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Several methods of machining inclined holes on horizontal machining centers

machining centers are often used in the development and trial production of new products. Due to the rapid change of products, shortening the switching time between processes and improving production efficiency have been our most concerned problems for a long time. Therefore, using the rotary center of horizontal machining center, a set of program for rapid calculation of mechanical coordinates of the origin of workpiece coordinate system is developed, and good results are achieved in the process of machining irregular inclined holes and inclined planes

1 calculation principle and format of workpiece coordinate system origin and mechanical coordinates

1) programming principle of calculating workpiece coordinate system origin and mechanical coordinates establish a coordinate system with the mechanical origin as the origin, calculate the relationship between workpiece coordinate system origin and mechanical origin with trigonometric function, and then use the local variables of NC system to express the conversion relationship between them, and compile an o**** subroutine

2) mechanical coordinate calculation format of workpiece coordinate system origin (FANUC System)

g65p*****x 24y 25z 26q 17b 101r 18s 19t 20u 21i \4

where the face values after X, y and Z are the mechanical coordinate values of the corrected locating pin or locating surface, and B is the working coordinate value during leveling tooling.The angle of the table, R, s, t corresponds to the offset value between the origin of the new workpiece coordinate system and the origin of the original workpiece coordinate system, Q corresponds to the rotation angle between the new workpiece coordinate system and the original workpiece coordinate system (generally the angle marked on the drawing), u is the angle correction value, and I is the coordinate system

2 three methods of machining inclined holes

1) translation before rotation. The so-called translation before rotation refers to that in the machining process, first translate the coordinate system of workpiece positioning to the orifice of the specified machining hole, and then rotate the translated workpiece coordinate system to a specified angle to establish a new workpiece coordinate system for part machining

figure 1

if we want to process the hole shown in the K direction in Figure 1, when establishing a new workpiece coordinate system, we can adopt the method of translation first and then rotation, which mainly includes the following steps:

① select the zero point of the drawing as the origin of the original workpiece coordinate system, and establish the X-Y selected trouser shaped sample as shown in Figure 1: apply the trouser shaped sample to the workpiece coordinate system that is insensitive to the notch length

② translate the X-Y workpiece coordinate system in the negative direction by 110.8mm in the X direction and 302.2mm in the negative direction in the Z direction

③ rotate the translated workpiece clockwise by 150 ° to establish a new workpiece coordinate system of X '-z'

④ for the newly established X '-z' workpiece coordinate system, the mechanical coordinate calculation format of its origin is

g65p*****x# 8Y#25Z#. 2Q150.B#101RO. S0.T0. U0.I#4。

2) rotate first and then translate. The so-called "rotate first and then translate" refers to that in the processing process, first rotate the workpiece coordinate system to a specified angle, and then level the rotated workpiece coordinate. In 2014, the chemical industry and non-ferrous metal industry completed the fixed asset investment of 1.56 trillion yuan and 691billion yuan respectively, and moved it to the orifice of the specified hole to establish a new workpiece coordinate system to process parts

Figure 2

if we want to process the inclined hole f6.5 in Figure 2, in the process of establishing a new workpiece coordinate system, we can adopt the method of rotation first and then translation, which mainly includes the following steps:

① select the center of F92 as the origin of the workpiece coordinate system, and establish the x-z workpiece coordinate system as shown in the figure

② rotate the x-z workpiece clockwise by 38 °

③ translate the rotated workpiece coordinates in the negative direction of Z by 46mm according to the national manufacturing Power Construction Strategy Advisory Committee, and establish a new workpiece coordinate system of X '-z'

④ when programming the newly established X '-z' workpiece coordinate system, the calculation format of the mechanical coordinate of its origin is

g65p*****x #24y #25z #26q38 B#101R0. S0.T-46. U0.i#4

similarly, when machining the inclined hole f7.5 in Figure 2, there are the following main steps when establishing the coordinate system:

① take the center of F92 circle as the origin of the workpiece coordinate system, and establish the workpiece coordinate system as shown in Figure x-z

② rotate the x-z workpiece counterclockwise by 24 ° 28 'or 24.467 °

③ translate the rotating workpiece coordinate system Z to the negative direction by 46mm to establish a new workpiece coordinate system of X '-z'

④ when programming the newly established X '-z' workpiece coordinate system, the calculation format of the mechanical coordinate of its origin is

g65p*****x #24y #25z #26q-24.467b #101r0 S0.T-46. U0.I0. I 4

3) the combination of translation before rotation and rotation before translation. For example, when machining the s-inclined hole in Figure 1, if only one of the above two methods is used, some calculations are required to complete the transformation of the coordinate system, but if the two methods are used together, there is no need to calculate. The specific steps are as follows:

① first translate the origin of the x-z workpiece coordinate system to the center of the great circle with a diameter of f489, that is, translate 125mm in the negative direction in the X direction, Translate 18mm in the negative direction in the Z direction

② rotate the translated workpiece clockwise by 150 °

③ translate the translated and rotated workpiece coordinate system Z to the positive direction by 244.5mm, and establish a new workpiece coordinate system X "-z"

④ the newly established X "-z" workpiece coordinate system. When compiling, its origin calculation format is

g65p*****x# Y#25Z#. Q150.B#101R0. S0.T244.5UO. I 4

3 conclusion the equipment is suitable for manufacturing waterproof coiled materials, metal wires, textiles, rubber, ceramics, packaging industry, film, paper, plastic products and other manufacturing industries, as well as product quality supervision departments at all levels. From the above examples, it can be seen that on the horizontal machining center, it is very convenient to use the calculation program of the mechanical coordinates of the origin of the workpiece coordinate system to process inclined holes. Once the positioning mode of the part is determined, we only need to correct the mechanical coordinates of the positioning pin or the positioning surface x, y, Z and the rotation angle B of the workbench during the leveling tooling, and then we can process the irregular oblique hole; It is not necessary to calibrate or manually calculate the mechanical coordinates of the origin of the workpiece coordinate system every time a workpiece coordinate system is established. The specific method to be adopted depends on the marked size of the drawing. The principle is to minimize the calculation, subject to the size of the drawing, and avoid unnecessary errors. The practice in recent years has proved that using the calculation program of the mechanical coordinates of the origin of the workpiece coordinate system, the processed parts meet the requirements of the drawing, reducing the workload of technicians and producers, improving production efficiency, and accelerating the trial production process. (end)

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