Door lock assembly automatic production system based on stamping process

Abstract

The invention relates to the technical field of metal stamping, in particular to a door lock assembly automatic production system based on a stamping process, comprising a feeding module for feeding plates; the positioning module is used for limiting the position of the mold; the guide module is used for adjusting the position of the male die according to the offset and the change trend; the conveying module is used for moving the plate between the stamping stations; the stamping module is used for stamping the plate and adjusting the initial stamping force, the pressure threshold value and the stroke; the detection module is used for detecting the number of discharged pieces, the thickness of the plate, the depth of the plate, the coordinates of the mold and the blanking duration; and the analysis module is used for judging whether the current production efficiency meets the production requirements and reasons or not, analyzing the shear strength of the plate and the offset change degree of the die and judging whether the plate can be adjusted back to be punched again or not. The punching parameters are adjusted according to the shearing strength of the plate and the deviation change condition of the punched hole, and the production efficiency and the production precision are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of metal stamping, and in particular to an automated production system for door lock components based on a stamping process. Background Art

[0002] Stamping technology is widely used in the production of machinery, aviation, automobile, electronics, light industry, instrumentation and home appliances. The stamping process has the advantages of high survival rate, low production cost, high material utilization rate, ability to form complex parts, and suitability for mass production. It has replaced mechanical processing in some fields and is gradually expanding its process range. Therefore, stamping technology is of great significance to the development of production, enhancement of efficiency, and updating of products. With the continuous improvement of the quality of industrial products, stamping products are showing the characteristics of multiple varieties, small batches, complexity, large size, precision, and fast replacement speed. Stamping dies are developing in the direction of high efficiency, precision, long life and large size. Generally speaking, the material of the door lock refers to the material of the outer panel in the door lock assembly, which is also intuitively visible to consumers. The material and processing technology of the outer panel also directly determine the two important indicators of the firmness and durability of the outer panel, which is the most important embodiment of the appearance.

[0003] Chinese Patent Publication No.: CN109226410A discloses a punching device for a door lock inner ball, comprising a first punching machine, a second punching machine and a third punching machine, wherein the first punching machine is provided with a first die, the second punching machine is provided with a second, third and fourth die, the third punching machine is provided with a fifth and sixth die, the first punching machine is provided with a driving positioning mechanism for driving a sheet material to approach the first die, the driving positioning mechanism is provided with a storage area for storing a plurality of sheets, and the first die is provided with a positioning plate for contacting the sheet material; it can be seen that the punching device for a door lock inner ball has the following problems:

[0004] Only sheets of the same material can be processed, which limits production flexibility; the use of multiple steps and molds may increase the difficulty of quality control, and each step may cause certain errors or deviations, ultimately affecting the quality and consistency of the product. Summary of the invention

[0005] To this end, the present invention provides an automated production system for door lock components based on a stamping process, so as to overcome the problem in the prior art that only sheets of the same material can be processed, and each step may cause certain errors or deviations, ultimately affecting the quality and consistency of the product.

[0006] To achieve the above object, the present invention provides an automated production system for door lock components based on a stamping process, comprising:

[0007] A feeding module, which is connected to the conveying module and is used to convey the plate to the conveying module at an initial feeding speed for feeding;

[0008] A positioning module, which is connected to the stamping module and is used to limit the positions of the punch and the die in the stamping module;

[0009] A guide module, which is connected to the analysis module and the stamping module, and is used to adjust the position of the punch according to the amount of offset and the change trend of the offset when the punch and the die are offset during the stamping process;

[0010] A conveying module connected to the stamping module for moving the sheet between the stamping stations in an initial conveying cycle during the stamping process;

[0011] A stamping module includes a stamping station and a punch and a die corresponding to the stamping station, wherein the punch is used to stamp or punch a sheet, and the die is used to shape and form holes in the sheet. The stamping module is used to adjust the initial stamping force and the pressure threshold for stopping stamping according to the conversion coefficient of the sheet, adjust the stamping stroke according to the depth of the sheet, and adjust the blanking speed when the punch and the die may collide and rub;

[0012] A detection module, which is connected to the analysis module, includes a counter, a thickness gauge, a depth gauge, a coordinate measuring instrument and a timer, and is used to detect the number of output parts, the thickness of the plate, the depth of the plate, the coordinates of the center points of the punch and the center points of the die, and the duration of blanking, and transmits the data to the analysis module;

[0013] The analysis module is connected to the stamping module and is used to calculate the production efficiency of the door lock assembly according to the number of parts output and the number of defective parts, and to determine whether the current production efficiency can meet the production demand of the door lock assembly; calculate the actual defective rate and the actual production rate, and determine the reason for not meeting the production demand; calculate the actual conversion coefficient of the test piece plate, and determine the shear strength of the test piece plate; determine whether the plate can be called back and re-stamped according to the specific stamping situation of the test piece plate; determine the degree of change of the offset of the punch and the die during the punching process according to the coordinates of the center point of the punch and the center point of the die, and determine whether the punch and the die produce collision and friction according to the degree of change of the offset.

[0014] Furthermore, the detection module detects the number of output parts and the number of defective products of the production system within a unit production time, and the analysis module calculates the production efficiency of the door lock assembly according to the number of output parts and the number of defective products.

[0015] If the production efficiency is greater than or equal to the demand efficiency, the analysis module determines that the current production efficiency can meet the production demand for producing door lock components;

[0016] If the production efficiency is less than the demand efficiency, the analysis module determines that the current production efficiency cannot meet the production demand of the door lock assembly, and the analysis module analyzes the reasons for not meeting the production demand;

[0017] The demand efficiency is a preset value set according to production demand.

[0018] Furthermore, the analysis module calculates the actual defective rate. If the actual defective rate is less than or equal to the standard defective rate, the analysis module determines that the defective rate in the current production process is within a normal range, and the analysis module calculates the actual production rate.

[0019] If the actual defective rate is greater than the standard defective rate, the analysis module determines that the reason for not meeting the production demand is that the defective rate in the current production process is high, and the analysis module analyzes the offset generated in the punching process;

[0020] The analysis module calculates the actual production rate, which is equal to the number of pieces produced divided by the unit production time.

[0021] If the actual production rate is greater than or equal to the standard production rate, the analysis module determines that the actual production rate in the current production process is within a normal range;

[0022] If the actual production rate is lower than the standard production rate, the analysis module determines that the actual production rate in the current production process is slow, and the analysis module analyzes the shear strength of the sheet material punched during the punching process;

[0023] Among them, the standard defective rate is a preset value set according to the error rate of stamping, and the standard production rate is a preset value set according to production requirements.

[0024] Furthermore, the stamping module performs stamping on the specimen plate, and the order of stamping the specimen plate is first stamping, then stamping twice, and then punching;

[0025] The punching module punches the test piece plate at the first station once with an initial punching force, and the detection module detects the thickness of the test piece plate before and after punching;

[0026] The analysis module calculates the deformation difference of the specimen plate according to the thickness of the specimen plate before and after stamping, and calculates the actual conversion coefficient of the specimen plate according to the deformation difference of the specimen plate in one stamping and the initial stamping force.

[0027] If the actual conversion coefficient is less than the standard conversion coefficient corresponding to the standard shear strength, the analysis module determines that the shear strength of the specimen plate is greater, and the stamping module increases the initial stamping force of the primary stamping, the secondary stamping and the punching according to the ratio of the standard conversion coefficient to the actual conversion coefficient;

[0028] If the actual conversion coefficient is greater than the standard conversion coefficient corresponding to the standard shear strength, the analysis module determines that the shear strength of the specimen plate is small, and the stamping module reduces the initial stamping force of the first stamping, the second stamping and the punching according to the ratio of the standard conversion coefficient to the actual conversion coefficient.

[0029] The standard conversion coefficient is a preset value set according to the standard shear strength of the plate in the design.

[0030] Furthermore, after the shear strength of the specimen plate changes,

[0031] The detection module detects the processing parameters of the primary stamping and the secondary stamping, and the processing parameters of the primary stamping and the secondary stamping are the thickness and depth of the plate.

[0032] If the plate thickness is greater than the standard thickness, the analysis module determines that the plate can be called back for another stamping, and the stamping module increases the pressure threshold for stopping stamping according to the difference between the plate thickness and the standard thickness and the deformation difference of the test piece plate;

[0033] If the plate thickness is less than the standard thickness, the analysis module determines that the plate cannot be recalled for re-stamping, and the stamping module reduces the pressure threshold for stopping stamping according to the difference between the standard thickness and the plate thickness and the deformation difference of the test piece plate.

[0034] The standard thickness is a preset value set according to the design parameters of the outer panel.

[0035] Furthermore, the analysis module compares the plate depth with the standard depth.

[0036] If the plate depth is less than the standard depth, the analysis module determines that the plate can be called back for secondary stamping, and the stamping module increases the stroke of the secondary stamping according to the ratio of the standard depth to the plate depth;

[0037] If the plate depth is greater than the standard depth, the analysis module determines that the plate cannot be returned for secondary stamping, and the stamping module reduces the stroke of the secondary stamping according to the ratio of the standard depth to the plate depth.

[0038] The standard depth is a preset value set according to the design parameters of the outer panel.

[0039] Furthermore, the detection module detects the coordinates of the center point of the punch and the coordinates of the center point of the working hole on the die during the punching process, and the analysis module calculates the offset between the center point of the die and the center point of the punch, and calculates the vector between the center point of the die and the center point of the punch according to the coordinates of the center point of the die and the center point of the punch;

[0040] The analysis module draws an offset variation curve according to the offset, and obtains a derivative function of the variation curve.

[0041] If the offset of the offset change curve corresponding to any time point is greater than the critical error, the analysis module determines that the offset generated by the punching process is large, stops punching and issues an alarm signal;

[0042] If the offset of the offset variation curve corresponding to any time point is less than or equal to the critical error, the analysis module determines that the offset generated during the punching process is within the allowable error range and analyzes the variation trend of the generated offset.

[0043] Furthermore, the analysis module analyzes the variation trend of the generated offset.

[0044] If the derivative function value of the offset change curve corresponding to any time point is greater than zero, the analysis module determines that the offset generated during the punching process is increasing, and the guidance module adjusts the position of the punch according to the vector of the center point of the die and the center point of the punch and the offset;

[0045] If the derivative function value of the offset change curve corresponding to any time point is equal to zero, the analysis module determines that the initial position of the punch does not meet the requirements, and the guidance module adjusts the position of the punch according to the vector of the center point of the die and the center point of the punch and the offset;

[0046] The critical error is half of the error value allowed by the design of the handle hole and the key hole on the outer panel.

[0047] Furthermore, when the guide module adjusts the position of the punch, the detection module detects the blanking time before the die contacts the plate, and the analysis module calculates the adjustment time according to the offset and the adjustment speed of the guide module for adjusting the position of the punch.

[0048] If the adjustment time is longer than the blanking time, the analysis module determines that the punch and the die may collide and rub;

[0049] If the adjustment time is less than or equal to the blanking time, the analysis module determines that the punch and the die do not produce collision friction.

[0050] Furthermore, if the offset is increasing, the stamping module reduces the blanking speed of the punch according to the offset between the center point of the die and the center point of the punch and the derivative function value, and the blanking speed is negatively correlated with the offset and the derivative function value;

[0051] If the initial position of the punch does not meet the requirements, the stamping module reduces the blanking speed of the punch according to the offset between the center point of the die and the center point of the punch, and the blanking speed is negatively correlated with the offset.

[0052] Compared with the prior art, the beneficial effect of the present invention lies in that, in the automated production process of door lock assemblies, production efficiency is one of the important indicators for judging the production system. The present invention detects the number of outputs and the number of defective products, analyzes and predicts whether the production efficiency can meet the demand, and takes corresponding inspection measures in time, thereby reducing the impact of substandard production efficiency; by analyzing the reasons for not meeting production needs, further damage to production efficiency due to punching offset is avoided, manual workload is reduced, production costs are reduced, and the degree of automation in the production of door lock assemblies is improved.

[0053] Furthermore, in the prior art, there are many materials, especially metal materials, that can be used on door locks. Depending on the application on different accessories, the materials used are also different. The materials used on the panel mainly include plastic, stainless steel, iron, aluminum alloy, copper alloy and zinc alloy; the conversion coefficient of the material is calculated by stamping the test plate, the change of the shear strength of the test plate is judged, and the initial stamping force is adjusted according to the change of the shear strength, thereby improving the adaptability and flexibility for different plates in automated production; the present invention judges the specific stamping situation of the plate, adjusts the pressure threshold and the stamping stroke, and calls back the plate, thereby improving the accuracy of stamping the plate, reducing unnecessary plate waste caused by stamping errors, and further improving the degree of automation in production.

[0054] Furthermore, the deviation generated during stamping or punching affects the accuracy of the handle hole and the key hole on the outer panel. The present invention determines the offset amount and offset trend of the die and the punch, and adjusts the relative position of the mold during the falling process of the punch approaching the die, thereby reducing the degree of deviation between the die and the punch, reducing the impact of the deviation generated by punching on the accuracy of the produced door lock components, reducing the number of defective products, improving production efficiency and improving the accuracy of punching holes in the plate.

[0055] Furthermore, deviations during stamping or punching may cause unnecessary wear on the mold. The present invention quantifies the adjustment capability of the guide module by comparing the adjustment time and the blanking time, and adjusts the blanking speed of the punch according to the offset, thereby reducing the wear on the mold during the production process. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Figure 1 This is a unit connection diagram of a door lock assembly automated production system based on a stamping process in an embodiment of the present invention;

[0057] Figure 2 It is a schematic diagram of the main structure of the outer panel of the door lock assembly in an embodiment of the present invention;

[0058] Figure 3 It is a schematic diagram of the rear view structure of the outer panel of the door lock assembly in an embodiment of the present invention;

[0059] Figure 4 This is a flow chart of judging whether a mold may collide and rub according to the adjustment time in an embodiment of the present invention;

[0060] In the figure: 1-outer panel, 2-handle hole, 3-key hole. DETAILED DESCRIPTION

[0061] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0062] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0063] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0064] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0065] See also Figure 1-Figure 4 As shown, Figure 1 This is a unit connection diagram of a door lock assembly automated production system based on a stamping process in an embodiment of the present invention; Figure 2 It is a schematic diagram of the main structure of the outer panel of the door lock assembly in an embodiment of the present invention; Figure 3 It is a schematic diagram of the rear view structure of the outer panel of the door lock assembly in an embodiment of the present invention; Figure 4 This is a flow chart of determining whether a mold may collide and rub according to the adjustment time in an embodiment of the present invention.

[0066] The present invention provides an automated production system for door lock components based on a stamping process, comprising:

[0067] A feeding module, which is connected to the conveying module and is used to convey the plate to the conveying module at an initial feeding speed for feeding;

[0068] A positioning module, which is connected to the stamping module and is used to limit the positions of the punch and the die in the stamping module;

[0069] A guide module, which is connected to the analysis module and the stamping module, and is used to adjust the position of the punch according to the amount of offset and the change trend of the offset when the punch and the die are offset during the stamping process;

[0070] A conveying module connected to the stamping module for moving the sheet between the stamping stations in an initial conveying cycle during the stamping process;

[0071] A stamping module includes a stamping station and a punch and a die corresponding to the stamping station, wherein the punch is used to stamp or punch a sheet, and the die is used to shape and form holes in the sheet. The stamping module is used to adjust the initial stamping force and the pressure threshold for stopping stamping according to the conversion coefficient of the sheet, adjust the stamping stroke according to the depth of the sheet, and adjust the blanking speed when the punch and the die may collide and rub;

[0072] A detection module is connected to the analysis module to detect the offset, punch height, and plate thickness, including a counter, a thickness gauge, a depth gauge, a coordinate measuring instrument, and a timer, and is used to detect the number of parts output, plate thickness, plate depth, the coordinates of the punch center and the die center, and the blanking time, and transmit the data to the analysis module;

[0073] The analysis module is connected to the stamping module and is used to calculate the production efficiency of the door lock assembly according to the number of parts output and the number of defective parts, and determine whether the current production efficiency can meet the production demand of the door lock assembly; calculate the actual defective rate and the actual production rate, and determine the reason why the production demand is not met; calculate the actual conversion coefficient of the test piece plate, and determine the shear strength of the test piece plate; determine whether the plate can be called back and re-stamped according to the specific stamping situation of the test piece plate; determine the degree of change of the offset of the punch and the die during the punching process according to the coordinates of the center point of the punch and the center point of the die, and determine whether the punch and the die produce collision and friction according to the degree of change of the offset.

[0074] In this embodiment, the stamping process adopts a progressive die stamping method to automatically produce the outer panel 1 in the door lock assembly, and the guiding method of the guide module is a rear guide column guiding method.

[0075] Before the door lock assembly is automatically produced, a mold that meets the requirements is designed according to the shape and size parameters of the product and the properties of the metal material. The mold includes a concave mold and a convex mold.

[0076] Select appropriate metal sheets according to design requirements and perform pre-treatment such as cleaning and cutting.

[0077] In this embodiment, a mechanical press is used to stamp the plate, and the mechanical press comprises a first station, a second station and a third station, and a concave die designed according to the workpiece parameters is arranged at the bottom of any station, and a convex die designed according to the workpiece parameters is arranged above the station;

[0078] The first station, the second station and the third station and the corresponding concave and convex dies are used to perform three different stamping processes on the sheet material.

[0079] The first station and the corresponding concave and convex dies are used to punch the sheet to a standard thickness;

[0080] The second station and the corresponding concave and convex dies are used to punch the sheet metal to a standard depth;

[0081] The third workstation and the corresponding concave and convex dies are used to punch holes at the bottom of the plate, including a handle hole 2 and a key hole 3 .

[0082] During the automated production of door lock components, the detection module detects the number of outputs and defective products of the production system within a unit production time, and transmits the data to the analysis module;

[0083] The analysis module calculates the production efficiency of the door lock assembly according to the number of output parts and the number of defective parts, and compares the production efficiency with the demand efficiency. The production efficiency is equal to the number of output parts minus the number of defective parts divided by the unit production time.

[0084] If the production efficiency is greater than or equal to the demand efficiency, the analysis module determines that the current production efficiency can meet the production demand for producing door lock components;

[0085] If the production efficiency is less than the demand efficiency, the analysis module determines that the current production efficiency cannot meet the production demand for producing door lock components, and the analysis module analyzes the reasons for not meeting the production demand.

[0086] The demand efficiency is a preset value set according to production demand.

[0087] The analysis module calculates the actual defective rate, which is equal to the number of defective products divided by the unit production time.

[0088] If the actual defective rate is less than or equal to the standard defective rate, the analysis module determines that the defective rate in the current production process is within a normal range, and the analysis module calculates the actual production rate;

[0089] If the actual defective rate is greater than the standard defective rate, the analysis module determines that the reason for not meeting the production demand is that the defective rate in the current production process is high, and the analysis module analyzes the offset generated in the punching process.

[0090] The analysis module calculates the actual production rate, which is equal to the number of pieces produced divided by the unit production time.

[0091] If the actual production rate is greater than or equal to the standard production rate, the analysis module determines that the actual production rate in the current production process is within a normal range;

[0092] If the actual production rate is lower than the standard production rate, the analysis module determines that the actual production rate in the current production process is slow, and the analysis module analyzes the shear strength of the sheet material punched during the punching process.

[0093] Among them, the standard defective rate is a preset value set according to the error rate of stamping, and the standard production rate is a preset value set according to production requirements.

[0094] Specifically, in the automated production process of door lock components, production efficiency is one of the important indicators for judging the production system. The present invention detects the number of output parts and the number of defective products, analyzes and predicts whether the production efficiency can meet the demand, and takes corresponding inspection measures in time, thereby reducing the impact of substandard production efficiency; by analyzing the reasons for not meeting production needs, further damage to production efficiency due to punching offset is avoided, manual workload is reduced, production costs are reduced, and the degree of automation in the production of door lock components is improved.

[0095] The stamping module performs stamping on the specimen plate, and the order of stamping the specimen plate is first stamping, then stamping twice, and then punching;

[0096] The punching module punches the test piece plate at the first station once with an initial punching force, and the detection module uses a thickness gauge to detect the thickness of the test piece plate before and after punching;

[0097] The analysis module calculates the deformation difference of the specimen plate according to the thickness of the specimen plate before and after stamping, and the deformation difference is equal to the thickness of the specimen plate before stamping minus the thickness of the specimen plate after stamping;

[0098] The analysis module calculates the actual conversion coefficient of the specimen plate according to the deformation difference of the specimen plate in one punching and the initial punching force, and the actual conversion coefficient is equal to the deformation difference of the specimen plate divided by the initial punching force. The analysis module determines the shear strength of the specimen plate according to the actual conversion coefficient of the specimen plate;

[0099] If the actual conversion coefficient is less than the standard conversion coefficient corresponding to the standard shear strength, the analysis module determines that the shear strength of the specimen plate is greater, and the stamping module increases the initial stamping force of the primary stamping, the secondary stamping and the punching according to the ratio of the standard conversion coefficient to the actual conversion coefficient;

[0100] If the actual conversion coefficient is greater than the standard conversion coefficient corresponding to the standard shear strength, the analysis module determines that the shear strength of the specimen plate is small, and the stamping module reduces the initial stamping force of the first stamping, the second stamping and the punching according to the ratio of the standard conversion coefficient to the actual conversion coefficient.

[0101] The standard conversion coefficient is a preset value set according to the standard shear strength of the plate in the design.

[0102] After the shear strength of the test piece sheet changes, the detection module detects the processing parameters of the primary stamping and the secondary stamping, the processing parameters of the primary stamping and the secondary stamping are the sheet thickness and the sheet depth, the detection module uses a depth gauge to detect the sheet depth of the test piece, and the analysis module determines the specific stamping condition of the sheet;

[0103] The analysis module compares the plate thickness with the standard thickness.

[0104] If the plate thickness is greater than the standard thickness, the analysis module determines that the plate can be called back for another stamping, and the stamping module increases the pressure threshold for stopping stamping according to the difference between the plate thickness and the standard thickness and the deformation difference of the test piece plate;

[0105] If the plate thickness is less than the standard thickness, the analysis module determines that the plate cannot be recalled for re-stamping, and the stamping module reduces the pressure threshold for stopping stamping according to the difference between the standard thickness and the plate thickness and the deformation difference of the test piece plate.

[0106] The standard thickness is a preset value set according to the design parameters of the outer panel 1 .

[0107] The analysis module compares the plate depth with the standard depth.

[0108] If the plate depth is less than the standard depth, the analysis module determines that the plate can be called back for secondary stamping, and the stamping module increases the stroke of the secondary stamping according to the ratio of the standard depth to the plate depth;

[0109] If the plate depth is greater than the standard depth, the analysis module determines that the plate cannot be returned for secondary stamping, and the stamping module reduces the stroke of the secondary stamping according to the ratio of the standard depth to the plate depth.

[0110] The standard depth is a preset value set according to the design parameters of the outer panel 1 .

[0111] Specifically, in the prior art, there are many materials, especially metal materials, that can be used on door locks. Depending on the application on different accessories, the materials used are also different. The materials used on the panel mainly include plastic, stainless steel, iron, aluminum alloy, copper alloy and zinc alloy; the conversion coefficient of the material is calculated by stamping the test plate, the change of the shear strength of the test plate is judged, and the initial stamping force is adjusted according to the change of the shear strength, thereby improving the adaptability and flexibility for different plates in automated production; the present invention judges the specific stamping situation of the plate, adjusts the pressure threshold and the stamping stroke, and calls back the plate, thereby improving the accuracy of stamping the plate, reducing unnecessary plate waste caused by stamping errors, and further improving the degree of automation in production.

[0112] In the case of a high defective rate, the analysis module determines that the punching accuracy is low and analyzes the offset generated during the punching process.

[0113] When punching, a guide device is provided on the punch to enhance the punching accuracy of the punch;

[0114] The detection module uses a coordinate measuring machine to detect the coordinates of the center point of the punch and the center point of the working hole on the die during the punching process.

[0115] The analysis module calculates the offset between the center point of the die and the center point of the punch, and calculates the vector of the center point of the die and the center point of the punch according to the coordinates of the center point of the die and the center point of the punch.

[0116] The offset is equal to the straight-line distance between the coordinates of the center point of the die and the center point of the punch.

[0117] The analysis module draws an offset variation curve according to the offset, and obtains a derivative function of the variation curve.

[0118] If the offset of the offset change curve corresponding to any time point is greater than the critical error, the analysis module determines that the offset generated by the punching process is large, stops punching and issues an alarm signal;

[0119] If the offset of the offset change curve corresponding to any time point is less than or equal to the critical error, the analysis module determines that the offset generated during the punching process is within the allowable error range, and analyzes the change trend of the generated offset.

[0120] If the derivative function value of the offset change curve corresponding to any time point is greater than zero, the analysis module determines that the offset generated during the punching process is increasing, and the guidance module adjusts the position of the punch according to the vector of the center point of the die and the center point of the punch and the offset;

[0121] If the derivative function value of the offset change curve corresponding to any time point is equal to zero, the analysis module determines that the initial position of the punch does not meet the requirements, and the guidance module adjusts the position of the punch according to the vector and offset of the center point of the die and the center point of the punch.

[0122] The critical error is half of the error value allowed by the design of the handle hole 2 and the key hole 3 on the outer panel 1.

[0123] Specifically, the deviation generated during stamping or punching affects the accuracy of the handle hole and the key hole on the outer panel. The present invention determines the offset amount and offset trend of the die and the punch, and adjusts the relative position of the mold during the falling process of the punch approaching the die, thereby reducing the degree of deviation between the die and the punch, reducing the impact of the deviation generated by punching on the accuracy of the produced door lock components, reducing the number of defective products, improving production efficiency and improving the accuracy of punching holes in the plate.

[0124] When the guide module adjusts the position of the punch, the detection module detects the blanking time before the die contacts the plate, and the analysis module calculates the adjustment time according to the offset and the adjustment speed of the guide module for adjusting the position of the punch.

[0125] If the adjustment time is longer than the blanking time, the analysis module determines that the punch and the die may collide and rub;

[0126] When the offset is increasing, the stamping module reduces the blanking speed of the punch according to the offset between the center point of the die and the center point of the punch and the derivative function value, and the blanking speed is negatively correlated with the offset and the derivative function value;

[0127] When the initial position of the punch does not meet the requirements, the stamping module reduces the blanking speed of the punch according to the offset between the center point of the die and the center point of the punch, and the blanking speed is negatively correlated with the offset.

[0128] Specifically, deviations during stamping or punching will cause unnecessary wear on the mold. The present invention quantifies the adjustment ability of the guide module by comparing the adjustment time and the blanking time, and adjusts the blanking speed of the punch according to the offset, thereby reducing the wear on the mold during the production process.

[0129] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

[0130] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An automated production system for door lock components based on stamping technology, characterized in that: include: A feeding module, which is connected to the conveying module and is used to convey the plate to the conveying module at an initial feeding speed for feeding; A positioning module, which is connected to the stamping module and is used to limit the positions of the punch and die in the stamping module; A guide module, which is connected to the analysis module and the stamping module, and is used to adjust the position of the punch according to the amount of offset and the change trend of the offset when the punch and the die are offset during the stamping process; A conveying module connected to the stamping module for moving the sheet between the stamping stations in an initial conveying cycle during the stamping process; A stamping module includes a stamping station and a punch and a die corresponding to the stamping station, wherein the punch is used to stamp or punch a sheet, and the die is used to shape and form holes in the sheet. The stamping module is used to adjust the initial stamping force and the pressure threshold for stopping stamping according to the conversion coefficient of the sheet, adjust the stamping stroke according to the depth of the sheet, and adjust the blanking speed when the punch and the die may collide and rub; A detection module, which is connected to the analysis module, includes a counter, a thickness gauge, a depth gauge, a coordinate measuring instrument and a timer, and is used to detect the number of output parts, the thickness of the plate, the depth of the plate, the coordinates of the center points of the punch and the center points of the die, and the duration of blanking, and transmits the data to the analysis module; The analysis module is connected to the stamping module and is used to calculate the production efficiency of the door lock assembly according to the number of parts output and the number of defective parts, and to determine whether the current production efficiency can meet the production demand of the door lock assembly; calculate the actual defective rate and the actual production rate, and determine the reason for not meeting the production demand; calculate the actual conversion coefficient of the test piece plate, and determine the shear strength of the test piece plate; determine whether the plate can be called back and re-stamped according to the specific stamping situation of the test piece plate; determine the degree of change of the offset of the punch and the die during the punching process according to the coordinates of the center point of the punch and the center point of the die, and determine whether the punch and the die produce collision and friction according to the degree of change of the offset.

2. The door lock assembly automated production system based on stamping process according to claim 1, characterized in that: The detection module detects the number of output parts and the number of defective products of the production system within a unit production time, and the analysis module calculates the production efficiency of the door lock assembly according to the number of output parts and the number of defective products. If the production efficiency is greater than or equal to the demand efficiency, the analysis module determines that the current production efficiency can meet the production demand for producing door lock components; If the production efficiency is less than the demand efficiency, the analysis module determines that the current production efficiency cannot meet the production demand of the door lock assembly, and the analysis module analyzes the reasons for not meeting the production demand; The demand efficiency is a preset value set according to production demand.

3. The automatic production system of door lock components based on stamping process according to claim 2 is characterized in that: The analysis module calculates the actual defective rate. If the actual defective rate is less than or equal to the standard defective rate, the analysis module determines that the defective rate in the current production process is within a normal range, and the analysis module calculates the actual production rate. If the actual defective rate is greater than the standard defective rate, the analysis module determines that the reason for not meeting the production demand is that the defective rate in the current production process is high, and the analysis module analyzes the offset generated in the punching process; The analysis module calculates the actual production rate, which is equal to the number of pieces produced divided by the unit production time. If the actual production rate is greater than or equal to the standard production rate, the analysis module determines that the actual production rate in the current production process is within a normal range; If the actual production rate is lower than the standard production rate, the analysis module determines that the reason for not meeting the production demand is that the actual production rate in the current production process is slow, and the analysis module analyzes the shear strength of the sheet material punched during the punching process; Among them, the standard defective rate is a preset value set according to the error rate of stamping, and the standard production rate is a preset value set according to production requirements.

4. The automatic production system of door lock components based on stamping process according to claim 3 is characterized in that: The stamping module stamps the specimen plate, and the order of stamping the specimen plate is first stamping, then stamping twice, and then punching; The punching module punches the test piece plate at the first station once with an initial punching force, and the detection module detects the thickness of the test piece plate before and after punching; The analysis module calculates the deformation difference of the specimen plate according to the thickness of the specimen plate before and after stamping, and calculates the actual conversion coefficient of the specimen plate according to the deformation difference of the specimen plate in one stamping and the initial stamping force. If the actual conversion coefficient is less than the standard conversion coefficient corresponding to the standard shear strength, the analysis module determines that the shear strength of the specimen plate is greater, and the stamping module increases the initial stamping force of the primary stamping, the secondary stamping and the punching according to the ratio of the standard conversion coefficient to the actual conversion coefficient; If the actual conversion coefficient is greater than the standard conversion coefficient corresponding to the standard shear strength, the analysis module determines that the shear strength of the specimen plate is small, and the stamping module reduces the initial stamping force of the primary stamping, the secondary stamping and the punching according to the ratio of the standard conversion coefficient to the actual conversion coefficient; The standard conversion coefficient is a preset value set according to the standard shear strength of the plate in the design.

5. The automatic production system of door lock components based on stamping process according to claim 4 is characterized in that: After the shear strength of the specimen plate changes, The detection module detects the processing parameters of the primary stamping and the secondary stamping, and the processing parameters of the primary stamping and the secondary stamping are the thickness and depth of the plate. If the plate thickness is greater than the standard thickness, the analysis module determines that the specimen plate can be recalled for another stamping, and the stamping module increases the pressure threshold for stopping stamping according to the difference between the plate thickness and the standard thickness and the deformation difference of the specimen plate; If the plate thickness is less than the standard thickness, the analysis module determines that the sample plate cannot be recalled for re-stamping, and the stamping module reduces the pressure threshold for stopping stamping once according to the difference between the standard thickness and the plate thickness and the deformation difference of the sample plate; The standard thickness is a preset value set according to the design parameters of the outer panel.

6. The automatic production system of door lock components based on stamping process according to claim 5 is characterized in that: The analysis module compares the plate depth with the standard depth. If the plate depth is less than the standard depth, the analysis module determines that the test plate can be called back for a second stamping, and the stamping module increases the stroke of the second stamping according to the ratio of the standard depth to the plate depth; If the plate depth is greater than the standard depth, the analysis module determines that the test plate cannot be called back for secondary stamping, and the stamping module reduces the stroke of the secondary stamping according to the ratio of the standard depth to the plate depth; The standard depth is a preset value set according to the design parameters of the outer panel.

7. The automatic production system of door lock components based on stamping process according to claim 3 is characterized in that: The detection module detects the coordinates of the center point of the punch and the coordinates of the center point of the working hole on the die during the punching process, and the analysis module calculates the offset between the center point of the die and the center point of the punch, and calculates the vector of the center point of the die and the center point of the punch according to the coordinates of the center point of the die and the center point of the punch; The analysis module draws an offset variation curve according to the offset, and obtains a derivative function of the variation curve. If the offset of the offset change curve corresponding to any time point is greater than the critical error, the analysis module determines that the offset generated by the punching process is large, stops punching and issues an alarm signal; If the offset of the offset variation curve corresponding to any time point is less than or equal to the critical error, the analysis module determines that the offset generated during the punching process is within the allowable error range, and analyzes the variation trend of the generated offset; The critical error is half of the error value allowed by the design of the handle hole and the key hole of the outer panel.

8. The automatic production system of door lock components based on stamping process according to claim 7 is characterized in that: The analysis module analyzes the variation trend of the generated offset. If the derivative function value of the offset change curve corresponding to any time point is greater than zero, the analysis module determines that the offset generated during the punching process is increasing, and the guidance module adjusts the position of the punch according to the vector of the center point of the die and the center point of the punch and the offset; If the derivative function value of the offset change curve corresponding to any time point is equal to zero, the analysis module determines that the initial position of the punch does not meet the requirements, and the guidance module adjusts the position of the punch according to the vector and offset of the center point of the die and the center point of the punch.

9. The automatic production system of door lock components based on stamping process according to claim 8, characterized in that: When the guide module adjusts the position of the punch, the detection module detects the blanking time before the die contacts the plate, and the analysis module calculates the adjustment time according to the offset and the adjustment speed of the guide module adjusting the position of the punch. If the adjustment time is longer than the blanking time, the analysis module determines that the punch and die may collide and rub; If the adjustment time is less than or equal to the blanking time, the analysis module determines that the punch and the die do not produce collision friction.

10. The automatic production system of door lock components based on stamping process according to claim 9, characterized in that: When the analysis module determines that the punch and die may collide and rub, If the offset is increasing, the stamping module reduces the blanking speed of the punch according to the offset between the center point of the die and the center point of the punch and the derivative function value, and the blanking speed is negatively correlated with the offset and the derivative function value; If the initial position of the punch does not meet the requirements, the stamping module reduces the blanking speed of the punch according to the offset between the center point of the die and the center point of the punch, and the blanking speed is negatively correlated with the offset.

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