Sheet Metal Fabrication Service Processing steps For Sheet Metal Parts - Custom Sheet Metal Fabrication Service Company
10. Assembly. The so-called assembly is to group multiple parts or components together in a certain way to make them into a complete material. One thing that needs to be paid attention to is the protection of the materials, and no scratches. Assembly is the last step in the completion of a material. If the material cannot be used due to scratches, it needs to be reworked and reworked, which will waste a lot of processing man-hours and increase The cost of the item. So pay special attention to the protection of the item.
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"Discontinued production is a last resort, and this matter will indeed have a great impact on our performance this month, or that of the fourth quarter." After the impact of suspension of production, chloro-alkali chemical (600618.SH)'s director secret Xu Peiwen's voice Slightly heavy.
Xu Peiwen said, "The reasons for the suspension of work are many: On the one hand, there is insufficient supply of ethylene for the upstream raw materials; on the other hand, due to the impact of the international financial crisis, the installations of the downstream companies of the entire chemical park have been suspended."
Reproduction by the end of December
Tianyuan Huasheng not only stopped the production of dichloroethane (EDC), but also reduced production of caustic soda and PVC plants. "Our devices are all connected together, so when dichloroethane is discontinued, the production of our other products will certainly be affected," Xu Peiwen said frankly.
The data shows that chlor-alkali chemical's main business is PVC, caustic soda and chlorine products. Among them, PVC accounts for more than 40% of operating revenue, and chlorine products represented by dichloroethane are the second largest source of profits for the company.
In the first three quarters of the company's operating income was 2.84 billion yuan, of which PVC's revenue was 1.311 billion yuan, accounting for 44.79 of total revenue, but the gross profit margin of such products was -8.84%. In contrast, the profit contribution of caustic soda reached 79%.
"The reason why the gross profit of PVC is so low is because the production of PVC for the company uses the ethylene process." An industry official in the chemical industry said: "This is a product derived from petroleum, so it is sensitive to fluctuations in oil prices." ."
The rapid rise in international oil prices in the first half of this year led to a substantial increase in production costs. However, compared with domestic companies that use calcium carbide to produce PVC, the production cost of chlor-alkali chemicals is still too high and it is at a disadvantage in the competition.
Since the second half of the year, with the sharp drop in oil prices, the company's production costs have also entered a decline, and the market competitiveness of products has also been enhanced.
A chlor-alkali chemical worker said: “Since this time, the sales of our company's PVC have been much better than before, and there is no inventory.†In fact, as of December 9, the price of the company's PVC has been 5500 from the previous period. RMB/ton increased to RMB 6,400/ton, and the PVC business is in the best operating condition in the year.
No, sudden stoppages affected the production of PVC.
The industry is stranded
The suspension of production of some of the chlor-alkali chemical plants has reflected the difficulties of the entire chlor-alkali industry. “Now, many chemical-industry-owned plants in the chemical park have all stopped working,†said a staff member of the chlor-alkali chemical securities office.
Under the background of a sharp drop in the industrial boom, the lack of downstream demand is an important factor affecting the PVC market. On December 16, in the Guangdong Plastics Exchange, due to the rise in the price of calcium carbide, some PVC manufacturers raised the ex-factory price of PVC, but due to insufficient demand, the market had only a small amount of transactions.
In addition to PVC, the demand for caustic soda has also unavoidably weakened. "The domestic caustic soda market is under pressure. This is a chain reaction," said industry analysts. Data from the Chemical Consultation Network shows that in mid-December, the price of caustic soda continued to be light.
Under such an industry situation, it is not surprising that chemical companies have reduced their load and stopped production. Taking Hangzhou Power Group as an example, due to the increase of electricity and coke prices, the company’s cost pressure was too high, and 80,000 tons of PVC production facilities were forced to stop production. The PVC production line with an annual production capacity of 120,000 tons at the giant plastic company in Zhejiang is also in a standstill.
According to the third quarter report released by seven listed companies in the chlor-alkali chemical industry, the profitability of most chlor-alkali enterprises fell from January to September. For instance, the total profit of Zhejiang Juhua Co., Ltd. (600160 Quotes, Love Shares, main trend) has dropped by 96.31%; the total profit of Nanning Chemical Industry Co., Ltd. has dropped by 291.80%.
Analysts said that at present, during the difficult period of the industry, new challenges have been raised for the chlor-alkali industry, and high costs and other pressures will prompt the chemical industry to accelerate the pace of integration.
1. Design and draw the part drawing of its sheet metal parts, also known as three views. Its function is to express the structure of its sheet metal parts by means of drawings.
2. Draw an unfolded drawing. That is, unfold a part with a complicated structure into a flat piece.
3. Unloading. There are many ways to unload, mainly the following methods:
a. Shearing machine cuts the material. It uses the shearing machine to cut out the length and width dimensions of the expanded drawing. If there are punching and corner cutting, then the punching machine is combined with the die to punch and corner to form.
b. Punch blanking. It is the use of a punch to punch the structure of the flat part after the parts are unfolded on the plate in one or more steps. Its advantages are short labor hours, high efficiency, and can reduce processing costs. It is often used in mass production.
c. NC CNC blanking. When NC blanking, you must first write a Cnc Machining program. That is, use the programming software to write the drawn expanded diagram into a program that can be recognized by the NC CNC machining machine. Let it follow these programs step by step on a piece of iron plate On the top,punch out the structural shape of its flat parts.
d. Laser cutting is the use of laser cutting to cut the structure and shape of the flat piece on an iron plate.
4. Flanging and tapping. Flanging is also called hole extraction, which is to draw a slightly larger hole on a smaller base hole, and then tap the hole. This can increase its strength and avoid slippage. Generally used for sheet metal processing with relatively thin plate thickness. When the plate thickness is large, such as the plate thickness of 2.0, 2.5, etc., we can tap directly without flanging.
5. Punch processing. Generally, punch processing includes punching and cutting corners, punching blanking, punching convex hull, punching and tearing, punching and other processing methods to achieve processing purposes. Its processing requires corresponding molds to complete the operation. There are convex molds for punching convex hulls, and tearing forming molds for punching and tearing.
6. Pressure riveting. As far as our factory is concerned, pressure riveting studs, pressure riveting nuts, pressure riveting screws, etc. are often used. The pressure riveting method is generally completed by a punch or hydraulic pressure riveting machine. Riveted to the sheet metal part.
7. Bending. Bending is to fold 2D flat parts into 3D parts. Its processing requires a folding bed and corresponding bending molds to complete the operation. It also has a certain bending sequence, and the principle is to make the next cut The first fold that does not cause interference will produce the interference back fold.
8. Welding. Welding is the group welding of multiple parts together to achieve the purpose of processing or the edge welding of a single part to increase its strength. The processing parties generally include the following: CO2 gas shielded welding, argon arc welding, Spot welding, robot welding, etc. The selection of these welding methods is based on actual requirements and materials. Generally speaking, CO2 gas shielded welding is used for iron plate welding; argon arc welding is used for aluminum plate welding; robot welding is mainly in-material It is used when the parts are large and the welding seam is long. Such as cabinet welding, robot welding can be used, which can save a lot of tasks and improve work efficiency and welding quality.
9. Surface treatment. Surface treatment generally includes phosphating film, electroplating colorful zinc, chromate, baking varnish, oxidation, etc. Phosphating film is generally used for cold-rolled plates and electrolytic plates, and its function is mainly to plate on the surface of the material. A protective film is applied to prevent oxidation; the second is to enhance the adhesion of its baking paint. Electroplated multicolored zinc is generally treated with cold-rolled plate surface treatment; chromate and oxidation are generally used for surface treatment of aluminum plates and aluminum profiles; its specific surface The choice of treatment method is based on the customer's requirements.
Chlor-alkali Chemicals suffer from stoppages
On December 25, Shanghai Tianyuan Huasheng Chemical Co., Ltd. (a wholly-owned subsidiary of chlor-alkali chemical industry (hereinafter referred to as Tianyuan Huasheng), a subsidiary of Shanghai Tianyuan Huasheng Chemical Industry Co., Ltd., located in Shanghai Chemical Industry Park Production facilities, quietly standing in the factory area, enjoying the winter sunshine. And it has been so quiet for two weeks.