For friends who have been in contact with the radiator component industry, they often see or hear "CNC machining", but too much exposure does not necessarily mean that many people understand. In fact, many questions are still about CNC machining. What are the advantages? Let's take a closer look. CNC machining is an index-controlled machine tool machining, which is a method of using digital information to control the machining process. Traditional mechanical processing is done manually by machine tools. During processing, the mechanical cutter is shaken to cut metal, and the accuracy is measured with calipers and other tools. However, traditional artificial intelligence processing is far from being able to meet the needs of production development. Therefore, the emergence of CNC machining provides the possibility for the standardization, precision and efficiency of mechanical product processing. The CNC machining process in the radiator component industry also shines. The
Mold material The performance of the molding material should not only ensure the convenient production of investment molds with accurate dimensions and high surface finish, good strength and light weight, but also create conditions for the manufacture of mold shells and good castings. Molding materials are generally formulated with waxes, natural resins and plastics (synthetic resins). All mold materials mainly prepared with wax materials are called wax-based mold materials, and their melting point is low, 60~70 ° C; all mold materials mainly prepared with natural resins are called resin-based mold materials, with a slightly higher melting point, about 70 °C. ~120℃. invest-casting.com Precision Investment Castings China prototype company service include : High Quality Investment Casting Parts Custom , Lost Wax Investment Casting Sand Casting , Lost Foam Casting , Gravity Casting , Die Casting , Graphite Casting , Casting Moldsmanufacturers . Manufacture of Folding Investments In 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
As shown in Figure 1-1, the material must be stainless steel, the material thickness must be 0.5 mm, and the dimensional accuracy of the workpiece must meet the drawing requirements. Unmarked accuracy according to IT12 level, the production program has an annual production of 100,000 pieces.
Part process analysis
The shape of the workpiece is simple, the size and thickness are modest, and it is generally mass-produced. Although it belongs to normal press parts, please note the following points when designing cold press dies.
2. The outline and structure of the part is simple, but some hole machining needs to be considered.
A, two two-hole position requirements,
B, by assembly
C, the two holes must have the same
D, shaft requirements
E, its value is 0.15 mm.
The difficulty in processing this portion is mainly the positioning of the center distance of the hole 2.
Since some holes have a small diameter and a particular batch size, the design of the mold material and structure should be emphasized to guarantee a particular mold life.
Process planning decisions
According to the analysis of the process of the workpiece, the basic process includes punching, punching and bending. There are several types of processing methods and their rational processing methods in the following order.
1, blanking-punch-bending, single process stamping.
2, blanking-bending-punch, single process stamping.
It is not suitable to adopt this method because this part has some production batch, too many steps, reduces the accuracy of the product, and the production efficiency of this method is not suitable for mass production.
Scheme 2) It is also a one-step stamping die.
In addition to the drawbacks of Method 1, it is difficult to secure the position accuracy of the holes, and it is difficult to secure the lack of positioning accuracy in bending, so it is not appropriate to adopt this method.
Scheme 3) Composite stamping die.
Due to the structure of the parts, the thickness of the material is thin, and punching and punching are completed once. Therefore, it is best to adopt this scheme. The specific plan is as follows.
Process parameter determination
1. Calculation of blank size
Calculation of external dimension length
The relative bend radii of the part are:
R / t = 2 / 0.5 = 4> 0.5
Where X is the experimentally determined strain-neutral layer displacement coefficient.
T material thickness
Apparently, for parts belonging to large bend radius members, the radius of curvature ρ of the neutral bend deformation zone should be determined.
Textbook p145 Neutral position calculation formula
Where X is the experimentally determined strain-neutral layer displacement coefficient.
Table 4-5 from p145 of the textbook takes X 0.42
Such:
ρ = R + Xt
= 2 + 0.42 × 0.5
= 2.21mm
Calculation formula for blank length of curved surface parts with large fillet radius (R> 0.5t)
L = ∑L straight + ∑L bend
L bend = [(180-a) / 180] * πρ
Therefore, the length of the part is shown in Figure 2-2.
The DE segment belongs to the process settings. The purpose is to reduce bending springback. The length of the DE segment is calculated as a straight line because it has a large radius and can be considered a straight line.
1. The width of the contour is calculated.
Considering the use of sheet materials and the convenience of layout, the process size of the work created by CAD is as follows. Outline width is L = 53.74 mm
2.Layout size calculation
Determining edge value
From Table 3-14 on page 46 of the textbook, we can see that the value of a1 between workpieces L> 50 is 2.2 * 0.8 = 1.76.
The value of side a is 2.5 * 0.8 = 2.
3. Calculate the width of the material
For convenience of mold design, the strip width calculation formula using the non-side pressure device feed method is as follows.
B = (D + 2a + Z) 0 −δ
formula
B-Basic size of strip width.
D-Maximum size of part profile in strip width direction
a –Side edge
Z—Gap between the guide plate and the widest strip
Δ—Negative deviation of strip width
Margin a is as above
Gap δ, shear tolerance Z Check textbook p47 Table 3-17 Measured value δ = 0.5mm, Z = 0.5mm
It is calculated by the above formula. B = (53.74 + 2 * 2 + 0.5> 0 –0.5 = 56.240 –0.5 mm)
Calculation step distance
Development view of parts (see Figure 2-3 on the right) Generated effective horizontal dimension Ls = 53.74mm
The formula for calculating the step interval is as follows:
L = Ls + a1
Where L is the step interval
Ls-horizontal effective size
A1-margin
L = 53.74 + 2 = 55.74mm
The nesting from which you can get the mold is:
According to the requirements, the material board specifications are 1500 x 800 x 0.5. Each board can cut 14 1500 x 56 strips with a material utilization of over 80%.
Calculate material utilization rate
Textbook p43 Style 3-19
η = nA / BL × 100%
η –About material use
A-The actual area of the blanking area within one step.
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