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Ordinary slant wedge mechanism, the slider is generally attached to the lower die, so that the design and movement is relatively simple, but in some cases, when the slider is attached to the lower die, the feeding and removal of the parts is not convenient, or affect the realization of other functions of the mold, then the hanging wedge mechanism should be considered, according to the movement of the slider, the slant wedge mechanism can be divided into flat slant wedge mechanism and inclined slant wedge mechanism (mold body and slider contact surface for the slant) .

2 ,The name of inclined wedge

Code - work mounting surface (W) - stroke (ST) - angle of the slanting wedge (θ ) - fixed mode (K for key positioning, N for pin positioning)

3, The advantages and disadvantages of the various types of wedges commonly used

a,Horizontal slanting wedge: it is necessary to fully consider the problem of taking out the parts.

b, hanging wedge: good workability, but the edge of the research and matching difficulties.

c, double-action wedge: occupy more space, and complex structure, for the strength of the mold has an impact (rotary wedge alternative).

4, the oblique wedge mold oblique wedge stroke design should express the content

1) the stroke of the slanting wedge slider: ST

2)Slanting wedge stroke:L

3)Slanting wedge operating stroke:W

4)Stroke of slant wedge press plate:C

5)Slanting wedge angle:θ

6)Start point of upper press core action:P

7) Upper and lower die guide engagement point: G

5, Return mode of sliding wedge

a) Spring

b) Polyurethane rubber

c) cylinder

d) Nitrogen spring

e) Other methods

In general, springs are used as the source of return force, but other return methods such as cylinders are used in the following cases.

a) the stroke of the tilt wedge is relatively long, the spring can not meet the stroke requirements

b) double-action tilt wedges, which need to be repositioned.

General considerations.

1) When installing the spring and cylinder to the slant wedge die slider, according to its installation position, the slant wedge slider movement moment, the set slider needs to consider the following to obtain the overall balance

a) As close as possible to the slide guide surface (height direction)

b) Installed as close as possible to the guide rail at both ends of the wedge slider (horizontal direction)

(2) the mold structure must be designed to take into account the premise that the maintenance spring or cylinder can be replaced without dismantling the large components of the mold.

6, the principle of determining the return force of the slanting wedge slider

Horizontal slant wedge mold

(Total weight of sliding wedge*1.0) or more

Inclined wedge die

(Total weight of sliding wedge * 1.5) or more

For the part of the self-made slanting wedge, because of the wide range of aspects involved, need to consider more comprehensive issues, here is not a detailed description (specific by the cold workers or gold assistant to explain)

7, the design of standard bevel wedge mold

On the premise of having the part process diagram and 3D digital model

can be designed by the following steps.

1) Firstly, make a straight line normal to the hole (see the figure below)

2) Secondly, project the straight line on the XY plane (on the mold base) to determine the angle of the standard bevel wedge, the actual measured angle is: 8°, there is no such specification in the standard bevel wedge, the approximation is to take a very close specification: 10° bevel wedge.

b) Determine the placement angle of the swash wedge on the mold plane

Again project the projection line on the YZ plane to determine the placement angle of the standard bevel wedge, the measured value is: 10 ° (need to pay attention to the capacity of each company's processing machine tool, whether it can be processed at any angle or has a special angle requirements)

C) Determine the installation height and position of the swash wedge through the cross section

1) The position of the punch is determined and the angle and position of the concave die set and the anti-rotation angle are accurately determined;

2) The wedge is placed according to the angle of placement on the die holder and the position of the punch holder.

D) Select the installation method of the punch holder according to the actual situation of the die.

From the angle of balance of force on the sliding wedge, the most ideal fixing method is to control the force point of the punch as much as possible on the center of the sliding wedge, and the installation method of the fixing seat is arranged according to the actual situation in special cases; the approximate position of the sliding wedge on the die holder is determined according to the fixing angle of the punch fixing seat.

E)According to the fixed position and cross-sectional drawing of the bevel wedge slider and punch fixing seat, the mounting height and plane position of the bevel wedge are determined, and the mounting height and plane coordinate size of the bevel wedge are integers (0 and 5 at the end) as far as possible.

F) When designing the standard inclined wedge die, the following matters are to be considered since the stroke of the inclined wedge has been fixed.

Ordinary inclined swash wedge.

Since the working part is fixed on the lower die, it should be considered that the parts can be fed smoothly; its stroke should ensure that it is not less than the width of the edge of the flange + the distance of the flange bevel wedge trimming or punching or flanging + 20~30mm (Note: 30mm if it is automated stamping, it should be 50mm when it is manually operated)

Lift bevel wedge slider stroke.

The distance from the flange to the trimming, punching or flanging of the bevel wedge +20mm;

Lifting of the bevelled wedge requires consideration of whether the working components installed on the slider (punch, side trimmer block, flanging block) affect the assembly and disassembly of the press core; and whether there is sufficient space for grinding between the bevelled wedge and the press core.

G)Disposal of scrap

(1) the scrap through the hole as large as possible.

2)Sometimes in order to prevent the scrap from blocking, the scrap of the side punching hole needs to increase the top material device.

(3) castings to design the scrap slide over hole to fully consider the width of the maximum size of the scrap if it occurs after rotation.

(4) If the scrap is too long, consider increasing the scrap knife to achieve a smooth slide out of the scrap and increase the strength of the mold.

5) To use the flexible ejector pin convex (concave) die in the following cases.

a) in order to make the scrap slide out piece by piece.

b) want to control the state of the scrap when it falls.

6)If there is a rebound of the scrap.

a) the knife into the mold amount to be large.

b) need to install the scrap ejector device.

7) The following cases need to increase the guide device.

a) there is no empty space on the waste exclusion side, it must be transformed into a vertical fall in a right-angle direction, with a vertical aperture of at least two times the diameter of the punch.

b) If the hole is punched on both sides at the same time, it is necessary to increase the dividing pin.

H) Classification of the standard diagonal wedge die presser.

The press is used to prevent the positioning and deformation of the parts, and can be divided into three types according to the shape and number of action directions.

a) Upper compression material core

The advantages are: the compression force is relatively large, so you don't have to worry about the deformation of the parts; close to the vertical wall and near the end of the side wall, separated by the upper compression core.

b) Slanting wedge side compression core

c) Side compression material and positive compression material share

Insufficient compression force of the side compression material.

Unstable parts.

the positive press material should be pressed 10mm earlier than the side press material on the part.

I) Positioning and anti-lateral force of the slanting wedge

(b) The bevel wedge has two types of pin positioning and key positioning.

(b) A side trimming and flanging, with thicker material requiring measures to prevent lateral forces.

Measures and forms to prevent lateral forces.

Addition of guiding devices.

Translated with www.DeepL.com/Translator (free version)

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Bearing is an important part of the steam turbine, which is divided into radial support bearing and thrust bearing. They are used to bear all the gravity of the rotor and determine the correct position of the rotor in the cylinder.

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Description

Copper alloy inlaid self-lubricating bearing (foreign says deva. Glide) is based on copper alloy substrate, on the friction surface according to a certain proportion to drill out the appropriate size, arranged orderly several holes (diameter phi d 200 mm or less) or blind hole (diameter phi d > 200 mm), the embedded in the hole with a unique lubricating solid lubricant by the precision machining of a kind of high-performance self-lubricating bearings.

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Chemical Compositions

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