CN116106220A - High-precision positioning and leveling device for metal etched lead frame and control method thereof - Google Patents

Abstract

The invention discloses a high-precision positioning and leveling device for a metal etched lead frame and a control method thereof, and belongs to the technical field of auxiliary devices for lead frames. The positioning and leveling device comprises a servo system, a servo motor of the servo system is fixed on a fixing device support, a positioning and leveling assembly is arranged on the upper portion of the fixing device support, a visual detection assembly is arranged below the positioning and leveling assembly, and the servo system, the positioning and leveling assembly and the visual detection assembly are in data communication with an upper computer. Positioning and leveling the lead frame through the positioning and leveling assembly, checking the positioning and leveling effect through the visual detection assembly, thereby ensuring the positioning and leveling accuracy, and automatically controlling the corresponding actions of the positioning and leveling assembly and the visual detection assembly through the upper computer and the servo system; based on this, this device has realized the automatic positioning and the leveling to lead frame to can be synchronous to the location leveling effect examine, thereby guaranteed the degree of accuracy of location leveling.

Description

High-precision positioning and leveling device for metal etched lead frame and control method thereof

Technical Field

The invention belongs to the technical field of lead frame auxiliary devices, and particularly relates to a high-precision positioning and leveling device for a metal etched lead frame and a control method thereof.

Background

After the metal etched lead frame is produced, defects are detected by an automatic defect detector. When defect detection is carried out, the lead frame is usually required to be placed on the positioning device, then the linear motor drives the positioning device to pass through the detection scanning area quickly, three line scanning cameras detect the upper surface and the lower surface of the lead frame simultaneously, and finally the metal etched lead frame is classified and stored according to detection results. The stability and the position accuracy of the lead frame are important in the high-speed detection process, and the detection effect can be greatly affected if bending, shaking or position deviation occurs. The thickness of the metal etched lead frame is in the range of 0.8-1.5mm, the width is 75-95 mm, and the length is 220-270 mm. The periphery of the lead frame group is provided with a wrapping metal sheet with the width of 5mm for fixing and sucking.

The conventional positioning device is composed of two separate fixing plates, a single-side groove with width of 5mm is arranged on the inner side of each fixing plate, and a plurality of 1.5mm grooves are equidistantly arranged at the bottom of each groove ² After the lead frame is placed on the device, vacuum is started to suck the lead frame on the groove. The fixing mode can only absorb the area with the edge of 5mm, so that the slight sinking condition of the middle of the frame caused by the self weight can not be solved, namely, the leveling can not be realized, and the detection accuracy is reduced; the other problem is that the positioning is not accurate, in the process that the lead frame is sucked onto the positioning device from the tray, the lead frame is not necessarily completely positioned on the central axis of scanning due to shaking caused by opening and closing of air pressure, if the distance between grooves on two sides is large, the lead frame is easy to put in, but cannot correct, and if the distance between the grooves is small, the situation that the lead frame cannot be put in can occur; in addition, the distance between the two fixing plates needs to be manually adjusted according to different models by using the positioning device, so that inaccurate positioning is caused, the production time is delayed, and the production efficiency is reduced. Another existing positioning method is that after the lead frame is placed into the groove, a mechanical device is used for pressing the edge, and the edge is slightly pulled to two sides for leveling, but the whole mechanical action correction time is longer; the lead frame cannot be ensured to be positioned on the scanning central axis, and accurate positioning cannot be realized; and mechanical stretching risks breaking the fine leads, resulting in reduced product yields.

Therefore, a more advanced positioning device is needed, which can rapidly and automatically and accurately position and level the lead frame, and intelligently detect the positioning and leveling result, so that the production efficiency is improved.

Disclosure of Invention

The invention aims to provide a high-precision positioning and leveling device for a metal etched lead frame and a control method thereof, which are used for solving the following three main problems of the traditional positioning device: firstly, the positioning process of lead frames of different types cannot be completely separated from manual operation, so that the automation degree is low; secondly, the leveling effect can not be realized while the lead frame is positioned, or the leveling time is too long and the operation is more complex; third, the accuracy of positioning cannot be guaranteed.

The invention is realized by adopting the following technical scheme:

a metal etching lead frame high accuracy location levelling device for realize that lead frame carries out the location levelling before the defect detection through automatic defect detection machine, including servo, servo's servo motor is fixed on the fixing device support, and fixing device support upper portion is equipped with the location levelling subassembly, and location levelling subassembly below is equipped with visual detection subassembly, and servo, location levelling subassembly, visual detection subassembly all carry out data communication with the host computer.

In the scheme, the positioning and leveling device brings the metal etched lead frame to quickly pass through the detection area of the automatic defect detector, so that defect detection of the lead frame is realized. Before that, the positioning and leveling device needs to perform positioning and leveling on the lead frame placed on the positioning and leveling device, and particularly positions and levels the lead frame through the positioning and leveling component, the effect of positioning and leveling is checked through the visual detection component, so that the accuracy of positioning and leveling is ensured, and corresponding actions of the positioning and leveling component and the visual detection component are automatically controlled through the upper computer and the servo system; based on this, this device has realized the automatic positioning and the leveling to lead frame to can be synchronous to the location leveling effect examine, thereby guaranteed the degree of accuracy of location leveling.

Further, the positioning and leveling assembly comprises two parallel lead frame fixing devices, two sliding areas are arranged at two ends of each lead frame fixing device, and an adsorption area is arranged at the middle part of each lead frame fixing device.

In the above scheme, the sliding area is used for realizing the opening and closing movement of the two lead frame fixing devices, and the adsorption area is used for carrying out adsorption positioning and stretching leveling on the lead frames placed in the device.

Further, the outermost ends of the two sliding areas are respectively and slidably connected to two fixed plate sliding rails, and the two fixed plate sliding rails are respectively arranged at two ends of the fixing device bracket; the inside of the two sliding areas is respectively and slidably penetrated through a fixed plate screw rod, the fixed plate screw rod is parallel to the fixed plate sliding rail, and screw rod gears are arranged at the two ends of the fixed plate screw rod.

In the scheme, the lead screw gears position the lead frame fixing device through the fixed plate lead screws, and the nut seats of the lead screw gears at the two ends of each fixed plate lead screw are in a reverse relationship, namely a positive thread and a reverse thread, so that after the servo motor drives the lead screw gears, the two nut seats can perform actions such as opening and clamping at the same distance towards the two ends of the fixed plate lead screw; the lead frame fixing device is opened and closed along the fixing plate sliding rail, so that the fixing plate sliding rail is used for ensuring that the lead frame fixing device does not incline when moving.

Further, be equipped with the fixed plate in the adsorption area, the one end of fixed plate is equipped with a plurality of trachea connection screw holes, and the one end of a fixed plate inside vacuum pipe is connected to every trachea connection screw hole, and the other end of every inside vacuum pipe of fixed plate is connected a plurality of recess vacuum connection mouth, and the vacuum adsorption hole of seting up is adsorbed to a recess vacuum connection mouth connection recess side.

In the above-mentioned scheme, the fixed plate is used for directly holding and positioning and leveling lead frame, and wherein positioning and leveling effect is realized through vacuum adsorption and tensile mode, and the inside vacuum pipe of trachea connection screw hole, fixed plate, recess vacuum connector, recess adsorption area and vacuum adsorption hole cooperation realize the vacuum.

Further, the vacuum adsorption holes are strip-shaped slotted holes, and an arc-shaped slope is arranged at one end of each vacuum adsorption hole, which is far away from the vacuum connection port of the groove; one side of the vacuum adsorption hole extends into the groove adsorption area.

In the scheme, one side of the groove vacuum connector is connected with the groove adsorption area, and the design of a vacuum pipeline of the groove adsorption area is the key of adsorption and stretching. The vacuum adsorption holes are not conventional round holes, but bar-shaped slotted holes, and one ends of the bar-shaped slotted holes are provided with circular arc slopes from outside to inside, so that a obliquely downward pulling force is applied to the lead frame placed on the groove adsorption area during vacuum adsorption, and the lead frame can be initially leveled; in order to enhance the leveling effect, the lead frame needs to be stretched again in the horizontal direction, and the part of the vacuum adsorption hole extending into the groove adsorption area can directly face the edge of the lead frame, so that the horizontal adsorption force can be generated on the lead frame, and the lead frame is completely leveled and the middle recess is eliminated.

Further, the vision detection assembly comprises a detection camera, the detection camera is fixed on the camera support, and a camera lens and a camera light source are sequentially arranged on the detection camera.

In the scheme, the detection camera is an industrial camera, and has higher transmission force, anti-interference force and constant imaging capability compared with the common camera; the camera light source can illuminate the target, improve the brightness, ensure the image stability and is beneficial to image processing.

A control method of a high-precision positioning and leveling device for a metal etched lead frame is applied to the positioning and leveling device and specifically comprises the following steps:

s1: the upper computer of the positioning and leveling device sends corresponding pulse signals to the servo system according to the model of the product to be detected; the lead frames of different models respectively correspond to different pulse signals, and the servo system controls the running time of the servo motor according to the pulse signals.

S2: the servo system controls the servo motor to run so that the two lead frame fixing devices do separation movement; the servo motor operates to drive the fixed plate screw to rotate through the screw gear, so that the lead frame fixing device moves.

S3: the groove adsorption areas on each lead frame fixing device move along with the lead frame fixing device, so that the interval distance between the groove adsorption areas on two sides is continuously increased; the groove adsorption areas on two sides refer to groove adsorption areas respectively arranged on the two lead frame fixing devices.

S4: when the distance between the groove adsorption areas at two sides is 4mm greater than the width of the product to be detected, the two lead frame fixing devices stop moving, at the moment, the upper computer sends a feeding instruction to the automatic defect detector, and the feeding device of the automatic defect detector places the product to be detected on the groove adsorption areas; the running time of the servo motor is set according to different pulse signals corresponding to lead frames of different types, and the running time can ensure that the distance between the two lead frame fixing devices after moving is 4mm more than the width of a product to be detected, and the lead frame fixing devices are considered to be opened.

S5: feeding back a completion instruction to the upper computer after feeding of the automatic defect detector is completed, and then starting vacuum by the lead frame fixing device, so that a product to be detected is adsorbed on the groove adsorption area, and preliminary positioning and leveling are realized; wherein, the upper computer controls and opens the vacuum generator at the front end of the vacuum pipeline inside the fixing plate, so that the lead frame fixing device can start vacuum. When the lead frame fixing device is started to be vacuumized, the air pipe connecting threaded holes realize that the vacuum pipeline inside the fixing plate is communicated with an external air pipe; the vacuum pipeline in the fixing plate is communicated with the pipeline along the width direction of the fixing plate, so that vacuum is introduced into the groove vacuum connection port from one end of the fixing plate; the groove vacuum connection ports distribute vacuum to eleven vacuum adsorption holes in the groove adsorption area, so that the vacuum adsorption function of the whole area of the groove adsorption area is realized.

S6: after the vacuum is started for 1S, the servo motor drives the two lead frame fixing devices to fold towards the middle, so that the distance between the groove adsorption areas at the two sides is consistent with the width of a product to be detected, and accurate positioning and leveling are realized; in order to ensure smooth feeding, the distance between the two lead frame fixing devices after the lead frame is separated from each other is 4mm more than the width of a product to be detected, and when the lead frame is fed and positioned and leveled, the two lead frame fixing devices are moved together until the distance between the two lead frame fixing devices is the same as the width of the product to be detected, so that the lead frame is clamped, and the stability of the lead frame in the high-speed operation process of the positioning and leveling device is ensured; and the lead frame is clamped and then positioned on the central axis of the scanning camera of the detection area of the automatic defect detector, so that the accuracy of positioning and defect detection is ensured.

S7: the servo system sends a working signal to the visual detection component, the visual detection component shoots and analyzes the data to obtain a judgment result, and the upper computer displays the data and the result through the display interface; meanwhile, if the analysis result is that the positioning and leveling effect is qualified, the upper computer sends a working signal to the automatic defect detector; if the analysis result is that the positioning and leveling effect is not qualified, the upper computer displays an alarm signal through a display interface. Conventionally, the lead frame is clamped and then can be located on the central axis of the scanning camera of the detection area of the automatic defect detector, but sometimes the lead frame in the feeding device is slightly inclined or occasionally shakes when the feeding device is used for feeding, so that the lead frame does not integrally enter the groove adsorption area during feeding, and the sporadic problems that the adsorption and clamping cannot be corrected need a visual detection assembly for detection and closed-loop control.

Further, in S7, the process of photographing and analyzing data by the visual inspection component includes the following sub-steps:

s7-1: the servo system sends a starting signal to an input point of the detection camera, an output point of the detection camera controls a camera light source to trigger, and a camera lens shoots to obtain an image;

s7-2: firstly, carrying out edge comparison on the images through a halcon algorithm, and generating a preset rectangular frame according to the model of the product to be detected, wherein the preset rectangular frame represents a specified detection area of the product to be detected by an automatic defect detector; the specified detection area represented by the preset rectangular frame is positioned at the central axis of the scanning camera of the automatic defect detector, and the central axis of the preset rectangular frame coincides with the central axis of the scanning camera.

S7-3: carrying out algorithm processing on the image again to generate an actual rectangular frame, wherein the actual rectangular frame represents an actual detection area of the product to be detected when the product to be detected is detected by the automatic defect detector;

s7-4: obtaining a distance difference value between an actual rectangular frame and a preset rectangular frame and carrying out statistics;

s7-5: generating OK or NG two conclusions according to the distance difference value result counted in the step S7-4, directly feeding the NG conclusion back to the upper computer, representing that the positioning leveling effect is unqualified, further calculating the widths of the specified detection area and the actual detection area for the OK conclusion, and counting the difference value between the width of the specified detection area and the width of the actual detection area;

s7-6, generating OK or NG two conclusions again according to the difference value result counted in the S7-5 and feeding back the conclusions to the upper computer, wherein the OK conclusions represent that the positioning leveling effect is qualified, and the NG conclusions represent that the positioning leveling effect is unqualified.

Further, in the step S7-3, the process of generating the actual rectangular frame includes the following sub-steps:

s7-31: RGB-separating the image and converting the image into HSV components;

s7-32: performing threshold processing on the S component image, selecting a range of 45-120, and removing a black fixing device and a white vacuum part to form an ROI region;

s7-33: the inner edge of the ROI area is the actual rectangular frame.

Further, in the step S7-4, the specific method for obtaining the distance difference and performing statistics is to select a plurality of points at the lateral position of the actual rectangular frame, then calculate the distance between each point and the preset rectangular frame, and select the maximum distance for recording;

in the step S7-5, the difference value of the distance between the actual rectangular frame and the preset rectangular frame is lower than 0.05cm, and is an OK conclusion, or else, is an NG conclusion;

in the step S7-6, when the difference between the specified detection area width and the actual detection area width is lower than 0.02cm, an OK conclusion is reached, and otherwise, an NG conclusion is reached.

The beneficial effects achieved by the invention are as follows:

compared with the traditional positioning device which cannot take the positioning and leveling functions into consideration and needs partial manual adjustment, the positioning and leveling device can realize automatic accurate positioning and leveling on the basis of fixing the lead frame; further, the visual detection assembly is used for detecting the positioning leveling effect, so that the feedback of the state and the data of each piece of lead frame is ensured, the positioning leveling accuracy is ensured, and the defect detection accuracy is greatly improved.

Drawings

FIG. 1 is a schematic view of the overall structure of a positioning and leveling device of the present invention;

FIG. 2 is a schematic view of the structure of the bottom of the positioning and leveling device of the present invention;

FIG. 3 is a schematic view showing an intermediate structure of a lead frame fixing device in the positioning and leveling device of the present invention;

FIG. 4 is a schematic illustration of the outside plate structure of the structure of FIG. 3;

FIG. 5 is a schematic view of the inside board structure of the structure of FIG. 3;

FIG. 6 is a schematic view of the structure of the fixed plate in the structure shown in FIG. 3;

FIG. 7 is an enlarged view of the structure at I in FIG. 6;

FIG. 8 is a cross-sectional view taken vertically along the dashed line AB in FIG. 6 and enlarged;

fig. 9 is a display interface of a positional relationship between an actual rectangular frame and a preset rectangular frame of the metal-etched lead frame B;

fig. 10 is a display interface of a positional relationship between an actual rectangular frame and a preset rectangular frame of the metal-etched lead frame C;

in the figure: 1. a fixed plate slide rail; 2. a fixed plate screw; 3. a lead screw gear; 4. lead frame fixing means; 5. a servo motor; 6. a fixture bracket; 7. a camera light source; 8. a camera lens; 9. detecting a camera; 10. a camera mount; 4-1, outer side plates; 4-2 inner side plates; 4-3, fixing plate; 4-31, connecting the air pipe with the threaded hole; 4-32, fixing the vacuum pipeline in the plate; 4-33, a groove vacuum connector; 4-34, a groove adsorption zone; 4-35, vacuum adsorption holes.

Detailed Description

For clarity of explanation of the solution of the present invention, the following will be further explained with reference to the accompanying drawings:

referring to fig. 1 to 8, embodiment 1 of the present invention:

a metal etching lead frame high accuracy location levelling device for realize that the lead frame carries out the location levelling before the defect detection through automatic defect detection machine, including servo, servo's servo motor 5 is fixed on fixing device support 6, and fixing device support 6 upper portion is equipped with the location levelling subassembly, and location levelling subassembly below is equipped with visual detection subassembly, and servo, location levelling subassembly, visual detection subassembly all carry out data communication with the host computer. In the embodiment, an industrial personal computer is used as an upper computer, programming is performed in a language C in the industrial personal computer, an interface is generated, a Lei Sai control board card is installed in the industrial personal computer, data communication is performed on the servo motor, the visual detection assembly and the positioning leveling assembly, and digital quantity signals are transmitted to a control system of the automatic defect detection machine. Wherein:

the positioning and leveling assembly comprises two parallel lead frame fixing devices 4, two sliding areas are arranged at two ends of each lead frame fixing device 4, and an adsorption area is arranged at the middle part of each lead frame fixing device 4;

the outermost ends of the two sliding areas are respectively and slidably connected to the two fixed plate sliding rails 1, and the two fixed plate sliding rails 1 are respectively arranged at two ends of the fixing device bracket 6; the insides of the two sliding areas slide through a fixed plate lead screw 2, the fixed plate lead screw 2 is parallel to the fixed plate sliding rail 1, and lead screw gears 3 are arranged at two ends of the fixed plate lead screw 2; the nut seats of the screw gears 3 at the two ends of each fixed plate screw 2 are in a reverse relationship, namely a positive thread and a negative thread;

an outer side plate 4-1, an inner side plate 4-2 and a fixing plate 4-3 are arranged in the adsorption area, the fixing plate 4-3 is fixed on one side surface of the inner side plate 4-2, 5 air pipe connecting threaded holes 4-31 are formed in one end of the outer side plate 4-1, and each air pipe connecting threaded hole 4-31 is communicated with an external air source; the other end of each air pipe connecting threaded hole 4-31 is connected with one end of a vacuum pipeline 4-32 in the inside of a fixed plate, the other end of each vacuum pipeline 4-32 in the inside of the fixed plate is connected with 1 groove vacuum connecting port 4-33, each groove vacuum connecting port 4-33 is connected with 11 vacuum absorbing holes 4-35 formed in the side face of 1 groove absorbing area 4-34, the width of the groove absorbing area 4-34 in the embodiment is 4.5mm, and the edge of a metal etching lead frame with the width smaller than or equal to 5mm can be placed; 10 vacuum adsorption holes 4-35 are uniformly arranged in the groove adsorption zone 4-34 at intervals of 5mm, the vacuum adsorption holes 4-35 are strip-shaped slotted holes with the width of 1mm and the depth of 1.5mm, one end of each vacuum adsorption hole 4-35, which is far away from the groove vacuum connection port 4-33, is provided with a circular arc slope, and one side of each vacuum adsorption hole 4-35 extends into the groove adsorption zone 4-34 for 0.5mm;

the vision detection assembly comprises a detection camera 9, the detection camera 9 is fixed on a camera support 10, and a camera lens 8 and a camera light source 7 are sequentially arranged on the detection camera 9.

The working principle and working process of the embodiment are as follows:

selecting a metal etching lead frame A, wherein the width of the lead frame of the model is 85mm, positioning and leveling the metal etching lead frame A by a positioning and leveling assembly by a positioning and leveling device, checking the positioning and leveling effect by a visual detection assembly, thereby ensuring the positioning and leveling accuracy, automatically controlling the corresponding actions of the positioning and leveling assembly and the visual detection assembly by an industrial personal computer and a servo system, and transmitting the conclusion of the positioning and leveling effect to a control system of an automatic defect detector by the industrial personal computer; based on the above, the device realizes automatic positioning and leveling of the metal etched lead frame A, and can synchronously check the positioning and leveling effect, thereby ensuring the positioning and leveling accuracy; wherein:

the sliding area is used for realizing the opening and closing movement of the two lead frame fixing devices 4, and the adsorption area is used for carrying out adsorption positioning and stretching leveling on the metal etched lead frames A put into the device;

the lead screw gear 3 positions the lead frame fixing device 4 through the fixed plate lead screw 2, and after the servo motor 5 drives the lead screw gear 3, the two nut seats can perform actions such as opening, clamping and the like at the same distance towards the two ends of the fixed plate lead screw; the lead frame fixing device 4 performs opening and closing movement along the fixing plate sliding rail, so that the fixing plate sliding rail 1 is used for ensuring that the lead frame fixing device 4 does not incline when moving;

the fixing plate 4-3 is used for directly accommodating and positioning and leveling the metal etched lead frame A, wherein the positioning and leveling effect is realized by means of adsorption and stretching, and the design of a vacuum pipeline of the groove adsorption area 4-34 is the key of adsorption and stretching. The vacuum adsorption holes 4-35 are not conventional round holes, but bar-shaped slotted holes, and one ends of the bar-shaped slotted holes are provided with circular arc slopes from outside to inside, so that when vacuum adsorption is performed, a downward oblique pulling force is applied to the metal etching lead frame A placed on the groove adsorption areas 4-34, and the metal etching lead frame A can be leveled in a preliminary step; in order to enhance the leveling effect, the metal etched lead frame A needs to be stretched again in the horizontal direction, and the part of the vacuum adsorption holes 4-35 extending into the groove adsorption areas 4-34 can directly face the edge of the metal etched lead frame A, so that horizontal adsorption force can be generated on the metal etched lead frame A, and the metal etched lead frame A is thoroughly leveled and middle pits are eliminated;

the visual detection assembly is used for detecting the effect of positioning and leveling so as to link the automatic defect detector to perform corresponding actions, wherein the detection camera 9 is an industrial camera, and has higher transmission force, anti-interference force and constant imaging capability compared with a common camera; the camera light source 7 can illuminate the target, improve the brightness, ensure the image stability and facilitate the image processing.

Referring to fig. 1 to 10, embodiment 2 of the present invention:

a control method of a high-precision positioning and leveling device for a metal etched lead frame is applied to the positioning and leveling device in the embodiment 1, wherein a box of metal etched lead frame with the model GX2365 is adopted, the width of the lead frame of the model is 90mm, and the box of lead frame comprises a normal metal etched lead frame B and a slightly inclined metal etched lead frame C;

the process of processing the metal etched lead frame B specifically includes the steps of:

s1: the industrial personal computer sends a pulse signal corresponding to the metal etching lead frame B to the servo system;

s2: the servo system controls the servo motor 5 to run so that the two lead frame fixing devices 4 do separation movement;

s3: the groove adsorption areas 4-34 on each lead frame fixing device 4 move along with the lead frame fixing devices 4, so that the interval distance between the groove adsorption areas 4-34 on two sides is continuously increased; the groove adsorption areas 4-34 on the two sides refer to the groove adsorption areas 4-34 respectively arranged on the two lead frame fixing devices 4;

s4: when the distance between the groove adsorption areas 4-34 on two sides reaches 94mm, the two lead frame fixing devices 4 stop moving, at the moment, the industrial personal computer sends a feeding instruction to the automatic defect detector, and the feeding device of the automatic defect detector places the metal etched lead frame B on the groove adsorption areas 4-34;

s5: after the automatic defect detector feeds back a finishing instruction to the industrial personal computer, the industrial personal computer controls the lead frame fixing device 4 to start vacuum through a servo system, so that the metal etched lead frame B is adsorbed on the groove adsorption areas 4-34, and preliminary positioning and leveling are realized;

s6: after the vacuum 1S is started, the servo motor 5 drives the two lead frame fixing devices 4 to fold towards the middle, so that the separation distance between the groove adsorption areas 4-34 on the two sides is 90mm, and accurate positioning and leveling are realized, and the metal etched lead frame B is positioned on the central axis of the scanning camera of the detection area of the automatic defect detector;

s7: the servo system sends a working signal to the visual detection assembly, the visual detection assembly shoots and analyzes the data to obtain a judging result, and the industrial personal computer displays the data and the result through a display interface; meanwhile, if the analysis result is that the positioning and leveling effect is qualified, the industrial personal computer sends a working signal to the automatic defect detector; if the analysis result is that the positioning and leveling effect is not qualified, the industrial personal computer displays an alarm signal through a display interface.

Wherein:

in S7, the process of photographing and analyzing data by the visual detection assembly includes the following sub-steps:

s7-1: the servo system sends a starting signal to an input point of the detection camera 9, an output point of the detection camera 9 controls the camera light source 7 to trigger, and the camera lens 8 shoots to obtain an image;

s7-2: firstly, carrying out edge comparison on the images through a halcon algorithm, and generating a preset rectangular frame shown in fig. 9 according to model information of the metal etching lead frame B, wherein the preset rectangular frame represents a specified detection area of an automatic defect detector on the metal etching lead frame B;

s7-3: carrying out algorithm processing on the image again to generate an actual rectangular frame as shown in fig. 9, wherein the actual rectangular frame represents an actual detection area of the metal etched lead frame B when the metal etched lead frame B is detected by an automatic defect detector;

s7-4: obtaining and counting the distance difference between the actual rectangular frame and the preset rectangular frame, wherein the frame deviation value is 0 as shown in fig. 9, namely the preset rectangular frame of the metal etched lead frame B coincides with the actual rectangular frame;

s7-5: generating an OK conclusion according to the distance difference value result counted in the step S7-4, further calculating the widths of the specified detection area and the actual detection area, and counting the difference value between the width of the specified detection area and the width of the actual detection area, wherein the width of the specified detection area and the width of the actual detection area are 6.82cm, and the difference value is 0 as shown in FIG. 9;

s7-6, generating an OK conclusion again according to the difference result counted in S7-5 and feeding back the conclusion to the industrial personal computer, wherein the OK conclusion represents that the positioning and leveling effect on the metal etched lead frame B is qualified.

Further, in the step S7-3, the process of generating the actual rectangular frame includes the following sub-steps:

s7-31: RGB-separating the image and converting the image into HSV components;

s7-32: performing threshold processing on the S component image, selecting a range of 45-120, and removing a black fixing device and a white vacuum part to form an ROI region;

s7-33: the inner edge of the ROI area is the actual rectangular frame.

Further, in the step S7-4, the specific method for obtaining the distance difference and performing statistics is to select 8 points at the lateral position of the actual rectangular frame, then calculate the distance between each point and the preset rectangular frame, and select the maximum distance for recording;

in the step S7-5, the difference value of the distance between the actual rectangular frame and the preset rectangular frame is lower than 0.05cm, and is an OK conclusion, or else, is an NG conclusion;

in the step S7-6, when the difference between the specified detection area width and the actual detection area width is lower than 0.02cm, an OK conclusion is reached, and otherwise, an NG conclusion is reached.

The process of processing the metal etched lead frame C is the same as the above process, and will not be described here again; however, the initial state of the metal etched lead frame C in the lead frame case is slightly deviated, so that it cannot be completely placed in the groove adsorption area of the lead frame fixture 4, and thus cannot be positioned and corrected normally, so that the detection conclusion of the metal etched lead frame C through the visual detection component is different from that of the metal etched lead frame B, and the specific detection process is as follows:

s7-1: the servo system sends a starting signal to an input point of the detection camera 9, an output point of the detection camera 9 controls the camera light source 7 to trigger, and the camera lens 8 shoots to obtain an image;

s7-2: firstly, carrying out edge comparison on images through a halcon algorithm, and generating a preset rectangular frame shown in fig. 10 according to model information of the metal etching lead frame C, wherein the preset rectangular frame represents a specified detection area of an automatic defect detector on the metal etching lead frame C;

s7-3: carrying out algorithm processing on the image again to generate an actual rectangular frame as shown in fig. 10, wherein the actual rectangular frame represents an actual detection area of the metal etched lead frame C when the metal etched lead frame C is detected by an automatic defect detector;

s7-4: obtaining and counting the distance difference between the actual rectangular frame and the preset rectangular frame, wherein the frame deviation value is 0.23 and is larger than 0.05cm as shown in fig. 10;

s7-5: and (3) generating an NG conclusion according to the distance difference value result counted in the step (S7-4), and feeding back the NG conclusion to the automatic defect detector through the industrial personal computer, wherein the NG conclusion represents that the positioning and leveling effects on the metal etched lead frame C are unqualified, and the automatic defect detector stops automatic detection and waits for an operator to check and process.

Of course, the foregoing is merely preferred embodiments of the present invention and is not to be construed as limiting the scope of the embodiments of the present invention. The present invention is not limited to the above examples, and those skilled in the art will appreciate that the present invention is capable of equally varying and improving within the spirit and scope of the present invention.

Claims (10)

1. The utility model provides a metal etching lead frame high accuracy location levelling device for realize that lead frame carries out the location levelling before the defect detection through automatic defect detection machine, its characterized in that: including servo, servo's servo motor (5) are fixed on fixing device support (6), and fixing device support (6) upper portion is equipped with the location and levels the subassembly, and location is leveled the subassembly below and is equipped with visual detection subassembly, servo, location leveling subassembly, visual detection subassembly all carry out data communication with the host computer.

2. The metal etched lead frame high precision positioning and leveling device according to claim 1, wherein: the positioning and leveling assembly comprises two parallel lead frame fixing devices (4), two sliding areas are arranged at two ends of each lead frame fixing device (4), and an adsorption area is arranged at the middle part of each lead frame fixing device (4).

3. The metal etched lead frame high precision positioning and leveling device according to claim 2, wherein: the outermost ends of the two sliding areas are respectively and slidably connected to two fixed plate sliding rails (1), and the two fixed plate sliding rails (1) are respectively arranged at the two ends of a fixing device bracket (6); the inside of the two sliding areas is respectively penetrated through the fixed plate screw rod (2), the fixed plate screw rod (2) is parallel to the fixed plate sliding rail (1), and screw rod gears (3) are arranged at two ends of the fixed plate screw rod (2).

4. The metal etched lead frame high precision positioning and leveling device according to claim 2, wherein: the adsorption area is internally provided with a fixed plate (4-3), one end of the fixed plate (4-3) is provided with a plurality of air pipe connection threaded holes (4-31), each air pipe connection threaded hole (4-31) is connected with one end of an internal vacuum pipeline (4-32) of the fixed plate, the other end of each internal vacuum pipeline (4-32) of the fixed plate is connected with a plurality of groove vacuum connectors (4-33), and each groove vacuum connector (4-33) is connected with eleven vacuum adsorption holes (4-35) formed in the side face of one groove adsorption area (4-34).

5. The metal etched lead frame high precision positioning and leveling device according to claim 4, wherein: the vacuum adsorption holes (4-35) are strip-shaped slotted holes, and one end of each vacuum adsorption hole (4-35) far away from the corresponding groove vacuum connection port (4-33) is provided with an arc-shaped slope; one side of the vacuum adsorption hole (4-35) extends into the groove adsorption area (4-34).

6. The metal etched lead frame high precision positioning and leveling device according to claim 1, wherein: the visual detection assembly comprises a detection camera (9), wherein the detection camera (9) is fixed on a camera support (10), and a camera lens (8) and a camera light source (7) are sequentially arranged on the detection camera (9).

7. A control method of a high-precision positioning and leveling device for a metal etched lead frame, which is applied to the positioning and leveling device according to any one of claims 1 to 6, and is characterized by comprising the following steps:

s1: the upper computer of the positioning and leveling device sends corresponding pulse signals to the servo system according to the model of the product to be detected;

s2: the servo system controls the servo motor (5) to operate so that the two lead frame fixing devices (4) do separation movement;

s3: the groove adsorption areas (4-34) on each lead frame fixing device (4) move along with the lead frame fixing devices (4) so that the interval distance between the groove adsorption areas (4-34) on two sides is continuously increased;

s4: when the interval distance between the groove adsorption areas (4-34) at two sides is 4mm more than the width of a product to be detected, the two lead frame fixing devices (4) stop moving, at the moment, the upper computer sends a feeding instruction to the automatic defect detector, and the feeding device of the automatic defect detector places the product to be detected on the groove adsorption areas (4-34);

s5: feeding back a completion instruction to the upper computer after feeding of the automatic defect detector is completed, and then starting vacuum by the lead frame fixing device (4) so that a product to be detected is adsorbed on the groove adsorption area (4-34) to realize preliminary positioning and leveling;

s6: after the vacuum 1S is started, the servo motor (5) drives the two lead frame fixing devices (4) to fold towards the middle, so that the separation distance between the groove adsorption areas (4-34) on the two sides is consistent with the width of a product to be detected, and accurate positioning and leveling are realized;

s7: the servo system sends a working signal to the visual detection component, the visual detection component shoots and analyzes the data to obtain a judgment result, and the upper computer displays the data and the result through the display interface; meanwhile, if the analysis result is that the positioning and leveling effect is qualified, the upper computer sends a working signal to the automatic defect detector; if the analysis result is that the positioning and leveling effect is not qualified, the upper computer displays an alarm signal through a display interface.

8. The control method of the metal etching lead frame high-precision positioning and leveling device according to claim 7, characterized in that: in S7, the process of photographing and analyzing data by the visual detection assembly includes the following sub-steps:

s7-1: the servo system sends a starting signal to an input point of the detection camera (9), an output point of the detection camera (9) controls the triggering of the camera light source (7), and the detection camera (9) shoots to obtain an image;

s7-2: firstly, carrying out edge comparison on the images through a halcon algorithm, and generating a preset rectangular frame according to the model of the product to be detected, wherein the preset rectangular frame represents a specified detection area of the product to be detected by an automatic defect detector;

s7-3: carrying out algorithm processing on the image again to generate an actual rectangular frame, wherein the actual rectangular frame represents an actual detection area of the product to be detected when the product to be detected is detected by the automatic defect detector;

s7-4: obtaining a distance difference value between an actual rectangular frame and a preset rectangular frame and carrying out statistics;

s7-5: generating OK or NG two conclusions according to the distance difference value result counted in the step S7-4, directly feeding the NG conclusion back to the upper computer, representing that the positioning leveling effect is unqualified, further calculating the widths of the specified detection area and the actual detection area for the OK conclusion, and counting the difference value between the width of the specified detection area and the width of the actual detection area;

s7-6, generating OK or NG two conclusions again according to the difference value result counted in the S7-5 and feeding back the conclusions to the upper computer, wherein the OK conclusions represent that the positioning leveling effect is qualified, and the NG conclusions represent that the positioning leveling effect is unqualified.

9. The control method of the metal etching lead frame high-precision positioning and leveling device according to claim 8, characterized in that: in the step S7-3, the process of generating the actual rectangular frame comprises the following substeps:

s7-31: RGB-separating the image and converting the image into HSV components;

s7-32: performing threshold processing on the S component image, selecting a range of 45-120, and removing a black fixing device and a white vacuum part to form an ROI region;

s7-33: the inner edge of the ROI area is the actual rectangular frame.

10. The control method of the metal etching lead frame high-precision positioning and leveling device according to claim 8, characterized in that:

in the step S7-4, the specific method for acquiring the distance difference and carrying out statistics is that a plurality of points are selected from the transverse positions of the actual rectangular frames, then the distance from each point to the preset rectangular frame is calculated, and the maximum distance is selected for recording;

in the step S7-5, the difference value of the distance between the actual rectangular frame and the preset rectangular frame is lower than 0.05cm, and is an OK conclusion, or else, is an NG conclusion;

in the step S7-6, when the difference between the specified detection area width and the actual detection area width is lower than 0.02cm, an OK conclusion is reached, and otherwise, an NG conclusion is reached.

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