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我厂生产的ZL40、ZL50装载机,其后车架大梁结构为箱形结构,长2.7m,断面尺寸见图1。每个后车架有两件大梁,大梁一端插入后铰接架两翼内,被包容,因此外轮廓尺寸250mm×94mm为控制尺寸。尺寸94mm由件3、4机加工铣边得到控制,尺寸250mm由夹具控制。一侧为固定定位块1。另一侧为活动定位块2(见图2)。组合件1时,为保证焊接坡口尺寸12mm。以往采用一侧定位方法(见图2)。此方法只能保证一侧坡口尺寸12mm,但件1宽度因为气割是下料件。尺寸公差大,工艺尺寸定为226±1.5,即可能会出现224.5～227.5。若是224.5,另一侧坡口就是13.5,竖板与水平板只有0.5搭接,焊接时难度大,打底焊常烧穿。因此常要调整规范打底,焊接效率低;若是件1下
I plant production ZL40, ZL50 loaders, followed by frame structure for the box-shaped box structure, length 2.7m, section size shown in Figure 1. Each rear frame has two girders, one end of the girder is inserted into the two wings of the rear hinged frame and is contained, so the outer profile size is 250mm × 94mm for the control size. Size 94mm by 3, 4 machining milling edge control, size 250mm by the fixture control. Side of the fixed block 1. The other side of the activities of positioning block 2 (see Figure 2). Assembly 1, in order to ensure the welding groove size 12mm. In the past using one-sided positioning method (see Figure 2). This method can only guarantee one side of the groove size 12mm, but the width of a piece because the gas cutting is the next piece. Large dimensional tolerances, process size set at 226 ± 1.5, that may appear 224.5 ~ 227.5. If 224.5, the other side of the bevel is 13.5, riser and horizontal plate only lap 0.5, the difficulty of welding, welding at the end of welding often wear. So often need to adjust the standard primer, welding efficiency is low; if a piece of 1