Most people who have had decoration experience can tell a bunch of sad stories that have been deceived, and widely spread a word among the decoration family: “renovated, economically messed up, lost all personality.†Experts remind consumers to buy building materials How long to keep your eyes open.
One trick: stealing a column
Some decoration companies can easily adjust the materials ordered by consumers, for example, buy a ceramic tile package, give you a first-class product, and get a second-class product when you pick up the goods; or the first item on the box is a top-quality product. Second grade products; for example, to help you choose is more than 100 yuan / square meter of wood, decoration is used more than 30 yuan / square meter of wood and so on.
Countermeasures: Look at the invoice and pay attention to the above business and item number. In addition, in order to prevent the package from being transferred, it is also necessary to unpack and inspect the goods one by one, and to watch the loading on the train. For the attentive consumers, carrying a calculator and measuring tools is also a good way to prevent being deceived.
Two tricky: Lack of two
This phenomenon often occurs in large quantities of small auxiliary materials, such as wood strips, tiles and so on. In real life, businesses often take a few tablets out of a few boxes of auxiliary materials purchased by customers. Because of the large number of boxes, customers will not examine them one by one and generally will not find them.
Countermeasures: Timely points. However, as accessories, such as paint, are quantified in terms of volume, it is difficult for consumers to inspect. Therefore, it is recommended that consumers choose the products of well-known brands and regular manufacturers.
Three tricks: refers to the deer for the horse
The vast majority of consumers do not have professional knowledge of building materials, often little understanding, and professional names and popular names of building materials are not on the number, so the confusion of consumers with a similar name is a trick that merchants commonly use, such as businesses may be shaped The birch and cherry, which are similar in color but distinct in texture, are mixed to deceive consumers.
Countermeasures: In addition to learning more about building materials in general, in the purchase, we must ask the seller to specify the floor name, grade, brand, and request a quality responsibility sheet on the receipt credentials. If you find a fake, you can This complaint. In addition, consumers can actually choose a reliable brand-name building materials trader. The building materials required for renovations can be bought together at one time, which can save a small amount of expenses and provide after-sales service. This is a very cost-effective choice.
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Although there are many types of tapping screws, they all have the following similarities:
(1) are generally made of carbonized carbon steel (accounting for 99% of total production). It can also be made of stainless steel or non-ferrous metals.
(2) The product must be heat treated. Carbon steel tapping screws must be carbonized and stainless steel tapping screws must be solution hardened. In order to make tapping screws to meet the requirements of the standard of mechanical properties and performance.
(3) The product surface hardness is high, the core toughness is good. That is, "soft inside strong outside". This is a major feature of tapping Screw performance requirements. If the surface hardness is low, it can not be screwed into the matrix; If the core toughness is poor, a twist will break, can not be used. So "inside soft outside steel" is self-tapping screw to meet the use of performance, very important requirements.
(4) The surface of the product needs surface protection treatment, generally electroplating treatment. Some product surface must be treated by phosphate (photostatting), such as wall panel self - tapping screws for photostatting.
(5) Production by cold heading process. It is recommended to use high-speed cold heading machine and high-speed wire rolling machine or high-speed planetary wire rolling machine. High speed is emphasized here to ensure product quality. Only the head of tapping screw produced by high-speed machine is well formed and the thread quality is high.
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