Combined with the practical application characteristics of automobile panel molds, research and analysis are carried out, and a guide post that can realize automatic adjustment is designed.The mold guide structure and development scheme of the guide bush clearance eliminates the stubborn quality problem of single deviation of the guide post caused by factors such as machining accuracy, assembly accuracy, and machine tool error, and improves the quality of the mold and customer satisfaction. Verified by actual production, the structure and development scheme are simple, effective, and easy to operate, and have a certain reference for the development of similar molds for automobile panels.
Introduction
With the continuous development of the automobile industry, the automobile industry will launch many models every year, and each model will develop corresponding tooling molds. The structure of the outer guide column used in the development of our company’s previous projects is the conventional implanted guide column guide sleeve guide structure. , when the mold of this structure is accepted by the customer,60%The above guide post and guide sleeve components will have a single deviation in the coloring and coloring.
This problem is very difficult to eliminate. When the customer accepts the problem, the problem cannot be sold out. If it does not meet the customer’s requirements, the product part and mold customer acceptance will not pass; The single offset of the coloring in the research and development of the sleeve will seriously reduce the service life of the standard parts of the guide post and guide sleeve, and increase the maintenance cost of the mold; at the same time, the occurrence of this problem will cause the center of the upper and lower molds of the mold to deviate and increase the mold research and development cycle.
How to avoid the above problems during the development of the mold is the focus of the mold tooling development. Through the research and analysis of the structural characteristics of the automobile panel mold, an adjustable gap guide post is adopted./The guide sleeve structure can eliminate this quality problem to improve production efficiency and guide post/The service life of the standard parts of the guide sleeve and the reduction of the development cost of the mold can effectively solve the above problems.
Data Collection And Analysis
The single deviation of the guide column of the mold that has been shipped from the factory
According to the customer acceptance problem points of the out-of-the-box molds, the problem points of customer acceptance are summarized, and the single deviation of the molds is counted. Details are as follows:
The statistical results are as follows:43The number of auxiliary mold guide posts is172group, the number of single-biased molds for the guide post is26Vice, the number of guide posts is104group, the number of qualified molds is:17Vice, the number of guide posts is68group, the pass rate is40%.
Data collection – current production mold guide post single deviation
Collect and analyze the coloring of the guide pillars according to the current production and assembly and debugging stage of the mold, and count the single deviation of the mold. Details are as follows:
The statistics are as follows: the number of mold verifications in process is10The number of auxiliary mold guide posts is40 group; the pass rate is50%.
According to the above statistics of the coloring of the guide post, the coloring of the guide post is serious and needs to be solved systematically.
The statistics are as follows: the number of mold verifications in process is10The number of auxiliary mold guide posts is40group; the pass rate is50%.
According to the above statistics of the coloring of the guide post, the coloring of the guide post is serious and needs to be solved systematically.
Cause Analysis
For the problem of single deviation of the guide column, the project team analyzes the cause of the problem and refers to the successful experience and work ideas of other companies.&Conduct investigation and analysis in various aspects such as testing to find the real cause of the problem. Through discussion and analysis, the primary and secondary causes were identified, as shown in the following table:
Through analysis, we finally get8potential factors, as follows:
Troubleshooting
After analyzing and determining the primary and secondary factors of the single deviation of the guide column, the project team held a group meeting to divide the work, formulate relevant work plans, and verify and confirm the potential factors that may cause the single deviation of the guide column. The details are as above.Through the application of “man, machine, material, method, environment, and test” quality tools, analyze, check and verify the causes of problems, formulate verification work plans according to the listed possible causes, and verify one by one , The true cause of the final determination is as follows:
The precision of the stamping machine, the rationality of the structure of the guide part and the machining accuracy are the three factors that affect the coloring of the guide post of the die.
Countermeasures
The project team visited the well-known automobile outer panel mold factories in the industry. Through the visits and exchanges, it was found that most of the mold guide structures of these mainstream mold factories adopt the European standard guide structure, which has the function of automatically adjusting the relative guide gap.
The project team discussed the main reasons and the results of the visit, and decided to adjust the structure to eliminate the influence of the three factors of the precision of the stamping machine, the rationality of the structure and the machining accuracy on the coloring of the die guide column.
The specific improvement plan is as follows:
- Institutional design.Determine the guide column according to the design standard according to the length and width of the mold/Outer diameter of guide bush ΦD/ΦD1and lengthL;According to the length and width of the mold, determine the guide column according to the design standard/The spacing and position of the guide bushes; select the European standard flanged guide bushes (CMG61) and guide bush anti-dislodgement (CMG72/73); select the guide post corresponding to the guide bush (CMG51); set the installation surface of the guide post, the guide sleeve and the guide post anti-drop structure; determine the number and installation position of the guide post anti-drop structure; set the guide sleeve protection table; after the drawing is completed, issue3DStructural drawings (the specific structure is shown in the figure1shown).
- processing technology design.According to guide/For the specification of the guide bush, determine the guide post in accordance with the “Guide Post and Guide Bush Tolerance Fitting Requirements”/Machining tolerance of guide bush mounting hole: ΦD H7/r6ΦD1E7/g6; Issue the processing technology;
- processing and assembly.according to3DStructural entity and processing technology, processing guide column/Guide sleeve installation hole; check the size of the guide post and guide sleeve installation hole, if the installation hole size does not meet the process requirements, go back to the previous step; if it meets the process requirements, go to the next step; follow the3DStructural entity installation guide post, guide sleeve, guide sleeve anti-off block;
- production debugging.Install the mold in the debugging/On the production machine; clean the inside of the guide sleeve and the outer plate of the guide column; use a wrench to loosen the guide sleeve anti-fall off block; turn the guide sleeve counterclockwise and clockwise for one week; operate the machine tool to close the mold3~5The second time, the guide post and guide sleeve are automatically guided to achieve a uniform gap between the two; lock the guide sleeve to prevent dislodging; the guide post is brushed with a blue sheet; Return to the step of turning the guide sleeve counterclockwise and clockwise for one turn, and re-adjust and test according to the process; if the coloring is qualified, proceed to the next step for production debugging.The specific process is shown in the figure2shown.
- The method of the invention is simple, clear in structure, convenient in operation, cleverly uses the mold structure and tolerance matching, and under the premise of satisfying the blanking gap and guiding precision, the guide post is/The matching of the guide sleeve can realize the automatic alignment function, so that the guide post/The gap of the guide sleeve is uniform, which solves the problem of the guide post/The stubborn problem of single deviation of the guide sleeve improves the service life of the guide post and the guide sleeve and customer satisfaction, shortens the design and debugging cycle of the mold, and reduces the manufacturing cost of the mold.
Assembly Verification
Newly developed in the companyS7The project mold adopts a new European standard guide structure, and the production and manufacturing enter the assembly stage./The blue dan coloring situation was verified and confirmed.The guide pillars verified this time are:32Group,28combined grid,4Group failure (does not affect the normal use of the mold), red (blue) Dan coloring pass rate90.6%.
Concluding Remarks
Combined with the practical application characteristics of automobile panel molds, research and analysis are carried out, and a guide post that can realize automatic adjustment is designed./The mold guide structure and development scheme of the guide bush clearance eliminates the stubborn quality problem of single deviation of the guide post caused by factors such as machining accuracy, assembly accuracy, and machine tool error, and improves the quality of the mold and customer satisfaction. Verified by actual production, the structure and development scheme are simple, effective, and easy to operate, and have a certain reference for the development of similar molds for automobile panels.
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