RU2345870C1 - Deep boring attachment - Google Patents

Abstract

FIELD: mechanics.

SUBSTANCE: proposed attachment comprises peripheral and other cutting plates arranged at different distance from the drill axis, two guide plates fitted on the head edges. Note that one of the guide plates is arranged right opposite the peripheral cutting plate, while the second one makes a central angle with the first one directed towards rotation and the cutting plates on one side of the head axis are at an angle to the cutting plates on the other side. The central angle between the guide plates is selected to make 100-110°.The total length of cutting edges arranged on the peripheral plate side and the total length of cutting edges of the blades arranged on the opposite side are interrelated and related to the angle. The position of the cutting plates on one side of the head relative to the other side are selected proceeding from cited relationships, while angle α is taken to make 10 to 25°.

EFFECT: reduced wear of cutting and guide plates, higher accuracy of drilling.

3 dwg

Description

The invention relates to the field of mechanical engineering and can be used for processing deep holes in a solid material.

The closest analogue is a drill for deep drilling [1] with a peripheral and other cutting inserts and two guide plates, in which the peripheral cutting plate is placed opposite one of the guides. The description of the invention does not specify the values of the central angles between the guide plates, as well as the cutting ones, but they are important, because affect the magnitude of the force pressing the guide plates of the head to the machined hole, as well as the uniform distribution of this force on the support plates.

The present invention solves the problem of reducing and even distribution of force from the cutting inserts to the guide plates, as a result - reducing wear of the cutting and guide plates, as well as improving the accuracy of the location of the axis of the machined hole.

This is achieved by the fact that the central angle between the guide plates ψ is chosen equal to 100 ... 110 °, and the ratio of the total length of the cutting edges Σl ₁ located on the side of the peripheral plate, the total length of the cutting edges Σl _{2 of the} plates located on the opposite side, and the installation angle α the cutting inserts of one side of the head relative to the other are selected according to certain ratios, the angle α being 10 ... 25 °.

Figure 1 shows a General view of the head, figure 2 - view A, figure 3 - view B.

On the body of the head 1 (Fig. 1), a cartridge 2 with a cutting peripheral plate 3 and a cutting plate 4 is installed, a cartridge 5 (Fig. 2) with a cutting plate 6, a guide plate 7 and a guide plate 8, which is opposite to the cutting peripheral plate 4, is adjustable using the pads 9 (figure 3) and the screw 10, reinstalled in one of the holes 11 or 12. The cutting plates 3, 4 and 6, located at different distances from the axis of the head, are placed on both sides relative to the axis of the head to compensate for the cutting force. The guide plate 8 is located opposite the peripheral cutting insert 3 for the purpose of controlling and regulating the diameter of the machined hole, and the second guide plate 7 makes up from the first in the direction of rotation a central angle ψ equal to 100 ... 110 °. The total length of the cutting edges Σl ₁ (l ₁ + l ₂ ) of the plates located on the side of the peripheral plate is in a certain ratio with the total length of the cutting edges Σl ₂ (l ₃ ) of the plates located on the opposite side of the axis and the angle of the relative installation of the cutting plates α on one side of the head (plates 4 and 9) relative to the other (plate 10):

and the angle α is 10 ... 25 °.

Before working to establish and adjust the diameter of the machined hole, the guide plate 8, which is opposite to the cutting peripheral plate 3, is reset to the upper position by moving the screw 10 into the hole 12 (figure 3), which allows you to control the size of the head D, and, accordingly, the machined hole direct measurement, as well as adjust it by installing the pads 9 and adjusting the cartridge 2. After controlling the size of the head, the guide plate 8 is set to its original position by moving screw 10 into hole 11.

, должен быть меньше суммарной тангенциальной силы резания на все пластины в 3…4 раза для снижения давления на направляющие пластины и поддержания жидкостного трения, то есть

Угол между направляющими пластинами у составляет 100…110°. Это приводит к тому, что реакции R₁ и R₂, действующие на направляющие пластины, равномерно прижимают головку к обработанному отверстию, таким образом:During operation of the head, the tangential cutting forces acting on the inserts depend on the length of the cutting edges. The total cutting force ΣF ₁ (F ₁ + F ₂ ) acting on the inserts located on the side of the peripheral plate and the total cutting force acting on the inserts on the opposite side ΣF ₂ (F ₃ ) form a vector parallelogram, the resulting force of which is R should be directed between the guide plates in order to evenly distribute forces on them. In addition, the vector of the resulting cutting force R, where

should be less than the total tangential cutting force on all inserts by 3 ... 4 times to reduce pressure on the guide plates and maintain fluid friction, that is

The angle between the guide plates y is 100 ... 110 °. This leads to the fact that the reactions R ₁ and R ₂ acting on the guide plates uniformly press the head against the machined hole, thus:

To simplify the calculations and design of the tool, the total cutting forces can be replaced by the total lengths of the main cutting edges of the respective inserts. This assumption is possible with the same feed:

 INFORMATION SOURCES

1. Patent RU No. 2136450, B23B 51/00. Drill Support Insert / Sandvik, 1999

Claims (1)

The head for deep drilling, containing peripheral and other cutting inserts located at different distances from the axis of the drill, two guide inserts mounted on the periphery of the head, while one of the guide inserts is located strictly opposite to the peripheral cutting insert, and the second makes the central angle ψ from the first in the direction of rotation, and the cutting inserts on one side of the axis of the head are located at an angle to the cutting inserts on the other hand, characterized in that the central angle between the guide rails ψl is chosen equal to 100-110 °, and the ratio of the total length of the cutting edges Σl ₁ located on the peripheral side of the plate, the total length of the cutting edges Σl _{2 of the} plates located on the opposite side and the installation angle α of the cutting inserts of one side of the head relative to the other is selected the following dependencies:

moreover, the angle α is selected equal to 10-25 °.

Images