Screw machine performance
Production technology of screw is determined according to screw standards required optional equipment required for production process, screw machine is in the manufacture of screws screws cold formed the main equipment, heavy slab forming light nail screw needs to the appropriate thread rolling machine for processing of screw thread pattern. Shixi precision performance:
1, multiple-station be able to separately adjust the mould launch trip, force introduced and patented design of main slider back with synchronized precision technology;
2, with it's super short in the anticipate, long expected, complete features on a machine at the same time;
3, launched the die function fully adjustable;
4, diversification of the clamp body, large-mouth, pulling and inserting pliers, universal tilting, and each can separately adjust the clamps;
5, machine tools, the base of the fuselage used cast iron, good damping properties;
6, main slider trunk forms, made from cast steel material used, good rigidity, high guiding accuracy;
7, electric control and pneumatic control simple and practical.
8, cam, twin-cam design and manufacturing process is unique, durable, reliable operation;
Production technology of screw
Production technology of screw (a)-annealing
First, the intention: heat the wire to the right temperature, adhere to, and then cools to adjust the crystalline arrangement, the whereabouts of hardness, improved wire processing at room temperature.
Second, all the processes:
(A), feed: hanging furnace demand disposal of products, focusing on the lid should be tightly. Common furnace can also dispose of 7 volumes (about 1.2 tonnes/volume).
(Ii), the temperature: the temperature inside the furnace slightly (3-4 hour) temperature rose to rule.
(C), insulation: ingredients for 1018, 1022 wire at 680 ° c-715 ° c under 4-6h, raw materials for the 10B21,1039,CH38F wire at 740-760 ° c under 5.5-7.5 h.
(D), the temperature: the temperature inside the furnace slightly (3-4 hour) dropped to 550 ° c, then furnace cool down to room temperature.
Third, the quality control:
1, hardness: raw material hardness after annealing for 1018, 1022, wire HV120-170, raw materials for carbon wire hardness after annealing for HV120-180.
2 appearance: no oxide film and decarbonization of appearance symptoms.
Production technology of screw (b)-pickling
First, the intention: to get rid of wire rod surface oxide film, and metal surface a layer of phosphate film to cut and cold heading and forming wire lines and other processing in the course of, abrasions to the die.
Second, all the processes:
(A), acid: the entire disc worth parting immersion at room temperature, concentrations of 20-25% hydrochloride and three slots for a few minutes, the intention is to get rid of wire rod surface oxide film.
(B) water: Elimination of wire hydrochloride appearance of corrosion products.
(C), oxalic acid: Add metal activity, so the next process to generate skin more delicate.
(D) disposal, skin film: immerse the phosphate, steel surface and chemical disposal of liquid touch, dissolved iron and steel building of insoluble compounds (for example, Zn2Fe (Po4) 2 · 4H2o), pose a membrane attached to the steel surface.
(V), clear water: Elimination of skin surface residues.
(Vi), lubricants: due to the phosphate coating is not very low friction coefficient, cannot be given plenty of processing lubrication, metal SOAP (such as sodium soaps) reactions constitute a solid layer of metal soaps, you can add its lubricating function.
Production technology of screw (c)-wire
First, the intention: cold-drawn to the desired diameter. Practical alignment of local products can be rough (peeling) and from two periods.
Second, all the processes
After pickling, after cold-drawn wire machine to the required diameter. Suitable for large wire screw, nut, tooth article.
Production technology of screw (d)-
First, the intention: the wire by cold cast (or hot casting), to reach the shape and length of the semi-finished products (or thickness).
Second, all the processes:
1, hex bolts (four four flush or three moulds three wash)
(1) the smuggling: one-way move after moving scissors, cutting die-card needed to cut the wire blank.
(2), rush: die stand up after kneading blank blank die, start to take shape, will die after blank after launch.
(3), the second Red: blank enter the second die, die the second kneading, blank is oval-shaped, dies after blank after launch.
(4), three Red: blank enters its third model, kernels cut after six-angle die, blank hex began to pose, after which dies after push the blank into the third die, cutting hex intercept hex form.
2, hex bolts (three die, three wash)
3, screws (normal head shape die two wash)
(1) the smuggling: one-way move after moving scissors, cutting die-card needed to cut the wire blank.
(2), rush: die is fixed, a die head start to take shape, so that the next stroke to thoroughly. When a character streak is product, a die is concave, elliptical tank, when the product is Phillips, a die for the female Quartet grooves.
(3), the second Red: after the rush, rush with all work, die moved to die with two front, two die, forming the end product. Red bar will be blank after following the launch.
Third, hot
1, heating: in heating equipment and blank desired end heated to white-hot, set heating temperature and time according to product specifications. General one following heating three-fourths seconds, 7/8-1 "heat 15 seconds or so.
2, forming: the heating of the blank agile moves to the machine, through the rear seat, fixed die, die hit blank, are formed. Can be adjusted to fit the length of the blank after the interval.
3, beam rods: kneading in beam machine use reduces the product. Hot, also known as red.
Four, nut:
(A), activity-based processes:
1, intercept: by cutting (410) and cut knife (301), cut the wire required blank.
2, rush: the former die (111), red-Cheng Mo (411), rear red stick (211), intercepted on uneven deformation of blank shape and rushed after stick (211) blank will be launched.
3, b Red: clip (611) blank from the flush clamp to the second rush, the former die (112), red-Cheng Mo (412), rear flush rod (412), further blank shaping and strengthening the role of flattening of the first flush and fill angle, after following the flush rod (212) blank will be launched.
4, three Red: clip (612) blank dashed Favorites until three rushed from the second, the former die (113), red-Cheng Mo (413), rear flush rod (213), knead again blank, so that the next flush thoroughly, after following the flush rod (213) blank will be launched.
5, four red: clip (613) embryonic material from three rushed to four flush, the former die (114), red-Cheng Mo (414), rear flush rod (214), the nuts will be thoroughly, and to control the thickness of scrap iron to adjust the nut thickness, after following the flush rod (214) blank will be launched.
6, five red: clip (614) blank dashed clips to five from the four rush by former die (119), stripper plate (507), forming the complete blank punch and thrust under the iron filings into the punching die jen, end cap nut at the end. Nut-head symbol in this process.
Production technology of screw (v)-rolling teeth
First, the intention: forming or tapping run over of semi-finished products to reach the desired thread. Practical alignment bolts (screw) is called the rolling, rolling teeth known as teeth, the nut called tapping.
Second, rolled tooth: rolled tooth is a tooth plate, dental unit of movable property of another activity to move, attack plastic deformation using kneading products, constitute a necessary thread.
The third, tapping: tapping is nuts, using wire tapping tapping, thread required to constitute.
Four, roll: rolling screw wheel corresponding to the tooth is coming in two, which is a change, attack plastic deformation using kneading products, constitute a necessary thread. Rolled tooth normal tooth.
Production technology of screw (f)-thermal disposal
A, heat treatment: depending on the target and the unusual choice of unusual heat disposal methods.
Quenched and tempered steels: quenching and high temperature tempering after (500-650)
Spring steel: quench moderate temperature tempering after (420-520)
Carburizing steel: carburizing and quenching after tempering at low temperature (150-250 ° c)
Low carbon and carbon (alloy) steels after quenching into martensite, tempering temperature rises, his whereabouts rule is strength, plasticity, tolerance increases. But because of low and medium carbon steel with different carbon content, effect of tempering temperature on degree of sensation. So in order to achieve excellence in induction machine, you can say goodbye to adopt the following approach:
(1) low carbon, and alerts reefer mechanics (alloy) steels, quenched and low temperature below 250 ¡æ tempering to achieve low-carbon martensite. In order to advance this type of steel surface wear resistance, as long as the progress of carbon in the surface layers, surface carburizing, common known as carburizing steel layout.
(2), adopt carbon-bearing high-carbon steel, quenched high temperature (500-650 ° c) tempering (otherwise known as quenched and disposed of), so that they can in high plastic case, adhere to the met's strength, General said this type of steel is quenched and tempered steel. If desired strength, whereabouts and prefer plastic and patience, on the lower carbon content of gold-bearing quenching and tempering can be adopted low-temperature tempering, the so-called "ultra high strength steels".
(3), the carbon content is between carbon and high-carbon steel (60,70 steel), as well as a number of high carbon steel (such as 80,90 steel), for the production of spring, in order to assure high elastic limit, to bow limits and fatigue limit, then use quench moderate temperature tempering after.
(4), the decarburization: ferrous materials (steel) appearance of carbon loss. Thermal disposal decarbonization imagery, subtle decarbonization is promised, decarburized layer depth effects of surface hardness. Decarburized layer depth, smaller surface hardness values.
Detailed testing according to GB3098.1
Second, all the processes:
Annealing (Pearlite steel)
1, warm-up disposal: normalizing
High-temperature tempering (Martensitic Steel)
(1), normalizing the intention of grain refinement, extent of Zoster in cut arrangements, and adjust the hardness, easy to machine, after the fire, fine grain steel shafts.
2, quenching: steel body is heated to around 850 ° c quenching, quenching medium based on large steel parts and the hardenability of the steel to be selected, normal to choose water or oil and air hardening. In hardened steel, plastic, large internal stress.
3, tempering:
(1), for making steel with high ductility, resistance and adequate strength, steel 400-500 ℃ high temperature tempering, on temper embrittlement sensitivity of big steel, tempering must be agile to cool, restrain control temper brittleness of the attack.
(2), if the pleading part of rare high-strength, 200 ¡æ tempering, are carbon tempered martensite in arrangements.
(B) and spring steels:
1, quenching: at 830-870 ° c for oil quenching.
2, tempering: at about 420-520 ° c temper, temper troostite made arrangements.
(C), cementite steel:
1, cementite: disposal of a chemical heat, temperature, the activity of a certain chemical element of media-rich, to the exterior steel parts into the c element. Warming (850 ° c) carbonization (890 ° c) dispersion (840 ° c) process
2, quenching: carbon and low alloy carburizing steel, ordinary selection of direct quenching or quenching.
3, tempering: tempering at low temperature to eliminate internal stress, strength of carburized layer and progress and tolerance.
Production technology of screw (g)-surface disposal
Looks disposal species:
Appearance approaches the workpiece surface composition of disposal is a coating process, its intent was assigned to the products look beautiful, the role of anti-corrosion, disposal due to the appearance of the following approaches:
1, plating: bear electroplated parts immersed in a rich deposits of metal compounds in aqueous solution, to current after plating, electroplating metal separation and stacking on the part. Ordinary electroplated galvanized, copper, nickel, chromium, copper and nickel alloys and other, sometimes boiled black (blue), phosphate, also covers.
2, hot-dip galvanized: after the carbon steel parts immersion temperature of approximately 510 ° c dissolves zinc plating bath in the end. Resulted in appearance of Fe-Zn alloy steel parts becoming passivation of zinc outside the product appearance. Hot-dip aluminium is a similar process.
3, mechanical plating: after coating the metal particles to impact product appearance and appearance of coat cold welding products.
Second, quality control:
Electroplating quality to its corrosion-resistant as the paramount measure specification, followed by appearance. Corrosion-resistant product is modelled on the working environment, is set to experimental conditions, to corrosion test. Plating products of controlled quality from the following aspects:
1 appearance:
Product appearance promised to partially bare, charred, rough, bleak, from the skin, and skin and stripes, not agree with pin-point, black slag plating, passivation films had fallen loose, cracked, and signs of acute passivation.
2 plating layer thickness:
Operational life expectancy of the fasteners in the corrosive atmosphere and it is proportional to the thickness of the coating. Economy advocated by the ordinary electroplated coating thickness is 0.00015in~0.0005 in (4~12um).
Hot-dip galvanizing: specification of uniform thickness of 54 UM (title 43 UM diameter ≤ three-eighths), minimum thickness of 43 UM (Title 37 UM diameter ≤ three-eighths).
3, plating dispersed:
Strange choice of stacking approach, coating fasteners outside collection of approaches is also unusual. Electroplating plating metal is not stacked evenly on the peripheral marginal, corner made thicker coating. In tight firmware of thread local, most thick of coating is located thread teeth top, along thread next to surface gradually variable thin, in teeth end of Department stacked most thin, and hot dip plating zinc happened to instead, more thick of coating stacked in within corner and thread bottom, machinery plating of coating metal stacked tendencies and hot dip plating as, but more lubrication and in whole appearance Shang thickness to uniform was more.
4, hydrogen embrittlement:
Fastener in the process of processing and disposal, particularly in the plating in acid washing and alkali washing and subsequent electroplating process, surface absorbs hydrogen atoms, captured by the accumulation of metallic coatings and hydrogen. When the fastener when tightening, assembled local transfer of hydrogen in stress, causes increased pressure beyond the break of base strength and attack small appearance. Hydrogen-rare events and soon into the new composition of the crack. The pressure break-loop-go has always been continuing to fasteners and cracking. General attack in the stress for the first time several hours after the operation.
In order to eliminate the hydrogen embrittlement of intimidation, fastener coated heating as soon as possible after baking so that hydrogen seeping from the coating, baking General 375-4000F (176-190) 3-24 hours.
Due to the mechanical zinc plating on wrong electrolytes, which effectively eliminates hydrogen embrittlement of intimidation. Suppression of hardness is higher than HRC35 due to engineering specifications fastener (inch Gr8, metric grade 10.9 per cent) hot-dip galvanizing. Hydrogen embrittlement of hot-dip galvanized fasteners are rarely attack.
5, adhesion:
With a solid tip and under considerable pressure to cut or tampering. If it is in front of the tip, plating to flake or peel off, exposing the base metal, inadequate adhesion.
Screw appearance defects
Adverse symptoms, begin with simple attack and cause analysis
1, side pain: bad and rushed the second device tuning is nothing wrong.
2, vital: a poor device and adjustable punching machine is nothing wrong.
3, head not round: a selection of punching die is wrong with inadequate or flush forming to round.
4, die crack: die break or die r angle wrong causes the model to be subject to the second scraping.
5, head double: rush formed bad.
6, Flash: poor flush molding, primary is the gap between the flush Rod hole and die too big or red rods are too short cause.
7, split corners: Red needles break or two jumping and playing mode is not.
8, head cracking: on raw materials, or use a die through no fault (such as plate hex washer head used a die), as well as the reasons of the lubricating oil.
Second, analysis of the causes of unhealthy appearance of teeth is easy to attack and run over
1, processing crack: shabby and the conditioner wrong.
2, blunt-tail: the conditioner wrong tooth plates are too old.
3, fire: two large distances, or feeding work right.
4, crooked tails: manipulation of screws from the dental lamina got too tight.
5, tail: tooth wear and conditioner wrong.
6, Asan enough: reducing inappropriate
7, end of thread rolling machine not pick to the stern.
8, tilt rod: correcting block not straightening up.
9, the end of the rough: the tooth pitch is not good.