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CN-121972910-A - Automobile die insert joint processing technology

CN121972910ACN 121972910 ACN121972910 ACN 121972910ACN-121972910-A

Abstract

The invention relates to a combined machining process for inserts of an automobile die, which belongs to the technical field of numerical control machining and comprises three-dimensional data standardization arrangement and layering management, quick selection of geometric elements is realized through spacer layering, process board layout and combined machining unit planning, the process board is standardized and serves as a carrier, a plurality of inserts are optimally arranged, unified machining references are set for the inserts, independent coordinate systems are set for the inserts respectively, and on-site machining realizes that the machining of the inserts is finished through one-time clamping. According to the invention, a one-piece clamping mode is converted into multi-piece combined machining, multiple clamping alignment is reduced to a few times, the whole machining period is compressed by more than 60%, meanwhile, the stability of the precision of the matching surface is improved, the bottleneck of a key path in the machining before assembly is eliminated, a quality foundation is laid for the subsequent assembly and the machining after assembly, and the important nodes for die development are ensured to be achieved on schedule.

Inventors

  • WANG KAIJUN
  • MA SHIBO
  • MU ZHENKAI

Assignees

  • 泊头市兴达汽车模具制造有限公司

Dates

Publication Date
20260505
Application Date
20260312

Claims (9)

  1. 1. The combined processing technology of the automobile die insert is characterized by comprising the following steps of, 1) Three-dimensional data standardization arrangement and layering management, namely establishing a fixed layer classification rule in computer-aided manufacturing software aiming at all 3D insert single piece data needing joint processing, placing geometric elements of odd-numbered inserts in a first group of preset layers, placing similar geometric elements of even-numbered inserts in a second group of preset layers, and realizing quick selection and distinction of geometric elements of different inserts through layer control; 2) Preparing standardized process plates as unified clamping carriers, setting safe distances among inserts, determining the number of the inserts of each combined processing unit according to the sizes of the inserts, and assembling a plurality of inserts and the process plates into the combined processing unit; 3) Setting a unified machining reference, namely setting a unified machining reference for each combined machining unit, setting an independent machining coordinate system for each insert, naming the independent machining coordinate system uniformly, and setting a safety height parameter uniformly; 4) And in-situ machining, namely clamping and aligning the process plate once, automatically finishing machining all inserts by a machine tool, and finally unloading once and transferring to the next working procedure.
  2. 2. The automotive die insert joint machining process of claim 1, wherein the geometric elements include a sheet, a solid, a machining contour, and a dimple center.
  3. 3. The automobile die insert combined machining process of claim 1, wherein the safety distance is equal to or more than 150mm in length direction and equal to or more than 100mm in width direction.
  4. 4. The automobile die insert combined machining process of claim 1, wherein the layout and arrangement rule of the process plate is that 4 inserts are arranged in each combined machining unit when the insert length is less than or equal to 285mm and the width is less than or equal to 130mm, and 3 or 2 inserts are arranged when the insert size exceeds the range.
  5. 5. The automotive die insert joint processing process according to claim 1, characterized in that the safety height is set to a highest safety height value required for all inserts in the joint processing unit.
  6. 6. The combined machining process of the insert for the automobile die according to claim 1, wherein after the unified machining reference is set, complete tool path simulation verification is required, and a combined machining screenshot including a multi-coordinate system indication is uploaded to a manufacturing execution system, and a part number of a first insert of the combined machining unit is associated.
  7. 7. The automobile die insert combined machining process of claim 1, wherein the automobile die insert combined machining process is applied to a machining link before assembly of an automobile panel die for 6-8 months limit manufacturing cycle so as to meet the delivery requirement of a whole automobile project.
  8. 8. The automobile die insert combined machining process according to claim 1, wherein the process board is used as a common installation foundation of all inserts on a machine tool workbench and comprises a base plate, a positioning structure, a clamping mechanism and a physical reference corresponding to a virtual layout rule, wherein the base plate is used for bearing the inserts, the positioning structure is used for fixing the base plate on the machine tool workbench, the clamping mechanism is used for clamping the inserts, and the physical reference is used for setting up a reference of a machining coordinate system.
  9. 9. The process board of claim 8, wherein the substrate is internally provided with a chip removal flow guide cavity, the upper surface is provided with a flow guide groove communicated with the flow guide cavity, and the flatness of the upper surface is less than or equal to 0.02mm; The clamping mechanism comprises a threaded compression hole arranged at each station, the clamping mechanism is in a modularized design and is matched with a standard pressing plate assembly, and the standard pressing plate assembly is used for rapidly replacing equal-height cushion blocks and pressing plates with different specifications according to the sizes of the inserts; the positioning structure comprises a plurality of positioning holes arranged at four corners of the substrate, and the positioning holes are cylindrical pin holes; The physical reference comprises an alignment reference edge and a positioning pin hole of the insert clamping area, The alignment reference edge comprises a Y-direction reference and a lower X-direction reference of the precise grinding edge on the left side of the substrate, and the verticality of the two sides is less than or equal to 0.01mm/500mm; The insert clamping area comprises a plurality of standardized stations which are arranged in a matrix.

Description

Automobile die insert joint processing technology Technical Field The invention belongs to the technical field of numerical control machining, in particular relates to an insert machining process in automobile panel die manufacture, and particularly relates to an efficient and precise machining method for an automobile die insert based on standardized data management and combined clamping. Background The development cycle of the large-scale covering part (such as a car door, a fender and a bonnet) mould of the car is one of key paths for determining the progress of the whole car project. In recent years, in order to respond to market demands rapidly, the whole vehicle development cycle is continuously compressed, and the near-severe requirement is put on the delivery time limit of a die, namely the die manufacturing cycle is generally shortened from the early 24 months to the current 6-8 months. How to simultaneously ensure and improve the final forming quality and stability of the mold during the limit cycle has become a core technical challenge for mold manufacturers. In the conventional automobile panel mold manufacturing process, the process flow is generally strictly divided into two core stages of "pre-assembly processing" and "post-assembly processing". The pre-assembly machining is a necessary link before the die finish machining, the die assembly and the post-assembly machining can be performed only after the pre-assembly machining is completed, the post-assembly machining is a final link of the die machining manufacturing, the completion of the die machining manufacturing stage is marked, and the post-assembly machining is an important node for die development. Thus, the efficiency and quality of the pre-assembly process directly affects the lead time and final quality of the entire mold item. Taking the OP20 procedure of a front door inner plate part of a certain vehicle type as an example, the die of the front door inner plate part needs to carry out numerical control machining on 52 independent inserts one by one before assembly. In the traditional process, each insert is required to independently execute a complete processing flow, namely, installing a workpiece, aligning a reference, establishing a processing coordinate system, performing single processing on a machine tool, detecting quality and disassembling the workpiece. This procedure was repeated 52 times. Only the work piece installation, alignment and removal links, each insert takes on average up to 1.5 hours, resulting in a significant amount of non-cutting time waste. The prior art has the following technical defects: Firstly, the bottleneck of a critical path is prominent, the processing flow is extremely redundant, the efficiency is low, under the limit condition that the die manufacturing period is compressed to 6-8 months, the processing before assembly is used as an insurmountable front link, the efficiency directly determines whether the subsequent processing after assembly and assembly can be started on schedule, and 52 independent clamping and aligning operations form serious process congestion, so that the critical bottleneck for limiting the overall progress of the project is formed. Secondly, the man-machine efficiency is seriously unbalanced, the utilization rate of the numerical control machine tool and the human resources is low, because the insert size is small, the single machining execution time is short, the machining times are numerous and trivial, operators are forced to frequently and high-intensity interfere with the machine tool to carry out repeated clamping, tool setting and machining operation, and the 'one person-machine' mode is essentially that the high-value numerical control equipment and the human resources are limited on a large amount of auxiliary and repeated labor, the automation advantage cannot be exerted, and the equipment utilization rate is low. Thirdly, the accumulated errors are difficult to control, the precision control difficulty is high, the fault tolerance rate is extremely low, in the machining before assembly, the precision requirement of the matching surfaces among the inserts is extremely harsh, the matching clearance is less than 0.03mm, in the 52 independent clamping, aligning and machining processes, the establishing errors of each coordinate system, the tiny abrasion of each cutter or cutter withdrawal can be accumulated and directly transmitted to the final matching precision, and as the machining after assembly is the final link of the die manufacturing, the errors generated by the machining before assembly cannot be compensated through the subsequent working procedures, and huge tests are formed on the technical level and concentration of operators. Fourth, the quality risk is highly concentrated, the quality risk and the cost risk are extremely high, and in a lengthy and highly dependent manual process, any single-link error (such as a coordinate system setting error and c