AU2019442805A1 - Cutting pick for coal cutter and machining method therefor - Google Patents
Cutting pick for coal cutter and machining method therefor Download PDFInfo
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- AU2019442805A1 AU2019442805A1 AU2019442805A AU2019442805A AU2019442805A1 AU 2019442805 A1 AU2019442805 A1 AU 2019442805A1 AU 2019442805 A AU2019442805 A AU 2019442805A AU 2019442805 A AU2019442805 A AU 2019442805A AU 2019442805 A1 AU2019442805 A1 AU 2019442805A1
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- saponifying
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- 238000005520 cutting process Methods 0.000 title claims abstract description 87
- 238000000034 method Methods 0.000 title claims abstract description 38
- 239000003245 coal Substances 0.000 title claims abstract description 37
- 238000003754 machining Methods 0.000 title claims abstract description 26
- 238000004140 cleaning Methods 0.000 claims abstract description 50
- 238000001816 cooling Methods 0.000 claims abstract description 43
- 238000000641 cold extrusion Methods 0.000 claims abstract description 25
- 238000000137 annealing Methods 0.000 claims abstract description 19
- 238000005422 blasting Methods 0.000 claims abstract description 15
- 238000002485 combustion reaction Methods 0.000 claims abstract description 14
- 230000003647 oxidation Effects 0.000 claims abstract description 11
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 11
- 238000005498 polishing Methods 0.000 claims abstract description 5
- 239000002253 acid Substances 0.000 claims description 31
- 239000002893 slag Substances 0.000 claims description 29
- 238000011068 loading method Methods 0.000 claims description 18
- 238000004062 sedimentation Methods 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 12
- 229910000831 Steel Inorganic materials 0.000 claims description 11
- 239000012528 membrane Substances 0.000 claims description 11
- 239000010959 steel Substances 0.000 claims description 11
- 238000005096 rolling process Methods 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 230000004048 modification Effects 0.000 claims description 9
- 238000012986 modification Methods 0.000 claims description 9
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 8
- 238000003723 Smelting Methods 0.000 claims description 5
- 239000007921 spray Substances 0.000 claims description 5
- 229910052786 argon Inorganic materials 0.000 claims description 4
- 239000010419 fine particle Substances 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- 238000001125 extrusion Methods 0.000 claims description 3
- 230000007704 transition Effects 0.000 claims description 3
- 238000007514 turning Methods 0.000 claims description 3
- 238000001354 calcination Methods 0.000 claims description 2
- 238000003825 pressing Methods 0.000 claims description 2
- 238000005507 spraying Methods 0.000 claims description 2
- 238000007127 saponification reaction Methods 0.000 abstract description 9
- 238000011109 contamination Methods 0.000 abstract description 6
- 230000002378 acidificating effect Effects 0.000 abstract description 2
- BHEPBYXIRTUNPN-UHFFFAOYSA-N hydridophosphorus(.) (triplet) Chemical compound [PH] BHEPBYXIRTUNPN-UHFFFAOYSA-N 0.000 abstract 2
- 239000003921 oil Substances 0.000 description 22
- 239000010410 layer Substances 0.000 description 19
- 229910001566 austenite Inorganic materials 0.000 description 8
- 230000000694 effects Effects 0.000 description 8
- 238000012545 processing Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 239000012535 impurity Substances 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- 150000002500 ions Chemical class 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 238000005260 corrosion Methods 0.000 description 4
- 229910001562 pearlite Inorganic materials 0.000 description 4
- 230000035515 penetration Effects 0.000 description 4
- 229910019142 PO4 Inorganic materials 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 239000012466 permeate Substances 0.000 description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 3
- 239000010452 phosphate Substances 0.000 description 3
- 238000004506 ultrasonic cleaning Methods 0.000 description 3
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 229910001567 cementite Inorganic materials 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 2
- 235000014113 dietary fatty acids Nutrition 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229930195729 fatty acid Natural products 0.000 description 2
- 239000000194 fatty acid Substances 0.000 description 2
- 150000004665 fatty acids Chemical class 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 2
- 230000001050 lubricating effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910021645 metal ion Inorganic materials 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- 239000011701 zinc Substances 0.000 description 2
- LRXTYHSAJDENHV-UHFFFAOYSA-H zinc phosphate Chemical compound [Zn+2].[Zn+2].[Zn+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O LRXTYHSAJDENHV-UHFFFAOYSA-H 0.000 description 2
- 229910000165 zinc phosphate Inorganic materials 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 229910000746 Structural steel Inorganic materials 0.000 description 1
- IHBCFWWEZXPPLG-UHFFFAOYSA-N [Ca].[Zn] Chemical class [Ca].[Zn] IHBCFWWEZXPPLG-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000007866 anti-wear additive Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- 230000009172 bursting Effects 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000005238 degreasing Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000011086 high cleaning Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910000398 iron phosphate Inorganic materials 0.000 description 1
- WBJZTOZJJYAKHQ-UHFFFAOYSA-K iron(3+) phosphate Chemical compound [Fe+3].[O-]P([O-])([O-])=O WBJZTOZJJYAKHQ-UHFFFAOYSA-K 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- QMQXDJATSGGYDR-UHFFFAOYSA-N methylidyneiron Chemical compound [C].[Fe] QMQXDJATSGGYDR-UHFFFAOYSA-N 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000010587 phase diagram Methods 0.000 description 1
- 230000037452 priming Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 150000004671 saturated fatty acids Chemical class 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 230000000638 stimulation Effects 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 230000007847 structural defect Effects 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/32—Soft annealing, e.g. spheroidising
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C35/00—Details of, or accessories for, machines for slitting or completely freeing the mineral from the seam, not provided for in groups E21C25/00 - E21C33/00, E21C37/00 or E21C39/00
- E21C35/18—Mining picks; Holders therefor
- E21C35/183—Mining picks; Holders therefor with inserts or layers of wear-resisting material
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mining & Mineral Resources (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Chemical Treatment Of Metals (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
- Turning (AREA)
Abstract
A cutting pick for a coal cutter and a machining method therefor. The cutting pick for a coal cutter comprises a connection shaft portion (1) and a cutting top cap (2), the connection shaft portion (1) and the cutting top cap (2) being integrally formed, and several internal recessed clamping grooves (3) being provided on an outer surface of the cutting top cap (2). The machining method for the cutting pick of a coal cutter comprises the following steps: blanking and burning; performing spheroidizing annealing, taking a workpiece out of a combustion chamber, and controlling the cooling speed of the workpiece; performing shot blasting and oxidation removal, polishing an oxide layer on the surface of the workpiece, and cleaning oil contamination on the surface of the workpiece; performing primary phosphorous saponification; performing primary cold extrusion; performing acidic cleaning; performing secondary phosphorous saponification; performing secondary cold extrusion; and performing cylindrical machining.
Description
Cross-Reference to Related Applications
The present disclosure claims the priority to Chinese Patent Application 201910323666.3, titled "CUTTING PICK FOR COAL CUTTER AND MACHINING METHOD THEREOF", filed with China National Intellectual Property Administration (CNIPA) on April 22, 2019, which is incorporated herein by reference in its entirety.
Technical Field
Embodiments of the present disclosure relate to the technical field of coal cutting consumable tools, in particular to a cutting pick for coal cutter and a machining method thereof.
Background
Concept cutting pick is one of the vulnerable parts in coal cutting and roadway driving machinery, and is the main tool for coal breaking and crushing. According to the imported and domestic cutting picks actually used in some coal mines in China, most of the materials of the pick body are 42CrMo and 35CrMnSi, and the newly developed domestic Si-Mn-Mo series meta-bainitic steel is used in some coal mines. There are various cutting picks. A general cutting pick structure includes a hard alloy pick head inlaid on a low-alloy structural steel pick body that has been quenched and tempered. The cutting pick bears high cyclic compressive stress, shear stress and impact load during work. The main failure modes of the cutting pick in use include falling off of the pick head, bursting of pick, and wear of the pick head and the pick body. Under certain working conditions, the failure of the cutting pick is often caused by the breaking of the pick body. The mechanical properties of the pick body directly affect the service life of the cutting pick. The reasonable material and effective heat treatment method of the pick body have positive significance for reducing the wear and breaking of the pick body, reducing the consumption of the coal cutter's picks, improving the operation rate of the coal cutter, and increasing the overall economic benefits of coal cutting production. In order to improve the wear resistance of the cutting pick, a process combining heat treatment and phosphating and saponification has been proposed. This process has a significant processing effect, and it is designed to maximize the smoothness, wear resistance, surface hardness and internal stress of the cutting pick so as to prolong the service life of the cutting pick. The existing heat treatment methods are mostly quenching, annealing or tempering, and the heating and cooling methods are varying. The general heat treatment method cannot fully match the processing technology and work of the cutting pick, and it is easy to cause a thick oxide layer and excessive oil stains on the surface of the workpiece, etc. It cannot be fully adapted to the cutting pick processing technology, which may cause waste of cleaning resources and affect the processing efficiency of the phosphating and saponification treatment. In addition, the existing phosphating treatment will inevitably generate phosphating slag. If the phosphating slag is not controlled and isolated, it will contaminate the phosphating solution and shorten the service life of the phosphating solution. Besides, the phosphating slag will also adhere to the surface of the workpiece to affect the quality and wear resistance effect of the phosphated film.
Summary
In view of this, the embodiments of the present disclosure provide a cutting pick for coal cutter and a machining method thereof. The present disclosure implements annealing treatment through isolated gas convection and hot water cooling and separates phosphating slag to avoid contact and mixing of a phosphated film with a precipitate. The present disclosure solves a series of problems caused by the annealing method in the prior art, such as large-area oxidation of the surface of the workpiece, a large amount of oil stains, time-consuming polishing and cleaning, high cleaning cost, large contamination, poor adhesion of the phosphated film and low wear resistance In order to achieve the above objective, the embodiments of the present disclosure provide the following technical solution. A cutting pick for coal cutter includes a connecting shaft portion and a cutting top cap, the connecting shaft portion and the cutting top cap are integrally molded; an outer surface of the cutting top cap is provided with a plurality of evenly distributed recessed catch grooves; a side section of each of the recessed catch grooves presents a triangular structure; an outer edge of each of the recessed catch grooves is provided with an externally-extended inclined surface. In a preferred embodiment of the present disclosure, a wear-resistant phosphated film layer and a wear-resistant saponified film layer may be provided on outer surfaces of the connecting shaft portion and the cutting top cap. In a preferred embodiment of the present disclosure, the connecting shaft portion may be smoothly connected with a size transition section of the cutting top cap. In addition, the present disclosure further designs a machining method of a cutting pick for coal cutter, which includes: step 100: feeding and smelting: putting workpieces together in a combustion chamber and heating slowly; step 200: spheroidizing annealing: taking each of the workpieces out of the combustion chamber, and cooling the workpiece at a controlled rate; step 300: shot blasting to remove oxidation: polishing an oxide layer on a surface of the workpiece by using a shot blasting machine, and cleaning an oil stain on the surface of the workpiece; step 400: primary phosphating and saponifying: putting the cleaned workpiece into a phosphating pool and a saponifying pool according to a procedure to plasticize the surface of the workpiece; step 500: primary cold extrusion: subjecting the workpiece plasticized by the primary phosphating and saponifying to primary cold extrusion modification; step 600: secondary phosphating and saponifying: putting the workpiece after the primary cold extrusion into the phosphating pool and the saponifying pool to carry out secondary plasticization of the surface of the primary workpiece; step 700: secondary cold extrusion: subjecting the workpiece plasticized by the secondary phosphating and saponifying to secondary cold extrusion modification; and step 800: outer circle machining: cooling the workpiece to room temperature, and machining an outer circle surface of the workpiece by a turning method to obtain a cutting pick.
In a preferred embodiment of the present disclosure, in step 200, the spheroidizing annealing specifically may include: step 201: continuously heating the workpiece in the combustion chamber to 735-740°C, and calcinating the steel workpiece of the cutting pick at this temperature for 20-30 min; step 202: transferring the workpiece from the combustion chamber to a vacuum cooling furnace for isolated cooling, feeding argon into the vacuum cooling furnace, and controlling the cooling rate of 2-30 C/s through air convection; step 203: spraying, after isolated cooling for 10-15 min, circulating cooling hot water to the workpiece in the vacuum cooling furnace to control the cooling rate of 5-1 0 °C/s; and step 204: taking the workpiece out from the vacuum cooling furnace when a surface temperature of the workpiece drops to room temperature. In a preferred embodiment of the present disclosure, in step 300, the cleaning an oil stain on the surface of the workpiece specifically may include: first, removing the oxide layer on the surface of the workpiece through the shot blasting machine, and removing a particle on the surface of the workpiece through a pulse air injecting port; second, putting the polished workpiece in an acid solution pool for rolling rubbing to clean up the oil stain and fine particle on the workpiece; and finally, taking the cleaned workpiece out of the acid solution pool, and carrying out secondary acid spray rinse through a nozzle on an upper end of the acid solution pool until the surface of the strengthened workpiece is free of any oil stain. In a preferred embodiment of the present disclosure, the rolling rubbing of the workpiece specifically may include: putting the workpiece on a lifting platform in the acid solution pool; providing a linear moving table on an edge of the acid solution pool, and providing a Z-shaped cleaning rod on the linear moving table through a bearing, the Z-shaped cleaning rod is rotatable under the support of the lifting platform; and providing a cleaning roller, for rubbing the workpiece, on the Z-shaped cleaning rod through a bearing. In a preferred embodiment of the present disclosure, before the secondary phosphating and saponifying in step 600, the workpiece after the first cold extrusion may be subjected to acid cleaning, so as to remove dirt adhering to the surface of the workpiece during the extrusion. In a preferred embodiment of the present disclosure, in step 400, the phosphating and saponifying may be specifically implemented as follows: step 401: adding a stage that is movable up and down at the bottom of the phosphating pool, providing a plurality of workpiece loading channels that are evenly and parallelly distributed on the stage, providing inclined sedimentation plates respectively on two sides of each of the workpiece loading channels, and combining the inclined sedimentation plates with the workpiece loading channel to form a conical inclined plate sedimentation tank; step 402: providing a frame-shaped support, which may stretch and contract up and down, on two sides of each of the workpiece loading channels, and providing a detachable semi-permeable filter membrane in the frame-shaped support; step 403: pressing the frame-shaped support down to contract, inserting the workpiece into a recessed catch groove on the workpiece loading channel, and lifting the frame-shaped support up to stretch to form a guardrail; step 404: providing an arc-shaped collection plate at the bottom of the conical inclined plate sedimentation tank, and collecting a phosphating slag in the arc-shaped collection plate in a centralized manner; and step 405: putting the phosphated workpiece in the saponifying pool for saponifying. In a preferred embodiment of the present disclosure, the phosphating pool and the saponifying pool may be shaken in up, down, left and right directions according to a frequency, such that the surface of the workpiece is evenly phosphated and an even phosphated film is formed. The embodiments of the present disclosure have the following advantages: (1) The present disclosure changes the internal structure and stress of the workpiece through the vacuum-isolated annealing treatment to ensure that the performance of the workpiece meets the requirements of the coal cutting process. In addition, the present disclosure utilizes the means of rare air-isolated convection and hot water controlled cooling to avoid oil stains and other impurities appearing on the surface of the workpiece and avoid oxidation of the surface of the workpiece, thereby reducing the workpiece cleaning cost and improving the adhesion of the film in the subsequent phosphating and saponifying. (2) The phosphating pool of the present disclosure can selectively control ion penetration, and isolate the workpiece from the phosphating slag, so as to avoid excessive phosphating slag contamination that shortens the service life of the phosphating solution, prevent the phosphating slag from approaching the surface of the workpiece to affect the quality of the phosphated film, and prevent the phosphating slag from destroying the density of the phosphated film, thereby improving the adhesion and corrosion resistance of the phosphated film.
Brief Description of the Drawings
To describe the technical solutions in the specific implementations of the present disclosure or in the prior art more clearly, the accompanying drawings required for describing the specific implementations or the prior art are briefly described below. Apparently, the accompanying drawings in the following description are merely illustrative, and those of ordinary skill in the art may still derive other accompanying drawings from these accompanying drawings without creative efforts. The structures, ratios and sizes shown in the specification are merely intended to match the content disclosed herein for the understanding and reading of those skilled in the art. They are not intended to limit the implementation conditions of the present disclosure, so they have no technical significance. Any modification to the structure, change in the proportional relationship or adjustment in the size should still fall within the scope of the technical content disclosed in the present disclosure without affecting the effects and objectives that can be achieved by the present disclosure. FIG. 1 is a view illustrating an overall structure of a cutting pick according to an implementation of the present disclosure. FIG. 2 is a flowchart of cutting pick processing according to an implementation of the present disclosure. Reference Numerals:
1. connecting shaft portion; 2. cutting top cap; and 3. recessed catch groove.
Detailed Description
The following specific embodiments illustrate the implementations of the present
disclosure. Those skilled in the art may easily understand other advantages and effects of the present disclosure from the content disclosed in the specification. Apparently, the described embodiments are part rather than all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present disclosure without creative efforts should fall within the protection scope of the present disclosure. Embodiment 1 As shown in FIG. 1, the present disclosure provides a cutting pick for coal cutter. The cutting pick includes a connecting shaft portion 1 and a cutting top cap 2. The connecting shaft portion 1 and the cutting top cap 2 are integrally molded. The connecting shaft portion 1 is smoothly connected with a size transition section of the cutting top cap 2. An outer surface of the cutting top cap 2 is provided with a plurality of evenly distributed recessed catch grooves 3. A side section of each of the recessed catch grooves 3 presents a triangular structure. An outer edge of each of the recessed catch grooves 3 is provided with an externally-extended inclined surface. A wear-resistant phosphated film layer and a wear-resistant saponified film layer are provided on outer surfaces of the connecting shaft portion 1 and the cutting top cap 2. The wear-resistant phosphated film layer and the wear-resistant saponified film layer are obtained by phosphating and saponifying a pick body. Through the phosphating and saponifying, the cutting pick can absorb a large amount of lubricating oil to reduce wear and improve the corrosion and wear resistance of the surface of the cutting pick. Embodiment 2 In order to obtain the above-mentioned cutting pick for coal cutter, the present disclosure further designs a machining method of the cutting pick for coal cutter, so as to obtain a wear-resistant phosphated film layer and a wear-resistant saponified film layer on the surface of the cutting pick. As shown in FIG. 2, the method mainly includes:
Step 100: Feeding and smelting: put workpieces together in a combustion chamber and heating slowly. Step 200: Spheroidizing annealing: take each of the workpieces out of the combustion chamber, and cooling the workpiece at a controlled rate. The above steps are heat treatment of the cutting pick workpiece. The spheroidizing annealing treatment is to slowly heat the metal to an austenite zone, hold for a sufficient time and cool at an appropriate rate. The spheroidizing annealing is described in detail below, which includes: Step 201: Continuously heat the workpiece in the combustion chamber to 735-740°C, and calcinate the steel workpiece of the cutting pick at this temperature for 20-30 min. This temperature range causes the steel to transform into austenite in the heating process. The grains of the austenitic steel are relatively fine, and the grain boundaries are irregularly curved. After 20-30 min of holding, the grains grow up, and the grain boundaries tend to be flattened. Step 202: Transfer the workpiece from the combustion chamber to a vacuum cooling furnace for isolated cooling, feed argon into the vacuum cooling furnace, and control the cooling rate of 2-30 C/s through air convection. Austenite is the most densely packed lattice structure with high density, so the volume mass of austenite is smaller than that of ferrite, martensite and other phases in steel. When steel is heated to the austenite zone, its volume shrinks. When cooled, the austenite transforms into ferrite-pearlite or other structure, and the volume expands, which is easy to cause an internal stress and deformation. In order to avoid deformation and expansion of the workpiece, the austenite needs to be slowly cooled. Therefore, the calcinated workpiece is cooled at a cooling rate of 2-30 C/s. In the vacuum cooling furnace, isolated cooling and argon convection cooling are performed so as to isolate the air, reduce the oxidation of the steel at high temperature, and ensure the rapid formation of the film in the phosphating and saponification. Step 203: Spray, after isolated cooling for 10-15 min, circulating cooling hot water to the workpiece in the vacuum cooling furnace to control the cooling rate of 5-10°C/s. Step 204: Take the workpiece out from the vacuum cooling furnace when the surface temperature of the workpiece drops to room temperature. The workpiece is continuously cooled by using hot water, which avoids an internal stress and deformation of the workpiece caused by cold stimulation, avoids the oxidation of the surface of the workpiece caused by dissolved oxygen in water, speeds up the cooling rate, and improves production efficiency. The cutting pick needs to withstand high cyclical compressive stress, shear stress and impact load when cutting coal. When the cutting pick cuts coal for a long time, the temperature of the cutting pick rises due to the impact of friction. To work under such a complex working condition, the cutting pick requires the pick body to have both wear resistance and desirable impact resistance. In the iron-carbon phase diagram, austenite is a high-temperature phase, which is formed by inverse eutectoid transformation of pearlite. The main function of spheroidizing annealing is to turn the lamellar cementite and proeutectoid cementite in the pearlite into spheroids, which are evenly distributed in the ferrite matrix (this structure is called spheroidized pearlite). Therefore, the carbon steel using spheroidizing annealing in this implementation realizes low hardness, improves machinability, eliminates residual stress, stabilizes the size, reduces deformation and cracking tendency, refines crystal grains, adjusts structure and eliminates structural defects, and adapts to the needs of the coal cutting environment. Step 300: Shot blasting to remove oxidation: polish an oxide layer on a surface of the workpiece by using a shot blasting machine, and clean an oil stain on the surface of the workpiece. By utilizing shot blasting to remove the surface oxide scale and impurities, this step improves appearance quality, facilitates subsequent coating processing during phosphating and saponification, and improves the adhesion of the film formed during phosphating and saponification. Meanwhile, shot blasting improves the internal stress of the cutting pick, and continuously impacts the surface of the strengthened workpiece through a high-speed moving shot stream, forcing the surface of the target to change in the cyclic deformation process. Specifically, the microstructure is modified, an uneven plastic deformation outer surface layer introduces a residual compressive stress, an inner surface layer generates a residual tensile stress, and the outer surface roughness changes. In this way, the fatigue fracture resistance of the material is improved, fatigue failure and plastic deformation are prevented, and the fatigue life is prolonged. In addition, in the annealing process in this implementation, oil quenching or operation generating oil stains is used, so the amount of oil stains on the workpiece is not large. The above annealing method is convenient for phosphating, and the oil removal operation can be completed by cleaning with an acid solution. There is no need to fully remove the oil in a degreasing tank, so cleaning and waste water treatment costs are reduced. In addition, in step 300, the cleaning an oil stain on the surface of the workpiece specifically includes: First, an oxide layer on the surface of the workpiece is removed through the shot blasting machine, and a particle on the surface of the workpiece is removed through a pulse air injecting port. The polished oxide layer particle can be separated from the workpiece under the action of air injecting, so as to realize first-level cleaning. This step can roughly remove most impurities on the workpiece. After air injecting cleaning, the polished workpiece is put in an acid solution pool for rolling rubbing to clean up the oil stain and fine particle on the workpiece. The acid solution pool can be used to dissolve oil stains. The second-level cleaning of the oil stain and fine particle on the surface of the workpiece is achieved through rolling rubbing. This step can remove most impurities on the workpiece in a centralized manner. It should be noted that most of the current cleaning equipment adopts ultrasonic cleaning, which can greatly improve the ability of cleaning the surface of the workpiece. However, the cost of the ultrasonic cleaning equipment is high, and the later maintenance is more complicated and difficult. In addition, the space of the ultrasonic cleaning equipment is limited, and the cutting pick workpieces cannot be cleaned in large quantities, resulting in waste of resources, high cost, and insignificant cleaning efficiency. Therefore, it is necessary to clean the workpieces by mechanical rolling rubbing so as to increase the number of cutting pick workpieces to be cleaned in batches while ensuring the cleaning ability. Therefore, the rolling rubbing of the workpiece specifically includes: Step 1: The workpiece is put on a lifting platform in the acid solution pool. The oil stain on the surface of the workpiece can be dissolved in the acid solution. The workpiece is carried by lifting in an up-and-down manner to facilitate the transfer of the workpiece after the cleaning is completed, and to facilitate subsequent processing operations. Step 2: A linear moving table is provided on an edge of the acid solution pool. A Z-shaped cleaning rod is provided on the linear moving table through a bearing. The Z-shaped cleaning rod is rotatable under the support of the lifting platform. The linear moving table can carry out circular linear movement along a long side of the acid solution pool. Under the action of an external force, the Z-shaped cleaning rod may rotate around a bearing mounting point. The Z-shaped cleaning rod may rotate with the up and down displacement of the lifting platform, which does not hinder the normal operation of the lifting platform. Step 3: A cleaning roller for rubbing the workpiece is provided on the Z-shaped cleaning rod through a bearing. The linear moving table drives the Z-shaped cleaning rod to move synchronously. Due to a frictional force between the cleaning roller and the workpiece on the lifting platform, the cleaning roller is rotated when linearly displaced, so as to realize the rolling rubbing of the workpiece. In this way, the residual oil stain on the surface of the workpiece and the fine slag of the polished steel can be removed, thereby improving the cleaning effect. After the rolling rubbing is completed, the cleaned workpiece is taken out of the acid solution pool, and secondary acid spray rinse is carried out through a nozzle on an upper end of the acid solution pool until the surface of the strengthened workpiece is free of any oil stain. A water stream with is used to impact the workpiece, thereby further washing a small amount of particulate impurities adhering on the surface of the workpiece to achieve complete cleaning. The acid strength of the solution used in the secondary acid spray rinse is relatively low, which can prevent the acid cleaning solution from entering the phosphating pool and causing the phosphating solution to be excessively acidic to affect the phosphating effect. The above step avoids the configuration of multiple sets of cleaning equipment, thereby reducing the cleaning cost and the reducing environmental contamination. In addition, the surface of the cleaned workpiece is smooth and tidy, which facilitates the even adhesion of the phosphated film, avoids damage to the phosphated film, improves the adhesion between the wear-resistant material and the steel workpiece, and prevents the phosphated film from falling off.
In addition, the cleaning with the acid solution can further remove the oxide layer on the surface of the metal workpiece, improve the cleanliness of the surface of the workpiece, and prevent the film on the surface of the workpiece from failing during phosphating and saponifying. Step 400: Primary phosphating and saponifying: put the cleaned workpiece into a phosphating pool and a saponifying pool according to a procedure to plasticize the surface of the workpiece. It needs to be supplemented that the phosphating treatment of the workpiece in the phosphating pool is also called phosphate treatment. The workpiece is put in a zinc-calcium series phosphating solution at a medium temperature, and a thin and dense phosphated film (zinc phosphate film), which is light gray to dark gray, hardly soluble in water, and is formed on the surface of the workpiece in a short time. The phosphating solution is at 60-80°C, the phosphating time is 10-20 min, the free acidity is 1.2-2.4, and the total acidity is 16-26. In the saponifying process, the phosphated workpiece is put in a saponifying solution including a saturated fatty acid having 16 to 18 carbon atoms, an extreme pressure anti-wear additive and a drawing lubricating. These components in the saponifying solution react with the zinc phosphate film on the surface of the workpiece to form a fatty acid zinc film and a saponified film layer. The fatty acid zinc film and the saponified film layer increase the plastic thickness of the deformation zone of the workpiece. A lubricating film is formed in a die hole and the processed material part, which can greatly reduce the heat and prevent the metal from sintering and melting. Due to the wear reduction and plasticization effects in the drawing die and the drawing part, the surface finish and processing accuracy of the drawn product are improved, and the wear between the drawing tool and the drawing die is reduced. The pH of the saponifying solution is 7.8-8.8, the saponifying solution is at 70-80°C, and the saponifying time is 15-30 min. During the phosphating reaction, only part of Fe2+ of iron dissolved on the surface of the workpiece can participate in film formation, and the other part of Fe2+ is oxidized to Fe3+. Fe 3 combines with phosphate to form insoluble iron phosphate (that is, the phosphating slag), which precipitates out of the solution. If the excessive phosphating slag is not controlled and removed, the phosphating slag will contaminate the phosphating solution and shorten the service life of the phosphating solution. In addition, when the phosphated film is formed, the phosphating slag will adhere to the surface of the workpiece, affecting the adhesion of the phosphated film, causing the phosphated film to fall off easily, and seriously affecting the phosphating result. Therefore, in this implementation, the following phosphating method is used to control and remove the excessive phosphating slag contacting the surface of the workpiece, so as to improve the adhesion of the phosphated film. The phosphating reaction in the phosphating pool is specifically implemented as follows: Step 401: Add a stage that is movable up and down at the bottom of the phosphating pool, provide a plurality of workpiece loading channels that are evenly and parallelly distributed on the stage, provide inclined sedimentation plates respectively on two sides of each of the workpiece loading channels, and combine the inclined sedimentation plates with the workpiece loading channel to form a conical inclined plate sedimentation tank. Step 402: Provide a frame-shaped support, which may stretch and contract up and down, on two sides of each of the workpiece loading channels, and provide a detachable semi-permeable filter membrane in the frame-shaped support. It should be particularly noted that the stage may be shaken in up, down, left and right directions according to a frequency, such that the surface of the workpiece is evenly phosphated and an even phosphated film is formed. The workpiece may be secured on the workpiece loading channel for phosphating treatment, and the phosphating slag generated during the phosphating treatment will sink into the conical inclined plate sedimentation tank for collection. Therefore, the workpiece can be separated from the phosphating slag, and the phosphating slag can be prevented from adhering to the surface of the workpiece, thereby improving the adhesion of the phosphated film to the workpiece. The specific implementation principle of the above step is as follows. First, when the workpiece is inserted into the workpiece loading channel for phosphating, the stage can be shaken in up, down, left and right directions according to a frequency. This can make the solubility of the phosphating solution even and improve the efficiency of the phosphating reaction. In addition, in the shaking process, the oxidized Fe2 , Zn2 and other metal ions on the workpiece are dispersed into the solution to further increase the contact area between the surface of the workpiece and the phosphating solution, so as to increase the activity and rate of the phosphating reaction. During the phosphating reaction, when Fe2 , Zn2+ and other metal ions are dispersed into the solution, the semi-permeable filter membrane only selectively allows the oxidized Fe 3 to pass and enter into the solution outside the semi-permeable filter membrane. They can only pass through the semi-permeable filter membrane in a forward direction, and cannot pass through the semi-permeable filter membrane in a reverse direction to enter the interior of the semi-permeable filter membrane again. In other words, the outer surface of the semi-permeable filter membrane does not affect the penetration of other ions in the solution. Since only Fe3ions are selectively isolated, the penetration of the phosphating slag precipitation is also prevented. Meanwhile, the inner surface of the semi-permeable filter membrane only selectively permeates the Fe ions, and does not allow other ions to permeate. This semi-permeable filter membrane ensures the normal operation of precipitation and crystallization of the phosphate to form the phosphated film, and prevents the phosphating slag from floating on the phosphated film to affect the accumulation and adhesion of the phosphated film. Step 403: Press the frame-shaped support down to contract, insert the workpiece into a recessed catch groove on the workpiece loading channel, and lift the frame-shaped support up to stretch to form a guardrail. Step 404: Provide an arc-shaped collection plate at the bottom of the conical inclined plate sedimentation tank, and collect a phosphating slag in the arc-shaped collection plate in a centralized manner. The frame-shaped support can be contracted to facilitate the insertion of the workpiece into the recessed catch groove on the workpiece loading channel. Meanwhile, the 3+ frame-shaped support can be stretched to form a guardrail to selectively permeate Fe , so as to prevent the phosphating slag from affecting the adhesion of the phosphated film. The phosphating slag sinks along the conical inclined plate sedimentation tank, and the arc-shaped collection plate can directly collect the phosphating slag to avoid contamination to the phosphating solution.
Step 405: Put the phosphated workpiece in the saponifying pool for saponifying. The phosphating and saponifying are designed to provide protection to the base metal
and prevent the metal from being corroded. They are also used for priming before coating so as to improve the adhesion and anti-corrosion ability of the coating film layer, and play the role of anti-friction and lubrication in the metal cold working process, which facilitates the subsequent cold extrusion treatment and avoids an internal stress and deformation of the workpiece. Step 500: Primary cold extrusion: subject the workpiece plasticized by the primary phosphating and saponifying to primary cold extrusion modification. Before the secondary phosphating and saponifying, the workpiece after the first cold extrusion is subjected to acid cleaning, so as to remove dirt adhering to the surface of the workpiece during the extrusion. Step 600: Secondary phosphating and saponification: put the workpiece after the primary cold extrusion into the phosphating pool and the saponification pool to carry out secondary plasticization of the surface of the workpiece. Step 700: Secondary cold extrusion: subject the workpiece plasticized by the secondary phosphating and saponifying to secondary cold extrusion modification. Step 800: Outer circle machining: cool the workpiece to room temperature, and machine an outer circle surface of the workpiece by a turning method to obtain a cutting pick. Although the present disclosure is described in detail above with the general description and specific embodiments, some modifications or improvements may still be made on the basis of the present disclosure, which is apparent to those skilled in the art. Therefore, these modifications or improvements made without departing from the spirit of the present disclosure all fall within the protection scope of the present disclosure. Industrial Applicability The present disclosure provides a cutting pick for coal cutter. The cutting pick includes a connecting shaft portion and a cutting top cap, the connecting shaft portion and the cutting top cap are integrally molded; an outer surface of the cutting top cap is provided with a plurality of evenly distributed recessed catch grooves. The present disclosure further provides a machining method of a cutting pick for coal cutter, which includes: feeding and smelting; spheroidizing annealing: taking a workpiece out of a combustion chamber, and cooling the workpiece at a controlled rate; shot blasting to remove oxidation: polishing an oxide layer on a surface of the workpiece by using a shot blasting machine, and cleaning an oil stain on the surface of the workpiece; primary phosphating and saponifying; primary cold extrusion; acid cleaning; secondary phosphating and saponifying; secondary cold extrusion; and outer circle machining. The present disclosure changes the internal structure and stress of the workpiece through the vacuum-isolated annealing treatment to ensure that the performance of the workpiece meets the requirements of the coal cutting process. In addition, the present disclosure utilizes rare air-isolated convection and hot water controlled cooling to avoid oil stains and other impurities appearing on the surface of the workpiece and avoid oxidation of the surface of the workpiece, thereby reducing the workpiece cleaning cost and improving the adhesion of the film in the subsequent phosphating and saponifying. The phosphating pool of the present disclosure can selectively control ion penetration, and isolate the workpiece from the phosphating slag, so as to avoid excessive phosphating slag contamination that shortens the service life of the phosphating solution, prevent the phosphating slag from approaching the surface of the workpiece to affect the quality of the phosphated film, and prevent the phosphating slag from destroying the density of the phosphated film, thereby improving the adhesion and corrosion resistance of the phosphated film.
Claims (10)
- CLAIMS 1. A cutting pick for coal cutter, comprising a connecting shaft portion (1) and a cutting top cap (2), wherein the connecting shaft portion (1) and the cutting top cap (2) are integrally molded; an outer surface of the cutting top cap (2) is provided with a plurality of evenly distributed recessed catch grooves (3); a side section of each of the recessed catch grooves (3) presents a triangular structure; an outer edge of each of the recessed catch grooves (3) is provided with an externally-extended inclined surface.
- 2. The cutting pick for coal cutter and a machining method thereof according to claim 1, wherein a wear-resistant phosphated film layer and a wear-resistant saponified film layer are provided on outer surfaces of the connecting shaft portion (1) and the cutting top cap (2).
- 3. The cutting pick for coal cutter and a machining method thereof according to claim 1, wherein the connecting shaft portion (1) is smoothly connected with a size transition section of the cutting top cap (2).
- 4. A machining method of a cutting pick for coal cutter, comprising: step 100: feeding and smelting: putting workpieces together in a combustion chamber and heating slowly; step 200: spheroidizing annealing: taking each of the workpieces out of the combustion chamber, and cooling the workpiece at a controlled rate; step 300: shot blasting to remove oxidation: polishing an oxide layer on a surface of the workpiece by using a shot blasting machine, and cleaning an oil stain on the surface of the workpiece; step 400: primary phosphating and saponifying: putting the cleaned workpiece into a phosphating pool and a saponifying pool according to a procedure to plasticize the surface of the workpiece; step 500: primary cold extrusion: subjecting the workpiece plasticized by the primary phosphating and saponifying to primary cold extrusion modification; step 600: secondary phosphating and saponifying: putting the workpiece after the primary cold extrusion into the phosphating pool and the saponifying pool to carry out secondary plasticization of the surface of the primary workpiece; step 700: secondary cold extrusion: subjecting the workpiece plasticized by the secondary phosphating and saponifying to secondary cold extrusion modification; and step 800: outer circle machining: cooling the workpiece to room temperature, and machining an outer circle surface of the workpiece by a turning method to obtain a cutting pick.
- 5. The machining method of the cutting pick for coal cutter according to claim 4, wherein in step 200, the spheroidizing annealing comprises: step 201: continuously heating the workpiece in the combustion chamber to 735-740°C, and calcinating the steel workpiece of the cutting pick at this temperature for 20-30 min; step 202: transferring the workpiece from the combustion chamber to a vacuum cooling furnace for isolated cooling, feeding argon into the vacuum cooling furnace, and controlling the cooling rate of 2-30 C/s through air convection; step 203: spraying, after isolated cooling for 10-15 min, circulating cooling hot water to the workpiece in the vacuum cooling furnace to control the cooling rate of 5-10°C/s; and step 204: taking the workpiece out from the vacuum cooling furnace when a surface temperature of the workpiece drops to room temperature.
- 6. The machining method of the cutting pick for coal cutter according to claim 4, wherein in step 300, the cleaning an oil stain on the surface of the workpiece comprises: first, removing the oxide layer on the surface of the workpiece through the shot blasting machine, and removing a particle on the surface of the workpiece through a pulse air injecting port; second, putting the polished workpiece in an acid solution pool for rolling rubbing to clean up the oil stain and fine particle on the workpiece; and finally, taking the cleaned workpiece out of the acid solution pool, and carrying out secondary acid spray rinse through a nozzle on an upper end of the acid solution pool until the surface of the strengthened workpiece is free of any oil stain.
- 7. The machining method of the cutting pick for coal cutter according to claim 6, wherein the rolling rubbing of the workpiece comprises: putting the workpiece on a lifting platform in the acid solution pool; providing a linear moving table on an edge of the acid solution pool, and providing a Z-shaped cleaning rod on the linear moving table through a bearing, wherein the Z-shaped cleaning rod is rotatable under the support of the lifting platform; and providing a cleaning roller, for rubbing the workpiece, on the Z-shaped cleaning rod through a bearing.
- 8. The machining method of the cutting pick for coal cutter according to claim 4, wherein before the secondary phosphating and saponifying in step 600, the workpiece after the first cold extrusion is subjected to acid cleaning, so as to remove dirt adhering to the surface of the workpiece during the extrusion.
- 9. The machining method of the cutting pick for coal cutter according to claim 4, wherein in step 400, the phosphating and saponifying are implemented as follows: step 401: adding a stage that is movable up and down at the bottom of the phosphating pool, providing a plurality of workpiece loading channels that are evenly and parallelly distributed on the stage, providing inclined sedimentation plates respectively on two sides of each of the workpiece loading channels, and combining the inclined sedimentation plates with the workpiece loading channel to form a conical inclined plate sedimentation tank; step 402: providing a frame-shaped support, which is stretch and contract up and down, on two sides of each of the workpiece loading channels, and providing a detachable semi-permeable filter membrane in the frame-shaped support; step 403: pressing the frame-shaped support down to contract, inserting the workpiece into a recessed catch groove on the workpiece loading channel, and lifting the frame-shaped support up to stretch to form a guardrail; step 404: providing an arc-shaped collection plate at the bottom of the conical inclined plate sedimentation tank, and collecting a phosphating slag in the arc-shaped collection plate in a centralized manner; and step 405: putting the phosphated workpiece in the saponifying pool for saponifying.
- 10. The machining method of the cutting pick for coal cutter according to claim 8, wherein the phosphating pool and the saponifying pool are shaken in up, down, left and right directions according to a frequency, such that the surface of the workpiece is evenly phosphated and an even phosphated film is formed.FIG. 1Feeding and smeltingSpheroidizing annealingShot blasting to remove oxidationPrimary phosphating and saponifyingPrimary cold extrusionAcid cleaningSecondary phosphating and saponifyingSecondary cold extrusionOuter circle machiningFIG. 2
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| CN201910323666.3 | 2019-04-22 | ||
| CN201910323666.3A CN109931058B (en) | 2019-04-22 | 2019-04-22 | Cutting pick for coal mining machine and processing method thereof |
| PCT/CN2019/119603 WO2020215710A1 (en) | 2019-04-22 | 2019-11-20 | Cutting pick for coal cutter and machining method therefor |
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| CN109931058B (en) * | 2019-04-22 | 2020-04-03 | 安徽澳德矿山机械设备科技股份有限公司 | Cutting pick for coal mining machine and processing method thereof |
| CN115466949B (en) * | 2022-09-30 | 2023-08-04 | 成都银河动力有限公司 | Phosphating process for ensuring roughness of piston pin hole to be less than or equal to Ra0.4 |
| CN115635258A (en) * | 2022-11-01 | 2023-01-24 | 盐城市欧特威机械科技有限公司 | Production process of cutting tooth for tunneling |
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| GB858513A (en) * | 1957-05-30 | 1961-01-11 | Murex Ltd | Improvements in or relating to cutting tools |
| US8123302B2 (en) * | 2006-08-11 | 2012-02-28 | Schlumberger Technology Corporation | Impact tool |
| CN201232552Y (en) * | 2008-06-25 | 2009-05-06 | 廖标跃 | Ratchet shaped coal cutter pick |
| CN201679500U (en) * | 2010-05-12 | 2010-12-22 | 宋继勇 | Rotary digging pick |
| CN105019897A (en) * | 2015-07-29 | 2015-11-04 | 桂林星钻超硬材料有限公司 | Long-service life polycrystalline diamond cutting tooth |
| CN205977215U (en) * | 2016-07-01 | 2017-02-22 | 包头科泰高技术材料有限责任公司 | Coal mining pick |
| CN106522940A (en) * | 2016-12-07 | 2017-03-22 | 新昌县东韩机械有限公司 | Abrasion-resistant tool bit |
| CN107263022B (en) * | 2017-05-16 | 2019-03-22 | 江苏创一精锻有限公司 | A kind of method for forging and molding with reinforcing rib pick |
| DE102018109150A1 (en) * | 2018-04-17 | 2019-10-17 | Betek Gmbh & Co. Kg | Tooth |
| CN108825231A (en) * | 2018-07-26 | 2018-11-16 | 许国梁 | A kind of wear-resisting type has the pick of shock-absorbing function |
| CN109931058B (en) * | 2019-04-22 | 2020-04-03 | 安徽澳德矿山机械设备科技股份有限公司 | Cutting pick for coal mining machine and processing method thereof |
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