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Cold Upset Forging Process Is A Kind Of Less Cutting Metal Pressure Processing Technology

Anebon Metal Products Co.,Ltd | Updated: Oct 16, 2018

Introduction to cold upsetting process 2:Cold upset forging process is a kind of less cutting metal pressure processing technology

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Third, the fastener processing process Brief description of the fasteners are mainly divided into two major manure: one is threaded fasteners; the other is non-threaded fasteners or couplings. This is only a brief description of threaded fasteners.

1. Thread fastener processing process is generally composed of cutting, cold rolling, or cold extrusion, cutting, thread processing, heat treatment, surface treatment and other production processes. The material reforming process is generally: pickling, drawing, annealing, phosphating saponification, drawing, and spheroidizing (spheroidizing phosphating). The cold-added process of thread-type fasteners has the following conditions: Thread fasteners below 8.8 Product processing flow head → cleaning → 搓 thread → cleaning → surface treatment → packaging threaded fasteners below 8.8 grade product processing flow head → cleaning → cutting → heat treatment → threading 搓 thread → cleaning → surface treatment → packaging 8.8-10.9 Threaded fastener product processing process head → cleaning → cutting → 搓 thread → heat treatment → cleaning → surface treatment → packaging 10.9-12.9 thread fasteners product processing flow head → cleaning → heat treatment → cutting → rolling thread → cleaning → non-destructive testing →Cleaning→Surface Treatment→Packaging

2. Threaded fasteners commonly used materials Thread fasteners commonly used materials as shown in Table 1 (including domestic and foreign materials comparison)

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Fourth, the basic method of cold forging process design Cold upset process design is actually the design of cold heading mold, each process plan we design is ultimately achieved through mold design. Cold upset forging process design: Firstly, the length of the blank is calculated according to the specific parameters of the product. The weight calculated at this time is actually the net weight of the part. The length of the blank during cold upsetting can be determined according to the principle of volume change, that is, the plastic deformation blank The volume is equal to the volume of the part after plastic deformation. If cutting is to be carried out, the volume of the blank should also be increased by the corresponding amount of cutting. The weight calculated after adding the corresponding cutting allowance is actually the gross weight of the part. Secondly, the degree of deformation and the number of upsets are determined. As shown in the figure, when the aspect ratio ≤ 2.5, the upset is once: when 2.5 ≤ the aspect ratio ≤ 4.5, the upset is twice: when 4.5 ≤ the aspect ratio ≤ 6.5, the upset is three times. The above data can be realized under ideal conditions. In actual production, the geometry of the product should also be taken into account, and in order to ensure the quality, the upset deformation should be increased according to the above data. Third, determine the processing strategy. According to the specific requirements of the product, it is determined whether the product adopts a non-cutting process or a small-cutting process and which production equipment is used, and the processing step is designed to determine the processing plan. Fourth, the blank diameter of all materials is determined based on the above three factors. It should be noted that the size of the raw material and the size of the product head, the size of the rod of the product, the production equipment, and the precision of the thread and the surface treatment are all closely related to the fastener. For example, the GB5786-M8 hex head bolt is taken as an example to illustrate. It is more clearly and intuitively expressed in the form of a table. See Table 2 for details. Fifth, calculate the net weight of the part according to the relevant parameters of the product, and calculate the part consumption quota according to different processing methods and methods. Sixth, according to the product requirements, the diameter of the rolling screw blank is determined. The diameter of the rolling screw blank required by different thread standards is different. In the national new thread standard GB192-81-GB2516-M8, the external thread mainly has four types: 6e, 6f, 6g and 6h. Seventh, cold forging processing technology and mold design The following is a hex head bolt cutting process step: K = head height k, = head wrench height cutting → pre-forming → final 剪切 → shear hex → (搓 搓) Figure 3 hex head bolt no cutting process step diagram: trimming → pre-forming → shaping → 镦 hexagon → (搓 thread) 1. Feed roller design The size and aperture size of the feed wheel is cold upset Determined by the equipment manufacturer, no need to redesign. We only need to design the working groove size of the feed wheel. The groove size depends on the maximum diameter of the raw material wire. The tolerance is H110-H11.

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2. The diameter of the cutting edge is generally the largest diameter of the raw material, and the tolerance is H9-H10.

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3. The diameter of the cutting die is generally the diameter of the raw material: the maximum size + (0.05-0.10), and the tolerance is H9-H10.

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4. The design principle of the pre-formed die design is to require a punch to have the largest possible deformation ratio, to prepare for the second upset forming, and secondly to avoid the longitudinal bending of the metal fibers. There are many methods for designing a die, and there are currently two typical methods. One method is represented by the United States: this method is based on the theory of plastic deformation nucleation, first determining the diameter of the big end of the cone Dk, and then determining the size of a punch cavity. According to the theory of plastic deformation nuclei, it is assumed that the diameter Dk of the large end of the cone is 1.4 times the diameter dm of the small end, and the angle α of the cone angle is positioned at 12°, and the portion of the metal volume is insufficient, which is supplemented by the adjustment of the h portion of the cylinder. The design method of dm = line diameter in the circle is not completely constant, it varies with the hardness of the material. In this way, the cone angle α value is only for the bolt, and for other head shapes, the alpha value varies. Another method is represented by the Soviet Union. This method is to select the alpha angle from the aspect ratio and then determine the other dimensions. The aspect ratio determines the size of the alpha angle. Dm = wire diameter 5. Final forging die and main die design The die design is relatively simple, and the design principle is based on the shape and size of the processed product head. If cutting is required, the corresponding machining allowance should be considered. D0=(1.04-1.1)emax, where emax is the maximum diagonal dimension of the hexagonal head bolt D=(0.9-0.95)S, where S is the hexagonal head bolt opposite side dimension H=bolt head height, h=2H /3, where h is the cavity depth of the mold. The main mode is mainly designed according to the processing requirements of each step part. Here, only the design method of the multi-layer prestressed main mold is described. Practice has proved that the multi-layer prestressed structure main mold is a more effective method to solve the radial cracking of the main mold. It is especially effective for the pre-stress combined main mold with cemented carbide as the core. The number of layers of pre-stressed structural layers is determined primarily by the size of the unit pressure during the cold upset process, the size of the cavity and the strength of the material used. There are two cases here: in one case, the main mold core is allowed to work under tensile stress, that is, it is made of high-strength mold steel, and then determined according to the internal pressure Pimax: when Pimax ≤ kg/mm2, it is When 110kg/mm2≤Pimax≤160kg/mm2, a layer of prestressed sleeve is used; when 160kg/mm2≤Pimax≤200kg/mm2, two layers of prestressed sleeve are used; the pressure in the main mould is generally calculated according to the unit pressure of the die. In another case, the main mold core is not allowed to work under tensile stress. The main mold made of cemented carbide (commonly known as tungsten steel) belongs to this type. At this time, it is selected according to the following Pimax: when Pimax≤110kg When using /mm2, use a layer of prestressed sleeve; when 110kg/mm2≤Pimax≤190kg/mm2, use two layers of prestressed sleeve; the ratio of the diameter of the outer ring of the prestressed sleeve to the diameter of the inner cavity of the main mold can be 4-6 . If there is an intermediate prestressed sleeve, the relevant dimensions can be calculated from the relevant cold extrusion data.


Anebon Metal Products Co.,Ltd

Skype: jsaonzeng

Mobile: +86-13509836707

Tel: +86-769-89802722

E-mail: info@anebon.com

URL: www.anebon.com