CN111810562A - Manufacturing process of neutral brake pad - Google Patents
Manufacturing process of neutral brake pad Download PDFInfo
- Publication number
- CN111810562A CN111810562A CN202010713399.3A CN202010713399A CN111810562A CN 111810562 A CN111810562 A CN 111810562A CN 202010713399 A CN202010713399 A CN 202010713399A CN 111810562 A CN111810562 A CN 111810562A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 16
- 230000007935 neutral effect Effects 0.000 title claims abstract description 15
- 238000003756 stirring Methods 0.000 claims abstract description 63
- 238000002156 mixing Methods 0.000 claims abstract description 35
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 30
- 239000010959 steel Substances 0.000 claims abstract description 30
- 238000000034 method Methods 0.000 claims abstract description 25
- 239000000463 material Substances 0.000 claims abstract description 19
- 239000000203 mixture Substances 0.000 claims abstract description 19
- 238000003825 pressing Methods 0.000 claims abstract description 8
- 239000002994 raw material Substances 0.000 claims abstract description 8
- 238000010438 heat treatment Methods 0.000 claims abstract description 7
- 239000000843 powder Substances 0.000 claims abstract description 5
- 238000002360 preparation method Methods 0.000 claims abstract description 4
- 238000005507 spraying Methods 0.000 claims description 14
- 238000005520 cutting process Methods 0.000 claims description 6
- 239000003292 glue Substances 0.000 claims description 6
- 241000357293 Leptobrama muelleri Species 0.000 claims description 5
- 238000002679 ablation Methods 0.000 claims description 3
- 239000000853 adhesive Substances 0.000 claims description 3
- 238000004026 adhesive bonding Methods 0.000 claims description 3
- 230000001070 adhesive effect Effects 0.000 claims description 3
- 239000011324 bead Substances 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 238000000227 grinding Methods 0.000 claims description 3
- 239000003973 paint Substances 0.000 claims description 3
- 238000005498 polishing Methods 0.000 claims description 3
- 238000007781 pre-processing Methods 0.000 claims description 3
- 238000005488 sandblasting Methods 0.000 claims description 3
- 238000000465 moulding Methods 0.000 claims 2
- 238000004140 cleaning Methods 0.000 claims 1
- 238000005260 corrosion Methods 0.000 claims 1
- 230000007797 corrosion Effects 0.000 claims 1
- 239000003112 inhibitor Substances 0.000 claims 1
- 239000011810 insulating material Substances 0.000 claims 1
- 230000003287 optical effect Effects 0.000 claims 1
- 239000002245 particle Substances 0.000 description 13
- 239000007787 solid Substances 0.000 description 13
- 239000007921 spray Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 239000012774 insulation material Substances 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D69/00—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
- F16D69/02—Composition of linings ; Methods of manufacturing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
- B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/20—Measuring; Control or regulation
- B01F35/21—Measuring
- B01F35/212—Measuring of the driving system data, e.g. torque, speed or power data
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D69/00—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
- F16D69/04—Attachment of linings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D69/00—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
- F16D69/04—Attachment of linings
- F16D2069/0425—Attachment methods or devices
- F16D2069/045—Bonding
- F16D2069/0466—Bonding chemical, e.g. using adhesives, vulcanising
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2200/00—Materials; Production methods therefor
- F16D2200/0082—Production methods therefor
- F16D2200/0086—Moulding materials together by application of heat and pressure
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Mechanical Engineering (AREA)
- Braking Arrangements (AREA)
Abstract
The invention discloses a production process of a neutral brake pad, which relates to the field of brake pad production and comprises the following steps: mixing raw material powder of a friction block according to a certain proportion, putting the raw material powder into equipment to form a mixture, starting a stirring device to stir the mixture, continuously and intermittently acquiring the angular velocity omega of a stirring shaftiSolving for the nearest I of said angular velocities ωiAnd (4) judging that the mixture is uniformly stirred in response to the fluctuation value B being smaller than a fluctuation threshold value, performing a high-temperature heavy pressing forming step, otherwise, continuously measuring and solving, and sequentially performing steel backing preparation, hot press forming, heat treatment and subsequent processing after the high-temperature heavy pressing forming step. The invention can effectively judge the mixing condition of the mixed materials and avoid the traditional stirringThe stirring process adopts fixed and long stirring time, so that the problems of overlong stirring time and increased stirring capacity are caused; meanwhile, the mixing uniformity can be effectively represented, and the influence on the subsequent process and the performance of the brake pad due to uneven mixing is avoided.
Description
Technical Field
The invention relates to the field of brake pad production, in particular to a manufacturing process of a neutral brake pad.
Background
The brake pad is also called brake shoe, is the most key safety part of an automobile brake system, and plays a decisive role in the brake effect, so the well-spoken brake pad is the protection spirit of people and automobiles.
The brake pad is generally composed of a back plate, a bonding heat insulation layer and a friction block. When braking, the brake disc or the brake drum is pressed to generate friction, so that the aim of decelerating and braking the vehicle is fulfilled. Due to the friction, the pads are gradually worn out, so that the braking effect is achieved in a wear-out manner.
In the prior art, the uniformity of the mixture for manufacturing the friction block cannot be accurately judged, if the mixing time is not enough, the mixing is not uniform, the manufactured friction block has low yield and poor quality, and if the mixing time is too long, the energy and time waste can be caused.
Disclosure of Invention
In view of some of the above-mentioned defects in the prior art, the technical problem to be solved by the present invention is the problem of energy waste and low quality yield caused by the inability to accurately judge the uniformity of the mixture.
In order to achieve the aim, the invention provides a production process of a neutral brake pad, which comprises the following steps:
step S1, mixing the raw material powder of the friction block according to a certain proportion, putting the mixture into equipment to form a mixture, and starting a stirring device to stir the mixture; the stirring device comprises: the stirring shaft is connected with a driving shaft of the rotating motor;
step S2, continuously and intermittently acquiring the angular velocity omega of the stirring shaftiSolving for the nearest I of said angular velocities ωiIn response to the fluctuation value B being smaller than the fluctuation threshold value, judging that the mixture is uniformly stirred, and executing the step S3, otherwise, continuing to execute the step S2; wherein i is the angular velocity ωiI, ω ═ 0,1,20The larger the number i is, the older the data is; the fluctuation value
The above-mentioned
The fluctuation threshold value is a preset value;
step S3, pouring the mixed raw materials into a mold, and then putting the mold into a forming machine for high-temperature heavy-pressure forming to prepare a friction block;
s4, cutting, stamping and flattening the prepared steel, and then carrying out pre-processing before processing to prepare the required steel backing;
s5, placing the friction block and the steel backing through a hot press, gluing the steel backing, and sticking the friction block and the steel backing together through heat and pressure to obtain a rough blank of the brake pad;
s6, heating the brake pad rough blank through a heat treatment machine and then continuously processing the brake pad rough blank;
and step S7, subsequent processing, namely processing for removing burrs on the brake pad and preventing the brake pad from rusting, and the subsequent processing comprises grinding, cutting, spraying and the like.
In the technical scheme, the stirring rotating speed is detected in real time, and the mixing uniformity degree of the solid particle materials is represented according to the change condition of the rotating speed, namely, when the fluctuation of the rotating speed of the stirring motor is large, the mixing of the solid particles is relatively non-uniform, and when the rotating speed of the stirring motor is stable, the mixing of the solid particle materials is relatively uniform; by the method, the mixing condition of the mixed materials is effectively judged, and the problems that the stirring time is too long and the stirring can be increased due to the adoption of fixed and long stirring time in the traditional stirring process are solved; meanwhile, the mixing uniformity can be effectively represented, and the influence on the subsequent process and the performance of the brake pad due to uneven mixing is avoided.
In a specific embodiment, the acquisition of the angular velocity is performed by a photoelectric encoder disposed on the stirring shaft.
In a specific embodiment, in the steel back preparation step, the steel is required to be processed to a required size and then washed clean, bead peening is performed first, then polishing is performed, sand blasting is performed on the surface of the steel, then primary glue spraying and drying are performed on the steel, and finally secondary glue spraying is performed.
In a specific embodiment, in the step of hot press forming, the stacked materials include the friction block, the heat insulation material, the anaerobic adhesive and the steel backing from top to bottom in sequence.
In a specific embodiment, the hot press sets a pressing temperature of 170 ℃, a pressing pressure of 20MPa, and a dwell time of 6 min.
In a specific embodiment, in the subsequent processing step, the spraying operation is to firstly spray the baking-free etchant and then spray the anti-rust paint on the exposed part of the steel back of the brake pad instead of the traditional ablation method.
In one embodiment, the method comprises
Replacing the steps as follows:
beta is more than 0.9 and less than 1, and beta is a weighting coefficient.
In the technical scheme, the mixture is more and more uniform along with the stirring; the closer the collected rotating speed data is, the more the current state of the rotating speed can be represented, so that the average value of the angular speed is solved
More recent data requires more weighted data, and so, pass
To solve the mean value of angular velocities, and
as a weighted value for solving the average of angular velocities so that more recent data gets higher weighting.
The invention has the beneficial effects that: according to the invention, the stirring rotating speed is detected in real time, and the mixing uniformity degree of the solid particle materials is represented according to the change condition of the rotating speed, namely, when the fluctuation of the rotating speed of the stirring motor is large, the mixing of the solid particles is relatively uneven, and when the rotating speed of the stirring motor is stable, the mixing of the solid particle materials is relatively even; by the method, the mixing condition of the mixed materials is effectively judged, and the problems that the stirring time is too long and the stirring can be increased due to the adoption of fixed and long stirring time in the traditional stirring process are solved; meanwhile, the mixing uniformity can be effectively represented, and the influence on the subsequent process and the performance of the brake pad due to uneven mixing is avoided. The uniformity of the mixture can be accurately judged by acquiring the angular speed of the stirring shaft to solve the fluctuation value of the angular speed, the utilization rate of energy and time can be effectively improved, and the quality and the yield of the manufactured brake pad are improved.
Drawings
FIG. 1 is a schematic flow chart of a process for manufacturing a neutral brake pad according to an embodiment of the present invention;
fig. 2 is a schematic view of a material mixing device of a neutral brake pad according to a specific embodiment of the invention.
Detailed Description
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
as shown in fig. 1 and 2, in the present invention, a manufacturing process of a neutral brake pad is provided, which is characterized by comprising the following steps:
step S1, mixing the raw material powder of the friction block according to a certain proportion, putting the mixture into equipment to form a mixture, and starting a stirring device to stir the mixture; the stirring device comprises: the stirring device comprises a rotating motor 1, a stirring shaft 2 and stirring wings 3 arranged on the stirring shaft, wherein the stirring shaft 2 is connected with a driving shaft of the rotating motor 1;
step S2, continuously and intermittently acquiring the angular velocity omega of the stirring shaftiSolving for the nearest I of said angular velocities ωiIn response to the fluctuation value B being smaller than the fluctuation threshold value, judging that the mixture is uniformly stirred, and executing the step S3, otherwise, continuing to execute the step S2; wherein i is the angular velocity ωiI, ω ═ 0,1,20The larger the number i is, the older the data is; the fluctuation value
The above-mentioned
The fluctuation threshold value is a preset value;
step S3, pouring the mixed raw materials into a mold, and then putting the mold into a forming machine for high-temperature heavy-pressure forming to prepare a friction block;
s4, cutting, stamping and flattening the prepared steel, and then carrying out pre-processing before processing to prepare the required steel backing;
s5, placing the friction block and the steel backing through a hot press, gluing the steel backing, and sticking the friction block and the steel backing together through heat and pressure to obtain a rough blank of the brake pad;
s6, heating the brake pad rough blank through a heat treatment machine and then continuously processing the brake pad rough blank;
and step S7, subsequent processing, namely processing for removing burrs on the brake pad and preventing the brake pad from rusting, and the subsequent processing comprises grinding, cutting, spraying and the like.
In the embodiment, the stirring rotating speed is detected in real time, and the mixing uniformity degree of the solid particle materials is represented according to the change condition of the rotating speed, namely, when the rotating speed of the stirring motor fluctuates greatly, the mixing of the solid particles is relatively uneven, and when the rotating speed of the stirring motor is stable, the mixing of the solid particle materials is relatively even; by the method, the mixing condition of the mixed materials is effectively judged, and the problems that the stirring time is too long and the stirring can be increased due to the adoption of fixed and long stirring time in the traditional stirring process are solved; meanwhile, the mixing uniformity can be effectively represented, and the influence on the subsequent process and the performance of the brake pad due to uneven mixing is avoided.
In a specific embodiment, the acquisition of the angular velocity is performed by a photoelectric encoder 4 arranged on the stirring shaft.
In a specific embodiment, in the steel back preparation step, the steel is required to be processed to a required size and then washed clean, bead peening is performed first, then polishing is performed, sand blasting is performed on the surface of the steel, then primary glue spraying and drying are performed on the steel, and finally secondary glue spraying is performed.
In a specific embodiment, in the step of hot press forming, the stacked materials include the friction block, the heat insulation material, the anaerobic adhesive and the steel backing from top to bottom in sequence.
In a specific embodiment, the hot press sets a pressing temperature of 170 ℃, a pressing pressure of 20MPa, and a dwell time of 6 min.
In a specific embodiment, in the subsequent processing step, the spraying operation is to firstly spray the baking-free etchant and then spray the anti-rust paint on the exposed part of the steel back of the brake pad instead of the traditional ablation method.
In one embodiment, the method comprises
Replacing the steps as follows:
beta is more than 0.9 and less than 1, and beta is a weighting coefficient.
In the process of material stirring, when solid particle materials are not uniformly mixed, the stirring resistance borne by the stirring device is large and small, and the fluctuation of the stirring speed is presented; in the embodiment, the stirring rotating speed is detected in real time, and the mixing uniformity degree of the solid particle materials is represented according to the change condition of the rotating speed, namely, when the rotating speed of the stirring motor fluctuates greatly, the mixing of the solid particles is relatively uneven, and when the rotating speed of the stirring motor is stable, the mixing of the solid particle materials is relatively even; by the method, the mixing condition of the mixed materials is effectively judged, and the problems that the stirring time is too long and the stirring can be increased due to the adoption of fixed and long stirring time in the traditional stirring process are solved; meanwhile, the mixing uniformity can be effectively represented, and the influence on the subsequent process and the performance of the brake pad due to uneven mixing is avoided.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (7)
1. The manufacturing process of the neutral brake pad is characterized by comprising the following steps:
step S1, mixing the raw material powder of the friction block according to a certain proportion, putting the mixture into equipment to form a mixture, and starting a stirring device to stir the mixture; the stirring device comprises: the stirring shaft is connected with a driving shaft of the rotating motor;
step S2, continuously and intermittently acquiring the angular velocity omega of the stirring shaftiSolving for the nearest I of said angular velocities ωiIn response to the fluctuation value B being smaller than the fluctuation threshold value, judging that the mixture is uniformly stirred, and executing the step S3, otherwise, continuing to execute the step S2; wherein i is the angular velocity ωiI-1, ω, 0,1,20The larger the number i is, the older the data is; the fluctuation value
The above-mentioned
The fluctuation threshold value is a preset value;
step S3, pouring the mixed raw materials into a mold, and then putting the mold into a forming machine for high-temperature heavy-pressure forming to prepare a friction block;
s4, cutting, stamping and flattening the prepared steel, and then carrying out pre-processing before processing to prepare the required steel backing;
s5, placing the friction block and the steel backing through a hot press, gluing the steel backing, and sticking the friction block and the steel backing together through heat and pressure to obtain a rough blank of the brake pad;
s6, heating the brake pad rough blank through a heat treatment machine and then continuously processing the brake pad rough blank;
and step S7, subsequent processing, namely processing for removing burrs on the brake pad and preventing the brake pad from rusting, and the subsequent processing comprises grinding, cutting, spraying and the like.
2. A process for manufacturing a neutral brake pad according to claim 1, wherein said angular velocity is acquired by means of an optical encoder disposed on said stirring shaft.
3. A process for manufacturing a neutral brake pad as claimed in claim 1, wherein the steel backing preparation step comprises cleaning the steel after processing the steel to a desired size, performing bead hardening treatment, polishing, performing sand blasting on the surface of the steel, performing primary glue spraying and drying on the steel, and performing secondary glue spraying.
4. The manufacturing process of a neutral brake pad according to claim 1, wherein the materials stacked in the hot press molding step are the friction block, the heat insulating material, the anaerobic adhesive and the steel backing in sequence from top to bottom.
5. The hot press molding step according to claim 3, wherein the hot press is set to a pressing temperature of 170 ℃, a pressing pressure of 20MPa, and a dwell time of 6 min.
6. The process for manufacturing a neutral brake pad as claimed in claim 1, wherein in the subsequent processing step, the spraying operation is carried out by spraying a baking-free corrosion inhibitor and then spraying a rust-proof paint on the exposed part of the steel back of the brake pad instead of the conventional ablation method.
7. A process for manufacturing a neutral brake pad according to claim 1, wherein said neutral brake pad is applied
Replacing the steps as follows:
beta is more than 0.9 and less than 1, and beta is a weighting coefficient.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010713399.3A CN111810562B (en) | 2020-07-22 | 2020-07-22 | Manufacturing process of neutral brake pad |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010713399.3A CN111810562B (en) | 2020-07-22 | 2020-07-22 | Manufacturing process of neutral brake pad |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111810562A true CN111810562A (en) | 2020-10-23 |
| CN111810562B CN111810562B (en) | 2024-06-07 |
Family
ID=72862192
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010713399.3A Active CN111810562B (en) | 2020-07-22 | 2020-07-22 | Manufacturing process of neutral brake pad |
Country Status (1)
| Country | Link |
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| CN (1) | CN111810562B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112959067A (en) * | 2021-03-25 | 2021-06-15 | 杭州优纳摩擦材料有限公司 | Brake pad steel backing production line and brake pad steel backing production method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB319449A (en) * | 1928-07-27 | 1929-09-26 | John Hogg Robertson | Improvements in the manufacture of clutch facings and similar frictional materials |
| JPH08113658A (en) * | 1994-10-14 | 1996-05-07 | Nichias Corp | Friction material for braking device and its production |
| CN102927180A (en) * | 2012-03-28 | 2013-02-13 | 安徽省中力车辆制动系统制造有限公司 | Less-metal brake pad and production process thereof |
| CN105041929A (en) * | 2015-07-31 | 2015-11-11 | 安徽省中力车辆制动系统制造有限公司 | Non-asbestos metal-free ceramic brake and manufacturing technique thereof |
| US20190120314A1 (en) * | 2016-06-01 | 2019-04-25 | Jiangsu Jinmaisui New Energy Technology Co,, Ltd. | Production Technology of Friction Material for Brake Pad of Construction Waste Filling Material |
-
2020
- 2020-07-22 CN CN202010713399.3A patent/CN111810562B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB319449A (en) * | 1928-07-27 | 1929-09-26 | John Hogg Robertson | Improvements in the manufacture of clutch facings and similar frictional materials |
| JPH08113658A (en) * | 1994-10-14 | 1996-05-07 | Nichias Corp | Friction material for braking device and its production |
| CN102927180A (en) * | 2012-03-28 | 2013-02-13 | 安徽省中力车辆制动系统制造有限公司 | Less-metal brake pad and production process thereof |
| CN105041929A (en) * | 2015-07-31 | 2015-11-11 | 安徽省中力车辆制动系统制造有限公司 | Non-asbestos metal-free ceramic brake and manufacturing technique thereof |
| US20190120314A1 (en) * | 2016-06-01 | 2019-04-25 | Jiangsu Jinmaisui New Energy Technology Co,, Ltd. | Production Technology of Friction Material for Brake Pad of Construction Waste Filling Material |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112959067A (en) * | 2021-03-25 | 2021-06-15 | 杭州优纳摩擦材料有限公司 | Brake pad steel backing production line and brake pad steel backing production method |
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| Publication number | Publication date |
|---|---|
| CN111810562B (en) | 2024-06-07 |
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