and the limiting blocks 8, after the lower mold 2 is stably placed on the bases 6, the limiting blocks 8 are clamped in the limiting grooves 38 on the lower mold 2, and under the elastic force of the compression springs 10, the lower mold 2 is clamped and the position of the lower mold is stably fixed, thereby, through setting up pull ring 9, be convenient for through pulling pull ring 9, make gag lever post 3, stopper 8, remove spacingly to bed die 2.

As an implementation mode in this embodiment, guide portion is including offering a pair of apical pore on 2 bottoms of bed die, all be provided with kicking block 36 in a pair of apical pore, the equal fixedly connected with ejector pin in the bottom of a pair of kicking block 36, a pair of apical pore is run through respectively to the one end of a pair of ejector pin, and fixedly connected with fixed plate 27, return spring 39 has all been cup jointed on a pair of ejector pin, a pair of return spring 39's both ends respectively with fixed plate 27, bed die 2 fixed connection, after the product casting shaping, through promoting fixed plate 27, fixed plate 27 drives a pair of ejector pin, kicking block 36 moves along the apical pore, thereby promote the product in the bed die 2, thereby be convenient for the product take out in the bed die 2, and convenient for operation.

As an implementation manner in this embodiment, the diameter of the guiding hole 30 is larger than the diameter of the positioning slot 31, the diameter of the upper section of the positioning slot 31 is matched with the diameter of the upper positioning pin 40, the diameter of the lower section of the positioning slot 31 is matched with the diameter of the lower positioning pin 25, the positioning spring 43 is arranged in the sliding slot, two ends of the positioning spring 43 are respectively fixedly connected with the upper positioning pin 40 and the lower positioning pin 25, the limiting spring 42 is arranged in the placing slot, two ends of the limiting spring 42 are respectively fixedly connected with the limiting ball 41, the diameters of the upper section and the lower section of the positioning slot 31 are different, the lower positioning pin 25 and the upper positioning pin 40 are respectively matched with the lower section and the upper section, so, through setting up positioning spring 43, spout, when the compound die, when going up locating pin 40 contact constant head tank 31 hypomere inner wall, can slide in the spout to the compound die of being convenient for has improved cooperation speed.

As an implementation manner in this embodiment, a pair of exhaust holes 33 is formed in the top of the upper mold 1, a pair of dust caps 24 is fixedly connected to the top of the upper mold 1, the pair of dust caps 24 are respectively located right above the pair of exhaust holes 33, the dust caps 24 are of an umbrella-shaped structure, through the arrangement of the exhaust holes 33, when casting is facilitated, air in a mold cavity is exhausted, through the arrangement of the dust caps 24, dust or other impurities are prevented from entering the exhaust holes 33, the exhaust holes 33 are blocked, normal casting is affected, and the dust caps 24 are of an umbrella-shaped structure, so that dust accumulated on the dust caps 24 is conveniently cleaned.

As an implementation manner in this embodiment, both sides of the upper die 1 and the lower die 2 are fixedly connected with the handle 5, both sides of the lower die 2 are fixedly connected with the first hanging ring 16, the top of the upper die 1 is fixedly connected with the second hanging ring 22, and by arranging the first hanging ring 16, the second hanging ring 22 and the handle 5, the upper die 1 and the lower die 2 can be conveniently carried mechanically or manually, so that the operation is convenient.

As an implementation manner in this embodiment, the secondary groove 29 is formed at the bottom of the upper mold 1, the secondary convex ring block 37 is fixedly connected to the top of the lower mold 2, the secondary convex ring block 37 is adapted to the secondary groove 29, the upper mold 1 and the lower mold 2 are both fixedly connected to a plurality of reinforcing ribs 4, the secondary groove 29 is formed at the bottom of the upper mold 1, the secondary convex ring block 37 is fixedly connected to the top of the lower mold 2, the secondary convex ring block 37 is adapted to the secondary groove 29, the sealing performance of the upper mold 1 and the lower mold 2 during mold closing is improved, a gap is avoided, during casting, a dissolved material flows out from the gap, the dissolved material is wasted, and by arranging the plurality of reinforcing ribs 4, the rigidity and the strength of the upper mold 1 and the lower mold 2 are improved, and the risk that the upper mold 1 and the lower mold 2 are cracked at high temperature is reduced.

When the device is used, firstly, the lower die 2 is stably placed on the base 6 through the first hanging ring 16 and the handle 5 on the lower die 2, the limiting block 8 is clamped in the limiting groove 38 through the limiting rod 3, the limiting block 8, the pressing spring 10 and the two limiting grooves 38 on the upper die 2, the lower die 2 is clamped under the action of the elastic force of the pressing spring 10, the position of the lower die is stably fixed, the upper die 1 is aligned with the lower die 2 through the second hanging ring 22 and the handle 5, when the upper die 1 and the lower die 2 are closed, firstly, the two guide pins 26 on the lower die 2 are respectively aligned with the two guide holes 30 on the upper die 1, the guide pins 26 penetrate through the guide holes 30, at the moment, under the matching of the guide pins 26 and the guide holes 30, the upper die 1 and the lower die 2 are positioned, and the moving amount between the upper die 1 and the lower die 2 is reduced, the matching speed is improved, two upper positioning pins 40 and the lower positioning columns 25 on the lower die 2 penetrate through two positioning grooves 31 on the upper die 1, the accurate positioning of the upper die 1 and the lower die 2 is realized, the limiting balls 41 slide into the clamping grooves 32, the movement amount between the upper die 1 and the lower die 2 is reduced, the matching precision is further improved when the upper die 1 and the lower die 2 are closed, and the product production quality is improved.

After the upper die 1 and the lower die 2 are closed, the handle 19 is rotated, the handle 19 drives one of the belt pulleys 17 to rotate, the other belt pulley 17 is simultaneously rotated through the belt 21, the two belt pulleys 17 rotate to respectively drive the two studs 20 to rotate, the two studs 20 respectively rotate and move along the two threaded sleeves 18, so as to drive the two press rods 12 to move along the moving grooves on the two slide rails 11, one ends of the two press rods 12 respectively move into the two limiting press grooves 34 on the top of the upper die 1, and the closing and pressing of the upper die 1 and the lower die 1 are realized, so that when molten materials are cast after the dies are matched, the dies are prevented from being subjected to large pressure, so that the dies are separated, so that the products have flaws or even are scrapped, and finally, the casting is carried out, after the products are cast and formed, the fixing plate 27 is pushed, the fixing plate 27 drives a pair of push rods, and the push block, thereby being convenient for the product to take out from the lower die 2 and being convenient for operation.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.

Claims (10)

1. The utility model provides a cast steel that positioning accuracy is high is with tectorial membrane sand mould, includes upper die (1), bed die (2), set up respectively last die cavity (28) and bed die cavity (35) on upper die (1) and bed die (2), its characterized in that: the bottom of the upper die (1) is provided with a pair of positioning grooves (31), the side walls of the pair of positioning grooves (31) are provided with clamping grooves (32), the top of the lower die (2) is fixedly connected with a pair of lower positioning pins (25), the tops of the pair of lower positioning pins (25) are provided with sliding grooves, the pair of sliding grooves are provided with upper positioning pins (40), the side walls of the pair of lower positioning pins (25) are provided with placing grooves, the pair of placing grooves are provided with limiting balls (41), the lower positioning pins (25) and the upper positioning pins (40) are respectively positioned in the positioning grooves (31), the limiting balls (41) are positioned in the clamping grooves (32), the bottom of the upper die (1) is provided with a pair of guide holes (30), the top of the lower die (2) is fixedly connected with a pair of guide pins (26), one ends of the pair of guide pins (26) respectively penetrate through the pair of guide holes (30), the top of the upper die (1) is provided with a pressing part for the upper die (1) and the lower die (2) to be matched and pressed, a material guiding part is arranged in the lower die (2), and a placing part is arranged at the bottom of the lower die (2).

2. The mold for the mold with high positioning accuracy as set forth in claim 1, wherein: the pressing part comprises a side plate (13) arranged on one side of the upper die (1), the top of the side plate (13) is fixedly connected with a pair of L-shaped plates (14), the same side of the pair of L-shaped plates (14) is fixedly connected with a slide rail (11), the top of the pair of slide rails (11) is provided with a moving groove, the pair of moving grooves are internally and slidably connected with a pressing rod (12), one end of the pair of pressing rods (12) is respectively positioned in the pair of limiting pressing grooves (34), the top of the pair of L-shaped plates (14) is fixedly connected with a threaded sleeve (18), the pair of threaded sleeves (18) are internally and spirally connected with studs (20), the bottom ends of the pair of studs (20) are respectively and rotatably connected to the tops of the pair of pressing rods (12), and the top ends of the pair of studs (20) are fixedly sleeved with belt pulleys (17), a belt (21) is tensioned on the pair of belt wheels (17), the top of one belt wheel (17) is fixedly connected with a handle (19), and a connecting rod (23) is fixedly connected between the pair of compression rods (12).

3. The mold for the mold with high positioning accuracy as set forth in claim 1, wherein: the placing part comprises a pair of bases (6) arranged at the bottom of the lower die (2), the bottoms of the bases (6) are fixedly connected with a bottom plate (7), the top of each base (6) is box-shaped and used for placing the lower die (2), and clamping parts are arranged on two sides of each base (6).

4. The precoated sand mold for cast steel having high positioning accuracy according to any one of claims 2 and 3, wherein: curb plate (13) fixed connection is in a pair of on one side of base (6), and is a pair of equal fixedly connected with reinforcing plate (15) in one side of base (6), and is a pair of the one end fixed connection of reinforcing plate (15) is in on curb plate (13).

5. The mold for the mold with high positioning accuracy as set forth in claim 3, wherein: the clamping part comprises a limiting rod (3) which penetrates through the base (6) in a pair, a limiting block (8) which is fixedly connected with one end of the limiting rod (3) and is close to the other end of the limiting rod (3) in a pair, a pull ring (9) which is fixedly connected with the other end of the limiting rod (3) in a pair, limiting grooves (38) are formed in two sides of the lower die (2) in a pair, the limiting block (8) is located in the limiting grooves (38) in a pair, a compression spring (10) is sleeved on the limiting rod (3) in a pair, and two ends of the compression spring (10) are fixedly connected with the base (6) and the pull ring (9) in a pair.

6. The mold for the mold with high positioning accuracy as set forth in claim 1, wherein: guide portion is including offering in a pair of apical pore on bed die (2) bottom, it is a pair of all be provided with kicking block (36) in the apical pore, it is a pair of the equal fixedly connected with ejector pin in bottom of kicking block (36), the one end of a pair of ejector pin runs through a pair of the apical pore respectively to fixedly connected with fixed plate (27), it is a pair of all cup jointed return spring (39) on the ejector pin, it is a pair of return spring (39) the both ends respectively with fixed plate (27) bed die (2) fixed connection.

7. The mold for the mold with high positioning accuracy as set forth in claim 1, wherein: the diameter of the guide hole (30) is larger than that of the positioning groove (31), the diameter of the upper section of the positioning groove (31) is matched with that of the upper positioning pin (40), the diameter of the lower section of the positioning groove (31) is matched with that of the lower positioning pin (25), a positioning spring (43) is arranged in the sliding groove, two ends of the positioning spring (43) are fixedly connected with the upper positioning pin (40) and the lower positioning pin (25) respectively, a limiting spring (42) is arranged in the placing groove, and two ends of the limiting spring (42) are fixedly connected with the limiting ball (41) respectively.

8. The mold for the mold with high positioning accuracy as set forth in claim 1, wherein: a pair of exhaust holes (33) are formed in the top of the upper die (1), a pair of dustproof caps (24) are fixedly connected to the top of the upper die (1), the dustproof caps (24) are located right above the exhaust holes (33) respectively, and the dustproof caps (24) are of umbrella-shaped structures.

9. The mold for the mold with high positioning accuracy as set forth in claim 1, wherein: the improved mould is characterized in that the upper mould (1) and the lower mould (2) are fixedly connected with buckles (5) on two sides, the lower mould (2) is fixedly connected with first hanging rings (16) on two sides, and the upper mould (1) is fixedly connected with second hanging rings (22) on the top.

10. The mold for the mold with high positioning accuracy as set forth in claim 1, wherein: the bottom of going up mould (1) has seted up secondary groove (29), the top fixedly connected with second grade bulge loop piece (37) of bed die (2), second grade bulge loop piece (37) with secondary groove (29) looks adaptation, go up mould (1) a plurality of strengthening ribs (4) of the equal fixedly connected with in bed die (2) both sides.

Images