Slow wire walking, also called low-speed wire walking, is a kind of CNC machining machine tool that uses continuously moving fine metal wire as an electrode to pulse spark discharge on the workpiece to generate a high temperature of over 6000 degrees, ablate metal and cut into a workpiece. The principle of wire processing is the phenomenon that there is a gap between the wire electrode and the workpiece, and the metal is removed by continuous discharge. Since the slow-moving wire cutting machine adopts the method of wire electrode continuous feeding, that is, the wire electrode is processed during the movement, so even if the wire electrode is worn out, it can be continuously supplemented, so it can improve the machining accuracy of the parts and slow the wire. The surface roughness of the workpiece processed by the cutting machine can usually reach Ra=0.8μm and above, and the roundness error, linear error and dimensional error of the slow-moving wire cutting machine are much better t
How Do Cnc Swiss Machines Work Save 0 What Is Swiss Machine –The full name of the walking CNC lathe, it can also be called the spindle box mobile CNC automatic lathe, the economical turning and milling compound machine tool or the slitting lathe. It belongs to precision machining equipment, which can complete compound machining such as turning, milling, drilling, boring, tapping, and engraving at one time. It is mainly used for batch machining of precision hardware and special-shaped shafts. This machine tool first originated in Germany and Switzerland. In the early stage, it was mainly used for precision machining of military equipment. With the continuous development and expansion of industrialization, due to the urgent needs of the market, it was gradually applied to the machining of civilian products; the development of similar machine tools in Japan and South Korea Earlier than China, it was mainly used in the military industry in the early days. After the war, it was gradually
Spring Design Attention And Roll Forming Method The coiling characteristics and methods of springs are divided into cold coiling method and hot coiling method. Cold winding method: When the diameter of the spring wire is less than 8mm, the cold winding method is adopted. High-quality carbon spring steel wire is usually first cold drawn and then heat treated. After winding, it is generally not quenched, but only tempered at low temperature to eliminate the internal stress during winding. Hot-rolling method: Springs with larger diameter (>8mm) spring wire should use hot-rolling method. Hot rolled springs must be quenched and tempered at medium temperature. The Design Process Of Various Springs · Installation space: When designing a compression spring , it is necessary to have a clear understanding of the space required for the installation of the spring, in order to effectively grasp the basic manufacturing conditions of the compression spring, including the outer diam
1) Determine the size of the die. The blanking die uses an integrated die and a wire cutting machine. When the die position is placed on the die holder, the pressure center and handle center should overlap according to the pressure center data. The dimensions are calculated according to the relevant formula.
Mold thickness H = KL = 0.38 × 30 = 11.4 (mm) Mold thickness H = 15mm Mold wall thickness c = (1.5 ~ 2) H = (22.5 ~ 30) mm Set mold wall thickness to c = 25mm Die width B = L + 2c = 30 + 25 × 2 = 80 (mm) Set die width B = 80mm Die length L = L + 2S2 = 30 + 2 × 25 = 80 (mm) Set the die length to L = 80mm Die dimensions L x B x H = 80 mm x 80 mm x 15 mm
2) Select a typical combination The shape of the punch is 80mm x 80mm x 15mm, and the typical combination is 80x80x180 to 220 (GB2873.2-81). 7.2 Concave design 1) The position of the hole. Gets the position created from the layout. 2) Aperture type. Obtained with a leading edge size. 3) Blade foam. Straight tube type, reverse hole expansion, vertical wall height inspection 1-26 is 10 mm. 4) Pinhole. The size, number and location of each screw and pin hole is in the standard standard combination GB2873.2. 5) Material and technical requirements. The material is CrWMn, the heat treatment temperature is 60 to 64HRC, and the surface roughness is as shown in the figure below. 6) Drawing of mold parts. The design results are plotted as recesses as shown below. Drawing of mold parts
7.3 Punched punch design 1) Punch check. The cross section of the punch is large and the strength and rigidity cannot be checked. 2) Structural form of punch. The circular interface punch is trapezoidal and uses standard GB2873.2. Fixed with a fixing plate. 3) The size of the working part of the punch. Obtained with a leading edge size. 4) Calculate the length of the punch. Check standard GB2873.2 and calculate punch fixing plate = 20mm, hollow pad h2 = 12mm, punch thickness h3 = 25mm, L = h1 + h2 + h3 = 12 + 4 + 31 = 47mm. 5) Material and technical requirements. The material is selected from T10A and the heat treatment hardness is 58-62HRC. 6) Drawing of punch parts. Drawings of mold parts are derived from the design results shown below.
Punching parts diagram
2. Punch and die the design 1) Punch and die wall thickness. The minimum wall thickness of punch and die (75-40) / 2 = 17.5mm meets the minimum wall thickness requirement of flip chip composite type. 2) Structural form of punch and die. For the straight type, the shape is obtained from the position where the die-cut pattern is punched out. Fixing method: Fixing with screw fixing plate; 3) Dimensions of the working part of the punch and die. Obtained from the calculation of edge size. 4) Calculate the length of the convex and concave shapes. Cross section h1 = 20mm, unloading plate h2 = 14mm, elastic part mounting height t h3 = 20mm, unloading plate is higher than uneven die 1mm, standard to get a fixed plate with punch length See GB2873.2 for various combinations. L = h1 + h2 + t-1 = 53mm
5) Material and technical requirements. The material is Cr12, the heat treatment hardness is 58 to 62HRC, and the surface roughness is as follows. 6) Draw the convex and concave parts. The design results are plotted in concave and concave as shown in the following figure.
Diagram of convex and concave parts
3. Design of unloading parts 1) Unloading plate design The unloading steel sheet is made of 45 steel and has a quenching hardness of 40-45 HRC. The contour of the unloading plate is the same as the contour of the blanking die and is 15 mm thick. 2) Select the unloading screw Four unloading screws are attached to the unloading plate. The nominal diameter is 12 mm and the threads are M12 * 55 mm. The end of the unloading screw should have enough moving space for normal unloading operation. After removing the screw, the unloading screw plate must exceed 1 mm of the end face of the mold. If an error occurs, a washer should be installed between the screw and the drain plate to adjust the drain screw plate.
4. Select mold base and other parts Formwork specifications are selected according to the external dimensions of the mold. Select two sets of guide sleeves and guide posts, large and small. The guide column d / mm × L / mm is Φ32 mm × 2000 mm. The guide sleeve d / mm × L / mm × D / mm is Φ32 mm × 110 mm × 45 mm. The upper mold thickness H1 is 40 mm, the rear plate thickness is 10 mm, the fixed plate thickness is 20 mm, the unloading plate thickness is 14 mm, the die thickness is 25 mm, and the lower mold thickness is 45 mm. Mold closing height H H = 40 + 10 + 20 + 14 + 25 + 45-2 = 152 (mm)
5. Check the mold closing height and the related parameters of the press 5.1 Check the height of the closed type Must meet mold closing height H. Hmin-H1 + 10 ≤ H ≤ Hmax-H1-5 (Equation 8-1) Where the maximum closure height of the Hmax press; Hmin-Minimum closing height of the press. H1 pad thickness. According to the selected printing press J23-25, the parameter list of the inspection press is Hmax = 320mm, Hmin = 180mm, H1 = 50mm Import the above data into Equation 7-1 and 140 <H <265 After mold closing height H = 207 mm, open press J23-25 meets the requirements in the range of 140 mm to 265 mm.
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