CN211386896U - Manufacturing die and tool for light-duty electric pruning shears transmission eccentric block - Google Patents
Manufacturing die and tool for light-duty electric pruning shears transmission eccentric block Download PDFInfo
- Publication number
- CN211386896U CN211386896U CN201922276256.6U CN201922276256U CN211386896U CN 211386896 U CN211386896 U CN 211386896U CN 201922276256 U CN201922276256 U CN 201922276256U CN 211386896 U CN211386896 U CN 211386896U
- Authority
- CN
- China
- Prior art keywords
- punch
- supporting column
- hole
- eccentric block
- pruning shears
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 32
- 230000005540 biological transmission Effects 0.000 title claims abstract description 26
- 238000013138 pruning Methods 0.000 title claims abstract description 22
- 230000000149 penetrating effect Effects 0.000 claims description 6
- 238000004663 powder metallurgy Methods 0.000 abstract description 16
- 238000002360 preparation method Methods 0.000 abstract description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 21
- 238000000034 method Methods 0.000 description 21
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 20
- 238000005245 sintering Methods 0.000 description 19
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 16
- 238000010438 heat treatment Methods 0.000 description 13
- 239000000463 material Substances 0.000 description 13
- 230000008569 process Effects 0.000 description 13
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 12
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 12
- 238000003825 pressing Methods 0.000 description 11
- 229910002804 graphite Inorganic materials 0.000 description 10
- 239000010439 graphite Substances 0.000 description 10
- 238000005498 polishing Methods 0.000 description 10
- 238000005728 strengthening Methods 0.000 description 10
- 229910052799 carbon Inorganic materials 0.000 description 8
- 229910052804 chromium Inorganic materials 0.000 description 8
- 239000011651 chromium Substances 0.000 description 8
- 238000000227 grinding Methods 0.000 description 8
- 229910001562 pearlite Inorganic materials 0.000 description 8
- 239000004215 Carbon black (E152) Substances 0.000 description 6
- 229930195733 hydrocarbon Natural products 0.000 description 6
- 150000002430 hydrocarbons Chemical class 0.000 description 6
- 239000001257 hydrogen Substances 0.000 description 6
- 229910052739 hydrogen Inorganic materials 0.000 description 6
- 229910052742 iron Inorganic materials 0.000 description 6
- 239000007791 liquid phase Substances 0.000 description 6
- 239000000314 lubricant Substances 0.000 description 6
- 239000000843 powder Substances 0.000 description 6
- 239000006104 solid solution Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000003754 machining Methods 0.000 description 5
- 238000012545 processing Methods 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000003082 abrasive agent Substances 0.000 description 4
- 238000005256 carbonitriding Methods 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 4
- 239000010949 copper Substances 0.000 description 4
- 239000003974 emollient agent Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000003912 environmental pollution Methods 0.000 description 4
- 229910052750 molybdenum Inorganic materials 0.000 description 4
- 239000011733 molybdenum Substances 0.000 description 4
- 238000004080 punching Methods 0.000 description 4
- 239000002904 solvent Substances 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 238000005496 tempering Methods 0.000 description 4
- 238000002156 mixing Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- QIJNJJZPYXGIQM-UHFFFAOYSA-N 1lambda4,2lambda4-dimolybdacyclopropa-1,2,3-triene Chemical compound [Mo]=C=[Mo] QIJNJJZPYXGIQM-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910039444 MoC Inorganic materials 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 229910052593 corundum Inorganic materials 0.000 description 2
- 239000010431 corundum Substances 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000004821 distillation Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000004519 grease Substances 0.000 description 2
- 238000007654 immersion Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- FXNGWBDIVIGISM-UHFFFAOYSA-N methylidynechromium Chemical compound [Cr]#[C] FXNGWBDIVIGISM-UHFFFAOYSA-N 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 230000008929 regeneration Effects 0.000 description 2
- 238000011069 regeneration method Methods 0.000 description 2
- 238000011012 sanitization Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000004381 surface treatment Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 238000003898 horticulture Methods 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Landscapes
- Powder Metallurgy (AREA)
Abstract
The utility modelThe type discloses a preparation mould and frock of light-duty electronic pruning scissors with transmission eccentric block, belongs to powder metallurgy technical field. The die comprises an upper punch, an upper second punch, a lower second punch, a lower third punch, a lower core rod and a middle die, wherein the upper punch and the upper punch are sleeved and matched above the middle die; the lower core rod is arranged in the lower three punches, the lower two punches are cylindrical, first guide grooves are formed in the outer circumferential surfaces of the lower two punches, second guide grooves are formed in the outer circumferential surfaces of the lower three punches, the first guide grooves and the second guide grooves are attached, and the lower punches, the lower two punches and the lower three punches are arranged below the middle die in a sleeved fit mode. The density of the product reaches 7.1-7.2g/cm3The product has uniform density, high precision, good consistency and high production efficiency.
Description
Technical Field
The utility model relates to a light-duty electronic pruning is preparation mould and frock of transmission eccentric block for scissors belongs to powder metallurgy technical field.
Background
Pruning shears are one of the commonly used garden tools for pruning flowers, plants and shrubs in the process of landscaping. Ordinary pruning scissors generally need manual operation, and it is hard to use to waste time, and intensity of labour is big, and is inefficient, can't satisfy modern horticulture practitioner's work demand. Along with the development of times, the electric garden tool is rapidly developed, people are more familiar and endurable to products with simple operation, good reliability, long service life, multiple purposes, low noise, light weight and high power storage capacity, the garden tool is developed towards miniaturization, and the garden tool is strived for the products to be simple, light, practical and durable.
Light-duty pruning scissors is the novel model type that a section was suitable for one-man operation developed based on above-mentioned requirement, and it strives for the science and technology ization in the selection of part and structure, and the lightweight, therefore all its transmission parts all require light and handy, high strength, and for noise reduction simultaneously, also proposed very high requirement to the precision of part. The high-strength transmission eccentric block is composed of a double-circle eccentric plate and 2 pins as shown in figure 1, the double-circle eccentric plate is thin and only 3mm thick for reducing weight, and the structural characteristic makes the double-circle eccentric plate difficult to machine during production by a machining method, the precision and the product consistency are difficult to guarantee, stable batch production cannot be formed, and in addition, the machining production cost is high, so that the market competition of enterprises is not facilitated.
Through search, the process and the device of powder metallurgy similar to the eccentric block are disclosed, for example, the patent documents: chinese application No. 201822214786.3, published 2019, 9 and 13 discloses a powder metallurgy spindle eccentric block of a turbine air conditioner compressor, which comprises a positioning rod, an eccentric block and a spindle, the main shaft is fixedly arranged on the edge of the surface of one end of the eccentric block, the positioning rod is fixedly arranged on the edge of the surface of the other end of the eccentric block, a connecting rod is fixedly arranged inside the main shaft, the top end of the connecting rod is fixedly connected with a fixed block, the edge of the top end of the fixed block is provided with a clamping groove, the center of the top end of the fixed block is provided with a first threaded hole, the upper surface of the inner part of the eccentric block is provided with a fixed groove, the bottom surface of the eccentric block is provided with an inserting groove, the upper surface of eccentric block rotates and is connected with first bolt, the other end that the fixed slot was kept away from to the upper surface of eccentric block has seted up the second screw hole, the lower extreme surface of locating lever has the external screw thread.
For another example, chinese application No. 201420020765.7, published as 2014, 7/2 discloses a powder metallurgy eccentric wheel, which includes a gear plate, a central axle pin and an eccentric axle pin, wherein gear teeth are disposed on a circumferential surface of the gear plate, a central axle pin hole and an eccentric axle pin hole are disposed on the gear plate, and the central axle pin is assembled in the central axle pin hole and located on one side of the gear plate; the eccentric shaft pin is assembled in the eccentric shaft pin hole and is positioned on the other side of the gear disc; the gear disc, the central shaft pin and the eccentric shaft pin form an eccentric mechanism, and when the gear disc rotates around the central shaft pin to do circular motion, the gear disc reciprocates through the eccentric shaft pin and a connecting rod mechanism matched with the eccentric shaft pin.
For another example, the chinese application No. 201721336247.6, published as 2018, 5.22, discloses a powder metallurgy eccentric wheel, which comprises an intermodal wheel, an eccentric wheel, a battery piece, a fixed block, a rotating electrical machine, a grease storage tank, a nozzle groove, a nozzle, an axial-flow pump and a grease outlet pipe, wherein the intermodal wheel is installed on the lower end face of the eccentric wheel, the lower end face of the eccentric wheel is provided with an inner cavity, the battery piece is installed on the rear side in the eccentric wheel, the fixed block is fixed on the upper side in the eccentric wheel, and the rotating electrical machine is installed on the.
The above patent discloses that the structure of the eccentric wheel is completely different from the structure of the transmission eccentric block of the patent, and does not disclose the powder metallurgy process of the transmission eccentric block, so how to develop a preparation process of the transmission eccentric block is a problem to be solved urgently.
Disclosure of Invention
1. Problems to be solved
To the problem that current transmission eccentric turbine machining precision and product uniformity are difficult to guarantee, the utility model provides a light-duty pruning is preparation mould and frock of transmission eccentric block for scissors can produce the precision height, high strength, high abrasion, and the transmission eccentric block that the product uniformity is good.
2. Technical scheme
In order to solve the above problems, the utility model adopts the following technical proposal.
The utility model discloses a manufacturing method of light-duty pruning scissors is with transmission eccentric block, including following specific step:
A. manufacture of double-circle eccentric plate
S101, batching: selecting and mixing iron powder, graphite, chromium powder, molybdenum powder, copper powder and Qingfan Xiang QFXSKZ800 lubricant, wherein the mass fractions of the components are 91.3-94.05% of the iron powder, 0.4-0.65% of the graphite, 2.8-3.2% of the chromium powder, 0.45-0.55% of the molybdenum powder, 1.8-2.2% of the copper powder, 0.4-0.6% of the lubricant and 0.1-1.5% of the other components by mass percent, when the materials are prepared, firstly, the chromium powder, the molybdenum powder and the iron powder are bonded and pre-alloyed to prepare CrM base powder, and then the CrM base powder is mixed with the graphite, the copper powder and the release agent for 60 minutes;
graphite (carbon) is dissolved in iron in the sintering process to form an interstitial solid solution, so that the solid solution strengthening effect is achieved, and meanwhile, the carbon improves the microstructure of the material, forms pearlite with ferrite, has a good strengthening effect and improves the mechanical property; chromium can be dissolved in iron to achieve solid solution strengthening, and meanwhile, the chromium and graphite form liquid phase sintering at the temperature of 1160-1260 ℃, so that the density, the strength and the wear resistance of the powder metallurgy product are improved; molybdenum is easy to form carbide with carbon, precipitation strengthening is performed, the wear resistance is improved, the pearlite transformation is delayed, the pearlite structure is refined, the pearlite content is increased, the hardenability is improved, meanwhile, a molybdenum carbide strengthening crystal boundary is formed after heat treatment, the high-temperature strength and high-temperature hardness are realized, the sufficient strength and creep resistance can be maintained at high temperature, the red hardness is improved, and the material tempering brittleness is inhibited; copper begins to melt at about 1083 ℃ to generate an instantaneous liquid phase, so that a base body is lubricated to promote sintering, and the copper and the chromium are added simultaneously, so that the strength and the hardness of the material are improved, the structure uniformity and the section sensitivity of sintered steel can be improved, and the machining performance of a product is improved;
s102, die forming: a die designed aiming at the structural characteristics of the transmission eccentric block is arranged on a 100-year and 120-ton mechanical press machine, and the double-circle eccentric plate is pressed at one time;
s103, high-temperature sintering: because the material contains alloy elements such as chromium, molybdenum and the like, the sintering temperature of a sintering furnace of a common powder metallurgy part is about 1120 ℃, and the chromium-carbon liquid phase sintering can not be finished. Adopting a special mesh belt type high-temperature sintering furnace, wherein the nitrogen-hydrogen ratio is 90: 10 in the protective atmosphere of nitrogen-hydrogen mixed gas, sintering at 1250 ℃ for 35-40 minutes;
s104, heat treatment: performing surface carbonitriding heat treatment in a well-type carbonitriding heat treatment furnace at 850 deg.C for 80min with carbon potential of 0.7-0.8; oil cooling at 100 deg.C/10 min; tempering at 200 ℃ for 2 hours to ensure that the hardness of each part of the double-round block is HRC48-58, while the heat treatment hardness of the common iron-based powder metallurgy workpiece is HRC30-45 generally;
s105, flat grinding: the product is placed on the working table of a surface grinding machine in order, the end face of the product is ground flatly, and the height dimension and the parallelism are guaranteed to be 0.03 mm;
B. manufacture of pins
The pin column is made of GCr15 material, has the hardness of HRC50-60, has higher requirement on excircle precision, has tolerance within 0.005mm, can be processed and manufactured by the working procedures of blank refining, chamfering, heat treatment, excircle grinding, grinding and the like, and has the diameter of 0.005-0.015mm larger than the base hole of the double-circle eccentric plate to be assembled;
C. and (3) pin pressing and assembling: assembling the double-circle eccentric plate and the pin column by using a tool on a 1-2 ton pneumatic press;
D. surface treatment: polishing for 20-30 minutes by a spiral vibration polishing machine to remove oil stains and flash on the surface; the abrasive material is selected from 10mm x 10mm regular hexahedral corundum, the polishing oil is selected from FT-10GS polishing oil, and a polishing oil circulating and filtering system is matched, so that the abrasive material can be repeatedly recycled, the environmental pollution cannot be caused, and the environment-friendly requirement is met;
E. cleaning: through crawler-type ultrasonic cleaner, with the product sanitization, the production of whole product is accomplished to rethread immersion oil rust-resistant technology, and the cleaner that ultrasonic cleaner used is FT-1970QX environmental protection hydrocarbon cleaning solvent, and 70 ℃ flash point does not belong to dangerous chemicals, and is furnished with hydrocarbon solvent regeneration recovery system, can purify the recycle again through distillation plant to dirty hydrocarbon cleaner, can not cause environmental pollution.
In a possible embodiment of the present invention, the mold comprises an upper punch, an upper second punch, a lower second punch, a lower third punch, a lower mandrel and a middle mold, wherein the upper punch and the upper punch are sleeved and matched above the middle mold; the lower core rod is arranged in the lower three punches, the lower two punches are cylindrical, first guide grooves are formed in the outer circumferential surfaces of the lower two punches, second guide grooves are formed in the outer circumferential surfaces of the lower three punches, the first guide grooves and the second guide grooves are attached, and the lower punches, the lower two punches and the lower three punches are arranged below the middle die in a sleeved fit mode.
In a possible embodiment of the utility model, the tool comprises a base, a reset spring, a first support column, a second support column, a guide shaft press pin pad and a press head pad, wherein the base is symmetrically provided with two counter bores for placing the reset spring, the first support column and the second support column, the bottom center is provided with a threaded hole for connecting with a pneumatic press workbench, and the guide shaft is fixed in a central hole of the base; the pressing pin pad is provided with a middle hole for placing the guide shaft, a first through hole for penetrating a screw to be connected with the base, a second through hole for penetrating the first supporting column and the second supporting column and a third through hole for placing the pin column to be assembled, and the pressing head pad is arranged on the double-circle eccentric plate during use.
In a possible embodiment of the present invention, the volume ratio of nitrogen to hydrogen in the nitrogen-hydrogen mixture is 90: 10.
in a possible embodiment of the present invention, the aperture of the second through hole is 0.1mm larger than the outer diameter of the first support column or the second support column.
In a possible embodiment of the present invention, the aperture of the third through hole is 0.1mm larger than the pin diameter.
In a possible embodiment of the present invention, the guide shaft is smaller than the hole diameter of the eccentric plate by 0.1 mm.
In a possible embodiment of the present invention, the first support column and the second support column lower end are both provided with flanges, the height of the first support column is greater than that of the second support column, the end face drop of the first support column and the second support column is consistent with the edge thickness of the double-circle eccentric plate, and the second support column is exposed out of the pressing pin pad and is consistent with the total thickness of the double-circle eccentric plate.
The utility model also provides a light-duty pruning scissors who obtains by above-mentioned method uses transmission eccentric block.
3. Advantageous effects
Compared with the prior art, the beneficial effects of the utility model are that:
(1) the utility model discloses a manufacturing approach of light-duty pruning scissors with transmission eccentric block, 2 round pins on the high strength transmission eccentric block will bear very big impact load, if directly press forming through the powder metallurgy method, can't bear the impact load under the specific operating mode, combine the characteristics of powder metallurgy method and the performance requirement of product high strength, the utility model discloses improve the innovation based on traditional powder metallurgy method, split into two parts of semicircle eccentric plate and round pin with the product eccentric block, the semicircle eccentric plate passes through the mould and directly presses forming, and the round pin is impressed through the frock matched stack, and product strength is high, and density is even;
require that each part of the double-circle eccentric plate is denseThe degree is consistent, and the density is 7.1-7.2g/cm3The hardness HRC48-58, because the saw blade reciprocates on it, need very strong wearability, to its structural feature and mechanical property requirement, design upper and lower three die structures to guarantee that the density of each position can be adjusted while pressing, finally realize that the density of each position is uniform, in order to realize high accuracy, high strength, high hardness and wearability requirement, use the powder of the particular formulation, sinter through the particular high-temperature sintering furnace, make its organization fully alloyed, finish the manufacture of the eccentric plate of the double circle through the heat treatment furnace process of the pit furnace, etc., match the pin column with double round block through the specialized matched stack frock finally, finish the production of the products;
(2) the utility model discloses a manufacturing method of a transmission eccentric block for light pruning shears, which designs a mould into a structure of 'upper two and lower three', and detaches a lower two punch with the same shape at the position corresponding to the upper two punch, so that the powder loading of each part can be adjusted in the pressing and forming process, thereby ensuring that the density of each part is uniform; meanwhile, the lower end face of the product is formed by the next punch, the lower second punch and the lower third punch, in order to enable the product to form a whole circle and prevent the three lower punches from rotating in the die cavity, axial guide grooves are designed at the joint positions of the lower second punch and the lower third punch, so that die filling and product production are convenient, if the die is not designed in this way, the die is not easy to be aligned, the product double circle is probably not a whole circle, and the density is 7.1-7.2g/cm3The product has the advantages of uniform density, high precision, good consistency, high production efficiency, 2500 shift yield which is 10 times of the processing efficiency of steel parts, the cost which is only 50 percent of that of the steel parts, and the material utilization rate which is more than 99 percent, and is suitable for mass stable production.
Drawings
FIG. 1 is a schematic structural view of a driving eccentric block for light pruning shears according to the present invention;
FIG. 2 is a schematic view of the mold structure of the present invention;
FIG. 3 is a front view of the tool of the present invention;
FIG. 4 is a side view of FIG. 3;
fig. 5 is a top view of the press pin pad of the tooling of the present invention.
The notation in the figure is:
100. a mold; 110. punching by a die; 120. punching the upper two dies; 140. next stamping; 150. punching the lower second die; 160. punching the lower three dies; 170. a lower core rod; 180. an intermediate die;
200. assembling; 210. a base; 220. a return spring; 230. a first support column; 240. a second support column; 250. a guide shaft; 260. a pin pressing pad; 261. a first through hole; 262. a second through hole; 263. a third through hole; 264. a mesopore; 270. a pressure head pad;
300. a double-circle eccentric plate;
400. and (4) a pin.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. Furthermore, the technical features mentioned in the embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
The following are iron powder, graphite, chromium powder, molybdenum powder, copper powder that the embodiment used and purchase by the market, in addition, the qing fan xiang QFXSKZ800 emollient is purchased in Guangzhou qing fan xiang new material limited company, the utility model discloses a emollient is not restricted to above-mentioned qing fan xiang QFXSKZ800 emollient, and all lubricants the same with qing fan xiang QFXSKZ800 emollient composition can be replaced.
Example 1
The manufacturing method of the transmission eccentric block for the light pruning shears comprises the following specific steps:
A. manufacture of double-circle eccentric plate 300
S101, batching: selecting and mixing iron powder, graphite, chromium powder, molybdenum powder, copper powder and a Qingfan Xiang QFXSKZ800 lubricant, wherein the mass fractions of the components are 91.3-94.05% of the iron powder, 0.4-0.65% of the graphite, 2.8-3.2% of the chromium powder, 0.45-0.55% of the molybdenum powder, 1.8-2.2% of the copper powder, 0.4-0.6% of the super lubricant and 0.1-1.5% of the other components by mass percent, and when proportioning, firstly, carrying out bonding pre-alloying on the chromium powder, the molybdenum powder and the iron powder to prepare CrM base powder, and then mixing the CrM base powder with the graphite, the copper powder and the release agent for 60 minutes;
it should be noted that: graphite (carbon) is dissolved in iron in the sintering process to form an interstitial solid solution, so that the solid solution strengthening effect is achieved, meanwhile, the carbon can improve the microstructure of the material and form pearlite with ferrite, the strengthening effect is good, and the mechanical property is improved; chromium can be dissolved in iron to achieve solid solution strengthening, and meanwhile, the chromium and graphite form liquid phase sintering at the temperature of 1160-1260 ℃, so that the density, the strength and the wear resistance of the powder metallurgy product are improved; molybdenum is easy to form carbide with carbon, precipitation strengthening is performed, the wear resistance is improved, the pearlite transformation is delayed, the pearlite structure is refined, the pearlite content is increased, the hardenability is improved, meanwhile, a molybdenum carbide strengthening crystal boundary is formed after heat treatment, the high-temperature strength and high-temperature hardness are realized, the sufficient strength and creep resistance can be maintained at high temperature, the red hardness is improved, and the material tempering brittleness is inhibited; copper begins to melt at about 1083 ℃ to generate an instantaneous liquid phase, so that a base body is lubricated to promote sintering, and the copper and the chromium are added simultaneously, so that the strength and the hardness of the material are improved, the structure uniformity and the section sensitivity of sintered steel can be improved, and the machining performance of a product is improved;
s102, die forming: a die 100 designed aiming at the structural characteristics of the transmission eccentric block is arranged on a 100-ton mechanical press machine, and a double-circle eccentric plate 300 is pressed at one time;
as shown in fig. 2, the die 100 includes an upper punch 110, an upper second punch 120, a lower punch 140, a lower second punch 150, a lower third punch 160, a lower mandrel 170, and an intermediate die 180, wherein the upper punch 110 and the upper punch 110 are disposed above the intermediate die 180 in a sleeved fit; the lower core rod 170 is arranged in the lower third punch 160, the lower second punch 150 is cylindrical, a first guide groove is formed in the outer circumferential surface of the lower third punch 160, a second guide groove is formed in the outer circumferential surface of the lower third punch 160, the first guide groove and the second guide groove are attached to each other, and the lower first punch 140, the lower second punch 150 and the lower third punch 160 are arranged below the middle die 180 in a sleeved fit manner;
s103, high-temperature sintering: because the material contains alloy elements such as chromium, molybdenum and the like, the sintering temperature of a sintering furnace of a common powder metallurgy part is about 1120 ℃, and the chromium-carbon liquid phase sintering can not be finished. Adopting a special mesh belt type high-temperature sintering furnace, wherein the nitrogen-hydrogen ratio is 90: 10 in the protective atmosphere of nitrogen-hydrogen mixed gas, sintering for 40 minutes at 1250 ℃;
s104, heat treatment: performing surface carbonitriding heat treatment in a well-type carbonitriding heat treatment furnace at a carbon potential of 0.8 and a temperature of 850 ℃ for 80 min; oil cooling at 100 deg.C/10 min; tempering at 200 ℃ for 2 hours to ensure that the hardness of each part of the double-round block is HRC48-58, while the heat treatment hardness of the common iron-based powder metallurgy workpiece is HRC30-45 generally;
s105, flat grinding: the product is placed on the working table of a surface grinding machine in order, the end face of the product is ground flatly, and the height dimension and the parallelism are guaranteed to be 0.03 mm;
B. fabrication of Pin 400
The pin column 400 is made of GCr15 material, has the hardness of HRC50-60, has high requirement on excircle precision, has the tolerance within 0.005mm, is processed and manufactured by the working procedures of blank refining, chamfering, heat treatment, excircle grinding, grinding and the like, all of which are the prior conventional technologies, and the diameter of the pin column 400 is 0.015mm larger than the base hole of the assembled double-circle eccentric plate 300;
C. and (3) pin pressing and assembling: assembling a double-circle eccentric plate 300 and a pin column 400 by using a tool 200 on a 1-ton pneumatic press;
as shown in fig. 3 to 5, the tooling 200 includes a base 210, a return spring 220, a first support column 230, a second support column 240, a guide shaft 250, a press pin pad 260 and a press head pad, two counter bores are symmetrically formed in the base 210, the counter bores are used for placing the return spring 220, the first support column 230 and the second support column 240, a threaded hole is formed in the center of the bottom for connecting with a pneumatic press workbench, and the guide shaft 250 is fixed in a central hole in the center of the base 210; the pressure pin pad 260 is provided with a middle hole for placing the guide shaft 250, a first through hole for penetrating a screw to be connected with the base 210, a second through hole for penetrating the first supporting column 230 and the second supporting column 240 and a third through hole for placing the pin column 400 to be assembled, and the pressure head pad is placed on the double-circle eccentric plate 300 when in use;
the aperture of the second through hole is 0.1mm larger than the outer diameter of the first support column 230 or the second support column 240; the aperture of the third through-hole is 0.1mm larger than the diameter of the pin 400; the diameter of the guide shaft 250 is 0.1mm smaller than that of the hole in the double-circle eccentric plate 300;
flanges are arranged at the lower ends of the first supporting column 230 and the second supporting column 240, the height of the first supporting column 230 is greater than that of the second supporting column 240, the end surface fall between the first supporting column 230 and the second supporting column 240 is consistent with the edge thickness of the double-circle eccentric plate 300, and the length of the second supporting column 240 exposed out of the pressure pin pad 260 is consistent with the total thickness of the double-circle eccentric plate 300;
D. surface treatment: polishing for 30 minutes by a spiral vibration polishing machine to remove surface oil stains and flash burrs; the abrasive material is selected from 10mm x 10mm regular hexahedral corundum, the polishing oil is selected from FT-10GS polishing oil, and a polishing oil circulating and filtering system is matched, so that the abrasive material can be repeatedly recycled, the environmental pollution cannot be caused, and the environment-friendly requirement is met;
E. cleaning: through crawler-type ultrasonic cleaner, with the product sanitization, the production of whole product is accomplished to rethread immersion oil rust-resistant technology, and the cleaner that ultrasonic cleaner used is FT-1970QX environmental protection hydrocarbon cleaning solvent, and 70 ℃ flash point does not belong to dangerous chemicals, and is furnished with hydrocarbon solvent regeneration recovery system, can purify the recycle again through distillation plant to dirty hydrocarbon cleaner, can not cause environmental pollution.
1) connecting the base 210 with the pneumatic press workbench by using M8 threads;
2) 2 return springs 220 are placed in two counterbores of the base 210;
3) placing 2 support columns on the spring;
4) passing the press pin pad 260 through the two support columns;
5) connecting the press pin pad 260 with the base 210 by screws;
6) and lightly knocking the guide shaft 250 into the press pin pad 260 and the central hole of the base 210, thereby completing the installation of the tool 200.
Assembling the pin 400:
1) placing two pins 400 into two holes of the press pin pad 260 (the holes are 0.1mm larger than the pin diameter);
2) sleeving the middle hole of the double-circle eccentric plate 300 into the guide shaft 250;
3) rotating the double-circle eccentric plate 300 around the guide shaft 250 to enable the whole circle part of the double-circle eccentric plate 300 to be positioned at one side of the second support column 240 and the corresponding semicircle part to be positioned at one side of the first support column 230, and when the top ends of the two pins 400 just fall into the two holes of the double-circle eccentric plate 300 in the rotating process, the double-circle eccentric plate 300 is stably supported by the first support column 230 and the second support column 240;
4) and pressing a starting switch of the pneumatic press, descending a pressure head of the pneumatic press, pressing the double-circle eccentric plate 300 to descend, compressing the return spring 220, pressing the two pins 400 into the holes of the double-circle eccentric plate 300, bouncing the return spring 220 to reset, taking out the assembled product, and finishing assembly.
Example 2
The processing was carried out in the same manner as in example 1, and the process parameters of the production method are shown in Table 1.
Example 3
The processing was carried out in the same manner as in example 1, and the process parameters of the production method are shown in Table 1.
Example 4
The processing was carried out in the same manner as in example 1, and the process parameters of the production method are shown in Table 1.
Example 5
The processing was carried out in the same manner as in example 1, and the process parameters of the production method are shown in Table 1.
Table 1 process parameters of the fabrication method of the examples
| Raw material/%) | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 |
| Iron powder | 94.05 | 91.3 | 93.0 | 92.5 | 91.8 |
| Graphite (II) | 0.4 | 0.65 | 0.5 | 0.6 | 0.53 |
| Chromium powder | 2.8 | 3.2 | 3.0 | 3.1 | 3.2 |
| Molybdenum powder | 0.45 | 0.55 | 0.50 | 0.52 | 0.5 |
| Copper powder | 1.8 | 2.2 | 2.0 | 1.9 | 2.1 |
| Lubricant agent | 0.4 | 0.6 | 0.5 | 0.52 | 0.6 |
| Others | 0.1 | 1.5 | 0.5 | 0.86 | 1.27 |
The above is only a preferred embodiment of the present invention, and it should be noted that: for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be considered as the protection scope of the present invention.
Claims (7)
1. The manufacturing die of the transmission eccentric block for the light pruning shears is characterized in that the die (100) comprises an upper punch (110), an upper second punch (120), a lower punch (140), a lower second punch (150), a lower third punch (160), a lower mandrel (170) and a middle die (180), wherein the upper punch (110) and the upper punch (110) are sleeved and matched above the middle die (180); the lower core rod (170) is arranged in the lower three-punch (160), the lower two-punch (150) is cylindrical, a first guide groove is formed in the outer circumferential surface of the lower two-punch, the lower three-punch (160) is cylindrical, a second guide groove is formed in the outer circumferential surface of the lower three-punch, the first guide groove is attached to the second guide groove, and the lower one-punch (140), the lower two-punch (150) and the lower three-punch (160) are arranged below the middle die (180) in a sleeved and matched mode.
2. The mold for manufacturing the driving eccentric block of the light pruning shears according to claim 1, wherein the first guide groove and the second guide groove are both semi-circular arc-shaped in cross section.
3. The manufacturing tool of the transmission eccentric block for the light pruning shears is characterized in that the tool (200) comprises a base (210), a reset spring (220), a first supporting column (230), a second supporting column (240), a guide shaft (250), a pressure pin pad (260) and a pressure head pad (270), wherein two counter bores are symmetrically formed in the base (210), the counter bores are used for placing the reset spring (220), the first supporting column (230) and the second supporting column (240), a threaded hole is formed in the center of the base and used for being connected with a pneumatic press workbench, and the guide shaft (250) is fixed in a middle hole in the center of the base (210); the pressure pin pad (260) is provided with a middle hole (264) for placing the guide shaft (250), a first through hole (261) for penetrating a screw to be connected with the base (210), a second through hole (262) for penetrating the first supporting column (230) and the second supporting column (240) and a third through hole (263) for placing the pin column (400) to be assembled, and the pressure head pad (270) is arranged on the double-circle eccentric plate (300) during use.
4. The tooling for manufacturing the transmission eccentric block for the light pruning shears according to claim 3, wherein the aperture of the second through hole (262) is 0.1mm larger than the outer diameter of the first supporting column (230) or the second supporting column (240).
5. The tooling for manufacturing the transmission eccentric block for the light pruning shears as recited in claim 3, wherein the aperture of the third through hole (263) is 0.1mm larger than the diameter of the pin (400).
6. The tooling for manufacturing the transmission eccentric block for the light pruning shears according to claim 5, wherein the diameter of the guide shaft (250) is 0.1mm smaller than that of the hole in the double-circle eccentric plate (300).
7. The tooling for manufacturing the transmission eccentric block for the light pruning shears according to claim 6, wherein flanges are arranged at the lower ends of the first supporting column (230) and the second supporting column (240), the height of the first supporting column (230) is greater than that of the second supporting column (240), the end surface fall of the first supporting column (230) and the second supporting column (240) is consistent with the edge thickness of the double-circle eccentric plate (300), and the length of the second supporting column (240) exposed out of the pressure pin pad (260) is consistent with the total thickness of the double-circle eccentric plate (300).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922276256.6U CN211386896U (en) | 2019-12-17 | 2019-12-17 | Manufacturing die and tool for light-duty electric pruning shears transmission eccentric block |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922276256.6U CN211386896U (en) | 2019-12-17 | 2019-12-17 | Manufacturing die and tool for light-duty electric pruning shears transmission eccentric block |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211386896U true CN211386896U (en) | 2020-09-01 |
Family
ID=72231311
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922276256.6U Expired - Fee Related CN211386896U (en) | 2019-12-17 | 2019-12-17 | Manufacturing die and tool for light-duty electric pruning shears transmission eccentric block |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211386896U (en) |
-
2019
- 2019-12-17 CN CN201922276256.6U patent/CN211386896U/en not_active Expired - Fee Related
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1946500B (en) | Sintered metal parts and method for the manufacturing thereof | |
| CN100441711C (en) | Manufacture method of high-strength powder metallurgy bevel gear and copper seeping agent for the same | |
| CN1158361A (en) | Corrosion resistant, high vanadium, powder metallurgy tool steel articles with improved metal to metal wear resistance and method for producing the sme | |
| CN103757551A (en) | Mechanically actuated chain wheel material, and manufacturing method thereof | |
| CN110947952B (en) | Transmission eccentric block for light electric pruning shears and manufacturing method thereof | |
| CN104033380A (en) | Vane pump | |
| CN104440601A (en) | Diamond grinding wheel for high-speed four-edge grinding and manufacturing method thereof | |
| CN103470634B (en) | A kind of linear bearing retainer and processing technology thereof | |
| CN103831432A (en) | Automobile power steering pump powder metallurgy inner and outer rotor formula and preparation technology | |
| CN103691958A (en) | Powdered metallurgical gear processing technology | |
| CN102601583A (en) | Near-net forming manufacturing method of sliding bearing dual-metal thrust sleeve and mold thereof | |
| CN103567433A (en) | Powder metallurgy valve seat and preparation method thereof | |
| CN211386896U (en) | Manufacturing die and tool for light-duty electric pruning shears transmission eccentric block | |
| CN101514726A (en) | Once grinding technology of steel ball for high-grade car transmission shaft | |
| CN102248373A (en) | Method for manufacturing air condition compressor balance block | |
| CN201231299Y (en) | Cold-heading roller punch die | |
| CN102554572A (en) | Processing technology for plate hub of driven plate assembly and mould component adopted in the processing technology | |
| CN107663615B (en) | A kind of high self-lubricating ferrous alloy of high intensity and preparation method and application | |
| CN107584287A (en) | A kind of preparation method of micro- texture self-lubricating ceramic guide rail | |
| CN103697144A (en) | Manufacturing method for short-pitch precise chain wheel | |
| CN107587022B (en) | A kind of ceramic tool material, cutter and manufacturing method | |
| CN102817848B (en) | Sliding plate of rotary compressor, and manufacturing method thereof | |
| CN103979007A (en) | Rack pressing block for gear rack steering engine | |
| CN108582504B (en) | Energy-saving efficient diamond saw blade and preparation method thereof | |
| CN105945289A (en) | Powder forging technology for main speed reduction gear for automobile manual transmission |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200901 |