金属拉伸试验标距�?/span>（又称打点机 / 标点机），它是金属材料拉伸试验中给试样标�?span style="font-variant-numeric: normal; font-variant-east-asian: normal; font-variant-alternates: normal; font-size-adjust: none; font-kerning: auto; font-optical-sizing: auto; font-feature-settings: normal; font-variation-settings: normal; font-variant-position: normal; font-variant-emoji: normal; font-stretch: normal; font-weight: 700; line-height: 24px; flex: 0 1 auto; flex-direction: row; justify-content: normal; align-items: normal; padding: 0px; margin: 0px; background-image: none; background-position: 0% 0%; background-size: auto; background-repeat: repeat; background-attachment: scroll; background-origin: padding-box; background-clip: border-box;">原始标距炸�/span>的专用仪器，核心是精准打出等距标记，方便后续测量断后伸长率，符合GB/T 228.1、ISO 6892-1、ASTM E8等国� / 国标要求、�/p>

分类与原琅�/h3>

1. 1.手动标距�?/span>

• 结构简单，通过手摇凸轮 / 丝杠，弹簧驱动冲头打点；常见间距 5mm�?0mm，标� 300/400mm；精度一� ±0.1mm；适合小批量、实验室简易场景；价格低、无需电源、�/p>

2.电动标距�?/span>（主流）

• 微电� / 伺服 + 滚珠丝杠 + 传感器同步，电磁铁驱动冲头自动连续打点；精度可达 ±0.05mm；效率高、适合批量；如 DB-30、DB-400 系列、�/p>

3.激光标距仪（高端无损伤（�/p>

• 激光刻线代替机械冲击，无压痕、不损伤试样；标距线细且清晰，可调线宽深度；适合薄材、高精度研究；免耗材、维护成本低、�/p>

一、核心技术参�?/h3>

• 1.标准点距９�span style="font-variant-numeric: normal; font-variant-east-asian: normal; font-variant-alternates: normal; font-size-adjust: none; font-kerning: auto; font-optical-sizing: auto; font-feature-settings: normal; font-variation-settings: normal; font-variant-position: normal; font-variant-emoji: normal; font-stretch: normal; font-weight: 700; line-height: 24px; flex: 0 1 auto; flex-direction: row; justify-content: normal; align-items: normal; padding: 0px; margin: 0px; background-image: none; background-position: 0% 0%; background-size: auto; background-repeat: repeat; background-attachment: scroll; background-origin: padding-box; background-clip: border-box;">5mm�?0mm；常�?*标距 300mm�?00mm：�/p>

• 2.适用试样：圆棒、板材、型材、管材；

• 3.打点精度：电动优于手动，激�?*：�/p>

• 4.打点力度：可调，避免损伤试样或标记不清、�/p>

二、典型操作流稊�/h3>

1. 1.装夹试样� V 型槽 / 平台，对中找平；

2. 2.设置点距�?/10mm）、总标距长度；

3. 3.手动摇柄或电动一键启动，自动完成整排打点：�/p>

4. 4.松开夹具，取出试样；拉伸断裂后，用卡尺测量断后标距长度，计算伸长率、�/p>

三、选型与维护要炸�/h3>

1. 1.选型：小批量、预算有限逈�span style="font-variant-numeric: normal; font-variant-east-asian: normal; font-variant-alternates: normal; font-size-adjust: none; font-kerning: auto; font-optical-sizing: auto; font-feature-settings: normal; font-variation-settings: normal; font-variant-position: normal; font-variant-emoji: normal; font-stretch: normal; font-weight: 700; line-height: 24px; flex: 0 1 auto; flex-direction: row; justify-content: normal; align-items: normal; padding: 0px; margin: 0px; background-image: none; background-position: 0% 0%; background-size: auto; background-repeat: repeat; background-attachment: scroll; background-origin: padding-box; background-clip: border-box;">手动；工厂质检批量试样逈�span style="font-variant-numeric: normal; font-variant-east-asian: normal; font-variant-alternates: normal; font-size-adjust: none; font-kerning: auto; font-optical-sizing: auto; font-feature-settings: normal; font-variation-settings: normal; font-variant-position: normal; font-variant-emoji: normal; font-stretch: normal; font-weight: 700; line-height: 24px; flex: 0 1 auto; flex-direction: row; justify-content: normal; align-items: normal; padding: 0px; margin: 0px; background-image: none; background-position: 0% 0%; background-size: auto; background-repeat: repeat; background-attachment: scroll; background-origin: padding-box; background-clip: border-box;">电动；薄带、高精度、不允许损伤试样逈�span style="font-variant-numeric: normal; font-variant-east-asian: normal; font-variant-alternates: normal; font-size-adjust: none; font-kerning: auto; font-optical-sizing: auto; font-feature-settings: normal; font-variation-settings: normal; font-variant-position: normal; font-variant-emoji: normal; font-stretch: normal; font-weight: 700; line-height: 24px; flex: 0 1 auto; flex-direction: row; justify-content: normal; align-items: normal; padding: 0px; margin: 0px; background-image: none; background-position: 0% 0%; background-size: auto; background-repeat: repeat; background-attachment: scroll; background-origin: padding-box; background-clip: border-box;">激先�/span>：�/p>

2. 2.维护：冲� / 刻针定期检查、更换；保持工作台清洁无铁屑；电动款注意电机润滑；激光款避免粉尘进入光路、�/p>

四。常见标准与误区

• 1.必须符合 GB/T 228.1；标距点不能打在试样夹持端，仅在平行段标注；

• 2.误区：打点过深会造成应力集中，影响拉伸试验结果（尤其对薄板、脆性材料）、�/p>