China Shenzhen Perfect Precision Product Co., Ltd. company news

Low-volume manufacturing is a specialized service that offers full production-quality parts but in volumes ranging from a single piece to a few thousand pieces. It’s ideal for moving an idea from the concept stage through prototyping, and from there as a bridge to full volume production. Low volume production is considered to be a specialized service because most manufacturers don’t want to do it. Their assembly lines and supply chains are optimized for large production volumes that leverage economies of scale. There is nothing wrong with that approach, because it’s the best way to ensure the lowest cost per piece. However, it usually requires large minimum order volumes and a commitment to expensive tooling. But what is a product developer to do if you want to start off with product volumes on the low end, from one part to one thousand? That’s where 7-swords can help.

There is not a given set of tolerances that fits all processes and materials. In every case, the final tolerances on your part will depend on a number of factors, including but not limited to: Part size Design Geometry The number, type and size of features Material(s) Surface finish Manufacturing process Once your order is confirmed, we will review your design and provide a Design for Manufacturing review, indicating any areas that may require modification in order to improve manufacturability. It’s helpful if you can specify which areas in your design have critical tolerances that must be met and which can be slightly modified if needed to reduce production time and cost. Here are some general tolerance guidelines: General tolerances for CNC machining in metal and plastic Plastic injection molding tolerances Reference charts for CNC metals and plastic injection molding materials General tolerance for metal 3D printing is +/- 0.5mm A shrinkage rate of +/- 0.15% is to be expected for vacuum casting All manufacturing and technical specifications need to be clearly specified in the 2D drawings in order to be followed.

Turning is an Abstractive machining process that uses a cutting tool, typically a lathe, to achieve a variety of shapes for end-use plastic, metal, wood, or stone parts. Briefly, the use of a rotating metal rod performs turning. At the same time, a cutting tool is held against a rigid piece of material, generally cylindrically shaped, to remove material and create final parts. Today, CNC (Computer Numerical Control) is the most common automated form of turning. Turning takes a fairly rigid material such as metal, plastic, stone, or wood and rotates it while carving it with a cutting tool that uses one, two, or three axes of motion, resulting in diameter and depths of remarkable precision. It is possible to perform turning on either the interior or exterior of a cylinder (also known as boring) to create cylindrical parts of different forms.

Automatic hot forging, cogging, impression die forging, open die forging, press forging, roll forging, swaging, and upsetting are the most common forging processes. Automatic hot forging involves feeding mill-length steel bars into one end of the machine at room temperature, and hot forged products emerge from the other end. Cogging is the successive deformation of a bar along its length using an open-die drop forge. The common application is to work a piece of raw material to the desired thickness. Open die and impression die (also called closed die) forging are drop forging processes, meaning there is a need for a raised hammer then “dropped” onto the workpiece to deform it according to the shape of the die. As their names imply, the difference between the two depends on the shape of the die, with the open die not fully enclosing the workpiece and the closed die enclosing it. Unlike the nearly immediate impact of drop hammer forging, press forging involves a slow application of continuous pressure or force. Press forging can be either hot or cold. The amount of time that the dies are in contact with the workpiece is measured in seconds in contrast to milliseconds with drop hammer forging. Roll forging is a forging process where there is a reduction of round or flat bar stock in thickness and an increase long. Swaging is a forging process in which the operator alters the dimensions of a workpiece thanks to the dies into which the workpiece is forced. Usually considered a cold working process, swaging may also be hot-worked. Upsetting also called upset forging, increases the diameter of the workpiece by compressing its length. It is the most widely practiced forging process based on the number of pieces produced. Engine valves, couplings, bolts, screws, and other fasteners are some examples of common parts made using the upset forging process.

There are three main classes of forging processes: Drawn out means the length increases, and the cross-section decreases. Upset means that the length decreases and the cross-section increases. Squeezed in closed compression dies, meaning that multidirectional flow is produced.

Laser engraving is the use of laser technology to engrave text and patterns on objects. The characters engraved by this technology have no nicks, the surface of the object is smooth, and the text and pattern will not wear out. Kindly note that laser engraving can be made only on flat surfaces. ONLY Ai and SVG formats are acceptable and meanwhile, mark the dimension and placement on the 2D technical drawings.

1. The market demand for some parts which are suitable for periodic production is cyclical and seasonal. If a special production line is adopted, it will not pay off. The processing efficiency is too low with ordinary equipment, the quality is not stable, and the quantity is difficult to guarantee. After the first part of the processing center is trial-cut, the program and relevant product information can be retained, and the next product reproduction can be started as long as there is a lot of preparation time. 2. It is suitable for machining high-efficiency and high-precision workpieces. Some parts need little, but it is a key part, which requires high precision and a short time limit. The traditional process requires multiple machine tools to coordinate the work, long cycle, low efficiency, in the long process flow, easy to be affected by human waste, thus causing great economic losses. , and the use of processing centers for processing, production is completely automatically controlled by the program, to avoid the long process, reduce hardware investment and human interference, and has the advantages of high production efficiency and stable quality. 3. Suitable for having the right batch of artifacts The flexibility of processing center production is not only reflected in the rapid reaction soil with special requirements but also can realize batch production quickly and have and improve the market competitiveness. A processing center is suitable for small and medium-sized batch production, especially small batch production, in the application of a processing center, try to make the batch larger than the economic batch, in order to achieve good economic results. With the continuous development of processing centers and auxiliaries, the economic batch is smaller and smaller, for some complex parts, 5-10 pieces can be produced, and even single-piece production can also be considered with the processing center. 4. Suitable for machining parts with complex shapes The application of four-axis linkage and five-axis linkage machining centers and the mature development of CAD/CAM technology have greatly increased the complexity of machining parts. The use of DNC makes the processing content of the same program sufficient to meet various processing requirements, making the automatic processing of complex parts very easy. 5. Other characteristics The machining center is also suitable for machining the workpiece with multi-station and concentrated processes and difficult to measure the workpiece. In addition, the workpiece that is difficult to clamp or can be completely positioned to ensure machining accuracy is not suitable for production in the machining center.

Machining includes manual machining and CNC (computer numerical control) machining. Manual processing means that people use their hands to control the foam or lathes, milling machines, drilling machines, grinding machines, tapping tools and sawing machines, etc. so that the processing work can be achieved. Suitable for simple and small batch production. CNC machining is a process in which mechanics use a wide range of computer-aided machines to complete various machining tasks. The equipment mainly includes CNC milling machine or CNC machining center, a CNC lathe or CNC lathe, a CNC grinder and so on. Today, most machine shops are equipped with CNC or computer numerical control machines and technology. A CNC machine converts the position of the workpiece on the X, Y, and Z axes into programming language by programming in the G code language and some software. Then, the controller of the CNC machine guides the axis of the machine through the code language, so that the workpiece is shaped into a certain shape. Precision-machined parts are then obtained. CNC machining is suitable for mass production and complex mechanical parts. CNC machines have many advantages over manual machining, and they create many advantages in the first place. They can run faster and save a lot of time. CNC machines can produce sound parts in minutes or even seconds, whereas skilled mechanics or artisans would normally spend hours making parts on manual machines. Because parts or components manufactured by CNC machines can run more efficiently and require less labor, parts or components with tight tolerances and beautiful surface finishes can be obtained at a lower total cost. CNC machine tools can also meet high standards of precision machining requirements. High tolerance requirements for +/- 0.005 MM or higher.   CNC machining in China has developed very rapidly in the past 30 years. To date, there are more than 40,000 companies engaged in various machining operations, totaling 3 million machines and more than 9 million people engaged in processing activities. China has long been the second largest manufacturer after the United States. In particular, processing is very dynamic in China's Pearl River Delta and Yangtze River Delta regions. Many of the very best and largest machinery manufacturing companies are based in the Pearl River Delta region cities such as Shenzhen, Dongguan and Guangzhou. They withdrew from the Chinese market very early and gained a good reputation for low prices, good quality, and high tolerance.

Numerical control technology originated from the needs of the aviation industry, in the late 1940s, an American helicopter company proposed. The initial idea of CNC machine tools, in 1952, the Massachusetts Institute of Technology developed a three-dimensional CNC milling machine. This type of CNC milling machine has been used for machining aircraft parts in the mid-1950s. In the 1960s, numerical control system and programming work is increasingly mature and perfect, numerical control machine tools have been used in various industrial sectors, but the aerospace industry is always the largest user of numerical control machine tools. Some large aviation factories are equipped with hundreds of CNC machine tools, mainly cutting machine tools. The parts processed by NUMERICAL control include integral panels, girders, skins, compartments, propellers, aero-engine casing, shafts, disks, blade mold cavities and special cavity surfaces of liquid rocket engine combustion chambers, etc. At the beginning of the development of CNC machine tools, CNC machine tools with continuous trajectory are mainly controlled by continuous trajectory. Continuous trajectory control, also known as contour control, requires the tool to move according to the specified trajectory relative to the parts. After the development of point control CNC machine tools. Point-position control refers to the movement of the tool from one point to another, so long as it reaches the target precisely in the end, regardless of the movement path.

The aluminum extrusion process is very popular in small batches or batch production. When we make some machinery parts in the aluminum extrusion process, we often encounter customer consultations like this. The finished aluminum parts often very easily break. Many customers are troubled by this problem. We have summarized our experience in processing aluminum alloy CNC machining for nearly 20 years to give some solutions and suggestions for this problem. How to control the hardness of the 6063 aluminum profile, and how to prevent the hardness of the 6063 aluminum extrusion from being low? Today we will introduce how to protect aluminum extrusion. First of all, the 6063 aluminum extrusion frame can not be too dense, there must be a gap between the material, especially the small material and thick material interval which are not ventilated, and the spacing between the pipe material and the small material and the plate material is larger. When the pipe material is placed below, it is advantageous for the aging cycle to supply air. Secondly, 6063 aluminum extrusion aging insulation, in strict accordance with the process requirements for aging, insulation time should be appropriate, beware of under-aging or over-aging, resulting in insufficient hardness. Once again, the 6063 aluminum extrusion should be installed separately from other alloys before the furnace is installed, so as to ensure effective aging. Due to the fact that the production is really the same as the furnace, the special alloy process is used for aging.   Finally, in the setting and control of the 6063 aluminum extrusion aging furnace temperature, usually, there is a certain error between the aging furnace temperature and the aging furnace surface temperature. When setting the table temperature, it should be set according to the actual temperature of the furnace, so the aluminum extrusion Pressure technicians should pay close attention to fluctuations in the aging furnace temperature. The 6063 aluminum extrusion produced by extrusion has low hardness before aging and cannot be used as a finished product. Therefore, in general, 6063 aluminum profiles must be aged to increase strength.