CN110253721A - A kind of processing method of unsymmetric structure ceramic honey comb, mold and mold - Google Patents
A kind of processing method of unsymmetric structure ceramic honey comb, mold and mold Download PDFInfo
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- CN110253721A CN110253721A CN201910593624.1A CN201910593624A CN110253721A CN 110253721 A CN110253721 A CN 110253721A CN 201910593624 A CN201910593624 A CN 201910593624A CN 110253721 A CN110253721 A CN 110253721A
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- 241000264877 Hippospongia communis Species 0.000 title claims abstract description 56
- 239000000919 ceramic Substances 0.000 title claims abstract description 56
- 238000003672 processing method Methods 0.000 title claims description 9
- 238000012545 processing Methods 0.000 claims description 22
- 238000000034 method Methods 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 10
- 238000000227 grinding Methods 0.000 claims description 6
- 230000000295 complement effect Effects 0.000 claims description 5
- 238000009760 electrical discharge machining Methods 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 210000003660 reticulum Anatomy 0.000 abstract description 44
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 239000004071 soot Substances 0.000 abstract description 4
- 230000008901 benefit Effects 0.000 abstract description 2
- 239000002956 ash Substances 0.000 description 7
- 238000005553 drilling Methods 0.000 description 6
- 230000008676 import Effects 0.000 description 6
- 239000006229 carbon black Substances 0.000 description 5
- 235000019241 carbon black Nutrition 0.000 description 5
- 238000004080 punching Methods 0.000 description 5
- 238000000605 extraction Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910001315 Tool steel Inorganic materials 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000013618 particulate matter Substances 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
- 235000002918 Fraxinus excelsior Nutrition 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 201000003373 familial cold autoinflammatory syndrome 3 Diseases 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/14—Other self-supporting filtering material ; Other filtering material
- B01D39/20—Other self-supporting filtering material ; Other filtering material of inorganic material, e.g. asbestos paper, metallic filtering material of non-woven wires
- B01D39/2068—Other inorganic materials, e.g. ceramics
- B01D39/2093—Ceramic foam
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
- B23P15/24—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass dies
- B23P15/243—Honeycomb dies
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
- B28B3/20—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein the material is extruded
- B28B3/26—Extrusion dies
- B28B3/269—For multi-channeled structures, e.g. honeycomb structures
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Manufacturing & Machinery (AREA)
- Press-Shaping Or Shaping Using Conveyers (AREA)
Abstract
The invention discloses a kind of unsymmetric structure ceramic honey combs, belong to ceramic honey comb technical field, intake channel and exit passageway are alternately equipped on the ceramic honey comb, the section of the intake channel and exit passageway is square, the area of section of the intake channel is greater than the area of section of the exit passageway, its advantage is that intake channel soot capacity is big, when being fabricated to wall-flow honeycomb ceramic filter, it can effectively reduce later period pressure drop and extend the service life.The invention also discloses the manufacturing methods of a kind of unsymmetric structure ceramic honey comb and mold.
Description
Technical field
The present invention relates to ceramic honey comb technical field, in particular to a kind of unsymmetric structure ceramic honey comb, mold and mold
Processing method.
Background technique
Ceramic honey comb wall-flow filter can remove the carbon black in gasoline engine and diesel engine vent gas.Filtering traditional at present
Device design, it have import ceramic honey comb face and outlet ceramic honey comb face as inlet and outlet, and will import and export separate it is more
Hole wall.Filter is divided into intake channel (referred to as: I) and exit passageway (referred to as: O) by these walls interconnected.To capture
The outlet end of carbon black and ash, intake channel is blocked, and the import of exit passageway is blocked.It is such alternately block structure as
The chessboard of chess.This design can force tail gas to pass through from porous wall, so that particulate matter is deposited in channel or on wall.
In general, inlet and outlet channel has the square section of same area.When amount of carbon blacks reaches a certain level, regenerative process occurs, meeting
These carbon blacks of burning-off.
In the application, it is again seen that ash can be also deposited in intake channel.The particle of these ashes, by metal oxide, sulphur
Hydrochlorate, phosphate and other material compositions, they will not burn, thus will not in regenerative process burning-off.Therefore, these grey meetings
It is deposited in intake channel always, until mechanically being cleaned out.So before ash is cleaned out, with engine
Runing time increase, the ash in ceramic honey comb intake channel is more and more, and the back pressure of entire exhaust treatment system can be apparent
Ground increases.
Currently, a kind of method for reducing influence of the ash to back pressure is the area for increasing intake channel.For identical section
Product, this means that the area for reducing exit passageway.In this way, more particles can be accommodated in the intake channel of increase
Object (carbon black and ash), that is to say, that the ability of filter storage particulate matter is improved, to reduce back pressure.In some skies
Between in limited design, this structure is extremely important to the help of small filter.In the case where filtration pore is constant, import
The increase in channel will lead to distance between the angle of two adjacent intake channels and become smaller.After this distance becomes smaller, the mechanics of filter is strong
Degree can weaken, to lead to the problem of in production and application a series of.
Summary of the invention
The present invention provides a kind of unsymmetric structure ceramic honey combs, its advantage is that intake channel soot capacity is big, are making
When at wall-flow honeycomb ceramic filter, it can effectively reduce later period pressure drop and extend the service life.
Above-mentioned purpose of the invention is achieved through the following technical solutions, a kind of unsymmetric structure ceramic honey comb, described
Replace on ceramic honey comb and be equipped with intake channel and exit passageway, the section of the intake channel and exit passageway is square, institute
The area of section for stating intake channel is greater than the area of section of the exit passageway.
The present invention is further arranged to, and the cross-section area ratio range of the intake channel and the exit passageway is 1.2-
2.25。
The present invention is further arranged to, and the four corners of the intake channel are equipped with fillet or oblique angle.
On the other hand, the present invention provides a kind of unsymmetric structure ceramic honey comb mold, for processing above-mentioned unsymmetrical knot
Structure ceramic honey comb, including platform, the side of platform are equipped with equally distributed several feed openings, and the other side of the platform is alternately set
There are several big square columns and small square column, the big square column is complementary with intake channel shape, and the small square column and exit passageway shape are mutual
It mends, it is blow tank that the feed opening, which is connected to the gap between big square column and small square column,.
The present invention is further arranged to, the section of the feed opening be the round and described feed opening center with it is adjacent two-by-two
Big square column be overlapped with the diagonal line center of small square column.
In another aspect, the present invention provides a kind of processing method of unsymmetric structure ceramic honey comb mold, for processing
State unsymmetric structure ceramic honey comb mold, comprising the following steps:
S1: mold steel blank is selected to process circular die blank by mach mode；
S2: feed opening is processed in the side of circular die blank by way of numerical control processing；
S3: feed opening is polished to obtain deep hole mold green body；
S4: tooth platform is processed in circular die blank by way of turnery processing and obtains the deep hole mold green body with tooth platform；
S5: the deep hole mold green body with tooth platform that step S4 is obtained is cleaned, dries and is heat-treated again；
S6: the grinding of tow sides is carried out to the deep hole mold with tooth platform that step S5 is obtained；
S7: blow tank is gone out by electrical discharge machining and is extremely communicated with feed opening；
S8: the mold processed is cleaned and is debugged.
The present invention is further arranged to, and the step S7 further includes one electrode of setting, and the electrode is for passing through electrical fire
Flower processes blow tank, and shape and the blow tank of the electrode match.
The present invention is further arranged to, and further includes the outer rim processing location hole in circular die blank in the step S2,
The outer rim of the electrode is equipped with corresponding electrode location hole.
In conclusion the beneficial effects of the present invention are as follows:
1. the ceramic honey comb in the present invention when being fabricated to wall-flow honeycomb ceramic filter, leads to since intake channel is greater than outlet
Road improves intake channel soot capacity, reduces later period back pressure and extends the service life, while in intake channel setting fillet or tiltedly
Angle, alleviate because increase intake channel sectional area and caused by intensity decline problem；
2. the mold can be used for processing unsymmetric structure ceramic honey comb in the unsymmetric structure ceramic honey comb mold in the present invention
On extruder process unsymmetric structure honeycomb pottery, simple process, high production efficiency, unsymmetric structure ceramic honey comb mold into
Expect that hole is used for into mud, blow tank is used for mud extraction, and moulded pottery not yet put in a kiln to bake is i.e. formable after blow tank extrusion；
3. the processing method of the unsymmetric structure ceramic honey comb mold in the present invention, goes out blow tank using electrical discharge machining, processing
Precision is high.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of unsymmetric structure ceramic honey comb in the embodiment of the present invention one；
Fig. 2 is the top view of unsymmetric structure ceramic honey comb mold in the embodiment of the present invention two；
Fig. 3 is the side cross-sectional view of unsymmetric structure ceramic honey comb mold in the embodiment of the present invention two；
Fig. 4 is the schematic diagram of circular die blank in the embodiment of the present invention three；
Fig. 5 is the top view of three medium-length hole mold green body of the embodiment of the present invention；
Fig. 6 is the side cross-sectional view of three medium-length hole mold green body of the embodiment of the present invention；
Fig. 7 is the side cross-sectional view of the deep hole mold green body in the embodiment of the present invention three with tooth platform；
Fig. 8 is the top view of electrode in the embodiment of the present invention three；
Fig. 9 is the side cross-sectional view of electrode in the embodiment of the present invention three；
Figure 10 is the grid surface schematic diagram of electrode in the embodiment of the present invention three；
Figure 11 is electrical spark working working hour, the depth of the grid surface of electrode and the deep hole mold green body with tooth platform in the embodiment of the present invention three
Hole is to its figure.
In figure, 1, intake channel；2, exit passageway；3, platform；4, feed opening；5, big square column；6, small square column；7, it discharges
Slot；8, location hole；9, electrode location hole.
Specific embodiment
The embodiment of the invention will now be described in detail with reference to the accompanying drawings.
Embodiment one: a kind of unsymmetric structure ceramic honey comb is alternately logical equipped with import on the ceramic honey comb with reference to Fig. 1
The section of road 1 and exit passageway 2, intake channel 1 and exit passageway 2 is square, and the area of section of the intake channel 1 is greater than
The cross-section area ratio range of the area of section of the exit passageway 2, intake channel 1 and exit passageway 2 is 1.2-2.25, preferably
, the cross-section area ratio of intake channel 1 and exit passageway 2 is 1.5.The corner of exit passageway 2 is right angle, in order to improve bee
The four corners of the intensity of nest ceramics, intake channel 1 are equipped with fillet, it is to be understood that equally may be configured as oblique angle at fillet.
In asymmetric wall-flow honeycomb ceramic filter, the intake channel 1 and exit passageway 2 of ceramic honey comb are alternately sealed
Stifled, exhaust gas enters in ceramic honey comb from intake channel 1, and the gap through ceramic honey comb enters the discharge of exit passageway 2, increases import
The sectional area in channel 1 improves 1 soot capacity of intake channel, reduces later period back pressure and extends the service life.
Embodiment two: a kind of unsymmetric structure ceramic honey comb, for processing unsymmetric structure ceramic honey comb, with reference to Fig. 2-figure
3, including platform 3, the side of platform 3 is equipped with equally distributed several feed openings 4, the side of 3 feed opening 4 of platform be into mud face,
Feed opening 4 is used for into mud, and the other side of the platform 3 is alternately equipped with several big square columns 5 and small square column 6, the big square column 5 with into
1 shape of mouth channel is complementary, and the small square column 6 is complementary with 2 shape of exit passageway, and the feed opening 4 is connected to big square column 5 and small side
Gap between column 6 is blow tank 7, and 3 blow tank of platform, 7 side is the mud extraction face of platform 3.In Fig. 2, block plaid is generous
Column, lattice are small square column, and the black grid between big square column 5 and small square column 6 is blow tank；In Fig. 3, big square column 5 and small
White space between square column 6 is blow tank 7, and the color of blow tank 7 is different in Fig. 2 and Fig. 3, is illustrated herein.
Further, center and two-by-two adjacent big square column of the section of the feed opening 4 for the round and described feed opening 4
5 are overlapped with the diagonal line center of small square column 6 and (can refer to Figure 11 herein).
The moulded pottery not yet put in a kiln to bake for manufacturing ceramic honey comb enters from feed opening 4 and from 7 extrusion molding of blow tank, and it is non-right that consolidation is completed after firing
Claim the processing of ceramic honey comb.
Embodiment three: a kind of processing method of unsymmetric structure ceramic honey comb mold, for processing above-mentioned unsymmetric structure
Ceramic honey comb mold, comprising the following steps:
S1: mold steel blank is selected to process circular die blank by mach mode；Specifically, according to be processed
The size of mold produces the circular die blank of diameter (D), height (H) with high-quality mould steel blank on lathe and grinding machine,
Circular die blank refers to Fig. 4.It is understood that circular die blank can also equally be processed by other equipment,
It is not limited only to lathe and grinding machine.
S2: feed opening is processed in the side of circular die blank by way of numerical control processing；Specifically, according to being wanted
Mesh number, diameter (specifications and models) and the raw material shrinkage rates of the mold of processing are programmed on horizontal digital-control deep hole drilling machine,
Set punching range, the programs such as pitch of holes, drilling depth, time in equally distributed die feeding hole.By circular die base
Material, which is fixed on horizontal digital-control depth drill datum level, carries out drilling operation, carries out centre drill spot hole according to the program set first
Positioning operation, and set location hole, it is ensured that the precision of next step drilling operation.Mesh number and inputiing mud volume selection further according to product
The hollow long handle alloy tool steel bit of suitable diameter carries out drilling operation, when hollow long handle alloy tool steel bit punches center have it is cooling,
The oil that outflow of lubrication oil reduces the temperature that punching generates, while flowing out can take away the disintegrating slag iron filings that drilling generates, it is ensured that
The precision and efficiency of punching.
S3: feed opening is polished to obtain deep hole mold green body；The throwing of 45 degree of angles of front end band is replaced after punching
Drill finish successively carries out polishing operation to deep hole, it is ensured that the finish of deep hole is just can guarantee in this way into the uniformity of mud and consistent
Property, deep hole mold green body is obtained, deep hole mold green body is as seen in figs. 5-6.
S4: tooth platform is processed on circular die blank by way of turnery processing and obtains the deep hole mold base with tooth platform
Body；The mud extraction face of circular die blank is got on the bus molding jig tooth according to punching range (d) and mold tooth high (h) in numerically controlled lathe
Platform, tooth platform height are generally 4.5mm, and mold tooth platform height will obtain the deep hole mold base with tooth platform beyond charging bottom outlet 0.6mm or so
Body (as shown in Figure 7)
S5: the deep hole mold green body with tooth platform that step S4 is obtained is cleaned, dries and is heat-treated again；
S6: the grinding of tow sides is carried out to the deep hole mold green body with tooth platform that step S5 is obtained；After heat treatment
Deep hole mold green body with tooth platform carries out grinding by high precision face grinder, to tow sides, eliminates heat treatment and brings
Micro- deformation.
S7: blow tank is gone out by electrical discharge machining and is extremely communicated with feed opening；According to the hole of the deep hole mold green body with tooth platform
The volumetric ratio of the wall thickness of spacing and produced product, air inlet/outlet, determine asymmetric wall-flow diesel grain catcher into
Then the size of venthole selects the good electrode material of electric conductivity, the electrode with circular die blank diameter size is made
Module produces electrode that big aperture is separately distributed by being programmed in come (such as Fig. 8-9), wherein macropore on electrode processing machine
For with the square square hole for being less than fillet R0.15, aperture is square square hole (such as Figure 10), high 6mm of electrode wall or so, electrode
Wall thickness is less than product wall thickness 0.08mm, and there are the discharging gaps in process.Using high precision electro spark machine tool, utilize
The electrode module processed carries out spark discharge and processes the spaced square hole of asymmetric blow tank 7(size), processing
When electrode module grid surface is opposite with the deep hole mold green body tooth table top with tooth platform, in order to guarantee deep hole mold green body tooth table top
With the position of electrode, deep hole mold green body outer rim processing location hole 8(refer to Fig. 5 and Fig. 6), electrode outer rim be equipped with
Corresponding electrode location hole 9(refer to Fig. 8 and Fig. 9), when processing, be inserted into location hole 8 and electrode location hole 9 using pin
Realize the positioning of deep hole mold green body tooth table top and electrode.Four location holes of pole module and deep hole mold green body four with tooth platform
Fixed hole is corresponding, it is ensured that the diagonal line center in each feed opening center and mold mud outlet end adjacent four hole two-by-two is corresponding, such as
Shown in Figure 11, circular dashed line indicates the feed opening on deep hole mold green body in figure.Usually because in process export license 1 pay mould
Tool, which completes the process, needs 3 ~ 4 pairs of electrodes, to ensure that working depth reaches 4.5mm, such die feeding hole ability in electro-discharge machining
It is communicated with grid, forms asymmetric ceramic honey comb mold
S8: the mold processed is cleaned and is debugged.Finally the asymmetric ceramic honey comb mold clean added is done
Only (general to impregnate 24 hours in the oil, to degrease, then rinsed well with giant), prepares die sleeve, mounted in molding pressure
Die debugging is carried out on machine, until mold mud extraction is uniform, smooth, grid is without disconnection defect, such mold be can be carried out
Production operation.
What has been described above is only a preferred embodiment of the present invention, it is noted that for those of ordinary skill in the art
For, without departing from the concept of the premise of the invention, various modifications and improvements can be made, these belong to the present invention
Protection scope.
Claims (8)
1. a kind of unsymmetric structure ceramic honey comb, which is characterized in that be alternately equipped with intake channel (1) on the ceramic honey comb and go out
The section of mouth channel (2), the intake channel (1) and exit passageway (2) is square, the section face of the intake channel (1)
Product is greater than the area of section of the exit passageway (2).
2. unsymmetric structure ceramic honey comb according to claim 1, which is characterized in that the intake channel (1) with it is described
The cross-section area ratio range of exit passageway (2) is 1.2-2.25.
3. unsymmetric structure ceramic honey comb according to claim 1, which is characterized in that the quadrangle of the intake channel (1)
Place is equipped with fillet or oblique angle.
4. a kind of unsymmetric structure ceramic honey comb mold, for processing unsymmetric structure ceramic honey comb as claimed in claim 3,
Be characterized in that, including platform (3), the side of platform (3) is equipped with equally distributed several feed openings (4), the platform (3) it is another
Side is alternately equipped with several big square columns (5) and small square column (6), and the big square column (5) is complementary with intake channel (1) shape, described
Small square column (6) is complementary with exit passageway (2) shape, and the feed opening (4) is connected between big square column (5) and small square column (6)
Gap is blow tank (7).
5. unsymmetric structure ceramic honey comb mold according to claim 4, which is characterized in that the feed opening (4) is cut
Face is the center of the round and described feed opening (4) and the diagonal line center weight of big square column (5) adjacent two-by-two and small square column (6)
It closes.
6. a kind of processing method of unsymmetric structure ceramic honey comb mold, for processing unsymmetric structure described in claim 5
Ceramic honey comb mold, which comprises the following steps:
S1: mold steel blank is selected to process circular die blank by mach mode；
S2: feed opening (4) are processed in the side of circular die blank by way of numerical control processing；
S3: feed opening (4) is polished to obtain deep hole mold green body；
S4: tooth platform is processed in circular die blank by way of turnery processing and obtains the deep hole mold green body with tooth platform；
S5: the deep hole mold green body with tooth platform that step S4 is obtained is cleaned, dries and is heat-treated again；
S6: the grinding of tow sides is carried out to the deep hole mold with tooth platform that step S5 is obtained；
S7: blow tank (7) are gone out by electrical discharge machining and are extremely communicated with feed opening (4)；
S8: the mold processed is cleaned and is debugged.
7. the processing method of unsymmetric structure ceramic honey comb mold according to claim 6, which is characterized in that the step
S7 further includes one electrode of setting, the electrode for going out blow tank (7) by electrical discharge machining, the shape of the electrode with out
Hopper (7) matches.
8. the processing method of unsymmetric structure ceramic honey comb mold according to claim 6, which is characterized in that the step
It further include outer rim processing location hole (8) in circular die blank in S2, the outer rim of the electrode is equipped with corresponding electrode
Location hole (9).
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| CN111451732A (en) * | 2020-05-06 | 2020-07-28 | 宝利根（东莞）电子科技有限公司 | Integral combined machining process for parts |
| CN115229457A (en) * | 2022-09-19 | 2022-10-25 | 云南菲尔特环保科技股份有限公司 | Processing method of large and small hole honeycomb structure body extrusion die |
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