GB/T 38987-2020 English PDF

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GB/T 38987-2020: Cemented carbide rods with helical coolant holes
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 38987-2020	339	Add to Cart	4 days	Cemented carbide rods with helical coolant holes	Valid

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Basic data

Standard ID: GB/T 38987-2020 (GB/T38987-2020)
Description (Translated English): Cemented carbide rods with helical coolant holes
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: H72
Classification of International Standard: 77.160
Word Count Estimation: 18,191
Date of Issue: 2020-07-21
Date of Implementation: 2021-06-01
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration

GB/T 38987-2020: Cemented carbide rods with helical coolant holes

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Cemented carbide rods with helical coolant holes ICS 77.160 H72 National Standards of People's Republic of China Cemented carbide spiral hole bar 2020-07-21 released 2021-06-01 implementation State Administration for Market Regulation Issued by the National Standardization Management Committee

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard was proposed by China Nonferrous Metals Industry Association. This standard is under the jurisdiction of the National Nonferrous Metals Standardization Technical Committee (SAC/TC243). Drafting organizations of this standard. Zhuzhou Cemented Carbide Group Co., Ltd., Xiamen Jinlu Special Alloy Co., Ltd., Zigong Cemented Carbide Co., Ltd. Ren company, Shenzhen Zhucheng Technology Co., Ltd., Nanchang Cemented Carbide Co., Ltd. The main drafters of this standard. Mao Shanwen, Meng Xiaowei, Liang Hong, Liu Tiemei, Yang Ligeng, Liao Jun, Jiang Tao, Ling Zhi, Zou Jianping, Chen Chengyi, Zhang Yue, Huang Shuai, Wu Aihua. Cemented carbide spiral hole bar

1 Scope

This standard specifies the classification and schematic diagram, technical requirements, test methods, inspection rules, markings, packaging, and transportation of cemented carbide spiral hole bars. Import, storage, quality certificate and purchase order (or contract) content. This standard is applicable to the processing of carbide spiral hole rods for cutting tools with internal cooling holes (hereinafter referred to as "spiral hole rods").

2 Normative references

The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this article Pieces. For undated references, the latest version (including all amendments) applies to this document. GB/T 1800.2 Product Geometric Technical Specification (GPS) Linear Dimensional Tolerance ISO Code System Part 2.Standard Tolerance Zone Code and limit deviation table of hole and shaft GB/T 5242 Inspection rules and test methods for cemented carbide products GB/T 5243 Marking, packaging, transportation and storage of cemented carbide products 3 Classification, schematic diagram and model representation rules 3.1 Classification Spiral hole bars are divided into double spiral hole bars and triple spiral hole bars according to the number of holes. According to the supply status, it is divided into spiral hole blank bar and screw Spin holes for fine grinding of bars. 3.2 Schematic The schematic diagram of the double spiral hole blank bar is shown in Figure 1a), and the schematic diagram of the triple spiral hole blank bar is shown in Figure 1b). a) Schematic diagram of blank bar with double spiral holes b) Schematic diagram of blank bar with three spiral holes Description. P ---Pitch, the linear distance of one rotation of the screw thread of the spiral hole bar; L --- the length of the spiral hole bar; d --- the hole diameter of the spiral hole bar; D --- the outer diameter of the spiral hole bar; e --- eccentricity, which is the distance between the center of the circle where the center of the two or three holes is located and the center of the bar; TK ---hole spacing, the diameter of the circle where the center of the two or three holes is located. Figure 1 Schematic diagram of spiral hole bar ......

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