The reddish molten steel is injected into the sand mold, and the workers' faces are baked red.

A little closer, Lin Hedujue's face was hot.

Traditional sand casting, look outdated, production efficiency is relatively low, and easy to produce sand inclusion, porosity and other defects, the requirements for process control are very high, a link is not strict, castings will become waste.

Lin He watched the workers cast, shake out the sand and take out the castings.

Blank casting, looking like real wool.

The first batch of connecting rods and crankshafts were cast, and the materials used for each part of the engine were different, and the connecting rod and crankshaft could be cast with the same material, so they were cast together, and the rest had to be re-smelted.

The castings were sent for inspection, the pass rate was not bad, the two parts were cast ten pieces each, only three scraps appeared, two crankshafts and a connecting rod, and the others were qualified.

It's all baby bumps, but unfortunately there is no successor.

It's hard, dirty, and tiring, and few young people are willing to learn it nowadays.

The qualified castings were sent to the heat treatment branch for heat treatment, and Lin He followed.

Half of the cost of the trial engine is spent on the transformation of heat treatment equipment, but it is only a small change, and a slightly larger transformation is not tens of thousands of pieces that can be blocked.

Anyone who has read several industrial articles knows how important heat treatment is.

There are many processes in heat treatment, and the treatment process is also different.

The blank casting should be annealed first, and then sent to the grinding workshop of the machining branch for rough processing, and then quenched and tempered, then semi-finished, then semi-finished, then quenched, nitriding, carburizing, etc., and grinding after completion.

Depending on the workpiece, the sequence of heat treatment and machining processes is also different.

It's a bit complicated, time-consuming, and laborious.

Large-scale continuous production is fine, but this small amount of trial production is a waste of cost.

The branch workshop also has opinions, and it can be done at one time, and it has to be tossed back and forth.

It's not that I don't understand the importance of craftsmanship, but I'm afraid of trouble.

Lin He followed the castings around, jumping back and forth in various branches.

After looking at the foundry branch for a while, I ran to the smelting branch non-stop and stared at the second furnace of iron, which is the cast iron liquid for casting the engine block and crankshaft box, and the batching smelting process is different from the previous steel.

Zhou Bingguang had already been tired of finding an excuse to slip away, and after a turn in the afternoon, he flashed again.

If it weren't for Director Zhang's attention, he wouldn't have come in the afternoon.

I was busy until I got off work in the afternoon, and the first batch of castings was not finished.

I went out with Zhu Ping in the evening and earned hundreds of hard-earned money.

The next day was another busy day, and the finished product of the first batch of workpieces was considered to be processed.

Holding a semi-finished crankshaft, Lin He was full of a sense of achievement.

Although he didn't make it himself, he designed it himself and supervised it.

The crankshaft is polished very smooth, like a mirror, like a work of art.

Processing this thing to a special lathe, the factory does not have a lathe for processing crankshafts, this trial product is the metalworking workshop master Sun Yubao hand-polished, the efficiency and the machine can not be compared, but also a few days to polish a similar.

This is a real handicraft work, not something that ordinary people can do.

Lin He will also be there, but his skills are not as good as these masters.

After two days, the crankshaft was polished.

Lin He checked it himself, the accuracy was no problem, and the data was normal.

The taper value is fine, and the radial clearance is within the parameter range.

I checked them all and was completely relieved.

"Master Sun is amazing!"

Lin He gave the old man a thumbs up, and his admiration was from the heart.

The old man was still quite shy: "What is this, I have worn the crankshaft of the car, this can only be regarded as trivial." ”

Lin He praised a few words and coaxed the old man happily.

There are not many people in the factory who have this craft, but there are still three or five.

Zhu Ping is also one of them.

It's all baby bumps, and I don't know how many will be left in another ten years.

After another week, the equipment department and the procurement department have successively purchased complete materials and spare parts, and the spare parts that need to be made have been processed one after another, and a bunch of large and small parts have been classified and placed in the temporary assembly workshop that has been emptied long ago.

More than half of the self-made parts, gear sleeve housings and other things are processed in-house.

Pipe fittings, gaskets, oil pumps, carburetors, etc., which cannot be processed by themselves, are purchased.

Some of the things that can't be bought are also made by small factories.

As long as the core components such as crankshaft connecting rod block piston can be made by themselves, the rest is not a big problem.

On the day of the official assembly, all the factory leaders came to the site to guide the assembly of the engine.

The leaders of the branch and the leaders of the workshop also circled, and they all looked different.

To be honest, at the beginning, no one would think that Lin He, a hairless young man, could really make a motorcycle engine, and he was also skeptical about the design plan and process documents, but no one said it.

Quite a few people waited to see the joke.

But when I watched the parts being processed one by one, my cognition changed unconsciously.

At the moment, all the parts are ready, and most people, except for a few people, are faintly looking forward to it.

After so much effort, no one in the branch workshop who participated in the trial production work wanted to do useless work.

If the trial production is really successful, it will be of great significance to the factory.

Just like Shi Jianfeng, director of the smelting branch at the first discussion meeting, said that if you can build a better engine by yourself, why spend a high price to buy things that others have eliminated, although the factory has many problems, but there are still most people who hope that the factory will be good.

After all, the factory is everyone's job.

Everything is ready.

Lin He assembled it by himself, and two motorcycle enthusiasts gave it a hand.

Fix the box on the shelf that has been done a long time ago, install the connecting rod crankshaft first, then heat the box, and then install the bearing.

The leader didn't say anything, but nodded secretly in his heart.

Industrial production requires such a rigorous attitude.

Single-cylinder air-cooled machine is not so complicated, the organization is simple and simple, and it is difficult to say, workers on the professional assembly line may be able to assemble one in ten minutes, and people who are not familiar with it may not be able to assemble it in a few hours.

Lin He pretended, but it took a long time to get raw.

And I haven't installed this model, so it's slower.

It took an hour to put the improvised 150cc motorcycle engine up.

The factory leaders and the workshop leaders of the branch did not go this time to watch the whole process.

Once assembled, the next step is to start testing.

First check the valve clearance, then the spark plug, the electrode clearance 0.8 is no problem, and then measure the compression ratio of the valve system, and found that the valve camshaft was installed with a wrong tooth, and it took more than half an hour to disassemble and reinstall the correction.

Finally, all the inspections are completed, and the refilling of oil is completed.

"That's it!"

Lin He took off his gloves and wiped his forehead.

It's been a long time since I've worked so hard, and I'm really tired.

The leaders were even more tired than him, and after standing for two hours, their legs were numb.

But no one left.

Hearing that he said yes, they all secretly breathed a sigh of relief.

Many leaders were inexplicably refreshed and had a stronger sense of expectation.

Only a few of them had dark faces.

"Let's try it!"

Zhang Zhenguo was not calm anymore, and hurriedly gave instructions.

Everyone looked at Lin He, the Long March had come, and it was just the last step.

Success or failure, it's up to you.

It became a meeting to celebrate, and it was not ......

Settle accounts after the fall!

Lin He actually didn't know the bottom of his heart, he just built an engine according to the drawings, whether it could be ignited, he didn't know, but his face was very calm, he didn't panic at all, the technical information was complete, even if the process was not so rigorous, there was no big problem.

At most, the performance is poor, and it shouldn't be so bad that it can't catch fire.

After a few thoughts, he stepped on the starting lever.

The force was a little too strong, and I almost hit my foot.

"Sudden ......"

After the sudden sound of the engine running, Lin He secretly breathed a sigh of relief.

It's done!

Finally nothing went wrong.

The onlookers were also in high spirits, listening to the sudden sound that had not been processed by the silencer, and suddenly felt that the sound was so beautiful, and the noise was harsh at all, and the feeling of expectation was too wonderful.

Even if you smell the exhaust fume, you don't feel pungent.

On the contrary, it has a very sweet feeling.

"Great!"

Someone couldn't help but blurt out, and the leaders instantly began to discuss.

"It's really done."

"This kid didn't brag."

"I can't believe we've built a motorcycle engine."

"I can make better ones, and my brain is caught in the door before I pay a high price to buy the broken things that others have eliminated."

Everyone talked about it, but the smile on Deputy Director Chen's face was very reluctant.

At this moment, even people who usually don't care much about the life or death of the factory are all infected.

All cheer up!

This is a stroke that can be recorded in the history of the factory.

How can we not be honored as participants and witnesses?

Even some branch and workshop leaders who were very unhappy with Lin He's tossing back and forth before, the resentment in their hearts was dispersed.

As for the settlement of accounts after the autumn......

The moment the sudden sound sounded, it didn't exist.

"Good boy!"

Director Zhang patted Lin He on the shoulder vigorously, and did not hesitate to praise: "What a talent." ”

Lin He didn't care about being happy, grinning with resentment.

What's more, this is a hammer or a hand, how can an old man who is almost fifty years old still have such a big hand.

The shoulder almost came off the scoop.

And also......

Verbal praise has a bird to use, who is rare this!

Let's get practical!

"Let's go, go back to a meeting!"

The leaders discussed for a while, Zhang Zhenguo greeted him, and the factory leaders went back for a meeting.

The branch leaders continued to stay on site and watch the first motorcycle engine built by the factory.

This is going to be put in the factory museum, how can you not take a good look.

Lin He pulled the accelerator, and the sudden sound instantly became louder.

It's just a feeling of not being very powerful.

The leaders have gone to a decision-making meeting, and a decision should be made soon.

Lin He turned his mind around, pondered for a while, and when he turned around, he saw Su Xiaomei probing his brain behind the crowd.

When she saw him look over, the girl gave him a thumbs up.

Lin He was surprised, and then he was relieved.

This is the site of the machining branch, and it is not unusual for Su Xiaomei to come over to see the excitement.