CN101619762A - Cold spinning belt pulley and fabricating method and fabricating equipment thereof - Google Patents

Cold spinning belt pulley and fabricating method and fabricating equipment thereof Download PDF

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Publication number
CN101619762A
CN101619762A CN200910101737A CN200910101737A CN101619762A CN 101619762 A CN101619762 A CN 101619762A CN 200910101737 A CN200910101737 A CN 200910101737A CN 200910101737 A CN200910101737 A CN 200910101737A CN 101619762 A CN101619762 A CN 101619762A
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China
Prior art keywords
spinning
wheel
spinning machine
belt pulley
patrix
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Granted
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CN200910101737A
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Chinese (zh)
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CN101619762B (en
Inventor
木寿金
余秋华
洪军
张祖银
王显安
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Wenzhou Nanya Automobile Accessories Co Ltd
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Wenzhou Nanya Automobile Accessories Co Ltd
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Publication of CN101619762B publication Critical patent/CN101619762B/en
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Abstract

The invention relates to a cold spinning one-step coaxial multi-wedge type belt pulley which comprises a rim, a spoke and a hub, wherein the rim is provided with a plurality of multi-wedge type V-shaped grooves, effective diameter center of each V-shaped groove is concentric with axle hole center of the hub, each V-shaped groove is in bilateral symmetry, and the centre line of each V-shaped groove is vertical to the centre axle line of the hub, annular grooves are arranged among the rim, the spoke and the hub, the spoke is provided with a plurality of arc grooves, and the rim, the spoke and the hub are integrally formed on a spinning machine by using a steel plate in a cold spinning way. The cold spinning one-step coaxial multi-wedge type belt pulley has good softness of a flat belt pulley and large drive power of a V-shaped belt pulley, can absorb impaction and vibration, and is quieter than that of chain and gear drive with little noise. The invention also provides a fabricating method and fabricating equipment of the product.

Description

A kind of cold spinning belt pulley and manufacture method thereof and manufacturing equipment
Technical field
The present invention relates to a kind of cold spinning belt pulley, relate in particular to a kind of single-stage coaxle multi-wedge type pulley and method for processing and process equipment.
Background technique
Belt pulley is a modal transmission part in the mechanical transmission, generally partly is made up of wheel rim, former and wheel hub three, and type of belt drive such as flat belt transmission and V belt transmission are arranged.The flat belt transmission pulley, having overload can skid, protection safe in utilization, advantage such as flexible good, when velocity ratio is inaccurate, precision is not high, and service time is long, and flat belt can ownly extend when weather was hot, also can skid the generation power loss.The V-shape belt transmission pulley is provided with many flat rubber belting grooves, has the big advantage of transmission power, but because every belt is independent, be not conjuncted, each root belt stretching rate is different, rub proofness is also different, so the power when using is difficult to reach the power of design standard, precision is not high.
Belt pulley is generally the metal manufacturing, and a kind of traditional method is to adopt foundry engieering, carries out the machining cutting forming by cast iron, cast aluminium and alloy thereof again after casting.Adopt the processing method of casting and cutting, be unfavorable for environmental protection, adding at machine simultaneously needs in the working angles to remove a large amount of metallic material, has not only wasted material but also owing to material inhomogeneous (sand holes, pore etc.) in the casting process, has also needed carry out Balance Treatment after processing.Another kind is to adopt advanced cold spinning technology, the spinning wheel hub belt pulley of domestic production most for the wheel listrium with thin plate through pull and stretch, folding back spinning race, wheel hub is then with making up with the disc welding after the round steel turning.The product of this explained hereafter not only coarse product specification of face of weld contraction internal stress low but also that generation is very big around the weld seam after welding is difficult to eliminate, therefore in use be prone to distortion, welding heat affected zone fracture, influence the stability of usability, simultaneously, this product is because the nonuniformity of weld filler influences the balance quality of belt wheel.
Along with social progress, such as modern product such as Vehicular air-conditioner compressors higher standard and the request are proposed technical performances such as the structure of the belt pulley of its use and precision, therefore need improve the structure and the manufacture method of existing belt pulley, provide highi degree of accuracy, high performance belt pulley, to adapt to the requirement of modern high end product.
Summary of the invention
For overcoming the defective that existing belt pulley exists, the invention provides a kind of high-precision cold spinning belt pulley and processing method and process equipment, to adapt to of the requirement of modern high end product to belt pulley.
Cold spinning belt pulley provided by the present invention is the single-stage coaxle multi-wedge type pulley, comprise wheel rim, spoke and wheel hub, have many multi-wedge type V-type grooves on the described wheel rim, the effective diameter center of each bar V-type groove and the axis hole centres of wheel hub, every V-type groove bilateral symmetry, and its center line and wheel hub central axis are perpendicular, described wheel rim, have circular groove between spoke and the wheel hub three, several curve baths are arranged on the described spoke, described wheel rim, spoke and wheel hub are by steel plate one cold spinning moulding on spinning machine
The manufacture method of cold spinning belt pulley of the present invention comprises: a, shear, b, blanking and punching strike out the circular plate material with the sheet metal of 4-9mm on punch press, in disk with crank press towards centre of location hole; C, on spinning machine, circular sheet material is spun into the wheel hub base substrate of the belt wheel width of cloth with axis hole with special-purpose spinning wheel; D, on spinning machine, the wheel hub base substrate flanging of the belt wheel width of cloth is formed wheel rim and many wedges of spinning tooth with special-purpose spinning wheel; E, will be with many wedges gear hub base substrate at several curve baths of crank press upper punch; The positive and negative of f, usefulness numerically controlled lathe turning wheel hub; G, process inspection; H, the pulley surface of moulding is handled.
Above-mentioned belt pulley is machine shaping on the spinning machine of a special use and the chassis bed, and special-purpose spinning machine converts for existing spinning machine.
Compared with prior art, the present invention has beneficial effect: 1, because the effective diameter center of each bar V-type groove of above-mentioned single-stage coaxle multi-wedge type pulley and the axis hole centres of wheel hub, every V-type groove bilateral symmetry, and its center line and wheel hub central axis center are perpendicular, and wheel rim, spoke and wheel hub are by sheet metal one cold moudling on spinning machine, thereby precision height, running steadily, both had the good advantage of flat tyre wheel ductility, has the big advantage of V belt wheel transmission power simultaneously, can absorb again simultaneously and impact and vibration, quiet than chain and gear transmission running, noise is little.2, adopt the whole spinning wheel hub of thin plate belt pulley, compare with welding processing, the distortion, the fatigue fracture that are brought because of welding have been overcome, improved fatigue strength greatly, simultaneously, the spinning wheel hub has increased the density of material behind spinning, thereby has improved the intensity of part, has satisfied usability; Compare with traditional cast iron belt pulley, have material and economize (saving more than 70%), energy efficient, non-environmental-pollution, the manufacturing efficiency height, cost is low, and the product design that is processed is attractive in appearance, in light weight, rotary inertia is little, balance quality is good, noise is low, absorbs advantages such as the shock and vibration performance is good.3, whole processing on a special spinning machine does not need the multiple clamping mode transfer, realizes a clamping moulding, thereby guarantees the wheel rim of belt pulley and the concentric required precision of wheel hub.The present invention is particularly useful for multiple engineering goods such as automobile, tractor, reaper, air compressor.
The invention will be further described below in conjunction with drawings and Examples.
Description of drawings
Fig. 1 is the structural representation of an embodiment of the present invention single-stage coaxle multi-wedge type pulley.
Fig. 2 is a manufacture method main technique flow chart of the present invention.
Fig. 3 is the structural representation of spinning machine used in the present invention.
Drawing explanation: 01. shear, 02. blanking and punching, 03. spinning, 1,04. spinning 2,05. towards curve bath, 06. car front, 07. car reverse side, 08. surface treatment, 1. patrix compressed oil cylinder, 2. patrix working plate, 3. patrix bearing support, 4. union body, 5. positioning guide column, 6. move up and down guide rail, 7. go up the pressure die jig, 8. move up and down oil cylinder, 9. dextrorotation pinch roller assembly, 10. spinning wheel assembly supporting base, 11. move horizontally oil cylinder, 12. move horizontally guide rail, 13. spinning machine worktable, 14. blanks, 15. push rod, 16. times pressure die jigs, 17. big belt pulleys, 18. the guide pillar positioning plate, 19. left-handed pinch roller assemblies, 20. disks, 21. motor, 22. small belt pulleys, 23. discharging revolving cylinders, 24. wheel rim, 25. spokes, 26. wheel hubs, 27, axis hole, 28. circular grooves, 29. curve baths.
Embodiment
As shown in Figure 1, as an embodiment of the present invention is a kind of single-stage coaxle multi-wedge type pulley, comprise wheel rim 24, spoke 25 and wheel hub 26, have many multi-wedge type V-type grooves 24.1 on the wheel rim 24, axis hole 27 centres of the effective diameter center of each bar V-type groove 24.1 and wheel hub 26, every V-type groove 24.1 bilateral symmetry, and its center line and wheel hub 26 central axis are perpendicular, wheel rim 24, have circular groove 28 between spoke 25 and wheel hub 26 threes, several curve baths 29 are arranged, described wheel rim 24 on the spoke 25, spoke 25 and wheel hub 26 are by steel plate one cold spinning moulding on spinning machine.Present embodiment, the slot pitch of V-type groove 1.1 are 3.65 ± 0.05mm, and groove angle is 40 ° ± 0.5 °.
The foregoing description single-stage coaxle multi-wedge type pulley is machine shaping on the spinning machine of special-purpose 60T three stations and the chassis bed.
Employed spinning machine comprises: by about two spinning wheel assemblies 19,9 and go up pressure die jig 7 and following pressure die jig 16 is formed the belt pulley machining tool; Two spinning wheel assemblies 19 about described, 9 lay respectively at the spinning machine worktable position, the left and right sides and can be by moving up and down oil cylinder 8 and moving up and down guide rail 6 and reaching up and down of moving horizontally oil cylinder 11 and move horizontally that guide rail 12 forms moves horizontally assembly and drive it and reach horizontal motion up and down, left-handed pinch roller assembly 19 and dextrorotation pinch roller assembly 9 guide rail 6 that moves up and down by separately respectively place on separately the spinning wheel assembly supporting seat 10, the supporting seat 10 of two spinning wheel assemblies places on the spinning machine worktable 13 by moving horizontally guide rail 12 respectively, left-handed pinch roller assembly 19 and dextrorotation pinch roller assembly 9 are done above-below direction under driving and are moved moving up and down oil cylinder 8 respectively, move horizontally under driving moving horizontally oil cylinder 11, the oil cylinder of two horizontal motion is to promote spinning wheel to do substantially horizontal spinning blank, screw out multiple wedge slot, the oil cylinder of (vertically) direction motion is used to proofread and correct wheel hub Vertical direction position about in the of two; Describedly go up that pressure die jig 7 places the central position of spinning machine worktable 13 and by four positioning guide column 5, guide pillar positioning plate 18, patrix working plate 2, patrix compressed oil cylinder 1, patrix bearing support 3, the patrix operating component that the union body 4 of pressure die jig and patrix bearing support is formed in the connection drives it and moves up and down, the lower end of four positioning guide column 5 is fixed on the spinning machine worktable 13, the upper end of four positioning guide column 5 is fixing by guide pillar positioning plate 18, patrix working plate 2 also can move up and down along positioning guide column 5 by placing on four positioning guide column 5 of sliding sleeve 2.1 activities, patrix compressed oil cylinder 1 is fixed on the guide pillar positioning plate 18, patrix bearing support 3 is fixed on the patrix working plate 2, last pressure die jig 7 is by union body 4, patrix bearing support 3 is connected with patrix compressed oil cylinder 1, and last pressure die jig 7 moves up and down along four positioning guide column 5 under the effect of patrix compressed oil cylinder 1; Described pressure die jig 16 down places the central position of spinning machine worktable 13 and drives it by the counterdie operating component that motor 21 and driving mechanism thereof are formed and rotates, and following pressure die jig 16 places on the transmission shaft of driving mechanism.The present embodiment driving mechanism comprises small belt pulley 22 and big belt pulley 17 and the transmission shaft that is connected with big belt pulley.
Unload from board for ease of finished product completion of processing, the discharging rotary cylinder 23 of an energy 360 degree rotations is set up in the bottom of described spinning machine worktable 13, discharging rotary cylinder 23 connects a disk 20 moving up and down, and disk 20 is connected with four push rods 15 installing in following pressure die jig 16.Little R pyramid is with in being shaped as of employed spinning wheel mould, and frustum inclined-plane and spinning machine spindle parallel, frustum tapering are 56 °, and the axle of frustum becomes 28 ° with the spinning machine main shaft, and the wheel hub that processes like this is vertical with disc.The present embodiment spinning machine is three stations, and two spinning wheels divide the preface feeding, is controlled by computer.
Rotary pressure technology is mainly adopted in the manufacturing of cold spinning belt pulley (processing), the main technique flow process is as shown in Figure 2: a, shear (as process flow diagram 01), b, blanking and punching, the sheet metal of 4-9mm is struck out the circular plate material on punch press, in disk with crank press towards centre of location hole (as process flow diagram 02); C, on the 60T spinning machine, circular sheet material is spun into the wheel hub base substrate (as process flow diagram 03) of the belt wheel width of cloth with axis hole with special-purpose spinning wheel (mould); D, on the 60T spinning machine, the wheel hub base substrate flanging of the belt wheel width of cloth is formed wheel rim and many wedges of spinning tooth (as process flow diagram 04) with special-purpose spinning wheel (mould); E, will be with many wedges gear hub base substrate at several curve baths of crank press upper punch (as process flow diagram 05); The positive and negative (as process flow diagram 06,07) of f, usefulness numerically controlled lathe turning wheel hub; G, process inspection; H, the pulley surface of moulding is handled (as process flow diagram 08).The spindle speed of described spinning machine is 350r-400r/min, and the depth of cut of spinning wheel (mould) is 0.8-1.2mm/S, and pressure is 15-17Mpa, the temperature 30-70 of hydraulic oil ℃.The spinning wheel material of present embodiment selects alloy die steel, through heat treatment quenching and tempering, quenching.

Claims (8)

1, a kind of cold spinning belt pulley, it is characterized in that described belt pulley is the single-stage coaxle multi-wedge type pulley, comprise wheel rim (24), spoke (25) and wheel hub (26), have many multi-wedge type V-type grooves (24.1) on the described wheel rim (24), axis hole (27) centres of the effective diameter center of each bar V-type groove (24.1) and wheel hub (26), every V-type groove (24.1) bilateral symmetry, and its center line and wheel hub central axis are perpendicular, described wheel rim (24), have circular groove (28) between spoke (25) and wheel hub (26) three, several curve baths (29) are arranged on the described spoke (25), described wheel rim (24), spoke (25) and wheel hub (26) are by steel plate one cold spinning moulding on spinning machine
2, cold spinning belt pulley according to claim 1, the slot pitch that it is characterized in that described V-type groove (1.1) is 3.65 ± 0.05mm, groove angle is 40 ° ± 0.5 °.
3, the manufacture method of a kind of claim 1 or 2 described cold spinning belt pulleys, it is characterized in that described manufacture method comprises: a, shear, b, blanking and punching strike out the circular plate material with the sheet metal of 4-9mm on punch press, in disk with crank press towards centre of location hole; C, on spinning machine, circular sheet material is spun into the wheel hub base substrate of the belt wheel width of cloth with axis hole with special-purpose spinning wheel; D, on spinning machine, the wheel hub base substrate flanging of the belt wheel width of cloth is formed wheel rim and many wedges of spinning tooth with special-purpose spinning wheel; E, will be with many wedges gear hub base substrate at several curve baths of crank press upper punch; The positive and negative of f, usefulness numerically controlled lathe turning wheel hub; G, process inspection; H, the pulley surface of moulding is handled.
4, the manufacture method of cold spinning belt pulley according to claim 3, the spindle speed that it is characterized in that described spinning machine is 350r-400r/min, and the depth of cut of spinning wheel is 0.8-1.2mm/S, and pressure is 15-17Mpa, the temperature 30-70 of hydraulic oil ℃.
5, a kind ofly be used for the spinning machine that claim 1 or 2 described cold spinning belt pulleys are made, it is characterized in that comprising: by about two spinning wheel assemblies (19,9) and go up pressure die jig (7) and following pressure die jig (16) is formed the belt pulley machining tool; Two spinning wheel assemblies (19 about described, 9) lay respectively at the spinning machine worktable position, the left and right sides and can be by moving up and down oil cylinder (8) and moving up and down guide rail (6) and reaching up and down of moving horizontally oil cylinder (11) and move horizontally that guide rail (12) forms moves horizontally assembly and drive it and reach horizontal motion up and down, left-handed pinch roller assembly (19) and dextrorotation pinch roller assembly (9) guide rail (6) that moves up and down by separately respectively place on separately the spinning wheel assembly supporting seat (10), the supporting seat of two spinning wheel assemblies (10) places on the spinning machine worktable (13) by moving horizontally guide rail (12) respectively, and left-handed pinch roller assembly (19) and dextrorotation pinch roller assembly (9) are moving up and down oil cylinder (8) respectively, move horizontally under the effect of oil cylinder (11) and do up and down or horizontal motion; Describedly go up that pressure die jig (7) places the central position of spinning machine worktable (13) and by four positioning guide column (5), guide pillar positioning plate (18), patrix working plate (2), patrix compressed oil cylinder (1), patrix bearing support (3), the patrix operating component that the union body (4) of pressure die jig and patrix bearing support is formed in the connection drives it and moves up and down, the lower end of four positioning guide column (5) is fixed on the spinning machine worktable (13), the upper end of four positioning guide column (5) is fixing by guide pillar positioning plate (18), four positioning guide column (5) that place that patrix working plate (2) is movable upward also can move up and down along positioning guide column (5), patrix compressed oil cylinder (1) is fixed on the guide pillar positioning plate (18), patrix bearing support (3) is fixed on the patrix working plate (2), last pressure die jig (7) is by union body (4), patrix bearing support (3) is connected with patrix compressed oil cylinder (1), and last pressure die jig (7) moves up and down along four positioning guide column (5) under the effect of patrix compressed oil cylinder (1); Described pressure die jig (16) down places the central position of spinning machine worktable (13) and drives it by the counterdie operating component that motor (21) and driving mechanism thereof are formed and rotates, and following pressure die jig (16) places on the transmission shaft of driving mechanism.
6, the spinning machine of cold spinning belt pulley according to claim 5, the discharging rotary cylinder (23) that an energy 360 degree rotate is set up in the bottom that it is characterized in that described spinning machine worktable (13), discharging rotary cylinder (23) connects a disk moving up and down (20), and disk (20) is connected with four push rods (15) of installing in following pressure die jig (16).
7, the spinning machine of cold spinning belt pulley according to claim 5 is characterized in that being shaped as of described spinning wheel be with little R pyramid, and frustum inclined-plane and spinning machine spindle parallel, frustum tapering are 56 °, and the axle of frustum becomes 28 ° with the spinning machine main shaft.
8, the spinning machine of cold spinning belt pulley according to claim 6 is characterized in that being shaped as of described spinning wheel be with little R pyramid, and frustum inclined-plane and spinning machine spindle parallel, frustum tapering are 56 °, and the axle of frustum becomes 28 ° with the spinning machine main shaft.
CN2009101017371A 2009-08-11 2009-08-11 Cold spinning belt pulley and fabricating method and fabricating equipment thereof Expired - Fee Related CN101619762B (en)

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CN101619762B CN101619762B (en) 2011-11-23

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CN102248375A (en) * 2011-06-24 2011-11-23 江西华伍制动器股份有限公司 Pulley wheel manufacturing process
CN102729016A (en) * 2011-04-07 2012-10-17 协祥机械工业股份有限公司 Wheel axle manufacturing method
CN103707009A (en) * 2013-12-10 2014-04-09 安徽耀强精轮机械有限公司 Integral belt pulley spinning process
CN103990681A (en) * 2014-05-22 2014-08-20 上海交通大学 Vertical spinning mechanism adjustable in two roller swing directions
CN104476113A (en) * 2014-10-29 2015-04-01 苏州市金德誉精密机械有限公司 Bottom wheel machining technology
CN104492942A (en) * 2014-11-10 2015-04-08 南通福乐达汽车配件有限公司 Special spinning die assembly for outer wheel of multi-wedge belt pulley of thickened crankshaft vibration damper
CN105333103A (en) * 2015-11-18 2016-02-17 杭州禾呈机械有限公司 Two-grade coaxial multi-wedge type high-precision spinning belt wheel and manufacturing method thereof
CN105345416A (en) * 2015-11-24 2016-02-24 陈硕 Positioning mechanism for belt pulley and mechanism manufacturing method
CN105583544A (en) * 2016-03-09 2016-05-18 福州职业技术学院 Spin pulley welding machine tool
CN106400287A (en) * 2016-12-10 2017-02-15 无锡银联齿轮传动机械有限公司 Single-thread-inlet single-tube yarn feeder
CN106435990A (en) * 2016-12-10 2017-02-22 无锡银联齿轮传动机械有限公司 Roller drum structure of single-tube yarn feeder
CN106637648A (en) * 2016-12-10 2017-05-10 无锡银联齿轮传动机械有限公司 Single-tube yarn feeder with arc-shaped top
CN106757726A (en) * 2016-12-10 2017-05-31 无锡银联齿轮传动机械有限公司 Double inlet wire single tube Yarn feeders
CN108971903A (en) * 2018-08-15 2018-12-11 芜湖西诺普汽车零部件科技有限公司 A kind of method that wheel is made in wheel spoke barrel wheel compacting
CN110513464A (en) * 2019-08-20 2019-11-29 浙江东星汽车部件有限公司 The multiple tooth high-intensitive spinning belt pulley of one kind and moulding process

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US5979203A (en) * 1998-02-19 1999-11-09 Radocaj; Mijo Apparatus for spin-forming a circular body from a flat blank metal workpiece
CN100482977C (en) * 2006-10-25 2009-04-29 木寿金 Two-stage coaxle multi-wedge type pulley and processing technology and equipment
CN201078459Y (en) * 2007-08-07 2008-06-25 柳州市龙杰汽车配件有限责任公司 Spinning belt roller assembly
CN100493757C (en) * 2007-10-30 2009-06-03 华南理工大学 Belt wheel jolleying method and equipment
CN201493409U (en) * 2009-08-11 2010-06-02 温州市南亚汽车配件有限公司 Spinning machine of cold spinning belt pulley

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CN102729016A (en) * 2011-04-07 2012-10-17 协祥机械工业股份有限公司 Wheel axle manufacturing method
CN102248375A (en) * 2011-06-24 2011-11-23 江西华伍制动器股份有限公司 Pulley wheel manufacturing process
CN103707009A (en) * 2013-12-10 2014-04-09 安徽耀强精轮机械有限公司 Integral belt pulley spinning process
CN103990681A (en) * 2014-05-22 2014-08-20 上海交通大学 Vertical spinning mechanism adjustable in two roller swing directions
CN103990681B (en) * 2014-05-22 2016-02-17 上海交通大学 The vertical spinning mechanism that running roller two swaying direction is adjustable
CN104476113A (en) * 2014-10-29 2015-04-01 苏州市金德誉精密机械有限公司 Bottom wheel machining technology
CN104492942A (en) * 2014-11-10 2015-04-08 南通福乐达汽车配件有限公司 Special spinning die assembly for outer wheel of multi-wedge belt pulley of thickened crankshaft vibration damper
CN105333103A (en) * 2015-11-18 2016-02-17 杭州禾呈机械有限公司 Two-grade coaxial multi-wedge type high-precision spinning belt wheel and manufacturing method thereof
CN105345416A (en) * 2015-11-24 2016-02-24 陈硕 Positioning mechanism for belt pulley and mechanism manufacturing method
CN105583544A (en) * 2016-03-09 2016-05-18 福州职业技术学院 Spin pulley welding machine tool
CN105583544B (en) * 2016-03-09 2018-04-27 福州职业技术学院 A kind of spin pulley welding machine tool
CN106400287A (en) * 2016-12-10 2017-02-15 无锡银联齿轮传动机械有限公司 Single-thread-inlet single-tube yarn feeder
CN106435990A (en) * 2016-12-10 2017-02-22 无锡银联齿轮传动机械有限公司 Roller drum structure of single-tube yarn feeder
CN106637648A (en) * 2016-12-10 2017-05-10 无锡银联齿轮传动机械有限公司 Single-tube yarn feeder with arc-shaped top
CN106757726A (en) * 2016-12-10 2017-05-31 无锡银联齿轮传动机械有限公司 Double inlet wire single tube Yarn feeders
CN108971903A (en) * 2018-08-15 2018-12-11 芜湖西诺普汽车零部件科技有限公司 A kind of method that wheel is made in wheel spoke barrel wheel compacting
CN110513464A (en) * 2019-08-20 2019-11-29 浙江东星汽车部件有限公司 The multiple tooth high-intensitive spinning belt pulley of one kind and moulding process

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