CN101972792A - Hot reverse-extrusion forming mold for large cup shell - Google Patents
Hot reverse-extrusion forming mold for large cup shell Download PDFInfo
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- CN101972792A CN101972792A CN 201010518555 CN201010518555A CN101972792A CN 101972792 A CN101972792 A CN 101972792A CN 201010518555 CN201010518555 CN 201010518555 CN 201010518555 A CN201010518555 A CN 201010518555A CN 101972792 A CN101972792 A CN 101972792A
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Abstract
The invention discloses a hot reverse-extrusion forming mold for a large cup shell, relating to a reverse-extrusion forming device. The invention can reduce a hot reverse-extrusion forming force of the large cup shell and solves the problem of low production efficiency in the prior art. A reverse-extrusion punch head is assembled on a pressure head of a pressing machine; an inner cavity of a reverse extrusion cylinder consists of a material-filling cavity, a transitional step and a reverse extrusion cavity, and the lower end of the reverse extrusion cylinder is provided with a limiting step; a base is fixed on a workbench surface of the pressing machine; the inner cavity of the base consists of an upper inner cavity, a middle inner hole and a lower inner cavity; the lower inner cavity is provided with a bearing base plate; a center hole of the bearing base plate is slidably matched with a mandril of the pressing machine, and an upper end face of the bearing base plate supports a material-ejecting rod; a big end of the material-ejecting rod is slidably matched with the middle inner hole, and a small end of the material-ejecting rod is slidably matched with a reverse extrusion cavity; an outer wall of the limiting step is slidably matched with a wall surface of the upper inner cavity; a flange is fixed with the upper end of the base by bolts; n cylindrical helical compression springs which are uniformly distributed are arranged between the reverse extrusion cylinder and the base, wherein n and m are positive integer.
Description
Technical field
The invention belongs to the cup shell field shaping technique, be specifically related to a kind of hot anti-extrusion device of large-scale cup shell.
Background technology
The anti-extrusion technology is the stress metal processing technology of a kind of advanced person's few nothing cutting, has characteristics such as " efficient, high-quality, low consumption ", and very high use value is all arranged technically and economically.
Cup shell is a backward extrusion typical case product.For the preparation of cup shell, mostly adopt the anti-extrusion technology at present both at home and abroad.Because material is in the three-dimensional compressive stress state in the anti-extrusion process, the material drag is stronger, and during metal flow and punch, die relative motion is all arranged, frictional force is bigger, and equipment tonnage is had relatively high expectations.For reducing forming force, bigger ferrous metal backward extrusion product all adopts hot anti-extrusion technology, but according to statistics: the hot backward extrusion punch diameter of ferrous metal mostly still is confined within 100 millimeters.
For reducing hot anti-extrusion power, forming force when the method that patent application " a kind of method and mould (application number is 200510012565.2) of making circular cog hot forged from generator protective ring " has taked the blank jacket to be shaped reduces circular cog hot forged from generator protective ring, patent application " hot impact extrusion moulding process of a kind of large annular barrel forging and device (application number is 200910074230.1) " is adopted and is split up into the hot impact extrusion forming force that multiformed method reduces the large annular barrel forging once being out of shape, these methods all can reduce hot anti-extrusion power, reach the purpose of " skinny device is done big living ", but production efficiency is lower.
Summary of the invention
The objective of the invention is to overcome the shortcoming of prior art, a kind of hot anti-extrusion mould of large-scale cup shell is provided, effectively reduce the forming force of the hot anti-extrusion technology of large-scale cup shell, enhance productivity.
The present invention is achieved by the following technical solutions:
A kind of hot anti-extrusion mould of large-scale cup shell, it is characterized in that: described mould comprises: backward extrusion drift, backward extrusion tube, flange, bolt, cylindroid helical-coil compression spring, base, pressure-bearing backing plate, ejector beam; Described backward extrusion drift is assemblied on the press ram; The inner chamber of described backward extrusion tube is made up of the concentric drums of two different inner diameters, upper part is a feeding chamber, lower part is the backward extrusion chamber, the internal diameter of described feeding chamber (d+ Δ d) is than the big Δ d of inner diameter d in described backward extrusion chamber, it is the transition shoulder of α that angle is arranged between described feeding chamber and the described backward extrusion chamber, α=10 °～45 °; The lower end of described backward extrusion tube has a limited step; The lower end of described backward extrusion tube is provided with n uniform spring dimple; Described base is fixed on the work top of forcing press; The inner chamber of described base is made up of the concentric drums of three different inner diameters, and upper part is the upper end inner chamber, and mid portion is the middle part endoporus, and lower part is the lower end inner chamber; The arranged outside of described middle part endoporus has the spring pit of n uniform column; Described lower end inner chamber is provided with described pressure-bearing backing plate; The centre bore of described pressure-bearing backing plate and the push rod of forcing press are slidingly matched; Described ejector beam is being supported in the upper surface of described pressure-bearing backing plate; Described ejector beam is the cylinder of up-small and down-big step, and its big end and described middle part endoporus are slidingly matched, and its small end and described backward extrusion chamber are slidingly matched; The wall of the outer wall of described limited step and described upper end inner chamber is slidingly matched; Described flange is fixed with the upper end of m described bolt and described base; Be provided with n uniform described cylindroid helical-coil compression spring between described backward extrusion tube and the described base; N uniform described cylindroid helical-coil compression spring is to be placed on accordingly in n uniform described spring dimple and the individual uniform described spring pit of n; Wherein, n and m are positive integer, and Δ d and α are positive number.
Described feeding chamber port position is processed with 10 ° of oblique cones and uses for guide.
The wall of the outer wall of described limited step and described upper end inner chamber slidably ultimate range equals a, also be that ultimate range between the baseplane of upper end inner chamber of the bottom surface of described backward extrusion tube and base equals a, the numerical value of a is required: greater than the height H of backward extrusion product and blank 1.2 times by the difference (H-h) of the height h of whole diameter reducing extrusion in the backward extrusion chamber and when not beginning anti-extrusion as yet, be a＞1.2 (H-h), wherein a, H and h are positive number.
The elastic force size of described cylindroid helical-coil compression spring, determine by following three conditions:
1. when the baseplane of the bottom surface of described backward extrusion tube and described upper end inner chamber distance equals a, total elastic force sum F of n described cylindroid helical-coil compression spring
Bullet 1Numerically should be greater than the weight G of described blank
BaseWeight G with described backward extrusion tube
Tube1.5 times of sum, i.e. F
Bullet 1＞1.5 (G
Base+ G
Tube);
2. when the bottom surface of described backward extrusion tube contacts with the baseplane of described upper end inner chamber, total elastic force sum F of n described cylindroid helical-coil compression spring
Bullet 2Numerically should less than make described blank by the feeding chamber of backward extrusion tube progressively by the diameter reducing extrusion deformation force F of diameter reducing extrusion in the backward extrusion chamber of backward extrusion tube
Subtract0.7 times, i.e. F
Bullet 2＜0.7F
Subtract
3. each described cylindroid helical-coil compression spring all is in the working range allowable in the above duty.
The above F
Bullet 1, F
Bullet 2, F
Subtract, F
Instead, G
BaseAnd G
TubeBe positive number.
Advantage of the present invention and good effect are:
(1) in the anti-extrusion process, part metals is flowed by counter pressing to, frictional force between blank of Chan Shenging and the backward extrusion tube can be very big therefrom, for middle-size and small-size mould, this frictional force can be overcome by mould structure itself, has correspondingly also just increased anti-extrusion power, and for large-scale cup shell anti-extrusion, this frictional force numerically can be very big, should not be overcome by mould itself.Mould among the present invention adopts the method for backward extrusion tube and blank servo-actuated, makes that in the anti-extrusion process, the backward extrusion tube has relative motion with respect to base, can eliminate the influence of partial frictional power, thereby reduce anti-extrusion power, and the labor-saving effect is obvious;
(2) before the distortion of blank diameter reducing extrusion, the backward extrusion tube has begun to slide into extreme lower position downwards under the drive of blank, can satisfy the space requirement that the backward extrusion tube will upwards slide in the follow-up anti-extrusion process;
(3) conventional hot anti-extrusion, the blank outer surface is coarse, and even, the not high defective of surface quality of product wall unevenness can appear in the gap inequality between blank and the moulding die cavity.And after in the mode of diameter reducing extrusion blank being pressed into the backward extrusion chamber by feeding chamber, almost very close to each other between blank and the backward extrusion chamber, can reduce to improve blank outer surface roughness simultaneously, improve the surface quality of hot backward extrusion product owing to the even phenomenon of the uneven wall unevenness that causes in gap;
(4) anti-extrusion end, take the backward extrusion product away after mould under the effect of the elastic force of gravity and cylindroid helical-coil compression spring, restPose rapidly, for next anti-extrusion is got ready, compared with prior art, improved production efficiency greatly.
Description of drawings
Fig. 1 is the structural representation of backward extrusion tube of the present invention;
Fig. 2 is the structural representation of base of the present invention;
View when Fig. 3 puts into tube for feed for the present invention with blank;
Fig. 4 depresses for backward extrusion drift of the present invention and the view when contacting blank;
Fig. 5 depresses blank, backward extrusion tube for backward extrusion drift of the present invention and is driven the view that slides into when contacting with the baseplane of the upper end inner chamber of base by blank downwards;
View when Fig. 6 arrives the backward extrusion chamber for backward extrusion drift of the present invention with the blank diameter reducing extrusion;
Fig. 7 is pressed into the view that blank carries out the anti-extrusion pilot process for backward extrusion drift of the present invention;
View when Fig. 8 finishes for anti-extrusion process of the present invention;
View when Fig. 9 breaks away from backward extrusion drift and backward extrusion tube for backward extrusion product of the present invention.
The specific embodiment
To shown in Figure 9, a kind of hot anti-extrusion mould of large-scale cup shell comprises: backward extrusion drift 2, backward extrusion tube 4, flange 5, bolt 6, cylindroid helical-coil compression spring 7, base 8, pressure-bearing backing plate 9, ejector beam 11 as Fig. 1; Described backward extrusion drift 2 is assemblied on the press ram 1; The inner chamber of described backward extrusion tube 4 is made up of the concentric drums of two different inner diameters, upper part is feeding chamber 4-2, lower part is backward extrusion chamber 4-4, the internal diameter of described feeding chamber 4-2 (d+ Δ d) is than the big Δ d of inner diameter d of described backward extrusion chamber 4-4, it is the transition shoulder 4-3 of α that angle is arranged between described feeding chamber 4-2 and the described backward extrusion chamber 4-4, α=10 °～45 °; The lower end of described backward extrusion tube 4 has a limited step 4-5; The lower end of described backward extrusion tube 4 is provided with n uniform spring dimple 4-6; Described base 8 is fixed on the work top of forcing press; The inner chamber of described base 8 is made up of the concentric drums of three different inner diameters, and upper part is upper end inner chamber 8-1, and mid portion is middle part endoporus 8-4, and lower part is lower end inner chamber 8-5; The arranged outside of described middle part endoporus 8-4 has the spring pit 8-3 of n uniform column; Described lower end inner chamber 8-5 is provided with described pressure-bearing backing plate 9; The centre bore of described pressure-bearing backing plate 9 and the push rod of forcing press 10 are slidingly matched; Described ejector beam 11 is being supported in the upper surface of described pressure-bearing backing plate 9; Described ejector beam 11 is the cylinder of up-small and down-big step, and its big end and described middle part endoporus 8-4 are slidingly matched, and its small end and described backward extrusion chamber 4-4 are slidingly matched; The wall of the outer wall of described limited step 4-5 and described upper end inner chamber 8-1 is slidingly matched; Described flange 5 usefulness m described bolts 6 are fixed with the upper end of described base 8; Be provided with n uniform described cylindroid helical-coil compression spring 7 between described backward extrusion tube 4 and the described base 8; N uniform described cylindroid helical-coil compression spring 7 is to be placed on accordingly in n uniform described spring dimple 4-6 and the individual uniform described spring pit 8-3 of n; Wherein, n and m are positive integer, and Δ d and α are positive number.
Described feeding chamber 4-2 port position is processed with 10 ° of oblique cone 4-1 and uses for guide.
The wall of the outer wall of described limited step 4-5 and described upper end inner chamber 8-1 slidably ultimate range equals a, also be that ultimate range between the baseplane 8-2 of upper end inner chamber 8-1 of the bottom surface 4-7 of described backward extrusion tube 4 and base 8 equals a, the numerical value of a is required: greater than the height H of backward extrusion product 12 and blank 3 1.2 times by the difference (H-h) of the height h of whole diameter reducing extrusion in the 4-4 of backward extrusion chamber and when not beginning anti-extrusion as yet, be a＞1.2 (H-h), wherein a, H and h are positive number.
The elastic force size of described cylindroid helical-coil compression spring 7, determine by following three conditions:
1. when the baseplane 8-2 of the bottom surface 4-7 of described backward extrusion tube 4 and described upper end inner chamber 8-1 distance equals a, total elastic force sum F of n described cylindroid helical-coil compression spring 7
Bullet 1Numerically should be greater than the weight G of described blank 3
BaseWeight G with described backward extrusion tube 4
Tube1.5 times of sum, i.e. F
Bullet 1＞1.5 (G
Base+ G
Tube), guarantee before backward extrusion drift 2 contact blanks 3, to rely on total elastic force sum F of the individual described cylindroid helical-coil compression spring 7 of n
Bullet 1 Backward extrusion tube 4 can be upspring with blank 3, make the upper surface of limited step 4-5 contact with the lower surface of flange 5;
2. when the bottom surface 4-7 of described backward extrusion tube 4 contacts with the baseplane 8-2 of described upper end inner chamber 8-1, total elastic force sum F of n described cylindroid helical-coil compression spring 7
Bullet 2Numerically should less than make described blank 3 by the feeding chamber 4-2 of backward extrusion tube 4 progressively by the diameter reducing extrusion deformation force F of diameter reducing extrusion in the backward extrusion chamber 4-4 of backward extrusion tube 4
Subtract0.7 times, i.e. F
Bullet 2＜0.7F
Subtract, guarantee that the bottom surface 4-7 of described backward extrusion tube 4 before the diameter reducing extrusion distortion takes place described blank 3 contacts with the baseplane 8-2 of described upper end inner chamber 8-1;
3. each described cylindroid helical-coil compression spring 7 all is in the working range allowable in the above duty.
Make described blank 3 by the feeding chamber 4-2 of backward extrusion tube 4 progressively by the diameter reducing extrusion deformation force F of diameter reducing extrusion in the backward extrusion chamber 4-4 of backward extrusion tube 4
SubtractWith described blank 3 be anti-extrusion power F in the process of backward extrusion product by anti-extrusion
InsteadBetween relation should satisfy F
Subtract＜0.2F
Instead, guarantee in the diameter reducing extrusion process, not take place the backward extrusion modification.
The above F
Bullet 1, F
Bullet 2, F
Subtract, F
Instead, G
BaseAnd G
TubeBe positive number, concrete numerical value all can be calculated by conventional hot extrusion computing formula.
Described bolt 6 is the knockout presses when being used for fixing described flange 5 and bearing 12 demouldings of backward extrusion product.
The hot anti-extrusion processing step of using a kind of large-scale cup shell of the present invention is as follows:
1. the blank 3 after will heating is placed in the feeding chamber 4-2 of backward extrusion tube 4;
2. press ram 1 presses down, and drives backward extrusion drift 2 and touches blank 3;
3. press ram 1 continues to press down, drive backward extrusion drift 2 and depress blank 3, backward extrusion tube 4 begins to lower slider at the wall of the upper end inner chamber 8-1 of the drive lower edge of blank 3 base 8, and n uniform cylindroid helical-coil compression spring 7 of compression, bottom surface 4-7 up to backward extrusion tube 4 contacts with the baseplane 8-2 of the upper end inner chamber 8-1 of base 8, and n is a positive integer;
4. press ram 1 continues to press down, drive backward extrusion drift 2 and depress blank 3, blank 3 by the feeding chamber 4-2 of backward extrusion tube 4 progressively by diameter reducing extrusion in the backward extrusion chamber 4-4 of backward extrusion tube 4, arrived in the 4-4 of backward extrusion chamber by whole diameter reducing extrusion and the applying of the upper surface of the bottom of blank 3 and ejector beam 11 up to blank 3, this moment, blank 3 did not begin anti-extrusion as yet, it highly is h, and h is a positive number;
5. press ram 1 continues to press down, drive backward extrusion drift 2 and be pressed into blank 3, beginning anti-extrusion process, part metals is flowed by counter pressing to, drive the wall upwards slip of backward extrusion tube 4 along the upper end inner chamber 8-1 of base 8, finish up to the anti-extrusion process, blank 3 is a backward extrusion product 12 by anti-extrusion in this process, the height of backward extrusion product 12 equals H, and H is a positive number;
6. press ram 1 stops to press down and oppositely mentioning, driving backward extrusion drift 2, backward extrusion product 12 and backward extrusion tube 4 moves upward, the upper surface of the limited step 4-5 of backward extrusion tube 4 contacts with the lower surface of flange 6, backward extrusion tube 4 is limited motion, and backward extrusion product 12 in the process that continues to move upward by stripper (not marking among the figure) constrained motion, break away from backward extrusion drift 2, the push rod 10 of forcing press upwards ejects then, promote ejector beam 11 and upwards eject backward extrusion product 12, backward extrusion product 12 breaks away from backward extrusion tube 4, is removed subsequently;
7. the push rod 10 of forcing press is regained downwards, ejector beam 11 slides into downwards under the gravity effect with pressure-bearing backing plate 9 and contact, backward extrusion tube 4 keeps the upper surface of its limited step 4-5 and the contacted state of lower surface of flange 5 under the effect of the elastic force of n uniform cylindroid helical-coil compression spring 7, mould returns to original state;
8. repeat above-mentioned processing step and 1. arrive 7., can continuously finish the hot anti-extrusion of large-scale cup shell.
Described step is 1. in 7., backward extrusion tube 4 along the wall of the upper end inner chamber 8-1 of base 8 slidably ultimate range equal a, the numerical value of a is required: greater than the height H of backward extrusion product 12 and blank 3 1.2 times by the difference (H-h) of the height h of whole diameter reducing extrusion in the 4-4 of backward extrusion chamber and when not beginning anti-extrusion as yet, be a＞1.2 (H-h), a is a positive number.
When 3. described step finished, backward extrusion tube 4 equaled a along the wall of the upper end inner chamber 8-1 of base 8 to the distance of lower slider, guaranteed that backward extrusion tube 4 has enough spaces of upwards sliding in follow-up anti-extrusion process.
When 5. described step finished, backward extrusion tube 4 equaled b along the distance that the wall of the upper end inner chamber 8-1 of base 8 upwards slides, and wherein b is positive number and b＜a, guarantees that the upper surface of the limited step 4-5 of backward extrusion tube 4 does not contact with the lower surface of flange 6.
When 7. described step finished, the baseplane 8-2 of the upper end inner chamber 8-1 of the bottom surface 4-7 of backward extrusion tube 4 and base 8 distance equaled a, guarantees normally carrying out of subsequent technique process circulation.
Described step 4. in blank 3 by the feeding chamber 4-2 of backward extrusion tube 4 progressively by the diameter reducing extrusion deformation force F of diameter reducing extrusion in the backward extrusion chamber 4-4 of backward extrusion tube 4
SubtractWith described step 5. in blank 3 be anti-extrusion power F in the process of backward extrusion product 12 by anti-extrusion
InsteadBetween relation should satisfy F
Subtract＜0.2F
Instead, guarantee in the diameter reducing extrusion process, not take place the backward extrusion distortion, wherein F
SubtractWith F
InsteadBe positive number, concrete numerical value all can be calculated by conventional hot extrusion computing formula.
Claims (4)
1. the hot anti-extrusion mould of a large-scale cup shell, it is characterized in that: described mould comprises: backward extrusion drift (2), backward extrusion tube (4), flange (5), bolt (6), cylindroid helical-coil compression spring (7), base (8), pressure-bearing backing plate (9), ejector beam (11); Described backward extrusion drift (2) is assemblied on the press ram (1); The inner chamber of described backward extrusion tube (4) is made up of the concentric drums of two different inner diameters, upper part is feeding chamber (4-2), lower part is backward extrusion chamber (4-4), the internal diameter of described feeding chamber (4-2) (d+ Δ d) is than the big Δ d of inner diameter d in described backward extrusion chamber (4-4), it is the transition shoulder (4-3) of α that angle is arranged between described feeding chamber (4-2) and the described backward extrusion chamber (4-4), α=10 °～45 °; The lower end of described backward extrusion tube (4) has a limited step (4-5); The lower end of described backward extrusion tube (4) is provided with n uniform spring dimple (4-6); Described base (8) is fixed on the work top of forcing press; The inner chamber of described base (8) is made up of the concentric drums of three different inner diameters, and upper part is upper end inner chamber (8-1), and mid portion is middle part endoporus (8-4), and lower part is lower end inner chamber (8-5); The arranged outside of described middle part endoporus (8-4) has the spring pit (8-3) of n uniform column; Described lower end inner chamber (8-5) is provided with described pressure-bearing backing plate (9); The push rod (10) of the centre bore of described pressure-bearing backing plate (9) and forcing press is slidingly matched; Described ejector beam (11) is being supported in the upper surface of described pressure-bearing backing plate (9); Described ejector beam (11) is the cylinder of up-small and down-big step, and its big end and described middle part endoporus (8-4) are slidingly matched, and its small end and described backward extrusion chamber (4-4) are slidingly matched; The wall of the outer wall of described limited step (4-5) and described upper end inner chamber (8-1) is slidingly matched; Described flange (5) is fixed with m the described bolt (6) and the upper end of described base (8); Be provided with n uniform described cylindroid helical-coil compression spring (7) between described backward extrusion tube (4) and the described base (8); N uniform described cylindroid helical-coil compression spring (7) is to be placed on accordingly in n uniform described spring dimple (4-6) and the individual uniform described spring pit (8-3) of n; Wherein, n and m are positive integer, and Δ d and α are positive number.
2. according to the hot anti-extrusion mould of the described a kind of large-scale cup shell of claim 1, it is characterized in that: described feeding chamber (4-2) port position is processed with 10 ° of oblique cones (4-1).
3. according to the hot anti-extrusion mould of the described a kind of large-scale cup shell of claim 1, it is characterized in that: the wall of the outer wall of described limited step (4-5) and described upper end inner chamber (8-1) slidably ultimate range equals a, also be that ultimate range between the baseplane (8-2) of upper end inner chamber (8-1) of the bottom surface (4-7) of described backward extrusion tube 4 and base (8) equals a, the numerical value of a is required: 1.2 times of the difference (H-h) of and height h when as yet not beginning anti-extrusion interior by whole diameter reducing extrusion to backward extrusion chamber (4-4) greater than the height H of backward extrusion product (12) and blank (3), be a＞1.2 (H-h), wherein a, H and h are positive number.
4. according to the hot anti-extrusion mould of the described a kind of large-scale cup shell of claim 1, it is characterized in that: the elastic force size of described cylindroid helical-coil compression spring (7), determine by following three conditions:
1. when baseplane (8-2) distance of the bottom surface (4-7) of described backward extrusion tube (4) and described upper end inner chamber (8-1) equals a, total elastic force sum F of n described cylindroid helical-coil compression spring (7)
Bullet 1Numerically should be greater than the weight G of described blank (3)
BaseWeight G with described backward extrusion tube (4)
Tube1.5 times of sum, i.e. F
Bullet 1＞1.5 (G
Base+ G
Tube);
2. when the baseplane (8-2) of the bottom surface (4-7) of described backward extrusion tube (4) and described upper end inner chamber (8-1) when contacting, total elastic force sum F of n described cylindroid helical-coil compression spring (7)
Bullet 2Numerically should less than make described blank (3) by the feeding chamber (4-2) of backward extrusion tube (4) progressively by the diameter reducing extrusion deformation force F of diameter reducing extrusion in the backward extrusion chamber (4-4) of backward extrusion tube (4)
Subtract0.7 times, i.e. F
Bullet 2＜0.7F
Subtract
3. each described cylindroid helical-coil compression spring (7) all is in the working range allowable in the above duty;
The above F
Bullet 1, F
Bullet 2, F
Subtract, G
BaseAnd G
TubeBe positive number.
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| CN2010105185557A CN101972792B (en) | 2010-10-22 | 2010-10-22 | Hot reverse-extrusion forming mold for large cup shell |
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|---|---|---|---|
| CN2010105185557A CN101972792B (en) | 2010-10-22 | 2010-10-22 | Hot reverse-extrusion forming mold for large cup shell |
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| CN103551413A (en) * | 2013-10-31 | 2014-02-05 | 江苏森威精锻有限公司 | Inner hexagonal forming die for small end surface of ball pin |
| CN103611753A (en) * | 2013-12-09 | 2014-03-05 | 北京机电研究所 | Forming device and method for thickening wall of pipe |
| CN103639227A (en) * | 2013-12-09 | 2014-03-19 | 哈尔滨工业大学 | Die and method for manufacturing ultrathin-wall small cylinder part |
| CN103920733A (en) * | 2014-03-19 | 2014-07-16 | 长治市丰雨机械有限公司 | Cup-shaped bottom hole part radial extrusion positioning apparatus |
| CN105312349A (en) * | 2014-06-26 | 2016-02-10 | 北京有色金属研究总院 | Method of increasing deformation quantity of cylinder bottom of metal backward-extrusion cylindrical part |
| CN106862290A (en) * | 2017-02-24 | 2017-06-20 | 中北大学 | A kind of cup shell backward extrusion forming device and manufacturing process |
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| CN111730893A (en) * | 2020-06-18 | 2020-10-02 | 王志超 | Ecological product is with degradation cup extrusion control system |
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