CN107552700B - An a kind of upsetting formation method of the big specification slab of larger ratio of height to diameter - Google Patents

An a kind of upsetting formation method of the big specification slab of larger ratio of height to diameter Download PDF

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Publication number
CN107552700B
CN107552700B CN201710858743.6A CN201710858743A CN107552700B CN 107552700 B CN107552700 B CN 107552700B CN 201710858743 A CN201710858743 A CN 201710858743A CN 107552700 B CN107552700 B CN 107552700B
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CN
China
Prior art keywords
cavity die
blank
jumping
pin
punch
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CN201710858743.6A
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Chinese (zh)
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CN107552700A (en
Inventor
于建民
张治民
王强
赵憙
孟模
程眉
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中北大学
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Abstract

The invention discloses an a kind of upsetting formation methods of the big specification slab of larger ratio of height to diameter, it is characterised in that: it is comprised the following steps: (1), bar material baiting;(2), homogenization heat treatment;(3), cylindrical blank is heated to forming temperature and kept the temperature, and upsetting formation mold is integrally preheating to cylindrical blank temperature or more and is kept the temperature, the upsetting formation mold it include punch-pin, upper cavity die, lower cavity die, cylindrical mandril;Upper cavity die is located at the lower section of punch-pin;Lower cavity die is located at the lower section of upper cavity die, the intracavitary diameter d of the type of lower cavity die2Diameter d intracavitary greater than the type of upper cavity die1, the high h of type chamber of lower cavity die2, the total high h of the type chamber of the type chamber of upper cavity die and lower cavity die1, wherein h1/d1=n (n > 3), jumping-up condition needs to meet(4), by the cylindrical blank by homogenization heat treatment, to be put into upper cavity die, recessed model intracavitary;(5), jumping-up;(6), jumping-up part is taken out.The present invention effectively avoids " Double drum type " and folds, and realizes the large plastometric set of big specification casting rod.

Description

An a kind of upsetting formation method of the big specification slab of larger ratio of height to diameter

Technical field

The present invention relates to metallic extrusion molding technical fields, and in particular to an a kind of upsetting of the big specification slab of larger ratio of height to diameter Dumming method.

Background technique

Upsetting process is the process of an inhomogeneous deformation.When cylindrical blank jumping-up, general ratio of height to diameter is limited in Less than or equal to 2.5.As ratio of height to diameter (2 < H/D < 3), workpiece side surface is easy that Double drum type is presented.Especially when pass deformation compared with When small and contact friction is larger, deformation is difficult deeply and adhesioin zone volume increases.At this moment, deformation is distributed very uneven, plasticity Deformation only height to outer layer occur;After H/D ratio is more than 3, it is also possible to the buckling of workpiece be caused to generate because of unstability The defects of folding, so that subsequent handling cannot carry out.Especially when blank end face is uneven or with blank axis out of plumb or blank Temperature and performance is uneven or template top and bottom are not parallel everywhere can all make blank generate buckling, if be not corrected Continue to forge, just will form folding.Folding is a kind of troubles, it not only reduces the loaded area of part, and when working this Place generates stress and concentrates, and usually becomes tired source.Therefore, it is generally not allow for folding on regulation forging in technical conditions.

Summary of the invention

In view of the defects and deficiencies of the prior art, the present invention intends to provide a kind of simple structure and reasonable design, make With a upsetting formation method of the big specification slab of convenient larger ratio of height to diameter, when ratio of height to diameter is greater than 3 cylindrical blank jumping-up, It is possible to prevente effectively from " Double drum type " and folding, realize the large plastometric set of big specification casting rod.

To achieve the above object, the technical solution adopted by the present invention is that:

An a kind of upsetting formation method of the big specification slab of larger ratio of height to diameter, it is comprised the following steps:

(1), bar material baiting;

(2), homogenization heat treatment;

(3), cylindrical blank is heated to forming temperature and kept the temperature, and upsetting formation mold is integrally preheating to cylindrical body More than blank temperature and keep the temperature, the upsetting formation mold it include punch-pin, upper cavity die, lower cavity die, cylindrical mandril;It is described Punch-pin be fixedly connected by cope plate with the top shoe of press machine;Upper cavity die is located at the lower section of punch-pin;Lower cavity die is located at fovea superior The lower section of mould, and be fixedly connected by fastener or pin shaft with upper cavity die, the intracavitary diameter d of the type of the lower cavity die2Greater than fovea superior The intracavitary diameter d of the type of mould1, the high h of type chamber of lower cavity die2, the total high h of the type chamber of the type chamber of upper cavity die and lower cavity die1, wherein h1/d1=n (n > 3), jumping-up condition needs to meet

(4), the mold after preheating insulation is mounted on press machine;It is organic to punch-pin, upper cavity die, lower cavity die even application Graphitic lubricant;It is intracavitary by upper cavity die, recessed model is put by the cylindrical blank of homogenization heat treatment;

(5), press machine drives punch-pin to move downward, and the upper blank of cylindrical blank is limited in when jumping-up is initial In upper cavity die, when starting jumping-up, the part is indeformable, and the extruding force that punch-pin applies only is passed to lower part base by the part Material, and the ratio of height to diameter of the unrestricted blank in lower part is less than 3, so being not in unstability, even if since blank end face injustice causes Unstability slightly, in upsetting process, the cydariform of cylindrical blank can contact the inner wall of lower cavity die first, obtain cylindrical blank To school shape, guarantee the progress of upsetting process;And the initial confined metal in the top of cylindrical blank, in upsetting process, with The continuous jumping-up of lower part blank, progress into the unrestricted lower cavity die in lower part, realize jumping-up, be finally upset as required jumping-up Part;

(6), press ram drives punch-pin to move upwards;Press machine liftout tank moves upwards, make, cylindrical mandril it is upward The bottom of jumping-up part, is risen to the outlet end of upper cavity die, then taken out by movement;Punch-pin and upper cavity die, lower cavity die are molded, it will The fastening bolt being connected with press ram and lower table is unscrewed, and mold is uninstalled.

After adopting the above scheme, the invention has the following beneficial effects: a kind of larger ratio of height to diameter of the present invention big specification slab Upsetting formation mold and method, by ratio of height to diameter, greater than 3 cylindrical blank, at the deformation moment, actual ratio of height to diameter control exists H/D < 2.5 effectively avoids " Double drum type " and folds, realizes the large plastometric set of big specification casting rod.

Detailed description of the invention

In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this Some embodiments of invention without any creative labor, may be used also for those of ordinary skill in the art To obtain other drawings based on these drawings.

Fig. 1 is structural schematic diagram of the invention;

Fig. 2 is working state schematic representation when cylindrical blank being put into mold before jumping-up in the embodiment of the present invention;

Fig. 3 is only lower part blank deformation stage mold work state when cylindrical blank starts jumping-up in the embodiment of the present invention Schematic diagram;

Fig. 4 is that cylindrical blank upsetting process middle and upper part blank progresses into lower cavity die deformation stage in the embodiment of the present invention Mold work status diagram;

Fig. 5 be in the embodiment of the present invention cylindrical blank in jumping-up end shaping stage mold work status diagram.

Fig. 6 is the principle of the present invention figure.

Description of symbols:

1, punch-pin;2, upper cavity die;3, lower cavity die;4, fastener;5, bottom plate;6, lower template;7, upper jacking block;8, lower top Block;9, cylindrical mandril;9-1, stair-step;10, cylindrical blank.

Specific embodiment

With reference to the accompanying drawing, the present invention is further illustrated.

Referring to shown in Fig. 1, present embodiment the technical solution adopted is that: it includes cope plate, punch-pin 1, upper cavity die 2, lower cavity die 3, bottom plate 5, lower template 6, upper jacking block 7, lower jacking block 8, cylindrical mandril 9;The punch-pin 1 passes through cope plate It is fixedly connected with the top shoe of press machine;Upper cavity die 2 is located at the lower section of punch-pin 1;Lower cavity die 3 is located at the lower section of upper cavity die 2, and leads to Fastener 4 or pin shaft is crossed to be fixedly connected with upper cavity die 2;Lower cavity die 3, bottom plate 5, lower template 6 are successively fixed by fastener 4 Connection;Bottom plate 5 is equipped with upper jacking block hole;Upper jacking block 7 is located in jacking block hole;Lower template 6 is equipped with stepped hole;It is cylindrical The top of mandril 9 is equipped with stair-step 9-1;The top of lower jacking block 8 and cylindrical mandril 9 is located in stepped hole;Upper jacking block 7, under Jacking block 8, cylindrical mandril 9 successively connect;The end of cylindrical mandril 9 is connect with press machine liftout tank;

Preferably, the intracavitary diameter of type of the lower cavity die 3 is greater than the intracavitary diameter of type of upper cavity die 2;

Preferably, the diameter of the upper jacking block 7 is greater than the diameter of lower jacking block 8.

The present invention also provides a upsetting formation methods of the big specification slab of larger ratio of height to diameter, with 400 × 2042mm's of Φ For cylindrical blank, it is comprised the following steps:

One, bar material baiting obtains the cylindrical blank 10 having a size of 400 × 2042mm of Φ;

Two, homogenization heat treatment;

Three, cylindrical blank 10 is heated to forming temperature and kept the temperature, and upsetting formation mold is integrally preheating to cylinder It more than body blank temperature and keeps the temperature;

Four, the mold after preheating insulation is mounted on press machine;Have to punch-pin 1, upper cavity die 2,3 even application of lower cavity die Machine graphitic lubricant;It is intracavitary (referring to figure by upper cavity die 2,3 type of lower cavity die is put by the cylindrical blank 10 of homogenization heat treatment Shown in 2);

Five, press machine drives punch-pin 1 to move downward, and the blank of the top 958mm length of cylindrical blank is initial in jumping-up When, it is limited in upper cavity die 2, when starting jumping-up, the part is indeformable, only passes the extruding force that punch-pin applies by the part The blank of lower part 1084mm length thereof is passed, and the ratio of height to diameter of the unrestricted blank in lower part is 2.7 < 3, so will not go out Existing unstability, even if in upsetting process, the cydariform of cylindrical blank 10 can be first since blank end face injustice causes unstability slightly The inner wall for first contacting lower cavity die 3, makes cylindrical blank 10 obtain school shape, guarantees the progress of upsetting process (shown in referring to Fig. 3); And the initial confined metal in the top of cylindrical blank 10, in upsetting process, with the continuous jumping-up of lower part blank, gradually The unrestricted lower cavity die 3 in lower part is entered, realizes that jumping-up (referring to shown in Fig. 4) is reduced in this way, being equivalent in upsetting process The ratio of height to diameter of blank, be more than ratio of height to diameter Partial Conversion to upsetting formation during, guarantee the height all the time of jumping-up Diameter is finally upset as required jumping-up part (referring to Fig. 5 institute than being both less than the 2.7 of designed lower part cavity plate jumping-up at the beginning Show);

Six, press ram drives punch-pin 1 to move upwards;Press machine liftout tank moves upwards, and makes jacking block 7, lower jacking block 8, cylindrical mandril 9 moves upwards, and the bottom of jumping-up part is risen to the outlet end of upper cavity die 2, is then taken out;By punch-pin 1 with Upper cavity die 2, lower cavity die 3 mold, and the fastening bolt being connected with press ram and lower table is unscrewed, mold is uninstalled.

Referring to shown in Fig. 6, if cylindrical blank original dimension is d1×h1, having a size of d after jumping-up2×h2, wherein ratio of height to diameter h1/d1=n (n > 3), fixed part h=h1-h2;The green part h in lower cavity die2/d2< 2, if taking limit h2/d2=2, then h2 =2d2, wherein h=h1-h2;Therefore volume deltaArrangement can obtain (d2 2-d1 2) So upsetting Thick condition needs to meetAn a kind of upsetting formation of the big specification slab of larger ratio of height to diameter of the present invention can be used Mold, so the corresponding jumping-up condition of this case upsetting formation mold needs to meetThe wherein intracavitary diameter d of the type of lower cavity die 32 Diameter d intracavitary greater than the type of upper cavity die 21, the high h of type chamber of lower cavity die 32, the total high h of the type chamber of the type chamber of upper cavity die 2 and lower cavity die1, Middle h1/d1=n (n > 3).

After adopting the above scheme, present embodiment has the beneficial effect that a kind of larger ratio of height to diameter of the present invention is big A upsetting formation mold and method for specification slab, the cylindrical blank by ratio of height to diameter greater than 3 is in deformation moment actual height Diameter, in H/D < 2.5, effectively avoids " Double drum type " and folds, realize the large plastometric set of big specification casting rod than control.

In addition, it should be understood that although this specification is described in terms of embodiments, but not each embodiment is only wrapped Containing an independent technical solution, this description of the specification is merely for the sake of clarity, and those skilled in the art should It considers the specification as a whole, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art The other embodiments being understood that.

Claims (1)

1. an a kind of upsetting formation method of the big specification slab of larger ratio of height to diameter, it is characterised in that: it is comprised the following steps:
(1), bar material baiting;
(2), homogenization heat treatment;
(3), cylindrical blank is heated to forming temperature and kept the temperature, and upsetting formation mold is integrally preheating to cylindrical blank More than temperature and keep the temperature, the upsetting formation mold it include punch-pin, upper cavity die, lower cavity die, bottom plate, lower template, on Jacking block, lower jacking block, cylindrical mandril;The punch-pin is fixedly connected by cope plate with the top shoe of press machine;Upper cavity die is set In the lower section of punch-pin;Lower cavity die is located at the lower section of upper cavity die, and is fixedly connected by fastener with upper cavity die, the lower cavity die The intracavitary diameter d of type2Diameter d intracavitary greater than the type of upper cavity die1, the high h of type chamber of lower cavity die2, the type chamber of upper cavity die and the type chamber of lower cavity die Total high h1, wherein h1/d1=n, wherein n > 3, jumping-up condition need to meetLower cavity die, bottom plate, lower template pass through Fastener is fixedly connected sequentially;Bottom plate is equipped with upper jacking block hole;Upper jacking block is located in jacking block hole;Lower template is equipped with rank Terraced hole;The top of cylindrical mandril is equipped with stair-step;The top of lower jacking block and cylindrical mandril is located in stepped hole;Upper top Block, lower jacking block, cylindrical mandril successively connect;
(4), the mold after preheating insulation is mounted on press machine;To punch-pin, upper cavity die, the organic graphite of lower cavity die even application Lubricant;It is intracavitary by upper cavity die, recessed model is put by the cylindrical blank of homogenization heat treatment;
(5), press machine drives punch-pin to move downward, and the upper blank of cylindrical blank is limited in fovea superior when jumping-up is initial In mould, when starting jumping-up, the part is indeformable, and the extruding force that punch-pin applies only is passed to lower part blank by the part, and The ratio of height to diameter of the unrestricted blank in lower part is less than 3, so being not in unstability, even if since blank end face injustice causes slightly Unstability, in upsetting process, the cydariform of cylindrical blank can contact the inner wall of lower cavity die first, and cylindrical blank is made to obtain school Shape guarantees the progress of upsetting process;And the initial confined metal in the top of cylindrical blank, in upsetting process, under The continuous jumping-up of portion's blank progresses into the unrestricted lower cavity die in lower part, realizes jumping-up, be finally upset as required jumping-up part;
(6), press ram drives punch-pin to move upwards;Press machine liftout tank moves upwards, and moves upwards cylindrical mandril, The outlet end that the bottom of jumping-up part is risen to upper cavity die, then takes out;Punch-pin and upper cavity die, lower cavity die are molded, it will be with pressure The fastening bolt that power machine sliding block is connected with lower table is unscrewed, and mold is uninstalled.
CN201710858743.6A 2017-09-13 2017-09-13 An a kind of upsetting formation method of the big specification slab of larger ratio of height to diameter CN107552700B (en)

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CN110180982A (en) * 2019-07-10 2019-08-30 哈尔滨工业大学 A kind of mold temperature is higher than the thermo shaping method of blank temperature

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