An automobile part cold stamping detection forming system

Abstract

The application relates to an automobile part cold stamping detection forming system, which comprises a lower die, a plurality of pressure measurement micro-holes being arranged at the corner of a special-shaped part, a pressurizing mechanism arranged outside the lower die and used for feeding pressurized gas into the pressure measurement micro-holes, and a gas pressure sensor used for detecting the gas pressure change; a punching die; a shaping die; a plurality of distance adjusting mechanisms, which have a first stroke, a second stroke and an additional stroke, in the first stroke, a punching head can punch through the shaping die, in the second stroke, the punching head does not completely pass through the shaping die, and a shaping controller is configured to: when the gas pressure change detected by any gas pressure sensor exceeds a preset value, control all distance adjusting mechanisms to be adjusted to the second stroke and control the corresponding distance adjusting mechanism to be adjusted to the additional stroke, and then slowly recover to the second stroke. The application can automatically detect the gap defect of the special-shaped part of the stamping part, and control the shaping die to be slightly inclined for secondary shaping, so that the springback phenomenon of the special-shaped part of the stamping part is improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of metal stamping processing, and in particular to an automobile part cold stamping detection forming system. BACKGROUND

[0002] Cold stamping is a kind of pressure processing method that uses a stamping die to apply pressure on a plate or hot material on a press machine at room temperature to make it produce plastic deformation or separation, so as to obtain a part with a required shape and size. The cold stamping process has the advantages of high production efficiency, low manufacturing cost, high material utilization rate, good part size precision and surface quality, and is widely used in the fields of automobiles, electronics, home appliances, aerospace, etc.

[0003] In the related art, a Chinese patent application with the application number CN202110863837.9 proposes an automobile body part cold stamping die, which comprises a supporting bottom plate, a clamping assembly and a punching assembly. The clamping assembly and the punching assembly are arranged in sequence from left to right on the upper end face of the supporting bottom plate. The punching assembly comprises a fixed edge plate, a punching cylinder, a linkage plate, a punching punch, a cooling plate, a water pipe, a driving motor, a rotating rod and a rotating worm gear. The fixed edge plate is fixedly installed on the right end face of the supporting bottom plate. The punching cylinder is fixedly installed on the right end face of the fixed edge plate. The output shaft of the punching cylinder is fixedly installed with the linkage plate, which is located on the left side of the fixed edge plate. The linkage plate is uniformly installed with the punching punch from front to back on the left end face. When the automobile body part is punched, the flow of cooling water in the cooling plate can reduce the temperature of the surface of the automobile body part, thereby accelerating the heat dissipation efficiency of the automobile body part.

[0004] However, in the automobile manufacturing process, the metal plate needs to be stamped into a part with multiple recesses and protrusions to adapt to the assembly of the whole vehicle. In addition, punching is usually required in the recess or protrusion part. However, when the metal plate is stretched at the corner of the special-shaped part, stress concentration is easy to occur, which may cause rupture or wrinkling. Even if the segmented stamping process is used for multiple shallow stretching of the special-shaped part, the possibility of springback at the corner of the special-shaped part still exists before punching, which may cause precision deviation of the punching hole. SUMMARY

[0005] In order to improve the problem that the stamping part is easy to have springback gap at the corner of the special-shaped part before punching, which may cause precision deviation of the punching, the application provides an automobile part cold stamping detection forming system.

[0006] The automobile part cold stamping detection forming system provided by the application adopts the following technical scheme:

[0007] An automobile part cold stamping detection forming system comprises:

[0008] a lower die, which is provided with a plurality of pressure measuring micro-holes at the corners of corresponding irregular parts, and a pressurizing mechanism and a gas pressure sensor for detecting the change of gas pressure, which are arranged outside the lower die and used to pass pressurized gas into the pressure measuring micro-holes after the stamping part is attached to the lower die, and at least one pressurizing mechanism corresponding to one irregular part of the stamping part;

[0009] a punching die, which is arranged above the lower die and provided with a punching head;

[0010] a shaping die, which is connected to the lower end surface of the punching die and used to pre-shape the stamping part in the lower die;

[0011] a distance adjusting mechanism, which is arranged between the punching die and the shaping die and distributed in the form of an equidistant circumferential array, and has a first stroke, a second stroke and an additional stroke above the second stroke, wherein the punching head can pass through the shaping die for punching in the first stroke, the punching head does not completely pass through the shaping die in the second stroke, and

[0012] a shaping controller, which is configured to control all the distance adjusting mechanisms to adjust to the second stroke and control the distance adjusting mechanisms in the corresponding area to adjust to the additional stroke when the change of gas pressure detected by any of the gas pressure sensors exceeds a preset value, and gently recover to the second stroke when the punching die and the shaping die are locally in close contact.

[0013] Further, the pressurizing mechanism comprises:

[0014] a branch gas pipe, which is in communication with the pressure measuring micro-hole;

[0015] a main gas pipe, which is in communication with all or some of the branch gas pipes corresponding to one irregular part, and one irregular part corresponds to one or more main gas pipes;

[0016] a pressurizing cabin, one end of which is in communication with the main gas pipe and the other end of which is connected with a gas delivery pipe in communication with an external high-pressure gas source;

[0017] a pressure regulating valve, which is arranged on the gas delivery pipe; and

[0018] a pressure release valve, which is arranged on the main gas pipe;

[0019] the gas pressure sensor is used to detect the gas pressure in the pressurizing cabin and is electrically connected with the shaping controller.

[0020] Further, before detecting the change of gas pressure after the stamping part is attached to the lower die, the gas pressure sensor first blocks all the pressure measuring micro-holes corresponding thereto, and detects a gas pressure change reference value when the pressure release valve is opened at a set gas pressure in the pressurizing cabin, and the part exceeding the gas pressure change reference value is taken as the gas pressure change value after the stamping part is attached to the lower die.

[0021] Further, a plane coordinate system is established with the center of the circumference of the plurality of distance adjusting mechanisms as the origin, and the distance adjusting coordinates of each distance adjusting mechanism and the positioning coordinates of the center point of each profiled part on the stamping part are calibrated;

[0022] The shape correcting controller is configured to: according to the positioning coordinates of the profiled part corresponding to the air pressure sensor that detects that the air pressure change value exceeds the preset value, select two distance adjusting mechanisms corresponding to two distance adjusting coordinates with the shortest straight line distance therefrom and control the operation thereof.

[0023] Further, the shape correcting controller is further configured to: the shorter the straight line distance between the distance adjusting coordinates of the selected two distance adjusting mechanisms and the positioning coordinates, the greater the additional stroke of the corresponding distance adjusting mechanism.

[0024] Further, the shaping die is provided with an electronic level at the origin of the plane coordinate system, and the electronic level is connected to a limited angle controller, and the plurality of distance adjusting mechanisms are connected to the limited angle controller.

[0025] The limited angle controller is configured to: when the electronic level detects that the inclination angle of the shaping die is equal to the limit value of the preset inclination angle range, control the distance adjusting mechanism in the additional stroke to reduce the stroke.

[0026] Further, the distance adjusting mechanism comprises:

[0027] An inner screw cylinder is rotationally arranged on one of the piercing die and the shaping die;

[0028] An adjusting screw rod is threadedly connected to the inner screw cylinder at one end and corresponds to the other one of the shaping die and the piercing die at the other end;

[0029] A rotation prevention rod is arranged through the end of the adjusting screw rod extending into the inner screw cylinder; and

[0030] A self-locking type driving assembly is used to drive the rotation of the inner screw cylinder and is electrically connected to the shape correcting controller.

[0031] Further, a plurality of vertically arranged guide rods are fixedly connected to the upper end surface of the shaping die, the upper ends of the guide rods penetrate the piercing die and extend above the piercing die, and anti-disengagement blocks are fixedly connected to the upper end surfaces of the guide rods;

[0032] A ball seat is mounted on the piercing die, a ball head is rotationally arranged in the ball seat, a through hole is formed through the ball head in the radial direction thereof, and the guide rods are arranged through the through hole.

[0033] Further, a compression spring is sleeved on the circumferential side of the guide rod between the shaping die and the piercing die, and the compression limit total length of the compression spring is less than the compressible minimum distance between the shaping die and the piercing die.

[0034] Further, the self-locking type driving assembly comprises:

[0035] a worm wheel coaxially fixed to the outer wall of the inner screw cylinder;

[0036] a worm rod engaged with the worm wheel; and

[0037] a servo motor for driving the worm rod to rotate and electrically connected with the shape correcting controller.

[0038] In summary, the beneficial technical effects of the present application are:

[0039] 1. By delivering the set pressure gas in the pressure chamber to the gap between the corner of the profiled part and the lower die through the pressure measuring micro-pore, and then detecting the fit clearance of the profiled part at the corner by the air pressure sensor, if the detected clearance is good, all the distance adjusting mechanisms are kept at the first stroke, and the punching die is controlled to continue to press down to complete the punching; if the detected clearance is poor, all the distance adjusting mechanisms are adjusted to the second stroke, and the distance adjusting mechanism closest to the profiled part of the profiled part with poor clearance is continuously adjusted to the additional stroke, so that the punching die can continue to move downward to push the shaping die to a certain micro-inclined posture to perform secondary shaping on the profiled part on the lower die, which can improve the poor clearance of the profiled part and reduce the rebound probability of the profiled part corner;

[0040] 2. By gradually pressing the punching die and the shaping die through the plurality of distance adjusting mechanisms, the distance adjusting mechanism in the additional stroke slowly recovers to the second stroke, at this time, the part corresponding to the corner of the profiled part of the profiled part on the shaping die first contacts the part with poor clearance of the profiled part, and then the ball hinge elastic connection of the shaping die on the punching die can make the shaping die slowly deflect back to normal compared to the lower die with the contact part as the fulcrum, forming a rolling effect on the contact part; finally, when the total stroke of all the distance adjusting mechanisms is consistent, the shaping die and the punching die are in parallel state, the shaping die completely presses the profiled part on the lower die to ensure the shaping effect of the shaping die on the profiled part as a whole, avoiding the profiled part with poor clearance being excessively extruded to cause abnormal wall thickness; then the punching die is lifted to the set height, all the distance adjusting mechanisms recover to the first stroke, and the shaping die does not separate from the profiled part on the upper die, and the punching die can complete the punching operation again, which can effectively reduce the probability of rebound clearance at the corner of the profiled part, and can ensure the punching quality and precision of the punching on the profiled part;

[0041] 3. The servo motor drives the worm gear structure transmission, and the inner screw cylinder rotates. By adjusting the speed of the servo motor, the distance adjusting mechanism can quickly adjust between the first stroke and the second stroke, and slowly and accurately adjust when entering the additional stroke, which can effectively control the length of the stamping beat; the meshing structure of the worm gear and the worm has self-locking property, and the screw connection structure of the adjusting screw and the inner screw cylinder also has self-locking property, so when the distance adjusting mechanism is adjusted to the corresponding stroke, it will not change state due to the impact between the punching die and the forming die, effectively ensuring the adjustment accuracy of the distance adjusting mechanism;

[0042] 4. By establishing a plane coordinate system and calibrating the distance adjusting coordinates corresponding to each distance adjusting mechanism and the positioning coordinates corresponding to the center point of each special-shaped part on the stamping part, the two distance adjusting mechanisms closest to the special-shaped part on the stamping part can be more intuitively determined, and the corner of the gap defect of the special-shaped part of the stamping part can be more comprehensively and accurately stamped; further limited to the shorter the straight line distance between the distance adjusting coordinates and the positioning coordinates, the larger the additional stroke of the corresponding distance adjusting mechanism, which can further improve the matching degree of the impact energy diffusion range of the punching die impacting the forming die and the corner of the gap defect of the special-shaped part of the stamping part, and ensure the secondary stamping and straightening effect of the forming die on the stamping part;

[0043] 5. The application detects the gap condition of the special-shaped part of the stamping part through the air pressure sensor, automatically determines by the straightening controller, and controls multiple distance adjusting mechanisms to adjust to the first stroke, the second stroke or the third stroke, to selectively process the stamping part, realizing automatic detection and automatic secondary shaping stamping or automatic punching when punching the special-shaped part prone to springback of the stamping part, without the intervention of the operator, and the operation is timely, time-consuming and efficient, and is suitable for processing most sheet materials. BRIEF DESCRIPTION OF DRAWINGS

[0044] Figure 1 is the overall structure of the embodiment of the application;

[0045] Figure 2 is the cross-sectional view of the embodiment of the application when the distance adjusting mechanism is in the second stroke;

[0046] Figure 3 is the cross-sectional view of the embodiment of the application when the distance adjusting mechanism is in the first stroke;

[0047] Figure 4 is Figure 1 the local enlarged view of part A in

[0048] Figure 5 is Figure 1 the local enlarged view of part B in

[0049] Figure 6 is Figure 1A local enlarged view of the middle C part.

[0050] Legend of reference signs:

[0051] 1, lower die; 11, pressure measuring micro hole;

[0052] 2, piercing die; 21, piercing head;

[0053] 3, sizing die; 31, electronic level;

[0054] 41, bronchus; 42, trachea; 43, pressurized cabin; 44, pressure regulating valve; 45, pressure relief valve; 46, air pressure sensor; 47, air supply pipe;

[0055] 5, distance adjusting mechanism; 51, inner screw cylinder; 52, adjusting screw; 53, anti-rotation rod; 54, pressure equalizing block;

[0056] 61, guide rod; 62, anti-falling block; 63, ball seat; 64, ball head; 641, through hole; 65, compression spring;

[0057] 71, worm gear; 72, worm; 73, servo motor;

[0058] 8, punched part; 81, special-shaped part. DETAILED DESCRIPTION

[0059] The technical solutions of the present application will be described clearly and completely below with reference to the drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0060] The embodiments of the present application disclose a cold stamping detection forming system for automobile parts. With reference to the drawings, Figure 1 , Figure 2 and Figure 3 , which comprise:

[0061] The lower die 1 has an opening part in the shape of an expanding pipe, and a plurality of pressure measuring micro holes 11 are arranged at the corner of the special-shaped part 81 of the punched part 8. Specifically, if the special-shaped part 81 is a recessed part, the pressure measuring micro holes 11 are arranged at the corner of the groove bottom wall of the recessed part; if the special-shaped part 81 is a protruding part, the pressure measuring micro holes 11 are arranged at the corner of the root of the protruding part. A pressurizing mechanism for passing pressurized gas into the pressure measuring micro holes 11 after the punched part 8 is attached to the lower die 1 and an air pressure sensor 46 for detecting the change of air pressure are arranged outside the lower die 1. One air pressure sensor 46 corresponds to at least one special-shaped part 81 in the punched part 8. The air pressure sensor 46 can be used to detect the change of air pressure value or the rate of air pressure change, such as the air pressure change value per unit time. Common air pressure detectors can be usually selected.

[0062] The punch die 2 is arranged above the lower die 1 and has a punch head 21 thereon. According to different stamping processes, the punch die 2 can be a magnetic force driving stamping or an oil cylinder driving stamping.

[0063] The sizing die 3 is elastically connected to the punch die 2 below and is used for pre-sizing the stamped part 8 in the lower die 1. The sizing die 3 has a through hole for the punch head 21 to pass through, so that when the punch die 2 continues to move downward after the sizing die 3 pre-presses the stamped part 8 in the lower die 1, the punch head 21 can pass through the through hole and punch the stamped part 8. The size of the through hole is larger than that of the punch head 21, so as to prevent the sizing die 3 from being stuck when it is slightly inclined.

[0064] The distance adjusting mechanism 5 is arranged between the punch die 2 and the sizing die 3 and is distributed in the form of an equidistant circumferential array. The distance adjusting mechanism 5 has a first stroke, a second stroke, and an additional stroke above the second stroke. When the distance adjusting mechanism 5 is in the first stroke, the punch head 21 can pass through the sizing die 3 to punch. When the distance adjusting mechanism 5 is in the second stroke, the punch head 21 does not completely pass through the sizing die 3. When not all distance adjusting mechanisms 5 are in the same additional stroke, the sizing die 3 is in a slightly inclined state compared to the punch die 2, and the limit value of the slight inclination angle of the sizing die 3 is ±0.5° to ±1°. Specifically, the central axis is determined according to the shape profile of the stamped part 8, and the distance adjusting mechanisms 5 are distributed in the form of an equidistant circumferential array around the central axis. In this embodiment, the distance adjusting mechanism 5 is provided with four. The second stroke is larger than the first stroke, and the additional stroke is an additional stroke based on the second stroke.

[0065] The sizing controller is configured to: when the air pressure change detected by any air pressure sensor 46 exceeds a preset value, control all distance adjusting mechanisms 5 to adjust to the second stroke and control the distance adjusting mechanism 5 in the area corresponding to the air pressure sensor 46 to adjust to the additional stroke, and slowly recover to the second stroke after the punch die 2 and the sizing die 3 are tightly pressed. Specifically, in the initial state, the sizing die 3 and the punch die 2 are not in contact with the distance adjusting mechanism 5. When the sizing die 3 presses the stamped part 8 in the lower die 1, the distance adjusting mechanism 5 is in contact with the sizing die 3 and the stamping die at the same time as the punch die 2 continues to press downward.

[0066] Referring to Figure 1 and Figure 4 The pressurizing mechanism comprises:

[0067] The bronchus 41 is in communication with the pressure measuring micro-hole 11.

[0068] The total trachea 42 is communicated with all or some of the branch tracheas 41 corresponding to the one irregular part 81, and the one irregular part 81 corresponds to one or more total tracheas 42. In the specific setting, the total trachea 42 is configured according to the size of the irregular part 81 on the stamping part 8. If the size of the irregular part 81 is large, the irregular part 81 corresponds to two or more total tracheas 42. If the size of the irregular part 81 is small, the irregular part 81 corresponds to one total trachea 42. In the embodiment, one irregular part 81 corresponds to one total trachea 42.

[0069] The pressurized cabin 43 is communicated with the total trachea 42 at one end and connected with the gas conveying pipe 47 communicated with the external high-pressure gas source at the other end.

[0070] The pressure regulating valve 44 is arranged on the gas conveying pipe 47, which can be an electromagnetic valve.

[0071] The pressure releasing valve 45 is arranged on the total trachea 42, which can be an electromagnetic valve.

[0072] The aforementioned gas pressure sensor 46 is used to detect the gas pressure size or change rate in the pressurized cabin 43 and is electrically connected with the shape correcting controller.

[0073] Further, before the gas pressure sensor 46 detects the gas pressure change after the stamping part 8 is attached to the lower mold 1, all the pressure measuring micro-holes 11 corresponding to the gas pressure sensor 46 are blocked, and the gas pressure change reference value of the pressurized cabin 43 when the pressure releasing valve 45 is opened at the set gas pressure is detected. The part exceeding the gas pressure change reference value is taken as the gas pressure change value after the stamping part 8 is attached to the lower mold 1. That is, the pressure drop interference caused by the inflation in the total trachea 42 and the branch tracheas 41 is excluded, and the gas pressure change detected by the gas pressure sensor 46 is more accurate.

[0074] Therefore, when the stamping part 8 after being segmented and stamped for many times is transferred to the lower mold 1 to prepare for punching, the punching mold 2 is first driven to move downward to the shaping mold 3 to press the stamping part 8 tightly in the lower mold 1, so that the corners of each irregular part 81 on the stamping part 8 are closely attached to the lower mold 1 in theory. At the same time, the pressure releasing valve 45 is closed, and the pressurized cabin 43 is filled with compressed gas through the gas conveying pipe 47. The gas pressure sensor 46 detects the gas pressure in the pressurized cabin 43 in real time until the set value, such as 0.3-0.5 MPa, is reached, and the pressure regulating valve 44 is closed. Then, when the stamping part 8 is pressed by the shaping mold 3, the pressure regulating valve 44 is opened. The set gas pressure value of the pressurized cabin 43 is flowed to the gap between the corners of the stamping part 8 and the corresponding parts of the lower mold 1 through the total trachea 42, the branch tracheas 41 and the corresponding pressure measuring micro-holes 11. If the attachment gap between the corners of the stamping part 8 and the lower mold 1 is within the set value range, the pressure loss value detected by the gas pressure sensor 46 is within the allowable range, and it is determined that the stamping part 8 has a good gap at the corner and can be punched. At this time, all the distance adjusting mechanisms 5 are maintained at the first stroke, as shown in FIG. 6, and the punching mold 2 can continue to move downward to complete the punching work. Figure 3 ​

[0075] If the gap between the stamped part 8 and the lower die 1 at the corner exceeds the set value, the pressure sensor 46 detects a pressure loss value exceeding the set value. This indicates that the gap at the corner of the stamped part 8 is poor and cannot be directly punched. The straightening controller controls all adjusting mechanisms 5 to adjust to the second stroke so that when the punching die 2 moves downward, it can press against the shaping die 3 but will not perform the punching operation. Figure 2 As shown, the straightening controller continues to control the adjusting mechanism 5 closest to the irregular part 81 on the stamping part 8 corresponding to the air pressure sensor 46 to continue adjusting to the additional stroke, so that when the punching die 2 continues to move down, it can push the shaping die 3 to perform secondary shaping on the stamping part 8 on the lower die 1 with a certain slightly tilted posture. Moreover, since the adjusting mechanism 5 closest to the irregular part 81 of the stamping part 8 with poor clearance has the largest overall stroke, the impact energy of the punching die 2 is first transferred from this part to the shaping die 3 elastically connected to it, which can improve the poor clearance of the irregular part 81 at this point and reduce the probability of the irregular part 81 springing back at the corner.

[0076] Simultaneously, as the punching die 2 and the shaping die 3 are gradually pressed together by multiple adjusting mechanisms 5, the adjusting mechanism 5, which is in the additional stroke, slowly returns to the second stroke. At this time, the part of the shaping die 3 corresponding to the corner of the irregular part of the stamped part 8 first contacts the area with poor clearance of the irregular part of the stamped part 8. Then, with the elastic connection of the ball joint of the shaping die 3 on the punching die 2 and the flared setting of the lower die 1, the shaping die 3 can form a certain elastic avoidance effect in the lower die 1 to prevent the two from jamming. At the same time, the shaping die 3 can slowly deflect back to the center relative to the lower die 1 with the contact part as the fulcrum, forming a certain elastic avoidance effect on the contact part. The rolling effect; due to the buffering effect of the elastic connection between the shaping die 3 and the punching die 2, the stamped part in a certain area will not be over-punched and cause new quality defects; finally, when the total stroke of all the adjusting mechanisms 5 is consistent, the shaping die 3 and the punching die 2 are kept in parallel. The shaping die 3 completely presses the stamped part 8 onto the lower die 1 to ensure the shaping effect of the shaping die 3 on the overall stamped part 8, and avoid the abnormal wall thickness caused by the excessive compression of the irregular part 81 of the stamped part 8 with poor gap; optimally, after the shaping die 3 is leveled, the pressure should be held for 2 to 3 seconds to further suppress the springback of the corner of the irregular part 81.

[0077] Then the punching die 2 is raised to the set height, and all the adjusting mechanisms 5 are restored to the first stroke. The shaping die 3 does not detach from the stamping part 8 on the upper die. The punching die 2 is pressed down again to complete the punching operation. This can effectively reduce the probability of springback gap at the corner of the irregular part 81 of the stamping part 8, and ensure the punching quality and accuracy of punching on the irregular part 81 of the stamping part 8.

[0078] Wherein, in order to ensure the punching efficiency of the stamping part 8, the pressure regulating valve 44 is opened to make the external compressed gas enter the pressurizing cabin 43 and adjust the air pressure in the pressurizing cabin 43 to the preset value after each stamping operation is completed. Moreover, since the pressure regulating valve 44 and the pressure releasing valve 45 are both electromagnetic valves, they can be controlled by the central controller, and similarly, the driving member for controlling the lifting of the punching die 2 can also be controlled by the central controller, so as to realize the automatic operation of the pressurizing mechanism and the punching operation.

[0079] And in order to ensure that the distance adjusting mechanism 5 can withstand the impact of the punching die 2 on the shaping die 3 and quickly control the distance adjusting mechanism 5 to adjust to the first stroke or the second stroke or the additional stroke.

[0080] In a feasible embodiment, referring to Figure 1 and Figure 5 , the distance adjusting mechanism 5 comprises:

[0081] The inner sleeve 51 is rotatably arranged on one of the punching die 2 and the shaping die 3, and in this embodiment, the inner sleeve 51 is rotatably arranged on the lower end surface of the punching die 2;

[0082] The adjusting screw 52 is threadedly connected to the inner sleeve 51 at one end and corresponds to the other one of the shaping die 3 and the punching die 2 at the other end, and in this embodiment, the lower end of the adjusting screw 52 corresponds to the shaping die 3, and if necessary, a pressure equalizing block 54 can also be installed on the lower end of the adjusting screw 52 to reduce the damage caused by the impact of the punching die 2 on the shaping die 3;

[0083] The anti-rotation rod 53 is arranged through the end of the adjusting screw 52 extending into the inner sleeve 51, and specifically, the anti-rotation rod 53 is a square rod or a hexagonal rod or an equilateral triangular rod with rounded corners at the corners, and the anti-rotation rod 53 is fixedly connected to the lower end surface of the punching die 2 and centrally located in the inner sleeve 51; and

[0084] The self-locking type driving assembly is used to drive the rotation of the inner sleeve 51 and is electrically connected with the shaping controller. Specifically, it can be a combination of a worm gear 71 and a worm 72, such as coaxially fixing the worm gear 71 on the outer wall of the inner sleeve 51, rotatably arranging the worm 72 on the lower end surface of the punching die 2 and making the worm 72 mesh with the worm gear 71, and then installing a servo motor 73 for driving the rotation of the worm 72 on the lower end surface of the punching die 2, and the rotation speed of the servo motor 73 is adjustable, so as to facilitate the quick adjustment of the distance adjusting mechanism 5 between the first stroke and the second stroke, and slow and accurate adjustment when entering the additional stroke, which can effectively control the length of the stamping beat.

[0085] Therefore, when the servo motor 73 is started, the servo motor 73 drives the worm 72 to rotate, and drives the worm gear 71 engaged with the worm 72 to rotate, and further drives the inner screw cylinder 51 to rotate. Since the anti-rotation rod 53 limits the rotation of the adjusting screw 52, the adjusting screw 52 can move axially along the inner screw cylinder 51 to change the overall length of the distance adjusting mechanism 5, so that the distance adjusting mechanism 5 can be switched between the first stroke, the second stroke and the additional stroke. Since the engagement structure of the worm gear 71 and the worm 72 has self-locking property, and the screwing structure of the adjusting screw 52 and the inner screw cylinder 51 also has self-locking property, when the distance adjusting mechanism 5 is adjusted to the corresponding stroke, the state will not be changed due to the impact between the punching die 2 and the forming die, effectively ensuring the adjustment accuracy of the distance adjusting mechanism 5.

[0086] In another possible embodiment, the distance adjusting mechanism 5 comprises:

[0087] a cam, which is rotationally arranged on one of the punching die 2 and the forming die 3, for example, rotationally arranged on the lower end surface of the punching die 2;

[0088] a self-locking type driving assembly for driving the cam to rotate, which is electrically connected with the shape correcting controller, and the specific structure thereof can be consistent with the self-locking type driving assembly described above, or can be any driving structure that can drive the cam to rotate and keep the cam in a locked state after rotation.

[0089] Therefore, by driving the cam to rotate through the self-locking type driving assembly, when the short shaft end of the cam is aligned with the forming die 3, the distance adjusting mechanism 5 is in the first stroke; when the long shaft end of the cam is aligned with the forming die 3, the distance adjusting mechanism 5 is in the maximum limit stroke in the additional stroke; when the arc surface of the cam close to the long shaft end is aligned with the forming die 3, the distance adjusting mechanism 5 is in the second stroke. In this way, the convenient switching of the distance adjusting mechanism 5 between the first stroke, the second stroke and the additional stroke can also be achieved.

[0090] Alternatively, in other possible embodiments, the cam described above is arranged to have two cam portions with different heights, a short cam portion for corresponding to the second stroke and a long cam portion for corresponding to the maximum limit stroke in the additional stroke, so that the impact of the punching die 2 on the forming die 3 can be effectively transmitted to the rotation shaft of the cam, and the locking requirement of the self-locking type driving assembly can also be reduced to a certain extent.

[0091] Further, in order to enable the shape correcting controller to more accurately control the corresponding distance adjusting mechanism 5, in a possible embodiment, a plane coordinate system is established with the circumferential distribution center of the plurality of distance adjusting mechanisms 5 as the origin, and the distance adjusting coordinates of each distance adjusting mechanism 5 and the positioning coordinates of the center points of each profiled portion 81 on the stamping part 8 are calibrated. The points not on the plane coordinate system are marked with the projection coordinates on the plane of the coordinate system, and in this embodiment, the four distance adjusting mechanisms 5 are arranged on the four coordinate axes of the plane coordinate system, respectively.

[0092] The shape correcting controller is configured to: according to the positioning coordinates of the profiled part 81 corresponding to the air pressure sensor 46 detecting that the air pressure change value exceeds the preset value, select the two distance adjusting mechanisms 5 corresponding to the two distance adjusting coordinates with the shortest straight line distance and control the operation thereof. After the punching die 2 impacts the sizing die 3, the profiled part 81 corner of the gap defective stamping part 8 can be more comprehensively and accurately stamped and corrected.

[0093] Further, in the selected two distance adjusting mechanisms 5, the shorter the straight line distance between the distance adjusting coordinates and the positioning coordinates, the greater the additional stroke of the control corresponding distance adjusting mechanism 5 adjustment. The impact energy diffusion range of the punching die 2 impacting the sizing die 3 and the fit degree of the profiled part 81 corner of the gap defective stamping part 8 can be further improved, and the secondary stamping and correcting effect of the sizing die 3 on the stamping part 8 is ensured.

[0094] In addition, referring to Figure 1 and Figure 2 , the sizing die 3 is provided with an electronic level 31 at the origin of the plane coordinate system, and the electronic level 31 is specifically installed at the central part of the upper end face of the sizing die 3. The electronic level 31 is connected to a limited angle controller, and the plurality of distance adjusting mechanisms 5 are connected to the limited angle controller.

[0095] The limited angle control is configured to: when the electronic level 31 detects that the inclination angle of the sizing die 3 is equal to the limit value of the preset inclination angle range, such as ±0.5° or ±1°, control the distance adjusting mechanism 5 in the additional stroke to reduce the stroke, but not less than the second stroke.

[0096] Therefore, when the sizing die 3 is attached to the stamping part 8, the distance adjusting mechanisms 5 with different stroke heights make the sizing die 3 gradually assume a slight inclination posture during the process of the punching die 2 impacting the sizing die 3, so that the impact energy of the punching die 2 is partially released to the profiled part 81 with a gap defect of the stamping part 8; and if the electronic level 31 detects that the inclination angle of the sizing die 3 is too large, the sizing die 3 will be stuck with the lower die 1 provided with the flaring, or the punching die 2 will completely impact the sizing die 3, which will cause the wall thickness of the profiled part 81 with a gap defect of the corresponding stamping part 8 to be too thin or broken. After this limitation, the posture of the sizing die 3 can be adjusted and corrected in real time during the process of the punching die 2 continuously moving downward to impact the sizing die 3, so as to improve the stamping defects caused by the above-mentioned situation.

[0097] In addition, in order to realize the micro-inclination active connection between the sizing die 3 and the punching die 2.

[0098] Referring to Figure 1 and Figure 6 , a plurality of vertically arranged guide rods 61 are fixedly connected to the upper end face of the sizing die 3, the upper ends of the guide rods 61 penetrate through the punching die 2 and extend above the punching die 2, and anti-disengagement blocks 62 are fixedly connected to the upper end faces of the guide rods 61;

[0099] The punch die 2 is provided with a ball seat 63, and a ball head 64 is rotatably arranged in the ball seat 63. A through hole 641 is formed in the ball head 64 along a radial direction of the ball head 64. The guide rod 61 is arranged in the through hole 641.

[0100] The guide rod 61 is sleeved with a compression spring 65 between the sizing die 3 and the punch die 2. A compression limit length of the compression spring 65 is less than a first stroke of the distance adjusting mechanism 5. That is, the punch die 2 is in a hard contact state with the sizing die 3 when the punch die 2 performs a punching operation, so that flexible contact of the compression spring 65 can be avoided to interfere with a stamping quality. The sizing die 3 is in a flexible contact state with the lower die 1. By arranging the compression spring 65, the sizing die 3 can be prevented from affecting a wall thickness stability of the stamping part when the sizing die 3 corrects a local springback of the stamping part in a slightly inclined posture.

[0101] Therefore, the guide rod 61 of the sizing die 3 passes through the ball head 64 of the punch die 2, so that the sizing die 3 can be kept in an effective active connection with the punch die 2 and can be in a slightly inclined posture compared with the punch die 2, thereby facilitating secondary stamping and correcting of a corner of the abnormal-shaped part 81 of the stamping part 8.

[0102] Unless otherwise defined, technical terms or scientific terms used in the present application shall have the common meaning understood by one of ordinary skill in the art to which the present application pertains. The words "first", "second", "third", and the like used in the specification and claims of the present application do not denote any order, quantity, or importance, but are used to distinguish different components. The words "one" or "a" or the like do not denote a quantity restriction, but mean that there is at least one. The words "include" or "contain" or the like mean that the elements or objects before the words "include" or "contain" cover the elements or objects listed after the words "include" or "contain" and their equivalents, and do not exclude other elements or objects. The words "upper", "lower", "left", "right", and the like are used to represent relative positional relationships, and when the absolute positions of the described objects are changed, the relative positional relationships may also be changed accordingly.

[0103] The above are preferred embodiments of the present application, which do not limit the protection scope of the present application. Any equivalent changes made according to the structure, shape, and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. An automotive part cold-stamping detection forming system, characterized by, The application relates to a stamping device and a method for controlling the stamping device. The stamping device comprises: a lower die provided with a plurality of pressure-measuring micro-holes corresponding to the corners of the profiled part; a pressurizing mechanism arranged outside the lower die and used for introducing pressurized gas into the pressure-measuring micro-holes after the profiled part is attached to the lower die, and a gas pressure sensor used for detecting the gas pressure change; a punch die arranged above the lower die and provided with a punch head; a shaping die connected to the lower end surface of the punch die and used for pre-shaping the profiled part in the lower die; a distance adjusting mechanism arranged between the punch die and the shaping die and provided with a plurality of adjusting mechanisms arranged in an equidistant circumferential array, the distance adjusting mechanism having a first stroke, a second stroke and an additional stroke above the second stroke, the punch head being capable of punching through the shaping die in the first stroke, and the punch head not completely penetrating the shaping die in the second stroke; and 2. The cold-stamping inspection system for automotive parts according to claim 1, wherein a shape correcting controller configured to control all the distance adjusting mechanisms to adjust to the second stroke and control the distance adjusting mechanisms in the corresponding regions to adjust to the additional stroke when the gas pressure change detected by any of the gas pressure sensors exceeds a preset value, and to gently return to the second stroke when the punch die and the shaping die are locally in close contact. The pressurizing mechanism comprises: a branch gas pipe in communication with the pressure-measuring micro-holes; a main gas pipe in communication with all or some of the branch gas pipes corresponding to one profiled part, one profiled part corresponding to one or more main gas pipes; a pressurizing cabin having one end in communication with the main gas pipe and the other end connected with a gas conveying pipe in communication with an external high-pressure gas source; a pressure regulating valve arranged on the gas conveying pipe; and a pressure releasing valve arranged on the main gas pipe.

3. The cold-stamping inspection system of claim 2, wherein: The gas pressure sensor is used for detecting the gas pressure in the pressurizing cabin and is electrically connected with the shape correcting controller.

4. The cold-stamping inspection and forming system for automotive parts of claim 1, wherein Before detecting the gas pressure change of the profiled part after the profiled part is attached to the lower die, all the pressure-measuring micro-holes corresponding to the profiled part are blocked, and the gas pressure change reference value of the gas pressure in the pressurizing cabin when the pressure releasing valve is opened at a set gas pressure is detected, and the part exceeding the gas pressure change reference value is taken as the gas pressure change value of the profiled part after the profiled part is attached to the lower die. A plane coordinate system is established with the circumferential distribution center of the distance adjusting mechanisms as the origin, and the distance adjusting coordinates of each distance adjusting mechanism and the positioning coordinates of the center points of each profiled part are calibrated.

5. The cold-stamping inspection system of claim 4, wherein the inspection system is configured to inspect a plurality of automotive parts. The shape correcting controller is configured to select two distance adjusting mechanisms corresponding to two distance adjusting coordinates with the shortest straight line distance according to the positioning coordinates of the profiled part corresponding to the gas pressure sensor whose detected gas pressure change value exceeds the preset value, and control the two distance adjusting mechanisms to work.

6. The cold-stamping inspection and forming system for automotive parts of claim 4, wherein, The shape correcting controller is further configured to control the additional stroke of the corresponding distance adjusting mechanism to be larger when the straight line distance between the distance adjusting coordinates of the selected two distance adjusting mechanisms and the positioning coordinates is shorter. The shaping die is provided with an electronic level meter at the origin of the plane coordinate system, the electronic level meter is connected with a limited angle controller, and the distance adjusting mechanisms are connected with the limited angle controller.

7. The cold-stamping inspection and forming system for automotive parts of claim 1, wherein, The limited angle controller is configured to control the distance adjusting mechanism in the additional stroke to reduce the stroke when the electronic level meter detects that the inclination angle of the shaping die is equal to the limit value of the preset inclination angle range. The distance adjusting mechanism comprises: An inner sleeve is rotatably arranged on one of the piercing die and the shaping die; An adjusting screw is threadedly connected to one end of the inner sleeve and the other end of the adjusting screw corresponds to the other one of the shaping die and the piercing die; An anti-rotation rod is arranged in the end of the adjusting screw extending into the inner sleeve; and A self-locking type driving assembly is used to drive the inner sleeve to rotate and is electrically connected to the shaping controller.

8. The cold-stamping inspection and forming system for automotive parts of claim 1, wherein, A plurality of vertical guide rods are fixedly arranged on the upper end surface of the shaping die, the upper ends of the guide rods penetrate the piercing die and extend above the piercing die, and anti-disengaging blocks are fixedly arranged on the upper end surfaces of the guide rods; A ball seat is arranged on the piercing die, a ball head is rotatably arranged in the ball seat, a through hole is arranged in the ball head along the radial direction of the ball head, and the guide rods penetrate the through hole.

9. The cold-stamping inspection and forming system for automotive parts of claim 8, wherein, A compression spring is arranged around the guide rods between the shaping die and the piercing die, and the compression limit total length of the compression spring is less than the first stroke of the distance adjusting mechanism.

10. The cold-stamping inspection and forming system for automotive parts of claim 7, wherein, The self-locking type driving assembly comprises: A worm wheel is coaxially fixedly arranged on the outer peripheral wall of the inner sleeve; A worm is meshingly connected to the worm wheel; and A servo motor is used to drive the worm to rotate and is electrically connected to the shaping controller.

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