CN102706767A

CN102706767A - Push-pull type multi-groove dual side box thermal stress prefabricated microcrack cooling equipment

Info

Publication number: CN102706767A
Application number: CN2012101842188A
Authority: CN
Inventors: 张立军; 马宏智
Original assignee: China University of Petroleum East China
Current assignee: China University of Petroleum East China
Priority date: 2012-05-29
Filing date: 2012-05-29
Publication date: 2012-10-03
Anticipated expiration: 2032-05-29
Also published as: CN102706767B

Abstract

The invention discloses push-pull type multi-groove dual side box thermal stress prefabricated microcrack cooling equipment, which belongs to the technical field of machinofacture and overcomes the defects of the conventional experiment equipment, including low protection degree of the V-shaped grooves for a bar, non-uniform cooling to the surface of the bar and difficulty in conveying the bar to the cooling equipment. By adopting a multi-groove movable side box, aiming to experiment bars with different diameters, two matchable semi-insertion pieces with different sizes can be utilized to effectively protect the V-shaped grooves, and meanwhile, the bar can be quickly conveyed to the cooling equipment and accurately leveled with the V-shaped grooves, so as to fully chill the bar. Owing to a plurality of water inlets respectively formed in four uniform positions in the circumferential and axial directions of the bar, the ring-shaped surface of the bar, which is not protected by an asbestos cushion, can be uniformly cooled in a short time. The cooling equipment has the advantages of simplicity in operation, high efficiency and reliability, and the like.

Description

The prefabricated micro-crack cooling device of plug-type multiple-grooved bilateral case thermal stress

One, technical field

The present invention relates to the experimental provision of the most advanced and sophisticated micro-crack of a kind of prefabricated bar V-type groove, belong to mechanical manufacturing field.

Two, background technology

The low stress precise blanking method all adopts the prefabricated bar V-type of method for turning groove earlier at present; Because turning wearing and tearing and life problems thereof; Cause the root fillet radius of V-type groove can not be too little, can not be too big thereby V-type groove point stresses is concentrated, cause blanking pressure still very big; And the ring-type V-type groove loading back formation used time of initial micro-crack to having big radius of corner has occupied more than 80% of blanking T.T., and then blanking efficient is low.Thereby proposed before blanking, at first to the experiment bar that has the annular V-shaped groove at the most advanced and sophisticated prefabricated micro-crack of its V-type groove, to shorten the germinating time of crackle as far as possible, improve blanking efficient.

Thermal stress precrack method is to utilize the principle of expanding with heat and contracting with cold of material; Make thermograde and in bar, produce thermal stress through diverse location place at bar; Near because the three-dimensional stress effect the V-type trench bottom; When plastic yield, will produce very big hot-drawn stress near the V-type trench bottom, after the strength degree of this hot-drawn stress, will near the V-type trench bottom, produce micro-crack by the intersection of elasto-plastic range (elasto-plastic region) above material under the corresponding temperature.In thermal stress precrack method, through earlier bar integral body being heated to high temperature, then with the V-type slot part of asbestos pad protection bar, and to the cooling fast of partly spraying water of the bar between the V-type groove, i.e. segmentation is cooled off simultaneously.In cooling procedure; All there is temperature difference because bar is inner with surface, V-type groove and the direct acting bar of current surface; This will cause strong thermal stress effect, because the effect of the three-dimensional stress at V-type groove tip, near the hot-drawn stress the bottom of V-type groove will be bigger.Surpass the strength degree of material under the corresponding temperature when this hot-drawn stress after, will near the V-type trench bottom, produce micro-crack by the intersection of elasto-plastic range (elasto-plastic region).

Through the experiment of repeatedly thermal stress precrack, find that the current experiments device exists that bar V-type groove place is poor by degree of protection, the bar surface cool uneven, bar is sent into shortcomings such as cooling device difficulty.The main cause that causes above-mentioned deficiency occurring is; In existing cooling device, each independently inserted sheet be one owing to should guarantee that bar V-type slot part is by the closely knit protection of asbestos pad; Guaranteeing to make hot bar to send into along each inserting-plate hole fast again puts in place; Difficulty very just when bar is sent into cooling device like this, and have only a water inlet that chilled water is injected in the upper surface of bar, so the most advanced and sophisticated crackle effect of the prefabricated V-type groove of thermal stress is not fine; Particularly to some plastic metal material, effect is more not obvious.

In sum, the present invention proposes a kind of new prefabricated micro-crack cooling device of plug-type multiple-grooved bilateral case thermal stress, and accomplished designing and developing of its machine structural parts.

Three, summary of the invention

In order to realize the effectively cooling fast of bar, the present invention has designed a kind of thermal stress precrack cooling device.This device is simple to operate, efficient is high, reliability.Its critical piece comprises upper end cover, fixation side case, has the active side case of drawing handle, inserted sheet, asbestos pad, water inlet pipe support, dividing plate and tank etc.

The technical solution adopted for the present invention to solve the technical problems is: adopt the movable side case of multi-groove type that has drawing handle; Experiment bar to different-diameter; Utilize the two halves of different geometrical size can join effectively protection bar V-type slot part of inserted sheet; Bar can be sent into cooling device rapidly and can aim at the V-type groove exactly simultaneously, and then realizes the abundant Quench of bar.Be employed on the bar circumference and axially last 4 be uniformly distributed with the position many row's water inlets be set respectively, do not make and cooled off in the short period of time evenly by the long bar annular surface of asbestos pad protection.Force cooling fast in order the bar with different V-type separation to be carried out segmentation, adopt the form of inserted sheet to come spacing, promptly on the inwall of the left and right sides of cooling body, process many group slots separated by a distance.Inserted sheet is connected to form by circular clamping plate, rectangle plate, asbestos pad etc.During cooling according to the position of the position of V-type groove on bar adjustment inserted sheet, to reach not by the best cooling effect of the long bar annular surface of asbestos pad protection.The inserted sheet separated into two parts, wherein one is semifixed, and half moves with the active side case.After bar is sent into cooling device, after confirming each V-type groove and corresponding asbestos pad being aimed at, the active side case is closed, the cold water that gets into certain pressure and flow from water inlet is to the cooling of spraying water of bar surface.If the bar diameter changes, can replace the inserted sheet of different geometrical size.Water inlet place is provided with the water inlet pipe bracing or strutting arrangement that links to each other with water inlet pipe, and the water of four water delivering orifice outflows finally gets into tank.

The invention has the beneficial effects as follows that bar can be sent into cooling device rapidly and accurately, the V-type groove can effectively be protected, and four different directions are realized abundant water-cooled to the bar surface sprinkling, and bar V-type separation is adjustable, and are simple to operate.

Four, description of drawings

Fig. 1 is an inner structure synoptic diagram of the present invention.

Fig. 2 is the one-piece construction synoptic diagram.

Fig. 3 is the inserted sheet synoptic diagram.

Below in conjunction with accompanying drawing and instance the present invention is further specified.

Five, embodiment

In Fig. 1; After the bar (1) of certain physical dimension is put into this cooling device; This moment aligns with corresponding inserted sheet (11) just in bar V-type groove position, the active side of closing afterwards case (2), and chilled water sprays from four different directions entering cooling devices and to the bar surface fast.All be provided with the corresponding dividing plate of similar dividing plate (6) structure on upper end cover (10) bottom, active side case (2) inboard, fixation side case (8) inboard, the tank (3).Auger shell pit (5) on the dividing plate.Slot (9) is all arranged on the dividing plate of active side case and fixation side case.Also be provided with drawing handle on the active side case.The tank lower end sets out the mouth of a river (4).

In Fig. 2; On upper end cover, fixation side case, active side case and head side plate (7), be respectively equipped with four water inlet pipes (13); The water inlet pipe interface that wherein joins with the active side case is wedge shape mouth (14), and dock with its interface just the active side case back of closing, and the end of interface adds rubber ring and guarantees to seal.Four water inlets are supported (12) through a water inlet pipe be integrated into a total water inlet.

In Fig. 3; Force cooling fast and effectively protect the V-type slot part in order the bar with different V-type separation to be carried out segmentation; And bar is sent into easily; Adopt the form of inserted sheet to regulate the V-type separation, promptly on the inboard partition of active side case and fixation side case, process many group slots (9).Inserted sheet is connected to form through bolt (15), nut (19) by circular clamping plate (16), rectangle plate (17), asbestos pad (18), during cooling according to the position of the corresponding adjusting inserted sheet in position of V-type groove on the bar, to reach best cooling effect.Inserted sheet in two, wherein one is semifixed, half the with the motion of active side case, can fast bar be sent into cooling device like this.

Claims

1. one kind based on the cooling device of stress concentration effect with the most advanced and sophisticated micro-crack of the prefabricated bar V-type of the thermal stress groove of the effect of expanding with heat and contract with cold.Adopt plug-type multiple-grooved bilateral case; Annular four sides water spray is the cooling bar fast; It is characterized in that: adopt the movable side case of multi-groove type that has drawing handle,, utilize the two halves of different geometrical size can join effectively protection bar V-type slot part of slot to the experiment bar of different-diameter; Bar can be sent into cooling device rapidly and can aim at the V-type groove exactly simultaneously, and then realizes the abundant Quench of bar.Be employed on the bar circumference and axially last 4 be uniformly distributed with the position many row's water inlets be set respectively, do not make and cooled off in the short period of time evenly by the long bar annular surface of asbestos pad protection.

2. cooling device according to claim 1 is characterized in that: one of which side case is the fixation side case, and the opposite side case is the plug-type active side case that has drawing handle.Owing on the case of both sides water inlet is arranged all; Also all need match with the corresponding waterpipe jointing on water inlet pipe supports; So the water inlet of active side case is arranged to wedge shape; Water inlet pipe support with matching is gone up corresponding waterpipe jointing and also is arranged to wedge shape, guarantees that the active side case does not interfere with it in the push-and-pull process.Go up corresponding waterpipe jointing when closing when active side case and water inlet pipe support, have rubber ring to cooperate between the two, to guarantee sealing.

3. cooling device according to claim 1; It is characterized in that: on a plurality of directions, sprayed water fast in the bar surface simultaneously in order to make the cooling device water jet; A water inlet pipe is set to be supported; Make whole cooling device have only one with the outside water inlet that connects, more convenient to operate, also make the cooling of bar peripheral surface more even.

4. cooling device according to claim 1 is characterized in that: each inserted sheet at protection bar V-type groove place all is made up of the two halves of symmetry, and in the time of like this before the two halves inserted sheet is involutory, bar is easy to send into cooling device; After the two halves inserted sheet is involutory, asbestos pad can with bar paste very closely knit, and then obviously being strengthened of bar V-type groove place by the protection effect.