Author: William

Hardware stamping dies need to go through several major processes

Machining metal stamping dies requires cutting steps, at least cutting or sawing the blanks on the die steel raw materials, and then rough machining. The surface and size of the fresh blank is relatively poor, so you need to go to the previous grinder for rough grinding. At this time, it belongs to rough machining, so the size requirement is not high, and the tolerance of 50 threads is generally enough. After rough machining, heat treatment is required. Generally, heat treatment is processed by a special heat treatment plant. There is not much to introduce in this area.

After the heat treatment, finishing is required. Generally, the grinding machine is used for finishing first. At this time, the size requirements are more stringent. Generally, the accuracy is about 0.01. Of course, this accuracy is not. The specific accuracy requirements should also refer to the complexity and precision of the metal stamping parts that need to be processed by the metal stamping die.

After the grinding machine is processed, the design drawings before the installation are processed. Generally, the hole is threaded first, and then the wire is cut to cut the required size and shape according to the drawing, and then the milling machine, CNC, etc. are used as the case. This specific also depends on the complexity of the metal stamping parts.

The equipment needed for metal stamping die includes sawing machine, lathe, wire cutting, electric spark, milling machine, drilling machine, grinder, etc. These are also equipment that a qualified metal stamping die fitter needs to operate skillfully.

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Plastic Mold Sprue

The Sprue

The sprue is a round, tapered hole which leads the plastics material from the nozzle of the heating cylinder of the injection molding machine to the distributing runners in the mold. A typical sprue is shown in Fig. below.

The heater nozzle makes contact with the sprue bushing at the small end of the taper, against some sort of accurately fitting seat which in this diagram is shown to be spherical.

The diameter of the small end of the sprue should be .015″ to .025″ larger than the orifice at the end of the heater nozzle.

sprue

This provides sufficient margin for possible variation in nozzle and mold alignment, so the portion of the sprue which breaks off inside the nozzle when the mold opens will not overhang the hole in the bushing and prevent free passage of the sprue through it.

The size of the nozzle and sprue employed for a specific molding application should be in proportion to the size of the shot or charge of material required to fill the mold.

Large sprues generally provide better flowing conditions than small sprues, and do no particular harm except to increase the amount of sprue scrap which must be reprocessed and used again.

A taper of 2°-30′ on a side is need

This is a practical amount which will insure easy release of the sprue but which will not increase the diameter of the large end unduly for a long sprue.

The taper should be reamed smoothly, without tool marks, and it should be polished.

Rough sprues may cause losses of as much as 10 seconds in the molding cycle because of the extra time the molded material requires to cool and harden sufficiently to permit it to be pulled out of the rough hole.

The use of a standard taper angle for all of the sprue bushings manufactured in a single shop makes it possible to use a single reamer for reaming a wide range of diameters and lengths.

The shoulder on the sprue bushing should be rather long, because there is possibility of encountering large thrusting forces which tend to push the shank through the shoulder.

A generous radius where the diameter changes avoids stress concentration and hardening cracks. A radius at the large end of the sprue, where it meets the runner, improves the flowing conditions for the material.

Mold steel should be used in making the sprue bushing, because it should be hardened to 40-45 Rockwell C. This makes the bushing resistant to crushing and brinelling, and thus it helps in maintaining good seating of the nozzle, which prevents the molding material from leaking out at this junction.

Also, lodged or stuck sprues may be hammered out with a rod of brass or other soft metal without damaging the seat or taper.

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How to avoid the accident of CNC lathe?

For CNC lathe tool collision accidents, personal accidents or equipment accidents may occur if the safety operation regulations of the lathe are not followed. In the process of processing, because most of them are equipped with safety protection doors, the safety doors are required to be closed during processing, and the operator does not directly operate the machine tool. Therefore, the probability of personal accidents is very small, but the probability of equipment accidents is much greater than that of other mechanical processing. , When operating the machine tool, technicians often make programming mistakes, input errors, and make corrections, and the coordinate system or tool compensation is driven into the error. Carelessness when operating the machine tool will cause a tool collision accident. If the tool crash occurs during the use of the CNC lathe, it will not only bring great psychological pressure to the operator, but also cause certain economic losses. So how to avoid and prevent it?
In fact, the occurrence of tool collision accidents can be followed regularly. Because the software is used for locking during Cnc Machining, it is not intuitive to see whether the machine tool is locked in the simulation interface when the automatic operation button is pressed during simulation processing. live. There is often no tool setting during simulation. If the machine tool is not locked and running, tool collision is very likely to occur. Therefore, you should go to the running interface to confirm whether the machine tool is locked before simulating processing. Forgot to turn off the air transport switch during processing. Because in the program simulation, in order to save time, the dry run switch is often turned on. There is no reference point return after the dry run simulation. When verifying the program, the CNC lathe is locked and the tool is in the simulation operation relative to the workpiece processing (absolute coordinates and relative coordinates are changing). At this time, the coordinates do not match the actual position. The method of returning to the reference point must be used to ensure The machine zero coordinate is consistent with the absolute and relative coordinates.
When the CNC lathe is overtravel, you should press the overtravel release button and move it in the opposite direction manually or manually to eliminate it. However, if the direction of release is reversed, it will cause damage to the machine tool. Because when the overtravel release is pressed, the overtravel protection of the machine tool will not work, and the travel switch of the overtravel protection is already at the end of the travel. At this time, it may cause the workbench to continue to move in the overtravel direction, and eventually the lead screw will be broken, causing damage to the machine tool. When the specified line is running, it is often executed downward from the cursor position. For the lathe, it is necessary to call the tool offset value of the used tool. If the tool is not called, the tool of the running program segment may not be the desired tool, and it is very likely that the tool collision accident may occur due to different tools. Of course, the coordinate system such as G54 and the length compensation value of the tool must be called first on the machining center and Cnc Milling Machine. Because the length compensation value of each tool is different, it may cause tool collision if it is not called.

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Application of 3kw fiber laser cutting machine in stainless steel decoration engineering industryApplication of 3kw fiber laser cutting machine in stainless ste

Fiber laser Cutting Machine 3kw has become one of the main tools for modern enterprises to process metals. Laser cutting is to irradiate the workpiece with a focused high-power density laser beam to melt, vaporize, ablate or reach the ignition point of the irradiated material.

At the same time, the molten material is blown off by the high-speed air flow coaxial with the beam, thereby achieving workpiece cutting.Stainless steel is widely used in the decoration engineering industry due to its characteristics such as corrosion resistance, high mechanical properties, stable surface color, and color change depending on the angle of light. For example, in the decoration and decoration of local buildings such as entertainment clubs and public leisure places, it is used as a material for the production of decorative objects such as curtain walls, hall walls, elevator decorations, signboard advertisements, and screens at the front desk.

However, it is a very complicated job to make stainless steel plate into stainless steel products, and many manufacturing processes are required, such as cutting, folding, bending, welding and other mechanical processing procedures. Among them, the cutting process is an important process. There are many traditional processing methods for stainless Steel Cutting, but the efficiency is low, the molding quality is poor, and the demand for mass production is rarely achieved.

At present, stainless steel ipg fiber laser cutting machine are used in metal processing and decoration engineering industries due to their good beams, high precision, small slits, smooth cut surfaces, and ability to cut arbitrary graphics. With the increasingly fierce market competition, laser cutting will play an increasingly important role and bring economic benefits.

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Bathtub mould

Are you still searching for high quality, high performance, long life time and fast delivery bathtub mould?

China mould is the professional in making bathtub mould. We export bathtub to every country in the world. Due to the large mouldtooling equipments which we invest a lot of money and purchased them from Taiwan Germany Japan Italy and other countries make China professional in making large mould. For example: largest industrial garbage bin mould, big water can mould, big bathtub mould and so on.

China also provide you Bathtub Turnkey Project also named one-stop service project which help you design the factory and purchase the related machines, we will serve you until making you successfully run your factory. For more information please feel free to contact me.

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Process flow of aluminum alloy die casting

is a kind of pressure-casting parts. It uses a pressure-casting mechanical machine equipped with a casting mold to pour the heated liquid aluminum or aluminum alloy into the inlet of the die-casting machine, and then die-cast by the die-casting machine to cast the mold Aluminum parts or aluminum alloy parts with restricted shapes and sizes. Such parts are usually called aluminum alloy die-casting.

Aluminum alloy die-casting has different names in different places, such as aluminum alloy die-casting parts, die-cast aluminum parts, die-cast aluminum parts, die-cast aluminum, aluminum alloy die-casting, aluminum alloy die-casting parts, etc.

Because metal aluminum and aluminum alloy have good fluidity and plasticity, and the casting process is cast in a pressure die-casting machine, aluminum alloy die-casting can make a variety of more complex shapes, and can also make higher precision and Smoothness, which greatly reduces the machining amount of castings and the casting allowance of aluminum or aluminum alloy, not only saves electricity, metal materials, but also greatly saves labor costs; aluminum and aluminum alloys have excellent thermal conductivity , Small specific gravity and high workability; thus aluminum alloy die casting is widely used in automobile manufacturing, internal combustion engine production, motorcycle manufacturing, electric motor manufacturing, oil pump manufacturing, transmission machinery manufacturing, precision instruments, landscaping, power construction, architectural decoration And so on in various industries.

Aluminum alloy die-casting can be manufactured into aluminum alloy die-casting auto parts, aluminum alloy die-casting automobile engine pipe fittings, aluminum alloy die-casting engine cylinders, aluminum alloy die-casting gasoline engine cylinder heads, aluminum alloy die-casting valve rocker arms, aluminum alloy die-casting valve seats, aluminum alloys Die-casting power accessories, aluminum alloy die-casting motor end covers, aluminum alloy die-casting shells, aluminum alloy die-casting pump shells, aluminum alloy die-casting construction accessories, aluminum alloy die-casting decorative accessories, aluminum alloy die-casting guardrail accessories, aluminum alloy die-casting aluminum wheels, etc. .

The four basic processes in the die-casting aluminum industry are annealing, normalizing, quenching and tempering. These four processes are called the “four fires” in die-casting. In the process of die-casting, the relationship between quenching and tempering is very close. , Both are indispensable.

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Basic Knowledge of Manual Laser Welding

1. What is laser welding?

Laser welding is a common welding technique in which the laser output from the laser is transmitted into the optical fiber through the coupling system, and then focused on the workpiece through the laser output system. Laser welding can be divided into manual laser welding and automatic laser welding according to the operation mode.

2. Specific application of manual laser welding

Today, most manual laser welding equipment uses fiber lasers. The laser achieves long-distance output through optical fiber, so it is more popular with users in terms of beam quality, light spot, energy loss and welding freedom. The equipment is streamlined, flexible to use, and the price is cheap. The focus is on the point where the welding function and process quality are better than the hard light path. The welding machine is more powerful, and some manual fiber laser welding machines adopt the new technology of swinging the laser welding head to realize the adjustment of various parameters such as the light spot, so the user does not need to worry that the distance between the workpieces is a little too large and the welding will be affected ( the welding can be achieved between general distance of 3-5MM). Therefore, manual laser welding can significantly improve the application function and scope of welding and reduce the difficulty of welding.

In addition, because the handheld fiber laser welding machine adopts fiber laser, it is easy to maintain, even without maintenance. As long as it is cleaned daily, there is no loss of consumables. Therefore, it is widely used in welding materials such as metal and thin plates, which solves the problem of cabinets, kitchens, toilets, stairs and elevators. A series of complicated and irregular welding process problems in industries such as, shelves, ovens, stainless steel doors and windows guardrails, distribution boxes, and stainless steel home furnishings.

Of course, manual laser welding is not a panacea. When operating different workpieces, you still need to refer to different requirements for selection.

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Causes of errors in laser cutting machines


1. The thickness of the cutting material exceeds the standard.

The thickness of the plate that can be cut by a general metal laser Cutting Machine is less than 12 thicknesses. The thinner the plate, the easier it is to cut and the better the quality. If the plate is too thick, the laser cutting machine will be difficult to cut. Under the condition of ensuring the cutting, the processing accuracy will be error, so the thickness factor of the plate should be determined.

2. The laser output power is not up to standard.

When the laser cutting machine is commissioned, it is necessary to ensure that the laser output power reaches the standard. Generally, the higher the laser output power, the better the cutting quality on the same thickness of the plate.

3. The roughness of the cut sheet.

In general, the smoother the surface of the cutting material, the better the cutting quality.

4. The focus position is not accurate.

If the focus of the laser cutting machine is not aligned, it will directly affect the cutting accuracy, so it is necessary to calibrate and check before running. You can also purchase LXSHOW auto-focusing laser head when you choose the machine, auto-focusing, to ensure the cutting accuracy.

5. Processing speed.

The cutting speed of the laser cutting machine directly affects the processing accuracy. Therefore, before the operation, the cutting speed and the material should be matched to the best degree.

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How to Choose the Right Toolholder

The importance of choosing the optimum toolholder is substantial as the quality of the toolholder has a great influence on the results of the complete machining process.

Although it has minor importance with regard to value when compared to a complete machining center, the toolholder is an important connection between the machine spindle and the cutting tool. The importance in choosing the optimum toolholder is substantial as the quality of the toolholder has a great influence on the results of the complete machining process.

The most important requirements for a toolholder are the gripping force at high speeds as well as the run-out accuracy and balancing quality, which reduce vibrations. Toolholders need to have a run-out accuracy of less than 0.003 mm. To support the high dynamic of the linear actuation of the machine, a low weight of the spindle, toolholder and tool combination is beneficial to receive superior cutting results.

Customer requirements with regard to the cutting results of a toolholder are usually clearly defined and there are different types of toolholders available in the market that could fulfill these requirements.

Depending on the specific application of the customer, it will be possible to find the perfect toolholding system as the different systems offer different technical features and advantages. We will concentrate on the following four kinds of toolholders: (1) hydraulic toolholders, (2) toolholders for polygonal clamping, (3) universal toolholders and (4) heat shrinking holders.

Hydraulic Toolholders
Special toolholding solutions are applied for particular customer solutions. There is one toolholder that can be applied for most of the applications—a hydraulic toolholder (see Figure 1).

Figure 1: Hydraulic toolholder. Figures courtesy of Schunk, Inc.

A hydraulic toolholder uses a different way of clamping the cutting tool compared to systems of conventional toolholders. Introduction of force is done via a screw (with a screw, a piston and sealing). By actuating (turning) the screw, an even hydraulic pressure is generated inside the toolholder. This pressure is transmitted via a steel expansion sleeve, which clamps the tool.

With this clamping system, best run-out accuracy and a repeatability of less than 0.003 mm (0.00012”) are achieved. As the cutting tool is held in a hydraulic chamber, the toolholder offers superior damping effects, due to the oil in the holder. The user gets a higher surface quality of the workpiece and higher up-times of the toolholder as small eruptions of material, as a result of vibrations of the cutter, are avoided.

These toolholders are not only maintenance-free and resistant against dirt, but they also are easy to use and offer a safe clamping of the cutting tool.

Toolholders for Polygonal Clamping
The polygonal clamping system (see Figure 2) is one of those highly engineered devices that is surprisingly simple: a ground polygon-shaped bore rigidly clamps a cutting tool in three places.

Figure 2: Polygonal clamping system.

For high-speed applications, polygonal clamping is a great solution since the clamping of the tool shank is done by the elastic deformation of the holder. The main advantage of these toolholders is its extremely slim design.

There are two versions available on the market to cover different applications. A slim version of the toolholder, which stands out with its extremely slim design of the tool shank and its long reach of the tool. It is even possible to use shorter cutting tools with this holder, which in return, results in lower costs for the user. The rigid version of the toolholder has a bigger, and therefore, stiffer body of the holder and offers better qualities with regard to radial force compensation. Both versions can be used with long extensions, which make them even more flexible for difficult machining tasks.

Clamping of the tool or an extension is done within the elastic range of the material of the tool shank. Therefore, there are no restrictions with regard to the lifetime of the tool. Changing a tool can be done within seconds by using an external clamping device. This device does not need any external power source and therefore can be used anywhere. This fact makes polygonal clamping systems very interesting for applications that require a frequent tool change.

Universal Toolholders
The third toolholding system to be discussed are universal toolholders (see Figure 3). With two choices available—one for light-duty applications and one for medium- to heavy-duty applications—users have the possibility to gain the very important advantage of vibration damping for improved tool life and workpiece surface finish at a price point competitive with most high-end colleted toolholder systems.

Figure 3: Universal toolholders.

These toolholders clamp tools using expansion technology similar to hydraulic toolholders, only the expansion is achieved via mechanical means instead of through a hydraulic fluid medium. This results in a toolholder system that provides the user with vibration damping and high runout accuracy—less than 0.005mm measured at the face of the toolholder.

Additional features of universal toolholders—when compared to colleted-style toolholder systems—are the ability to tighten the toolholders to a hard stop (no torque wrenches are required); a tight and secure clamping of the entire shank of the round tool (collets clamp more tightly near the nose of the toolholder and less tightly at the bottom of the clamping bore); flexible clamping through the use of standard intermediate sleeves; and, very accurate axial length adjustment through the use of an internal length adjustment screw.

Heat Shrinking Technology
The fourth toolholding system to note is heat shrinking technology (see Figure 4). This technology is based on heating up and cooling down a toolholder through induction technology.

Figure 4: Heat shrinking holder.

An induction coil—with some units using a high frequency coil—heats up the toolholder precisely at the area where the tool has to be inserted. After inserting the cutting tool, you need to cool the toolholder, which can be done via a cooling jacket. Cooling down the toolholder will cause the holder to shrink around the cutting tool shank. In this way, the cutting tool is clamped and offers a force conclusive grip, which allows high torques.

The result of the shrinking process is an almost homogeneous tool with many advantages. Main benefits of the heat shrinking technology include high run-out accuracy of less than 0.003 mm, high transmissible torques and a relatively slim toolholder design. If it comes to vibration dampening, hydraulic toolholders or polygonal toolholders offer better qualities than heat shrinking toolholders.

Summary
What kind of toolholding system is the best? An answer to this question cannot be given generally as this depends on the particular application of the customer. When choosing the right toolholder, one basic requirement is that you know the static and dynamic characteristics of the toolholder. These characteristics have to be considered when examining the customer application and to be able to determine safe and effective machining parameters.

A comparison of the different tool-holders is very difficult, as they offer different benefits with regard to working principle, design and measures. A rating should only be done when considering the requirements of the particular application at the same time. A very rigid tool-holder is not appropriate for every application. A toolholder, which is perfectly suitable for high-speed machining, may not offer the needed values with regard to some other requirements.

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Learn about laser welding technology in one article

Laser welding is a process that uses the radiant energy of the laser to achieve effective welding. Its working principle is to excite the laser active medium (such as a mixture of CO2 and other gases, YAG yttrium aluminum garnet crystals, etc.) in a specific way. It oscillates back and forth in the resonant cavity to form a stimulated radiation beam. When the beam contacts the workpiece, its energy is absorbed by the workpiece, and welding can be carried out when the temperature reaches the melting point of the material.

Laser welding can be divided into heat conduction welding and deep penetration welding. The heat of the former diffuses into the workpiece through heat transfer, and only melts on the surface of the weld. The interior of the workpiece is not completely penetrated, and there is basically no vaporization phenomenon. It is mostly used for low-speed thin-walled. Welding of materials; the latter not only completely penetrates the material, but also vaporizes the material to form a large amount of plasma. Due to the large heat, a keyhole phenomenon will appear at the front of the molten pool. Deep penetration welding can completely penetrate the workpiece, and has large input energy and fast welding speed. It is currently the most widely used laser welding mode.

Advantages of laser welding

  • ① The use of laser welding can obtain high-quality joint strength and larger aspect ratio, and the welding speed is relatively fast.
  • ② Since laser welding does not require a vacuum environment, remote control and automated production can be realized through lenses and optical fibers.
  • ③ The laser has a large power density, has a good welding effect on difficult-to-weld materials such as titanium, quartz, etc., and can weld materials with different properties.
  • ④ Micro welding is possible. After the laser beam is focused, a small spot can be obtained, and it can be accurately positioned, which can be used in the assembly welding of micro and small workpieces that are automatically produced in large quantities.

Disadvantages of laser welding

  • ① The price of the laser and the parts of the welding system is relatively expensive, so the initial investment and maintenance costs are higher than the traditional welding process, and the economic benefits are poor.
  • ② Because the solid material has a low absorption rate of laser, especially after plasma (plasma has an absorption effect on laser), the conversion efficiency of laser welding is generally low (usually 5% to 30%).
  • ③ Due to the small focus spot of laser welding, the equipment precision requirements of the workpiece joint are relatively high, and small equipment deviations will produce large processing errors.

Is laser welding harmful to people?

The invisibility and energy of the laser emitted by the welding machine is too high. Non-professionals should not touch the laser source, otherwise it will be very dangerous. In addition, lasers are also electromagnetic waves, but the wavelengths of lasers used in welding machines are very large, so there is no radiation hazard from short-wavelength light waves such as ultraviolet rays.

Many gases are generated during the welding process, but most of them are inert gases, which are not toxic. However, it depends on the different welding materials. It is best to take protective measures to reduce gas inhalation.

The laser emitted by the welding machine has almost no radiation hazard, but there will be ionizing radiation and stimulated radiation during the welding process. It is best to stay away from the welding part during the welding process. This kind of induced radiation has no shortage of shortwaves, and it has a great impact on the eyes and body. It is best to stay away from the solder joints. Try to take protective measures for close work, such as wearing respiratory protective equipment, wearing radiation protective clothing, and wearing goggles.

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