A method and tool for correcting the shape of a thin-walled casting by pressing

Abstract

The present application relates to a kind of thin-walled castings top pressure type correction method and type correction frock, belong to thin-walled castings type correction technical field, existing top pressure type correction device correction force, type correction amount and general-purposeness not strong technical problem is solved.The method includes: set the heating temperature of the driving element of top pressure type correction device;Top pressure type correction device is moved to the part to be corrected, so that the cast iron top pressure head of top pressure type correction device abuts the surface of castings part to be corrected;Power component is energized in driving element by top pressure type correction device, driving element occurs deformation driving cast iron top pressure head to be applied to the surface of castings part to be corrected, and the temperature of driving element is detected using the rear end temperature measuring thermocouple of top pressure type correction device;After driving element temperature reaches the set heating temperature, carry out heat preservation, disconnect current after heat preservation ends;High-frequency vibration treatment is carried out to the part of castings that has been corrected, to eliminate the stress of the part.The size of force point and the accurate control of type correction amount are realized, and it is convenient to use.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of thin-walled casting shape correction, in particular to a thin-walled casting top pressure shape correction method and a shape correction device. BACKGROUND

[0002] At present, there are two kinds of shape correction methods for thin-walled castings with cavities. One is to use a knocking device to correct the shape manually, which is time-consuming, labor-intensive and low in efficiency. The other is to use a top pressure machine to correct the shape. The existing top pressure machine generally uses a hydraulic device or a gear transmission mechanism to correct the shape. The structure of this type of top pressure machine is complex. As a driving device, the hydraulic device or the gear transmission mechanism necessarily needs corresponding pipelines or motors, which makes the overall top pressure machine heavy. For the demand of correcting the shape from the inside to the outside, the existing technology is difficult to operate, and it is even more difficult to control the deformation of the shape correction. SUMMARY

[0003] In view of the above analysis, the embodiments of the present application aim to provide a thin-walled casting top pressure shape correction method and a shape correction device to solve one of the problems that the existing top pressure shape correction device has low correction force, correction amount and universality. For the demand of correcting the shape from the inside to the outside, it is difficult to operate, and it is even more difficult to control the deformation of the shape correction.

[0004] On the one hand, the embodiments of the present application provide a thin-walled casting top pressure shape correction method, comprising:

[0005] Step 1: setting the heating temperature of the driving part of the top pressure shape correction device according to the deformation data of the part to be corrected of the casting;

[0006] Step 2: moving the top pressure shape correction device to the part to be corrected, so that the cast iron top pressure head of the top pressure shape correction device abuts against the part to be corrected of the casting;

[0007] Step 3: passing current to the driving part through the power supply assembly of the top pressure shape correction device, the driving part deforms to drive the cast iron top pressure head to act on the part to be corrected of the casting, and the temperature of the driving part is detected by the rear end temperature measuring thermocouple of the top pressure shape correction device;

[0008] Step 4: after the temperature of the driving part reaches the set heating temperature, heat preservation is carried out, and the current is disconnected after the heat preservation is completed;

[0009] Step 5: performing high-frequency vibration treatment on the part of the casting which has been corrected to eliminate the stress of the part.

[0010] Based on the further improvement of the above method, the step 1 comprises:

[0011] S101: obtaining the absolute deformation ε of the part to be corrected of the casting;

[0012] S102: obtaining the main body wall thickness t of the part to be corrected of the casting;

[0013] S103: determining a single deformation maximum variable value s based on ε and t;

[0014] S104: obtaining a feeding amount M of the cast iron top pressure head based on ε and s, and further determining a deformation amount L of the driving member;

[0015] S105: obtaining a heating temperature T of the driving member based on L.

[0016] Further improvement based on the above method, in the step S104, wherein the feeding amount M of the cast iron top pressure head is the same as the deformation amount of the driving member, M satisfies:

[0017] M = ε + s.

[0018] Wherein, ε is the absolute deformation amount of the castings to be corrected, that is, the deformation amount value when the castings profile is concave or convex.

[0019] Further improvement based on the above method, in the step S105, based on the corresponding relationship between the deformation amount L and the temperature T of the driving, the linear regression equation corresponding to the deformation amount L and the temperature T of the driving member is obtained;

[0020] Wherein, y is the dependent variable corresponding to the deformation amount L of the driving member, and x is the independent variable corresponding to the temperature T of the driving member.

[0021] Further improvement based on the above method, the linear regression equation is:

[0022] y = 0.8027 * x - 37.156.

[0023] Further improvement based on the above method, in the step 4, after the temperature of the driving member reaches the set heating temperature, the temperature is kept for 5-10s.

[0024] Further improvement based on the above method, the step 5 comprises:

[0025] S501: dismounting the top pressure correction device, and contacting the working end of the high-frequency vibration device with the outer profile surface of the castings corrected part;

[0026] S502: starting the high-frequency vibration device;

[0027] S503: after the high-frequency vibration device vibrates at high frequency, the high-frequency vibration device is removed.

[0028] Further improvement based on the above method, in the step S503, after the high-frequency vibration ends, the working end of the high-frequency vibration device is in contact with the outer profile surface of the castings corrected part for 40-60s, and then the high-frequency vibration device is removed.

[0029] In one aspect, the embodiment of the present application provides a thin-walled casting shape correction tool for realizing the thin-walled casting top pressure shape correction method, the shape correction tool comprising a top pressure shape correction device and a high-frequency vibration device for eliminating the stress of a local shape correction part of the casting, the top pressure shape correction device comprising a driving member, a transmission member, a cast iron top pressure head, a support frame and a heat source, the heat source, the driving member, the transmission member and the cast iron top pressure head being integrally arranged on the support frame.

[0030] The heat source controls the deformation of the driving member to extrude the transmission member, and the cast iron top pressure head is driven by the transmission member to extrude the casting profile for shape correction.

[0031] Based on the further improvement of the shape correction tool, the deformation state of the driving member at different temperatures is different.

[0032] The top pressure shape correction device further comprises a rear-end temperature measuring thermocouple for detecting the temperature of the driving member.

[0033] Compared with the prior art, the present application can achieve at least one of the following beneficial effects:

[0034] 1. According to the deformation data of the casting part to be corrected, the heating temperature of the driving member is set, the deformation amount of the driving member is accurately controlled by controlling the heating temperature of the driving member, and the accuracy of the shape correction amount of the casting part to be corrected is realized, thereby improving the shape correction accuracy of the casting; and the risk of springback of the casting shape correction part is reduced by heat preservation after the temperature of the driving member reaches the temperature, and the risk of springback of the casting shape correction part is further reduced by stress relief of the casting shape correction part, thereby improving the shape correction efficiency and accuracy of the casting.

[0035] 2. The heat source controls the driving member to change its own shape to extrude the transmission member, and the cast iron top pressure head is driven by the transmission member to move, thereby realizing the shape correction of the casting, and the structure is simple, without the need to set a complex mechanical force transmission mechanism, so that the top pressure shape correction device is small and light.

[0036] 3. By controlling the temperature parameters of the driving member, the deformation amount of the driving member is controlled, that is, the single correction amount is controlled, different deformation parts are adapted, and the size of the cast iron top pressure head is adjusted to adapt to the size of the deformation part, so that the size of the force point and the shape correction amount are accurately controlled, and the universality of the shape correction device is improved.

[0037] 4. 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 improved by 5 times, from 26-30 hours / piece to 4-6 hours / piece, and the shape correction accuracy and efficiency are significantly improved.

[0038] The technical solutions in the present application can be combined with each other to realize more preferred combination solutions. Other features and advantages of the present application will be described in the following description, and some advantages will become apparent from the description, or will be understood by those skilled in the art through implementation of the present application. The purposes and other advantages of the present application can be realized and obtained through the contents particularly pointed out in the description and the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0039] The accompanying drawings are included to provide a further understanding of the present application, and are incorporated herein and constitute a part of the detailed description. The drawings illustrate embodiments of the present application and, together with the description, serve to explain the principles of the present application. In the drawings:

[0040] Figure 1 Structure schematic view of the thin-wall casting top pressure type correcting device of the present application;

[0041] Figure 2 Structure schematic view of the thin-wall casting type correcting device supported by the mounting frame in the present application;

[0042] Figure 3 Structure schematic view of the thin-wall casting type correcting device supported by the mounting frame in the present application; Figure 2

[0043] Figure 4 Linear schematic view of the correspondence between the deformation amount and the temperature of the driving member in the present application;

[0044] Figure 5 Structure schematic view of the two thin-wall casting top pressure type correcting devices in the present application at the same deformation position of the inner and outer cavities of the casting;

[0045] Figure 6 Flow chart of the thin-wall casting top pressure type correcting method in the present application;

[0046] Figure 7 Structure schematic view of the cooperation between the rear-end driving device and the supporting frame in the present application;

[0047] Figure 8 Structure schematic view of the cross section of the casting in the present application;

[0048] Figure 9 Structure schematic view of the direction adjusting supporting seat in the present application.

[0049] Reference signs:

[0050] ​1-driving member; 2-transmission member; 3-cast iron top pressure head; 4-support frame; 5-flat load bearing bearing; 6-front end limit switch; 7-positive and negative poles of power supply assembly; 8-rear end temperature measuring thermocouple; 9-cast; 10-mounting frame; 1001-vertical support rod; 1002-height fixing ring; 1003-cast support beam; 11-direction adjusting support seat; 1101-driving gear; 1102-transmission gear; 1103-driven gear; 12-double column hydraulic arm; 13-turbine worm. DETAILED DESCRIPTION

[0051] The preferred embodiments of the present application will be described in detail below with reference to the drawings, which form a part of this application, and together with the description, illustrate the principles of the application, and are used to explain the application's scope to those skilled in the art.

[0052] A cast for an aviation product has a thin-walled cavity, and the cast needs to be calibrated before assembly application to meet the use requirements.

[0053] Because the cast has a thin wall thickness and a large volume, it is not easy to clamp and fix, and the top pressure machine structure is complex and heavy, and is inconvenient to install, and for thin-walled parts, the existing top pressure machine may affect the profile near the deformation part during calibration, so that the cast profile precision cannot meet the requirements.

[0054] It can be seen that the force, calibration amount and universality of the traditional mechanical calibration are not strong, and for the demand of calibration from inside to outside, the existing technology is difficult to operate, and it is even more difficult to control the deformation of the calibration. Therefore, the top pressure machine is not generally used for calibration, but the artificial knocking method is used for calibration.

[0055] The artificial knocking calibration method cannot accurately grasp the size of the force point and the calibration amount, and for the deep part of the cast cavity, such as the top of the cast cavity, artificial knocking calibration is more laborious, and it takes a long time and has low calibration efficiency.

[0056] To solve the above problems, the present application provides a thin-walled cast top pressure calibration method, comprising:

[0057] Step 1: according to the deformation data of the cast part to be calibrated, the heating temperature of the driving member of the top pressure calibration device is set;

[0058] Step 2: move the top pressure calibration device to the part to be calibrated, so that the cast iron top pressure head of the top pressure calibration device abuts against the profile of the cast part to be calibrated;

[0059] Step 3: power is supplied to the driving member through the power supply assembly of the top pressure calibration device, the driving member is deformed to drive the cast iron top pressure head to act on the profile of the cast part to be calibrated, and the temperature of the driving member is detected by the rear end temperature measuring thermocouple of the top pressure calibration device;

[0060] Step 4: After the temperature of the driving member reaches the set heating temperature, heat preservation is carried out, and the current is disconnected after the heat preservation is completed;

[0061] Step 5: High-frequency vibration treatment is carried out on the part of the casting to be corrected to eliminate the stress of the part.

[0062] Compared with the prior art, the present application sets the heating temperature of the driving member 1 according to the deformation data of the part of the casting to be corrected, precisely controls the deformation amount of the driving member 1 by controlling the heating temperature of the driving member 1, and then realizes precise control of the correction amount of the part of the casting to be corrected, thereby improving the correction accuracy of the casting; and by carrying out heat preservation after the temperature of the driving member reaches the set heating temperature, the risk of rebound of the part of the casting to be corrected is reduced, and by carrying out stress elimination on the part of the casting to be corrected, the risk of rebound of the part of the casting to be corrected is further reduced, thereby improving the correction efficiency and accuracy of the casting.

[0063] Specifically, in step 1, it includes:

[0064] S101: Obtain the absolute deformation amount ε of the part of the casting to be corrected;

[0065] S102: Obtain the main body wall thickness value t of the part of the casting to be corrected;

[0066] S103: Determine the maximum over-deformation value s of single deformation based on ε and t;

[0067] Wherein, the maximum over-deformation value s of single deformation is determined based on the absolute deformation amount ε of the part of the casting to be corrected and the main body wall thickness value t of the part, and the corresponding relationship between s, ε and t is shown in Table 1.

[0068] Table 1 Corresponding relationship between s, ε and t

[0069]

[0070] S104: Obtain the feeding amount M of the cast iron top pressure head 3 based on ε and s, and then determine the deformation amount L of the driving member 1;

[0071] Wherein, the feeding amount M of the cast iron top pressure head 3 is the same as the deformation amount of the driving member 1, and M satisfies:

[0072] M = ε + s Equation (1)

[0073] Wherein, ε is the absolute deformation amount of the part of the casting to be corrected, that is, the deformation amount value when the casting surface is concave or convex;

[0074] Wherein, s is the maximum over-deformation value of single deformation, which is used to overcome the influence of the rebound of the casting surface structure.

[0075] S105: Obtain the heating temperature T of the driving member 1 based on L.

[0076] Based on the corresponding relationship between the deformation amount of the driving member 1 and the temperature, a linear regression equation corresponding to the deformation amount and the temperature of the driving member 1 is obtained, as shown in the following formula (2).

[0077] y = 0.8027 * x - 37.156 Formula (2)

[0078] Wherein, y as the dependent variable, corresponding to the deformation amount L of the driving member 1, x as the independent variable, corresponding to the temperature T of the driving member 1, wherein the linear relationship between L and T is shown in the following table 1. Figure 4 .

[0079] Wherein, based on the relationship data between the deformation amount and the temperature of the driving member 1 in the following table 2, the above formula (2) is obtained, and the relationship data is shown in the following table 2.

[0080] Table 2 Relationship between driving member deformation and temperature

[0081] Temperature (°C) 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 (°C) 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

[0082] Specifically, in step 2, as shown in Figure 5 , one top pressure type correction device is arranged at the same deformation position of the inner and outer cavities of the casting, and the positive and negative action force is corrected.

[0083] Wherein, the size and position of the force point are determined according to the effective area of the casting to be corrected, and the size of the cast iron top pressure head 3 is designed based on this.

[0084] Specifically, in step 3, when the casting to be corrected is convex, the outer top pressure type correction device of the casting is started to correct the convex part to be corrected, and the top pressure type correction device in the casting is used to assist extrusion at the part to be corrected, so as to avoid distortion of the area near the part to be corrected.

[0085] When the casting to be corrected is concave, the internal top pressure type correction device of the casting is started to correct the concave part to be corrected, and the top pressure type correction device outside the casting is used to assist extrusion at the part to be corrected, so as to avoid large area deformation of the area near the part to be corrected.

[0086] Wherein, the position of the top pressure type correction device is adjusted by the mounting frame 10, so as to realize the top pressure type correction device for assisting extrusion at the part to be corrected, and always extruding at the part to be corrected.

[0087] Specifically, in step 4, the heat preservation process is: after the temperature of the driving member 1 reaches the set heating temperature, the heat preservation lasts for 5-10s, and in this process, the top pressure type correction device for assisting extrusion at the part to be corrected is in a fixed state relative to the casting.

[0088] Specifically, in step 5, high frequency vibration device is used to eliminate stress of the corrected part of the casting.

[0089] In order to realize the thin-walled part top pressure correction method, the application also provides a thin-walled casting correction tool, which comprises a top pressure correction device and a high-frequency vibration device for eliminating local correction stress of the casting.

[0090] The top pressure correction device comprises a driving member 1, a transmission member 2, a cast iron top pressure head 3, a support frame 4 and a heat source. Figure 1 As shown in the figure, the heat source, the driving member 1, the transmission member 2 and the cast iron top pressure head 3 are integrally arranged on the support frame 4.

[0091] The heat source controls the deformation of the driving member 1 to extrude the transmission member 2, and the cast iron top pressure head 3 is driven by the transmission member 2 to extrude and correct the casting surface.

[0092] The driving member 1 has different states at different temperatures. When heated, the driving member 1 is in an expanded state to extrude the transmission member 2, and then the transmission member 2 drives the cast iron top pressure head 3 to move, so as to finally realize the correction of the thin-walled casting.

[0093] Further, the driving member 1 is a conductor, and the heat source comprises a power supply assembly for transmitting current to the inside of the driving member 1. In this way, the current flows in the inside of the driving member 1, the electric energy is converted into internal energy, the temperature in the inside of the driving member 1 is changed, and the shape of the driving member 1 is changed.

[0094] In a possible implementation, the material of the driving member 1 is Ni / Ti two-way memory alloy. After the current is passed, the electric energy is converted into internal energy, the temperature rises, the Ni / Ti two-way memory alloy undergoes martensitic transformation, the driving member 1 deforms, and after the temperature decreases, the driving member 1 can restore to the original state.

[0095] Specifically, the shape of the driving member 1 is spiral. After the current is passed, the Ni / Ti two-way memory alloy undergoes martensitic transformation, the spiral shape is straightened, the ejection force is provided, and after the temperature decreases, the spiral shape is restored. In this way, in the moving direction of the cast iron top pressure head 3, the spiral structure of the driving member can provide a larger deformation amount to adapt to the casting surface with different deformations.

[0096] The two ends of the driving member 1 are connected with the positive and negative electrodes 7 of the power supply assembly respectively. Based on the heat effect of the current, the temperature of the driving member will become higher and higher within the current time. At this time, with the increase of the temperature, the spiral deformation continuously elongates, the deformation stops during the heat preservation, and the spiral Ni / Ti two-way memory alloy cools and rebounds and shrinks when the power is off.

[0097] Further, a rear end temperature measuring thermocouple 8 is arranged on the support frame 1 to measure the temperature of the driving member 1. The rear end temperature measuring thermocouple 8 is a point contact type thermocouple to set the heating temperature of the spiral Ni / Ti two-way memory alloy according to the deformation data of the casting top pressure part, so as to control the correction amount.

[0098] Further, the front end limit switch 6 is arranged on the cast iron top pressing head 3, and the front end limit switch 6 is a signal triggering device, which triggers when the cast iron top pressing head 3 contacts the casting profile, so as to determine the position of the cast iron top pressing head 3.

[0099] Specifically, one end of the transmission member 2 is connected with the cast iron top pressing head 3, and the other end is connected with one end of the driving member 1, so as to transmit the deformation generated by the deformation of the driving member 1 to the cast iron top pressing head 3, and make the cast iron top pressing head 3 move relative to the support frame 4.

[0100] The other end of the driving member 1 is fixedly installed on the support frame 4, so as to transmit the deformation generated by the deformation of the driving member 1 to the transmission member 3.

[0101] Further, as shown in Figure 2 one end of the support frame 4 is a mounting end for the cast iron top pressing head 3, and the other end is a fixed end connected with the mounting frame 10 outside for adjusting the position of the support frame 4, so as to adjust the position of the top pressing and profiling device.

[0102] The high-frequency vibration device can be a vibration stress relief device, and an example can be a Huayun Haokeng vibration stress relief device, which is in contact with the outer surface of the casting profiling part at the working end, and performs high-frequency vibration treatment on the casting profiling part.

[0103] Compared with the prior art, the heating temperature of the driving member 1 is set according to the deformation data of the casting profiling part, the deformation amount of the driving member 1 is accurately controlled by controlling the heating temperature of the driving member 1, and then the accurate control of the profiling amount of the casting profiling part is realized, and the casting profiling precision is improved; and the risk of springback of the casting profiling part is reduced by heat preservation after the temperature of the driving member reaches, and the risk of springback of the casting profiling part is further reduced by stress relief of the casting profiling part, so as to improve the profiling efficiency and precision of the casting.

[0104] The driving member 1 changes its own shape by the heat source to extrude the transmission member 2, the cast iron top pressing head 3 is driven to move by the transmission member 2, and then the casting profiling is realized, the structure is simple, and a complex mechanical force transmission mechanism is not needed, so that the top pressing and profiling device is small and light.

[0105] By controlling the temperature parameters of the driving member, the deformation amount of the driving member is controlled, the single profiling amount is controlled, different deformation parts are adapted, the size of the cast iron top pressing head is adjusted to adapt to the size of the deformation part, the size of the force point and the accurate control of the profiling amount are realized, and the universality of the device is improved.

[0106] 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, and the mold correction accuracy and efficiency are significantly improved.

[0107] Embodiment 1

[0108] A thin-walled casting top pressure mold correction method, comprising:

[0109] Step 1: Set the heating temperature of the driving part 1 according to the deformation data of the part to be corrected of the casting;

[0110] Specifically, it comprises:

[0111] S101: Obtain the absolute deformation amount ε of the part to be corrected of the casting;

[0112] Specifically, the casting 9 is scanned to obtain a three-dimensional model of the casting; and based on the drawing processing reference, the theoretical model of the casting and the three-dimensional model obtained by scanning are aligned and assembled to measure to obtain the absolute deformation amount ε of different parts of the casting.

[0113] S102: Obtain the main wall thickness value t of the part to be corrected of the casting;

[0114] Specifically, the thickness of the part to be corrected of the casting is detected by using a wall thickness instrument to obtain the wall thickness value t at the part.

[0115] S103: Determine the maximum over-variable value s of single deformation based on ε and t;

[0116] Wherein, the maximum over-variable value s of single deformation is determined based on the absolute deformation amount ε of the part to be corrected of the casting and the main wall thickness value t of the part, and the corresponding relationship of s, ε and t is shown in Table 1.

[0117] S104: Obtain the feeding amount M of the cast iron top pressure head 3 based on ε and s, and further determine the deformation amount L of the driving part 1;

[0118] Wherein, the feeding amount M of the cast iron top pressure head 3 is the same as the deformation amount of the driving part 1, and M satisfies:

[0119] M=ε+s Equation (1)

[0120] Wherein, ε is the absolute deformation amount at the part to be corrected of the casting, that is, the deformation amount value when the casting surface is concave or convex;

[0121] Wherein, s is the maximum over-variable value of single deformation, to overcome the influence of the rebound of the casting surface structure.

[0122] S105: Obtain the heating temperature T of the driving part 1 based on L.

[0123] Based on the corresponding relationship between the deformation amount and the temperature of the driving part 1, a linear regression equation corresponding to the deformation amount and the temperature of the driving part 1 is obtained, as shown in the following formula (2).

[0124] y = 0.8027 * x - 37.156 Formula (2)

[0125] wherein y is the dependent variable corresponding to the deformation amount L of the driving part 1, and x is the independent variable corresponding to the temperature T of the driving part 1, and the linear relationship between L and T is shown in the following table 2. Figure 4 .

[0126] wherein the above formula (2) is obtained based on the relationship data between the deformation amount and the temperature of the driving part 1 in the above table 2.

[0127] Therefore, after obtaining the deformation amount of the part to be corrected of the casting and the wall thickness value of the deformation part of the casting, the maximum over-deformation value of single deformation is obtained based on table 1, 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, and finally the temperature value corresponding to the driving part 1 is obtained based on formula (2), so as to realize accurate correction of the part to be corrected of the casting by controlling the temperature of the driving part 1.

[0128] Step 2: Move the top pressure correction device to the part to be corrected, so that the cast iron top pressure head 4 of the top pressure correction device abuts the surface of the part to be corrected of the casting;

[0129] Specifically, one top pressure correction device is arranged at the same deformation part of the inner and outer cavities of the casting, respectively, to perform positive and negative action force correction.

[0130] Step 3: Power the driving part by the power supply assembly of the top pressure correction device, so that the driving part 1 deforms to drive the cast iron top pressure head 3 to act on the surface of the part to be corrected of the casting, and the temperature of the driving part 1 is detected by the rear end temperature measuring thermocouple 8 of the top pressure correction device.

[0131] Specifically, when the part to be corrected of the casting is convex outward, the external top pressure correction device of the casting is started to correct the part to be corrected which is convex outward, and the top pressure correction device located in the inner part of the casting is used to assist extrusion at the part to be corrected, so as to avoid distortion of the area near the part to be corrected of the casting.

[0132] When the part to be corrected of the casting is concave inward, the internal top pressure correction device of the casting is started to correct the part to be corrected which is concave inward, and the top pressure correction device located in the outer part of the casting is used to assist extrusion at the part to be corrected, so as to avoid distortion of the area near the part to be corrected of the casting.

[0133] wherein the position of the top pressure correction device is adjusted by the mounting bracket 10 of the top pressure correction device, so that the top pressure correction device used for assisting extrusion at the part to be corrected is always extruded at the part to be corrected.

[0134] Wherein, when the driving part 1 is directly current heated according to the set deformation requirement, the driving part 1 is heated and deformed, the spiral shape is straightened, the transmission part 3 is pushed to move forward, the cast iron top pressing head 4 is driven to move, and then the deformation occurs at the contact part between the casting and the cast iron top pressing head 4.

[0135] Step 4: After the temperature of the driving part 1 reaches the set heating temperature, the temperature is kept, and after the temperature keeping is finished, the current is turned off.

[0136] Specifically, after the temperature of the driving part 1 reaches the set heating temperature, the temperature is kept for 5-10s, and in this time period, the temperature of the driving part is continuously detected by the rear temperature measuring thermocouple 8, if the temperature of the driving part 1 reaches the preset value, the circuit is turned off, the power supply is stopped, if the temperature of the driving part 1 is lower than the preset value, the circuit is turned on, thus, based on the detection result of the temperature, the power supply circuit is repeatedly turned on and turned off, the temperature keeping of the driving part 1 is realized, and the risk of rebound of the deformed part of the casting is avoided.

[0137] In the temperature keeping time period, the top pressing and shaping device for assisting in extruding at the deformed part is in a fixed state relative to the casting.

[0138] Step 5: The deformed part of the casting is processed by high frequency vibration to eliminate the stress of the deformed part.

[0139] Specifically, it includes:

[0140] S501: The top pressing and shaping device is removed, and the working end of the high frequency vibration device is contacted with the outer surface of the deformed part of the casting.

[0141] Wherein, the high frequency vibration device is a Huayunhaoke energy-vibration stress relieving equipment.

[0142] S502: The high frequency vibration device is started.

[0143] Specifically, the vibration frequency is 400-500Hz, and the vibration time is 20-35s, so as to eliminate the stress of the deformed part of the casting and avoid the rebound of the part.

[0144] S503: After the high frequency vibration of the high frequency vibration device, the high frequency vibration device is removed.

[0145] Specifically, after the high frequency vibration is finished, the working end of the high frequency vibration device is contacted with the outer surface of the deformed part of the casting for 40-60s, and then the high frequency vibration device is removed, so as to further reduce the risk of rebound of the part.

[0146] Step 6: The deformed casting is rechecked until the deformation of the casting meets the contour requirement.

[0147] Specifically, it includes:

[0148] S601: scanning the shaped casting to obtain a three-dimensional model of the shaped casting;

[0149] S602: aligning and assembling the casting theoretical model and the obtained three-dimensional model to measure the absolute deformation of different deformation parts of the casting;

[0150] S603: if the deformation of the casting meets the profile requirement, terminate the shaping of the casting;

[0151] S604: if the deformation of the casting does not meet the profile requirement, return to step 1 until the deformation of the casting meets the profile requirement.

[0152] Wherein, the profile requirement is determined based on the processing technical requirement, and the absolute deformation within the range of 0.5mm meets the profile requirement.

[0153] Example 2

[0154] A thin-walled casting top pressure shaping tool, comprising a top pressure shaping device and a high-frequency vibration device for eliminating the stress of the local shaping part of the casting.

[0155] Wherein, the casting shaping device comprises a driving member 1, a transmission member 2, a cast iron top pressure head 3, a support frame 4 and a heat source.

[0156] Specifically, the driving member 1 is a spiral Ni / Ti two-way memory alloy, one end of which is fixedly connected with the support frame 4, and the other end is connected with the transmission member 2.

[0157] After current is passed into the driving member 1, the Ni / Ti two-way memory alloy undergoes martensitic transformation, the spiral shape is straightened, the transmission member 2 is extruded to provide the ejection force, and after the temperature decreases, it returns to the spiral shape to eliminate the top pressure.

[0158] Wherein, after electrification, based on the current heat effect, the current passed into the driving member 1 does work, and the electrical energy is converted into internal energy, so that the resistance in the driving member 1 generates heat, and after the resistance in the driving member 1 generates heat, the resistance value becomes larger and larger, according to q=u 2 / r*t, the resistance heating will become faster and faster, the temperature will become higher and higher, and then the Ni / Ti two-way memory alloy undergoes martensitic transformation.

[0159] Wherein, the size of the ejection force generated by the driving member 1 is determined by the Ni / Ti two-way memory alloy, and the deformation force of the alloy is 200-350MPa.

[0160] Wherein, 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, and the speed of the Ni / Ti two-way memory alloy in two shape conversions is matched with the shaping speed of the casting, which is much smaller than the allowable shaping deformation speed of the casting.

[0161] Wherein, the amount of deformation of the driving member 1 is controlled by temperature.

[0162] Wherein, the material of the support frame 4 at the connection with the driving member 1 is a heat-insulating high-strength material, for example, boron nitride high-temperature ceramic, to avoid the current flowing into the driving member 1 from being transmitted to the support frame 4, and to avoid the elastic deformation of the part itself during the deformation of the driving member 1, causing the pressing failure or reducing the pressing efficiency, thereby improving the accuracy of the type correction.

[0163] Specifically, one end of the transmission member 2 is connected with the driving member 1, and the other end is connected with the cast iron pressing head 3, to transmit the pressing force of the driving member 1 to the cast iron pressing head 3, and to drive the cast iron pressing head 3 to move, so as to correct the type of the casting.

[0164] Wherein, the material of the transmission member 2 is a heat-insulating high-strength material, for example, boron nitride high-temperature ceramic, to avoid the current flowing into the driving member 1 from being transmitted to the cast iron pressing head 3, and to avoid the elastic deformation of the part itself during the deformation of the driving member 1, causing the pressing failure or reducing the pressing efficiency, thereby improving the accuracy of the type correction.

[0165] Wherein, the support frame 4 is provided with a plane bearing 5, and the transmission member 2 is slidingly inserted into the plane bearing 5, to ensure the stability of the movement of the transmission member 2, and to improve the stability of the pressing of the cast iron pressing head 3.

[0166] Specifically, one end surface of the cast iron pressing head 3 is connected with the transmission member 2, and the other end surface is a pressing surface, as shown in Figure 3 When correcting the type, the pressing surface abuts against the type surface of the casting.

[0167] Wherein, the cast iron pressing head 3 is detachably connected with the transmission member 2, to adapt to the part to be corrected of the casting by adjusting the size of the cast iron pressing head 3.

[0168] Wherein, the moving direction of the transmission member 2 is perpendicular to the pressing surface of the cast iron pressing head 3.

[0169] Wherein, the size and position of the force application point are determined according to the effective area of the part to be corrected of the casting, and based on this, the size of the pressing surface of the cast iron pressing head 3 is designed.

[0170] Specifically, a front end limit switch 6 is arranged on the pressing surface of the cast iron pressing head 3, and when correcting the type, the type surface of the casting presses the front end limit switch 6, so that it is extended and retracted in the cast iron pressing head 3. At this time, the front end limit switch 6 is in a triggered state, indicating that the pressing surface of the cast iron pressing head 3 is in a state of abutting against the type surface of the casting.

[0171] Wherein, in the cast iron top pressure head 3 is equipped with signal generating device, front end limit switch 6 is completely stretched to the cast iron top pressure head 3 inside, signal generating device triggers, to determine the cast iron top pressure head 3 the pressure surface is attached in the castings the type surface to be corrected, then can control power component switch-on, to the drive piece 1 inside passes through the current, to control drive piece 1 deformation.

[0172] Specifically, the heat source includes a power component, the positive and negative poles of the power component are connected with the two ends of the drive piece 1 respectively, to transmit the current to the drive piece 1.

[0173] When the power is on, the current flows from the positive pole of the power component to one end of the drive piece 1, and returns to the negative pole of the power component through the other end of the drive piece 1.

[0174] Wherein, the positive or negative pole of the power component is connected with the drive piece 1 through the support frame 4, and the negative or positive pole of the power component is connected with the other end of the drive piece 1 through the support frame 4 and the transmission piece 2, and moves synchronously with the transmission piece 2.

[0175] Specifically, the power component outputs low-voltage direct current, which is safe and reliable. For example, the voltage is 24V, and the power is 1000-1500W.

[0176] Wherein, the rear end temperature measuring thermocouple 8 is arranged on the support frame 4, one end of the rear end temperature measuring thermocouple 8 penetrates through the transmission piece 2 and is connected with the end of the drive piece 1, and the other end is located outside the support frame 4, and moves synchronously with the transmission piece 2 when the transmission piece 2 moves.

[0177] When the power is on, the temperature of the drive piece 1 is measured by the rear end temperature measuring thermocouple 8, and the on-off of the feedback control circuit is fed back to control the transmission of the current.

[0178] Specifically, the support frame 4 is a cavity structure, the drive piece 1 is arranged in the cavity, the cast iron top pressure head 3 is located outside the cavity, and the wall surface of the support frame 4 has a heat insulation layer to reduce the heat exchange efficiency between the inside and outside of the cavity, thereby avoiding heat loss when the drive piece 1 is heated, improving the heating efficiency, and thereby controlling the deformation rate of the drive piece 1.

[0179] Wherein, the wall surface material of the support frame 4 is: 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, and 3-4mm thick 304 stainless steel plate.

[0180] In this way, the strength of the support frame is improved by the two layers of stainless steel plates inside and outside, and the heat exchange efficiency between the inside and outside of the support frame wall is reduced by the high-silica limiting cloth and the aluminum silicate limiting felt between the two layers of stainless steel plates, that is, the support frame has the functions of heat preservation and heat insulation.

[0181] Wherein, an opening is arranged on one end surface of the support frame 4, and the rear end temperature measuring thermocouple 8 and the negative or positive electrode of the power supply assembly are movably arranged in the opening.

[0182] Specifically, one end of the support frame 4 is a mounting end for the cast iron top pressure head 3, and the other end of the support frame 4 is a fixed end connected with an external mounting frame for adjusting the position of the support frame, so as to adjust the position of the top pressure type correction device.

[0183] Wherein, the high-frequency vibration device is a spring high-frequency vibration device, which is detachably mounted on the mounting frame.

[0184] Embodiment 3

[0185] A thin-walled cast top pressure type correction tool, which is different from the embodiment 2 in that:

[0186] A rear end driving device is arranged outside the support frame 4, so as to adjust the position of the support frame 4 through the rear end driving device, and then adjust the position of the cast iron top pressure head 3.

[0187] Specifically, the rear end driving device includes a direction adjusting support seat 11, a double-column hydraulic arm 12 and a worm gear 13.

[0188] Wherein, one end of the direction adjusting support seat 11 is connected with the mounting frame 10, and the other end is fixedly connected with the double-column hydraulic arm 12, as shown in the figure, the direction adjusting support seat 11 can be a mechanical arm or a gear transmission structure, which can realize the adjustment of the inclination direction of the double-column hydraulic arm 12. Figure 7

[0189] Exemplarily, the direction adjusting support seat 11 can include a driving gear 1101, a transmission gear 1102 and a driven gear 1103; as shown in the figure, the driving gear 1101 is engaged with the two transmission gears 1102, and the two transmission gears 1102 are engaged with the driven gear 1103; the driving gear 1101 drives the driven gear 1103 to rotate through the two transmission gears 1102, so as to adjust the inclination direction of the double-column hydraulic arm 12. Figure 9

[0190] Wherein, a brake structure such as a handbrake structure can be arranged at the driving gear 1101, when it is needed to fix the driven gear 1103, the driving gear 1101 is fixed through the brake structure, so as to prevent the driven gear 1103 from rotating.

[0191] Wherein, a frame for fixing the driving gear 1101, the transmission gear 1102 and the driven gear 1103 end rotating shaft can be arranged, and the frame avoids the position of the driven gear 1103 rotating up and down by 180°.

[0192] ​​Wherein, one end of the double-column hydraulic arm 12 is fixedly connected with the middle part of the tooth surface of the driven gear 1103, and the other end is fixedly connected with the worm gear 13. The double-column hydraulic arm 12 is a first-stage transmission device, and includes two hydraulic arms capable of synchronous extension and contraction. In this way, the position of the worm gear 13 is adjusted in the extension and contraction direction of the hydraulic arm.

[0193] Wherein, a brake structure, such as a handbrake structure, can be arranged at the driving gear 1101. When it is necessary to fix the driven gear 1103, the driving gear 1101 is fixed by the brake structure to prevent the driven gear 1103 from rotating.

[0194] Wherein, a frame for fixing the driving gear 1101, the transmission gear 1102 and the end rotating shaft of the driven gear 1103 can be arranged. The frame avoids the position of 180° rotation of the connection part of the double-column hydraulic arm 12 and the driven gear 1103.

[0195] Wherein, one end of the worm gear 13 is fixedly connected with the double-column hydraulic arm 12, and the other end is connected with the support frame 4. The worm gear 13 is a second-stage transmission device. When in action, the cast iron pressing head 3 at the front end of the support frame 4 is slightly moved towards the surface of the casting by the extension and contraction of the worm gear 13, until the signal of the front-end limit switch 6 at the cast iron pressing head 3 triggers, and the worm gear 13 stops moving.

[0196] Wherein, the extension and contraction direction of the worm gear 13 is consistent with the extension and contraction direction of the double-column hydraulic arm 12.

[0197] In use, first, the tail direction adjusting support base 11 is adjusted so that the pressing surface of the cast iron pressing head 3 is parallel to the profile of the part to be calibrated of the casting. Then, the double-column hydraulic arm 12 is started to move the pressing surface of the cast iron pressing head 3 towards the profile of the part to be calibrated of the casting. Finally, the worm gear 13 is started to slightly move the pressing surface of the cast iron pressing head 3 towards the profile of the part to be calibrated of the casting, until the signal of the front-end limit switch 6 at the cast iron pressing head 3 triggers, and the worm gear 13 stops moving.

[0198] Embodiment 4

[0199] A thin-wall casting pressing calibration tool, which is different from the tool of embodiment 3 in that:

[0200] The mounting frame 10 is improved. Specifically, the mounting frame 10 includes a vertical support rod 1001, a height-fixed ring 1002 and a casting support beam 1003.

[0201] Wherein, the direction adjusting support base 11 is mounted on the height-fixed ring 1002, and the height-fixed ring 1002 is mounted on the vertical support rod 1001.

[0202] The height of the height fixing ring 1002 on the vertical support rod 1001 is adjustable, and the height fixing ring 1002 can be fixed on the vertical support rod 1001 by rotating the height fixing ring 1002. In this way, the position of the direction adjusting support seat 11 is adjusted by adjusting the position of the height fixing ring 1002 on the vertical support rod 1001, and then the position of the cast iron top pressing head 3 is adjusted.

[0203] The height fixing ring 1002 is provided with a plurality of height fixing rings 1002, which can slide on the vertical support rod 1001, and the height fixing ring 1002 is fixedly connected with the vertical support rod 1001 by a fastening bolt.

[0204] The height fixing ring 1002 can rotate around the vertical support rod 1001, and the height fixing ring 1002 is fixedly connected with the vertical support rod 1001 by a fastening bolt.

[0205] The vertical support rod 1001 is provided with at least five vertical support rods 1001. When the castings are calibrated, four vertical support rods 1001 are distributed outside the castings, and one vertical support rod 1001 is distributed in the inner cavity of the castings. Based on the distribution of the parts to be calibrated, a plurality of height fixing rings 1002 are arranged on the vertical support rod 1001 to realize synchronous calibration of multiple parts to be calibrated of the castings, and when the castings are calibrated, the castings are clamped and fixed by the cast iron top pressing head 3 arranged inside and outside the castings.

[0206] The castings support beam 1003 is provided with at least two castings support beams 1003, wherein the two castings support beams 1003 are distributed above and below, and the castings are fixed between the two castings support beams 1003 during calibration.

[0207] The upper and lower ends of the vertical support rod 1001 are respectively connected with the castings support beam 1003, and the vertical support rod 1001 and the castings support beam 1003 can be tightly connected by a connecting bolt.

[0208] The castings support beam 1003 is in a cross shape, and the vertical support rod 1001 can adjust and fix the position of the castings support beam 1003 at the upper end.

[0209] Embodiment 5

[0210] A thin-walled casting top pressing calibration method, which is different from embodiment 1:

[0211] The position of the support frame 4 is adjusted by the mounting frame 10 and the rear end driving device, and then the position of the cast iron top pressing head 3 is adjusted.

[0212] Specifically, it includes:

[0213] S1: Determine the number and installation position of the vertical support frame 1001 and the height fixing ring 1002;

[0214] Specifically, according to the position of the part to be corrected and the size data of the casting, the number and installation position of the vertical support frame 1001 and the height fixing ring 1002 are adjusted to realize synchronous correction of all deformation parts.

[0215] S2: Use the casting support beam 1003 to fix and clamp the upper and lower ends of the casting;

[0216] Among them, two casting support beams 1003 can be used to squeeze the casting to fix and clamp the casting.

[0217] S3: Adjust the position of the cast iron top pressure head 3 to the casting part to be corrected.

[0218] Specifically, after adjusting the height fixing ring 1102 to the corresponding position, the direction adjusting 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 through the rear end driving device, so that one cast iron top pressure head 3 is arranged at the same deformation part of the inner and outer cavities of the casting, and the positive and negative action force correction is performed.

[0219] Among them, the method for adjusting the position of the cast iron top pressure head 3 through the rear end driving device is as follows:

[0220] S301: Adjust the tail direction adjusting support seat 11, so that the top pressure surface of the cast iron top pressure head 3 is parallel to the type surface of the casting part to be corrected;

[0221] S302: Start the double-column hydraulic arm 12, and move the pressing surface of the cast iron top pressure head 3 to the type surface of the casting part to be corrected;

[0222] Among them, the extension and retraction direction of the double-column hydraulic arm 12 is perpendicular to the pressing surface of the cast iron top pressure head 3.

[0223] Among them, when the front end limit switch on the cast iron top pressure head 3 contacts the type surface of the casting part to be corrected, the double-column hydraulic arm stops extending.

[0224] S303: Start the worm gear 13, and move the top pressure surface of the cast iron top pressure head 3 to the type surface of the casting part to be corrected, until the front end limit switch 6 signal on the cast iron top pressure head 3 triggers, and the worm gear 13 stops moving.

[0225] Example 6

[0226] A thin-walled casting top pressure correction method, which is different from example 1:

[0227] The processing object is different, specifically, the thin-walled casting with irregular cross section, that is, the wall surface of the casting is irregular.

[0228] Specifically, comprising:

[0229] Step 1: based on the absolute deformation of different deformation parts of the casting, a plurality of top pressure correction parts are determined;

[0230] Specifically, comprising:

[0231] S101: Obtain the absolute deformation of different deformation parts of the casting 9;

[0232] Specifically, comprising:

[0233] S1011: scan the casting 9 to obtain a three-dimensional model of the casting;

[0234] Wherein, the casting which is quenched and then subjected to aging treatment is placed on the platform, and the three-dimensional scanner is used to scan the overall contour of the casting to obtain the three-dimensional model of the casting.

[0235] S1012: based on the drawing processing reference, the theoretical model of the casting and the three-dimensional model obtained by scanning are aligned and assembled to measure to obtain the absolute deformation of different deformation parts of the casting.

[0236] S102: taking the deformation part with the largest deformation as the base point, and taking the reinforcing rib closest to the straight line distance of the base point as the origin;

[0237] S103: based on the position of the origin, top pressure correction part arrangement is carried out to obtain a plurality of top pressure correction parts.

[0238] Specifically, as shown in Figure 8 , the top pressure correction point arrangement is carried out according to the distance between adjacent top pressure correction parts not greater than 1 / 8 of the cross-sectional circumference, and the distance between adjacent contour surfaces not greater than 200mm.

[0239] Wherein, the distance between adjacent top pressure correction parts should not be too large, otherwise the possibility of correction rupture will be larger; nor should it be too small, otherwise the arrangement of correction tooling will be troublesome and the data control difficulty will be increased.

[0240] Wherein, the distance between adjacent contour surfaces should not be too large, otherwise it will easily cause torsional deformation; nor should it be too small, otherwise it will increase the workload of scanning analysis data after correction.

[0241] Step 2: set top pressure correction devices at all top pressure correction parts to implement corresponding internal and external top pressure fixation;

[0242] Wherein, the position of the support frame 4 is adjusted by the rear end driving device, so that the pressing surface of the cast iron top pressure head 3 abuts on the surface of the top pressure correction part.

[0243] Specifically, comprising:

[0244] S201: Determine the number and installation position of the vertical support frame 1001 and the height fixing ring 1002;

[0245] Among them, according to the distribution of the top pressure type correction part and the size data of the casting, the number and installation position of the vertical support frame 1001 and the height fixing ring 1002 are adjusted to realize synchronous type correction of all deformation parts.

[0246] S202: Use the casting support beam 1003 to fix and clamp the upper and lower ends of the casting;

[0247] Among them, two casting support beams 1003 can be used to fix and clamp the casting.

[0248] S203: Adjust the position of the cast iron top pressure head 3 based on the determined position of the top pressure type correction part;

[0249] Specifically, after adjusting the height fixing ring 1102 to the corresponding position, the direction adjusting 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 through the rear end driving device, so that one cast iron top pressure head 3 is arranged at the same deformation part of the inner and outer cavities of the casting, and the positive and negative action force top pressure fixing is realized.

[0250] Among them, the method of adjusting the position of the cast iron top pressure head 3 through the rear end driving device is as follows:

[0251] S2031: Adjust the tail direction adjusting support seat 11, so that the top pressure surface of the cast iron top pressure head 3 is parallel to the profile at the top pressure type correction part;

[0252] Among them, the main gear 1101 can be driven manually, when the main gear 1101 is rotated clockwise, the transmission gear 1102 drives the driven gear 1103 to rotate clockwise; when the main gear 1101 is rotated counterclockwise, the transmission gear 1102 drives the driven gear 1103 to rotate counterclockwise.

[0253] Among them, when the main gear 1101 does not rotate, the driven gear 1103 remains in a fixed state, so as to adjust the inclination direction of the double-column hydraulic arm 12, and further adjust the position of the top pressure surface of the cast iron top pressure head 3.

[0254] S2032: Start the double-column hydraulic arm 12, and move the pressing surface of the cast iron top pressure head 3 to the profile at the top pressure type correction part;

[0255] Among them, the extension and retraction direction of the double-column hydraulic arm 12 is perpendicular to the pressing surface of the cast iron top pressure head 3.

[0256] Wherein, when the front end limit switch on the cast iron top pressure head 3 contacts the mold surface at the top pressure calibration position, the double-column hydraulic arm stops forward extension.

[0257] S2033: Start the turbine worm 13, and the top pressure surface of the cast iron top pressure head 3 is slightly moved to the mold surface at the top pressure calibration position until the front end limit switch 6 signal on the cast iron top pressure head 3 triggers, and the worm gear 13 stops moving.

[0258] Step 3: Obtain the absolute deformation of the plurality of top pressure calibration positions, and determine whether the absolute deformation of the top pressure calibration position meets the casting profile requirement;

[0259] Specifically, it includes:

[0260] S301: Label the top pressure calibration position on the three-dimensional model of the casting, and obtain the absolute deformation of the top pressure calibration position;

[0261] Specifically, on the three-dimensional view of the comparison between the casting theoretical model and the scanned three-dimensional model, the corresponding top pressure calibration point is labeled, and the absolute deformation at the corresponding top pressure calibration point is measured and obtained.

[0262] S302: Determine whether the deformation of the top pressure calibration position meets the casting profile requirement;

[0263] Wherein, the profile requirement is determined based on the machining technical requirement, and the absolute deformation greater than 0.5mm range is not in line with the profile requirement.

[0264] The profile requirement is determined based on the machining technical requirement, and the absolute deformation within 0.5mm range is in line with the profile requirement.

[0265] Wherein, for the top pressure calibration position meeting the profile requirement, the inside and outside corresponding top pressure fixation is implemented by using the top pressure calibration device to avoid the distortion of the part.

[0266] Step 4: Use the top pressure calibration device to top pressure calibration at the top pressure calibration point which does not meet the casting profile requirement.

[0267] Specifically, it includes:

[0268] S401: According to the deformation data at the top pressure calibration point, set the heating temperature of the driving part 1 of the top pressure calibration device;

[0269] Specifically, it includes:

[0270] S4011: Based on the absolute deformation ε at the top pressure calibration point and the main body wall thickness value t at the top pressure calibration point, determine the single deformation maximum variable value s at the top pressure calibration point;

[0271] Wherein, the thickness of the top pressure type correction point is detected by using the wall thickness gauge to obtain the wall thickness value t.

[0272] Wherein, based on ε and t, the maximum single deformation variable value s is determined, and the corresponding relationship of s, ε and t is shown in Table 1.

[0273] S4012: Based on ε and s, the feeding amount M of the cast iron top pressure head 3 is obtained, and then the deformation amount L of the driving member 1 is determined;

[0274] Wherein, the feeding amount M of the cast iron top pressure head 3 is the same as the deformation amount L of the driving member 1, and M satisfies:

[0275] M = ε + s Equation (1)

[0276] Wherein, ε is the absolute deformation value of the top pressure type correction point, that is, the deformation value when the casting surface is concave or convex;

[0277] Wherein, s is the maximum single deformation variable value, which is used to overcome the influence of the structure rebound of the casting surface.

[0278] S4013: Based on L, the heating temperature T of the driving member 1 is obtained.

[0279] Wherein, based on the corresponding relationship between the deformation amount and the temperature of the driving 1, the linear regression equation corresponding to the deformation amount and the temperature of the driving member 1 is obtained, as shown in the following formula (2).

[0280] y = 0.8027 * x - 37.156 Equation (2)

[0281] Wherein, y is the dependent variable corresponding to the deformation amount L of the driving member 1, and x is the independent variable corresponding to the temperature T of the driving member 1, wherein the linear relationship between L and T is shown in the attached Figure 4 .

[0282] Wherein, based on the relationship data between the deformation amount and the temperature of the driving member 1 in Table 2, the above formula (2) is obtained, and the relationship data is shown in Table 2.

[0283] Therefore, after obtaining the deformation amount of the top pressure type correction point and the main body wall thickness value of the top pressure type correction point, the maximum single deformation variable value of the top pressure type correction point is obtained based on Table 1, and then the feeding amount of the cast iron top pressure head 3 is obtained based on formula (1), that is, the deformation amount of the driving member 1 is obtained. Finally, the temperature value corresponding to the driving member 1 is obtained based on formula (2), so as to realize the accurate top pressure type correction of the top pressure type correction point by controlling the temperature of the driving member 1.

[0284] S402: The power component of the top pressure type correction device is powered on to the driving member 1, the driving member is deformed to drive the cast iron top pressure head to act on the casting type surface of the type to be corrected, and the rear end temperature measuring thermocouple 8 of the top pressure type correction device is used to detect the temperature of the driving member;

[0285] Wherein, the internal heat source controls the internal driving element 1 to provide the ejection force, or the external heat source controls the external driving element 1 to provide the ejection force, so as to correct the casting.

[0286] Specifically, when the surface of the ejection correction point is convex outward, the cast iron ejection head 3 outside the casting is started to correct the convex ejection correction point, and the cast iron ejection head 3 inside the casting is assisted to extrude at the ejection correction point, so as to avoid the distortion of the area near the ejection correction point.

[0287] When the surface of the ejection correction point is concave inward, the cast iron ejection head 3 inside the casting is started to correct the concave ejection correction point, and the cast iron ejection head 3 outside the casting is assisted to extrude at the ejection correction point, so as to avoid the distortion of the area near the ejection correction point.

[0288] Wherein, the position of the cast iron ejection head 3 is adjusted by the double-column hydraulic arm 12, so as to realize the cast iron ejection head 3 for assisting extrusion at the ejection correction point, which is always extruded at the ejection correction point.

[0289] Wherein, after the driving element 1 is directly current-heated according to the set deformation requirement, the driving element 1 is deformed by heat, the spiral shape is straightened, the transmission element 3 is pushed to move forward, the cast iron ejection head 4 is moved, and then the deformation occurs at the contact part between the casting and the cast iron ejection head 4.

[0290] S403: After the temperature of the driving element 1 reaches the set heating temperature, the temperature is kept, and the current is disconnected after the temperature keeping is finished;

[0291] Specifically, after the temperature of the driving element 1 reaches the set heating temperature, the temperature is kept for 5-10s, and in this time period, the temperature of the driving element is continuously detected by the rear-end temperature measuring thermocouple 8. If the temperature of the driving element 1 reaches the preset value, the circuit is disconnected, the power supply is stopped, and if the temperature of the driving element 1 is lower than the preset value, the circuit is connected. Thus, based on the detection result of the temperature, the repeated connection and disconnection of the power supply circuit are controlled, and the temperature keeping of the driving element 1 is realized.

[0292] In the temperature keeping time period, the cast iron ejection head 3 for assisting extrusion at the ejection correction point is in a fixed state relative to the casting 9.

[0293] S404: The ejection correction point is processed by high-frequency vibration to eliminate the stress at the ejection correction point;

[0294] Specifically, it includes:

[0295] S4041: The ejection correction tool is removed, and the working end of the high-frequency vibration device is contacted with the outer surface of the ejection correction point;

[0296] Wherein, the high-frequency vibration device is a Huayunhaoke energy-vibration stress relief device.

[0297] S4042: starting the high-frequency vibration device;

[0298] Specifically, the vibration frequency is 400-500 Hz, and the vibration time is 20-35 s. In this way, the stress generated at the top pressure correction point after the top pressure correction is eliminated, and the rebound of the part is avoided.

[0299] S4043: After the high-frequency vibration device vibrates at high frequency, the high-frequency vibration device is removed.

[0300] Specifically, after the high-frequency vibration ends, the front end of the high-frequency vibration device is in contact with the outer shape surface at the top pressure correction point for 40-60 s, and then the high-frequency vibration device is removed, so as to further reduce the rebound risk of the part.

[0301] S405: The corrected casting 9 is rechecked until the casting deformation meets the profile requirement.

[0302] Specifically, it includes:

[0303] S4051: The corrected casting is scanned to obtain a three-dimensional model of the corrected casting;

[0304] S4052: The theoretical model of the casting and the obtained three-dimensional model are aligned and assembled to measure the absolute deformation of different deformation parts of the casting;

[0305] S4053: If the deformation of the casting deformation part meets the profile requirement, the casting correction is terminated;

[0306] S4054: If the deformation of the casting deformation part does not meet the profile requirement, return to step 1 until the casting deformation meets the profile requirement.

[0307] Wherein, without disassembling the internal correction tooling, the casting is directly scanned to develop a secondary correction scheme.

[0308] The above method is used to correct the casting, the deformation correction range is 0.1-8 mm, the first correction accuracy can reach 0.1 mm / 40 mm, the overall casting deformation correction qualified rate is improved by 5 times, from 26-30 hours / piece to 4-6 hours / piece, which significantly improves the correction accuracy and efficiency.

[0309] Those skilled in the art can understand that all or part of the processes of the above-mentioned embodiments can be completed by a computer program instructing related hardware, and the program can be stored in a computer readable storage medium. Among them, the computer readable storage medium is a disk, an optical disk, a read-only memory or a random access memory, etc.

[0310] The above merely describes preferred specific embodiments of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A method of flash correction of a thin-walled casting, characterized in that, The method comprises the following steps: Step 1: setting the heating temperature of the driving member of the top pressure shaping device according to the deformation data of the part of the casting to be shaped; the step 1 comprises: S101: obtaining the absolute deformation amount ε of the part of the casting to be shaped; S102: obtaining the main body wall thickness value t of the part of the casting to be shaped; S103: determining the maximum over-deformation value s of single deformation based on ε and t; S104: obtaining the feeding amount M of the cast iron top pressure head based on ε and s, and further determining the deformation amount L of the driving member; S105: obtaining the heating temperature T of the driving member based on L; Step 2: moving the top pressure shaping device to the part to be shaped, so that the cast iron top pressure head of the top pressure shaping device abuts against the part surface of the casting to be shaped; Step 3: passing current to the driving member through the power supply assembly of the top pressure shaping device, so that the driving member deforms to drive the cast iron top pressure head to act on the part surface of the casting to be shaped, and the temperature of the driving member is detected by the rear end temperature measuring thermocouple of the top pressure shaping device; Step 4: after the temperature of the driving member reaches the set heating temperature, heat preservation is carried out, and the current is disconnected after the heat preservation is completed; Step 5: performing high-frequency vibration treatment on the shaped part of the casting to eliminate the stress of the part.

2. The method of claim 1, wherein: In the step S104, The feeding amount M of the cast iron top pressure head is the same as the deformation amount L of the driving member, and M satisfies: M = ε + s.

3. The method of claim 1, wherein: In the step S105, based on the corresponding relationship between the deformation amount L and the temperature T of the driving, a linear regression equation corresponding to the deformation amount L and the temperature T of the driving member is obtained; Wherein, y is the dependent variable, corresponding to the deformation amount L of the driving member, and x is the independent variable, corresponding to the temperature T of the driving member.

4. The method of claim 3, wherein: The linear regression equation is: y = 0.8027 * x - 37.

156.

5. The method of claim 1, wherein: In the step 4, after the temperature of the driving member reaches the set heating temperature, the heat preservation lasts for 5-10s.

6. The method of claim 1, wherein, The step 5 comprises: S501: disassembling the top pressure shaping device, and contacting the working end of the high-frequency vibration device with the outer surface of the shaped part of the casting; S502: starting the high-frequency vibration device; S503: after the high-frequency vibration of the high-frequency vibration device, the high-frequency vibration device is removed.

7. The method of claim 6, wherein: In the step S503, after the high-frequency vibration is completed, the working end of the high-frequency vibration device is in contact with the outer surface of the shaped part of the casting for 40-60s, and then the high-frequency vibration device is removed.

8. A thin-walled casting sizing tool for implementing the method of claim 1, characterized by: The shaping tool comprises a top pressure shaping device and a high-frequency vibration device for eliminating the stress of the local shaped part of the casting, and the top pressure shaping device comprises a driving member, a transmission member, a cast iron top pressure head, a support frame and a heat source, and the heat source, the driving member, the transmission member and the cast iron top pressure head are integrally arranged on the support frame. The heat source controls the deformation of the driving member to extrude the transmission member, and the transmission member drives the cast iron top pressure head to extrude and shape the casting surface.

9. The sizing tool of claim 8, wherein: The deformation state of the driving member is different at different temperatures. The top pressure shaping device further comprises a rear end temperature measuring thermocouple for detecting the temperature of the driving member.

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