Core making process and core making unit

Abstract

The present invention provides a core making process and a core making unit, and relates to the technical field of sand core making. The core making process provided by the present invention comprises: calculating the weight of core sand to be mixed once according to information of the made sand core; mixing raw sand and a binder to prepare mixed core sand; calculating and calibrating the height of the feeding material level in the sand cylinder of the core making unit; and directly adding the mixed core sand into the core making mechanism. The core making process provided by the present invention alleviates the technical problem that the core making process in the related technology is prone to cause poor quality of core sand.

Description

Technical Field

[0001] The invention relates to the technical field of sand core making, in particular to a core making process and a core making unit. Background Art

[0002] Sand core is a transitional product used to manufacture castings in casting production. It is formed into sand core by bonding and solidifying casting sand and auxiliary materials. The process of making sand core in related technology is that the raw sand in the sand storage hopper enters the weighing hopper for weighing. After the raw sand in the weighing hopper meets the requirements, it enters the sand mixing cylinder from the weighing hopper, and then the binder is added to the sand mixing cylinder. The sand mixing cylinder mixes the raw sand and the binder, and the prepared mixed core sand enters the transition sand storage hopper for standby. When the mixed core sand in the core making unit sand cylinder is lower than the set value, the transition sand storage hopper automatically puts a certain amount of material into the core making unit sand cylinder. When the core sand material level of the core making unit sand cylinder reaches the upper limit of the set value, the feeding is stopped.

[0003] A lot of mixed core sand is stored in the transition sand storage hopper at one time, and it needs to be put into the sand barrel of the core making unit many times before it can be used up. As a result, the mixed core sand in the transition sand storage hopper has a long standby time, which will cause partial solidification of the core sand binder (especially in the summer when the room temperature is high), reduce the fluidity of the mixed core sand, and further affect the quality of the core making unit later. First of all, in order to extend the service life of the mixed core sand in the transition sand storage hopper, the transition sand hopper needs to be designed with complex cooling and sealing, which will increase the manufacturing investment of the equipment. In addition, once the mixed core sand in the transition sand storage hopper is stored for too long and affects the quality of core making, it is necessary to clean up and discard all the invalid mixed core sand, and prepare the mixed core sand again, resulting in waste of mixed core sand and waste of labor resources. Summary of the invention

[0004] The first aspect of the present invention aims to provide a core making process to alleviate the technical problem that the core making process in the related art easily causes poor quality of core sand.

[0005] The core making process provided by the present invention comprises:

[0006] According to the information of the sand core, calculate the weight of the core sand to be mixed once;

[0007] Mixing raw sand and a binder to prepare mixed core sand;

[0008] The mixed core sand is directly added to the core making unit.

[0009] Further, the calculation of the weight of the core sand to be mixed once includes:

[0010] Calculate the number of sand core modules that can be made after mixing according to the time of making a sand core and the storage time of the mixed core sand;

[0011] The weight of the mixed core sand is calculated according to the number of sand core modules that can be produced and the weight of the single-mode sand core.

[0012] Furthermore, the mixing of raw sand and binder comprises:

[0013] The sand mixing parameters are set according to the weight of the sand core and the process formula, and the sand mixing parameters include the amount of raw sand added, the amount of binder added, the amount of auxiliary materials added and the sand mixing time.

[0014] Furthermore, the setting of the sand mixing parameters according to the weight of the sand core and the process formula includes: σ=gs / Gs, wherein σ is an adjustable parameter, gs is the weight of the binder, and Gs is the weight of the core sand.

[0015] Furthermore, the setting of the sand mixing parameters according to the weight of the sand core and the process formula includes: GH≤K*Gh, wherein GH is the weight of the mixed core sand; K is a coefficient, and Gh is the weight of the core sand required for each mold.

[0016] Furthermore, the mixing of raw sand and binder includes: mixing one or more binders with raw sand to form mixed core sand.

[0017] Furthermore, the mixing of raw sand and binder comprises: firstly mixing raw sand with a first binder or auxiliary material to form a single component material for standby use, and when mixed core sand is needed for core making, adding a second binder to the single component material.

[0018] The core making process provided by the present invention comprises: calculating the weight of the core sand to be mixed once according to the information of the sand core to be made; mixing the raw sand and the binder to prepare the mixed core sand; and directly adding the mixed core sand into the core making unit. In the process of making the sand core, the core making process provided by the present invention mixes the mixed core sand required for core making once each time, and directly adds the mixed core sand into the core making mechanism, so as to realize "mixing and using immediately", eliminate the waiting time after the raw sand is mixed, and avoid the mixed core sand being exposed for a long time to cause poor fluidity, which affects the quality of core making.

[0019] A second aspect of the present invention provides a core making unit to alleviate the technical problem in the related art that the core making process easily causes poor quality of core sand.

[0020] The core making unit provided by the present invention comprises: a control system, and a weighing mechanism, a sand mixing mechanism and a core making mechanism respectively connected to the control system by signal, wherein the weighing mechanism, the sand mixing mechanism and the core making mechanism are connected in sequence.

[0021] Furthermore, the weighing mechanism comprises a weighing bucket and a weighing sensor, wherein the weighing sensor is arranged on the weighing bucket and is connected to the control system signal;

[0022] The sand mixing mechanism includes a sand mixing cylinder, and a first feeding port and a second feeding port both for adding a binder, wherein the first feeding port and the second feeding port are both arranged on the sand mixing cylinder, or the first feeding port is arranged on the weighing hopper, and the second feeding port is arranged on the sand mixing cylinder.

[0023] In the core making process of the core making unit provided by the present invention, the control system controls the weighing mechanism to weigh the raw materials according to the working conditions of each round of production, the weighed raw materials are added to the sand mixing mechanism, the sand mixing mechanism adds the mixed core sand formed by the mixing to the core making mechanism, and the core making mechanism makes the sand core.

[0024] Compared with the core making unit in the related art that stores mixed core sand, the core making unit provided by the present invention eliminates the transition sand storage hopper. The weighing mechanism weighs the raw sand required for core making once or multiple times each time, and adds the weighed raw sand to the sand mixing mechanism for mixing to form mixed core sand. The mixed core sand is added to the core making mechanism and used up in the shortest time (within the effective use time of the raw sand), thereby avoiding long-term exposure of the mixed core sand to cause poor fluidity and affect the core making quality. In addition, since the transition sand storage hopper is omitted, the detection switch and structure are saved, and the overall height of the core making unit is reduced, thereby reducing the occupied space. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the related technologies, the drawings required for use in the specific embodiments or the related technical descriptions will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 A schematic structural diagram of a core making unit provided in an embodiment of the present invention;

[0027] Figure 2 Schematic diagram of the structure of the sand mixing mechanism of the core making unit provided in an embodiment of the present invention Figure 1 ;

[0028] Figure 3 Schematic diagram of the structure of the sand mixing mechanism of the core making unit provided in an embodiment of the present invention Figure 2 .

[0029] Icons: 110 - PLC controller; 210 - weighing bucket; 220 - weighing sensor; 310 - sand mixing cylinder; 320 - first feeding port; 330 - second feeding port; 340 - sand discharge valve; 350 - sand discharge channel; 360 - sand level sensor; 410 - core making unit sand cylinder; 420 - core making core box; 430 - data reading device; 500 - sand storage hopper. DETAILED DESCRIPTION

[0030] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0032] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] The core making process provided in the embodiment of the present invention includes: calculating the weight of the core sand to be mixed once according to the information of the sand core to be made; mixing the raw sand and the binder to prepare the mixed core sand; calculating and calibrating the feeding level height in the core making unit sand cylinder 410; and directly adding the mixed core sand into the core making mechanism.

[0034] Furthermore, calculating the weight of the core sand required to be mixed once includes: calculating the modulus of the sand core that can be made after mixing according to the time for making a mold of sand core and the storage time of the mixed core sand; calculating the weight of the mixed core sand according to the modulus of the sand core that can be made and the weight of the single-mold sand core.

[0035] In order to ensure the accuracy of the core sand after mixing, the amount of raw sand weighed by the weighing bucket 210 each time can be set according to the weight of the sand core to be manufactured, so as to ensure that the mixed core sand has the required fluidity within the use time.

[0036] For example, when making a 5KG sand core, 15KG of core sand can be mixed, and the mixed core sand can be used 3 times. When making a 2KG sand core, because the production cycle of a small sand core is short, 10KG of core sand can be mixed, and the mixed core sand can be used 5 times.

[0037] Furthermore, mixing the raw sand and the binder includes: setting sand mixing parameters according to the weight of the sand core and the process formula, and the sand mixing parameters include the amount of raw sand added, the amount of binder added, the amount of auxiliary materials added and the sand mixing time.

[0038] Furthermore, the sand mixing parameters are set according to the weight of the sand core and the process formula, including: σ=gs / Gs, where σ is an adjustable parameter, gs is the weight of the binder, and Gs is the weight of the core sand. This restriction makes the prepared mixed core sand more suitable for making sand cores, so that the quality of the prepared sand cores is more uniform.

[0039] Furthermore, the sand mixing parameters are set according to the weight of the sand core and the process formula, including: GH≤K*Gh, where GH is the weight of the mixed core sand; K is the coefficient, and Gh is the weight of the core sand required for each mold. By limiting the amount of mixed core sand prepared each time, "mix and use immediately" is achieved, and there is no need for waiting time after sand mixing.

[0040] In some embodiments, mixing the raw sand and the binder includes: adding two components of the binder to the sand mixing drum 310 for mixing at the same time, and preparing mixed core sand for making sand cores at one time. This method requires that the amount of sand mixed in the sand mixing drum 310 for each batch is the amount required for core making, which can ensure that the sand is mixed and used immediately.

[0041] In other embodiments, mixing the raw sand and the binder includes: after the weighing bucket 210 completes weighing, the raw sand is first mixed with the first binder or auxiliary material in the weighing bucket 210 to form a single component material for standby use; when mixed core sand is needed for core making, the single component material in the weighing bucket 210 is quantitatively added to the sand mixing drum 310 according to the required amount of mixed sand core, and the second binder is added to the sand mixing drum 310.

[0042] The reason why the mixed core sand will slowly solidify is that the two components of the binder gradually solidify after chemical reaction, so the mixed core sand needs to be used as soon as possible; when the original sand is added with a binder (or additive) and mixed first, the binder mixture will not solidify in a short time and has a longer durability time.

[0043] The core making process provided by the present invention is implemented by a PLC (Programmable Logic Controller) controller, and the specific working process is as follows:

[0044] The data reading device 430 automatically reads the parameters of the core box 420, obtains the weight of the sand core, and the relevant process formula data, and transmits them to the PLC controller 110; the PLC controller 110 sets the sand mixing parameters (including the amount of raw sand added, the amount of binder added, the amount of auxiliary materials added, the sand mixing time, etc.) of the sand mixing unit according to the weight of the sand core and the process formula according to the set calculation method; on the other hand, the height of the relevant feeding material level in the sand cylinder 410 of the core making unit is calculated and calibrated, and detected by the sand level sensor 360;

[0045] The modulus of sand cores that can be produced after one mixing is calculated based on the weight of the single-mold sand core to be produced and the storage time of the raw sand after mixing. The weight of the mixed core sand is calculated based on the modulus of sand cores that can be produced.

[0046] The weighing bucket 210 weighs the raw sand according to the output value of the PLC controller 110, and adds the weighed raw sand into the sand mixing drum 310. The binder is also added into the sand mixing drum 310 according to the added value calculated by the PLC controller 110 according to the actual raw sand addition amount and the process ratio value; the sand mixing drum 310 mixes the raw sand and the binder;

[0047] When the core-making unit sand cylinder 410 moves to the sand discharge station, the sand level sensor 360 detects that the raw sand level in the sand-making cylinder is at the "sand dischargeable" level, and the sand discharge valve 340 on the sand mixing cylinder 310 opens to add all the mixed raw sand into the core-making unit sand cylinder 410. At the same time, the sand level sensor 360 detects the final mixed core sand position and transmits it to the PLC controller 110, which calculates the next sand mixing amount and performs sand mixing preparation;

[0048] During the entire sand core mixing process, the PLC controller 110 can calculate the amount of raw sand to be mixed in the next round according to the production conditions of each round, so as to achieve "mix now and use now" without waiting time after sand mixing, thereby avoiding long-term exposure of mixed core sand to cause poor fluidity and affect the core making quality.

[0049] A second aspect of an embodiment of the present invention provides a core making unit to alleviate the technical problem in the related art that the core making process easily causes poor quality of core sand.

[0050] The core making unit provided in the embodiment of the present invention comprises: a control system, and a weighing mechanism, a sand mixing mechanism and a core making mechanism respectively connected to the control system signals, and the weighing mechanism, the sand mixing mechanism and the core making mechanism are connected in sequence.

[0051] Further, the weighing mechanism includes a weighing bucket 210 and a weighing sensor 220, the weighing sensor 220 is arranged on the weighing bucket 210, and is connected to the control system signal;

[0052] The sand mixing mechanism includes a sand mixing cylinder 310 , and a first feeding port 320 and a second feeding port 330 both for adding binder. The first feeding port 320 and the second feeding port 330 are both arranged on the sand mixing cylinder 310 , or the first feeding port 320 is arranged on the weighing bucket 210 , and the second feeding port 330 is arranged on the sand mixing cylinder 310 .

[0053] like Figure 1 As shown, the weighing mechanism, the sand mixing mechanism and the core making mechanism are arranged in sequence from top to bottom and are interconnected. The control system includes a PLC (Programmable Logic Controller, English full name: Programmable Logic Controller) controller. Specifically, the PLC controller 110 is respectively connected to the weighing mechanism, the sand mixing mechanism and the core making mechanism by signal. The PLC controller 110 controls the weighing mechanism to weigh the raw materials according to the working conditions of each round of production. The weighed raw materials are added to the sand mixing mechanism. The sand mixing mechanism adds the mixed core sand formed by mixing to the core making mechanism, and the core making mechanism makes the sand core.

[0054] Furthermore, the weighing mechanism includes a weighing bucket 210 and a weighing sensor 220 . The weighing sensor 220 is disposed on the weighing bucket 210 and is connected to the control system signal.

[0055] like Figure 1 As shown, the weighing bucket 210 is funnel-shaped and arranged in the vertical direction. The weighing sensor 220 and the weighing bucket 210 are both installed on the support frame. The upper ends of the weighing bucket 210 are provided with measuring plates on both sides. There are two weighing sensors 220, which are arranged on both sides of the weighing bucket 210 and are in contact with the corresponding measuring plates. In the process of weighing the raw sand, the raw sand is added into the weighing bucket 210. The weighing sensor 220 detects the weight of the raw sand in the weighing bucket 210 in real time and transmits the detected weight to the PLC controller 110. When the weight of the raw sand reaches the required weight, the PLC controller 110 controls to stop adding raw sand into the weighing bucket 210 and adds the weighed raw sand in the weighing bucket 210 to the sand mixing mechanism.

[0056] Furthermore, a first discharge valve is provided at the discharge port of the weighing hopper 210, and the first discharge valve is connected to the control system signal.

[0057] Specifically, the lower end of the weighing hopper 210 is its discharge port, and the discharge port of the weighing hopper 210 is connected to the feed port of the sand mixing mechanism. The first discharge valve is provided at the discharge port to control the opening or closing of the discharge port. When the weight of the raw sand reaches the required weight, the PLC controller 110 controls to stop adding raw sand to the weighing hopper 210. When the core sand needs to be mixed, the PLC controller 110 controls the first discharge valve to open, and the raw sand in the weighing hopper 210 enters the sand mixing mechanism, so that the raw sand is automatically added to the sand mixing mechanism.

[0058] In some embodiments, Figure 2 As shown, the sand mixing mechanism includes a sand mixing cylinder 310 , and a first feeding port 320 and a second feeding port 330 both for adding a binder. The first feeding port 320 and the second feeding port 330 are both disposed on the sand mixing cylinder 310 .

[0059] The sand mixing cylinder 310 is arranged below the weighing bucket 210, and the feed port of the sand mixing cylinder 310 is arranged opposite to the discharge port of the weighing bucket 210. The first feeding port 320 and the second feeding port 330 are both arranged at the feed port of the sand mixing cylinder 310. The first feeding port 320 and the second feeding port 330 are respectively used to add different components of adhesive into the sand mixing cylinder 310.

[0060] When mixing the core sand, the first feeding port 320 and the second feeding port 330 simultaneously add the first binder and the second binder into the sand mixing drum 310 and mix them with the raw sand. The amount of mixed core sand prepared in each batch in the sand mixing drum 310 is the amount required for core making, which can ensure that it is mixed and used immediately.

[0061] In other embodiments, Figure 3 As shown, the weighing mechanism includes a weighing bucket 210 and a weighing sensor 220. The weighing sensor 220 is disposed on the weighing bucket 210 and is connected to the control system signal;

[0062] The sand mixing mechanism includes a sand mixing cylinder 310 , and a first feeding port 320 and a second feeding port 330 both for adding a binder. The first feeding port 320 is disposed on the weighing hopper 210 , and the second feeding port 330 is disposed on the sand mixing cylinder 310 .

[0063] When mixing core sand, the first binder is added to the weighing bucket 210 through the first feeding port 320, and more single-component materials can be mixed for standby use. When core making requires mixed core sand, the single-component materials are added from the weighing bucket 210 to the sand mixing cylinder 310, and the second binder is added to the sand mixing cylinder 310 through the second feeding port 330, and mixed core sand is obtained after final mixing.

[0064] The main reason why the mixed core sand will slowly solidify is that the two components of the mixed core sand gradually solidify after chemical reaction, so the prepared mixed core sand needs to be used as soon as possible; when the original sand is added with a binder (or additive) and mixed first, the binder mixture will not solidify too quickly and has a longer durability time.

[0065] Furthermore, a sand discharge valve 340 and a sand discharge channel 350 are provided at the discharge port of the sand mixing cylinder 310 . The sand discharge valve 340 is connected to a control system signal to control the connection or disconnection between the sand mixing cylinder 310 and the sand discharge channel 350 .

[0066] like Figure 1As shown, the lower sand channel 350 is connected to the discharge port of the sand mixing cylinder 310 and is arranged in the vertical direction. The sand release valve 340 is installed at the discharge port of the sand mixing cylinder 310 and is connected to the PLC controller 110 by signal. When it is necessary to add mixed core sand to the core making mechanism, the PLC controller 110 controls the sand release valve 340 to open, and the mixed core sand in the sand mixing cylinder 310 enters the core making mechanism through the lower sand channel 350, thereby automatically adding the mixed core sand to the core making mechanism.

[0067] Furthermore, a sand material level sensor 360 connected to the control system signal is provided at the lower end of the sand discharging channel 350, and the sand material level sensor 360 is used to detect the material level in the core making mechanism.

[0068] Specifically, the sand material level sensor 360 is installed at the lower end of the sand lowering channel 350 and is connected to the PLC controller 110 by signal. The detection end of the sand material level sensor 360 is arranged opposite to the core making mechanism and is used to detect the material level in the core making mechanism. When the sand material level sensor 360 detects that the raw sand material level of the core making mechanism is at the "sand can be placed" material level, the sand release valve 340 on the sand mixing cylinder 310 is opened to add the mixed core sand in the sand mixing cylinder 310 to the core making mechanism. At the same time, the sand material level sensor 360 detects the last mixed core sand position and transmits it to the PLC controller 110, which calculates the next sand mixing amount and performs sand mixing preparation.

[0069] Furthermore, the core making mechanism includes a core making unit sand cylinder 410 , a core making core box 420 and a data reading device 430 . The core making unit sand cylinder 410 is located below the lower sand channel 350 and is used to transport the mixed core sand to the core making core box 420 . The data reading device 430 is arranged in the core making core box 420 .

[0070] like Figure 1 As shown, the core-making unit sand cylinder 410 is arranged below the sand mixing cylinder 310, and the feed port of the core-making unit sand cylinder 410 is arranged opposite to the lower sand channel 350. The core-making unit sand is used to transport the mixed core sand to the core-making core box 420, and the data reading device 430 is used to read relevant data and transmit it to the PLC controller 110.

[0071] Furthermore, the core making unit further comprises a sand storage hopper 500, and the sand storage hopper 500 is arranged above the weighing mechanism.

[0072] like Figure 1 As shown, the sand storage hopper 500 is arranged above the weighing hopper 210, the discharge port of the sand storage hopper 500 is arranged opposite to the feed port of the weighing hopper 210, and the discharge port of the sand storage hopper 500 is provided with a second discharge valve, and the second discharge valve is connected to the PLC controller 110 signal.

[0073] When raw sand needs to be added to the weighing bucket 210, the PLC controller 110 controls the second discharging valve to open, and the raw sand in the sand storage bucket 500 is added to the weighing bucket 210. At the same time, the weighing sensor 220 weighs the weight of the raw sand in the weighing bucket 210. When the raw sand in the weighing bucket 210 reaches the required amount, the PLC controller 110 controls the second discharging valve to close, stops adding raw sand to the weighing bucket 210, and realizes automatic addition of raw sand to the weighing bucket 210.

[0074] Compared with the core making unit in the related art that stores mixed core sand, the core making unit provided in the embodiment of the present invention eliminates the transition sand storage hopper 500. The weighing mechanism weighs the raw sand required for core making once or multiple times each time, and adds the weighed raw sand to the sand mixing mechanism for mixing to form mixed core sand. The mixed core sand is added to the core making mechanism and used up in the shortest time (within the effective use time of the raw sand), thereby avoiding long-term exposure of the mixed core sand to cause poor fluidity and affect the core making quality. In addition, since the transition sand storage hopper 500 is omitted, the detection switch and structure are saved, and the overall height of the core making unit is reduced, thereby reducing the occupied space.

[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A core making process, characterized in that: include: According to the information of the sand core, calculate the weight of the core sand to be mixed once; Mixing raw sand and a binder to prepare mixed core sand; directly adding the mixed core sand into a core making unit; The weight of the core sand to be mixed once is calculated as follows: Calculate the number of sand core modules that can be made after mixing according to the time of making a sand core and the storage time of the mixed core sand; The weight of the mixed core sand is calculated according to the number of sand core modules that can be produced and the weight of the single-mode sand core.

2. The core making process according to claim 1, characterized in that: The mixing of raw sand and binder comprises: The sand mixing parameters are set according to the weight of the sand core and the process formula, and the sand mixing parameters include the amount of raw sand added, the amount of binder added, the amount of auxiliary materials added and the sand mixing time.

3. The core making process according to claim 2, characterized in that: The setting of the sand mixing parameters according to the weight of the sand core and the process formula includes: σ=gs / Gs, wherein σ is an adjustable parameter, gs is the weight of the binder, and Gs is the weight of the core sand.

4. The core making process according to claim 2, characterized in that: The setting of the sand mixing parameters according to the weight of the sand core and the process formula includes: GH≤K*Gh, wherein GH is the weight of the mixed core sand; K is a coefficient, and Gh is the weight of the core sand required for each mold.

5. The core making process according to claim 1, characterized in that: The mixing of raw sand and binder includes: mixing one or more binders with raw sand to form mixed core sand.

6. The core making process according to claim 1, characterized in that: The mixing of raw sand and binder comprises: firstly mixing raw sand with a first binder or auxiliary material to form a single component material for standby use; when mixed core sand is needed for core making, adding a second binder to the single component material.

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