At half past one in the afternoon, when China Machinery Company officially went to work, Su Qicai called Li Xiang, who was reading at his desk, and said, "Li Xiang, don't read the book yet, I'll take you to the scene to see." Pen "Fun" Pavilion www.biquge.info"

"The equipment in our machine processing workshop was relocated from Germany when the factory was built, although it is a little old, but the processing accuracy is still very high." Su Qicai said.

At this time, they had already come to the machine body processing workshop, Li Xiang looked up, and sure enough, the equipment looked quite old, and the green paint on the surface had almost fallen off.

Su Qicai took Li Xiang to the first equipment and said: "This is the first process of machine body processing, rough milling machine body positioning side and top surface. ”

Li Xiang looked up and saw that the structure of the machine tool was a horizontal machine tool, and the two milling cutters in front and one behind were processed at the same time to process the side and top surface of the diesel engine body.

"The processing of the positioning side is out of process demand and plays a role in positioning for post-processing, so its size requirements are relatively high." Su Qicai patiently explained to Li Xiang.

Li Xiang listened very carefully, after all, this knowledge cannot be learned in any book, and these are the basis for his future work, and he must be firmly mastered!

"After the first process is processed, after the flip mechanism, on the next machine tool, rough mill the bottom surface of the machine body, and then the positioning side of the first process plays the role of positioning." Su Qicai continued.

Li Xiang looked at the second machine tool, the structure of this machine tool is basically the same as the first one, except that there is an additional flip mechanism between the two machine tools, which mills the top and bottom surfaces of the machine body respectively.

The third machine is noticeably different, with two long drill bits instead of a milling cutter.

"Su Gong, this machine should be drilled." Li Xiang asked.

Su Qicai nodded and said: "Yes, this process is to drill the bottom surface of the positioning pin hole, which is a very important process, and the two positioning pins it drills out will basically be used in the next process." What we usually call two pins on one side refers to these two positioning pin holes. ”

Li Xiang nodded, and remembered everything Su Qicai said in his head.

Su Qicai took Li Xiang to look at the next processes one by one, focusing on explaining the clamping, positioning methods, and structural characteristics of each process.

"After the completion of this process of processing the top face system, the following processes are finished, and the requirements for dimensional accuracy and shape and position tolerances are more stringent." Su Qicai said, "And the body processing line is also divided into two production teams from here, the front is the first shift of the body, and the back until the warehousing process, all belong to the second shift of the body." ”

"Come on, let's take a look at the first process of finishing, broaching the tile. The requirements for the width of the tile mouth are very high, because it should be combined with the bearing cover to form the main bearing hole of the engine to install the crankshaft, so it can directly affect the accuracy of the crank connecting rod mechanism of the engine. ”

Li Xiang nodded and said: "I know broaching, it mainly uses multi-tooth broaches to cut a very thin metal layer from the workpiece in turn, so that the surface can achieve higher precision and smaller roughness values. ”

Su Qicai laughed and said: "Yes, and there is another advantage of broaching, that is, the production efficiency is relatively high." ”

When Li Xiang heard Su Qicai say this, he couldn't help but have some questions, because in Li Xiang's opinion, the cutting speed of this broach is not high, and it is much slower than the milling cutter disc he just saw, why did Su Qicai still say that its production efficiency is high?

As if seeing Li Xiang's doubts, Su Qicai smiled slightly and said: "Don't look at its cutting speed is not high, but because the broach is a multi-tooth tool, there are many teeth participating in the processing work at the same time, and the cutting edge participating in the cutting is longer, and the rough-semi-fine-finishing can be completed in a working stroke of the broach, so the basic process time and auxiliary time are greatly shortened." ”

Su Qicai continued to take Li Xiang to the next process, pointed to a working operator and said: "This process is to close the bearing cover, this bearing cover is also made of broaching, and it is tightened according to the requirements of a certain resultant moment." ”

Li Xiang saw that after the operator finished closing, he took a small hammer and knocked a mark on the top of each bearing cover, and couldn't help asking: "Su Gong, what's the use of marking the bearing cover?" ”

Su Qicai smiled and said, "You observed very carefully." This marking is very necessary, because there is also a process of fine boring of the spindle hole in the later process, and after the fine boring, the bearing cover must not be interchanged. When assembling the crankshaft, the bearing cover needs to be removed, so it must be marked in advance to prevent mixing and misplacement. ”

Next, I looked at the finishing milling bottom surface process, the machine tool used in this process is actually exactly the same as the machine tool used in the front rough milling bottom surface, but the processing parameters are slightly different, the cutting allowance is relatively low when the bottom surface is finished, and the cutting accuracy requirement is relatively high.

And then there is the fine boring spindle hole mentioned by Su Qicai just now, and the fine boring camshaft hole and idler shaft hole are also done in this process, so this process is also called fine boring three-axis hole.

Then there is the last process of machining, which is the fine boring cylinder bore.

"That's the last step in the process." Su Qicai pointed to the machine tool and said, "This process is the quality control point of the entire production line, which is very important, which you will slowly understand in your future work." ”

"So what's going on here?" Li Xiang asked, pointing to an operator next to him.

Su Qicai glanced at it and said, "This is the last process of the entire body line, the warehousing process." This process includes deburring, grinding, etc., which is the dirtiest and most tiring process. ”

At this point, the entire body processing line is considered to have been introduced to Li Xiang, Li Xiang stood next to the last process, and before transporting it, he had a full view of the structure of the entire workshop.

At this moment, a young man in blue overalls walked to the side of the operator of the fine boring cylinder hole process and shouted: "Gao Guoqing, the size of the body you sent for inspection is out of tolerance, and I am going to stop production now, and all the products you did before were rated as substandard products." ”

Gao Guoqing was shocked, this young man was Chen Menglun, the inspector of the body line, who had just gotten the test results from the three-coordinate laboratory.

Gao Guoqing did not refute, but asked Su Qicai on the side for help: "Su Gong, look, can you blame me?" If it's all substandard, I'll do it for nothing today. ”

Su Qicai sighed and said: "There is no good way now, wait for a while to organize a review of personnel, and try to recover the loss." ”

Gao Guoqing listened, his face was disappointed, and he took the inspection report thrown by the inspector Chen Menglun and went to the maintenance personnel to adjust the equipment.

Li Xiang stepped forward and asked, "Su Gong, what's going on for a while?" ”

Su Qicai sighed and said: "Alas, the first piece processed by the body every day needs to be sent to the three-coordinate laboratory for inspection, but the inspection time is too long, so before the results are released, the production has been continued on the line, and after the results come out, many processes often have unqualified sizes, so that the previously processed body is counted as unqualified products and needs to be reviewed." ”

Li Xiang nodded and continued to ask, "Then why doesn't the operator measure it himself?" If you don't qualify, you can find out in advance. ”

Su Qicai shook his head, pointed to the body on the side and said, "Look at the structure of this body, there is no way to measure many dimensions directly online. ”

"What about indirect measurements? Designing and making some simple measurement fixtures? Li Xiang continued.

Su Qicai's eyes lit up and said, "Oh, why didn't we think of it, it seems that it is a blind eye, and we can't see Mount Tai." Li Xiang: The task of designing and producing online measurement tooling is handed over to you, can you complete it? ”

Li Xiang smiled, patted his chest, and said confidently: "Su Gong, don't worry, I promise to complete the task." ”