50results about How to "Reduce forming pressure" patented technology

The invention provides a superplastic die forging forming device and method for amorphous alloy precision parts. The device is composed of a vacuum furnace (1), a replaceable pressure head and a mold. The replaceable indenter is made up of inner indenter (2), outer indenter (3), slide block (4), connecting seat (5), and mold is made up of mold (7), ejection mechanism (8). The process is to place the blank and the mold in a vacuum furnace, and when the vacuum degree reaches 8×10 -3 Pa, start heating, heating rate 0.5 ~ 3.0 ℃ / s; heating temperature should be between Tg ~ Tx; forming strain rate range of 1 × 10 -2 ~5×10 -4 the s -1 . The advantage is that it is suitable for the forming of bulk amorphous alloy materials with large supercooled regions such as Zr-based, La-based, and Pd-based. The dimensional accuracy of the prepared parts is between ±0.1% and ±0.3%, and the surface is rough. The degree Ra is less than 0.8μm, and it can even reach the nanoscale mirror surface.

A preshaping apparatus with internal high pressure for the hollow structure member, such as pipe, is composed of upper mould, lower mould, and press. Said upper mould is fixed to the pressing head of press. The different surfaces of said upper and lower moulds, a movable moulding block and a fixed moulding block can form the first, the second and the third moulding cavities. When said movable moulding block is driven by cylinder and said upper mould is driven by press, the sizes of moulding cavities are changing to form a pipe.

The invention relates to a bipolar plate forming technology, in particular to super-plastic forming device and process of a metal bipolar plate for a proton exchange membrane fuel cell. The device comprises a pressure plate, guide sleeves, springs, guide posts, a pressing rod, an environmental box, an upper template, a lower template, a base, a connection plate, a blank pressing plate, a metal plate and a support rod. The process implemented by the device comprises the following steps: (1) opening the environmental box; (2) fixing a metal sheet of a processed part on the lower template; (3) closing the environmental box, determining the super-plastic forming temperature according to a processed plate and inputting the super-plastic forming temperature into a control system; (4) setting the stroke and the movement rate of the upper template according to the super-plastic strain rate and flow channel shape of the processed plate; (5) starting a circuit system and the environmental box, starting a pressure forming machine to move downwards, and finishing stamping; (6) starting the upper template of a press to reversely return back to the initial position; and (7) opening the environmental box, and cooing and taking out a formed part. According to the super-plastic forming device and process, the material is effectively prevented from rebounding, and the forming accuracy and the dimensional accuracy are ensured.

The invention discloses a preparing method of a G10CrNi3Mo bearing steel large-scale special-shaped cross section annular blank. The preparing method comprises the steps that a G10CrNi3Mo alloy bar is heated to be 1210+ / -20 DEG C in a certain heating mode, and is then subjected to upsetting, punching and rolling to become a rectangular cross section annular blank; then, the rectangular cross section annular blank is expanded into a primary special-shaped cross section annular blank at the pressure of 23 to 26MN; next, the primary special-shaped cross section annular blank is expanded into a secondary special-shaped cross section annular blank at the pressure of 20 to 25MN; then, the upper end of the secondary special-shaped cross section annular blank higher than a loose tooling is subjected to free upsetting to be flush with the loose tooling at the pressure of 8 to 12MN, and the final special-shaped cross section annular blank is obtained. The method has the advantages that the forming pressure required by the blank manufacturing can be effectively reduced, meanwhile, the flow direction of process excess materials can be effectively controlled, and the forming dimension of an intermediate blank is ensured. The method is applicable to the preparation of the intermediate blank of a large-scale special-shaped cross section annular blank element.

A method and a device for upsetting capable of non-uniformly increasing the diameter of the unintended part of a material in the circumferential direction. The method comprises a step of preparing a guide (20) having an insertion hole (21) in which the unintended part (2) of the material (1) is inserted and held in a buckling prevented state. In the device, a projected part (22) for suppressing an increase in diameter projecting in the axial direction of the guide (20) is integrally formed at a part of the tip part (20a) of the guide (20). The method also comprises a step of holdingly inserting the intended part (2) of the material (1) fixed to a fixed die (10) into the insertion hole (21) of the guide (20) and, while axially pressurizing the intended part (2) of the material (1) with a punch (30) by moving the punch (30), moving the guide (20) in an opposite direction to the moving direction of the punch (30) to increase the diameter of the intended part (2) of the material (1) exposed between the tip part (20a) of the guide (20) and the fixed die (10) in the state of suppressing an increase in the diameter of the contact part of the intended part (2) with the projected piece part (22).

The invention relates to the field of metal forming, in particular to a high-uniformity short-process forming method for a large metal component. Firstly, a cast alloy cast ingot is subjected to superhigh temperature demolding; then soaking is conducted on the liquid core cast ingot, precise control of the liquid fraction of the core part of the cast ingot is achieved, axial upsetting and rollingare conducted on the cast ingot under a forging press, dendrite at the liquid core of the cast ingot is fully crushed and balled, and a uniform and tiny semisolid structure is formed; and finally radial and axial forging is conducted on the cast ingot, and the cast ingot is forged into the needed large metal component structure. Through the high-uniformity short-process forming method, the problems such as shrinkage cavity and porosity and dendritic segregation in the cast ingot are solved, the central mechanical performance of the large metal component can reach the surface performance level,and uniformity of the overall performance of the component is improved. The core part of the cast ingot forms the uniform and tiny semisolid structure, and thus the final forge piece has good comprehensive performance. Forming pressure is small, the requirement for ability of forging equipment is lowered, the technological process is shortened, and production cost can be lowered effectively.