Introduction General part

Accuracy calculation of machine device.

The adjustment error is equal to the large value of the possible displacement of the workpiece.
The deflection of the cutting tool inside the bushing is due to the sum of the gap between them and the gap between the bushing and the hole.
The reason for the deviation of the cutting tool from the nominal position is:
• kicking the cutting part during rotation;
• symmetrical sharpening;
• non-uniform packaging material;
• Irregularities on the input surface of the cutting tool;
• incompatibility of the cutting tool axis with the guide bushing arrows.
The error of is calculated according to the scheme using the following formula:

Here:
(Su - bT) - the maximum distance between the cutting tool and the conductor bushing hole, mm
- working hole depth, mm
H - the length of the guide part of the conductor bushing, mm
h - the distance from the blank surface to the side surface of the bushing, mm
The following components must be taken into account when calculating the device error.
_n1 - coordinate position error of the conductor bushing shaft (bushing shaft shaft) with respect to the mounting element;
_n2 - the error of non-perpendicularity of the bushing axis to the plane, which determines the state of the blank.
The value of _n2 is calculated in the following formula body:
_n2 =

Here:
ά - the non-perpendicularity (non-parallelism) of the base length (L)

size

_n3 - the error due to the displacement of the conductor bushing axis relative to the bushing (bushing slot) (taken into account when using interchangeable and fast-switching bushings).
_n3=
Here:
S_max - the maximum distance between the conductor bushing and the socket connection.
_n4 - error equal to the eccentricity of interchangeable or fast interchangeable bushings;
It is recommended to accept _n4 size in the range of _n4 0,005 mm.
When permanent bushings are used, n3 and n4 are zero.
The machine-related errors _c and the installation error of the device _up are set to zero so that they do not affect the condition of the hole being machined.
It is recommended to perform the conductor calculation using the following formula.
₃
In our project, we determine the dimensions of the conductor bushings d₁ and d₂, d₃, the nature of the joint, the permissibility of the breakdown of the mounting and guide elements, as well as the permissibility of the location of the working surfaces of the conductor. We draw a detail processing sketch and a device sketch.
Ø 8N11 holes are drilled for machining sketch and operation. To the above, we determine the corpuscular dimensions.
We adjust the diameter of the mounting surfaces to the case of free installation of the workpiece.
d₁= Ø25g6
Determine the diameter of the conductor bushing in the table case:
d₂= Ø8F7
d₃ - we determine the size of the joint in the case of free installation of the conductor plate on the finger.
d₃= Ø15
When drilling a hole, the positional clearance and the displacement of the surface axis A should be 0.15 mm automatically. This condition limits the movement of the shafts of the machined holes in any direction from their nominal position. Therefore, the area of possible position of each axis is determined by a circle t = 0.15 mm. In this case, the machining accuracy is d = 0.15mm
We use this formula to perform the calculation.
₃
Ks = 1.0
With a starting base of 3 = 0, the technological bases overlapped.
u3 = 0 - the setting error of the blank is equal to the maximum possible displacement of the base surface axis relative to the finger d1. Allow the finger d1 to break
Assigning Tizn1 = 0.02, we get the following
_uz=
The device error n, which is equal to the positional permissibility of the surface G relative to the surface D, is determined as follows:

_Here:
-positional position of the arrows of the holes of the conductor bushings in relation to the mounting hole of the conductor plate (E-surface). We calculate the error value using this formula.

3.