Method for manufacturing precision die for gearbox parts

Abstract

The invention relates to the technical field of metal pressing, in particular to a precise mold manufacturing method for gearbox parts, which comprises the following steps: automatically feeding at an initial feeding speed and detecting raw materials; feeding is conducted at the initial pushing frequency, and the raw materials are conveyed into a first station, a second station and a third station; the pressure borne by the raw materials in any station is calculated, the machining working condition is judged, and machining parameters are adjusted according to the machining working condition; according to the number of the stations not meeting the working conditions, whether the material of the to-be-machined raw material changes or not is judged, the deformation coefficient of the raw material is calculated, and the initial pressure value of a stamping head is correspondingly adjusted; according to the adjustment condition of the machining parameters of the stamping head, whether the adjusted machining efficiency meets the machining requirement or not is judged, the stamping duration difference value between the procedures is calculated, and the stamping period, the circulation period and the pushing frequency are correspondingly adjusted; and the workpieces are conveyed to the discharging opening to be discharged. The precision of the gearbox part manufacturing process is improved by conducting multi-station automatic machining on raw materials.

Description

Technical Field

[0001] The invention relates to the technical field of metal pressing, and in particular to a method for manufacturing a precision mold for gearbox parts. Background Art

[0002] Gearbox parts usually bear large mechanical and thermal loads, so the mold material needs to have high hardness, high strength, high wear resistance and good thermal stability. Commonly used mold materials include high-speed steel, cemented carbide, mold steel, etc. With the development of technology and changes in market demand, the design and manufacturing process of gearbox parts are also constantly updated. Therefore, the mold also needs to be updated accordingly to meet new production needs.

[0003] Chinese patent publication number: CN116803595A discloses a method for manufacturing an eccentric wheel for a high-pressure pump, wherein a blank is obtained by cutting a material through a sawing machine, and after the blank is annealed and softened, shot blasted to remove oxide scale, and phosphating-saponification treatment, a die frame and a mold are set on a crank-type cold forging press and corresponding process steps are performed to prepare a high-pressure pump eccentric wheel comprising a hollow cylinder and a flange offset from the center of the hollow cylinder; it can be seen that the method for manufacturing an eccentric wheel for a high-pressure pump has the following problems: Only one stamping operation can be completed at a time, the production efficiency is relatively low, and manual mold replacement is usually required between each process. The degree of automation is low and the labor intensity is high. Summary of the invention

[0004] To this end, the present invention provides a precision mold manufacturing method for gearbox parts, which is used to overcome the problems in the prior art that only one stamping operation can be completed at a time, the production efficiency is relatively low, and the mold usually needs to be manually replaced between each process, the degree of automation is low, and the labor intensity is high.

[0005] To achieve the above object, the present invention provides a method for manufacturing a precision mold for a gearbox part, comprising: Step S1, automatically loading materials at an initial loading speed, detecting the weight and size of the raw materials, and issuing a warning message if unqualified raw materials are detected; Step S2, feeding qualified raw materials at an initial pushing frequency, and pushing the raw materials to the feed inlet and into the conveying device; Step S3, the conveying device conveys the raw materials to the first station, the second station and the third station according to the cycle, and performs a stamping process on the raw materials to be processed; Step S4, calculating the pressure borne by the raw material in any station during the stamping process, determining the processing condition of the raw material in any station, and adjusting the processing parameters of the punch head in any station according to the processing condition of any station; Step S5, judging whether the material of the raw material to be processed has changed according to the number of stations that do not meet the processing conditions, calculating the deformation coefficient of the raw material in the first station, and adjusting the initial pressure values ​​of the punch heads corresponding to the three stations accordingly; Step S6, judging whether the efficiency of processing the raw material after adjustment meets the processing requirements according to the adjustment of the processing parameters of the punch head, calculating the difference in the punching time between any processes, and adjusting the punching cycle of the punch head, the cycle of the conveying device, and the pushing frequency of the pushing device accordingly; Step S7, the conveying device conveys the processed workpiece to the discharge port for discharge.

[0006] Further, the first punch pressure, the second punch pressure and the third punch pressure borne by the punch head and the first bottom column pressure, the second bottom column pressure and the third bottom column pressure borne by the bottom column are detected, Calculate the first, second and third pressure differences between the punch pressure and the bottom column pressure, and compare the pressure difference with the standard pressure difference range. If any pressure difference exceeds the corresponding standard pressure difference range, it is judged that the pressure on the raw material is relatively large, and the processing of the raw material by the punch head in the corresponding workstation does not meet the processing conditions.

[0007] Further, if any pressure difference value is the first pressure difference value, it is determined that the thickness of the raw material after being stamped during the stamping process is small; If any pressure difference value is the second pressure difference value, it is determined that the depth of the raw material after being punched during the punching process is large; If any pressure difference value is the third pressure difference value, it is determined that the depth of the cylindrical protrusion generated after the bottom of the raw material is punched during the punching process is relatively large.

[0008] Further, if any pressure difference is the first pressure difference, the pressure threshold at which the first punch stops punching is reduced according to the ratio of the standard pressure difference range to the first pressure difference; If any pressure difference is the second pressure difference, reducing the punching speed of the second punch according to the ratio of the standard pressure difference range to the second pressure difference; If any pressure difference is the third pressure difference, the initial height of the third punch is increased according to the ratio of the third pressure difference to the standard pressure difference range.

[0009] Further, if the first pressure difference value, the second pressure difference value and the third pressure difference value all exceed the corresponding standard pressure difference range, it is determined that the material of the raw material to be processed has changed, and the hardness of the changed raw material is lower than the initial pressure range of the mechanical press set according to the raw material; The deformation difference of the raw material generated at the first station is calculated, and the stroke length of the first punch during the punching process is detected according to the descending length of the first punch, and the deformation difference is equal to the stroke length.

[0010] Further, a conversion coefficient of the raw material at the first station is calculated according to the deformation difference and the first pressure difference, wherein the conversion coefficient is a conversion coefficient of pressure and deformation, and the conversion coefficient is equal to a ratio of the first pressure difference to the deformation difference; The initial pressure values ​​of the three punches in the mechanical press for punching the raw materials are adjusted according to the conversion coefficient and the processing parameters required for the raw materials. The adjusted initial pressure values ​​are equal to the product of the conversion coefficient of the raw materials, the processing parameters and the expression parameters.

[0011] Further, after reducing the punching speed of the second punch, the actual discharge speed of the workpiece is calculated according to the conveying cycle of the conveying device. If the discharge speed is less than the preset discharge speed, it is determined that the discharge speed cannot meet the production requirements of processing the raw material into the workpiece. Detect the first stamping time, the second stamping time and the third stamping time of the stamping head, calculate the first time difference, the second time difference and the third time difference between the stamping time, and compare any time difference with the time evaluation value.

[0012] Furthermore, if the first duration difference and the third duration difference are greater than the duration evaluation value, and the first punching duration is greater than the second punching duration and the third duration difference, it is determined that the first punching duration of the first punch is too long. The second punch and the third punch have a long waiting time, and the punching speed of the first punch is increased according to the ratio of the first time difference to the time evaluation value; If the difference between the second punching time and the third punching time is greater than the time evaluation value, and the third punching time is greater than the difference between the first time and the second time, then it is judged that the third punching time of the third punch is too long. There is a longer waiting time between the second punch and the first punch, and the punching speed of the third punch is increased according to the ratio of the third time difference to the time evaluation value.

[0013] Furthermore, if the difference between the first punching time and the second punching time is greater than the time evaluation value, and the second punching time is greater than the difference between the first punching time and the third punching time, it is determined that the second punching time of the second punch is too long. The third punch and the first punch have a longer waiting time. The punching cycle of the punch head is reduced according to the ratio of the preset discharge speed to the actual discharge speed, the cycle of the conveying device is correspondingly reduced, and the pushing frequency of the pushing device is increased.

[0014] Furthermore, if the actual discharge speed after adjustment is still lower than the preset discharge speed, the stamping cycle of the punch head is reduced according to the ratio of the preset discharge speed to the actual discharge speed after adjustment; If any time difference is less than or equal to the time evaluation value, it is judged that the stamping time of the punch head is relatively close, and the stamping cycle of the punch head is reduced according to the ratio of the preset discharge speed to the actual discharge speed.

[0015] Compared with the prior art, the beneficial effect of the present invention is that when judging the working conditions during the raw material processing, the pressure sensor set on the punch head is often used to detect the reaction force on the punch head to judge the pressure size. Such a detection method is affected by the movement of the punch head and is not accurate enough. In the process of the punch head punching the raw material, part of the pressure applied by the punch head is converted into the force between the molecules of the raw material. This method divides the processing of the raw material into three processes, each process corresponds to a workstation, and the stamping operations of the three processes in the three workstations can be completed at the same time, which increases the production efficiency, automation and consistency of the finished workpiece; by calculating the pressure difference between the punch head and the bottom column in the same workstation, the working conditions of each process in the raw material processing process are judged, and the processing parameters of the punch head are adjusted according to the working conditions of the process, which improves the accuracy of raw material processing.

[0016] Furthermore, in the process of stamping the raw materials, the material of the raw materials may change, and the stamping is greatly affected by the hardness of the raw materials. If the hardness of the raw materials is not judged, it will have a serious impact on the processing conditions of each processing step, reducing the yield of workpieces in the parts manufacturing process. The method judges the material changes of the raw materials to be processed according to the number of workstations that do not meet the processing conditions, and calculates the conversion coefficient of the raw materials. According to the processing parameters, the initial pressure values ​​of the three punches in the mechanical press during the stamping of the raw materials are adjusted accordingly, thereby further improving the processing accuracy and processing quality, reducing the scrap rate and rework rate in the processing process, and thus reducing the processing cost.

[0017] Furthermore, adjusting the process parameters of the device will affect the processing efficiency of the device. If the processing efficiency is not judged, the production schedule will be delayed; the waiting conditions of different stamping processes between the workstations are judged according to the difference in stamping time between the punches, and the waiting time between the processes is reduced by increasing the stamping speed, thereby improving the processing efficiency; by reducing the stamping cycle and correspondingly reducing the cycle cycle of the conveying device, the pushing frequency of the pushing device is increased, thereby further improving the processing efficiency; the second workstation is more critical to the processing of raw materials, and the processing process has a higher priority. By avoiding adjusting the stamping parameters of the second punch, the stability of the raw material processing is increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a flowchart of the steps of the method for manufacturing a precision mold for a gearbox part in an embodiment of the present invention; Figure 2 It is a schematic structural diagram of a three-station mechanical punching machine in an embodiment of the present invention; Figure 3 is a schematic side cross-sectional view of a workpiece in an embodiment of the present invention; Figure 4 is a schematic top cross-sectional view of a workpiece in an embodiment of the present invention; In the figure: 1-stamping table, 2-raw material, 3-workpiece, 11-first punch, 12-second punch, 13-third punch, 21-first bottom column, 22-second bottom column, 23-third bottom column. DETAILED DESCRIPTION

[0019] 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.

[0020] 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.

[0021] 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.

[0022] 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.

[0023] See also Figure 1-Figure 4 As shown, Figure 1 It is a flowchart of the steps of the method for manufacturing a precision mold for a gearbox part in an embodiment of the present invention; Figure 2 It is a schematic structural diagram of a three-station mechanical punching machine in an embodiment of the present invention; Figure 3 is a schematic side cross-sectional view of a workpiece in an embodiment of the present invention; Figure 4 It is a schematic top cross-sectional view of a workpiece in an embodiment of the present invention.

[0024] The present invention provides a method for manufacturing a precision mold for a gearbox part, comprising: Step S1, automatically loading materials at an initial loading speed, detecting the weight and size of the raw materials, and issuing a warning message if unqualified raw materials are detected; Step S2, feeding qualified raw materials at an initial pushing frequency, and pushing the raw materials to the feed inlet and into the conveying device; Step S3, the conveying device conveys the raw materials to the first station, the second station and the third station according to the cycle, and performs a stamping process on the raw materials to be processed; Step S4, calculating the pressure borne by the raw material in any station during the stamping process, determining the processing condition of the raw material in any station, and adjusting the processing parameters of the punch head in any station according to the processing condition of any station; Step S5, judging whether the material of the raw material to be processed has changed according to the number of stations that do not meet the processing conditions, calculating the deformation coefficient of the raw material in the first station, and adjusting the initial pressure values ​​of the punch heads corresponding to the three stations accordingly; Step S6, judging whether the efficiency of processing the raw material after adjustment meets the processing requirements according to the adjustment of the processing parameters of the punch head, calculating the difference in the punching time between any processes, and adjusting the punching cycle of the punch head, the cycle of the conveying device, and the pushing frequency of the pushing device accordingly; Step S7, the process of processing the raw material into the workpiece is completed, and the conveying device conveys the processed workpiece to the discharge port for discharge.

[0025] In this embodiment, the pushing device for pushing the raw material 2 is a pushing rod and a feeding rod. The push rod and the feed rod feed at an initial pushing frequency. The push rod pushes the raw material 2 to the edge of the feed table, and the feed rod delivers the raw material 2 to the feed port of the feed table.

[0026] In this embodiment, the method for detecting the weight and size of the raw material 2 is as follows: The diameter of the raw material 2 is calculated according to the moving distance of the push rod, the weight of the raw material 2 is calculated according to the pressure on the push rod, the difference between the weight and diameter and the standard weight and diameter is calculated, and whether it is within the allowable error value range is evaluated to determine whether the raw material 2 is qualified, and a warning signal is issued if the raw material 2 is unqualified; If the difference between the moving distance of the push rod and the preset standard distance is close to the standard diameter of the raw material 2, it is judged that the material is empty, an emergency warning signal is issued, and the processing is stopped after the current processing step is completed.

[0027] It is understandable that the loading speed can be increased by adjusting the initial pushing frequency, and the initial pushing frequency is positively correlated with the circulation speed of the conveying device.

[0028] In this embodiment, a mechanical press is used to stamp the raw material 2. The mechanical press comprises a first station, a second station and a third station. A first bottom column 21, a second bottom column 22 and a third bottom column 23 are arranged at the bottom of the station. The corresponding punching heads arranged above the station include a first punch 11, a second punch 12 and a third punch 13. The first punch 11, the second punch 12 and the third punch 13 are fixedly connected under the same punching platform 1, and are simultaneously lowered and lifted under the drive of the punching platform 1; The first station, the second station and the third station and the first punch 11, the second punch 12 and the third punch 13 are used to perform three different stamping processes on the raw material 2. The first station and the first punch 11 are used to punch the raw material 2 to a standard thickness; The second station and the second punch 12 are used to punch the raw material 2 into a cylindrical shape; The third workstation and the third punch 13 are used to punch out a cylindrical protrusion at the bottom of the raw material 2 .

[0029] In the process of processing the raw material 2, the first punch pressure, the second punch pressure and the third punch pressure borne by the first punch 11, the second punch 12 and the third punch 13 in the process of processing the raw material 2 are detected in real time; Detecting the first bottom column pressure, the second bottom column pressure and the third bottom column pressure borne by the first bottom column 21, the second bottom column 22 and the third bottom column 23; Calculate a first pressure difference between the first punch pressure and the first bottom column pressure, a second pressure difference between the second punch pressure and the second bottom column pressure, and a third pressure difference between the third punch pressure and the third bottom column pressure, The first pressure difference is compared with the first standard pressure difference range, the second pressure difference is compared with the second standard pressure difference range, and the third pressure difference is compared with the third standard pressure difference range. If any pressure difference exceeds the corresponding standard pressure difference range, it is judged that the pressure on the raw material 2 is relatively large, and the processing of the raw material 2 by the punch head in the corresponding station does not meet the processing conditions; If any pressure difference is the first pressure difference, it is determined that the thickness of the raw material 2 after being punched during the punching process is small, and the pressure threshold for stopping the punching of the first punch 11 is reduced according to the ratio of the standard pressure difference range to the first pressure difference; If any pressure difference is the second pressure difference, it is determined that the depth of the raw material 2 after being punched during the punching process is large, and the punching speed of the second punch 12 is reduced according to the ratio of the standard pressure difference range to the second pressure difference; If any pressure difference is the third pressure difference, it is determined that the depth of the cylindrical protrusion produced after the bottom of the raw material 2 is punched during the punching process is large, and the initial height of the third punch 13 is increased according to the ratio of the third pressure difference to the standard pressure difference range.

[0030] Specifically, when judging the working condition of the raw material 2 during processing, the pressure sensor set on the punch head is often used to detect the reaction force on the punch head to judge the pressure size. This detection method is affected by the movement of the punch head and is not accurate enough. In the process of the punch head punching the raw material 2, part of the pressure applied by the punch head is converted into the force between the molecules of the raw material 2. This method divides the processing of the raw material 2 into three processes, each process corresponds to a workstation, and the stamping operation of the three processes in the three workstations can be completed at the same time, which increases the production efficiency, automation and consistency of the finished workpiece 3; by calculating the pressure difference between the punch head and the bottom column in the same workstation, the working condition of each process in the processing of the raw material 2 is judged, and the processing parameters of the punch head are adjusted according to the working conditions of the process, which improves the accuracy of processing the raw material 2.

[0031] If the first pressure difference, the second pressure difference and the third pressure difference all exceed the corresponding standard pressure difference range, it is determined that the material of the raw material 2 to be processed has changed, and the hardness of the changed raw material 2 is lower than the initial pressure range of the mechanical press set according to the raw material. Detecting the stroke length of the first punch 11 during the punching process of the raw material 2 according to the descending length of the first punch 11, wherein the stroke length is equal to the deformation difference of the raw material 2; And calculating the conversion coefficient of the raw material 2 at the first station according to the deformation difference value and the first pressure difference value of the raw material 2, wherein the conversion coefficient is the conversion coefficient of pressure and deformation, and the conversion coefficient is equal to the ratio of the first pressure difference value to the deformation difference value; According to the conversion coefficient of the raw material 2 and the processing parameters required for the raw material 2, the initial pressure value of the three punches in the mechanical press for punching the raw material 2 is adjusted, and the adjusted initial pressure value is equal to the product of the conversion coefficient of the raw material 2, the processing parameters and the expression parameters; It can be understood that the processing parameter of the first station is the raw material thickness, the processing parameter of the second station is the stamping depth, and the processing parameter of the third station is the protrusion depth at the bottom of the raw material. The expression parameters include the first expression parameter, the second expression parameter and the third expression parameter.

[0032] In this embodiment, the material of the raw material 2 is low-carbon alloy steel.

[0033] Specifically, during the stamping process of the raw material 2, the material of the raw material may change, and the stamping is greatly affected by the hardness of the raw material. If the hardness of the raw material 2 is not judged, it will have a serious impact on the processing conditions of each processing step, reducing the yield of the workpiece 3 in the parts manufacturing process. The method judges the material changes of the raw material 2 to be processed according to the number of workstations that do not meet the processing conditions, and calculates the conversion coefficient of the raw material 2. According to the processing parameters, the initial pressure values ​​of the three punches in the mechanical press during the stamping process of the raw material 2 are adjusted accordingly, thereby further improving the processing accuracy and processing quality, reducing the scrap rate and rework rate in the processing process, and thus reducing the processing cost.

[0034] In this embodiment, the conveying device conveys the workpiece 3 processed at the third station according to the conveying cycle; After reducing the punching speed of the second punch 12, the actual discharge speed of the workpiece 3 is calculated according to the conveying cycle of the conveying device, and the actual discharge speed is equal to the ratio of the unit time to the conveying cycle. It can be understood that the unit time can be seconds, minutes and hours, as long as it can be used as the unit of the actual discharge speed; If the discharging speed is greater than or equal to the preset discharging speed, it is determined that the discharging speed can meet the production requirements of processing the raw material 2 into the workpiece 3; If the discharge speed is lower than the preset discharge speed, it is judged that the discharge speed cannot meet the production requirement of processing the raw material 2 into the workpiece 3, and the first stamping time of the first punch 11, the second stamping time of the second punch 12, and the third stamping time of the third punch 13 are detected.

[0035] Calculate the first duration difference between the first punching duration and the second punching duration, the second duration difference between the second punching duration and the third punching duration, and the third duration difference between the first punching duration and the third punching duration, and compare any duration difference with the duration evaluation value. If the first duration difference and the third duration difference are greater than the duration evaluation value, and the first punching duration is greater than the second punching duration and the third duration difference, it is determined that the first punching duration of the first punch 11 is too long. The second punch 12 and the third punch 13 have a long waiting time, and the punching speed of the first punch 11 is increased according to the ratio of the first time difference to the time evaluation value; If the difference between the second punching time and the third punching time is greater than the time evaluation value, and the third punching time is greater than the difference between the first time and the second time, it is determined that the third punching time of the third punch 13 is too long. There is a long waiting time between the second punch 12 and the first punch 11, and the punching speed of the third punch 13 is increased according to the ratio of the third time difference to the time evaluation value; Among them, if the actual discharge speed after adjustment is still lower than the preset discharge speed, the punching cycle of the punch head is reduced according to the ratio of the preset discharge speed to the actual discharge speed after adjustment, the cycle of the conveying device is correspondingly reduced, and the pushing frequency of the pushing device is increased.

[0036] If the difference between the first punching time and the second punching time is greater than the time evaluation value, and the second punching time is greater than the difference between the first punching time and the third punching time, it is determined that the second punching time of the second punch 12 is too long. The third punch 13 and the first punch 11 have a long waiting time. According to the ratio of the preset discharge speed to the actual discharge speed, the punching cycle of the punch head is reduced, the cycle period of the conveying device is correspondingly reduced, and the pushing frequency of the pushing device is increased.

[0037] If any time difference is less than or equal to the time evaluation value, it is judged that the stamping time of the punch head is relatively close. The stamping cycle of the punch head is reduced according to the ratio of the preset discharge speed to the actual discharge speed, and the cycle period of the conveying device is correspondingly reduced, and the pushing frequency of the pushing device is increased.

[0038] Specifically, adjusting the process parameters of the device will affect the processing efficiency of the device. If the processing efficiency is not judged, the production schedule will be delayed; the waiting situation of different stamping processes between the workstations is judged according to the difference in stamping time between the punches, and the waiting time between the processes is reduced by increasing the stamping speed, thereby improving the processing efficiency; by reducing the stamping cycle and correspondingly reducing the cycle cycle of the conveying device, the pushing frequency of the pushing device is increased, thereby further improving the processing efficiency; the second workstation is more critical to the processing of raw material 2, and the processing process has a higher priority. By avoiding adjusting the stamping parameters of the second punch 12, the stability of the processing of raw material 2 is increased.

[0039] In this embodiment, the cycle period is the conveying time required for the conveying device to move the raw material 2 forward by one station and return to the initial position before conveying; The punching cycle is the punching time required for the punch head to punch the raw material 2 and return to the initial height before punching; The cyclic steps of the conveying device in one cycle include: the conveying device closes and clamps the raw material 2, the conveying device rises and moves the raw material 2 forward by one station, the conveying device descends, and the conveying device opens and moves back to the initial position; The cycle speed of the conveying device in one cycle includes clamping speed, rising speed, conveying speed, descending speed, loosening speed and rotation speed. The specific method of reducing the cycle period of the conveying device is to increase the rotation speed of the conveying device to reduce the conveying time of the cycle period.

[0040] The punching steps of the punching head in one punching cycle include: the punching head descends to close to the raw material 2 to be processed, punches the raw material 2, and the punching head is lifted to the initial position; The speed of the punch head in a punching cycle includes a falling speed, a punching speed and a lifting speed. The specific method of reducing the punching cycle of the punch head is to speed up the falling speed and the lifting speed of the punch head. It can be understood that the cycle period of the conveying device is equal to the stamping period of the punching head, and the closing time of the conveying device in the cycle step is consistent with the starting time point of the lifting of the punching head in the stamping step.

[0041] 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.

[0042] 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. A method for manufacturing a precision mold for a gearbox part, characterized in that: include: Step S1, automatically loading materials at an initial loading speed, detecting the weight and size of the raw materials, and issuing a warning message if unqualified raw materials are detected; Step S2, feeding qualified raw materials at an initial pushing frequency, and pushing the raw materials to the feed inlet and into the conveying device; Step S3, transporting the raw materials to the first station, the second station and the third station according to the cycle, and performing a stamping process on the raw materials to be processed; Step S4, calculating the pressure borne by the raw material in any station during the stamping process, determining the processing condition of the raw material in any station, and adjusting the processing parameters of the punch head in any station according to the processing condition of any station; Step S5, judging whether the material of the raw material to be processed has changed according to the number of stations that do not meet the processing conditions, calculating the deformation coefficient of the raw material in the first station, and adjusting the initial pressure values ​​of the punch heads corresponding to the three stations accordingly; Step S6, judging whether the efficiency of processing the raw material after adjustment meets the processing requirements according to the adjustment of the processing parameters of the punch head, calculating the difference in the punching time between any processes, and adjusting the punching cycle of the punch head, the cycle of the conveying device, and the pushing frequency of the pushing device accordingly; Step S7, transporting the processed workpiece to the discharge port for discharge.

2. The method for manufacturing a precision mold for a gearbox part according to claim 1, characterized in that: The steps for determining the processing conditions of raw materials in any station include: Detecting the first punch pressure, the second punch pressure and the third punch pressure borne by the punch head and the first bottom column pressure, the second bottom column pressure and the third bottom column pressure borne by the bottom column, Calculate the first, second and third pressure differences between the punch pressure and the bottom column pressure, and compare the pressure difference with the standard pressure difference range. If any pressure difference exceeds the corresponding standard pressure difference range, it is judged that the pressure on the raw material is relatively large, and the processing of the raw material by the punch head in the corresponding workstation does not meet the processing conditions.

3. The method for manufacturing a precision mold for a gearbox part according to claim 2, characterized in that: The step of determining the processing condition of the raw material in any station also includes: If any pressure difference value is the first pressure difference value, it is determined that the thickness of the raw material after being stamped during the stamping process is small; If any pressure difference value is the second pressure difference value, it is determined that the depth of the raw material after being punched during the punching process is large; If any pressure difference value is the third pressure difference value, it is determined that the depth of the cylindrical protrusion generated after the bottom of the raw material is punched during the punching process is relatively large.

4. The method for manufacturing a precision mold for a gearbox part according to claim 3, characterized in that: Adjust the processing parameters of the punch head at any station according to the processing conditions of any station. If any pressure difference is the first pressure difference, the pressure threshold for stopping punching by the first punch is reduced according to the ratio of the standard pressure difference range to the first pressure difference; If any pressure difference is the second pressure difference, reducing the punching speed of the second punch according to the ratio of the standard pressure difference range to the second pressure difference; If any pressure difference is the third pressure difference, the initial height of the third punch is increased according to the ratio of the third pressure difference to the standard pressure difference range.

5. The method for manufacturing a precision mold for a gearbox part according to claim 2, characterized in that: If the first pressure difference, the second pressure difference and the third pressure difference all exceed the corresponding standard pressure difference range, it is determined that the material of the raw material to be processed has changed, and the hardness of the changed raw material is lower than the initial pressure range set by the mechanical press according to the raw material; The deformation difference of the raw material generated at the first station is calculated, and the stroke length of the first punch during the punching process is detected according to the descending length of the first punch, and the deformation difference is equal to the stroke length.

6. The method for manufacturing a precision mold for a gearbox part according to claim 5, characterized in that: Calculating a conversion coefficient of the raw material at the first station according to the deformation difference and the first pressure difference, wherein the conversion coefficient is a conversion coefficient of pressure and deformation, and the conversion coefficient is equal to a ratio of the first pressure difference to the deformation difference; The initial pressure values ​​of the three punches in the mechanical press for punching the raw materials are adjusted according to the conversion coefficient and the processing parameters required for the raw materials. The adjusted initial pressure values ​​are equal to the product of the conversion coefficient of the raw materials, the processing parameters and the expression parameters.

7. The method for manufacturing a precision mold for a gearbox part according to claim 3, characterized in that: After reducing the punching speed of the second punch, the actual discharge speed of the workpiece is calculated according to the conveying cycle of the conveying device. If the discharge speed is less than the preset discharge speed, it is determined that the discharge speed cannot meet the production requirements of processing the raw material into the workpiece. The first punching time, the second punching time and the third punching time of the punching head are detected, and the first time difference, the second time difference and the third time difference between the punching time are calculated.

8. The method for manufacturing a precision mold for a gearbox part according to claim 7, characterized in that: Compare any duration difference with the duration evaluation value. If the first duration difference and the third duration difference are greater than the duration evaluation value, and the first punching duration is greater than the second punching duration and the third duration difference, it is determined that the first punching duration of the first punch is too long; If the difference between the second punching time and the third punching time is greater than the time evaluation value, and the third punching time is greater than the difference between the first time and the second time, it is determined that the third punching time of the third punch is too long; If the difference between the first punching time and the second punching time is greater than the time evaluation value, and the second punching time is greater than the difference between the first time and the third time, it is determined that the second punching time of the second punch is too long.

9. The method for manufacturing a precision mold for a gearbox part according to claim 8, characterized in that: When the first punching time is too long, the second punch and the third punch have a long waiting time, and the punching speed of the first punch is increased according to the ratio of the first time difference to the time evaluation value; When the third punching time is too long, there is a long waiting time between the second punch and the first punch, and the punching speed of the third punch is increased according to the ratio of the third time difference to the time evaluation value; When the second punching time is too long, the third punch and the first punch have a long waiting time. According to the ratio of the preset discharge speed to the actual discharge speed, the punching cycle of the punching head is reduced, the cycle period of the conveying device is correspondingly reduced, and the pushing frequency of the pushing device is increased.

10. The method for manufacturing a precision mold for a gearbox part according to claim 8, characterized in that: Compare the actual discharge speed after adjustment with the preset discharge speed again. If the adjusted actual discharge speed is still lower than the preset discharge speed, the stamping cycle of the punch head is reduced according to the ratio of the preset discharge speed to the adjusted actual discharge speed; If any time difference is less than or equal to the time evaluation value, it is judged that the stamping time of the punch head is relatively close, and the stamping cycle of the punch head is reduced according to the ratio of the preset discharge speed to the actual discharge speed.

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