Riser pressurizing device and pressurizing method thereof

Abstract

The invention discloses a riser pressurizing device and a pressurizing method thereof, which belong to the field of casting technology, and include a carrier frame, a side plate and a top plate, wherein the two ends of the side plate are fixedly connected to the carrier frame and the top plate respectively, and further include: an upper mold connected to a pushing mechanism installed on the top plate; a lower mold installed on the carrier frame and forming a molding cavity with the upper mold; a pushing mechanism installed on the top plate and used for pushing the upper mold to perform linear motion; a pressurizing mechanism installed on the upper mold and used for pressurizing the molding cavity; a temperature control mechanism installed on the carrier frame and used for cooling the lower mold and the upper mold; a detection mechanism used for detecting the displacement distance of the upper mold, the pressure between the lower mold and the upper mold, the pressure in the molding cavity, and the temperature in the molding cavity; the invention can perform pressurization on the riser, and can control the pressure in the molding cavity and the temperature drop rate of the casting, so as to improve the molding quality of the casting.

Description

Technical Field

[0001] The invention belongs to the technical field of casting, and in particular relates to a riser pressurizing device and a pressurizing method thereof. Background Art

[0002] Gravity casting is the most commonly used casting method in the casting field. At present, the static pressure of molten metal in the gate and riser is used to compensate for the shrinkage of the product. The compensation effect depends on the gravity (static pressure) generated by the height of the molten metal poured in the gate and riser. Therefore, excessive molten metal must be injected, resulting in a large amount of residual gate and riser heads in the gate and riser after compensation, which reduces the process yield, wastes materials and energy, and has high production costs.

[0003] The Chinese patent with announcement number CN111702133B proposes a pressure-adding device for a riser, comprising a casting machine body and a hydraulic cylinder, wherein a top plate is arranged above the casting machine body, support rods are fixedly arranged on both sides of the lower surface of the top plate, and the lower ends of the two support rods are fixedly connected to the corresponding two sides of the upper surface of the casting machine body, the hydraulic cylinder is fixedly arranged on the lower surface of the top plate, a lower mold is fixedly arranged on the upper surface of the casting machine body, an upper mold is fixedly arranged at the end of the piston rod of the hydraulic cylinder, cavities are opened inside the lower mold and the upper mold, gates and risers are respectively arranged at both ends of the upper surface of the upper mold, and the gates and risers are connected to the corresponding cavities, and rotating rods are rotatably arranged on both sides of the lower mold through rolling bearings. The pressure-adding device for the riser can conveniently pressurize the riser, and effectively improve the process yield of the product;

[0004] Although the technical solution proposed in the above patent can conveniently pressurize the riser, the pressure in the cavity will decrease as the temperature of the casting decreases, and maintaining the pressure stable in the molding cavity is helpful for the molding of the casting. At the same time, the above patent does not control the temperature drop rate of the casting well, and the appropriate temperature drop rate helps to ensure the molding quality of the casting. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a riser pressurizing device and a pressurizing method thereof, which solve the above-mentioned problems.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a riser pressurizing device and a pressurizing method thereof, comprising a bearing frame, a side plate and a top plate, wherein the two ends of the side plate are fixedly connected to the bearing frame and the top plate respectively, and further comprising:

[0007] an upper die connected to a push mechanism mounted on the top plate;

[0008] The lower mold is installed on the carrier frame and forms a molding cavity with the upper mold;

[0009] A pushing mechanism, mounted on the top plate, is used to push the upper die to perform linear motion;

[0010] A pressurizing mechanism, installed on the upper mold, for pressurizing the molding cavity;

[0011] A temperature control mechanism, installed on the carrier, is used to cool the lower mold and the upper mold;

[0012] A detection mechanism is used to detect the displacement distance of the upper die, the pressure between the lower die and the upper die, the pressure in the molding cavity, and the temperature in the molding cavity;

[0013] Wherein, the temperature control mechanism includes an oil tank, a first pipe, a second pipe, a third pipe and a pump body, the oil tank is fixedly connected to the lower end of the support frame, one end of the first pipe extends into the oil tank and the other end passes through the lower mold, one end of the first pipe passes through the lower mold and is plugged and connected to the end of the second pipe embedded in the upper mold, one end of the third pipe extends into the oil tank and the other end passes through the lower mold, one end of the third pipe passes through the lower mold and is plugged and connected to the other end of the second pipe embedded in the upper mold, one end of the first pipe extending into the oil tank is fixedly connected to the output end of the pump body fixedly installed in the oil tank, and a cooling device for cooling the oil in the oil tank and a heating mechanism for heating are provided in the oil tank.

[0014] On the basis of the above technical solution, the present invention also provides the following optional technical solution:

[0015] Further technical solution: The pushing mechanism includes a first linear moving part, a first joint, a second joint and a first pressure sensor. The first linear moving part is detachably connected to the top plate. The first joint is sleeved on the output shaft of the first linear moving part and fixedly connected to the first linear moving part. The second joint is rotatably connected to the first pressure sensor fixedly connected to the upper mold, and the second joint is threadedly connected to the first joint.

[0016] Further technical solution: The pressurizing mechanism includes a plunger head, and the two plunger heads are slidably connected to the gate and the riser opened on the upper mold, and also includes:

[0017] The pushing assembly is installed on the upper die and is used to push the plunger head to perform linear movement in the vertical direction.

[0018] Further technical solution: The pushing assembly includes a mounting plate, a motor, a supporting plate and a second linear moving part, the mounting plate is fixedly connected to the upper mold, the motor is detachably connected to the mounting plate, the supporting plate is fixedly connected to the output shaft of the motor, the second linear moving part is detachably connected to the supporting plate, and the output shaft of the second linear moving part is fixedly connected to the plunger head.

[0019] Further technical solution: The detection mechanism includes a first pressure sensor for detecting the pressure between the upper die and the lower die, and also includes:

[0020] A displacement sensor is installed on the upper die and is used to detect the displacement distance of the upper die;

[0021] The temperature sensor is installed at the bottom of the lower mold to detect the temperature in the molding cavity to obtain the temperature drop rate of the casting;

[0022] The pressure sensor is embedded and installed at the bottom end of the plunger head to detect the pressure in the molding cavity.

[0023] Further technical solution: A stabilizing plate is rotatably connected to the output shaft of the first linear motion member, and the stabilizing plate is slidably matched with a limiting sliding groove provided on the side plate.

[0024] A method for pressurizing a riser using a riser pressurizing device comprises the following steps:

[0025] S1, using the first linear motion member to push the first joint to drive the second joint to perform linear motion in the vertical direction, and the second joint to push the first pressure sensor to drive the upper mold to perform linear motion in the vertical direction, so that the upper mold presses against the lower mold and the first pipe and the third pipe are correspondingly inserted into the two ends of the second pipe so that the lower mold and the upper mold fit together to form a molding cavity;

[0026] S2, using a displacement sensor to obtain displacement information of the upper mold, and using a first pressure sensor to obtain the pressing pressure information between the lower mold and the upper mold. When the displacement information and the pressing pressure information are within the corresponding displacement threshold and pressing pressure threshold, it indicates that the upper mold has initially reached the preset position. At this time, the upper mold is continuously pushed and the obtained displacement information and pressing pressure information are imported into the cavity condition model after dimensionless processing to obtain the cavity condition coefficient. If the obtained cavity condition coefficient is within the cavity condition coefficient threshold, it indicates that the upper mold has reached the specified position. If the cavity condition coefficient is not within the cavity condition coefficient threshold, the first linear motion member is continuously started to push the upper mold to press the lower mold until the cavity condition coefficient is within the cavity condition coefficient threshold.

[0027] S3, introducing the casting liquid from the riser into the molding cavity, after the introduction is completed, starting the motor to drive the bearing plate to push the plunger head to rotate in the horizontal direction, so that the two plunger heads are respectively located above the gate and the riser, and then starting the two second linear motion parts to correspondingly push the two plunger heads connected thereto to perform linear motion in the vertical direction, so that the two plunger heads are correspondingly inserted into the gate and the riser, and the casting liquid in the molding cavity is pressurized, and at the same time, the pump body is started to guide the oil cooled / heated by the cooling device / heating device into the first pipeline and flows into the third pipeline through the second pipeline, and finally flows into the oil tank through the third pipeline, and the lower mold and the upper mold are temperature-controlled, so that the temperature drop rate of the casting in the molding cavity is kept within the temperature drop rate threshold until the casting reaches room temperature;

[0028] S4, using a temperature sensor to obtain the temperature drop rate of the casting, using a pressure sensor to obtain the pressure information in the molding cavity, and comparing the two with the preset temperature drop rate threshold and pressure threshold. If the temperature drop rate is not within the corresponding threshold, the temperature control mechanism is started to control the temperature drop rate. If the pressure information is not within the pressure threshold, the second linear motion member is started to push the plunger head to change the pressure information, so that the pressure information is within the pressure threshold. When the temperature drop rate information and the pressure information are both within the corresponding temperature drop rate threshold and pressure threshold, the temperature drop rate information and the pressure information are dimensionlessly processed and introduced into the pressurized molding model to derive the pressurized molding coefficient. The obtained pressurized molding coefficient is compared with the preset pressurized molding coefficient threshold. If the pressurized molding coefficient is not within the pressurized molding coefficient threshold, the pressurizing mechanism and the temperature control mechanism are started to adjust the temperature drop rate information and the pressure information until the pressurized molding coefficient is within the pressurized molding coefficient threshold.

[0029] S5. Import the pressurized molding coefficient and the cavity condition coefficient within the pressurized molding coefficient threshold into the molding evaluation model to obtain the molding evaluation index, and compare the obtained molding evaluation index with the preset index threshold. If the molding evaluation index is not within the index threshold, then under the condition that the pressurized molding coefficient is within the pressurized molding coefficient threshold, adjust the pressurized molding coefficient to bring the molding evaluation index within the index threshold until the casting is formed.

[0030] Further technical solution: The expression of the cavity condition model is:

[0031] ;

[0032] represents the cavity condition coefficient, Represents displacement information, Indicates the pressure information. represents the displacement influence factor, represents the impact factor of the pressure, , , .

[0033] Further technical solution: The expression of the pressurized forming model is:

[0034] ;

[0035] in, is the compression molding coefficient, represents the molding cavity volume, Indicates pressure information, Indicates the temperature drop rate information. Represents the average of the upper and lower limits of the pressure threshold, It represents the average of the upper and lower limits of the temperature drop rate threshold. Indicates the factors affecting molding quality, Indicates the lower limit of the pressure threshold, Indicates the lower limit of the temperature drop rate threshold.

[0036] Further technical solution: The expression of the molding evaluation model is:

[0037] ;

[0038] in, represents the molding evaluation index, represents the cavity condition coefficient, Indicates the compression molding coefficient, Represents the influencing factor of cavity condition coefficient, Indicates the influencing factor of the press forming coefficient, , .

[0039] The present invention provides a riser pressurizing device and a pressurizing method thereof, which have the following beneficial effects compared with the prior art:

[0040] The first linear motion member is used to push the first joint to drive the second joint to perform linear movement in the vertical direction. The second joint pushes the first pressure sensor to drive the upper mold to perform linear movement in the vertical direction, so that the upper mold is pressed against the lower mold, and at the same time, the first pipe and the third pipe are correspondingly inserted into the two ends of the second pipe so that the lower mold and the upper mold fit together. The two constitute a molding cavity, and the casting liquid is introduced from the riser into the molding cavity. After the introduction is completed, the motor is started to drive the bearing plate to push the plunger head to rotate in the horizontal direction, so that the two plunger heads are respectively located above the gate and the riser. At this time, the two second linear motion members are started to correspondingly push the two plunger heads connected thereto to perform linear movement in the vertical direction. The pump body is activated to cause the two plunger heads to be inserted into the gate and the riser correspondingly, and the casting liquid in the molding cavity is pressurized to achieve pressurized shrinkage compensation for the casting liquid. At the same time, the temperature in the molding cavity is detected in real time by the temperature sensor to obtain the temperature drop rate of the casting. If the temperature drop rate of the casting is not within the temperature drop rate threshold, the pump body is activated to guide the oil cooled / heated by the cooling device / heating device into the first pipeline and into the third pipeline through the second pipeline, and finally into the oil tank through the third pipeline, and the lower mold and the upper mold are temperature-controlled to cause the temperature drop rate of the casting in the molding cavity to be kept within the temperature drop rate threshold until the casting reaches room temperature;

[0041] The cooperation of the first pipeline, the second pipeline and the third pipeline in the present invention not only promotes the circulation of oil, but also can position the upper mold and the lower mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0043] Figure 2 It is a schematic diagram of the overall structure of the present invention.

[0044] Figure 3 For the present invention Figure 2 Enlarged schematic diagram of the structure of part A in the middle.

[0045] Figure 4 It is a structural schematic diagram of the pressurizing mechanism of the present invention.

[0046] Figure 5 It is a structural schematic diagram of the pushing mechanism of the present invention.

[0047] Figure 6 For the present invention Figure 5 Enlarged schematic diagram of the structure of part B in the middle.

[0048] Notes on figure numbers: 1. support frame; 2. side plate; 3. top plate; 4. lower mold; 5. upper mold; 501. gate; 502. riser; 6. pushing mechanism; 601. first linear motion member; 602. stabilizing plate; 603. first joint; 604. second joint; 605. first pressure sensor; 7. pressurizing mechanism; 701. plunger head; 702. pushing assembly; 7021. mounting plate; 7022. motor; 7023. support plate; 7024. second linear motion member; 8. temperature control mechanism; 801. oil tank; 802. first pipeline; 803. second pipeline; 804. third pipeline; 805. pump body. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0050] The specific implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0051] See also Figures 1 to 6 , provided in one embodiment of the present invention, is a riser pressurizing device and a pressurizing method thereof, comprising a bearing frame 1, a side plate 2 and a top plate 3, wherein both ends of the side plate 2 are fixedly connected to the bearing frame 1 and the top plate 3, and further comprising:

[0052] The upper mold 5 is connected to a pushing mechanism 6 installed on the top plate 3;

[0053] The lower mold 4 is mounted on the carrier frame 1 and forms a molding cavity with the upper mold 5;

[0054] A pushing mechanism 6 is installed on the top plate 3 and is used to push the upper mold 5 to perform linear motion;

[0055] A pressurizing mechanism 7, mounted on the upper mold 5, for pressurizing the molding cavity;

[0056] The temperature control mechanism 8 is installed on the carrier 1 and is used to cool the lower mold 4 and the upper mold 5;

[0057] A detection mechanism is used to detect the displacement distance of the upper mold 5, the pressure between the lower mold 4 and the upper mold 5, the pressure in the molding cavity, and the temperature in the molding cavity;

[0058] Among them, the temperature control mechanism 8 includes an oil tank 801, a first pipeline 802, a second pipeline 803, a third pipeline 804 and a pump body 805, the oil tank 801 is fixedly connected to the lower end of the carrier frame 1, one end of the first pipeline 802 extends into the oil tank 801 and the other end passes through the lower mold 4, one end of the first pipeline 802 passes through the lower mold 4 and is plugged and connected to the end of the second pipeline 803 embedded in the upper mold 5, one end of the third pipeline 804 extends into the oil tank 801 and the other end passes through the lower mold 4, one end of the third pipeline 804 passes through the lower mold 4 and is plugged and connected to the other end of the second pipeline 803 embedded in the upper mold 5, one end of the first pipeline 802 extends into the oil tank 801 and is fixedly connected to the output end of the pump body 805 fixedly installed in the oil tank 801, and the oil tank 801 is provided with a cooling device for cooling the oil in the oil tank 801 and a heating mechanism for heating.

[0059] Preferably, the pushing mechanism 6 includes a first linear moving member 601, a first joint 603, a second joint 604 and a first pressure sensor 605. The first linear moving member 601 is detachably connected to the top plate 3. The first joint 603 is sleeved on the output shaft of the first linear moving member 601 and is fixedly connected to the first linear moving member 601. The second joint 604 is rotatably connected to the first pressure sensor 605 fixedly connected to the upper mold 5. The second joint 604 is threadedly connected to the first joint 603. The purpose of this arrangement is to utilize the first linear moving member 6 01 pushes the first joint 603 to drive the second joint 604 to perform linear movement in the vertical direction. The second joint 604 drives the first pressure sensor 605 to drive the upper mold 5 to perform linear movement in the vertical direction, so that the upper mold 5 presses against the lower mold 4 while the first pipe 802 and the third pipe 804 are correspondingly inserted into the two ends of the second pipe 803 (the cooperation of the first pipe 802, the second pipe 803 and the third pipe 804 not only promotes the circulation of oil, but also can position the upper mold 5 and the lower mold 4) so ​​that the lower mold 4 and the upper mold 5 fit together, and the two form a molding cavity.

[0060] Preferably, a stabilizing plate 602 is rotatably connected to the output shaft of the first linear motion member 601, and the stabilizing plate 602 slidably cooperates with a limiting slide groove (not shown in the figure) provided on the side plate 2. The purpose of this arrangement is to increase the stability of the linear motion of the upper mold 5 in the vertical direction and prevent the upper mold 5 from shaking and deforming during the movement.

[0061] Preferably, the pressurizing mechanism 7 includes a plunger head 701, and the two plunger heads 701 are slidably connected to the gate 501 and the riser 502 opened on the upper mold 5, and further includes:

[0062] The pushing assembly 702 is installed on the upper mold 5 and is used to push the plunger head 701 to perform linear movement in the vertical direction;

[0063] The pushing assembly 702 includes a mounting plate 7021, a motor 7022, a bearing plate 7023 and a second linear motion member 7024. The mounting plate 7021 is fixedly connected to the upper mold 5. The motor 7022 is detachably connected to the mounting plate 7021. The bearing plate 7023 is fixedly connected to the output shaft of the motor 7022. The second linear motion member 7024 is detachably connected to the bearing plate 7023. The output shaft of the second linear motion member 7024 is fixedly connected to the plunger head 701. After the lower mold 4 and the upper mold 5 form a molding cavity, relevant technicians will cast The casting liquid is introduced into the molding cavity from the riser 502. After the introduction is completed, the motor 7022 is started to drive the bearing plate 7023 to push the plunger head 701 to rotate in the horizontal direction, so that the two plunger heads 701 are respectively located above the gate 501 and the riser 502. At this time, the two second linear motion members 7024 are started to correspondingly push the two plunger heads 701 connected thereto to perform linear motion in the vertical direction, so that the two plunger heads 701 are correspondingly inserted into the gate 501 and the riser 502, and the casting liquid in the molding cavity is pressurized to achieve pressurized shrinkage compensation treatment of the casting liquid;

[0064] Preferably, the detection mechanism includes a first pressure sensor 605 for detecting the pressure between the upper mold 5 and the lower mold 4, and further includes:

[0065] A displacement sensor is installed on the upper die 5 and is used to detect the displacement distance of the upper die 5;

[0066] A temperature sensor is installed at the bottom of the lower mold 4 to detect the temperature in the molding cavity to obtain the temperature drop rate of the casting;

[0067] A pressure sensor is embedded and installed at the bottom of the plunger head 701 to detect the pressure in the molding cavity;

[0068] In the embodiment of the present invention, the first linear motion member 601 is used to push the first joint 603 to drive the second joint 604 to perform linear movement in the vertical direction, and the second joint 604 pushes the first pressure sensor 605 to drive the upper mold 5 to perform linear movement in the vertical direction, so that the upper mold 5 is pressed against the lower mold 4, and at the same time, the first pipeline 802 and the third pipeline 804 are correspondingly inserted into the two ends of the second pipeline 803 (the cooperation of the first pipeline 802, the second pipeline 803 and the third pipeline 804 not only promotes the circulation of oil, but also can position the upper mold 5 and the lower mold 4) so ​​that the lower mold 4 and the upper mold 5 fit together, and the two form a molding cavity, and the casting liquid is introduced from the riser 502 into the molding cavity. After the introduction is completed, the motor 7022 is started to drive the bearing plate 7023 to push the plunger head 701 to rotate in the horizontal direction, so that the two plunger heads 701 are respectively located at the gate 501 and the riser 502. Directly above, the two second linear motion members 7024 are started to push the two plunger heads 701 connected thereto to perform linear motion in the vertical direction, so that the two plunger heads 701 are inserted into the gate 501 and the riser 502 respectively, and the casting liquid in the molding cavity is pressurized to achieve pressurized shrinkage compensation treatment of the casting liquid. At the same time, the temperature in the molding cavity is detected in real time by a temperature sensor to obtain the temperature drop rate of the casting. If the temperature drop rate of the casting is not within the temperature drop rate threshold, the pump body 805 is started to guide the oil cooled / heated by the cooling device / heating device into the first pipeline 802 and flows into the third pipeline 804 through the second pipeline 803, and finally flows into the oil tank 801 through the third pipeline 804, and the lower mold 4 and the upper mold 5 are temperature-controlled, so that the temperature drop rate of the casting in the molding cavity is kept within the temperature drop rate threshold until the casting reaches room temperature.

[0069] The method for pressurizing the riser by the riser pressurizing device comprises the following steps:

[0070] S1. The first linear motion member 601 is used to push the first joint 603 to drive the second joint 604 to perform linear motion in the vertical direction. The second joint 604 pushes the first pressure sensor 605 to drive the upper mold 5 to perform linear motion in the vertical direction, so that the upper mold 5 presses against the lower mold 4 and the first pipe 802 and the third pipe 804 are correspondingly inserted into the two ends of the second pipe 803 so that the lower mold 4 and the upper mold 5 fit together to form a molding cavity.

[0071] S2, using the displacement sensor to obtain the displacement information of the upper mold 5, and using the first pressure sensor 605 to obtain the pressing pressure information between the lower mold 4 and the upper mold 5. When the displacement information and the pressing pressure information are within the corresponding displacement threshold and pressing pressure threshold, it means that the upper mold 5 has initially reached the preset position. At this time, the upper mold 5 is continuously pushed and the obtained displacement information and pressing pressure information are imported into the cavity condition model after dimensionless processing to obtain the cavity condition coefficient. If the obtained cavity condition coefficient is within the cavity condition coefficient threshold, it means that the upper mold 5 has reached the specified position. If the cavity condition coefficient is not within the cavity condition coefficient threshold, the first linear motion part 601 is continuously started to push the upper mold 5 to press against the lower mold 4 until the cavity condition coefficient is within the cavity condition coefficient threshold (this setting can cause the upper mold 5 to press against the lower mold 4. If the pressing pressure between the upper mold 5 and the lower mold 4 is insufficient, the casting liquid will be lost. If the pressing pressure between the upper mold 5 and the lower mold 4 is too large, the upper mold 5 and the lower mold 4 will be deformed, causing the casting to fail);

[0072] S3, introducing the casting liquid from the riser 502 into the molding cavity, after the introduction is completed, start the motor 7022 to drive the bearing plate 7023 to push the plunger head 701 to rotate in the horizontal direction, so that the two plunger heads 701 are respectively located above the gate 501 and the riser 502, and then start the two second linear motion members 7024 to correspondingly push the two plunger heads 701 connected thereto to perform linear motion in the vertical direction, so that the two plunger heads 701 are correspondingly inserted into the gate 501 and the riser 502, and the casting liquid in the molding cavity is pressurized, and at the same time, the pump body 805 is started to introduce the oil cooled / heated by the cooling device / heating device into the first pipeline 802 and flow into the third pipeline 804 through the second pipeline 803, and finally flow into the oil tank 801 through the third pipeline 804, and the lower mold 4 and the upper mold 5 are temperature-controlled, so that the temperature drop rate of the casting in the molding cavity is kept within the temperature drop rate threshold until the casting reaches room temperature;

[0073] S4, using a temperature sensor to obtain the temperature drop rate of the casting, using a pressure sensor to obtain the pressure information in the molding cavity, and comparing the two with the preset temperature drop rate threshold and pressure threshold. If the temperature drop rate is not within the corresponding threshold, the temperature control mechanism 8 is started to control the temperature drop rate. If the pressure information is not within the pressure threshold, the second linear motion member 7024 is started to push the plunger head 701 to change the pressure information, so that the pressure information is within the pressure threshold. When the temperature drop rate information and the pressure information are both within the corresponding temperature drop rate threshold and pressure threshold, the temperature drop rate information and the pressure information are dimensionlessly processed and introduced into the pressurized molding model to derive the pressurized molding coefficient. The obtained pressurized molding coefficient is compared with the preset pressurized molding coefficient threshold. If the pressurized molding coefficient is not within the pressurized molding coefficient threshold, the pressurizing mechanism 7 and the temperature control mechanism 8 are started to adjust the temperature drop rate information and the pressure information until the pressurized molding coefficient is within the pressurized molding coefficient threshold.

[0074] S5, importing the pressurized molding coefficient and the cavity condition coefficient within the pressurized molding coefficient threshold into the molding evaluation model to obtain a molding evaluation index, and comparing the obtained molding evaluation index with a preset index threshold. If the molding evaluation index is not within the index threshold, the pressurized molding coefficient is adjusted under the condition that the pressurized molding coefficient is within the pressurized molding coefficient threshold, so that the molding evaluation index is within the index threshold until the casting is formed;

[0075] Wherein, the expression of the cavity condition model is:

[0076] ;

[0077] in, represents the cavity condition coefficient, Represents displacement information, Indicates the pressure information. represents the displacement influence factor, represents the impact factor of the pressure, , , ;

[0078] Wherein, the expression of the pressurized forming model is:

[0079] ;

[0080] in, is the compression molding coefficient, represents the molding cavity volume, Indicates pressure information, Indicates the temperature drop rate information. Represents the average of the upper and lower limits of the pressure threshold, It represents the average of the upper and lower limits of the temperature drop rate threshold. Indicates the factors affecting molding quality, Indicates the lower limit of the pressure threshold, Indicates the lower limit of the temperature drop rate threshold;

[0081] Among them, the expression of the molding evaluation model is:

[0082] ;

[0083] in, represents the molding evaluation index, represents the cavity condition coefficient, Indicates the compression molding coefficient, Represents the influencing factor of cavity condition coefficient, Indicates the influencing factor of the press forming coefficient, , .

[0084] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0085] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for pressurizing a riser using a riser pressurizing device, the riser pressurizing device comprising a support frame (1), a side plate (2) and a top plate (3), wherein two ends of the side plate (2) are fixedly connected to the support frame (1) and the top plate (3) respectively, and characterized in that: Also includes: An upper mold (5) is connected to a pushing mechanism (6) mounted on the top plate (3); A lower mold (4) is mounted on the carrier frame (1) and forms a molding cavity with the upper mold (5); A pushing mechanism (6) is mounted on the top plate (3) and is used to push the upper mold (5) to perform linear motion; A pressurizing mechanism (7) is mounted on the upper mold (5) and is used to perform a pressurizing treatment on the molding cavity; A temperature control mechanism (8) is mounted on the carrier frame (1) and is used to cool the lower mold (4) and the upper mold (5); A detection mechanism, used to detect the displacement distance of the upper mold (5), the pressure between the lower mold (4) and the upper mold (5), the pressure in the molding cavity, and the temperature in the molding cavity; The temperature control mechanism (8) comprises an oil tank (801), a first pipe (802), a second pipe (803), a third pipe (804) and a pump body (805); the oil tank (801) is fixedly connected to the lower end of the support frame (1); one end of the first pipe (802) extends into the oil tank (801) and the other end passes through the lower mold (4); one end of the first pipe (802) passing through the lower mold (4) is plug-in-connected to the end of the second pipe (803) embedded in the upper mold (5); the third pipe (804) One end extends into the oil tank (801) and the other end passes through the lower mold (4); one end of the third pipe (804) passes through the lower mold (4) and is plug-in-connected to the other end of the second pipe (803) embedded in the upper mold (5); one end of the first pipe (802) extends into the oil tank (801) and is fixedly connected to the output end of a pump body (805) fixedly installed in the oil tank (801); a cooling device for cooling the oil in the oil tank (801) and a heating mechanism for heating the oil are provided in the oil tank (801); The pushing mechanism (6) comprises a first linear moving member (601), a first joint (603), a second joint (604) and a first pressure sensor (605); the first linear moving member (601) is detachably connected to the top plate (3); the first joint (603) is sleeved on the output shaft of the first linear moving member (601) and is fixedly connected to the first linear moving member (601); the second joint (604) is rotatably connected to the first pressure sensor (605) fixedly connected to the upper mold (5); and the second joint (604) is threadedly connected to the first joint (603); The pressurizing mechanism (7) comprises a plunger head (701), wherein the two plunger heads (701) are slidably connected to a gate (501) and a riser (502) provided on the upper mold (5), and further comprises: A pushing assembly (702) is mounted on the upper die (5) and is used to push the plunger head (701) to perform linear movement in a vertical direction; The pushing assembly (702) comprises a mounting plate (7021), a motor (7022), a bearing plate (7023) and a second linear moving member (7024); the mounting plate (7021) is fixedly connected to the upper mold (5); the motor (7022) is detachably connected to the mounting plate (7021); the bearing plate (7023) is fixedly connected to an output shaft of the motor (7022); the second linear moving member (7024) is detachably connected to the bearing plate (7023); and the output shaft of the second linear moving member (7024) is fixedly connected to the plunger head (701); The detection mechanism comprises a first pressure sensor (605) for detecting the pressure between the upper die (5) and the lower die (4), and further comprises: A displacement sensor, mounted on the upper die (5), for detecting the displacement distance of the upper die (5); A temperature sensor is installed at the bottom of the lower mold (4) and is used to detect the temperature in the molding cavity to obtain the temperature drop rate of the casting; A pressure sensor, embedded and installed at the bottom end of the plunger head (701), for detecting the pressure in the molding cavity; The method for pressurizing the riser by the riser pressurizing device comprises the following steps: S1. Using the first linear motion member (601) to push the first joint (603) to drive the second joint (604) to perform linear motion in the vertical direction, the second joint (604) to push the first pressure sensor (605) to drive the upper mold (5) to perform linear motion in the vertical direction, so that the upper mold (5) presses against the lower mold (4) and the first pipe (802) and the third pipe (804) are correspondingly inserted into the two ends of the second pipe (803) so that the lower mold (4) and the upper mold (5) fit together to form a molding cavity; S2, using a displacement sensor to obtain displacement information of the upper mold (5), and using a first pressure sensor (605) to obtain the pressing pressure information between the lower mold (4) and the upper mold (5). When the displacement information and the pressing pressure information are within the corresponding displacement threshold and pressing pressure threshold, it indicates that the upper mold (5) has initially reached the preset position. At this time, the upper mold (5) is continuously pushed and the obtained displacement information and pressing pressure information are imported into the cavity condition model after dimensionless processing to obtain the cavity condition coefficient. If the obtained cavity condition coefficient is within the cavity condition coefficient threshold, it indicates that the upper mold (5) has reached the specified position. If the cavity condition coefficient is not within the cavity condition coefficient threshold, the first linear motion member (601) is continuously started to push the upper mold (5) to press against the lower mold (4) until the cavity condition coefficient is within the cavity condition coefficient threshold. S3, introducing the casting liquid from the riser (502) into the molding cavity, and after the introduction is completed, starting the motor (7022) to drive the bearing plate (7023) to push the plunger head (701) to rotate in the horizontal direction, so that the two plunger heads (701) are respectively located above the gate (501) and the riser (502), and at this time, starting the two second linear motion members (7024) to correspondingly push the two plunger heads (701) connected thereto to perform linear motion in the vertical direction, so that the two plunger heads (701) are correspondingly inserted into the gate (50 1) and the riser (502), pressurizing the casting liquid in the molding cavity, and starting the pump body (805) to guide the oil cooled / heated by the cooling device / heating device into the first pipe (802) and into the third pipe (804) through the second pipe (803), and finally into the oil tank (801) through the third pipe (804), and perform temperature control on the lower mold (4) and the upper mold (5), so as to keep the temperature drop rate of the casting in the molding cavity within the temperature drop rate threshold until the casting reaches room temperature; S4, using a temperature sensor to obtain the temperature drop rate of the casting, using a pressure sensor to obtain the pressure information in the molding cavity, and comparing the two with the preset temperature drop rate threshold and the pressure threshold. If the temperature drop rate is not within the corresponding threshold, the temperature control mechanism (8) is started to control the temperature drop rate. If the pressure information is not within the pressure threshold, the second linear motion member (7024) is started to push the plunger head (701) to change the pressure information so that the pressure information is within the pressure threshold. When the temperature drop rate information and the pressure information are both within the corresponding temperature drop rate threshold and the pressure threshold, the temperature drop rate information and the pressure information are dimensionlessly processed and introduced into the pressurized molding model to derive the pressurized molding coefficient. The obtained pressurized molding coefficient is compared with the preset pressurized molding coefficient threshold. If the pressurized molding coefficient is not within the pressurized molding coefficient threshold, the pressurizing mechanism (7) and the temperature control mechanism (8) are started to adjust the temperature drop rate information and the pressure information until the pressurized molding coefficient is within the pressurized molding coefficient threshold. S5. Import the pressurized molding coefficient and the cavity condition coefficient within the pressurized molding coefficient threshold into the molding evaluation model to obtain the molding evaluation index, and compare the obtained molding evaluation index with the preset index threshold. If the molding evaluation index is not within the index threshold, then under the condition that the pressurized molding coefficient is within the pressurized molding coefficient threshold, adjust the pressurized molding coefficient to bring the molding evaluation index within the index threshold until the casting is formed.

2. The method for pressurizing a riser by a riser pressurizing device according to claim 1, characterized in that: A stabilizing plate (602) is rotatably connected to the output shaft of the first linear motion member (601), and the stabilizing plate (602) is slidably engaged with a limiting sliding groove provided on the side plate (2).

3. The method for pressurizing a riser by a riser pressurizing device according to claim 1, characterized in that: The expression of the cavity condition model is: ； represents the cavity condition coefficient, Represents displacement information, Indicates the pressure information. represents the displacement influence factor, represents the impact factor of the pressure, , , .

4. The method for pressurizing a riser by a riser pressurizing device according to claim 1, characterized in that: The expression of the pressure forming model is: ； in, is the compression molding coefficient, represents the molding cavity volume, Indicates pressure information, Indicates the temperature drop rate information. Represents the average of the upper and lower limits of the pressure threshold, It represents the average of the upper and lower limits of the temperature drop rate threshold. Indicates the factors affecting molding quality, Indicates the lower limit of the pressure threshold, Indicates the lower limit of the temperature drop rate threshold.

5. The method for pressurizing a riser by a riser pressurizing device according to claim 1, characterized in that: The expression of the molding evaluation model is: ； in, represents the molding evaluation index, represents the cavity condition coefficient, Indicates the compression molding coefficient, Represents the influencing factor of cavity condition coefficient, Indicates the influencing factor of the press forming coefficient, , .

Images