Just stepped into the eaves of the workshop in early summer.
The first thing I touched was the cool residual heat from milling on the metal table.
When you and I first came into contact with the CNC milling workshop.
The first thing I want to know is what it is.
What types of high-precision parts processing can be done here.
No need to get dizzy staring at the sky full of parameters.
Find a set of content that has basic introductory to practical guides and smooth out the logic first.
I have seen novices who have just entered the industry come to the door in a panic with parts drawings as big as their palms.
The tolerance accuracy is even more outrageous than one ten thousandth of a hair.
The master smiled and shook his head, pointing to the section of the aluminum part he had just finished milling.
The accuracy is too outrageous and it will take ten and a half days to polish, which is a waste of money.
Either it cannot be realized at all, and it would be a bad thing to meet the deadline with wrong results.
You might have discovered it early.
Many new entrepreneurs have just connected with the workshop for parts technology.
The reference dimensions for installation and positioning are often missed.
The subsequent milled parts are sent to the assembly process.
You can count on your fingers a dozen or so slip-ups.
A common experience in the workshop is to try cutting the first piece with a 3D drawing.
Confirm that the number of cards of all sizes is in compliance.
Then let go of full production and reduce the risk of failure by ten times.
When the chirping of cicadas in early summer floats out along with the soft sound of spinning tools in the workshop.
I was standing at the corner where aluminum financial bins were stacked.
I have actually seen newcomers rush into the workshop holding a full text version of fuzzy hand-drawn papyrus.
I talked to the engineers for three hours about the sci-fi precision requirements that I had imagined.
In the end, I found out that the other party couldn't even find the origin of the coordinates of the processing datum.
The waste that took half a month to debug fell into a pile, completely burning up the budget.
Later, this young man who had been crawling for three months finally came up with the truth after painstakingly grasping it.
First, read through half of the most basic workshop processing knowledge before doing the work.
At least it can save the ineffective cost of 60 to 70 clumps of chaos.
I might as well ask you a question at this point.
When starting the docking workshop for the first time, which details should be given priority to keep.
It's never about comparing the total price quoted by someone else with the price falling further to the bottom.
Instead, first check whether the other party can reliably keep the repeat tolerances of key dimensions for you.
There are countless real cases that I have seen in my many years of practice.
The customer coveted the odd price difference of RMB 80 and handed the order to the small workshop.
A batch of thousands of magnesium alloy parts was brought back.
When checking the card sizes one by one, 30% of the pieces fall outside the allowable range.
Once installed on the downstream assembly line, it immediately jammed.
Going back and forth, coordinating the time for rework and scrapping of small parts, it was enough to make a formal production order divided into two batches, and there was still room for half the journey.
You will slowly be able to understand the core doorways.
Qualified CNC milling workshop.
The first step is to prepare for your start-up briefing and sort out the fastening and clamping plan of the parts.
Even small precision components that are small enough to fit in the palm of your hand.
You can never just put a rubber block on it and twist it, and then directly use the tool to perform milling.
Improper use of clamping auxiliary tooling.
The off-centre size is offset by about ten wires inward.
The pass rate of the entire batch of parts should drop by at least 30 to 40 percent.
Continue to follow the traces of the road you walked before and go deeper.
We must maintain the stability and reliability of parts delivery.
You also need to work with the workshop to set hard standards for the daily rotation and verification frequency of tool consumables.
I tried staring at the old technician holding a micrometer and repeatedly controlling the gap between cutting chatter lines.
The scales on the worn-out calipers, which have been jammed with nearly 10,000 large and small parts, are clearly visible.
Generally, tungsten steel end mills are commonly used, which can reciprocate at high speed to complete the milling distance of 600 to 700 meters.
The sharpness of the cutting edge must have dropped by more than one step.
At this time, if you try to save trouble by not replacing it in time.
The part's sidewall roughness will definitely climb to two or three times the mark line.
The finished processed surface feels rough and has burrs. Once it is handed over to the final customer, it will inevitably cause complaints and negotiations.
These are all the rules that have been learned from the daily practice of pyrotechnics.
I haven't heard half of the theoretical textbooks explain it in a straightforward manner.
But you spend a whole week in a serious and reliable processing workshop to see the complete process.
These pitfall guides don’t require anyone else to waste a single word of instruction.
You yourself looked at the small half wall of the workshop filled with neatly stacked quality products.
Following that train of thought, I further sorted it out, and with a half-push and half-pull, I found all the key points very clearly and thoroughly. The wind in early summer carried the faint metallic smell emitted by the machine tool.
Slowly brush the edge of the workstation and spread out the corners of the craft paper covered with dark blue plaid.
You still want to ask one more layer of questions.
When the delivery pace is like winding up clockwork.
How to maintain the accuracy and speed of both ends and not fall below the line?
The reliable approach is never to blindly increase the speed of the machine tool to the skyline in an instant.
Instead, we first follow the long-term practical experience of senior technicians.
Measure the depth range of the knife in layers and mark it clearly and neatly.
Ordinary 6061 aluminum alloy parts can be made to exceed the standard quantity.
The machine tool was vibrating violently. Such tremors could cause the marker pen placed on the table next to the workstation to be vibrated up, and the marker would bounce up and then roll to the ground.
The surface of the workpiece forcibly produced in this way is covered with chaotic chattering lines.
You'll have to spend twice as much polishing time later to repair it slowly.
The total production cycle time will definitely not decrease, but will increase exponentially.
If you stick to the regular layered processing rhythm and move forward steadily.
The one-time production pass rate for the entire batch of orders is firmly above 98%.
In the subsequent steps, the time that was wasted here and there can naturally be reduced to a considerable part in batches. Ability to smoothly deliver orders to customers within the pre-estimated contract period.
According to this logic, take root at a deeper level, think about it, and then deduce it. These are the issues that everyone is concerned about very frequently in their daily lives. I will explain it to you thoroughly, clearly and clearly through Q/A.
Q: Can this specific link of first article inspection be omitted? Answer: That absolutely cannot be omitted. The first piece must be fully parameterized before it can be pushed into the mass production stage. Moreover, if rework is performed afterwards, the time spent will be more than five times longer than normal.
The question is, is it feasible to use cheaper substitute materials? The answer is that low-standard substitute materials are easily prone to chipping and deformation due to deviations in hardness. If the cost exceeds the cost of subsequent comprehensive correction, the final result will be greater than the gain.
Question: Can we start construction without formal three-dimensional graphics and only with hand-drawn papyrus? Answer: All benchmarks must be checked first and the design details of the specifications must be supplemented before production is started to avoid the extremely high risk of batch scrapping.
Q: How do we need to arrange advance plans when delivery exceeds the cycle? A: Fifteen percent of the buffer processing materials can be reserved for scheduling burst patterns and debugging to ensure that the central node process will not be severely disrupted.
Q: If the surface roughness requirements are too high, are there any pitfalls of additional price increases? A: If redundancy occurs in ordinary precision annotation, the labor cost will be in vain. Determine the standard based on demand, so that the budget will be clearer, more controllable, and more reasonable.
These are the real conclusions grounded in actual combat.
They are all valuable and practical advice and experience gained after seeing hundreds of pitfall cases.
Now when we look back, let's re-read the core knowledge and keep it in our hearts.
The real core is the cooperative value of the CNC milling workshop, and this value is not at all reflected in the low number reported.
Rather, he can steadily accompany you throughout the entire process, from design to drawing, small slopes, and pits, to trial work and troubleshooting.
No matter how small the newly entered prototype is.
Still, hundreds or even thousands of batch orders are often rolled out to carry out long-term operations in large processes.
As long as you discuss the benchmark requirements clearly and thoroughly in the first step of communication from the very beginning, there will be no ambiguity or laxity at all.
Walking back to the entire subsequent processing link, every step is like the surface of a lake in early summer. When the wind does not blow by, there will be no annoying wrinkles at all, and it will naturally appear extremely smooth. I will give you the most practical suggestion for practical action, which is to do the first small thing right away. Carefully lay out the machining parts drawings you are holding in your hands and place them on the surface of the desk.
Holding a red pen, carefully compare the marking column, check the datum tolerance three times one by one, and then check the surface marking information.
If you find any vague, ambiguous or specious description position, you should immediately start writing to supplement and improve it to make it regular and neat.
It took less than twenty minutes and half a day to complete this little action.
But such a trivial and brief action.
It can lead to hundreds and thousands of parts on the entire long production route.
Secretly help you block the large amount of fruitless time and money wasted in the pit early, quietly and steadily outside the door. On this early summer evening that is about to come to an end, the last rays of the setting sun are streaming down to the ground along the bright, half-open glass of the tall, ventilated factory building.
Falling on the shiny guide rail surface, it reflects thin, shining, and fine golden light. Counting all the principles one by one from the beginning, the core is just the common sense that has been said so much that it has not become outdated for a long time.
Do more practical work in advance. You will encounter ten to eight times less meaningless twists and turns and interference on the subsequent journey.
Do you still have to wait for some extra complicated excuse at this moment? Do you have to wait until you are covered in cold sweat, have a big fall, and are in pain to the bones before you gain this kind of valuable insights and experience?
