CN2841179Y

CN2841179Y - Force-reducing device for internal high pressure formation

Info

Publication number: CN2841179Y
Application number: CNU2005200230391U
Authority: CN
Inventors: 郎利辉; 周贤宾
Original assignee: Beihang University
Current assignee: Beihang University
Priority date: 2005-06-21
Filing date: 2005-06-21
Publication date: 2006-11-29
Anticipated expiration: 2015-06-21

Abstract

The utility model relates to a force reducing device for internal high pressure formation, which comprises two male dies. The utility model is characterized in that the axially feeding male die in the two male dies is provided with a force reducing shaft body which is used for reducing liquid pressure bearing area of the male die and is inserted into the middle part of the other male die when the two male dies move in opposite directions. Junctions between the force reducing shaft body and the two male dies are respectively additionally provided with corresponding sealing devices, wherein the force reducing body in the shape of a constant section body or a non-constant section body has a circular or non-circular cross section, and a smooth blend head section. The utility model comprises the force reducing shaft body between axial feed devices on both ends of a pipe or a profile, and the force reducing shaft body can cancel out opposite acting force on the axial feed devices because of internal pressure, so as to fundamentally solve the technical problem of overlarge axial force when inner pressure is used for forming various large hollow parts, so the utility model can be used in high-pressure formation for various hollow structural components.

Description

A kind of force-reducing device that is used for internal high pressure forming

Technical field

The utility model relates to a kind of force-reducing device when inner high voltage liquid shaping hollow part, and the force-reducing device when particularly adopting tubing and section bar to be shaped various hollow part as blank belongs to tubing and section bar forming technique field.

Background technology

In fields such as Aero-Space and automobiles, weight reduction is people's long-term aim with economical with materials and operating energy, also is one of trend of modern advanced manufacturing technique development.Under the situation that current automobile competition in the international market is growing more intense, the various countries automaker adopts the 3R strategy to deal with challenge one after another, i.e. three minimizings (Reduction): reduce the time that comes into the market, reduce development cost and reduce weight, and loss of weight is present focus with fuel savings.Know that by mechanics principle for the member that bears crooked and torsional load, the employing hollow-core construction both can weight reduction, economical with materials, can make full use of the strength and stiffness of material again.This trend is not limited to auto manufacturing, has wide significance.The hollow part conventional fabrication processes adopts the method for welding after the punching press mostly, but shortcomings such as the punching press weldment exists that solder joint is many, poor fatigue properties, many, the follow-up amount of machining of operation are big and the process-cycle is long.So interior high forming technique has been subjected to general attention.But when utilizing this technology molding large annular hollow part, because internal pressure is very big, so the opposition that produces is huge, the thrust of thruster motion device needs hundreds of at least tons, goes up kiloton at most, and is bulky, energy loss is also big, utilizes traditional device to produce difficulty.According to the internal high pressure forming principle as can be known, lateral thruster front end center area there is no effect for shaping, but because the effect of internal pressure has produced very big reaction force, makes side-thrust increase, and makes useless energy consumption too much.

The utility model content

The purpose of this utility model is: a kind of force-reducing device that can be applied in the internal high pressure forming is provided, solve the too much not enough problem of excessive, the useless energy consumption of thruster motion device thrust in the existing internal high pressure forming, this device adds a device that is used to reduce the area that lateral thruster contacts with the liquid of generation pressure in the middle of the shaping hollow part, thereby has reduced side-thrust.

Technical solution of the present utility model: a kind of force-reducing device that is used for internal high pressure forming, comprise two punch, it is characterized in that: on the punch of feeding vertically between two punch, be equipped with one be used for reducing punch liquid body pressure area subtract the mechanical axis body, and the middle part of when two punch move toward one another, inserting another punch, subtract the mechanical axis body and two punch junctions are added with corresponding sealing device and sealing device respectively at this, the cross section that wherein subtracts the power body is for circular, or it is non-circular, it is shaped as the uiform section body, or interface body such as non-, its head is a rounding off.

The utility model major advantage compared with prior art is: contain one in the two end axles of tubing or section bar in the middle of feed arrangement and subtract the mechanical axis body, this root subtracts the mechanical axis body can offset the opposition for the axial feed device that produces owing to internal pressure, presses the excessive technical problem of axial force when being shaped various large-scale hollow part in fundamentally solve utilizing.

Description of drawings

Fig. 1 is a structural representation of the present utility model;

Fig. 2 is the schematic diagram of the utility model behind forming tubular product.

The specific embodiment

As shown in Figure 1, 2, on the right punch 4 of feeding vertically between right punch 4 and the left punch 5, be equipped with one be used for reducing punch liquid body pressure area subtract mechanical axis body 3, and the middle part of when two punch move toward one another, inserting left punch 5, subtracting mechanical axis body 3 and two punch junctions are added with corresponding sealing device 6 and sealing device 7 respectively, wherein sealing device 6 is movable sealing, and sealing device 7 is a static seal.The cross section that subtracts mechanical axis body 3 can be circular or non-circular, and its shape can be uiform section body or the non-interface body that waits, its head 11 palpus rounding ofves, and subtract mechanical axis body 3 and can freely realize and being connected and separating of right punch 4, left punch 5.Subtract mechanical axis body 3 and adopt with right punch 4 and fixedly connected, connected mode can be to be threaded or mode such as welding.In forming process, subtract mechanical axis body 3 and do not separate with right punch 4; Subtract mechanical axis body 3 and adopt dynamic seal (packing) with left punch 5, subtracting mechanical axis body 3 before the shaping is what to separate with left punch 5, after blank is put die cavity into, the internal high pressure forming machine is exerted pressure fd to patrix 1, thereby make patrix 1 and counterdie 8 matched moulds form die cavity 9, right then punch 4 drives subtract mechanical axis body 3 and travel forward, and subtract mechanical axis body 3 front ends and extend in the left punch 5, and 6 cooperate with sealing, charge into hydraulic oil in the blank with sealing; Be shaped after the end, right punch 4 drives subtract mechanical axis body 3 moves backward, subtracts sealing 6 disengagings in mechanical axis body 3 front ends and the left punch 5, returns to initial state, and patrix 1 is opened, and the part after the shaping can take out from die cavity; Subtract mechanical axis body 3 and can adopt metal such as steel, aluminium alloy etc., or some are nonmetal as pottery etc.

The utility model is at first put into counterdie 8 with blank 2 before shaping, the internal high pressure forming machine is exerted pressure fd to patrix 1, thereby makes patrix 1 and counterdie 8 matched moulds form die cavity 9.During shaping, right punch 4 and left punch 5 move to blank 2 places under the effect of side-thrust f1 and f2, owing in the punch sealing device 6 and sealing device 7 are arranged on two, right punch 4 middle parts are equipped with and subtract mechanical axis body 3, when two punch run to Working position, subtract the middle part that the head of mechanical axis body 3 inserts left punch 5, the bight 11 that subtracts the head of mechanical axis body 3 must be handled by rounding ofves, in order to avoid damage sealing device 6; At this moment pressure generation device A is injected with the liquid of pressure by hole 12 to blank, and right punch 4 and left punch 5 axially advance under the effect of power simultaneously, and axial seal and axial thrust are provided.In the processing, highly pressurised liquid is applied to two active forces in the punch and only acts on annulus area 13 and the annulus area 14, and the gas in the left punch 5 in the seal chamber 10 can be overflowed by passage 15.

Claims

1, a kind of force-reducing device that is used for internal high pressure forming, comprise two punch (4,5), it is characterized in that: on the punch (4) of feeding vertically between two punch, be equipped with one be used for reducing punch liquid body pressure area subtract mechanical axis body (3), and the middle part of when two punch move toward one another, inserting another punch, be added with corresponding sealing device (6) and sealing device (7) respectively subtracting mechanical axis body (3) and two punch junctions.

2, the force-reducing device that is used for internal high pressure forming according to claim 1 is characterized in that: described is to subtract the cross section of mechanical axis body (3) for circular, or non-circular, and it is shaped as the uiform section body, or the non-constant section body, and its head (11) is a rounding off.