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What errors may occur during CNC machining and CNC machining​?

 CNC machining and numerical control machining are a method to control the movement of machine tools and the production process of machining through computer digitization and information digitization. It is an intelligent numerical control device developed as an economical, high-speed, reliable, multi-functional, intelligent, and open structure. CNC machining is also an important indicator that can measure the continuous level and comprehensive ability of a safety technology, as well as the degree of modernization of related science and technology capabilities, especially in aviation, biology, medical and other high-tech cultural industries, and it is also a powerful indicator. reflect. So, what errors may occur during CNC machining and CNC machining? Let us understand together:   The use of approximate machining motion or approximate tool contours causes errors in the CNC principle of machining. The reason why it is called machining principle error is because of the error in machining

What are the rules for metal stamping die scrap tube?

The Purpose Standardize the management of the scrapping of the company's metal stamping dies, prevent the loss of company assets, and formulate this system specially. Scope of application It is suitable for the management of the company's scrap molds. Definition If the molds listed in the assets of the company fall under one of the following circumstances, the use management department may apply for scrapping. 1. Molds that exceed the specified service life. 2. The mold is severely damaged by accidents or accidents, and molds that cannot be repaired or have no repair value. 3. Metal stamping dies that have not reached the service life, but due to safety, quality, efficiency and other issues, the repair still fails to meet the minimum requirements of the customer's product process or affects the production safety and efficiency. 4. Product customers have stopped placing orders or have not placed orders for molds in several years. 4. Responsibilities 1. Responsibilities of th


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Preset of compression technique of auto parts guard cover and its mould

It can be seen that the dimensional accuracy of the part processed by deep drawing can meet the dimensional accuracy requirements of the part. This part is an appearance part, which has high requirements on appearance, so it should be considered when arranging the process sequence and mold design.

Process plan determination According to process analysis, the possible process plans are mainly as follows: Option 1: Blanking deep drawing (outer edge 5424, height 22) → reverse drawing (inner circle shape 5257) → shaping (inner and outer edge) → Punching (10 to 558 flanging bottom hole) → flanging (10 holes) punching the inner hole 5251.

Plan two: deep drawing 5257 → shaping → trimming and punching → flanging (outer edge) → punching (10?558 flanging bottom hole) → flanging (10?558). Scheme 3: Drawing 5257 → shaping → trimming and punching (5251, 10?558 flanging bottom hole) → flanging (outer edge and hole edge).

The advantages of the first plan: blanking and pulling the outer edge is conducive to forming the outer edge, and the blanking and deep drawing are compounded together, which can reduce the number of molds. Reverse drawing is conducive to the forming of the part and to ensure the quality of the appearance of the part. , Punching and flanging to separate the mold is simple, high strength.

The shortcomings of the first plan: due to the large drawing depth (36mm) of the reverse drawing process, the metal flow is difficult, and the material can only be formed by thinning, so the part is easy to be cracked. The blank size is not easy to adjust due to the blanking and deep drawing composite, and the mold is more complicated.

The advantages of the second plan: the drawing blank adopts square material, and the size of the base blank can be adjusted according to needs. The drawing die (inner straight cylinder) is simple and easy to manufacture. The central hole of the 5251 trimming and punching hole is positioned, which is easy to ensure the concentricity (hole and shape). , 10?558 flanging bottom holes and 5251 holes are punched separately to ensure the strength of the mold. , The first step of deep drawing can use a large radius circular arc concave die, thereby improving the appearance quality of the drawn part, and also facilitating the flow of metal materials, which is conducive to the progress of the drawing.

The shortcomings of the second plan: 6 sets of molds are required, and there are many procedures, but the molds are relatively simple and easy to manufacture. It is more suitable for our factory’s small batch production of bus chassis. Solution three advantages: 4 sets of molds are required, which is relatively small. It has the 1, o, and advantages of the second scheme. Disadvantages of scheme three: 10 to 558 flanging bottom holes and 5251 holes are punched out at one time, the wall thickness of the mold cavity is small, and the mold strength is poor. Turn the edge of the small hole and the outer edge at the same time, the hole is easy to deform. Moreover, the wall thickness of the mold cavity is small and the strength is poor.

Through the above comprehensive analysis, it can be seen that the second option is more reasonable, the mold structure is simple, and the part size is easy to guarantee. Therefore, the second option is selected as the process plan for this piece. Technological calculation: the unfolded diameter D0 of the part shape curve segmented blank is calculated according to the calculation method of the blank size of the deep drawing part of the rotating body with complex shape, such as. Divide the generatrix (ie contour curve) of the drawing parts into simple straight lines and arc segments 1, 2, 3, 4, 5, 6, 7, 8, 9, 10. Calculate the length of each straight line and the length of each arc and The distance from each segment to the axis of the workpiece.

Determine one-time drawing height and one-time deep-drawing die fillet radius. Because the diameter of the workpiece is d=259>200, the die fillet radius is determined by the following formula. The fillet radius of the drawing punch r convex = (0.6~1) Xr concave=(0.6~1) X12=7~12 the fillet radius of the part r concave=3<rconcave 1minr convex=3<rconvex 1, so it is needed In the shaping process, the rounded corner radius shown in the drawing can be achieved by shaping the part once.

Process trimming and punching die The structure of the die is as shown in (1). The edge trimming and punching are performed by positioning the outer circle of the stretched part to ensure the concentricity of the trimming outer circle 5452 and the central hole 5251 with the straight cylinder circle 5257. (2) Three scrap knives (piece 26) are used to cut the surrounding scraps, making it easy and safe to take out the scraps. (3) The upper die adopts rigid return material (pieces 8, 11, 12) in order to use the punching mechanism of the press. </rConcave1minrConvex=3

Conclusion The design of the process and the mold is in line with the actual situation. After the actual pressure test, it can meet the quality requirements of the imported products and achieve the expected purpose.

The automotive parts and parts machining, PTJ Shop offers the highest degree of OEM service with a basis of 10+ years experience serving the automotive industry. Our automotive precision shop and experts deliver confidence. We have perfected the art of producing large component volumes with complete JIT reliability, backed by the quality and long-term reliability our customers expect.

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