CN201283396Y - Deep-drawing mold of concave die without flange edge - Google Patents
Deep-drawing mold of concave die without flange edge Download PDFInfo
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- CN201283396Y CN201283396Y CNU2008201668975U CN200820166897U CN201283396Y CN 201283396 Y CN201283396 Y CN 201283396Y CN U2008201668975 U CNU2008201668975 U CN U2008201668975U CN 200820166897 U CN200820166897 U CN 200820166897U CN 201283396 Y CN201283396 Y CN 201283396Y
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Abstract
The utility model discloses a deep tandem die of a cavity die without a flange edge. The radius of a cavity die filleted corner in a tandem die is equal to the radial length from the edge of the cavity die to a die cavity and is transitioned along the circumference. A terrace die is installed on the lower end of an upper template and is installed in a terrace die fixing plate and a binder ring hole, and the terrace die fixing plate is jointed with the upper template through a screw thread. More than three through holes with steps are arranged on the upper template, material return screws are installed in the through holes, the material return screws which are exposed from the lower end surface of the upper template are installed in springs in turn, the end portions of the material return screws are connected with a blinder ring screw thread, a cavity die without the flange edge is installed on the center of the upper end surface of a lower template, a cavity die heel block is installed on the center of the cavity die without the flange edge, and a head part spring is supported on the lower end surface of the concave die heel block. The die can improve the shaping performance of plates, compared with pyramidal face cavity dies, pyramidal face rigidity flanging ring dies and tandem dies with dense technical blind holes on the upper plane of the cavity dies, the extreme deep-drawing height of deep-drawing pieces is improved without breaking, one time deep-drawing can replace multiple deep-drawings, and the cost and energy consumption are lowered.
Description
Technical field
The utility model relates to the equipment that metal blank is shaped, and especially relates to a kind of deep drawing mould that can't flange edge die.
Background technology
Adopt to improve the process structure of steel die, avoid or effectively suppress wrinkling and break in the sheet material forming, improve the new technology research and development of sheet material forming limit capacity, be the hot subject in the domestic and international sheet-metal press working field always.
At present existing following improved steel die structure: 1. beat intensive technology small blind hole cupping tool on the die on the plane, utilize these technology small blind holes storage lubricating oil and when pull and stretch, reduce contact area with blank, thereby minimizing tension, suppressed to a certain extent to break in the sheet material forming, improved the sheet material forming limit capacity, but this process structure processing time consuming, the cost height is difficult to promote in actual production and comes.
2. conical surface die and conical surface rigid blank holder ring mould, the face that die is contacted with blank is processed into the process that the conical surface carries out pull and stretch with the face that blank holder contacts with blank, this method can improve the Limit Drawing height to a certain extent and drawing crack and wrinkling not take place, but just for plate thicker (or relative thickness is bigger), and pull and stretch just has certain effect when having big fillet radius drawing part, and use occasion is limited.
Summary of the invention
The purpose of this utility model is to provide a kind of deep drawing mould that can't flange edge die, can greatly improve the Limit Drawing height of drawing part and drawing crack does not take place, perhaps wrinkling process and the mould that is controlled within the qualified products requirement.
The technical scheme that its technical problem that solves the utility model adopts is:
The utility model comprises mould assembly and lower mould assembly, wherein:
1) goes up mould assembly: comprise cope match-plate pattern, guide pin bushing, punch retainer material returned screw, spring, punch and holding pad; The punch of leaving pore is equipped with at center, cope match-plate pattern lower surface, punch is sleeved in punch retainer hole and the holding pad hole from top to bottom successively, and form with punch retainer hole and holding pad hole and to be slidingly matched, punch retainer and cope match-plate pattern adopt thread connection, have the through hole more than three on the cope match-plate pattern of punch outside and the punch retainer, material returned screw all is housed in each through hole, expose on the material returned screw of cope match-plate pattern lower surface and be sleeved on spring successively, in punch retainer and the holding pad hole, material returned screw end is threaded with holding pad, have the screwed hole more than three on the holding pad outside the material returned screw, plural guide pin bushing is equipped with in the cope match-plate pattern lower end of punch retainer and holding pad outside.
2) lower mould assembly: comprise lower bolster, guide pillar, die, die cushion block and head part spring; In the die at center, lower bolster upper surface the die cushion block is housed, the head part spring is equipped with in the lower surface of die cushion block, die cushion block and die inner chamber form and are slidingly matched, the head part spring withstands on the die cushion block large end face, die cushion block center line and punch central lines, die on lower bolster outside are equipped with plural guide pillar and are slidingly matched with the consistent also formation of guide pin bushing quantity on the cope match-plate pattern.
Described die, the appearance profile shape of die and appearance and size and drawing part expansion shape and consistent size.
Described die, when pull and stretch rule drawing part, the i.e. drawing part of the revolving body floor projection size of representing with a diameter parameters, the expansion profile and the consistent size of pull and stretch die profile and size and regular shape drawing part, the die profile radius in the cupping tool equal the die edge to the die cavity radical length and along all transition.
Described die, when the erose drawing part of pull and stretch floor projection, the i.e. drawing part of the floor projection shape that can not represent with a parameter, the expansion profile and the consistent size of pull and stretch die profile and size and erose drawing part, die profile radius in the cupping tool equals the die edge to the die cavity radical length, the die edge shape is irregular, the die edge is unequal to the die cavity radical length, so the die profile radius along week is inconsistent, but between each die profile radius in week, want rounding off.
The beneficial effect that the utlity model has is:
This kind mould structure can greatly improve the forming property of plate, with beat intensive technology small blind hole cupping tool on the plane on the die and compare with conical surface rigid blank holder ring mould with conical surface die, this technology can improve the Limit Drawing height of drawing part biglyyer and not break, adopt such mould structure to substitute repeatedly pull and stretch by once drawing, greatly reduced die manufacturing cost and energy consumption.
Description of drawings
Fig. 1 can't flange edge die the deep drawing die structure dwg.
Fig. 2 conical surface die and conical surface rigid blank holder ring mould structure chart.
Play the cupping tool structure chart of intensive technology small blind hole on Fig. 3 a die on the plane.
Play intensive technology small blind hole die front view on Fig. 3 b plane.
Beat intensive technology small blind hole die vertical view on Fig. 3 c plane.
Fig. 4 can't flange edge die deep drawing mould pull and stretch postforming limiting figure.
Fig. 5 conical surface die and conical surface rigid blank holder ring mould pull and stretch postforming limiting figure.
Beat intensive technology small blind hole cupping tool pull and stretch postforming limiting figure on Fig. 6 die on the plane.
Fig. 7 can't flange edge die the deep drawing mould do not suppress preceding state diagram.
Fig. 8 can't flange edge die the compacting of deep drawing mould finish after state diagram.
Fig. 9 a cylindrical shape drawing part figure.
Fig. 9 b cylindrical shape drawing part expanded view.
Fig. 9 c cylindrical shape die figure.
Fig. 9 d box-like drawing part front view.
Fig. 9 e box-like drawing part vertical view.
Fig. 9 f box-like drawing part expanded view.
Fig. 9 g box-like die front view.
Fig. 9 h box-like die vertical view.
Among the figure: 1, cope match-plate pattern, 2, guide pin bushing, 3, punch retainer, 4, material returned screw, 5, spring, 6, punch, 7, holding pad, 8, lower bolster, 9, guide pillar, 10 dies, 11, the die cushion block, 12, the head part spring, 13, plate.
The specific embodiment
On the basis of existing mold design feature, proposed can't flange edge die the deep drawing mould.The die outer shape of this kind mould and size and drawing part launch profile and consistent size, and die profile radius equals the die edge to the die cavity radical length and along all transition.This mould structure has following characteristics: during (1) pull and stretch, the time of rigid blank holder circle effect blank peripheral edge portion is shorter, but because beginning just has been pressed on the arc surface, and arc surface radially reduces, so thickening, plate can not surpass the blank initial plane, when initial pressure-pad-force was got bigger numerical, the blank outer rim can not turned over and be stuck up; (2) after the blank holder effect is finished, the frictional resistance that blank produces owing to the effect that is not subjected to blank holder, thereby the increment that is used to overcome the radially tension of frictional resistance just do not needed, so radially tension reduces, the trend of breaking weakens during pull and stretch, and pull and stretch ratio or deformation extent are bigger; (3) plate is thick in owing to be subjected to die entrance to its compression, and the hoop pressure stress that is subjected to of cell cube is littler than the pressure that is subjected on the face-flange herein, plate is flowed through, and thickness is attenuate behind the die entrance, and the therefore same wrinkling situation of the straight wall cup shell of pull and stretch can be improved i.e. pull and stretch better quality.This mould can greatly improve the Limit Drawing height of drawing part and drawing crack not take place, and can replace repeatedly pull and stretch by once drawing, has reduced die cost and energy consumption.Fig. 1 be can't flange edge die the deep drawing die structure dwg, Fig. 2 is conical surface die and conical surface rigid blank holder ring mould structure chart, Fig. 3 a plays intensive technology small blind hole cupping tool structure chart on the plane on the die, Fig. 3 b plays intensive technology small blind hole die front view on the plane, Fig. 3 c beats intensive technology small blind hole die vertical view on the plane.It is consistent with body diameter to get blank diameter, i.e. diameter D=115mm, blank material 08Al, thickness t=1mm, protruding, die gap 1.15mm. elastic modulus E=206.8Gpa, Poisson's ratio v=0.3, strain hardening factor K=537Mpa, yield limit σ
s=110.3Mpa, press Fig. 1, Fig. 2, Fig. 3 a and Fig. 3 b and Fig. 3 c die structure size, obtain behind pull and stretch height H=21mm: deep drawing mould pull and stretch postforming limiting figure (Fig. 4) that can't flange edge die, conical surface die and conical surface rigid blank holder ring mould pull and stretch postforming limiting figure (Fig. 5), beat the cupping tool pull and stretch postforming limiting figure (Fig. 6) of intensive technology small blind hole on the die on the plane, comparison diagram 4 and Fig. 5 and Fig. 6 find out, after can't the deep drawing mould pull and stretch of flange edge die, drawing part does not break, and after beating intensive technology small blind hole cupping tool pull and stretch on conical surface die and conical surface rigid blank holder ring mould and the die on the plane, drawing part breaks or is in the critical condition of breaking.
Deep drawing mould such as Fig. 7, shown in Figure 8 that can't flange edge die, the utility model comprises mould assembly and lower mould assembly, wherein:
1) goes up mould assembly: comprise cope match-plate pattern 1, guide pin bushing 2, punch retainer 3 material returned screws 4, spring 5, punch 6 and holding pad 7; The punch 6 of leaving pore is equipped with at center, cope match-plate pattern 1 lower surface, punch 6 is sleeved in punch retainer 3 holes and holding pad 7 holes from top to bottom successively, and form with punch retainer 3 holes and holding pad 7 holes and to be slidingly matched, punch retainer 3 adopts thread connection with cope match-plate pattern 1, have the through hole more than three on the cope match-plate pattern 1 of punch 6 outsides and the punch retainer 3, material returned screw 4 all is housed in each through hole, expose on the material returned screw 4 of cope match-plate pattern 1 lower surface and be sleeved on spring 5 successively, in punch retainer 3 and holding pad 7 holes, material returned screw 4 ends are threaded with holding pad 7, have the screwed hole more than three on the holding pad 7 outside the material returned screw 4, plural guide pin bushing 2 is equipped with in cope match-plate pattern 1 lower end of punch retainer 3 and holding pad 7 outsides;
2) lower mould assembly: comprise lower bolster 8, guide pillar 9, die 10, die cushion block 11 and head part spring 12; In the die 10 at center, lower bolster 8 upper surface die cushion block 11 is housed, head part spring 12 is equipped with in the lower surface of die cushion block 11, die cushion block 11 forms with die 10 inner chambers and is slidingly matched, head part spring 12 withstands on die cushion block 11 large end faces, it is consistent with guide pin bushing quantity on the cope match-plate pattern and form and be slidingly matched that die cushion block 11 center lines and punch 6 central lines, die 10 outsides on the lower bolster are equipped with plural guide pillar.
Described die 10, the appearance profile shape of die 10 and appearance and size and drawing part expansion shape and consistent size.
When pull and stretch rule drawing part, the i.e. drawing part of the revolving body floor projection size of representing with a diameter parameters, the expansion profile and the consistent size of pull and stretch die profile and size and regular shape drawing part, the die profile radius in the cupping tool equal the die edge to the die cavity radical length and along all transition.As the pull and stretch cylindrical part, the cylindrical part expansion shape is circular, the cylindrical part development size is represented with diameter, therefore the die profile is circular, circular die appearance and size is represented with diameter, die profile and size and cylindrical part expansion shape and consistent size, promptly body diameter equals the cylindrical part deployment diameter, and die profile radius equals the difference of circular radius in die profile radius and the die and along the circumference transition.
Described die 10, when the erose drawing part of pull and stretch floor projection, the i.e. drawing part of the floor projection shape that can not represent with a parameter, the expansion profile and the consistent size of pull and stretch die profile and size and erose drawing part, die profile radius in the cupping tool equals the die edge to the die cavity radical length, the die edge shape is irregular, the die edge is unequal to the die cavity radical length, so the die profile radius along week is inconsistent, but between each die profile radius in week, want rounding off.As the pull and stretch box part, the box part expansion shape is irregular, the box part development size can not be represented with a parameter, therefore the die profile is irregular, the die profile can not be with a size Expressing, die profile and size and box part expansion shape and consistent size, die profile radius equals irregular die edge to the die cavity radical length, because the die edge shape is irregular, unequal along the die edge to the die cavity radical length, die profile radius is inconsistent, but will be along all rounding ofves between each die profile radius.
Described die 10, the appearance profile shape of die 10 and appearance and size and drawing part expansion shape and consistent size.As Fig. 9 a is cylindrical shape drawing part figure, Fig. 9 b cylindrical shape drawing part expanded view, and expansion shape is circular, and development size represents that with diameter D Fig. 9 c is cylindrical shape die figure, and the profile of cylindrical shape die is consistent with cylindrical shape drawing part expansion shape, is circle.Cylindrical shape die appearance and size is represented with diameter D and is equaled cylindrical shape drawing part development size D.
Fig. 9 d is a box-like drawing part front view, Fig. 9 e is a box-like drawing part vertical view, Fig. 9 f is a box-like drawing part expanded view, Fig. 9 g is a box-like die front view, Fig. 9 h is a box-like die vertical view, and box-like die outer shape and size are launched profile and consistent size (Fig. 9 f and Fig. 9 h outer shape are consistent) with the box-like drawing part.
Described die 10, when pull and stretch rule drawing part, i.e. the drawing part of the revolving body floor projection size of representing with a diameter parameters, the expansion profile and the consistent size of pull and stretch die profile and size and regular shape drawing part.Die profile radius in the cupping tool equals the die edge to the die cavity radical length and along all transition.As Fig. 9 a is cylindrical shape drawing part figure, Fig. 9 b cylindrical shape drawing part expanded view, and expansion shape is circular, and development size represents that with diameter D Fig. 9 c is cylindrical shape die figure, and the profile of cylindrical shape die is consistent with cylindrical shape drawing part expansion shape, is circle.Cylindrical shape die appearance and size is represented with diameter D, and is equaled cylindrical shape drawing part development size D.Die profile radius equals the poor of die profile radius and the interior circular radius of die, promptly
, and along the circumference transition.
Described die 10, when the erose drawing part of pull and stretch floor projection, i.e. the drawing part of the floor projection shape that can not represent with a parameter, the expansion profile and the consistent size of pull and stretch die profile and size and erose drawing part.Die profile radius in the cupping tool equals the die edge to the die cavity radical length, because the die edge shape is irregular, the die edge is to die cavity radical length and unequal, thus the die profile radius in edge week and inconsistent, but between each die profile radius in week, want rounding off.As Fig. 9 d is box-like drawing part front view, Fig. 9 e is a box-like drawing part vertical view, Fig. 9 f is a box-like drawing part expanded view, Fig. 9 g is a box-like die front view, Fig. 9 h is a box-like die vertical view, and box-like die outer shape and size are launched profile and consistent size (Fig. 9 f and Fig. 9 h outer shape are consistent) with the box-like drawing part.Because the die profile radius in the cupping tool equals the die edge to the die cavity radical length, and die edge to die cavity radical length equals S respectively
1, S
2, S
3(Fig. 9 h) or the like is because S
1, S
2, S
3Each is unequal, and die profile radius R equals S respectively along one week and unequal of shape in the die
1, S
2, S
3, or the like, but will be along all rounding ofves between each die profile radius.
Operation principle of the present utility model is as follows:
When last mould assembly was also not descending, punch 6 lower planes and holding pad 7 lower planes had certain difference.Pretension state at the beginning of this moment, spring 5 had one, as shown in Figure 1.Last mould assembly continues to come downwards to plane contact on holding pad 7 lower planes and the plate 13 that is placed on the die 10, holding pad 7 keeps under the motionless situation subsequently, when punch 6 comes downwards to plane on the contact plate 13, spring 5 decrements increase, punch 6 continues descending, die cushion block 11 is moving downwards, and head part spring 12 is compressed.Punch 6 comes downwards to pull and stretch and finishes, as shown in Figure 2.It is up to go up subsequently mould assembly, and when punch 6 was up, die cushion block 11 is up motion under the effect of head part spring 12, with workpiece jack-up.
The above-mentioned specific embodiment is used for the utility model of explaining; rather than the utility model limited; in the protection domain of spirit of the present utility model and claim, any modification and change to the utility model is made all fall into protection domain of the present utility model.
Claims (4)
- One kind can't flange edge die the deep drawing mould, it is characterized in that comprising mould assembly and lower mould assembly, wherein:1) goes up mould assembly: comprise cope match-plate pattern (1), guide pin bushing (2), punch retainer (3) material returned screw (4), spring (5), punch (6) and holding pad (7); The punch (6) of leaving pore is equipped with at cope match-plate pattern (1) center, lower surface, punch (6) is sleeved in punch retainer (3) hole and holding pad (7) hole from top to bottom successively, and form with punch retainer (3) hole and holding pad (7) hole and to be slidingly matched, punch retainer (3) adopts thread connection with cope match-plate pattern (1), have the through hole more than three on the cope match-plate pattern (1) of punch (6) outside and the punch retainer (3), material returned screw (4) all is housed in each through hole, expose on the material returned screw (4) of cope match-plate pattern (1) lower surface and be sleeved on spring (5) successively, in punch retainer (3) and holding pad (7) hole, material returned screw (4) end is threaded with holding pad (7), have the screwed hole more than three on the holding pad (7) outside the material returned screw (4), plural guide pin bushing (2) is equipped with in cope match-plate pattern (1) lower end of punch retainer (3) and holding pad (7) outside;2) lower mould assembly: comprise lower bolster (8), guide pillar (9), die (10), die cushion block (11) and head part spring (12); In the die (10) at lower bolster (8) center, upper surface die cushion block (11) is housed, head part spring (12) is equipped with in the lower surface of die cushion block (11), die cushion block (11) forms with die (10) inner chamber and is slidingly matched, head part spring (12) withstands on die cushion block (11) large end face, die cushion block (11) center line and punch (6) central lines, the die on the lower bolster (10) outside are equipped with plural guide pillar and are slidingly matched with the consistent also formation of guide pin bushing quantity on the cope match-plate pattern.
- 2. a kind of deep drawing mould that can't flange edge die according to claim 1 is characterized in that: described die (10), the appearance profile shape of die (10) and appearance and size and drawing part expansion shape and consistent size.
- 3. a kind of deep drawing mould that can't flange edge die according to claim 1, it is characterized in that: described die (10), when pull and stretch rule drawing part, the i.e. drawing part of the revolving body floor projection size of representing with a diameter parameters, the expansion profile and the consistent size of pull and stretch die profile and size and regular shape drawing part, the die profile radius in the cupping tool equal the die edge to the die cavity radical length and along all transition.
- 4. a kind of deep drawing mould that can't flange edge die according to claim 1, it is characterized in that: described die (10), when the erose drawing part of pull and stretch floor projection, the i.e. drawing part of the floor projection shape that can not represent with a parameter, the expansion profile and the consistent size of pull and stretch die profile and size and erose drawing part, die profile radius in the cupping tool equals the die edge to the die cavity radical length, the die edge shape is irregular, the die edge is unequal to the die cavity radical length, so the die profile radius along week is inconsistent, but between each die profile radius in week, want rounding off.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201668975U CN201283396Y (en) | 2008-10-23 | 2008-10-23 | Deep-drawing mold of concave die without flange edge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201668975U CN201283396Y (en) | 2008-10-23 | 2008-10-23 | Deep-drawing mold of concave die without flange edge |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201283396Y true CN201283396Y (en) | 2009-08-05 |
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ID=40948381
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008201668975U Expired - Lifetime CN201283396Y (en) | 2008-10-23 | 2008-10-23 | Deep-drawing mold of concave die without flange edge |
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| Country | Link |
|---|---|
| CN (1) | CN201283396Y (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102514040A (en) * | 2011-12-13 | 2012-06-27 | 深圳华瀚新能源材料有限公司 | Method for forming lamp PET (Polyethylene Terephthalate) reflection part |
| CN103111521A (en) * | 2013-02-06 | 2013-05-22 | 宁波五谷金属制品有限公司 | Drawing die of rectangular container and drawing method |
| CN103658489A (en) * | 2013-12-09 | 2014-03-26 | 盐城工学院 | Cup shell forging device with guide function and material discharging function |
| CN104114296A (en) * | 2013-01-09 | 2014-10-22 | 新日铁住金株式会社 | Press-forming method |
| CN104289591A (en) * | 2014-09-29 | 2015-01-21 | 佛山市康思达液压机械有限公司 | Hydraulic device for aluminum alloy drawing and extrusion compound forming |
| CN104289592A (en) * | 2014-09-29 | 2015-01-21 | 佛山市康思达液压机械有限公司 | Aluminum alloy drawing and extruding compound technology |
| CN105215198A (en) * | 2015-11-16 | 2016-01-06 | 重庆持恒模具有限公司 | Stretching die |
| CN105618583A (en) * | 2016-02-02 | 2016-06-01 | 苏州宝成汽车冲压有限公司 | Drawing concave die and method for drawing gear shift shaft sleeve through drawing concave die |
| CN107962117A (en) * | 2017-12-01 | 2018-04-27 | 王冬冬 | A kind of drawing mode structure |
| CN111928993A (en) * | 2020-07-29 | 2020-11-13 | 广州华工环源绿色包装技术股份有限公司 | Pressure measuring device for pressure mechanism |
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2008
- 2008-10-23 CN CNU2008201668975U patent/CN201283396Y/en not_active Expired - Lifetime
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102514040A (en) * | 2011-12-13 | 2012-06-27 | 深圳华瀚新能源材料有限公司 | Method for forming lamp PET (Polyethylene Terephthalate) reflection part |
| CN104114296A (en) * | 2013-01-09 | 2014-10-22 | 新日铁住金株式会社 | Press-forming method |
| CN104114296B (en) * | 2013-01-09 | 2016-01-27 | 新日铁住金株式会社 | Impact forming method |
| CN103111521A (en) * | 2013-02-06 | 2013-05-22 | 宁波五谷金属制品有限公司 | Drawing die of rectangular container and drawing method |
| CN103111521B (en) * | 2013-02-06 | 2014-11-05 | 宁波五谷金属制品有限公司 | Drawing die of rectangular container and drawing method |
| CN103658489A (en) * | 2013-12-09 | 2014-03-26 | 盐城工学院 | Cup shell forging device with guide function and material discharging function |
| CN104289591A (en) * | 2014-09-29 | 2015-01-21 | 佛山市康思达液压机械有限公司 | Hydraulic device for aluminum alloy drawing and extrusion compound forming |
| CN104289592A (en) * | 2014-09-29 | 2015-01-21 | 佛山市康思达液压机械有限公司 | Aluminum alloy drawing and extruding compound technology |
| CN105215198A (en) * | 2015-11-16 | 2016-01-06 | 重庆持恒模具有限公司 | Stretching die |
| CN105618583A (en) * | 2016-02-02 | 2016-06-01 | 苏州宝成汽车冲压有限公司 | Drawing concave die and method for drawing gear shift shaft sleeve through drawing concave die |
| CN107962117A (en) * | 2017-12-01 | 2018-04-27 | 王冬冬 | A kind of drawing mode structure |
| CN111928993A (en) * | 2020-07-29 | 2020-11-13 | 广州华工环源绿色包装技术股份有限公司 | Pressure measuring device for pressure mechanism |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20090805 Effective date of abandoning: 20081023 |