CN109092982A - A method of forming metal alloy parts - Google Patents

Abstract

The invention discloses a kind of methods for forming metal alloy parts, it include: the solution heat treatment temperature that metal alloy slab is heated to at least its heating station, the sheet material blank of heating is transmitted to press, component is initially formed by closing pressing mold with First Speed, then forming is completed by closing pressing mold with second speed, and second speed is slower than First Speed, keeps molded component in a mold during the component being cooled into.A kind of method of formation metal alloy parts of the invention, can improve the environmental performance of automobile.

Description

A method of forming metal alloy parts

Technical field

The present invention relates to using known technology to be difficult to be formed the forming method of the molded component of complicated shape, in particular to one The method that kind forms metal alloy parts.

Background technique

In order to improve the environmental performance of automobile, vehicle is mobile towards the light alloy for forming component, traditionally, is closing There are comparable tradeoffs between the intensity of gold and the formability of alloy.However, such asIt is had allowed for etc. new forming technique More complicated component is formed from the high-intensitive light-alloy trade mark such as 2xxx, 5xxx, 6xxx and 7xxx series alloys, age-hardening Aluminium alloy panels usually (solution heat treatment and quenching) cold forming under the conditions of T4, it is higher strong to obtain to be followed by artificial aging Degree, or under the conditions of T6 (solution heat treatment, quenching and artificial aging).Both of which introduces some intrinsic problems, Such as rebound and low formation, this is insoluble.Formability can be improved in drop stamping, reduces rebound, but destroy ideal group It knits.Therefore, rear shaped solution heat treatment (St) needs to restore microstructure, but this leads to the group formed after quenching after quenching The deformation divided also encounters these disadvantages when forming engineering part using other materials.In order to overcome these disadvantages, carry out Various effort, and invented special process and to form the specific question of specific types of components to overcome, as one kind Technology utilizes solution heat treatment, forming and cold die quenchingAs the present inventor applies WO2008/059242 in its early stage Described in.In this process, aluminum alloy blank is after heat treatment quickly transferred on one group of cold mould, and cold mould is closed immediately To form molded component, it is formed by component and is maintained in cold mould when cooling is formed by component.Technology it is further Development is related to extremely fast mold closure if the present inventor is described in EP2424137, this allows to produce high quality Part.However, the mold that this high speed is closed be unable to reach with traditional press machine, and need special tool production or Significant upgrading, this considerably increases setup costs.During described in the EP2424137, hot pressing may require rushing for press machine Cheng Sudu is greater than 100 mm/seconds, and in order to realize the component with optimum performance, it may be necessary to which 400 mm/seconds are bigger Press machine speed.More conventional press machine is run with slower speed, for example, they are typically below 50 mm/seconds Maximum power stroke speed.

Technical solution

The invention mainly solves the technical problem of providing a kind of methods for forming metal alloy parts, which is characterized in that It include: that metal alloy film base is heated at least its solution heat treatment temperature at warm table；The sheet material blank of heating is transmitted To press；Component is initially formed by closing pressing mold with First Speed, then completes forming by closing pressing mold with second speed, The second speed is slower than First Speed；The component of forming is kept in a mold with the component cooling period in formation.

Optionally, wherein including using press machine by closing die of press with First Speed come the formation of activation member Unpowered or low dynamics, high speed stroke.

Optionally, wherein First Speed include press machine fast approaching mode, wherein First Speed be at least 100 milli Meter per second.

Optionally, wherein including being rushed using the power of press machine by closing die of press to complete forming with second speed Journey.

The beneficial effects of the present invention are:

A kind of method of formation metal alloy parts of the invention, can improve the environmental performance of automobile.

Detailed description of the invention

Fig. 1 is shown according to routineThe figure of the operative configuration file of process.

Fig. 2 is figure according to the present invention, shows new operation profile.

Fig. 3 is the curve graph for showing the Temperature Distribution of metal parts in entire forming process.

Embodiment

The preferred embodiments of the present invention will be described in detail below so that advantages and features of the invention can be easier to by It will be appreciated by those skilled in the art that so as to make a clearer definition of the protection scope of the present invention.

As shown in Figure 1-3, in the A stage, hydraulic press is fully opened, mold separation, so that sheet metal blank load and unloading Into press machine, once being packed into blank, forming process is begun to.In stepb, mould is closed using hydraulic rapid decrease feature Tool, to minimize the time quantum that sheet material blank leaves heating station before compression.During dropping Mode B at the fast speed, mold is fast Speed, which is closed, to be contacted until them almost or with sheet metal blank.Typically, at the fast speed under drop mode, mold is under the effect of gravity It falls, rather than is driven by hydraulic, pneumatic or similar system.Once completing rapid decrease, mold is contacted with sheet stock or phase Neighbour, then hydraulic system engages, and press is operated with quick pressing mode.In this example, with roughly the same with rapid decrease mode Speed execute quickly compacting mode, and maintained until mold is closed completely and forming member.Ideally, start at Quickly compacting mode is engaged before shape component, to provide smooth and continuous pressure on sheet material blank.At this point, mould Tool remains closed, and component quenches between cold or cold mold, once complete quenching Step, so that it may mold is opened, and according to need Removing component is wanted to be further processed.

Modified face of the invention as shown in Figure 2, the initial stage is same as the prior art, and mold is fully opened to load Sheet metal blank loads pre- solution heat treatment blank, and uses rapid decrease mode.However, in contrast to the prior art, when mold connects When touching or neighbouring slab, rapid decrease mode is without departing from the contrary, rapid decrease mode continues and is used to form the initial of component Stage.Due to the lower resistance and improved ductility of the blank of metal plate of solution heat treatment, the low-power foot of rapid decrease mode Most of forming step is formed and implemented with starting.Once reaching predeterminated level, rapid decrease mode terminates 2, and hydraulic pressure system System engagement is with the operating pressure machine in standard form mode 3.In standard form mode 3, it can be formed with high quality level Molded component fine detail and sharpened edge, final stage is same as the prior art, and component is maintained between Guan Bi mould Until quenching, once quenching, mold can be opened, and component further can be removed and be processed, such as pass through aging. Due to any delay of power stroke, exists usually between the first and second modes and pause, although this is to function of the invention It is not important, the press machine for not having quickly compacting mode can be used to this modification of forming process and carry out, therefore, the mistake Existing equipment progress can be used in journey, ressembles or completely new system without expensive, even if one of the technique Point with slow forming speed progress, it is also possible to using only high-speed blanking press will likely complex component formed high standard.

Such as Fig. 3, the process is schematically outlined, first by blank heating to its temperature 11 (such as the 525 of AA6072 DEG C), the period (such as 30 minutes of AA6072) needed for then retaining the material at this temperature, then sheet blank is stood It is transferred on press machine and is placed in lower die 13.This transfer should be sufficiently fast, to ensure from aluminium blank to ambient enviroment Minimum heat loss (being, for example, less than 5 seconds).Then shaping stage 14 occurs as described above and referring to Fig. 2, by at least 100 millis The First Speed of meter per second closes die of press to start the formation of component, by the way that mold is closed into the absolute bottom of press machine First position in about 10 millimeters of position keeps First Speed until completing the major part of forming.Formation is to pass through Close what pressing mold was completed with second speed, by the speed with about 50 mm/seconds remain to absolute bottom position it is remaining away from From, of short duration pause is needed during starting stratum and completing stratum, is then maintained in its closed position press machine, molding Component quenches 15 until component is cooled to 200 DEG C or less between mold.Once being fully cooled, which can be removed and be subjected to Then natural aging 16 carries out artificial ageing 17 to improve intensity 9 hours of finished product component, if necessary to carry out to formed product Subsequent spraying, then can be by aging in conjunction with baking process.

The sequencing of above embodiments is not only for ease of description, represent the advantages or disadvantages of the embodiments.

Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although Present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: it still may be used To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features； And these are modified or replaceed, technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution spirit and Range.

Claims (4)

1. a kind of method for forming metal alloy parts characterized by comprising heat metal alloy film base at warm table To at least its solution heat treatment temperature；The sheet material blank of heating is transmitted to press；Started by closing pressing mold with First Speed Then forming member completes forming by closing pressing mold with second speed, the second speed is slower than First Speed；With formed Component cooling period the component of forming is kept in a mold.

2. a kind of method for forming metal alloy parts according to claim 1, it is characterised in that: wherein by with first It includes unpowered or low dynamics, high speed stroke using press machine that speed, which closes die of press to carry out the formation of activation member,.

3. a kind of method for forming metal alloy parts according to claim 1, it is characterised in that: wherein First Speed packet The fast approaching mode of press machine is included, wherein First Speed is at least 100 mm/seconds.

4. a kind of method for forming metal alloy parts according to claim 3, it is characterised in that: wherein by with second It includes the power stroke using press machine that speed, which closes die of press and completes forming,.