A method for correcting the shape of a non-regular-section thin-wall casting by top pressing and a tool for top pressing

Abstract

The present application relates to a kind of non-regular section thin-walled casting top pressure type correction method and top pressure type correction tool, belong to thin-walled casting type correction technical field, solve the technical problem that the force, correction amount and general property of existing top pressure type correction device correction are not strong.The method includes: based on the absolute deformation of different deformation positions of casting, determine multiple top pressure type correction positions;Top pressure type correction device is set at all top pressure type correction positions, implement internal and external corresponding top pressure fixed;The absolute deformation of multiple top pressure type correction positions is obtained, and whether the absolute deformation of top pressure type correction position meets the casting profile requirement is judged;With the top pressure type correction point of not meeting the casting profile requirement, top pressure type correction point is top pressure type corrected using top pressure type correction device.It is realized that the accurate multi-point type correction clamping is accurately grasped, and the size of force point and correction amount can be accurately grasped, and it is easy to use.

Description

Technical Field

[0001] The invention relates to the technical field of thin-wall casting profiling, in particular to a top-pressing profiling method for thin-wall castings with irregular cross-sections and a tool for the top-pressing profiling. Background Art

[0002] At present, there are two methods for shaping irregular thin-walled castings with cavities. One is to use a hammer to manually shape them, which is time-consuming, labor-intensive and inefficient. The other is to use a top press to shape them. Existing top presses generally use hydraulic devices or gear transmission mechanisms to achieve shape correction. This type of top press has a complex structure. The hydraulic device or gear transmission device is used as a driving device, which inevitably requires corresponding pipelines or motors, making the top press as a whole relatively bulky. For the need to shape from the inside out, the existing technology is difficult to operate, and during the shaping process, it is easy to cause the non-deformed parts of the casting to twist and deform, resulting in low efficiency. Summary of the Invention

[0003] In view of the above analysis, the embodiments of the present invention aim to provide a method for top pressure shaping of thin-walled castings with irregular cross-sections and a tool for top pressure shaping, so as to solve the problems that the existing top pressure shaping devices have weak shaping force, shaping amount and versatility, are difficult to operate for the need of shaping from the inside to the outside, and are difficult to control the deformation of the shaping.

[0004] In one aspect, an embodiment of the present invention provides a method for top pressing and shaping thin-walled castings with irregular cross-sections, comprising:

[0005] Step 1: Based on the absolute deformation of different deformation parts of the casting, determine multiple top pressure correction parts;

[0006] Step 2: Install top pressure correction devices at all top pressure correction locations to implement corresponding top pressure fixation inside and outside;

[0007] Step 3: Obtain the absolute deformation of multiple top-pressing and shaping parts, and determine whether the absolute deformation of the top-pressing and shaping parts meets the casting profile requirements;

[0008] Step 4: Take the top pressure correction part that does not meet the casting contour requirement as the top pressure correction point, and use the top pressure correction device to perform top pressure correction on the top pressure correction point.

[0009] Based on the further improvement of the above method, the step 1 includes:

[0010] S101: Obtaining the absolute deformation of different deformation parts of the casting;

[0011] S102: Taking the deformed part with the maximum deformation as the base point, taking the reinforcing rib closest to the base point as the origin;

[0012] S103: Arrange the top pressing and shaping parts based on the origin position to obtain multiple top pressing and shaping parts.

[0013] Based on a further improvement of the above method, in step S103, the top pressing and shaping parts are arranged in such a manner that the distance between adjacent top pressing and shaping parts is no more than 1 / 8 of the perimeter of the cross section and the distance between adjacent contour surfaces is no more than 200 mm.

[0014] Based on the further improvement of the above method, the step 4 includes:

[0015] S401: Setting the heating temperature of the driving member of the top pressing and shaping device according to the deformation data at the top pressing and shaping point;

[0016] S402: Power is supplied to the driving component through the power supply assembly of the top pressure shaping device, causing the driving component to deform and drive the cast iron top pressure head to act on the surface of the part to be shaped. The temperature of the driving component is detected by the rear-end temperature measuring thermocouple of the top pressure shaping device.

[0017] S403: After the temperature of the driving component reaches the set heating temperature, the temperature is kept warm, and the current is cut off after the temperature is kept warm.

[0018] S404: performing high-frequency vibration treatment on the top pressure correction point to eliminate stress at the top pressure correction point;

[0019] S405: Re-inspect the casting after correction until the deformation of the casting meets the contour requirements.

[0020] Based on a further improvement of the above method, step S401 includes:

[0021] S4011: Determine a single maximum deformation excess value s at the top pressure correction point based on the absolute deformation ε at the top pressure correction point and the main body wall thickness t at the top pressure correction point;

[0022] S4012: Based on ε and s, the feed amount M of the cast iron ram is obtained, and then the deformation amount L of the driving member is determined;

[0023] S4013: Based on L, obtain the heating temperature T of the driving component.

[0024] Based on a further improvement of the above method, in step S4012, the feed amount M of the cast iron ram is the same as the deformation amount L of the driving member, and M satisfies:

[0025] M=ε+s.

[0026] Based on a further improvement of the above method, in step S4013, based on the corresponding relationship between the deformation L of the driver and the temperature T, a linear regression equation corresponding to the deformation L and the temperature T of the driver is obtained;

[0027] Among them, y is the dependent variable, corresponding to the deformation L of the driving part, and x is the independent variable, corresponding to the temperature T of the driving part.

[0028] Based on the further improvement of the above method, the linear regression equation is:

[0029] y=0.8027*x-37.156.

[0030] On the one hand, an embodiment of the present invention provides a tool for top pressure shaping of irregular cross-section thin-walled castings, which is used to implement the above-mentioned top pressure shaping method. The tool includes a top pressure shaping device, a rear-end drive device, and a high-frequency vibration device for eliminating stress in the local shaping part of the casting;

[0031] The top pressure shaping device includes a driving member, a transmission member, a cast iron top pressure head, a support frame, a heat source and a mounting frame, wherein the heat source, the driving member, the transmission member and the cast iron top pressure head are integrated on the support frame;

[0032] The rear end driving device is connected to the support frame and the mounting frame respectively, and is used to adjust the position of the support frame on the mounting frame;

[0033] Wherein, the casting is fixed on the mounting frame.

[0034] Based on the further improvement of the above-mentioned top pressing and shaping tooling, the deformation state of the driving member is different at different temperatures;

[0035] The heat source controls the driving member to deform and extrude the transmission member, and the transmission member drives the cast iron top pressure head to extrude and correct the casting surface.

[0036] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0037] 1. The present invention determines the origin based on the absolute deformation of all deformed parts of the casting, and arranges the top pressure correction parts based on the origin, implements corresponding internal and external top pressure fixation on the multiple top pressure correction parts obtained, obtains the top pressure correction points from the obtained top pressure correction parts, and corrects the top pressure correction points. In this way, through precise multi-point correction clamping, the displacement of the casting during the top pressure correction process is effectively prevented, and the casting is prevented from being twisted, deformed or cracked.

[0038] 2. The correction amount of the deformed part can be controlled by temperature. After each round of correction, there is no need to dismantle the internal correction tooling to scan the casting and formulate a secondary correction plan. For the deep inner cavity of the casting, it is easy to accurately grasp the size of the force application point and the correction amount, and it is easy to use.

[0039] 3. By adjusting the position of the support frame through the rear-end drive device, the cast iron ram can be conveniently adjusted to the surface of the casting to be corrected. Then, the heat source is used to control the drive member to change its own shape to squeeze the transmission member, and the cast iron ram is driven to move through the transmission member to achieve the correction of the casting. The structure is simple and there is no need to set up a complex mechanical force transmission mechanism, making the ram correction device small and lightweight.

[0040] 4. By controlling the temperature parameters of the driving parts and the deformation of the driving parts, the single correction amount can be controlled to adapt to different deformation parts. In addition, the size of the cast iron top pressure head can be adjusted to adapt to the size of the deformation part, thereby achieving accurate control of the size of the force application point and the correction amount, and improving the versatility of the device.

[0041] 5. The deformation correction range is 0.1-8mm, and the one-time correction accuracy can reach 0.1mm / 40mm. The overall casting deformation correction qualification rate is increased by 5 times, from 26-30 hours / piece to 4-6 hours / piece, which significantly improves the correction accuracy and efficiency.

[0042] 6. By using multiple vertical support frames and height-fixing rings to synchronously adjust multiple cast iron rams, all deformed parts of the casting can be synchronously corrected, which improves the correction efficiency. In addition, a cast iron ram is set at the same deformation part of the inner and outer cavities of the casting to perform positive and negative force correction to avoid distortion near the area to be corrected.

[0043] 7. Irregular thin-walled castings are placed in high-rigidity cast iron top pressure shaping fixtures, which have good overall stability and overcome the problem of random deformation of other parts of the castings during manual mechanical shaping.

[0044] In the present invention, the above-mentioned technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of the present invention will be described in the following description, and some advantages will become apparent from the description or be learned through practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the contents particularly pointed out in the description and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The accompanying drawings are only for the purpose of illustrating particular embodiments and are not to be considered limiting of the present invention. Like reference symbols denote like parts throughout the drawings.

[0046] Figure 1 This is a schematic structural diagram of the thin-walled casting top pressure correction device of the present invention;

[0047] Figure 2 This is a schematic structural diagram of the present invention using a mounting frame to support a thin-walled casting shaping device for processing the casting;

[0048] Figure 3 for Figure 2 A schematic diagram of the structure enlargement at point A;

[0049] Figure 4 Schematic diagram of the linear relationship between the deformation and temperature of the driving member in the present invention;

[0050] Figure 5 It is a structural schematic diagram of two thin-walled casting top pressure correction devices in the present invention when they are at the same deformation position of the inner and outer cavities of the castings;

[0051] Figure 6 This is a schematic diagram of the structure of the rear-end drive device and the support frame in the present invention;

[0052] Figure 7 This is a flow chart of the top-pressing shaping method for irregular cross-section thin-walled castings of the present invention;

[0053] Figure 8 Schematic diagram of the cross-sectional structure of the casting in the present invention;

[0054] Figure 9 It is a schematic diagram of the direction adjustment support seat structure in the present invention.

[0055] Reference numerals:

[0056] 1-driving part; 2-transmission part; 3-cast iron top pressure head; 4-support frame; 5-plane load-bearing bearing; 6-front-end limit switch; 7-positive and negative poles of the power supply component; 8-rear-end temperature measuring thermocouple; 9-casting; 10-mounting frame; 1001-vertical support rod; 1002-height fixing ring; 1003 casting support beam; 11-direction adjustment support seat; 1101-driving gear; 1102-transmission gear; 1103 driven gear; 12-double-column hydraulic arm; 13-worm gear. DETAILED DESCRIPTION

[0057] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, and are not used to limit the scope of the present invention.

[0058] A casting used in aviation products has a thin-walled cavity. Before assembly and application, the casting needs to be calibrated to meet usage requirements.

[0059] Because the casting has thin walls, large volume, and irregular surfaces, it is difficult to clamp and fix the casting. The top press has a complex and bulky structure and is inconvenient to install. Moreover, for thin-walled parts, the existing top press may affect the surface near the deformed part during the correction process, resulting in the casting surface accuracy failing to meet the requirements.

[0060] As can be seen, traditional mechanical shaping methods lack strength, shaping capacity, and versatility. For shaping from the inside out, existing technology is difficult to operate, and it is even more difficult to control the deformation of the shaping process. Therefore, shaping is generally not done with a top press, but rather by manual hammering.

[0061] However, the size of the force point and the amount of shaping cannot be accurately controlled by manual hammering and shaping. Moreover, for deep parts of the casting cavity, such as the top of the casting cavity, manual hammering and shaping is laborious and time-consuming, resulting in low shaping efficiency.

[0062] To solve the above problems, the present invention provides a method for top pressing and shaping thin-walled castings with irregular cross-sections, comprising:

[0063] Step 1: Based on the absolute deformation of different deformation parts of the casting, determine multiple top pressure correction parts;

[0064] Step 2: Install top pressure correction devices at all top pressure correction locations to implement corresponding top pressure fixation inside and outside;

[0065] Step 3: Obtain the absolute deformation of multiple top-pressing and shaping parts, and determine whether the absolute deformation of the top-pressing and shaping parts meets the casting profile requirements;

[0066] Step 4: Take the top pressure correction part that does not meet the casting contour requirement as the top pressure correction point, and use the top pressure correction device to perform top pressure correction on the top pressure correction point.

[0067] Compared with the prior art, the present invention determines the origin based on the absolute deformation of all deformed parts of the casting, and arranges the top pressure correction parts based on the origin, implements corresponding internal and external top pressure fixation on the multiple top pressure correction parts obtained, obtains the top pressure correction points from the obtained top pressure correction parts, and corrects the top pressure correction points. In this way, through precise multi-point correction clamping, the displacement of the casting 9 during the top pressure correction process is effectively prevented, and the casting 9 is prevented from being twisted, deformed or cracked.

[0068] Specifically, step 1 includes:

[0069] S101: Obtaining the absolute deformation of different parts of the casting 9 to be corrected;

[0070] S102: Taking the part to be shaped with the maximum deformation as the base point, the reinforcement point closest to the base point in a straight line is taken as the origin;

[0071] S103: Arrange the top pressing and shaping parts based on the origin position to obtain multiple top pressing and shaping parts.

[0072] Among them, the top pressure correction parts are arranged in accordance with the principle that the distance between adjacent top pressure correction parts is not greater than 1 / 8 of the cross-sectional perimeter and the distance between adjacent contour surfaces is not greater than 200mm.

[0073] Specifically, in step 2, a top-pressing and shaping device of a top-pressing and shaping tool is used to implement corresponding internal and external top-pressing and fixing at all top-pressing and shaping locations.

[0074] Among them, the tooling for top pressure correction includes a top pressure correction device and a rear end drive device.

[0075] Among them, the rear end driving device is used to adjust the position of the top pressure correction device to achieve internal and external corresponding top pressure fixation at all top pressure correction parts.

[0076] Specifically, in step 3, the contour requirement is determined based on the processing technology requirement. For example, an absolute deformation within the range of 0.5 mm meets the contour requirement.

[0077] Specifically, step 4 includes:

[0078] S401: Setting the heating temperature of the driving member 1 of the top pressing and shaping device according to the deformation data at the top pressing and shaping point;

[0079] S402: Power is supplied to the driving member 1 through the power supply assembly of the top pressure shaping device, causing the driving member 1 to deform and drive the cast iron top pressure head 3 to act on the surface of the casting to be shaped. The temperature of the driving member is detected by the temperature measuring thermocouple 8 at the rear end of the top pressure shaping device.

[0080] S403: After the temperature of the driving element 1 reaches the set heating temperature, the temperature is kept warm, and the current is cut off after the temperature is kept warm.

[0081] S404: performing high-frequency vibration treatment on the top pressure correction point to eliminate stress at the top pressure correction point;

[0082] S405: Re-inspect the calibrated casting 9 until the deformation of the casting meets the contour requirement.

[0083] Among them, the top pressure correction tool also includes a high-frequency vibration device, which uses the high-frequency vibration device to perform high-frequency vibration treatment on the top pressure correction point.

[0084] Among them, the top pressure correction device includes: the top pressure correction device includes a driving part 1, a transmission part 2, a cast iron top pressure head 3, a support frame 4, a heat source and a mounting frame 10, and the driving part 1, the transmission part 2, the cast iron top pressure head 3 and the heat source are integrated on the support frame 4.

[0085] The rear end driving device is connected to the support frame 4 and the mounting frame 10 respectively, so as to adjust the position of the support frame 4 on the mounting frame 10 .

[0086] The casting 9 is fixed on the mounting frame 10 , and the high-frequency vibration device is used to perform high-frequency vibration treatment on the top pressure correction point of the casting 9 .

[0087] The deformation state of the driving member 1 is different at different temperatures. The heat source controls the deformation of the driving member 1 to extrude the transmission member, and the transmission member 1 drives the cast iron ram 3 to extrude and correct the casting surface.

[0088] Specifically, in S401, it includes:

[0089] S4011: Determine a single maximum deformation excess value s at the top pressure correction point based on the absolute deformation ε at the top pressure correction point and the main body wall thickness t at the top pressure correction point;

[0090] S4012: Based on ε and s, the feed amount M of the cast iron ram 3 is obtained, and then the deformation amount L of the driving member 1 is determined;

[0091] The feed rate M of the cast iron ram 3 is the same as the deformation rate L of the driving member 1, and M satisfies:

[0092] M=ε+s Formula (1)

[0093] S4013: Based on L, obtain the heating temperature T of the driving member 1.

[0094] Based on the corresponding relationship between the deformation L and the temperature T of the drive, a linear regression equation corresponding to the deformation L and the temperature T of the drive member 1 is obtained; the linear regression equation is:

[0095] y=0.8027*x-37.156 Formula (2)

[0096] Among them, y is the dependent variable, corresponding to the deformation L of the driving member 1, and x is the independent variable, corresponding to the temperature T of the driving member 1. The linear relationship between L and T is shown in the attached Figure 4 .

[0097] Specifically, in S403, when the temperature of the driving component 1 reaches the set heating temperature, the heat preservation continues for 5-10 seconds.

[0098] In order to realize the above-mentioned top pressure shaping method, the present invention also provides a tool for top pressure shaping of irregular cross-section thin-walled castings, including a top pressure shaping device, a rear end drive device and a high-frequency vibration device for eliminating stress in the local shaping part of the casting.

[0099] The top pressure shaping device includes: the top pressure shaping device includes a driving part 1, a transmission part 2, a cast iron top pressure head 3, a support frame 4, a heat source and a mounting frame 10, such as Figure 1 As shown, the driving member 1 , the transmission member 2 , the cast iron ram 3 and the heat source are integrated on the support frame 4 .

[0100] The rear end driving device is connected to the support frame 4 and the mounting frame 10 respectively, so as to adjust the position of the support frame 4 on the mounting frame 10 .

[0101] The casting 9 is fixed on the mounting frame 10 , and the high-frequency vibration device is used to perform high-frequency vibration treatment on the top pressure correction point of the casting 9 .

[0102] The heat source controls the driving member 1 to deform and extrude the transmission member, and the transmission member 1 drives the cast iron ram 3 to extrude and correct the casting surface.

[0103] Among them, at different temperatures, the morphological state of the driving member 1 is different. When heated, the driving member 1 is in an expanded state to squeeze the transmission member 2, and then the transmission member 2 drives the cast iron ram 3 to move, and finally realizes the correction of the casting.

[0104] Furthermore, the driver 1 is a conductor, and the heat source includes a power supply component that transmits current to the interior of the driver 1. In this way, current flows inside the driver 1, and electrical energy is converted into internal energy, which changes the internal temperature of the driver 1 and thus changes the shape of the driver 1.

[0105] In one possible embodiment, the material of the driving component 1 is Ni / Ti two-way memory alloy. After the current is passed, the electrical energy is converted into internal energy, the temperature rises, and the Ni / Ti two-way memory alloy undergoes martensitic transformation, causing the driving component 1 to deform. After the temperature drops, the driving component 1 can return to its original state.

[0106] Specifically, the shape of the driving member 1 is spiral. After the current is passed through, the Ni / Ti bidirectional memory alloy undergoes martensitic transformation, and the spiral will straighten to provide ejection force. After the temperature drops, it returns to the spiral shape. In this way, in the moving direction of the cast iron top pressure head 3, the driving member with a spiral structure can provide a larger deformation amount to adapt to the casting surface with different deformations.

[0107] Among them, the two ends of the driving part 1 are respectively connected to the positive and negative poles 7 of the power supply component. Based on the thermal effect of the current, the temperature of the driving part will become higher and higher during the power-on time. At this time, as the temperature increases, the spiral deformation continues to extend. The deformation stops when the heat is kept warm. When the power is cut off, the spiral Ni / Ti bidirectional memory alloy cools down, rebounds and shrinks.

[0108] Furthermore, a rear-end temperature measuring thermocouple 8 is provided on the support frame 4 for measuring the temperature of the driving part 1. Exemplarily, the rear-end temperature measuring thermocouple 8 is a point contact thermocouple, so as to set the heating temperature of the spiral Ni / Ti bidirectional memory alloy according to the deformation data of the top pressure part of the casting to control the correction amount.

[0109] Furthermore, a front limit switch 6 is provided on the cast iron top pressure head 3. The front limit switch 6 is a signal triggering device. When the cast iron top pressure head 3 contacts the casting surface, the front limit switch 6 is triggered to determine the position of the cast iron top pressure head 3.

[0110] The size and position of the force application point are determined according to the effective area of ​​the casting to be shaped, and based on this, the size of the cast iron ram 3 is designed.

[0111] Specifically, one end of the transmission member 2 is connected to the cast iron ram 3, and the other end thereof is connected to one end of the driving member 1, so as to transmit the ejection force generated by the deformation of the driving member 1 to the cast iron ram 3, so that the cast iron ram 3 moves relative to the support frame 4.

[0112] The other end of the driving member 1 is fixedly mounted on the support frame 4 so that when the driving member 1 is deformed, the ejection force generated by the deformation is transmitted toward the transmission member 3 .

[0113] Specifically, such as Figure 6 As shown, the rear end driving device includes a direction adjustment support seat 11, a double-column hydraulic arm 12 and a worm gear 13.

[0114] Among them, one end of the direction adjustment support seat 11 is connected to the mounting frame 10, and the other end is fixedly connected to the double-column hydraulic arm 12. The direction adjustment support seat 11 can be a mechanical arm or a gear transmission structure, which can adjust the tilt direction of the double-column hydraulic arm 12.

[0115] Exemplarily, the direction adjustment support seat 11 may include a driving gear 1101, a transmission gear 1102 and a driven gear 1103; wherein, the driving gear 1101 is meshed and connected with the two transmission gears 1102, and the two transmission gears 1102 are meshed and connected with the driven gear 1103; the driving gear 1101 drives the driven gear 1103 to rotate through the two transmission gears 1102 to adjust the tilt direction of the double-column hydraulic arm 12.

[0116] Among them, one end of the double-column hydraulic arm 12 is fixedly connected to the middle part of the tooth surface of the driven gear 1103, and the other end is fixedly connected to the worm gear 13. The double-column hydraulic arm 12 is a first-stage transmission device, including two hydraulic arms that can be extended and retracted synchronously, so that the position of the worm gear 13 can be adjusted in the extension and retraction direction of the hydraulic arm.

[0117] Among them, one end of the worm gear 13 is fixedly connected to the double-column hydraulic arm 12, and the other end is connected to the support frame 4. The worm gear 13 is a two-stage transmission device. When it is in action, the cast iron top pressure head 3 at the front end of the support frame 4 is slightly moved toward the surface of the casting through the extension and contraction of the worm gear 13 until the front end limit switch 6 signal at the cast iron top pressure head 3 is triggered, and the worm gear 13 stops moving.

[0118] The telescopic direction of the worm gear 13 is consistent with the telescopic direction of the double-column hydraulic arm 12 .

[0119] Specifically, the mounting frame 10 includes a vertical support rod 1001 , a height fixing ring 1002 and a casting support beam 1003 .

[0120] The direction adjustment support seat 11 is installed on the height fixing ring 1002 , and the height fixing ring 1002 is installed on the vertical support rod 1001 .

[0121] Among them, the height position of the height fixing ring 1002 on the vertical support rod 1001 is adjustable, and the height fixing ring 1002 can also be fixed on the vertical support rod 1001 after being rotated. In this way, by adjusting the position of the height fixing ring 1002 on the vertical support rod 1001, the position of the direction adjustment support seat 11 can be adjusted, and then the position of the cast iron top pressure head 3 can be adjusted.

[0122] The height fixing ring 1002 can slide on the vertical support rod 1001 , and the height fixing ring 1002 is fixedly connected to the vertical support rod 1001 by tightening bolts.

[0123] Among them, there are multiple vertical support rods 1001. For example, there are 5 vertical support rods 1001, 4 vertical support rods 1001 are distributed on the outside of the casting, and 1 vertical support rod 1001 is distributed in the inner cavity of the casting. Multiple height-fixed rings 1002 can be installed to achieve synchronous correction of all deformed parts.

[0124] Among them, there are at least two casting support beams 1003, wherein the two casting support beams 1003 are distributed up and down. During the shape adjustment, the casting is located between the two casting support beams 1003, and the upper and lower ends of the casting are fixed by the two casting support beams 1003.

[0125] The upper and lower ends of the vertical support rod 1001 are respectively connected to the casting support beam 1003 , and the vertical support rod 1001 and the casting support beam 1003 can be fastened together by connecting bolts.

[0126] Wherein, the high-frequency vibration device is a spring high-frequency vibration device.

[0127] Compared with the prior art, the present invention determines the origin based on the absolute deformation of all deformed parts of the casting, and arranges the top pressure correction parts based on the origin, implements corresponding internal and external top pressure fixation on the multiple top pressure correction parts obtained, obtains the top pressure correction points from the obtained top pressure correction parts, and corrects the top pressure correction points. In this way, through precise multi-point correction clamping, the displacement of the casting 9 during the top pressure correction process is effectively prevented, and the casting 9 is prevented from being twisted, deformed or cracked.

[0128] The amount of correction of the deformed parts can be controlled by temperature. After each round of correction, there is no need to dismantle the internal correction tooling to scan the casting and formulate a secondary correction plan. For the deep inner cavity of the casting, it is convenient to accurately grasp the size of the force application point and the amount of correction, and it is easy to use.

[0129] By adjusting the position of the support frame 4 through the rear-end driving device, the cast iron top pressure head 3 can be conveniently adjusted to the surface of the casting to be corrected, and then the driving part 1 is controlled by the heat source to change its own shape to squeeze the transmission part 2, and the cast iron top pressure head 3 is driven to move by the transmission part 2, thereby realizing the correction of the casting. The structure is simple and there is no need to set up a complex mechanical force transmission mechanism, making the top pressure correction device small and lightweight.

[0130] By controlling the temperature parameters of the driving parts and controlling the deformation amount of the driving parts, it is possible to control the single shaping amount and adapt to different deformation parts. In addition, the size of the cast iron top pressure head 3 can be adjusted to adapt to the size of the deformation part, thereby achieving accurate control of the size of the force application point and the shaping amount, and improving the versatility of the shaping device.

[0131] The deformation correction range is 0.1-8mm, and the correction accuracy can reach 0.1mm / 40mm in one time. The overall casting deformation correction qualification rate is increased by 5 times, from 26-30 hours / piece to 4-6 hours / piece, which significantly improves the correction accuracy and efficiency.

[0132] By using multiple vertical support frames 1001 and height-fixed rings 1002, multiple cast iron rams 3 are adjusted synchronously, which can achieve synchronous correction of all deformed parts of the casting, thereby improving the correction efficiency. In addition, a cast iron ram 3 is respectively set at the same deformation part of the inner and outer cavities of the casting to perform positive and negative force correction, thereby avoiding distortion and deformation near the area to be corrected of the casting.

[0133] The irregular thin-walled casting is placed in a high-rigidity cast iron top-pressure shaping fixture, which has good overall stability and overcomes the problem of random deformation of other parts of the casting during manual mechanical shaping.

[0134] Example 1

[0135] A method for top pressing and shaping thin-walled castings with irregular cross-sections, comprising:

[0136] Step 1: Based on the absolute deformation of different deformation parts of the casting, determine multiple top pressure correction parts;

[0137] Specifically, they include:

[0138] S101: Obtaining the absolute deformation amounts of different deformation locations of the casting 9;

[0139] Specifically, they include:

[0140] S1011: Scan the casting 9 to obtain a three-dimensional model of the casting;

[0141] Among them, the casting that is to be aging treated after quenching is placed on a platform, and a 3D scanner is used to scan the inner and outer contours of the casting as a whole to obtain a 3D model of the casting.

[0142] S1012: Based on the drawing processing benchmark, the theoretical model of the casting and the 3D model obtained by scanning are aligned and assembled to obtain the absolute deformation of different deformation parts of the casting.

[0143] S102: Taking the deformed part with the maximum deformation as the base point, taking the reinforcing rib closest to the base point as the origin;

[0144] S103: Arrange the top pressing and shaping parts based on the origin position to obtain multiple top pressing and shaping parts.

[0145] Specifically, such as Figure 8 As shown, the top pressure correction points are arranged in such a way that the distance between adjacent top pressure correction parts is no more than 1 / 8 of the cross-sectional perimeter and the distance between adjacent contour surfaces is no more than 200 mm.

[0146] Among them, the distance between adjacent top pressure shaping parts should not be too large, so as to avoid driving the recovery of nearby deformed areas and increasing the possibility of shaping rupture; it should not be too small, which will make the shaping tooling arrangement troublesome and increase the difficulty of data control.

[0147] The distance between adjacent contour surfaces should not be too large, which may cause distortion; nor should it be too small, which may increase the workload of scanning and analyzing data after calibration.

[0148] Step 2: Install top pressure correction devices at all top pressure correction locations to implement corresponding top pressure fixation inside and outside;

[0149] The rear end driving device is used to adjust the position of the support frame 4 so that the pressing surface of the cast iron ram 3 abuts against the molding surface at the ram profiling portion.

[0150] Specifically, they include:

[0151] S201: Determine the number and installation positions of the vertical support frames 1001 and the height fixing rings 1002;

[0152] Among them, according to the distribution of the top pressure correction parts and the casting size data, the number and installation positions of the vertical support frames 1001 and the height fixing rings 1002 are adjusted to achieve synchronous correction of all deformed parts.

[0153] S202: Using the casting support beam 1003 to fix and clamp the upper and lower ends of the casting;

[0154] The casting may be fixed and clamped by squeezing the casting with two casting support beams 1003 .

[0155] S203: adjusting the position of the cast iron ram 3 based on the determined position of the ram profiling portion;

[0156] Specifically, after adjusting the height fixing ring 1102 to the corresponding position, the direction adjustment support seat 11 is installed on the height fixing ring 1002, and then the position of the cast iron top pressure head 3 is adjusted by the rear-end drive device to achieve a cast iron top pressure head 3 at the same deformation position of the inner and outer cavities of the casting, respectively, to perform positive and negative force pressing and fixing.

[0157] The method for adjusting the position of the cast iron ram 3 by the rear end drive device is as follows:

[0158] S2031: Adjust the tail direction adjustment support seat 11 so that the pressing surface of the cast iron ram 3 is parallel to the molding surface at the ram profiling portion;

[0159] The driving gear 1101 can be driven manually. When the driving gear 1101 is rotated clockwise, the transmission gear 1102 drives the driven gear 1103 to rotate clockwise; when the driving gear 1101 is rotated counterclockwise, the transmission gear 1102 drives the driven gear 1103 to rotate counterclockwise.

[0160] When the driving gear 1101 does not rotate, the driven gear 1103 remains fixed, and the tilt direction of the double-column hydraulic arm 12 is adjusted at this time, thereby adjusting the position of the top pressure surface of the cast iron top pressure head 3.

[0161] S2032: Start the double-column hydraulic arm 12 to move the pressing surface of the cast iron ram 3 toward the molding surface at the molding part;

[0162] The telescopic movement direction of the double-column hydraulic arm 12 is perpendicular to the pressing surface of the cast iron ram 3 .

[0163] Among them, when the front-end limit switch on the cast iron jacking head 3 contacts the molding surface at the jacking and shaping part, the double-column hydraulic arm stops extending forward.

[0164] S2033: Start the worm gear 13 and slightly move the pressing surface of the cast iron ram 3 toward the molding surface at the molding correction part until the front-end limit switch 6 on the cast iron ram 3 triggers the signal and the worm gear 13 stops moving.

[0165] Step 3: Obtain the absolute deformation of multiple top-pressing and shaping parts, and determine whether the absolute deformation of the top-pressing and shaping parts meets the casting profile requirements;

[0166] Specifically, they include:

[0167] S301: marking a top pressure correction part on the three-dimensional model of the casting, and obtaining an absolute deformation of the top pressure correction part;

[0168] Specifically, on the three-dimensional comparison view of the theoretical model of the casting and the three-dimensional model obtained by scanning, the corresponding top pressure correction points are marked, and the absolute deformation at the corresponding top pressure correction points is measured to obtain the absolute deformation at the corresponding points.

[0169] S302: Determine whether the deformation of the top pressing and shaping part meets the casting profile requirement;

[0170] Among them, the contour requirements are determined based on the processing technology requirements, and the absolute deformation greater than 0.5mm does not meet the contour requirements.

[0171] The contour requirements are determined based on the processing technology requirements, and the absolute deformation within the range of 0.5mm meets the contour requirements.

[0172] Among them, for the top pressure correction parts that meet the contour requirements, the top pressure correction device is used to implement corresponding internal and external top pressure fixation to avoid distortion of the parts.

[0173] Step 4: Take the top pressure correction part that does not meet the casting contour requirement as the top pressure correction point, and use the top pressure correction device to perform top pressure correction on the top pressure correction point.

[0174] Specifically, they include:

[0175] S401: Setting the heating temperature of the driving member 1 of the top pressing and shaping device according to the deformation data at the top pressing and shaping point;

[0176] Specifically, they include:

[0177] S4011: Determine a single maximum deformation excess value s at the top pressure correction point based on the absolute deformation ε at the top pressure correction point and the main body wall thickness t at the top pressure correction point;

[0178] Among them, the wall thickness gauge is used to detect the thickness at the top pressure correction point to obtain the wall thickness value t at this point.

[0179] Among them, based on ε and t, the maximum over-variable value s of a single deformation is determined. The corresponding relationship between s, ε, and t is shown in Table 1 below:

[0180] Table 1 Relationship between s, ε and t

[0181]

[0182]

[0183] S4012: Based on ε and s, the feed amount M of the cast iron ram 3 is obtained, and then the deformation amount L of the driving member 1 is determined;

[0184] The feed rate M of the cast iron ram 3 is the same as the deformation rate L of the driving member 1, and M satisfies:

[0185] M=ε+s Formula (1)

[0186] Among them, ε is the absolute deformation at the top pressure correction point, that is, the deformation value when the casting surface is concave or convex;

[0187] Among them, s is the maximum excess value of a single deformation to overcome the influence of the springback of the casting surface structure.

[0188] S4013: Based on L, obtain the heating temperature T of the driving member 1.

[0189] Based on the corresponding relationship between the deformation amount and temperature of the driver 1, a linear regression equation corresponding to the deformation amount and temperature of the driver 1 is obtained, as shown in the following formula (2).

[0190] y=0.8027*x-37.156 Formula (2)

[0191] Among them, y is the dependent variable, corresponding to the deformation L of the driving member 1, and x is the independent variable, corresponding to the temperature T of the driving member 1. The linear relationship between L and T is shown in the attached Figure 4 .

[0192] The above formula (2) is obtained based on the relationship data corresponding to the deformation amount and temperature of the driving member 1 in Table 2 below. The relationship data is shown in Table 2 below.

[0193] Table 2 Relationship between deformation of driving parts and temperature

[0194] Temperature (℃) 47.5 48 48.5 49 49.5 50 50.5 51 51.5 Elongation (mm) 1 1.6 2 2.4 2.6 2.9 3.2 3.4 3.9 Temperature (℃) 52 52.5 53 53.5 54 54.5 55 55.5 56 Elongation (mm) 4.5 5 5.3 5.7 6.2 6.4 7.1 7.6 8.1

[0195] In this way, after obtaining the deformation amount at the top pressure correction point and the main body wall thickness value at the top pressure correction point, the maximum single deformation excess value at the top pressure correction point is obtained based on Table 1, and then the feed amount of the cast iron top pressure head 3 is obtained based on formula (1), that is, the deformation amount of the driving part 1 is obtained; finally, the temperature value corresponding to the driving part 1 is obtained based on formula (2), and then the top pressure correction at the top pressure correction point is accurately achieved by controlling the temperature of the driving part 1.

[0196] S402: Power is supplied to the driving member 1 through the power supply assembly of the top pressure shaping device, causing the driving member 1 to deform and drive the cast iron top pressure head 3 to act on the surface of the casting to be shaped. The temperature of the driving member is detected by the temperature measuring thermocouple 8 at the rear end of the top pressure shaping device.

[0197] The heat source located inside the casting controls the internal driving member 1 to provide an ejection force, or the heat source located outside the casting controls the external driving member 1 to provide an ejection force to correct the casting.

[0198] Specifically, when the molding surface at the top pressure correction point is convex, the cast iron top pressure head 3 outside the casting is started to correct the convex top pressure correction point, and the cast iron top pressure head 3 located inside the casting assists in squeezing at the position to be corrected to avoid distortion near the top pressure correction point area.

[0199] When the molding surface at the top pressure correction point is concave, the cast iron top pressure head 3 inside the casting is started to correct the concave top pressure correction point, and the cast iron top pressure head 3 located outside the casting assists in squeezing the position to be corrected to avoid distortion near the top pressure correction point area.

[0200] The double-column hydraulic arm 12 is used to adjust the position of the cast iron jacking head 3 so as to assist in squeezing the cast iron jacking head 3 at the jacking and shaping point, and always squeeze at the jacking and shaping point.

[0201] Among them, when the driving member 1 is directly heated by electric current according to the set deformation requirement, the driving member 1 is deformed by heat, and the spiral shape becomes straight, pushing the transmission member 3 to move forward, driving the cast iron top pressure head 4 to move, and then the contact part between the casting and the cast iron top pressure head 4 is deformed.

[0202] S403: After the temperature of the driving element 1 reaches the set heating temperature, the temperature is kept warm, and the current is cut off after the temperature is kept warm.

[0203] Specifically, after the temperature of the driving component 1 reaches the set heating temperature, the insulation lasts for 5-10 seconds. During this time period, the temperature of the driving component is continuously detected by the rear-end temperature measuring thermocouple 8. If the temperature of the driving component 1 reaches the preset value, the circuit is disconnected and the power is stopped. If the temperature of the driving component 1 is lower than the preset value, the circuit is connected. In this way, based on the temperature detection result, the power circuit is controlled to be repeatedly turned on and off to achieve insulation of the driving component 1.

[0204] During the heat preservation period, the cast iron ram 3 for assisting extrusion at the ramming and shaping point is in a fixed state relative to the casting 9.

[0205] S404: performing high-frequency vibration treatment on the top pressure correction point to eliminate stress at the top pressure correction point;

[0206] Specifically, they include:

[0207] S4041: Remove the top pressure correction tooling and place the working end of the high-frequency vibration device in contact with the outer surface at the top pressure correction point;

[0208] Among them, the high-frequency vibration device can be a Huayun Hawken-vibration stress relief device, which contacts its working end with the outer surface of the casting shaping part to perform high-frequency vibration treatment on the casting shaping part.

[0209] S4042: Start the high-frequency vibration device;

[0210] Specifically, the vibration frequency is 400-500 Hz, and the vibration time is 20-35 s. Thus, after the top pressure correction point is corrected, the stress generated at the top pressure correction point is eliminated to avoid rebound of the part.

[0211] S4043: After the high-frequency vibration device vibrates at high frequency, the high-frequency vibration device is canceled.

[0212] Specifically, after the high-frequency vibration ends, the front end of the high-frequency vibration device contacts the outer surface at the top pressure correction point for 40-60 seconds, and then the high-frequency vibration device is removed to further reduce the risk of rebound at this part.

[0213] S405: Re-inspect the calibrated casting 9 until the deformation of the casting meets the contour requirement.

[0214] Specifically, they include:

[0215] S4051: Scan the calibrated casting to obtain a 3D model of the calibrated casting;

[0216] S4052: Align and assemble the theoretical model of the casting and the obtained three-dimensional model to obtain the absolute deformation of different deformation parts of the casting;

[0217] S4053: If the deformation amount of the deformed part of the casting meets the contour requirement, the casting correction is terminated;

[0218] S4054: If the deformation amount of the deformed part of the casting does not meet the contour requirement, return to step 1 until the deformation amount of the casting meets the contour requirement.

[0219] There is no need to dismantle the internal profiling tooling; the casting can be directly scanned and a secondary profiling plan can be formulated.

[0220] Example 2

[0221] A tool for top pressure shaping of thin-walled castings with irregular cross-sections, comprising a top pressure shaping device, a rear-end drive device, and a high-frequency vibration device for eliminating stress in local shaping parts of the casting;

[0222] The jacking shaping device includes a driving part 1, a transmission part 2, a cast iron jacking head 3, a support frame 4, a heat source and a mounting frame 10.

[0223] Specifically, the driving member 1 is a spiral Ni / Ti two-way shape memory alloy, one end of which is fixedly connected to the support frame 4 , and the other end of which is connected to the transmission member 2 .

[0224] When current is passed into the driving part 1, the Ni / Ti two-way memory alloy undergoes martensitic transformation, and the spiral shape straightens, squeezing the transmission part 2 to provide ejection force; after the temperature drops, it returns to the spiral shape to eliminate the ejection pressure.

[0225] After power is turned on, based on the thermal effect of current, the current flowing into the driver 1 does work, and the electrical energy is converted into internal energy, thereby causing the resistor in the driver 1 to heat up. After the resistor in the driver 1 heats up, the resistance value becomes larger and larger. According to q=u 2 / r*t, the resistance heating will become faster and faster, making the temperature higher and higher, thereby realizing the martensitic transformation of the Ni / Ti two-way memory alloy.

[0226] The magnitude of the ejection force generated by the driving member 1 is determined by the Ni / Ti two-way shape memory alloy. For example, the deformation force of the alloy is 200-350 MPa.

[0227] Among them, the shaping speed of the cast iron top pressure head 3 is determined by the two-way deformation of the Ni / Ti two-way memory alloy. The speed of the Ni / Ti two-way memory alloy in the two shape conversions matches the shaping speed of the casting and is much smaller than the shaping deformation speed allowed by the casting.

[0228] The deformation of the driving member 1 is controlled by the temperature. The specific corresponding relationship is shown in Table 2 above.

[0229] After obtaining the deformation of the part to be shaped and the main wall thickness of the deformed part of the casting, the maximum single deformation excess value is obtained based on Table 1, and then the feed amount of the cast iron top pressure head 3 is obtained based on formula (1), that is, the deformation of the driving part 1 is obtained; finally, the temperature value corresponding to the driving part 1 is obtained based on formula (2), and then the top pressure correction of the part to be shaped of the casting to be shaped is accurately achieved by controlling the temperature of the driving part 1.

[0230] Among them, the material of the connection between the support frame 4 and the driving part 1 is an insulating high-strength material. For example, the material is boron nitride high-temperature ceramic, which prevents the current passed into the driving part 1 from being transmitted to the support frame 4, and prevents the elastic deformation of this part itself during the deformation process of the driving part 1, resulting in top pressing failure or reduced top pressing efficiency, thereby improving the calibration accuracy.

[0231] Specifically, one end of the transmission member 2 is connected to the driving member 1, and the other end thereof is connected to the cast iron top pressure head 3, so as to transmit the top pressure of the driving member 1 to the cast iron top pressure head 3, thereby driving the cast iron top pressure head 3 to move to correct the casting.

[0232] Among them, the material of the transmission part 2 is an insulating high-strength material. For example, the material is boron nitride high-temperature ceramic, which prevents the current passed into the driving part 1 from being transmitted to the cast iron top pressure head 3, and during the deformation process of the driving part 1, prevents the elastic deformation of this part itself, resulting in top pressure failure or reduced top pressure efficiency, thereby improving the calibration accuracy.

[0233] A plane load-bearing bearing 5 is provided on the support frame 4 , and the transmission member 2 is slidably inserted into the plane load-bearing bearing 5 to ensure the stability of the movement of the transmission member 2 , thereby improving the stability of the cast iron ram 3 in ejection.

[0234] Specifically, one end surface of the cast iron ram 3 is connected to the transmission member 2, and the other end surface is the ram surface. Figure 3 As shown, during the shaping process, the top pressure surface abuts against the surface of the casting to be shaped.

[0235] The cast iron ram 3 is detachably connected to the transmission member 2 so as to adapt to the part of the casting to be shaped by adjusting the size of the cast iron ram 3 .

[0236] The moving direction of the transmission member 2 is perpendicular to the pressing surface of the cast iron pressing head 3 .

[0237] The size and position of the force application point are determined according to the effective area of ​​the casting to be shaped, and based on this, the size of the pressing surface of the cast iron ram 3 is designed.

[0238] Specifically, a front-end limit switch 6 is provided on the pressing surface of the cast iron top pressure head 3. During the calibration, the mold surface of the casting squeezes the front-end limit switch 6, causing it to retract within the cast iron top pressure head 3. At this time, the front-end limit switch 6 is in the triggered state, indicating that the constant pressure surface of the cast iron top pressure head 3 is in a fit state with the mold surface of the casting.

[0239] Among them, a signal generating device is provided in the cast iron top pressure head 3. When the front limit switch 6 is fully extended and retracted into the cast iron top pressure head 3, the signal generating device is triggered to ensure that the pressing surface of the cast iron top pressure head 3 is in contact with the surface to be corrected of the casting. Then the power supply component can be controlled to be turned on to pass current into the driving part 1 to control the deformation of the driving part 1.

[0240] Specifically, the heat source includes a power supply component, and the positive and negative electrodes 7 of the power supply component are respectively connected to the two ends of the driving component 1 to transmit current to the driving component 1.

[0241] When powered on, current flows from the positive electrode of the power supply assembly to one end of the driver 1 , and flows back to the negative electrode of the power supply assembly through the other end of the driver 1 .

[0242] Among them, the positive or negative pole of the power supply component is connected to the driving member 1 through the support frame 4, and the negative or positive end of the power supply component is connected to the other end of the driving member 1 through the support frame 4 and the transmission member 2, and maintains synchronous movement with the transmission member 2.

[0243] Specifically, the power supply component outputs low-voltage direct current, which is safe and reliable. For example, the voltage is 24V and the power is 1000-1500W.

[0244] Among them, a rear end temperature measuring thermocouple 8 is provided on the support frame 4, one end of the rear end temperature measuring thermocouple 8 passes through the transmission member 2 and is connected to the end of the driving member 1, and the other end is located outside the support frame 4. When the transmission member 2 moves, it keeps synchronous movement with the transmission member 2.

[0245] When the power is turned on, the temperature of the driving component 1 is measured by the rear-end temperature measuring thermocouple 8, and the feedback control circuit is turned on and off to control the transmission of current.

[0246] Specifically, the support frame 4 is a cavity structure, the driving member 1 is arranged in the cavity, the cast iron top pressure head 3 is located outside the cavity, and the wall of the support frame 4 has a heat insulation layer to reduce the temperature inside the cavity and the heat exchange efficiency outside the cavity, thereby avoiding heat loss when the driving member 1 heats up, improving the heating efficiency, and thus controlling the deformation rate of the driving member 1.

[0247] Among them, the wall materials of the support frame 4 are: from inside to outside: 1mm thick 304 stainless steel, 2-3mm thick high silica limiting cloth (silicon dioxide content greater than 95%), 2-3mm thick aluminum silicate fiber felt, 3-4mm thick 304 stainless steel plate.

[0248] In this way, the strength of the support frame is improved by the inner and outer layers of stainless steel plates, and the heat exchange efficiency inside and outside the support frame wall is reduced by the high silica limiting cloth and aluminum silicate limiting felt between the two layers of stainless steel plates, that is, it has thermal insulation function.

[0249] An opening is provided on one end surface of the support frame 4, and the rear-end temperature measuring thermocouple 8 and the negative pole or the positive pole of the power supply component are movable in the opening.

[0250] Among them, one end of the support frame 4 is the installation end for the cast iron jacking head 3, and the other end of the support frame 4 is the fixed end, which is connected to the rear end driving device for adjusting the position of the support frame to facilitate the adjustment of the position of the jacking shaping device.

[0251] Specifically, the rear end driving device includes: a direction adjustment support seat 11, a double-column hydraulic arm 12 and a worm gear 13.

[0252] Among them, one end of the direction adjustment support seat 11 is connected to the mounting frame 10, and the other end thereof is fixedly connected to the double-column hydraulic arm 12. The direction adjustment support seat 11 includes a driving gear 1101, a transmission gear 1102 and a driven gear 1103.

[0253] Among them, such as Figure 9 As shown, the driving gear 1101 is meshed with the two transmission gears 1102 , and the two transmission gears 1102 are meshed with the driven gear 1103 ; the driving gear 1101 drives the driven gear 1103 to rotate through the two transmission gears 1102 to adjust the tilt direction of the double-column hydraulic arm 12 .

[0254] Among them, one end of the double-column hydraulic arm 12 is fixedly connected to the middle part of the tooth surface of the driven gear 1103, and the other end is fixedly connected to the worm gear 13. The double-column hydraulic arm 12 is a first-stage transmission device, including two hydraulic arms that can be extended and retracted synchronously, so that the position of the worm gear 13 can be adjusted in the extension and retraction direction of the hydraulic arm.

[0255] A braking structure, such as a handbrake-like structure, may be provided at the driving gear 1101 . When the driven gear 1103 needs to be fixed, the driving gear 1101 is fixed by the braking structure to prevent the driven gear 1103 from rotating.

[0256] Among them, a frame can be provided for fixing the rotating shafts of the driving gear 1101, the transmission gear 1102 and the ends of the driven gear 1103. The frame avoids the position where the connection between the double-column hydraulic arm 12 and the driven gear 1103 rotates 180 degrees up and down.

[0257] Among them, one end of the worm gear 13 is fixedly connected to the double-column hydraulic arm 12, and the other end is connected to the support frame 4. The worm gear 13 is a two-stage transmission device. When it is in action, the cast iron top pressure head 3 at the front end of the support frame 4 is slightly moved toward the surface of the casting through the extension and contraction of the worm gear 13 until the front end limit switch 6 signal at the cast iron top pressure head 3 is triggered, and the worm gear 13 stops moving.

[0258] The telescopic direction of the worm gear 13 is consistent with the telescopic direction of the double-column hydraulic arm 12 .

[0259] Specifically, the mounting frame 10 includes a vertical support rod 1001 , a height fixing ring 1002 and a casting support beam 1003 .

[0260] The direction adjustment support seat 11 is installed on the height fixing ring 1002 , and the height fixing ring 1002 is installed on the vertical support rod 1001 .

[0261] Among them, the height position of the height fixing ring 1002 on the vertical support rod 1001 is adjustable, and the height fixing ring 1002 can also be fixed on the vertical support rod 1001 after being rotated. In this way, by adjusting the position of the height fixing ring 1002 on the vertical support rod 1001, the position of the direction adjustment support seat 11 can be adjusted, and then the cast iron top pressure head 3 can be adjusted to the position to be calibrated for the casting.

[0262] There are multiple height fixing rings 1002 , which can slide on the vertical support rod 1001 . The height fixing rings 1002 are fixedly connected to the vertical support rod 1001 by tightening bolts.

[0263] The height fixing ring 1002 can rotate around the vertical support rod 1001 , and the height fixing ring 1002 is fixedly connected to the vertical support rod 1001 by tightening bolts.

[0264] Among them, there are at least 5 vertical support rods 1001. When the casting is calibrated, 4 vertical support rods 1001 are distributed on the outside of the casting, and 1 vertical support rod 1001 is distributed in the inner cavity of the casting. Based on the distribution of the parts to be calibrated of the casting, multi-height fixed rings 1002 are set on the vertical support rods 1001 to achieve simultaneous calibration of multiple parts to be calibrated of the casting. In addition, when the casting is calibrated, the casting is clamped, fixed and calibrated by the cast iron top pressure heads 3 set inside and outside the casting.

[0265] Among them, there are at least two casting support beams 1003, wherein the two casting support beams 1003 are distributed up and down. During the shape adjustment, the casting is located between the two casting support beams 1003, and the upper and lower ends of the casting are fixed by the two casting support beams 1003.

[0266] The upper and lower ends of the vertical support rod 1001 are respectively connected to the casting support beam 1003 , and the vertical support rod 1001 and the casting support beam 1003 can be fastened together by connecting bolts.

[0267] The casting support beam 1003 is a "cross"-shaped structure, and the vertical support rod 1001 can adjust and fix the position of the casting support beam 1003 at the upper end.

[0268] Specifically, the high-frequency vibration device is a Huayun Hawken-vibration stress relief device, the working end of which contacts the outer surface of the casting shaping part, and performs high-frequency vibration treatment on the casting shaping part.

[0269] The high-frequency vibration device is detachably mounted on the mounting frame 10 .

[0270] The thin-walled casting top pressure correction device of the present invention is used to correct the casting, and the deformation correction range is 0.1-8mm. The one-time correction accuracy can reach 0.1mm / 40mm. The overall casting deformation correction qualified rate is increased by 5 times, from 26-30 hours / piece to 4-6 hours / piece, which significantly improves the correction accuracy and efficiency.

[0271] Those skilled in the art will appreciate that all or part of the process steps of the above-described embodiments can be implemented by instructing related hardware through a computer program, and the program can be stored in a computer-readable storage medium, such as a magnetic disk, an optical disk, a read-only memory, or a random access memory.

[0272] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with this technical field within the technical scope disclosed by the present invention should be covered by the scope of protection of the present invention.

Claims

1. A method for top pressing and shaping thin-walled castings with irregular cross-sections, characterized in that: include: Step 1: Based on the absolute deformation of different deformation parts of the casting, determine multiple top pressure correction parts; Step 2: Install top pressure correction devices at all top pressure correction locations to implement corresponding top pressure fixation inside and outside; Step 3: Obtain the absolute deformation of multiple top-pressing and shaping parts, and determine whether the absolute deformation of the top-pressing and shaping parts meets the casting profile requirements; Step 4: Take the top pressure correction part that does not meet the casting contour requirement as the top pressure correction point, and use the top pressure correction device to perform top pressure correction on the top pressure correction point; The step 4 comprises: S401: Setting the heating temperature of the driving member of the top pressing and shaping device according to the deformation data at the top pressing and shaping point; said step S401 includes: S4011: Determine a single maximum deformation excess value s at the top pressure correction point based on the absolute deformation ε at the top pressure correction point and the main body wall thickness t at the top pressure correction point; S4012: Based on ε and s, the feed amount M of the cast iron ram is obtained, and then the deformation amount L of the driving member is determined; S4013: Based on L, obtain the heating temperature T of the driving component; S402: Power is supplied to the driving component through the power supply assembly of the top pressure shaping device, causing the driving component to deform and drive the cast iron top pressure head to act on the surface of the part to be shaped. The temperature of the driving component is detected by the rear-end temperature measuring thermocouple of the top pressure shaping device. S403: After the temperature of the driving component reaches the set heating temperature, the temperature is kept warm, and the current is cut off after the temperature is kept warm. S404: performing high-frequency vibration treatment on the top pressure correction point to eliminate stress at the top pressure correction point; S405: Re-inspect the casting after correction until the deformation of the casting meets the contour requirements.

2. The method according to claim 1, characterized in that The step 1 comprises: S101: Obtaining the absolute deformation of different deformation parts of the casting; S102: Taking the deformed part with the maximum deformation as the base point, taking the reinforcing rib closest to the base point as the origin; S103: Arrange the top pressing and shaping parts based on the origin position to obtain multiple top pressing and shaping parts.

3. The method according to claim 2, wherein: In step S103, the top pressing and shaping parts are arranged in such a manner that the distance between adjacent top pressing and shaping parts is not greater than 1 / 8 of the perimeter of the cross section and the distance between adjacent contour surfaces is not greater than 200 mm.

4. The method according to claim 1, wherein In step S4012, the feed amount M of the cast iron ram is the same as the deformation amount L of the driving member, and M satisfies: M=ε+s.

5. The method according to claim 1, wherein In the step S4013, based on the corresponding relationship between the deformation L and the temperature T of the driver, a linear regression equation corresponding to the deformation L and the temperature T of the driver is obtained; Among them, y is the dependent variable, corresponding to the deformation L of the driving part, and x is the independent variable, corresponding to the temperature T of the driving part.

6. The method according to claim 5, characterized in that The linear regression equation is: y=0.8027*x-37.

156.

7. A tool for press-forming thin-walled castings with irregular cross-sections, used to implement the method of claim 1, characterized in that: The top pressure shaping tooling includes a top pressure shaping device, a rear end driving device and a high-frequency vibration device for eliminating stress at the local shaping part of the casting; The top pressure shaping device includes a driving member, a transmission member, a cast iron top pressure head, a support frame, a heat source and a mounting frame, wherein the heat source, the driving member, the transmission member and the cast iron top pressure head are integrated on the support frame; The rear end driving device is connected to the support frame and the mounting frame respectively, and is used to adjust the position of the support frame on the mounting frame; Wherein, the casting is fixed on the mounting frame.

8. The tool for top pressing and profiling according to claim 7, characterized in that: The deformation state of the driving member is different at different temperatures; The heat source controls the driving member to deform and extrude the transmission member, and the transmission member drives the cast iron top pressure head to extrude and correct the casting surface.

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