Jiang Feng studied the drawings and thought that the biggest difficulty in refining the explosive bomb was the trigger mechanism, and the power of the explosive bomb mainly came from his instantaneous expansion power, and only when the expansion was completed in an instant could the explosive bomb exert its maximum energy.

Another difficulty lies in the needles.

When an explosive bomb is closed, the steel needles inside are all folded together, and only by triggering the mechanism and popping open the outer layer of the explosive bomb can the steel needles inside pop out.

One more thing, explosive bombs are not disposable consumables, they can be used over and over again. Therefore, it is also a science to put those steel needles together, and it is impossible to close them one by one, which is too time-consuming and energy-consuming.

These are all technical problems.

However, through the drawings, Jiang Feng drew inferences from one another, and wanted to design a catapult device, using the principle of the ballista gun to launch a larger explosive bomb, and between the ballista gun and the explosive bomb, a thin steel wire with full toughness was connected, which could be retracted into the crossbow gun after the explosive bomb exerted its power and used repeatedly.

Of course, this device was only Jiang Feng's initial idea, and the first thing he had to overcome was how to refine the explosive bomb.

Jiang Feng put all the materials needed to refine the explosive bombs by his side one by one, sacrificed the Shouyang Wanhua Furnace, raised his hand and pointed at it, and the beast fire entered the fire channel of the Shouyang Wanhua Furnace to preheat.

I grabbed a material and threw it into the furnace, only to realize that this material was one of the most important materials for refining the steel needle in the explosive bomb, and because of its importance, it was difficult for a material to make the desired effect.

Several materials must be fused together to make a composite material that increases toughness, elasticity and rigidity.

However, this material was more difficult to refine than Jiang Feng had imagined, and it took a few minutes for this material called graphite carbon to refine the skin, and there was still some distance before it was fully refined.

Jiang Feng finally ran into big trouble, because refining ordinary materials before, it was effortless at all, but when he really encountered special materials, his Shouyang Wanhua Furnace saw the drawbacks.

From the analysis of the process of refining graphite carbon, Shouyang Wanhua furnace has certain limitations, or it is just a low-grade refining furnace.

However, since he took over the task of exploding bombs, Jiang Feng could only continue with his head.

After a quarter of an hour, most of the graphite carbon has been refined, and the surface layer has basically softened into a liquid form, except for the part that has not yet completely melted due to the lack of temperature.

Jiang Feng was a little anxious, and then increased the input of the beast fire, and strong flames passed through the Shouyang Wanhua Furnace Fire Channel.

"Woo woo woo ......"

It was very strange that the Shouyang Wanhua Furnace actually made a piercing sound under the scorching flames.

At the same time, the scorching temperature accelerates the melting time of the graphitic carbon, and the graphitic carbon is about to be successfully refined.

Jiang Feng grabbed another piece of material and threw it into the furnace, which is one of the materials that blends with graphite carbon.

However, just as the material specifications fell into the furnace, Jiang Feng suddenly had a very bad feeling in his heart.

It's broken, something is going to happen!

Subconsciously, he quickly pulled away from the beast fire of the Shouyang Wanhua Furnace.

However, even if he realized the danger, he was still a step too late, and the outer skin of the Shouyang Wanhua furnace was cracked, and the cracks were shocking.

Fortunately, due to the timely resolution, the danger of the fryer was finally avoided, but it was inevitable that the Shouyang Wanhua furnace was reimbursed.

The refining stopped, and without the refining furnace, even if Jiang Feng had a great self, it would be impossible to do it.

When the temperature of the Shouyang Wanhua furnace completely dropped and the materials inside were put away, Jiang Feng regretfully put away the Shouyang Wanhua furnace. Although the Shouyang Wanhua furnace could not be used, it had accompanied Jiang Feng for a long time, and Jiang Feng was reluctant to throw it away.

If there is a chance to remedy, Jiang Feng is still ready to repair the Shouyang Wanhua furnace.

......

The next day, handing in the tasks he took over yesterday and receiving points and rewards, Jiang Feng chatted with Old Man Wu alone in the reception room.

Old man Wu likes to chat with Jiang Feng now, because in his opinion, Jiang Feng is a rising supernova, and in the future, if it goes well, he will definitely be able to make great achievements in alchemy.

And as Jiang Feng's master, although he is only a vacant position, he is proud of it, and the vacant position will be able to stain Jiang Feng with some light in the future and increase his popularity and reputation.

After chatting for a while, Jiang Feng turned the topic to the refining furnace.

"Teacher, do you have a better refining furnace under your hand, my refining furnace was accidentally broken yesterday. Jiang Feng said.

"Refining furnace?" Old man Wu shook his head and said, "It's easy to say anything else, there really isn't a refining furnace, my old man hasn't done it for decades, and the two good refining furnaces have already been given away!"

"Then can you find me one, or spend money on a ......?"

Old Man Wu glanced at Jiang Feng, squinted his eyes and said, "With the frequency with which you take over the task and the success rate of refining, I estimate that the refining furnace you use is very good, at least it should be at the prefecture-level level, it is not easy to find a refining furnace of this level!"

Jiang Feng was slightly disappointed, Old Man Wu was still very capable, if even he couldn't find a temporary replacement refining furnace for himself, then he really didn't know what to do in the future.

Old man Wu smiled and said, "I can't find a good refining furnace, but I don't mean that there is no suggestion, you do what I say, and I guarantee that you can get the refining furnace you want!"

"Yes, teacher, please speak!" Jiang Feng was happy in his heart, sure enough, Old Man Wu had a lot of ideas and ideas.

Old man Wu looked at Jiang Feng's anxious look, but he stroked his goatee unhurriedly, and said slowly: "In the area of Yangping City, there are two best places for refining weapons, one is in Shouyang Mountain outside Yangping City, which can be said to be the holy land of the Refining Sect, and its reputation is outside, at least one of the best in Yangping County......

"The second one, far away in the sky and close in front of you, is our Haoyang Refining Academy. Although our Haoyang Refining Academy is not as good as the Shouyang Mountain Ten Thousand Weapons Sect, in Yangping City, it is second to none, and it is a little stronger than other refining colleges......

Jiang Feng frowned, and said in his heart how did Old Man Wu start popularizing the knowledge of the Refining Sect to him today.

Old Man Wu didn't look at Jiang Feng's expression, and continued: "Over there in the Ten Thousand Weapons Sect of Shouyang Mountain, if you want to get a relatively good refining furnace, it is simply a fantasy. The people over there regard the refining furnace as their life, and there are not a few refining furnaces that have reached the ground level, but it is absolutely impossible to give it to others casually. ”

"Can't you buy it?" Jiang Feng asked.

"Don't think about it, you can't buy it with any amount of money!" Old man Wu immediately denied Jiang Feng's idea, "Shouyang Mountain doesn't need to think about it at all, and really put your mind to it in our refining academy!"