CN111842901A - Powder metallurgy processing technology suitable for VVT engine belt pulley - Google Patents
Powder metallurgy processing technology suitable for VVT engine belt pulley Download PDFInfo
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- CN111842901A CN111842901A CN202010808366.7A CN202010808366A CN111842901A CN 111842901 A CN111842901 A CN 111842901A CN 202010808366 A CN202010808366 A CN 202010808366A CN 111842901 A CN111842901 A CN 111842901A
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- belt pulley
- powder
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- sintering
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/12—Both compacting and sintering
- B22F3/16—Both compacting and sintering in successive or repeated steps
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/24—After-treatment of workpieces or articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/24—After-treatment of workpieces or articles
- B22F3/26—Impregnating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/24—After-treatment of workpieces or articles
- B22F2003/241—Chemical after-treatment on the surface
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/24—After-treatment of workpieces or articles
- B22F2003/247—Removing material: carving, cleaning, grinding, hobbing, honing, lapping, polishing, milling, shaving, skiving, turning the surface
Abstract
The invention provides a powder metallurgy processing technology suitable for a VVT (variable valve timing) engine belt pulley, which is characterized in that belt pulley raw materials are placed in a mixer according to a formula ratio for powder mixing treatment; heating the press to above 40 ℃, placing the mixed raw materials into the press, and pressing the mixed raw materials at the pressure of 1650 and 1800 KN; placing the pressed blank on a mesh belt of a sintering furnace for sintering, wherein the sintering temperature is 1120 ℃; placing the sintered blank with the groove surface facing downwards into a press for shaping, wherein the shaping pressure is 80-170T; placing the shaped semi-finished belt pulley on a tool, and brushing burrs with a brush; turning an inner hole of the deburred semi-finished product and tapping by using a tapping machine; blackening the machined belt pulley; detecting a belt pulley; heating the oil to 120 ℃ of 100 ℃ and keeping the temperature for 30min, then cooling to 95 ℃, and putting the belt pulley into the oil bath; and packaging the finished belt pulley. The manufacturing process is simple, the manufacturing process is environment-friendly, the labor intensity is reduced, and the cost is saved.
Description
Technical Field
The invention belongs to the technical field of belt pulley production processes, and particularly relates to a powder metallurgy processing process suitable for a VVT (variable valve timing) engine belt pulley.
Background
The Variable Valve Timing (VVT) technology is widely used in modern automobiles, and increases the coefficient of charge by increasing the intake charge, and thus increases the torque and power of the engine, thereby improving the dynamic performance and economy of the engine. The belt pulley is also an important transmission part in the VVT engine, the manufacturing process of the traditional belt pulley adopts a casting process to manufacture a blank, the blank is easy to generate the defect of dynamic unbalance at the stage, the blank is machined into a finished product by mechanical cutting, the tooth profile needs to be cut tooth by tooth, the machining is difficult, the precision is low, the production efficiency is low, the material utilization rate is low, the manufacturing cost is high, and the belt pulley is not suitable for batch production.
Disclosure of Invention
The invention provides a powder metallurgy processing technology suitable for a VVT engine belt pulley, which has the advantages of simple working procedure, uniform internal structure of the produced product, stable performance and high material utilization rate, and is suitable for mass production.
The invention provides a powder metallurgy processing technology suitable for a VVT (variable valve timing) engine belt pulley, which sequentially comprises the following steps of:
s1, mixing powder: putting various raw materials in a belt pulley metallurgical formula into a mixer according to the formula ratio for powder mixing treatment;
s2, pressing: heating the press to above 40 ℃, placing the mixed powder into the press, pressing at the pressure of 1650 and 1800KN, and keeping the pressure for 0.1S;
s3, sintering: placing the pressed blank on a mesh belt of a sintering furnace for sintering, wherein the sintering temperature is 1120 ℃;
s4, shaping: placing the sintered blank with the groove surface facing downwards into a press machine for pressing, wherein the shaping pressure is 80-170T, and the section difference is 31.5 mm;
s5, bristle needling: placing the shaped semi-finished belt pulley on a tool, brushing burrs by using a brush, wherein the rotating speed of the brush is 2440r/min, and the boss surface is 1000-; the groove surface is 700 and 900 mS;
s6, machining: turning an inner hole of the deburred semi-finished product and tapping by using a tapping machine;
s7, oiling and blackening: conveying the machined belt pulley to a continuous furnace for blackening or a pit furnace for blackening;
s8, full inspection: detecting whether the appearance of the belt pulley is rusted or not, detecting color difference, and detecting whether cracks and pressure damages exist in local parts, and using a magnifier to detect whether tapping is missed or not in the threaded hole, if tapping is not repeated;
s9, heating and oil immersion, namely heating the oil to 120 ℃ at 100 ℃ for 30min, then cooling to 95 ℃ and putting into a belt pulley for oil immersion;
and S10, packaging the finished belt pulley.
Preferably, the mixer is a biconical mixer, and the powder mixing time is 60 min.
Preferably, the press is a 1000T press of German Dalster, the powder filling height is 2 times of the difference of each section of the belt pulley, and the powder filling is carried out in a suction type powder filling mode.
Preferably, the sintering furnace adopts a German Miller furnace, the mesh belt speed of the sintering furnace is 140-.
Preferably, the temperature of the oil removal area of the continuous furnace is gradually increased according to 180 ℃, 240 ℃ and 350 ℃, and the temperature of the blackening area is 570 ℃.
Preferably, the temperature of the pit furnace is set to 350 ℃/60min, 400 ℃/60min, 500 ℃/40min, 520 ℃/30min, 560 ℃/120min, 450 ℃/40min and 300 ℃/30min, and the pit furnace is discharged after being cooled to below 200 ℃.
The invention has the beneficial effects that: the hardness of the VVT belt pulley manufactured by the process is HRB88-92, and the density of the adopted reduced iron powder reaches 7.2g/cm3Simple manufacturing process and manufacturing processEnvironmental protection, reduced labor intensity and saved cost.
Drawings
FIG. 1 is a front view of a pulley made by the process of the present invention;
FIG. 2 is a cross-sectional view of a pulley made by the process of the present invention.
The attached drawings are marked as follows:
1. shaft hole, 2, locating hole, 3, screw hole, 4, gear.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and should not be construed as limiting the scope of the invention.
Examples
Referring to fig. 1, the pulley to be processed in this embodiment is shown in fig. 1, and includes a shaft hole 1, a positioning hole 2, 5 threaded holes 3, and a plurality of gears 4 uniformly distributed. Referring to FIG. 2, the difference d of the open end section is 31.25mm, the flatness of the assembly surface is 0.04mm, the cylindricity of the gear is 0.07mm, and the density is not less than 6.8g/cm3Hardness HRB80-100 and is a thin-walled part.
The metallurgical formula for processing the belt pulley consists of the following components in percentage by mass: 0.7 to 1 percent of carbon, 1.1 to 1.5 percent of copper powder, 0.5 to 0.75 percent of lubricant, 0.1 to 0.5 percent of cutting agent, 12 to 15 ml/hundred kilograms of engine oil and the balance of iron powder.
The powder metallurgy processing technology for processing the belt pulley comprises the following steps:
s1, mixing powder: various raw materials in the belt pulley metallurgical formula are placed in a double-cone mixer according to the formula proportion for powder mixing treatment, and the powder mixing time is 60 min.
S2, pressing: heating the press to above 40 ℃, placing the mixed raw material into a charging barrel of the press, filling the powder to a height 2 times of the difference of the sections of the belt pulley, such as 31.25mm, the powder filling height is 62.5mm, filling the raw material into the cavity through a material-pushing shoe, and adopting a method that the pressing density is uniform, and the belt pulley belongs to a thin-wall partPowder filling in a suction type powder filling mode, namely powder shortage filling, powder filling backing of a material pushing shoe is completed, a middle mold floats upwards, the raw materials fall due to shaking, the density distribution of the powder shortage filling can be adjusted, a single high-density area is avoided, pressing is carried out under the pressure of 1650 plus 1800KN, the pressure maintaining time is 0.1S, the weight of a pressed blank is 363g, and the density of a face is 6.8-6.9g/cm3The density of the teeth is 6.9-7.0g/cm3The 1000T press of German Dalster.
S3, sintering: placing the pressed blank on a mesh belt of a sintering furnace for sintering, wherein the sintering temperature is 1120 ℃; the sintering furnace adopts a German Muller furnace, the mesh belt speed of the sintering furnace is 140-.
S4, shaping: and (3) pressing the groove surface of the sintered blank downwards in a 500T Guobian press, wherein the shaping pressure is 80-170T, the section difference is 31.25mm, the placing position and the direction of a belt pulley must be ensured in the shaping process, and the flatness of an assembly surface and the cylindricity of a workpiece are ensured after shaping is finished.
S5, bristle needling: placing the shaped semi-finished belt pulley on a tool, brushing burrs by using a brush, wherein the rotating speed of the brush is 2440r/min, and brushing the boss surface for 1000-1200 ms; the groove surface brush is 700 ms and 900 ms;
s6, machining: turning inner holes, namely a positioning hole 2 and a threaded hole 3, of the deburred semi-finished product, and tapping by using a tapping machine, namely tapping the threaded hole 3;
s7, oiling and blackening: conveying the machined belt pulley to a continuous furnace for blackening or a pit furnace for blackening; the temperature of the oil removing area of the continuous furnace is gradually increased according to 180 ℃, 240 ℃ and 350 ℃, the temperature of the blackening area is 570 ℃, and the flow of water vapor is 18-23m3The pressure is 0.3Mpa, the mesh belt speed is 6cm/min, and nitrogen is introduced after the air enters and exits, so that the air is prevented from entering. Setting the temperature of the pit furnace to 350 ℃/60min, 400 ℃/60min, 500 ℃/40min, 520 ℃/30min, 560 ℃/120min, 450 ℃/40min and 300 ℃/30min, cooling to below 200 ℃ and discharging. The hardness of the belt pulley after blackening is HRB88-92, and the density is more than 6.8g/cm3。
S8, full inspection: detecting whether the appearance of the belt pulley is rusted or not, detecting color difference, and detecting whether cracks and pressure damages exist in local parts, and using a magnifier to detect whether tapping is missed or not in the threaded hole, if tapping is not repeated;
s9, heating and oil immersion, namely heating the oil to 120 ℃ at 100 ℃ for 30min, then cooling to 95 ℃ and putting into a belt pulley for oil immersion;
and S10, packaging the finished belt pulley.
Claims (6)
1. A powder metallurgy processing technology suitable for VVT engine belt pulleys is characterized by sequentially comprising the following steps:
s1, mixing powder: putting various raw materials in a belt pulley metallurgical formula into a mixer according to the formula ratio for powder mixing treatment;
s2, pressing: heating the press to above 40 ℃, placing the mixed powder into the press, pressing at the pressure of 1650 and 1800KN, and keeping the pressure for 0.1S;
s3, sintering: placing the pressed blank on a mesh belt of a sintering furnace for sintering, wherein the sintering temperature is 1120 ℃;
s4, shaping: placing the sintered blank with the groove surface facing downwards into a press for shaping, wherein the shaping pressure is 80-170T, and the section difference is 31.25 mm;
s5, bristle needling: placing the shaped semi-finished belt pulley on a tool, brushing burrs by using a brush, wherein the rotating speed of the brush is 2440r/min, and the boss surface is 1000-; the groove surface is 700 and 900 mS;
s6, machining: turning an inner hole of the deburred semi-finished product and tapping by using a tapping machine;
s7, oiling and blackening: conveying the machined belt pulley to a continuous furnace for blackening or a pit furnace for blackening;
s8, full inspection: detecting whether the appearance of the belt pulley is rusted or not, detecting color difference, and detecting whether cracks and pressure damages exist in local parts, and using a magnifier to detect whether tapping is missed or not in the threaded hole, if tapping is not repeated;
s9, heating and oil immersion, namely heating the oil to 120 ℃ at 100 ℃ for 30min, then cooling to 95 ℃ and putting into a belt pulley for oil immersion;
and S10, packaging the finished belt pulley.
2. The powder metallurgy process for manufacturing VVT engine pulleys of claim 1, wherein: the mixer is a biconical mixer, and the powder mixing time is 60 min.
3. The powder metallurgy process for manufacturing VVT engine pulleys of claim 1, wherein: the press is a 1000T press of German Dalster, the powder filling height is 2 times of the difference of each section of the belt pulley, and the powder filling is carried out by adopting a suction type powder filling mode.
4. The powder metallurgy process for manufacturing VVT engine pulleys of claim 1, wherein: the sintering furnace adopts a German Muller furnace, the mesh belt speed of the sintering furnace is 140-.
5. The powder metallurgy process for manufacturing VVT engine pulleys of claim 1, wherein: the temperature of the oil removal area of the continuous furnace is gradually increased according to 180 ℃, 240 ℃ and 350 ℃, and the temperature of the blackening area is 570 ℃.
6. The powder metallurgy process for manufacturing VVT engine pulleys of claim 1, wherein: setting the temperature of the pit furnace to 350 ℃/60min, 400 ℃/60min, 500 ℃/40min, 520 ℃/30min, 560 ℃/120min, 450 ℃/40min and 300 ℃/30min, cooling to below 200 ℃ and discharging.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010808366.7A CN111842901A (en) | 2020-08-12 | 2020-08-12 | Powder metallurgy processing technology suitable for VVT engine belt pulley |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010808366.7A CN111842901A (en) | 2020-08-12 | 2020-08-12 | Powder metallurgy processing technology suitable for VVT engine belt pulley |
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| CN111842901A true CN111842901A (en) | 2020-10-30 |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101249562A (en) * | 2008-03-26 | 2008-08-27 | 浙江中平粉末冶金有限公司 | Powder metallurgy prescription and technique |
| WO2013127905A1 (en) * | 2012-02-29 | 2013-09-06 | Höganäs Ab (Publ) | Pm automotive component and its manufacture |
| JP2014240518A (en) * | 2013-06-12 | 2014-12-25 | 住友電工焼結合金株式会社 | Method of hole-sealing treatment of sintered member |
| CN104759614A (en) * | 2015-01-28 | 2015-07-08 | 安徽恒均粉末冶金科技股份有限公司 | Belt pulley powder metallurgy formulation and process |
| CN105728710A (en) * | 2016-03-24 | 2016-07-06 | 扬州保来得科技实业有限公司 | Automobile EPS (electric power steering) spiral belt pulley |
| CN107816532A (en) * | 2017-11-22 | 2018-03-20 | 江苏智造新材有限公司 | A kind of lubricating pump of automobile belt pulley and preparation method thereof |
| CN107931618A (en) * | 2017-11-18 | 2018-04-20 | 台州鹏环机械有限公司 | A kind of production technology of timing belt pulley |
| CN108705088A (en) * | 2018-07-23 | 2018-10-26 | 江苏智造新材有限公司 | A kind of automobile VVT dry-type belts wheel stator and preparation method thereof |
| WO2019047031A1 (en) * | 2017-09-05 | 2019-03-14 | 戴文凤 | Belt pulley powder metallurgy method |
-
2020
- 2020-08-12 CN CN202010808366.7A patent/CN111842901A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101249562A (en) * | 2008-03-26 | 2008-08-27 | 浙江中平粉末冶金有限公司 | Powder metallurgy prescription and technique |
| WO2013127905A1 (en) * | 2012-02-29 | 2013-09-06 | Höganäs Ab (Publ) | Pm automotive component and its manufacture |
| JP2014240518A (en) * | 2013-06-12 | 2014-12-25 | 住友電工焼結合金株式会社 | Method of hole-sealing treatment of sintered member |
| CN104759614A (en) * | 2015-01-28 | 2015-07-08 | 安徽恒均粉末冶金科技股份有限公司 | Belt pulley powder metallurgy formulation and process |
| CN105728710A (en) * | 2016-03-24 | 2016-07-06 | 扬州保来得科技实业有限公司 | Automobile EPS (electric power steering) spiral belt pulley |
| WO2019047031A1 (en) * | 2017-09-05 | 2019-03-14 | 戴文凤 | Belt pulley powder metallurgy method |
| CN107931618A (en) * | 2017-11-18 | 2018-04-20 | 台州鹏环机械有限公司 | A kind of production technology of timing belt pulley |
| CN107816532A (en) * | 2017-11-22 | 2018-03-20 | 江苏智造新材有限公司 | A kind of lubricating pump of automobile belt pulley and preparation method thereof |
| CN108705088A (en) * | 2018-07-23 | 2018-10-26 | 江苏智造新材有限公司 | A kind of automobile VVT dry-type belts wheel stator and preparation method thereof |
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