GB/T 26548.12-2021Hand-held portable power tools - Test methods for evaluation of vibration emission - Part 12: Die grinders (English PDF)

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Part 1.Structure and Drafting Rules of Standardization Documents"

Drafting.

This document is part 12 of GB/T 26548.GB/T 26548 has released the following parts.

---Part 1.Angle and end face grinders;

---Part 2.Gas trigger, nut wrench and screwdriver;

---Part 3.Polishing machines, rotary, sliding and compound polishing machines;

---Part 4.Straight shank grinder;

---Part 5.Drills and impact drills;

---Part 6.Compaction machine;

---Part 7.Punching machines and scissors;

---Part 8.Reciprocating saws, polishing machines and files, and pendulum or rotary saws;

---Part 9.Derusting hammer and needle beam derusting device;

---Part 10.Impact rock drills, hammers and crushers;

---Part 11.Stone Hammer;

---Part 12.Mold grinder.

This document uses the translation method equivalent to ISO 28927-12.2012 "Hand-held portable power tool vibration test method Part 12

Sub. Mould Grinding Machine.

The Chinese documents that have consistent correspondence with the normatively cited international documents in this document are as follows.

---GB/T 5621-2008 Performance test method for rock drilling machinery and pneumatic tools (ISO 2787.1984, MOD)

---GB/T 6247.1-2013 Rock Drilling Machinery and Portable Power Tools Terminology Part 1.Rock Drilling Machinery, Pneumatic Tools and

Pneumatic machinery (ISO 5391.2003, MOD)

---GB/T 6247.2-2013 Terminology for rock drilling machinery and portable power tools Part 2.Hydraulic tools (ISO 17066.

2007, IDT)

---GB/T 14790.1-2009 Mechanical vibration Measurement and evaluation of human exposure to hand-transmitted vibration Part 1.General requirements

(ISO 5349-1.2001,IDT)

---GB/T 14790.2-2014 Mechanical vibration Measurement and evaluation of human exposure to hand-borne vibration Part 2.Workplace

Practical Guide to Measurement (ISO 5349-2.2001, IDT)

---GB/T 25631-2010 Mechanical vibration Hand-held and hand-guided mechanical vibration evaluation rules (ISO 20643.2005,

IDT)

---GB/T 30473-2013 Coated abrasive cylindrical sand sleeve (ISO 2421.2003, IDT)

---GB/T 30474.1-2013 Cylindrical sand sleeve clamping device Part 1.Belt shaft clamping device for hand-held grinder

(ISO 15637-1.2002,MOD)

---GB/T 34560.1-2017 Structural steel Part 1.General technical delivery conditions for hot-rolled products (ISO 630-1.2011,

MOD)

---GB/T 34560.2-2017 Structural steel Part 2.General purpose structural steel delivery technical conditions (ISO 630-2.2011,

MOD)

---GB/T 34560.3-2018 Structural Steel Part 3.Technical Delivery Conditions of Fine Grain Structural Steel (ISO 630-3.2012,

MOD)

---GB/T 34560.4-2017 Structural steel Part 4.Technical delivery conditions for quenched and tempered high yield strength structural steel plates

(ISO 630-4.2012,MOD)

---GB/T 34560.5-2017 Structural steel Part 5.Technical delivery conditions for atmospheric corrosion resistant structural steel (ISO 630-5.

2014, MOD)

---GB/T 34560.6-2017 Structural Steel Part 6.Technical Delivery Conditions for Seismic Building Structural Steel (ISO 630-6.

2014, MOD)

This document has made the following editorial changes.

--- Convert the "bar" in the international standard to "MPa" (1bar=0.1MPa).

Introduction

In order to measure the vibration radiation value of the handle of the handheld portable power tool in expected use, to evaluate and manage the operation of the operator in the use of the machine

The International Organization for Standardization plans to formulate a 13-part document of ISO 28927 for the risk of vibration damage faced by the industry. Has been released so far

The 12-part document, and the 13-part document is under development. China intends to adopt the same standard for 13 partial documents of ISO 28927.

It is determined as the document corresponding to each part of GB/T 26548.The proposed composition of GB/T 26548 is as follows.

---Part 1.Angle and end face grinders. Covers hands equipped with protective covers for grinding, cutting and rough grinding on various materials

Holding machine.

---Part 2.Gas trigger, nut wrench and screwdriver. Covers hand-held machines for tightening and loosening threaded fasteners.

---Part 3.Polishing machines, rotary, sliding and compound polishing machines. Covers the purpose of surface treatment rather than removal of material

Purpose of the handheld machine.

---Part 4.Straight shank grinder. Covers the use of various flat grinding wheels, double bevel grinding wheels, and core grinding heads on various materials

Hand-held machine for grinding and surface finishing operations.

---Part 5.Drills and impact drills. Covers hand-held machines that drill holes in various materials through rotation and impact.

---Part 6.Compaction machine. Covers hand-held machines for foundry sand compaction or stamping operations.

---Part 7.Punching machine and scissors. Covers hand-held machines for cutting sheet metal and composite materials.

---Part 8.Reciprocating saws, polishing machines and files, and pendulum or rotary saws. Covers the table with a file or polishing tool installed

Hand-held machines for surface trimming, hand-held machines for sawing boards, medical plaster or wood, or

Hand-held machines for saw blades of various materials, as well as hand-held machines for cutting metal and composite materials.

---Part 9.Derusting hammer and needle beam derusting device. Covers the use of reciprocating working tools or needle bundles to remove oil from various materials

Hand-held machines with lacquer, rust spots or oxide skin.

---Part 10.Impact rock drills, hammers and breakers. Covers hand-held rotation for drilling holes in hard materials such as rock and concrete

Impact machine.

---Part 11.Stone Hammer. Covers stone hammer type hand-held machines, which are usually pneumatic straight-handled machines.

---Part 12.Mold grinder. Covered by hard alloy burr knife or grinding head mounted on the chuck in hard steel/plastic, etc.

Material, a hand-held machine for trimming operations.

---Part 13.Fastener drive tools. Covers handheld machines for fastener drive.

This document is a Type C standard specified in ISO 12100.

For machines designed and manufactured in accordance with the requirements of Type C standards, when the requirements of Type C standards are different from those in Type A or Type B standards

At this time, the requirements in the C-type standards are better than those in other types of standards.

GB/T 25631 gives general technical conditions for handheld and hand-guided mechanical vibration radiation measurement, GB/T 26548 (all parts

Points) Based on this standard, the vibration test method of hand-held portable machines is given, and the operating conditions of the machine under the type test conditions are specified.

Parts and other requirements for type test performance. The standard structure and chapter numbering are consistent with GB/T 25631.

This document adopts the basic sensor positioning method first adopted in the European series of standards EN60745.

The description is inconsistent with GB/T 25631.The sensor is preferably placed in the area between the thumb and index finger near the hand, because this position is right.

The operator has minimal interference when holding the machine.

The vibration generated by the mold grinder in use changes greatly, which is mainly due to the change of the imbalance of the insertion tool and the insertion tool and the workpiece.

Caused by changes in the contact surface. The vibration value largely depends on the skill of the operator. This document is carried out using real working process

test.

In order to provide a good reproducibility measurement method, the measurement process is described in detail, and it is necessary to follow the process for measurement. Choose this test

The vibration value generated by the measurement process is as consistent as possible with GB/T 25631.The values obtained according to this document are type test values. Vibration in the workplace

The assessment of exposure adopts the procedures of GB/T 14790 (all parts).

The value obtained is the type test value, which is used to represent the average value of the upper quartile of the typical vibration of the machine in actual use. However,

Actual values sometimes vary greatly, depending on many factors, including the operator, work tasks, and insertion tools or consumables. The machine itself

The maintenance status may also be important. In real working conditions, the impact of operators and operating procedures on low-amplitude vibration is particularly serious. because

Therefore, the vibration radiation value below 2.5m/s2 is not recommended for evaluation under real working conditions. In this case, it is recommended to use 2.5m/s2 vibration

Momentum value is used to directly evaluate the vibration of the machine.

If precise values are required in a specific workplace, it is necessary to perform the calculation in accordance with the provisions of GB/T 14790 (all parts) under this working condition.

Line measurement. The measured vibration value under actual working conditions may be higher or lower than the value obtained with this document.

Under actual working conditions, the use of excessively unbalanced insertion tools, bending of the output shaft or wear of the chuck are prone to high vibration.

Dynamic value.

Vibration test method for handheld portable power tools

Part 12.Mold Grinding Machine

1 Scope

This document specifies the test method for hand-transmitted vibration measurement of the handle of the mold grinder, and determines the operation of the machine under typical test conditions.

Type inspection procedure for the vibration level of the gripping part of the handle. The measured results are used to compare the vibration of the same type and different models of machines.

This document is suitable for driving by compressed air or other means, through the alloy file or grinding head mounted on the chuck, in hard steel/plastic and other different materials.

It is a hand-held machine for trimming operations on materials; it is also suitable for low-speed mold grinders that use a grinding wheel or a cylindrical grinding wheel.

Note 1.This document does not apply to straight shank grinders with type 1 flat grinding wheels, type 4 single bevel grinding wheels or different types of cylindrical dies with shank.

It is specified in GB/T 26548.4.

Note 2.This document does not apply to mold grinders that use wire brushes.

Note 3.To avoid confusion between "power tools" and "insertion tools", "machines" are used instead of "power tools" throughout this document.

2 Normative references

The contents of the following documents constitute the indispensable clauses of this document through normative references in the text. Among them, dated quotations

Only the version corresponding to that date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to

This document.

ISO 630 (all parts) Structural steel (Structuralsteels)

ISO 2421 Gauze Cylindrical Sand Set (Coatedabrasives-Cylindricalsleeves)

ISO 2787 Rotary and impact pneumatic tools performance test (Rotaryandpercussivepneumatictools-Perfor-

mancetests)

ISO 5349 (all parts) Mechanical vibration Measurement and evaluation of human body exposure to hand-borne vibration (Mechanicalvibration-

Measurementandevaluationofhumanexposuretohandtransmittedvibration)

ISO 5391 Pneumatic tools and machines-Vocabulary

ISO 15637-1 Cylindrical Grinding Sleeve Support Fixture Part 1.Shank Support Fixture for Manual Grinding Machine (Holdingfix-

turesofcylindricalabrasivesleeves-Part 1.Holdingfixtureswithshankforhand-heldgrindingma-

chines)

ISO 17066 Hydraulic tools-Vocabulary (Hydraulictools-Vocabulary)

ISO 20643.2005 Mechanical vibration Hand-held and hand-guided mechanical vibration evaluation rules (Mechanicalvibration-

Hand-heldandhand-guidedmachinery-Principlesforevaluationofvibrationemission)

DIN8033-1 hardmetal burrs technical requirements (Hardmetalburrs-Technicalrequirements)

DIN8033-2 Cemented Carbide Burr Knife Cylindrical Burr Knife (Hardmetalburrs-Cylindricalburrs)

EN12096 Marking and verification of mechanical vibration vibration radiation value (Mechanicalvibration-Declaration and Verifica-

tionofvibrationemissionvalues)

3 Terms, definitions and symbols