Cold stamping detection forming system for automobile parts

Abstract

The invention relates to an automobile part cold stamping detecting and forming system which comprises a lower die, a plurality of pressure measuring micro holes are formed in the positions, corresponding to the corners of a special-shaped part, of the lower die, and a pressurizing mechanism for introducing pressurizing gas into the pressure measuring micro holes and an air pressure sensor for detecting air pressure changes are arranged outside the lower die; a punching die; forming a stock mold; the distance adjusting mechanisms are provided with first strokes, second strokes and additional strokes, and when the distance adjusting mechanisms are in the first strokes, the punching heads can penetrate through the stock dies to conduct punching; in the second stroke, the punching head does not completely penetrate through the shaping die; and the correcting controller is configured to control all the distance adjusting mechanisms to be adjusted to the second stroke and control the corresponding distance adjusting mechanisms to be adjusted to the additional stroke when the air pressure change detected by any air pressure sensor exceeds a preset value, and then the distance adjusting mechanisms are slowly recovered to the second stroke. The device can automatically detect the bad gap condition of the special-shaped part of the stamping part and control the shaping mold to slightly tilt for secondary shaping, so that the corner 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 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 punching punch is uniformly installed on the left end face of the linkage plate from front to back. When the body part is punched, the cooling water in the cooling plate can reduce the temperature of the surface of the body part, thereby accelerating the heat dissipation efficiency of the body part.

[0004] However, in the process of manufacturing automobiles, it is necessary to stamp the metal plate into a part with multiple recesses and protrusions to adapt to the assembly of the whole vehicle, and punching is usually required in the recesses or protrusions. However, when the metal plate is stretched at the corners of these special-shaped parts, stress concentration will easily cause rupture or wrinkling. Even if a segmented stamping process is used to stretch these special-shaped parts multiple times, there is still a possibility of springback at the corners of the special-shaped parts before punching, which will cause precision deviation of the punched hole. SUMMARY

[0005] In order to improve the problem that the stamping part is prone to springback gap at the corners of the special-shaped part before punching, which causes precision deviation of the punched hole, 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: An automobile part cold stamping detection forming system comprises: a lower die, which is provided with a plurality of pressure measuring micro-holes at the corners of corresponding profiled parts, and a pressurizing mechanism and a gas pressure sensor for detecting the change in 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 profiled part corresponds to one pressurizing mechanism; a punching die, which is arranged above the lower die and has a punching head; 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; a distance adjusting mechanism, which is arranged between the punching die and the shaping die and has a first stroke, a second stroke and an additional stroke above the second stroke, 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 a shaping controller, which is configured to control all 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 in gas pressure detected by any gas pressure sensor exceeds the preset value, and gently recover to the second stroke when the punching die and the shaping die are locally in close contact.

[0007] Further, the pressurizing mechanism comprises: a branch air pipe, which is in communication with the pressure measuring micro-hole; a main air pipe, which is in communication with all or some of the branch air pipes corresponding to one profiled part, one or more main air pipes correspond to one profiled part; a pressurizing cabin, one end of which is in communication with the main air pipe and the other end of which is connected with a gas delivery pipe in communication with an external high-pressure gas source; a pressure regulating valve, which is arranged on the gas delivery pipe; and a pressure relief valve, which is arranged on the main air pipe; The gas pressure sensor is used to detect the gas pressure in the pressurizing cabin and is electrically connected to the shaping controller.

[0008] Further, before detecting the change in gas pressure after the stamping part is attached to the lower die, all pressure measuring micro-holes corresponding to the stamping part are blocked, and the reference value of the change in gas pressure in the pressurizing cabin when the pressure relief valve is opened at the set gas pressure is detected, and the part exceeding the reference value of the change in gas pressure is taken as the change in gas pressure after the stamping part is attached to the lower die.

[0009] Further, a plane coordinate system is established with the circumferential distribution center 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. The shape correcting controller is configured to: according to the positioning coordinates of the profile corresponding to the air pressure sensor detecting that the air pressure change value exceeds the preset value, select two distance adjusting mechanisms corresponding to the two distance adjusting coordinates with the shortest straight line distance and control the operation thereof.

[0010] Further, the shape correcting controller is further configured to: the shorter the distance adjusting coordinates of the selected two distance adjusting mechanisms from the positioning coordinates, the greater the additional stroke of the corresponding distance adjusting mechanism.

[0011] 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. 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.

[0012] Further, the distance adjusting mechanism comprises: an inner screw cylinder rotatably arranged on one of the piercing die and the shaping die; an adjusting screw rod, one end of which is threadedly connected to the inner screw cylinder, and the other end of which corresponds to the other one of the shaping die and the piercing die; an anti-rotation rod, which is arranged through the end of the adjusting screw rod extending into the inner screw cylinder; and a self-locking type driving assembly for driving the inner screw cylinder to rotate and being electrically connected to the shape correcting controller.

[0013] 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. A ball seat is mounted on the piercing die, a ball head is rotatably arranged in the ball seat, and a through hole is formed in the radial direction of the ball head, and the guide rods are arranged through the through hole.

[0014] Further, 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 compressible minimum distance between the shaping die and the piercing die.

[0015] Further, the self-locking type driving assembly comprises: a worm gear coaxially fixedly connected to the outer peripheral wall of the inner screw cylinder; a worm rod meshingly connected with the worm gear; and a servo motor for driving the worm rod to rotate and being electrically connected to the shape correcting controller.

[0016] In summary, the beneficial technical effects of the present application are: 1. By delivering the set pressure gas in the pressurized cabin 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 gap at the corner of the profiled part through the air pressure sensor, if the detected gap is good, all 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 gap is poor, all 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 gap is further 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 gap condition of the profiled part and reduce the rebound probability of the profiled part corner; 2. By gradually pressing the punching die and the shaping die through the multiple distance adjusting mechanisms, the distance adjusting mechanism in the additional stroke slowly returns to the second stroke, at which time the part corresponding to the corner of the profiled part on the shaping die first contacts the part with poor gap 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 distance adjusting mechanisms is consistent, the shaping die and the punching die are in parallel, 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, and to avoid the profiled part with poor gap being excessively squeezed to cause abnormal wall thickness; then the punching die is lifted to the set height, all distance adjusting mechanisms return 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 gap at the corner of the profiled part, and can ensure the punching quality and precision of the profiled part; 3. When the servo motor drives the worm gear structure transmission and rotates the inner screw cylinder, the servo motor speed can be adjusted to quickly adjust the distance adjusting mechanism between the first stroke and the second stroke, and slowly and accurately adjust when entering the additional stroke, which can effectively control the punching beat length; 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 shaping die, effectively ensuring the adjustment accuracy of the distance adjusting mechanism; 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 points of each profiled part on the punched part, the two distance adjusting mechanisms closest to the profiled part on the punched part can be more intuitively determined, and the corner of the profiled part of the gap defect punched part can be more comprehensively and accurately punched and shaped; further limited to the shorter the straight line distance between the distance adjusting coordinates and the positioning coordinates, the greater the additional stroke of the corresponding distance adjusting mechanism adjustment, which can further improve the matching degree of the impact energy diffusion range of the piercing die and the corner of the gap defect profiled part of the punched part when the piercing die impacts the shaping die, and ensure the secondary punching and shaping effect of the shaping die on the punched part; 5. The application detects the gap condition of the profiled part of the punched part through the air pressure sensor, automatically determines by the shaping controller, and controls the multiple distance adjusting mechanisms to adjust to the first stroke, the second stroke or the third stroke to selectively process the punched part, realizing automatic detection and automatic secondary shaping or automatic punching when punching the profiled part of the punched part prone to springback, without the intervention of the operator, and the time-consuming is short, the processing efficiency is higher, and it is suitable for processing most sheet materials. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is the overall structure of the embodiment of the application; Figure 2 is the cross-sectional view of the embodiment of the application when the distance adjusting mechanism is in the second stroke; Figure 3 is the cross-sectional view of the embodiment of the application when the distance adjusting mechanism is in the first stroke; Figure 4 is Figure 1 is a partial enlarged view of part A in Figure 5 is a partial enlarged view of part B in Figure 1 is a partial enlarged view of part C in Figure 6 Figure 1 is a partial enlarged view of part C in

[0018] BRIEF DESCRIPTION OF DRAWINGS 1, lower die; 11, pressure measuring micro hole; 2, piercing die; 21, piercing head; 3, shaping die; 31, electronic level; 41, bronchus; 42, trachea; 43, pressurizing cabin; 44, pressure regulating valve; 45, pressure releasing valve; 46, air pressure sensor; 47, gas conveying pipe; 5, distance adjusting mechanism; 51, inner screw cylinder; 52, adjusting screw; 53, anti-rotation rod; 54, pressure equalizing block; 61, guide rod; 62, anti-dropping block; 63, ball seat; 64, ball head; 641, through hole; 65, compression spring;​ 71, worm wheel; 72, worm; 73, servo motor; 8, punched part; 81, profiled portion. DETAILED DESCRIPTION

[0019] 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.

[0020] The embodiments of the present application disclose a cold stamping detection forming system for automobile parts. With reference to the drawings, the cold stamping detection forming system for automobile parts comprises: Figure 1 、 Figure 2 and Figure 3 , which comprises: 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 profiled portion 81 of the punched part 8. Specifically, if the profiled portion 81 is a concave portion, the pressure measuring micro-holes 11 are arranged at the corner of the groove bottom wall of the concave portion; if the profiled portion 81 is a convex portion, the pressure measuring micro-holes 11 are arranged at the corner of the root of the convex portion. The lower die 1 is externally provided with 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 a gas pressure sensor 46 for detecting the change of gas pressure. One gas pressure sensor 46 corresponds to at least one profiled portion 81 of the punched part 8. The gas pressure sensor 46 can be used to detect the change of gas pressure value, or the change rate of gas pressure, such as the gas pressure change value per unit time. Common gas pressure detectors can be usually selected.

[0021] The punching die 2 is arranged above the lower die 1 and has a punching head 21. According to different stamping processes, the punching die 2 can be a magnetic force driven stamping or an oil cylinder driven stamping.

[0022] The sizing die 3 is elastically connected to the lower side of the punching die 2 through a spherical hinge and is used to pre-size the punched part 8 in the lower die 1. The sizing die 3 has a through hole for the punching head 21 to pass through, so that when the punched part 8 is pre-pressed in the lower die 1 by the sizing die 3 and the punching die 2 continues to move downward, the punching head 21 can pass through the through hole and punch the punched part 8. The size of the through hole is larger than that of the punching head 21, so as to prevent the sizing die 3 from being stuck when it is slightly tilted.

[0023] The distance adjusting mechanism 5 is arranged between the punching die 2 and the shaping die 3, and is arranged in 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 punching head 21 can punch through the shaping die 3. When the distance adjusting mechanism 5 is in the second stroke, the punching head 21 does not completely pass through the shaping die 3. When not all distance adjusting mechanisms 5 are in the same additional stroke, the shaping die 3 is in a slight inclination state compared with the punching die 2, and the limit of the inclination angle of the shaping die 3 is ±0.5° to ±1°. Specifically, according to the shape contour of the stamping part 8, the central axis is determined, and the distance adjusting mechanisms 5 are arranged in an equidistant circumferential array around the central axis. In this embodiment, the distance adjusting mechanism 5 is arranged in four. The second stroke is greater than the first stroke, and the additional stroke is the stroke increased on the basis of the second stroke.

[0024] The shaping 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 mechanisms 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 punching die 2 and the shaping die 3 are tightly contacted. Specifically, in the initial state, the shaping die 3 and the punching die 2 are not in contact with the distance adjusting mechanism 5. When the shaping die 3 tightly presses the stamping part 8 in the lower die 1, the distance adjusting mechanism 5 is in contact with both the shaping die 3 and the stamping die as the punching die 2 continues to press down.

[0025] Referring to Figure 1 and Figure 4 The pressurizing mechanism comprises: The bronchus 41 is in communication with the pressure measuring micro hole 11. The general trachea 42 is in communication with all or some bronchi 41 corresponding to one special-shaped part 81. One special-shaped part 81 corresponds to one or more general tracheas 42. In the specific arrangement, the general trachea 42 is arranged according to the size of the special-shaped part 81 on the stamping part 8. If the size of the special-shaped part 81 is large, the special-shaped part 81 corresponds to two or more general tracheas 42. If the size of the special-shaped part 81 is small, the special-shaped part 81 corresponds to one general trachea 42. In this embodiment, one special-shaped part 81 corresponds to one general trachea 42. The pressurizing cabin 43 is in communication with the general trachea 42 at one end and is connected with the gas conveying pipe 47 in communication with the external high-pressure gas source at the other end. The pressure regulating valve 44 is arranged on the gas conveying pipe 47, and specifically can be an electromagnetic valve. The pressure releasing valve 45 is arranged on the general trachea 42, and specifically can be an electromagnetic valve. The aforementioned air pressure sensor 46 is used to detect the air pressure or change rate in the pressurizing cabin 43, and is electrically connected with the shaping controller.

[0026] In addition, before the air pressure sensor 46 detects the air pressure change after the stamping part 8 is fitted into the lower mold 1, all the corresponding pressure measuring micropores 11 are first blocked, and the air pressure in the pressurized chamber 43 is detected when the pressure relief valve 45 is opened at the set air pressure. The part that exceeds the air pressure change reference value is used as the air pressure change value after the stamping part 8 is fitted into the lower mold 1; that is, the pressure drop interference caused by inflation in the main air pipe 42 and each bronchus 41 is eliminated, ensuring that the air pressure change detected by the air pressure sensor 46 is more accurate.

[0027] Therefore, when the stamping part 8 is transferred to the lower die 1 after multiple segmented stamping and is ready for punching, the punching die 2 is first driven down to the shaping die 3 to press the stamping part 8 in the lower die 1, so that the corners of each special-shaped part 81 on the stamping part 8 are theoretically tightly fitted with the lower die 1. At the same time, the pressure relief valve 45 is closed and compressed gas is filled into the pressurized cabin 43 through the air supply pipe 47. The air pressure sensor 46 detects the air pressure in the pressurized cabin 43 in real time until it reaches the set value, such as 0.3~0.5MPa, and the pressure regulating valve 44 is closed; then, when the shaping die 3 presses the stamping part 8, the pressure regulating valve 44 is opened, and the compressed gas with the set air pressure value in the pressurized cabin 43 flows through the main air pipe 42, the bronchial pipe 41 and the corresponding pressure measuring micropores 11 to the gap between the corner of the stamping part 8 and the corresponding part of the lower die 1. If the fitting gap between the corner of the stamping part 8 and the lower die 1 is within the set value range, the pressure loss value detected by the air pressure sensor 46 is within the allowable range, and it is determined that the gap of the stamping part 8 at the corner is good and punching can be performed. At this time, all the distance adjustment mechanisms 5 are maintained in the first stroke, such as Figure 3 As shown, the punching die 2 can continue to move downward to complete the punching operation.

[0028] If the gap between the stamping part 8 and the lower die 1 at the corner exceeds the set value, the pressure loss value detected by the air pressure sensor 46 exceeds the set value, and it is determined that the gap of the stamping part 8 at the corner is poor and punching cannot be performed directly. The correction controller controls all the distance adjustment mechanisms 5 to adjust to the second stroke so that when the punching die 2 moves down, it can press the shaping die 3 but will not perform the punching operation. Figure 2 As shown, the correction controller continues to control the distance adjustment mechanism 5 closest to the shaped portion 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 downward, it can push the shaping die 3 to perform secondary shaping on the stamping part 8 on the lower die 1 in a certain slightly tilted posture. In addition, because the distance adjustment mechanism 5 closest to the shaped portion 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 thereto, which can improve the poor clearance of the shaped portion 81 at this location and reduce the probability of corner rebound of the shaped portion 81.

[0029] Meanwhile, when the piercing die 2 and the shaping die 3 are gradually pressed by the plurality of distance adjusting mechanisms 5, the distance adjusting mechanism 5 in the additional stroke slowly returns to the second stroke, at this time, the part corresponding to the corner of the profiled part of the stamping part 8 on the shaping die 3 first contacts the part of the profiled part of the stamping part 8 with poor gap, and then, by virtue of the ball hinge elastic connection of the shaping die 3 on the piercing 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 avoid the two being stuck, and at the same time, the shaping die 3 can slowly deflect back to normal compared to the lower die 1 with the contact part as the fulcrum, forming a rolling effect on the contact part; due to the buffering effect of the elastic connection between the shaping die 3 and the piercing die 2, it will not cause new quality defects by over-striking the stamping part in the certain area; finally, when the total stroke of all distance adjusting mechanisms 5 is consistent, ensuring that the shaping die 3 and the piercing die 2 are in a parallel state, the shaping die 3 will press the stamping part 8 completely on the lower die 1, to ensure the shaping effect of the shaping die 3 on the whole stamping part 8, and avoid the profiled part 81 of the stamping part 8 being excessively extruded to cause abnormal wall thickness; preferably, after the shaping die 3 is adjusted to be flat, it should be kept for 2-3s to further suppress the rebound of the corner part of the profiled part 81.

[0030] Then the piercing die 2 is lifted to a set height again, and all the distance adjusting mechanisms 5 return to the first stroke, and the shaping die 3 does not separate from the stamping part 8 on the upper die, and the piercing die 2 is pressed again to complete the piercing operation, which can effectively reduce the probability of rebound gap at the corner of the profiled part 81 of the stamping part 8, and can ensure the piercing quality and precision of the piercing on the profiled part 81 of the stamping part 8.

[0031] Among them, in order to ensure the piercing efficiency of the stamping part 8, the pressure regulating valve 44 is opened to make the external compressed gas enter the pressurizing cabin 43 after each piercing operation of the piercing die 2 is completed, and the gas pressure in the pressurizing cabin 43 is adjusted to a preset value. Moreover, since the pressure regulating valve 44 and the pressure releasing valve 45 are both solenoid valves, they can be controlled by the central controller, and similarly, the driving part for controlling the lifting of the piercing die 2 can also be controlled by the central controller, so as to realize the automatic operation of the pressurizing mechanism and the piercing operation.

[0032] In order to ensure that the distance adjusting mechanism 5 can withstand the impact of the piercing 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.

[0033] In a feasible embodiment, referring to Figure 1 and Figure 5 , the distance adjusting mechanism 5 comprises: an inner screw cylinder 51, which is rotationally arranged on one of the piercing die 2 and the shaping die 3, in this embodiment, the inner screw cylinder 51 is rotationally installed on the lower end face of the piercing die 2; Adjusting screw 52, one end is screwed into inner cylinder 51, the other end corresponds to one of the other punch die 2 and forming die 3, in this embodiment, the lower end of adjusting screw 52 corresponds to forming die 3, if necessary, a pressure equalizing block 54 can also be installed at the lower end of adjusting screw 52 to reduce the damage caused by the impact of punch die 2 on forming die 3; Anti-rotation rod 53, which is inserted into the end of adjusting screw 52 extending into inner cylinder 51, specifically, anti-rotation rod 53 is a square rod or hexagonal rod or equilateral triangular column with rounded corners, and is fixedly connected to the lower end surface of punch die 2 and located in the center of inner cylinder 51; and Self-locking drive assembly for driving inner cylinder 51 to rotate and electrically connected to the shape correcting controller. Specifically, it can be a combination of worm gear 71 and worm 72, such as coaxially fixing worm gear 71 on the outer wall of inner cylinder 51, rotating worm 72 on the lower end surface of punch die 2 and making worm 72 mesh with worm gear 71, and then installing a servo motor 73 for driving worm 72 to rotate on the lower end surface of punch die 2, and the speed of servo motor 73 is adjustable to facilitate the quick adjustment of distance adjusting mechanism 5 between the first stroke and the second stroke, and the slow and accurate adjustment when entering the additional stroke, which can effectively control the length of the stamping beat.

[0034] Therefore, when the servo motor 73 is started, the servo motor 73 drives the worm 72 to rotate, and drives the worm gear 71 meshed therewith to rotate, and then drives the inner cylinder 51 to rotate. Since the anti-rotation rod 53 restricts the rotation of the adjusting screw 52, the adjusting screw 52 can move axially along the inner 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 meshing structure of worm gear 71 and worm 72 has self-locking property, and the screwing structure of adjusting screw 52 and inner cylinder 51 also has self-locking property, when the distance adjusting mechanism 5 is adjusted to the corresponding stroke, it will not change state due to the impact between punch die 2 and forming die, effectively ensuring the adjustment accuracy of distance adjusting mechanism 5.

[0035] In another possible embodiment, the distance adjusting mechanism 5 comprises: Cam, which is rotatably arranged on one of punch die 2 and forming die 3, such as being rotatably arranged on the lower end surface of punch die 2; Self-locking drive assembly for driving the cam to rotate and electrically connected to the shape correcting controller, which can have the same structure as the self-locking drive assembly described above, or any drive structure that can drive the cam to rotate and remain locked after rotation.

[0036] Thus, the cam is driven to rotate by the self-locking type driving assembly, when the cam rotates to the short shaft end and is aligned with the shaping die 3, the distance adjusting mechanism 5 is in the first stroke; when the cam rotates to the long shaft end and is aligned with the shaping die 3, the distance adjusting mechanism 5 is in the maximum limit stroke in the additional stroke; when the cam rotates to the arc surface close to the long shaft end and is aligned with the shaping die 3, the distance adjusting mechanism 5 is in the second stroke. Thus, the convenient switching of the distance adjusting mechanism 5 between the first stroke, the second stroke and the additional stroke can also be realized.

[0037] Alternatively, in other possible embodiments, the cam is provided with two convex parts with different heights, the short convex part is used to correspond to the second stroke, and the long convex part is used to correspond to the maximum limit stroke in the additional stroke, so that the impact of the punching die 2 on the shaping die 3 can be effectively transmitted to the rotating shaft of the cam, and the locking requirement of the self-locking type driving assembly can also be reduced to a certain extent.

[0038] Further, in order to enable the shaping controller to more accurately control the corresponding distance adjusting mechanism 5 to work, 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 part 81 on the stamping part 8 are calibrated, the points not on the plane coordinate system are marked according to the projection coordinates on the plane of the coordinate system, and in this embodiment, the four distance adjusting mechanisms 5 are respectively arranged on the four coordinate axes of the plane coordinate system.

[0039] The shaping controller is configured to: according to the positioning coordinates of the profiled part 81 corresponding to the gas pressure sensor 46 that detects that the gas pressure change value exceeds the preset value, select two distance adjusting mechanisms 5 corresponding to two distance adjusting coordinates with the shortest straight line distance and control the working of the two distance adjusting mechanisms 5. After the punching die 2 impacts the shaping die 3, the profiled part 81 corner of the gap defect stamping part 8 can be more comprehensively and accurately stamped.

[0040] 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 controlled by the corresponding distance adjusting mechanism 5 to adjust. The coincidence degree of the impact energy diffusion range of the punching die 2 impacting the shaping die 3 and the profiled part 81 corner of the gap defect stamping part 8 can be further improved, and the secondary stamping and shaping effect of the shaping die 3 on the stamping part 8 can be ensured.

[0041] In addition, referring to Figure 1 and Figure 2 , the shaping die 3 is provided with an electronic level 31 at the origin of the plane coordinate system, the electronic level 31 is specifically installed at the central part of the upper end surface of the shaping die 3, the electronic level 31 is connected with a limited angle controller, and the plurality of distance adjusting mechanisms 5 are connected with the limited angle controller; The angle limiting control is configured to: when the electronic level 31 detects that the angle of the sizing die 3 is equal to the limit value of the preset angle range, such as ±0.5° or ±1°, the control reduces the stroke of the distance adjusting mechanism 5 in the additional stroke, but not less than the second stroke.

[0042] Therefore, when the sizing die 3 is attached to the stamping part 8, the distance adjusting mechanism 5 with different stroke heights enables the sizing die 3 to gradually assume a slight inclination posture during the process of the piercing die 2 impacting the sizing die 3, so as to pre-release part of the impact energy of the piercing die 2 to the gap defect profile 81 of the stamping part 8. If the electronic level 31 detects that the 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 piercing die 2 will completely impact the sizing die 3, which will cause the wall thickness of the gap defect profile 81 to be too thin or broken. After the limitation, the posture of the sizing die 3 can be adjusted and corrected in real time during the process of the piercing die 2 continuously moving downward to impact the sizing die 3, so as to improve the stamping defects caused by the above-mentioned situation.

[0043] In addition, in order to realize the slight inclination active connection between the sizing die 3 and the piercing die 2.

[0044] Referring to Figure 1 and Figure 6 , a plurality of vertical guide rods 61 are fixedly connected to the upper end surface of the sizing die 3, the upper end of the guide rod 61 penetrates the piercing die 2 and extends above the piercing die 2, and a anti-falling block 62 is fixedly connected to the upper end surface of the guide rod 61. A ball seat 63 is installed on the piercing die 2, the ball head 64 is rotatably arranged in the ball seat 63, and a through hole 641 is formed in the radial direction of the ball head 64, and the guide rod 61 penetrates the through hole 641.

[0045] The guide rod 61 is sleeved with a compression spring 65 between the sizing die 3 and the piercing die 2, and the compression limit total length of the compression spring 65 is less than the first stroke of the distance adjusting mechanism 5, that is, the piercing die 2 is in a hard contact state with the sizing die 3 during the piercing operation, which can avoid the interference of the flexible contact of the compression spring 65 to the stamping quality. The contact between the sizing die 3 and the lower die 1 is a flexible contact, and through the arrangement of the compression spring 65, the influence of the sizing die 3 on the wall thickness stability of the stamping part during the correction of the local springback of the stamping part can be avoided.

[0046] Therefore, by penetrating the ball head 64 on the piercing die 2 with the guide rod 61 on the sizing die 3, the sizing die 3 can not only maintain the effective active connection with the piercing die 2, but also realize the slight inclination posture of the sizing die 3 compared with the piercing die 2, which is convenient for the secondary stamping of the corner of the gap defect profile 81 of the stamping part 8.

[0047] Unless otherwise defined, technical terms or scientific terms used in the present application shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. Unless otherwise defined, the terms "first", "second" or "third" and the like in the description and in the claims, are used for distinguishing between similar elements and not necessarily for describing a sequential or chronological order. The terms "one", "another", "an" or "some" as well as similar referents in the context of describing the specification and claims are to be construed to be open-ended, i.e., to cover both singular and plural referents unless otherwise indicated. The terms "including", "containing" or "comprising" and the like are not intended to exclude other integers or steps, but to "include" or "comprise" other integers or steps unless otherwise indicated. The terms "connected", "coupled" or "pathway" and the like are not limited to direct connections, couplings or pathways, but can also include indirect connections, couplings or pathways unless otherwise indicated.

[0048] The above are only preferred embodiments of the present application, not intended to limit the protection scope of the present application, therefore: any equivalent changes made according to the structure, shape, principle of the present application shall be covered within the protection scope of the present application.

Claims

1. A cold stamping detection and forming system for automobile parts, characterized in that: include: The lower die has a plurality of pressure-measuring microholes at the corners corresponding to the special-shaped parts. The lower die is provided with a pressurizing mechanism for introducing pressurized gas into the pressure-measuring microholes after the stamping part is attached to the lower die, and an air pressure sensor for detecting air pressure changes. Each special-shaped part in the stamping part corresponds to at least one pressurizing mechanism. The punching die is lifted and arranged above the lower die, and has a punching head on it; A shaping die, connected to the lower end surface of the punching die, for pre-shaping the stamping part in the lower die; The distance adjustment mechanism is provided in multiple numbers and is distributed between the punching die and the shaping die in an evenly spaced circular array. The distance adjustment mechanism has a first stroke, a second stroke, and an additional stroke above the second stroke. When the distance adjustment mechanism is in the first stroke, the punching head can pass through the shaping die to punch holes; when the distance adjustment mechanism is in the second stroke, the punching head does not completely pass through the shaping die. as well as The correction controller is configured to: when the air pressure change detected by any of the air pressure sensors exceeds a preset value, control all the distance adjustment mechanisms to adjust to the second stroke and control the distance adjustment mechanisms in the corresponding areas to adjust to the additional stroke, and smoothly restore to the second stroke when the punching die and the shaping die are partially pressed together.

2. The cold stamping detection and forming system for automobile parts according to claim 1, characterized in that: The pressurizing mechanism comprises: a bronchus, connected to the pressure measuring micropore; A main trachea is connected to all or some of the bronchi corresponding to one of the special-shaped parts, and one of the special-shaped parts corresponds to one or more of the main trachea; A pressurized cabin, one end of which is connected to the main gas pipe and the other end of which is connected to a gas pipe connected to an external high-pressure gas source; a pressure regulating valve, provided on the gas transmission pipe; and A pressure relief valve is provided on the main air pipe; The air pressure sensor is used to detect the air pressure in the pressurized cabin and is electrically connected to the correction controller.

3. The cold stamping detection and forming system for automobile parts according to claim 2, characterized in that: Before the air pressure sensor detects the air pressure change after the stamping part fits the lower mold, it first blocks all the corresponding pressure measuring micropores and detects the air pressure change reference value when the pressure relief valve is opened at the set air pressure in the pressurized cabin. The part that exceeds the air pressure change reference value is used as the air pressure change value after the stamping part fits the lower mold.

4. The cold stamping detection and forming system for automobile parts according to claim 1, characterized in that: Establishing a plane coordinate system with the centers of the circumferential distribution of the plurality of distance adjusting mechanisms as the origin, and calibrating the distance adjusting coordinates of each distance adjusting mechanism and the positioning coordinates of the center point of each special-shaped portion on the stamping part; The correction controller is configured to: select two distance adjustment mechanisms corresponding to the two distance adjustment coordinates with the shortest straight-line distances therefrom according to the positioning coordinates of the special-shaped part corresponding to the air pressure sensor that detects that the air pressure change value exceeds the preset value, and control their operation.

5. The cold stamping detection and forming system for automobile parts according to claim 4, characterized in that: The orthotic controller is further configured such that: in the two selected distance adjustment mechanisms, the shorter the straight-line distance between the distance adjustment coordinate and the positioning coordinate is, the larger the additional stroke adjusted by controlling the corresponding distance adjustment mechanism is.

6. The cold stamping detection and forming system for automobile parts according to claim 4, characterized in that: The shaping die is provided with an electronic level at the origin of the plane coordinate system, the electronic level is connected to a limited angle controller, and the plurality of distance adjustment mechanisms are all connected to the limited angle controller; The angle limiting control is configured as follows: when the electronic level detects that the inclination angle of the molding die is equal to the limit value of the preset inclination angle range, the distance adjustment mechanism in the additional stroke is controlled to reduce the stroke.

7. The cold stamping detection and forming system for automobile parts according to claim 1, characterized in that: The distance adjustment mechanism comprises: An inner screw barrel is rotatably mounted on one of the punching die and the shaping die; An adjusting screw, one end of which is threadedly connected to the inner screw barrel and the other end of which corresponds to the other of the shaping die and the punching die; an anti-rotation rod, which is provided through one end of the adjusting screw extending into the inner screw barrel; and The self-locking drive assembly is used to drive the inner screw barrel to rotate and is electrically connected to the correction controller.

8. The cold stamping detection and forming system for automobile parts according to claim 1, characterized in that: The upper end surface of the shaping die is fixedly connected to a plurality of vertically arranged guide rods, the upper ends of the guide rods pass through the punching die and extend above the punching die, and the upper end surfaces of the guide rods are fixedly connected to anti-slip blocks; A ball seat is installed on the punching die. A ball head is rotatably arranged in the ball seat. A through hole is opened in the ball head along its radial direction, and a guide rod is inserted into the through hole.

9. The cold stamping detection and forming system for automobile parts according to claim 8, characterized in that: A compression spring is sleeved on the circumference of the guide rod and is located between the shaping die and the punching die. The total compression limit length of the compression spring is less than the first stroke of the distance adjustment mechanism.

10. The cold stamping detection and forming system for automobile parts according to claim 4, characterized in that: The self-locking drive assembly comprises: A worm wheel is coaxially fixed to the outer peripheral wall of the inner screw barrel; a worm, meshingly connected to the worm wheel; and The servo motor is used to drive the worm to rotate and is electrically connected to the orthosis controller.

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