hunkmachining

Agriculture is closely related to metalworking processes.

Modern agriculture is extremely efficient, largely thanks to a well-developed metal processing industry. The application of modern processing technology to agricultural machinery manufacturing can not only improve processing efficiency and quality, but also promote the development of agricultural machinery manufacturing to intelligence and automation, and continuously improve the speed and quality of agricultural machinery production.

METALWORKING SERVICES & PRODUCTS IN AEROSPACE Sheet metal stamping parts occupy a very important position in aero-engines with their unique advantages, and the range of application is very wide. From the fairing at the front end of the engine to the tail nozzle at the end, there are stamping parts everywhere. According to statistics, the number of stamping parts can account for more than 30%. The new aero-engine sheet metal stamping parts show the following trends: more complex shapes, higher requirements for dimensional and geometric accuracy, thinner materials, more use of new materials, good surface integrity and good fatigue resistance. These all pose new challenges to sheet metal stamping technology. Driven by the research and development needs of new materials, new structures, and high-tech sheet metal stamping parts, stamping technology has achieved unprecedented development. In particular, the special forming technology has made greater progress and development.

METAL WELDING Welding is a manufacturing process and technology to join metals or other thermoplastic materials such as plastics by heating, high temperature or high pressure. There are many types of welding. TIG(Tungsten Inert Gas), MIG (Metal, Inert Gas), GMAW (Gas, Metal Arc Welding), and arc welding are the most common welding methods. Hunkmachining offers welding services for various kinds of metals ranging from stainless steel and carbon steel. Our engineers will assist you with design to after sales. We are capable of designing welding tooling and custom gauge. Along with advanced welding equipment including a welding robot, we will offer the best welding solution for your project.

TYPES OF METAL WELDING

MIG WELDING - GAS METAL ARC WELDING (GMAW) MIG Welding (Melt Inert-Gas Welding) is a welding method that uses the molten electrode and the external inert gas (Ar or He) as the arc medium and protects the metal droplets, the welding pool and the high-temperature metal in the welding area.

TIG WELDING - GAS TUNGSTEN ARC WELDING (GTAW) TIG welding (Tungsten Inert Gas Welding), also known as non melting inert gas arc welding. TIG welding is the most commonly used welding method whether in manual welding or automatic welding of 0.5-4.0mm thick stainless steel. TIG welding with filler wire is often used for backing welding of pressure vessels, because the gas tightness of TIG welding is good and can reduce the porosity of the weld during pressure vessel welding. The heat source of TIG welding is DC arc, the working voltage is 10-95 V, but the current can reach 600 A. Workpiece is connected to the positive electrode of the power supply, and the tungsten electrode in the welding torch is used as the negative electrode. The inert gas is generally argon.

STICK WELDING - SHIELDED METAL ARC WELDING (SMAW) SMAW (Shielded Metal Arc Welding) refers to manual arc welding, which is an electric arc welding method using manually operated welding rods.

SMAW uses welding rod and workpiece as two electrodes. During welding, the workpiece is locally melted due to the high temperature and blowing force of the arc. Then an oval pit filled with liquid metal is formed on the workpiece, and this pit is called the molten pool. With the movement of the welding rod, the weld will be formed after the molten pool cools and solidifies.

METAL STAMPING Stamping is a cold stamping process, which is to cut, bend or shape the material into the finished shape and size in accordance with the mold with the punching force from the stamping machine.

DIFFERENT TYPES OF METAL STAMPING

METAL PUNCHING Metal punching service is a key part of Hunkmachining's services, mostly applied to automobile parts. We offer the service whether for aluminum, stainless steel or other metals. Equipped with various power punching machines up to 300 ton, we permit complex shapes and high-efficiency processing.

METAL BLANKING Blanking means a blank with dimension determined by the target end product, is punched out from the metal sheet by punching machine.

Metal sheet is generally placed on the female die and pressed downward by the male die. Then, blank with required shape and size is sheared out by the convex edge of the die while pressing. Sometimes the finished product can be obtained by blanking at one time.

METAL BENDING Metal Bending is a process by which metal can be deformed when a force is applied to an object, which causes it to bend at an angle and form the desired shape, which usually results in its "V" or "U" shape. Bending machine is a tool used to bend metal plates. It uses punches and dies to do this.

WHAT ARE THE ADVANTAGES OF METAL STAMPING? 01 Accuracy Precision is a significant factor especially in industry manufacturing. Any inaccuracy may inflict serious losses and damages. With the advanced stamping technology and die design, errors can be minimized in the production.

02 Cost-efficiency It reduces remarkable production time as well as the labor required. Based on that, companies can save plenty of cost by reducing the number of workers and running time of machines. As a result, customers can benefit a lower cost from those savings that reflect the product price.

03 High quality In addition to the advantages mentioned above, quality is also a major factor in the reason why choosing metal stamping. Through a long time of development, stamping parts have been proven to be so reliable that they are frequently used in many high-precision industries including aerospace and medical device.

WHAT MATERIALS CAN BE USED FOR STAMPING? Carbon Steel The versatility of carbon steel is outstanding because of its high ductility. It can be formed into various shapes by metal stamping. It is used in the automotive industry most commonly.

Stainless Steel Stainless steel has good resistance to corrosion and great durability, which makes it suitable for metal stamping. It is frequently used in medical industry and kitchenware as it is antibacterial(compounded with special element) and easy to clean.

Aluminum The density of aluminum is quite low comparing to its strength(high strength-to-weight ratio) and that makes it a good choice for metal stamping. Same as stainless steel, aluminum also has high corrosion resistance. Besides, it is a cost-effective material. Usually it is used in stamping for vehicles and agriculture machines.

Other Metal Materials Brass, copper, ferroalloy and some other alloys are also workable for metal stamping in some industries.

METAL PUNCHING

Metal punching service is a key part of Hunkmachining's services, mostly applied to automobile parts. We offer the service whether for aluminum, stainless steel or other metals. Equipped with various power punching machines up to 300 ton, we permit complex shapes and high-efficiency processing.

WORKING PROCESS OF METAL PUNCHING

01 Analyze the drawing. Design the proper mold and assign the punching machine with appropriate power.

02 Blanking, which means a blank with dimension determined by the target end product, is punched out from the metal sheet by punching machine.

03 Drawing. Drawing is a process to use the force from machine to extend the length of the metal piece and make it thinner to obtain the desired shape.

METAL HEMMING

Metal hemming is a process that involves folding the edge of the sheet metal to 180° onto itself. Then, two newly formed layers are flush with each other. Many automotive parts are produced by metal hemming, such as trunk lids, deck lids, hoods, tailgates and doors. There are 4 types of metal hemming: teardrop hem, closed hem, open hem and rolled hem. The closed hem is the most popular one as the process is simple. It is totally flush. However, it has material limitations, including thickness and angle limitations to avoid fracture.

WHAT IS THE PURPOSE OF METAL HEMMING?

Generally, metal forming is used to connect parts together to achieve a better appearance and strengthen the edges of parts.

HOW TO HEM MATERIAL WITH LOW FLEXIBILITY?

For some material such as aluminum, the closed hem is not an ideal choice, since the flexibility them are not enough and they are easy to break during the process. Instead, teardrop hem is the best choice for this material. It is a flange which is bent over more than 180° with only marginal inside radius change, and that is the reason why it can process that low-ductility without fracture.

WHAT IS THE DIFFERENCE BETWEEN METAL HEMMING AND METAL SEAMING?

Hemming and seaming are two very similar metalworking processing that both involve bending metal over onto itself. The difference is that seaming is to use a seam to join two layers of metal sheet together and two layers are not flush with each other while on the other hand   two layers are flush with each other with hemming.

METAL FLANGING

Flanging refers to the stamping process of turning the edge or outer edge of the hole on the workpiece into an upright straight edge with a die. It is included in the forming process of stamping.

WHAT IS THE ADVANTAGE OF METAL FLANGING?

It can process precision stamping parts with complex shape and good rigidity.

Improve the production efficiency. Save dies for some deep drawing parts. Reduce the manufacturing cost.

It can replace the deep drawing work of a complex shape workpiece, so flanging is especially suitable for small batch trial production.

Flanging is usually applied at the edge of the stamping part, which can effectively save the material.

WHAT SHOULD BE CONCERNED IN METAL FLAGGING?

1. The flanging degree of inner hole of stamping parts shall not be too large at one time.

Flanging is a stamping method that turns the workpiece with holes punched in advance into vertical flange along the hole edge. The deformation of hole flanging is from the tensile deformation of the material along the tangential direction, and the closer to the edges, the greater the deformation and the flanged area of workpiece gets thinner. Due to that, the hole edge may be cracked if not dealt properly. In order to prevent the cracking, the flanging degree of the inner hole of the workpiece must not be too large. If the flanging height is large, we can process flanging several times instead.

2. The flanging coefficient of punching flanging shall not be too small.

In flanging, the deformation degree is expressed by cofficient "K", which is the ratio of the aperture before flanging to the aperture after flanging. Obviously, the larger the value of K, the smaller the degree of deformation. On contrary, the smaller the value of K, the greater the degree of deformation, and more likely the edge of the flanging hole will be broken. The minimum value of K occurs with the maximum deformation degree which can be achieved without cracking the hole edge.

In order to prevent edge cracking, K shall not be too small and shall be greater than the minimum value introduced above. Experience shows that the minimum value of K is not only related to the type and performance of the material, but also to the relative thickness of the blank, and the shape of the product.

Metal deep drawing refers to a kind of machining process in which a certain shape of flat blank obtained after blanking is stamped into various open hollow parts or the open hollow blank is reduced in diameter and increased in height by using a die. Thin wall parts with cylindrical, stepped, tapered, spherical, box and other irregular shapes can be manufactured by drawing process. Cooperating with other stamping forming processes such as flanging, bulging, flaring and necking, it can also manufacture extremely complex parts.

WHAT IS THE ADVANTAGE OF METAL DEEP DRAWING?

1. High quality

With the help of mold, deep drawing products are accurate in shape and size, and the service life of mold is also very long in the production process. Therefore, the quality of deep drawing products is usually ensured.

2. Simple and efficient

Each step in the production process of deep drawing stamping parts is set up like a production line, so the operation of personnel is much simpler than that of some other stamping methods. The maintenance of the equipment is also more comfortable.

3. Energy saving and environmental protection

This advantage mainly comes from its special manufacturing process. During the process, most materials are reasonably used with relatively low energy consumption. This not only saves energy but also saves production costs. Therefore, it can improve efficiency for many industrial production, and also support the appeal of energy saving and environmental protection in modern society.

WHAT'S THE APPLICATION OF METAL DEEP DRAWING?

Products made by deep drawing are very diverse, from metal parts with diameter of less than 1cm to aircraft parts, automobiles and large equipment. Deep drawing is also widely used in household products such as cans, battery boxes, fire extinguishers and sinks.