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Adjustable hand reamer 26-29.5mm29.5-33.5mm33.5-38mm38-44mm44-54

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Essential informationReamer (roll Name: Mechanical Engineering) with one or more cutter teeth to remove machined Kong Biao

 

The rotation of a thin layer of metaltool

 

jiǎodāo

 

[reamer]: a rotary finishing tool with straight or spiral edges, used for reaming or repairing holes

 

purpose

The reamer has one or more cutter teeth, which is used to remove the rotary cutter on the machined surface of the thin metal layer.

Reamer

After the cutter processing after the hole can obtain the exact size and shape.

 

Reamer forReamingThe holes that have been drilled (or expanded) on the workpiece are mainly designed to raise the holeMachining accuracyTo reduce the surface roughness, it is a tool for finishing and semi finishing of holes, and the machining allowance is very small.

 

Reamers used for machining cylindrical bores are commonly used. The reamer used for machining tapered hole is taper reamer, which is less used. According to the use situation, there areHand reamerThe machine reamer can be divided into machine reamer and machine reamerStraight shank reamerTaper shank reamer. The hand is straight handle type.

 

type

Most of the reamer structure is composed of the working part and the shank. The main part of the work is cutting and calibration function, the calibration Department diameter has inverted taper. The handle is used for clamping by the fixture, and the straight handle and the taper handle are divided.

 

According to different purposes can be divided into many kinds of reamer and so on reamer is more standard, some of our standards are commonly used with GB / T1131 hand reamers, GB / T1132Straight shank machine reamerGB / T1139 straight handle MohsCone reamerWait。

Reamer

The reamer is divided into hand reamer and machine reamer according to its usageReamingThe shape is divided into cylindrical and conical reamer. (standard taper reamer has 1:50 taper pin, reamer and reamerMorse taper reamerThere are two types of reamers. The flute of the reamer has straight groove and spiral groove. The commonly used material is high speed steel. Hard alloy insert

 

The hand reamer is made of alloy tool steel (9SiCr), the machine reamer is made of high speed steel (HSS), and the machine reamer is divided into straight shank machine reamer and machine reamerTaper shank machine reamer

 

ReameraccuracyThere are D4, H7, H8, H9 and so onPrecision grade

 

According to the shape of the hinge hole, cylindrical, conical and ladder shaped 3 kinds;

 

Installation clip method, belt handle type and sleeve type two kinds;

 

According to the shape of the alveolar slot, there are two kinds of straight groove and spiral groove

 

A manual reaming general note: 1. workpiece to clamp.2. reaming process, two handed force to balance the.3. reamer out, can not be reversed, because a reamer rear corner, reamer reversal will make chip plug in the back gear and the reamerThe hole wallBetween the hole wall scratches; at the same time, the reamer is easy to wear,.4. reamer is used, to clean, coated with oil, box, so as not to hurt the edge

 

Two. Pay attention to the reaming speed and the amount of cutter when machine hinges (check the manual of metal cutting)

 

Three. Reasonable cooling lubricant must be used in reaming

 

The taper of the guide cone used for hand is smaller, the front angle and back angle are smaller, the blade is sharper, the common blade is narrower, or the guide cone is not.

 

Design points

Determination of reamer diameter and its tolerance

The diameter tolerances of the reamer directly affect the dimensional accuracy of the machined holes, the manufacturing cost and the service life of the reamer. Reaming, the cutter runout and reaming parameters and the cutting fluid and other factors will make the diameter larger than the diameter of reamer, known as the "expansion"; while the reaming blade radius due to extrusion hole wall, will make the hole recovery rather narrow, called contraction reaming "". The factors of "expansion" and "contraction" exist simultaneously, and the final result should be determined by experiment. Experience shows that: the general expansion with high speed steel reamer reaming, reaming with hard alloy reamer generally shrink, thin hole reaming, often shrink.

 

The nominal diameter of reamer equals to the nominal diameter of the hole. The deviation between the top and bottom of the reamer should be taken into account the expansion tensor and the shrinkage, and the necessary wear tolerances should be set out.

 

If the reaming occurs, the maximum and minimum dimensions of the reamer are designed and manufactured respectively:

 

domax=dωmax+Pamin(6-3)

 

domin=domax-G(6-4)

 

National standard: reamer manufacturing tolerance G = 0.35 (). According to the empirical data, high speed steel reamer (Pmax = 0.15) desirable; shrinkage of cemented carbide reamer reaming after often due to different workpiece materials and different, so often Pamin = 0, Pamin = 0.1 (or). The reliable method of determining Pmax and Pamin is determined by experiments.

Tooth number and tooth slot of reamer

The number of reamer affects the accuracy of reaming, surface roughness, chip space and cutter strength. Its value is generally determined by reamer diameter and workpiece material. When the reamer diameter is large, more teeth are desirable; when the toughness material is used, the number of teeth should be less; and when the brittle material is processed, the teeth number is more desirable. In order to measure reamer diameter, the number of teeth should be even. In the commonly used diameter do=8~40mm range, the number of teeth generally = 4~8.

 

The reamer teeth along the circumference can be equal tooth distance distribution, also can unequal tooth pitch distribution. In order to facilitate the manufacture, the reamer is generally distributed according to the equal tooth pitch.

The geometric angle of reamer

Main deflection angle

 

Processing of steel ductile materials generally =15 degrees; processing of brittle materials such as cast iron usually from =3 DEG ~5 DEG; coarse hinge and the hinge hole, and generally =45 degrees; hand reamers generally take =0.5 ~1.5 degrees.

 

Anterior horn

 

When reaming, the general allowance is very small, the chip is very thin, and the contact length between the chip and the rake face is very short, so the influence of the rake angle is not significant. In order to make it convenient, the average is equal to 0 degrees. It is advisable to reduce the chip deformation when machining ductile materials = 5 degrees ~10 degrees.

 

Posterior horn

 

The reamer is a finishing tool. In order to keep the radial dimension unchanged after regrinding, the angle of the reamer is generally equal to 6 degrees ~8 degrees.

 

Edge inclination angle

 

The rake angle of the general reamer is 0 degrees. But the edge angle can make the cutting process smooth and improve the reaming quality. The reaming toughness larger material, the cutting part of reamer wear = 15 DEG ~20 DEG tiltangle, which can make the reaming of chip forward discharge, not to scratch the surface. When machining blind holes, a larger pit can be opened at the front end of the reamer with a rake angle to accommodate the chip.

 

The cause of the problem

The aperture increases and the error is large

The reamer diameter size design value is too large or hinge edge burr; the cutting speed is too high; the amount of feed improper or excessive machining allowance; reamer reamer main angle is too large; bending; reamer blade attached built-up; grinding blade hinge pendulum difference;cutting fluidImproper installation; when the reamer taper surface oil is not clean or cone is knocking; taper flat tail deviation in the spindle after taper cone interference; axis bending or spindle bearing too loose or damaged; floating reamer is not flexible; and different workpiece axis; two hand hand reaming force uniform, make the reamer shaking.

Aperture reduction

Reamer OD value is small size design; the cutting speed is too low; the feed is too large; the reamer main angle is too small; improper cutting fluid; grinding reamer wear not wear off, to reduce diameter of elastic recovery; steel hinge, margin is too large or the reamer is not sharp, easy to produce elastic recovery. The aperture; the inner hole Buyuan, aperture unqualified.

The hinge hole Buyuan

The reamer is too long, lack of rigidity, vibration reaming reamer; the main angle is too small; with a narrow blade reamer reaming allowance; offset; the surface of the inner hole gap, cross hole; hole surface blisters, porosity; spindle bearing loose, without the guide sleeve or reamer and the guide sleeve with the gap is too large due to the thin; workpiece clamping is tight, the deformation of the workpiece after discharge.

The inner surface of the hole has an obvious arris surface

Reaming allowance is too large; the reamer cutting part after angle is too large; reamer blade width; surface pores, trachoma; spindle swing too large.

The surface roughness of the inner hole is high

The cutting speed is too high; improper cutting fluid; reamer main angle is too large, the reamer blade is not on the same circumference; reaming allowance is too large; reaming allowance is not uniform or too small, not to the local surface hinge; reamer cutting part pendulum difference, blade is not sharp, rough surface; hinge the blade with wide reaming; when the chip is not smooth; reamer abrasion; reamer blade with bumps, burr or edge chipping; haveBuilt-up edgeBecause of the material relationship, it is not suitable for the front angle of zero or the front rake.

The service life of reamer is low

The reamer material is not suitable; the reamer burns in the grinding; the cutting fluid is not suitable; the cutting fluid can not flow smoothly in the cutting place; after the reamer is grinded, the cutting fluid is not suitableSurface roughnessThe value is too high.

The hole position accuracy of the reaming is too bad

The guide sleeve is too far away from the workpiece; the guide sleeve is short in length and the precision is poor; the main shaft is the main shaft; the main shaft is short and the accuracy is poorBearingLoosening.

Cutting edge of reamer tooth

The reaming allowance is too large; the material of the workpiece is too largehardnessThe cutting edge is too high; the pendulum difference is too large, the cutting load is not uniform; the reamer main angle is too small, so that the cutting width increases; when the hinge hole or holes, cutting too much, and not timely removal; grinding cutter has been grinding crack.

Broken shank of reamer

Reaming allowance is too large; the hinge hole, coarse and fine reaming Allowance Distribution and selection of cutting parameters is not suitable; reamer cutter tooth chip space small, chip jam.

The center line of the rear hole is not straight

Before drilling reaming, especially the pore size is small, the reamer is less rigid, cannot correct the original curvature; reamer main angle is too large; the guide is bad, easy to deviate from the direction of the reamer reaming; the cutting part of the inverted cone is too large; in the hole of intermittent reamer gap displacement; hand hinge the hole, force in one direction is too large, forcing the reamer to end deflection, destruction of reamingVerticality

 

Solving measures

The aperture increases and the error is large

According to the specific situation, the reamer outer diameter should be reduced appropriatelycutting speedAdjust the feed amount or reduce the machining allowance properly; reduce the main deviation angle properly; straighten or discard the bent and useless reamerWhetstoneCarefully trimmed to conformity; control of swing in the allowed range; selection of cutting fluid cooling performance better; installation must be before the reamer reamer with taper shank and machine tool spindle taper internal oil wipe, cone bump with hone repair light; grinding flat tail, adjust or replace the reamer; spindle bearing; re floating card head, and adjust the concentricity; pay attention to the correct operation.

Aperture reduction

Replace the reamer diameter size; increasing cutting speed; due to lower feed; increasing the main angle; selection of cutting oily liquid lubrication performance is good; regular exchange of reamer, correct grinding cutting reamer; design of reamer size, should consider these factors, or according to the actual situation of value; test cutting, take the appropriate allowance the sharp, reamer.

The hinge hole Buyuan

The lack of rigid reamer reamer unequal tooth pitch points, reamer installation should use rigid connection, increase the main angle; selection of qualified reamer, control pre processing holePosition tolerance; with unequal tooth pitch reamer, with longer and more accurate guide; selection of qualified blank; using pitch reamer reaming precision machine tool spindle hole, to adjust the gap, the gap with the guide sleeve should be higher; the clamping method properly, reduce the clamping force.

The inner surface of the hole has an obvious arris surface

Reduce reaming allowance; reduce cutting back angle; trim width; select qualified blank; adjust spindle of machine tool.

The surface roughness of the inner hole is high

Cutting speed; cutting fluid according to the material selection process; reduce the main angle, correct grinding blade hinge; reduce reaming allowance; improve the position accuracy and the bottom before the reaming quality or increase reaming allowance; selection of qualified reamers; grinding edge width; according to the specific circumstances of the reamer reduce tooth number, increase capacity groove space or the reamer with cutting edge inclination, the chip successfully replaced regularly; reamer grinding, grinding abrasion in the grinding zone; reamer use and transport process, protection measures should be taken to avoid damage to have bruises; reamer, with super fine aggregate will hurt the reamer. Use oilstone dressing or replace the reamer; to pass the reamer front angle is 5 degrees and 10 degrees.

The service life of reamer is low

According to the reamer material selection of materials, can be usedHard alloyOr reamercoatingStrict control of the grinding reamers;CuttingAnd avoid burn; often according to the correct selection of cutting fluid processing materials; often remove the cutting crumbs slot, cutting liquid enough pressure, after fine grinding and grinding requirements.

The hole position accuracy of the reaming is too bad

The regular replacement of the guide sleeve; lengthened guide sleeve, the guide sleeve and improve reamer gap matching accuracy; timely maintenance of machine tools, spindle bearing clearance adjustment.

Cutting edge of reamer tooth

The pore size modification processing; reduce the hardness of the material or with negative rake or hard alloy reamer reamer; control of swing in an acceptable range; increase the main angle; pay attention to the timely removal of the chip or the reamer with edge inclination; pay attention to the grinding quality.

Broken shank of reamer

The pore size modification processing; modify the allowance distribution, a reasonable choice of cutting reamer; reduce the number of teeth, Jia Darong crumb space or a tooth to tooth clearance.

After reaming hole center line is not straight

Increase reaming or boring processCorrectingThe decrease of the main hole; adjust the appropriate angle; reamers; guide part or replace the lengthened reamer cutting part; pay attention to the correct operation.

 

What is the difference between the tool and the reamer

Reamer: coarse and fine two reamer reamer. The blade number roughing reamer, chip space is large, while the spiral groove is arranged on the cutting edge, to prevent rough ream of chip too much jam. A large number of fine blade reamer, and leaves a small edge, in order to ensure the quality of the pheasant hole. The commonly used reamer specifications are l:50, 1:20, 1:5: installed on the lathe tool used for cutting metal tools. The welding tool, cutter rod is made in the ordinary steel, cutter processing hard alloy blade corresponding incision, copper solder and borax and brazing. Indexable blade structure is the center hole, the fixed blade of the cutter rod gap with bolts, the blade three or four cutting edges can be turned to use, unlike the welding structure has only one cutting edge can be used. The tool is divided into CNC lathe tool, lathe tool, diamond turning, alloy tool, carbide cutting tool[1]

 

Floating reamer.

The standard name should be called the floating boring tool are called floating reamer. The tool size limit. This kind of boring cannot do very little to buy is bought back after his head, to do a floating boring bar shank knife machine according to your device settings, can be straight or handle with Morse taper shank arbor to quenching by cutting a groove installation boring head. Tank size tolerances than boring head 0~0.02mm. The size of the boring boring head need to adjust themselves according to machining hole size