Casting precoated sand mold convenient to demold

Abstract

The precoated sand mold comprises an upper mold body, a lower mold body, a casting block and a demolding assembly, an overflow runner is formed in the inner bottom wall of a lower forming groove, the demolding assembly comprises a liquid inlet air bag, a connecting header, a connecting branch pipe and a sliding plate, and sliding grooves are formed in the bottom face of the upper mold body and the top face of the lower mold body correspondingly; the sliding plate is arranged in the sliding groove in a sliding mode, liquid inlets are formed in the inner walls of the upper forming groove and the lower forming groove, alignment holes are formed in the sliding plate, an elastic piece is arranged at the bottom end of the sliding groove, the sliding plate extends out of the sliding groove under the action of the elastic piece in a natural state, and when the end of the sliding plate is flush with the bottom face of the upper die and the top face of the lower die, the alignment holes are formed. The alignment holes communicate with the liquid inlets, the liquid inlet air bag communicates with one end of the connecting header, the multiple connecting branch pipes communicate with the connecting header, and the multiple connecting branch pipes and the multiple liquid inlets are arranged in a one-to-one correspondence mode in the horizontal direction. The casting mold has the effect of improving the casting production and demolding quality.

Description

Technical Field

[0001] The present application relates to the technical field of coated sand core casting, and in particular to a coated sand mold for casting that is easy to demould. Background Art

[0002] The process of coated sand is to mechanically mix powdered thermosetting phenolic resin with raw sand and solidify it when heated. Later, it was developed into a process of using thermoplastic phenolic resin, latent curing agent (urotropine) and lubricant to prepare coated sand through a certain coating process. When the coated sand is heated, the resin coated on the surface of the sand particles melts. Under the action of the methylene decomposed by urotropine, the molten resin quickly changes from a linear structure to a non-melting body structure, thereby solidifying and forming the coated sand. Coated sand molds are widely used in the production of metal castings.

[0003] The coated sand casting process is a hot coated sand stack casting process, including mold making, molding sand preparation, core mold making, core mold forming, mold closing and other steps. The raw material used in the molding sand preparation is coated sand, which has many advantages such as high forming strength, good fluidity, good surface quality, good disintegration, etc. However, in the coated sand mold casting, sand will be left on the mold during core making, which must be cleaned and sprayed with a release agent in time, otherwise it will accumulate more and more, and the sand core will be broken or deformed when the mold is opened. Summary of the invention

[0004] In order to improve the production and demoulding quality of castings, the present application provides a coated sand mold for casting that is easy to demould.

[0005] The present application provides a casting coated sand mold that is easy to demould and adopts the following technical solution: The mould is constructed by a process of stepping up and down to form a mould for molding and is convenient to manufacture and can be applied to a casting of a product according to the present invention. The mould is constructed by a process of stepping up and down to form a mould for molding and is convenient to manufacture and can be applied to a casting of a product according to the present invention. In the sliding groove, a plurality of liquid inlets are provided on the vertical inner walls of the upper forming groove and the lower forming groove, and the liquid inlet is connected to the sliding groove, and a plurality of alignment holes are provided on the sliding plate. An elastic member is provided at the bottom end of the sliding groove, and the elastic member is connected to the sliding plate. In a natural state, the sliding plate extends out of the sliding groove under the action of the elastic member, and when the end of the sliding plate is flush with the bottom surface of the upper mold and the top surface of the lower mold, the alignment hole is connected to the liquid inlet, and the liquid inlet air bag is connected to one end of the connecting manifold, and a plurality of connecting branch pipes are connected on the connecting manifold, and a plurality of the connecting branch pipes are connected to the sliding groove, and a plurality of the connecting branch pipes and a plurality of the liquid inlets are arranged one by one in the horizontal direction, and an extrusion member for extruding the liquid inlet air bag is provided on the upper mold and the lower mold.

[0006] By adopting the above technical scheme, during the process of metal casting, molten metal is injected into the storage tank, and the molten metal passes through the casting flow channel, the transverse flow channel and the overflow flow channel in turn into the lower molding groove and the upper molding groove. The molten metal is cast into the cavity by overflow. It helps to reduce the generation of streaking, and also reduces the possibility of the molten metal falling directly into the cavity from above, causing rapid cooling and block formation, resulting in the generation of cavities. When the upper and lower molds are separated, one end of the sliding plate extends out of the sliding groove under the action of the elastic member. At this time, the alignment hole is connected to the corresponding position of the connecting branch pipe and the liquid inlet hole. The liquid inlet airbag sprays the demoulding agent therein into the upper molding groove and the lower molding groove under the action of the extruder, which facilitates the demoulding of the workpiece. Through the mutual cooperation of the upper mold, the lower mold, the casting block and the demoulding assembly, the stable casting and demoulding of the metal casting are achieved, which has the effect of improving the production and demoulding quality of the casting.

[0007] Optionally, the extrusion member includes an extrusion plate, a liquid storage cylinder, a liquid pushing cylinder, a first liquid inlet tube and a second liquid inlet tube, the upper mold is provided with an installation cavity in the lower mold for accommodating the liquid inlet airbag, the extrusion plate is horizontally connected to the side of the sliding plate close to the liquid inlet airbag, the upper mold and the lower mold are provided with a sliding cavity connected to the sliding groove and the installation cavity, the extrusion plate is slidably arranged in the sliding cavity, one end of the extrusion plate extends into the installation cavity and abuts against the liquid inlet airbag, the two ends of the first liquid inlet tube are respectively connected to the liquid inlet airbag and the liquid pushing cylinder, and the first liquid inlet tube is provided with a first one-way valve, and liquid only flows in through the first one-way valve. The liquid can flow from the liquid pushing cylinder to the liquid inlet air bag in a unidirectional manner through the first liquid inlet tube, the two ends of the second liquid inlet tube are respectively connected to the liquid pushing cylinder and the liquid storage cylinder, and the second liquid inlet tube is provided with a second one-way valve, so that the liquid can only flow from the liquid storage cylinder to the liquid pushing cylinder in a unidirectional manner through the second liquid inlet tube, and a liquid pushing plate is slidably arranged in the liquid pushing cylinder, and the sides of the two liquid pushing plates on the upper mold and the lower mold that are close to each other are connected with a liquid pushing rod in the vertical direction, one end of the liquid pushing rod passes through the liquid pushing cylinder and is slidably connected to the liquid pushing cylinder, and a return spring is arranged on the sides of the two liquid pushing plates that are close to each other, and the other end of the return spring is connected to the inner wall of the liquid pushing cylinder.

[0008] By adopting the above technical scheme, when the upper mold and the lower mold are docked together, the extrusion plate moves with the sliding plate and slides in the sliding inner cavity. The two liquid push rods abut each other as the upper mold and the lower mold are closed, and the liquid push plate slides in the liquid push cylinder, and the demoulding agent in the liquid push cylinder is injected into the liquid inlet air bag through the first liquid inlet pipe and the first one-way valve. When the upper mold and the lower mold are separated from each other, one end of the sliding plate extends out of the sliding groove under the action of the elastic member, and the extrusion plate moves with the sliding plate and squeezes the liquid inlet air bag, so that the demoulding agent therein is sprayed into the upper molding groove and the lower molding groove through the connecting manifold and the connecting branch pipe. At the same time, during the demoulding process, the two liquid push rods slide relative to the liquid push cylinder, and the liquid push plate is reset under the action of the reset spring, and the demoulding agent in the liquid storage cylinder is injected into the liquid push cylinder through the second liquid inlet pipe and the second one-way valve, so as to cope with the next injection of the demoulding agent into the liquid inlet air bag.

[0009] Optionally, a rocking assembly is provided on the bottom surface of the lower mold, and the rocking assembly includes a first bottom plate, a second bottom plate, a mounting ring, a rotating rod and an abutment cam. The first bottom plate is connected to the bottom of the lower mold, and the second bottom plate is arranged below the first bottom plate. A limiting rod is vertically provided on the top surface of the second bottom plate. A limiting through hole is provided on the first bottom plate for the limiting rod to pass through, and the diameter of the limiting rod is smaller than the inner diameter of the limiting through hole. The mounting ring is arranged on the top surface of the second bottom plate, and the rotating rod is rotatably connected to a plurality of rods on the mounting ring along a radial direction. The abutment cam is arranged at one end of the rotating rod, and a driving member for driving the rotating rod to rotate is provided on the second bottom plate, and the rotation angles of the plurality of abutment cams are inconsistent.

[0010] By adopting the above technical solution, when casting molten metal, the driving member drives several rotating rods to rotate, thereby driving the abutment cams connected to the rotating rods to rotate, and the first base plate swings under the action of the abutment cams at different rotation angles, so that the molten metal in the mold cavity can fully fill every corner of the mold cavity, reducing the possibility of hollow cavities in the mold cavity.

[0011] Optionally, a scum filter is provided in the material storage tank, and the scum filter is arranged in an inverted cone shape.

[0012] By adopting the above technical solution, the scum filter screen filters impurities in the molten metal, which helps to improve the production quality of the product. Since the scum filter screen is arranged in an inverted cone shape, the possibility of forming a turbine during the pouring of the molten metal is reduced, thereby reducing the possibility of external air entering the upper molding tank and the lower molding tank under the influence of the molten metal.

[0013] Optionally, a plurality of exhaust holes are vertically opened on the inner top wall of the upper molding groove, and the top ends of the exhaust holes penetrate the upper mold. The top end of the upper mold is connected to a mounting box body connected to the exhaust holes, and a one-way valve plate is provided at the top end of the upper mold. The setting position of the one-way valve plate corresponds to the position of the exhaust holes, and a vacuum device is connected to the mounting box body.

[0014] By adopting the above technical solution, when the metal liquid level in the upper molding groove and the lower molding groove continues to rise during the casting process, the gas in the upper molding groove and the lower molding groove can be discharged through the exhaust channel, and the setting of the one-way valve plate realizes the one-way outward exhaust of the exhaust channel. By setting a vacuum device connected to the installation box body, a negative pressure environment is formed in the vacuum box body, so that bubbles in the metal liquid can overflow and the amount of pores in the finished product can be reduced.

[0015] Optionally, a refractory and breathable block is provided in the liquid inlet.

[0016] By adopting the above technical solution, the refractory and breathable block is arranged in the liquid inlet, which prevents the molten metal from entering the liquid inlet while ensuring the air and water permeability of the liquid inlet. In subsequent processing, there is no need to cut off the excess part formed by the liquid inlet.

[0017] Optionally, a feeding channel connected to the upper molding groove is provided on the inner top wall, a feeding inner cavity is provided at the top of the feeding channel, an inclined connecting channel is provided at the top of the feeding inner cavity and connected to the exhaust channel, and the inclined connecting channel is extended upwardly at an angle away from one end of the feeding channel.

[0018] By adopting the above technical solution, since the volume of the molten metal will shrink during the solidification process, a feeding channel and a feeding inner cavity are provided. During the casting process, the molten metal rises into the feeding inner cavity through the feeding channel, and the air in the feeding inner cavity enters the exhaust channel through the inclined connecting channel and is discharged. During the solidification process of the molten metal, the metal level in the feeding inner cavity drops, and no depression caused by cooling will be generated on the surface of the product.

[0019] Optionally, a liquid level sensor is provided on the upper mold, and one end of the liquid level sensor extends into the shrinkage feeding cavity.

[0020] By adopting the above technical solution, the liquid level sensor detects the liquid level of the molten metal in the feeding cavity, ensuring that the molten metal can rise into the feeding cavity.

[0021] In summary, the present application includes at least one of the following beneficial technical effects: 1. Through the cooperation of the upper mold, lower mold, casting block and demoulding components, stable casting and demoulding of metal castings are achieved, which has the effect of improving the production and demoulding quality of castings; 2. The setting of the swing assembly enables the molten metal in the cavity to fully fill every corner of the cavity, reducing the possibility of hollow space in the cavity; 3. The liquid level sensor detects the liquid metal level in the feeding cavity to ensure that the liquid metal can rise into the feeding cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure of a coated sand mold for casting that is easy to demould, which is used in an embodiment of the present application.

[0023] Figure 2 It is a partial cross-sectional view used to illustrate the demoulding component in the embodiment of the present application.

[0024] Figure 3 yes Figure 2 Enlarged view of part A in the middle.

[0025] Figure 4 yes Figure 2 Enlarged view of part B in the middle.

[0026] Explanation of reference numerals: 1. upper mold; 101. upper molding groove; 102. exhaust channel; 103. shrinkage feeding channel; 104. shrinkage feeding inner cavity; 105. inclined connecting channel; 2. lower mold; 21. lower molding groove; 22. transverse flow channel; 23. overflow flow channel; 3. casting block; 31. storage tank; 32. casting flow channel; 33. scum filter; 4. demoulding assembly; 401. extrusion plate; 402. sliding plate; 403. sliding spring; 404. liquid inlet air bag; 405. connecting manifold; 406. connecting branch pipe; 407. liquid storage cylinder; 408. liquid push cylinder; 409. liquid push plate; 410. abutment block; 411. reset spring; 412. first Liquid inlet pipe; 413, second liquid inlet pipe; 414, liquid push rod; 5, swing assembly; 51, swing motor; 52, first base plate; 53, second base plate; 54, mounting ring; 55, rotating rod; 56, meshing bevel gear; 57, abutting cam; 6, liquid inlet; 7, refractory air-permeable block; 8, sliding groove; 9, alignment hole; 10, mounting inner cavity; 11, sliding inner cavity; 12, first one-way valve; 13, second one-way valve; 14, liquid level sensor; 15, one-way valve plate; 16, mounting box body; 17, sealing cover; 18, first vacuum tube; 19, vacuum pump; 20, second vacuum tube; 24, limit rod; 25, limit through hole; 26, limit block. DETAILED DESCRIPTION

[0027] The following is combined with Figure 1-4 The present application is further described in detail. The present application provides a casting coated sand mold that is easy to demould, which has the effect of improving the production and demoulding quality of castings.

[0028] Reference Figure 1 and Figure 2 A coated sand mold for casting that is easy to demold comprises an upper mold 1, a lower mold 2, a casting block 3, a demolding assembly 4 and a swing assembly 5. The upper mold 1 is arranged above the lower mold 2, and an upper molding groove 101 is provided on the bottom surface of the upper mold 1, and a lower molding groove 21 is provided on the top surface of the lower mold 2, and the upper molding groove 101 and the lower molding groove 21 are arranged correspondingly in the vertical direction. The casting block 3 is connected to the lower mold 2. A storage groove 31 is provided at the top of the casting block 3, and the height of the storage groove 31 is higher than the upper molding groove 101. The bottom end of the storage groove 31 is connected to a casting flow channel 32. A scum filter 33 is provided in the storage groove 31, and the scum filter 33 is arranged in an inverted cone shape. A transverse flow channel 22 is horizontally opened in the lower mold 2, and one end of the transverse flow channel 22 is connected to the bottom end of the casting flow channel 32. A plurality of overflow channels 23 are vertically connected to the transverse channel 22 , and the overflow channels 23 are connected to the lower molding groove 21 .

[0029] Reference Figure 2 and Figure 3 , two groups of demoulding components 4 are provided in the upper mold 1 and the lower mold 2, and the demoulding components 4 include an extrusion plate 401, a sliding plate 402, a sliding spring 403, a liquid inlet air bag 404, a connecting manifold 405, a connecting branch pipe 406, a liquid storage cylinder 407, a liquid pushing cylinder 408, a liquid pushing plate 409, a liquid pushing rod 414, an abutment block 410, a reset spring 411, a first liquid inlet pipe 412 and a second liquid inlet pipe 413. A plurality of liquid inlets 6 are provided at equal intervals along the vertical direction on the vertical inner walls of the upper molding groove 101 and the lower molding groove 21, and a fire-resistant and breathable block 7 is inserted in the liquid inlet 6. A sliding groove 8 is provided on the bottom wall of the upper molding groove 101 and the top wall of the lower molding groove 21 along the vertical direction, and the sliding groove 8 is connected to the liquid inlet 6. The sliding grooves 8 on the upper mold 1 and the lower mold 2 are correspondingly arranged in the vertical direction. The sliding plate 402 is slidably disposed in the sliding groove 8, and the sliding spring 403 is disposed in the sliding groove 8. One end of the sliding spring 403 is connected to the inner bottom wall of the sliding groove 8, and the other end is connected to the sliding plate 402. In a natural state, one end of the sliding plate 402 extends out of the sliding groove 8 under the action of the sliding spring 403, and at this time, the plurality of alignment holes 9 are connected and arranged in a one-to-one correspondence with the plurality of liquid inlets 6. The sliding plate 402 is provided with a plurality of alignment holes 9 along the vertical direction. When the sliding plate 402 moves to be flush with the bottom surface of the upper mold 1 or the top surface of the lower mold 2, the plurality of alignment holes 9 and the plurality of liquid inlets 6 are arranged alternately.

[0030] Reference Figure 2 and Figure 3 , the upper mold 1 and the lower mold 2 are provided with an installation cavity 10, and a sliding cavity 11 is provided between the installation cavity 10 and the sliding groove 8. The liquid inlet airbag 404 is provided in the installation cavity 10, and the extrusion plate 401 is slidably provided in the sliding cavity 11. One end of the extrusion plate 401 is vertically fixedly connected with the sliding plate 402, and the other end of the extrusion plate 401 extends into the installation cavity 10 and abuts against one side of the liquid inlet airbag 404. The extrusion plates 401 in the upper mold 1 and the lower mold 2 abut against the sides of the two liquid inlet airbags 404 that are away from each other. The liquid inlet airbag 404 is connected to one end of the connecting manifold 405, and a plurality of connecting branch pipes 406 are provided on the connecting manifold 405, and the plurality of connecting branch pipes 406 are provided in communication with the sliding groove 8, and the plurality of connecting branch pipes 406 are provided in a one-to-one correspondence with the plurality of liquid inlets 6 in the horizontal direction.

[0031] Reference Figure 2 and Figure 3, the liquid pushing cylinder 408 and the liquid storage cylinder 407 are arranged outside the upper mold 1 and the lower mold 2, the two ends of the first liquid inlet pipe 412 are connected with the liquid inlet air bag 404 and the liquid pushing cylinder 408, and the first liquid inlet pipe 412 is provided with a first one-way valve 12, and the liquid can only flow from the liquid pushing cylinder 408 to the liquid inlet air bag 404 through the first liquid inlet pipe 412. The two ends of the second liquid inlet pipe 413 are connected with the liquid pushing cylinder 408 and the liquid storage cylinder 407, and the second liquid inlet pipe 413 is provided with a second one-way valve 13, and the liquid can only flow from the liquid storage cylinder 407 to the liquid pushing cylinder 408 through the second liquid inlet pipe 413. The liquid pushing plate 409 is horizontally slidably arranged in the liquid pushing cylinder 408, and the liquid pushing rod 414 is vertically fixedly connected to the side of the two liquid pushing plates 409 in the two groups of demolding components 4 in the upper mold 1 and the lower mold 2 that are close to each other. One end of the liquid pushing rod 414 penetrates the liquid pushing cylinder 408 and is slidably connected therewith, and the end of the liquid pushing rod 414 extending out of the liquid pushing cylinder 408 is connected with the abutment block 410, and the two abutment blocks 410 are correspondingly arranged in the vertical direction. A return spring 411 is arranged in the liquid pushing cylinder 408, and one end of the return spring 411 is connected with the inner wall of two liquid pushing cylinders 408 close to each other in the vertical direction, and the other end is connected with the liquid pushing plate 409. Two abutment blocks 410 are correspondingly arranged in the vertical direction, and the top of the liquid pushing rod 414 arranged on the lower mold 2 extends out of the top surface of the lower mold 2 under the effect of the return spring 411, and the top of the liquid pushing rod 414 arranged on the upper mold 1 extends out of the bottom surface of the upper mold 1 under the effect of the return spring 411.

[0032] Reference Figure 2 and Figure 4 A plurality of exhaust holes 102 are vertically opened on the inner top wall of the upper mold 1, and the exhaust holes 102 are connected to the outside. A feeding hole 103 is connected to the inner top wall of the upper mold 1, and the top of the feeding hole 103 is connected to the feeding cavity 104, and the top of the feeding cavity 104 is connected to an inclined communication hole 105, and one end of the inclined communication hole 105 away from the feeding cavity 104 extends obliquely upward and is connected to one of the exhaust holes 102. A liquid level sensor 14 is inserted into the upper mold 1, and one end of the liquid level sensor 14 extends into the feeding cavity 104.

[0033] Reference Figure 2 and Figure 4, a plurality of one-way valve plates 15 are arranged at the top of the upper mold 1, and the plurality of one-way valve plates 15 are arranged one by one corresponding to the tops of the plurality of exhaust ducts 102. A mounting box body 16 is connected to the top surface of the upper mold 1, and the one-way valve plates 15 are arranged in the mounting box body 16. A sealing cover 17 for sealing the material storage tank 31 is rotatably arranged at the top of the casting block 3, and a first vacuum tube 18 connected to the inner cavity of the material storage tank 31 is arranged on the sealing cover 17, and a vacuum pump 19 is arranged at one end of the first vacuum tube 18 away from the sealing cover 17. A second vacuum tube 20 is arranged on the mounting box body 16, and a vacuum pump 19 is arranged at one end of the second vacuum tube 20 away from the mounting box body 16.

[0034] Reference Figure 1 and Figure 2 The swing assembly 5 is arranged below the lower mold 2, and the swing assembly 5 includes a swing motor 51, a first bottom plate 52, a second bottom plate 53, a mounting ring 54, a rotating rod 55, a meshing bevel gear 56 and an abutting cam 57. The first bottom plate 52 is arranged on the bottom surface of the lower mold 2, and the second bottom plate 53 is arranged below the first bottom plate 52. A plurality of limiting rods 24 are vertically fixedly connected to the top surface of the second bottom plate 53, and the top end of the limiting rod 24 is fixedly connected to the limiting block 26. A plurality of limiting through holes 25 are opened on the first bottom plate 52, and the plurality of limiting through holes 25 correspond to the plurality of limiting rods 24 one by one. The limiting rods 24 pass through the first bottom plate 52 through the limiting through holes 25, and the diameter of the limiting rods 24 is smaller than the inner diameter of the limiting holes.

[0035] Reference Figure 2 The mounting ring 54 is fixedly connected to the top surface of the second bottom plate 53. A plurality of rotating rods 55 are rotatably arranged on the mounting ring 54 along the radial direction thereof. One end of the rotating rod 55 located inside the mounting ring 54 is connected to a meshing bevel gear 56. The meshing bevel gears 56 are meshed and connected one by one. One end of the rotating rod 55 located outside the mounting ring 54 is connected to a contact cam 57. The rotation angles of the plurality of contact cams 57 are different. The contact cams 57 contact the bottom surface of the first bottom plate 52. The swing motor 51 is arranged on the top surface of the second bottom plate 53. The output shaft of the swing motor 51 is transmission-connected to one of the rotating rods 55.

[0036] Reference Figure 1-3Before casting, the upper mold 1 moves downward under the action of the driving member and fits with the lower mold 2. During the descent of the upper mold 1, the two abutment blocks 410 arranged on the upper mold 1 and the lower mold 2 contact each other, and the two liquid push rods 414 drive the two liquid push plates 409 connected thereto to slide in the liquid push cylinder 408 in the direction away from each other under the abutment action, and the release agent in the liquid push cylinder 408 is input into the liquid inlet air bag 404 through the first liquid inlet pipe 412 through the first one-way valve 12, and the volume of the liquid inlet air bag 404 increases. The two sliding plates 402 contact each other during the mold closing process and slide in the sliding groove 8. The positions of the several alignment holes 9 on the sliding plate 402 are staggered with the liquid inlet 6 and the connecting branch 406, so as to achieve the blocking of the connecting branch 406, and the sliding spring 403 compresses and accumulates elastic potential energy. The extrusion plate 401 slides in the sliding inner cavity 11 along with the sliding plate 402. After the casting of the workpiece is completed, the top of the upper mold 1 is knocked loose, and the metal in the shrinkage compensation cavity 104 and the exhaust channel 102 is cut off. The upper mold 1 moves upward, and the sliding plate 402 extends out of the sliding groove 8 under the action of the sliding spring 403. At this time, the alignment hole 9 corresponds to the position of the liquid inlet 6 and the connecting branch pipe 406. At the same time, the extrusion plate 401 slides in the sliding cavity 11 toward the direction close to the liquid inlet airbag 404 along with the sliding plate 402. The demoulding agent in the liquid inlet airbag 404 is sprayed into the upper molding groove 101 and the lower molding groove 21 through the connecting manifold 405, the connecting branch pipe 406, the alignment hole 9 and the liquid inlet 6 under the extrusion action of the extrusion plate 401, which helps to improve the demoulding effect of the workpiece surface. The refractory air-permeable block 7 is arranged in the liquid inlet 6, and the liquid inlet 6 is blocked under the premise of ensuring water permeability and air permeability, so as to prevent the metal liquid from entering the liquid inlet 6 during the casting process, and eliminate the need for subsequent cutting operations. During the separation process of the upper mold 1 and the lower mold 2, the two abutment blocks 410 are separated from each other, and the liquid push plate 409 is reset under the action of the reset spring 411. The release agent in the liquid storage cylinder 407 enters the liquid push cylinder 408 through the second liquid inlet pipe 413 and the second one-way valve 13 under the action of the liquid push plate 409 for temporary storage in order to cope with the next round of liquid feeding operation.

[0037] Reference Figure 2 and Figure 4During the pouring process, impurities in the molten metal are filtered and removed by the scum filter 33 in the storage tank 31, which helps to improve the production quality of the workpiece. Since the scum filter 33 is set in an inverted cone shape, the possibility of the molten metal generating vortexes and bringing air into the process of pouring the molten metal is reduced. The molten metal enters the lower molding tank 21 through the casting flow channel 32, the transverse flow channel 22 and the overflow flow channel 23. The liquid level of the molten metal continues to rise in the lower molding tank 21. The molten metal is poured from bottom to top by overflow, which avoids the high-temperature molten metal from falling directly from the top into the upper molding tank 101 and the lower molding tank 21, causing the molten metal temperature to drop sharply and solidify quickly, thereby causing local defects in the workpiece. As the molten metal level rises, the gas in the upper molding tank 101, the lower molding tank 21 and the shrinkage inner cavity 104 is discharged through the inclined connecting channel 105 and the exhaust channel 102. The gas enters the installation box 16 through the one-way valve plate 15 at the top of the exhaust channel 102. The vacuum pump 19 is started, and negative pressure is formed in the storage tank 31 and the installation box body 16 through the first vacuum tube 18 and the second vacuum tube 20, so that the bubbles in the molten metal can be dispersed more quickly, which helps to reduce bubble defects in the finished product.

[0038] Reference Figure 2 While the molten metal is injected into the lower molding groove 21 and the upper molding groove 101, the swing motor 51 is started, driving the rotating rod 55 connected thereto to rotate, and then a plurality of meshing bevel gears 56 that are meshed and linked to each other rotate, driving the abutting cam 57 connected thereto to rotate, and the first bottom plate 52 swings left and right at the abutting cam 57 at different rotation angles, so that the molten metal in the upper molding groove 101 and the lower molding groove 21 can fully infiltrate every corner of the inner cavity under the swinging, thereby reducing the formation of cavities in the internal cavity during the overflow process.

[0039] The implementation principle of a coated sand mold for casting that is easy to demold in the embodiment of the present application is as follows: pouring molten metal into the upper molding groove 101 and the lower molding groove 21 by overflow, shaking the mold while pouring, so that the molten metal can evenly cover every corner of the upper molding groove 101 and the lower molding groove 21. After molding, when the upper mold 1 is away from the lower mold 2, the liquid inlet air bag 404 injects a demolding agent into the upper molding groove 101 and the lower molding groove 21 under the extrusion effect. The injection of the demolding agent allows the sand particles to be more fully separated from the product surface, which helps to improve the production quality and demolding efficiency of the product.

[0040] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A casting coated sand mold that is easy to demould, characterized in that: The invention comprises an upper mold (1), a lower mold (2), a casting block (3) and a demoulding assembly (4); the bottom surface of the upper mold (1) is provided with an upper molding groove (101); the bottom surface of the lower mold (2) is provided with a lower molding groove (21); the casting block (3) is connected to the lower mold (2); the top of the casting block (3) is provided with a material storage groove (31); the bottom end of the material storage groove (31) is provided with a casting flow channel (32); the inner bottom wall of the lower molding groove (21) is provided with an overflow flow channel (23); the bottom end of the overflow flow channel (23) is laterally connected to a transverse flow channel (22); The transverse flow channel (22) is connected to the bottom end of the casting flow channel (32), and the demoulding component (4) is provided in the upper mold (1) and the lower mold (2). The demoulding component (4) includes a liquid inlet air bag (404), a connecting manifold (405), a connecting branch pipe (406) and a sliding plate (402). The bottom surface of the upper mold (1) and the top surface of the lower mold (2) are both provided with sliding grooves (8) in the vertical direction. The sliding grooves (8) on the upper mold (1) and the lower mold (2) are correspondingly arranged in the vertical direction. The sliding plate (402) is slidably arranged. In the sliding groove (8), a plurality of liquid inlets (6) are provided on the vertical inner walls of the upper molding groove (101) and the lower molding groove (21), and the liquid inlets (6) are connected to the sliding groove (8). A plurality of alignment holes (9) are provided on the sliding plate (402). An elastic member is provided at the bottom end of the sliding groove (8), and the elastic member is connected to the sliding plate (402). In a natural state, one end of the sliding plate (402) extends out of the sliding groove (8) under the action of the elastic member, and the end of the sliding plate (402) is aligned with the bottom surface of the upper mold (1) and When the top surface of the lower mold (2) is flush, the alignment hole (9) is connected to the liquid inlet (6), the liquid inlet air bag (404) is connected to one end of the connecting manifold (405), a plurality of connecting branch pipes (406) are connected to the connecting manifold (405), a plurality of connecting branch pipes (406) are connected to the sliding groove (8), a plurality of connecting branch pipes (406) and a plurality of liquid inlets (6) are arranged in a one-to-one correspondence in the horizontal direction, and an extrusion piece for extruding the liquid inlet air bag (404) is provided on the upper mold (1) and the lower mold (2).

2. The easy-to-demold coated sand mold for casting according to claim 1, characterized in that: The extrusion member comprises an extrusion plate (401), a liquid storage cylinder (407), a liquid pushing cylinder (408), a first liquid inlet tube (412) and a second liquid inlet tube (413); the upper mold (1) and the lower mold (2) are both provided with an installation inner cavity (10) for accommodating the liquid inlet airbag (404); the extrusion plate (401) is horizontally connected to a side of the sliding plate (402) close to the liquid inlet airbag (404); the upper mold (1) and the lower mold (2) are both provided with a mounting inner cavity (10) for accommodating the liquid inlet airbag (404); The sliding inner cavity (11) is connected to the groove (8) and the installation inner cavity (10), the extrusion plate (401) is slidably arranged in the sliding inner cavity (11), one end of the extrusion plate (401) extends into the installation inner cavity (10) and abuts against the liquid inlet air bag (404), the two ends of the first liquid inlet pipe (412) are respectively connected to the liquid inlet air bag (404) and the liquid pushing cylinder (408), the first liquid inlet pipe (412) is provided with a first one-way valve (12), the liquid The liquid can only flow from the liquid pushing cylinder (408) to the liquid inlet air bag (404) in one direction through the first liquid inlet pipe (412), and the two ends of the second liquid inlet pipe (413) are respectively connected to the liquid pushing cylinder (408) and the liquid storage cylinder (407). The second liquid inlet pipe (413) is provided with a second one-way valve (13), and the liquid can only flow from the liquid storage cylinder (407) to the liquid pushing cylinder (408) in one direction through the second liquid inlet pipe (413). A liquid pushing plate (409) is slidably arranged in (408), and the sides of the two liquid pushing plates (409) on the upper mold (1) and the lower mold (2) that are close to each other are connected with a liquid pushing rod (414) in the vertical direction, one end of the liquid pushing rod (414) passes through the liquid pushing cylinder (408) and is slidably connected thereto, and a return spring (411) is arranged on the side of the two liquid pushing plates (409) that are close to each other, and the other end of the return spring (411) is connected to the inner wall of the liquid pushing cylinder (408).

3. The easy-to-demold coated sand mold for casting according to claim 1, characterized in that: The bottom surface of the lower mold (2) is provided with a rocking assembly (5), and the rocking assembly (5) comprises a first bottom plate (52), a second bottom plate (53), a mounting ring (54), a rotating rod (55) and an abutting cam (57). The first bottom plate (52) is connected to the bottom of the lower mold (2), the second bottom plate (53) is arranged below the first bottom plate (52), a limiting rod (24) is vertically arranged on the top surface of the second bottom plate (53), and a slot for the limiting rod (24) to pass through is opened on the first bottom plate (52). The limiting through hole (25) is provided, the diameter of the limiting rod (24) is smaller than the inner diameter of the limiting through hole (25), the mounting ring (54) is arranged on the top surface of the second bottom plate (53), the rotating rod (55) is connected to a plurality of roots on the mounting ring (54) for rotation along the radial direction, the abutting cam (57) is arranged at one end of the rotating rod (55), and a driving member for driving the rotating rod (55) to rotate is arranged on the second bottom plate (53), and the rotation angles of the plurality of abutting cams (57) are inconsistent.

4. The easy-to-demold coated sand mold for casting according to claim 1, characterized in that: A scum filter (33) is arranged in the material storage tank (31), and the scum filter (33) is arranged in an inverted cone shape.

5. The easy-to-demold coated sand mold for casting according to claim 1, characterized in that: A plurality of exhaust ducts (102) are vertically opened on the inner top wall of the upper molding groove (101), the top end of the exhaust duct (102) passes through the upper mold (1), the top end of the upper mold (1) is connected to a mounting box body (16) which is connected to the exhaust duct (102), the top end of the upper mold (1) is provided with a one-way valve plate (15), the setting position of the one-way valve plate (15) corresponds to the position of the exhaust duct (102), and the mounting box body (16) is connected to a vacuum device.

6. The easy-to-demold coated sand mold for casting according to claim 1, characterized in that: A fire-resistant air-permeable block (7) is arranged in the liquid inlet (6).

7. The easy-to-demold coated sand mold for casting according to claim 5, characterized in that: A feeding channel (103) communicating with the upper forming groove (101) is provided on the inner top wall thereof, a feeding inner cavity (104) is provided at the top of the feeding inner cavity (104), an inclined communicating channel (105) is provided at the top of the feeding inner cavity (104) and communicated with the exhaust channel (102), and the inclined communicating channel (105) is arranged to extend upwardly and obliquely at one end away from the feeding channel (103).

8. The easy-to-demold coated sand mold for casting according to claim 7, characterized in that: A liquid level sensor (14) is provided on the upper mold (1), and one end of the liquid level sensor (14) extends into the shrinkage feeding cavity (104).

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