Spherical lapping tools

Manufactured to Specifications. If it's spherical, we can help. Precision Metal Balls and Spherical Components. If it is spherical, we can help. Balls Learn more. Valve Balls Learn more. Modified Balls Learn more. Gage Balls Learn more. The main drawback of this design is that it lacks the self-centering feature of the cone see Figure 4.

The ball contact angle on the flat seat design is determined by the ratio of the through hole diameter to the ball diameter. The higher up on the ball, that is the steeper the included angle, the better the seal, but the poorer the balls release function will be. Design wisdom seems to have settled on 45 degrees per side or a 90 degrees included angle see Figure 5.

The ultimate in zero leakage ball seat designs is the Tri-Point Seat. A significant feature of a sphere is that it has a single radius in all directions. This uniquely perfect geometry is used to form the ultimate ball seat. At the intersection of two concave spherical surfaces, of two different diameters, there will occur a perfectly circular land.

There are no concentricity errors and there are no squareness errors. The two concave spherical cups are almost always generated by lapping. In practice the two spherical cups are usually 10 to 15 percent larger than and smaller than the valve ball. A very narrow spherical land. It is important that the width of the spherical lands be limited to 0. The material used in these seats is usually a high tensile, high hardness metal. Because very high Hertzian Elastic forces result from this design, very low pressures can be sealed to zero leakage.

Even Hydrogen and Helium gas can be controlled with this ball seat design. For the very same reason that it works so well at low pressure, this seat is limited for high-pressure applications. As the pressure on the ball goes up, the elastic limit of the seat material will eventually be exceeded and the sealing land will be brinelled into a broad spherical cup that will no longer seal.

A high force may cause cracks in the seat area. How does the belt comply with your out of round body? Ball seats function on the same principals. Even with the best achievable geometry and the finest surface finish of the ball and seat, it will still have some leakage.

The inhomogeneous crystallographic structure of the metals is huge when compared with the atomic dimensions of gases and liquids. In order to totally eliminate all leakage, enough force must be applied to the ball to achieve mechanical compliance between the contacting surfaces.

A small amount of Hertzian Elastic Deformation is required to close the tiny undulations in the surfaces of the ball and the seat. When the ball check is in the sealing mode, the pressure of the liquid or gas, will be forcing the ball down against the surface of the seat thus increasing the sealing force.

The somewhat illogical fact is that very low pressures are much more difficult to achieve a zero leakage seal than higher pressure. Designing a ball check valve starts with the diameter of the through hole. The diameter of the through hole is determined by the required flow rate, which is in turn dictated by the Reynolds' number, the fluid pressure and the Kinematic viscosity of the solution or gas. Charts and graphs that will give close estimates of the through hole diameter are available in Mechanical Engineering Hand Books.

The seat configuration can be chosen by applying logic to the earlier discussions. The ball diameter is dictated by the through hole diameter, the seat configuration and the desired contact angle between the ball and the seat.

In order to provide a zero or near zero leak rate, the spherical seat of a ball valve must be accurately lapped within micro inches tenths of micro-meters. Our diamond charged lapping tools will generate this quality almost automatically, and it only takes a matter of seconds. With such a high degree of geometric accuracy required to achieve a leak tight seal, it is not surprising that press fitting a lapped seat into a housing can cause serious problems.

If press fitting is to be accomplished successfully, serious restrictions must be adhered to. The outside diameter of the seat should be precision ground to provide excellent roundness. The housing should be precision bored or even better honed very round. The seats should be designed to be very robust and the least possible press fit or interference should be used.

If a press fit must be used, can the seat be diamond lapped after it has been pressed into place? Alternatives installation techniques, such as gluing or of using threaded parts and resilient seals should be considered in the design.

The majority of ball-check valves have at least a light spring pressure forcing the ball against the seat and when the ball check forms a relief valve the spring may be substantial. In most spring loaded applications, the force is supplied by a helical compression spring. For small spring loads, the end coil of the spring sits directly on the surface of the ball, on the side opposite the ball seat see Figure 3. When applying a heavy force, a spring guide plate is added to the design.

This device has a spherical or conical cup that fits over the ball on one side and an extended boss on the opposite side that locates on the inside diameter of the spring. The mass of a specific diameter ball is fixed.

As the design parameters of the valve are changed, to accommodate a larger flow rate, the diameter of the ball must increase. An increase in the mass of the ball will cause the reaction time of the valve to slow down and the increased inertia of the large ball will pound the living daylights out of the seat. By substituting a large, lightweight, spherical tipped poppet for the massive sphere, the good self-alignment and excellent sealing qualities of the ball are preserved with a fast reaction time and only moderate wear of the components see Figure 8.

We can manufacture the spherical poppets for you, or we can precision lap the spherical end of the poppets you supply to a high degree of perfection so that they will form a seal comparable to a high quality ball. As the diameter of the ball decreases, the actual resulting force on the ball seat goes way down. Reiterating the fact that you must have some elastic compliance between the ball and the seat to achieve a zero leakage seal, the overall quality of the seat and the ball itself must be much better for very small valves.

The sensor 40 may be a code or a frequency output or with built-in ADC. Current options - F p , S, I - speed drives, the amplitude of the swing priter relative to the treated surface, etc. For each size, machined parts are required sizes priter 12 ensuring conditions:. Compared with the prototype of the proposed solution provided increased accuracy and performance tuning due to the automatic control of the pressing force of priter and non-deterministic trajectory of its movement on the treated area.

Introduced in the proposed device swivel priter actuators eliminates the characteristic of the known technical solutions "yaw" priter relative to the machined surface at its entry and exit from the anticipated design of spherical inhomogeneities of the surface - holes and depressions.

Nozzle grinding and polishing. Device for grinding spherical surfaces. BI No. The processing method of the spherical surfaces. Method of finishing a spherical surface including the rotation ring priter and the workpiece, and eUSA holes and hollows, swing priter relative to the center of the processing space and the creation of the efforts of the clamping priter the workpiece to a spherical surface, characterized in that the contact pressure of priter to machined spherical surface set by Executive electromagnetic site and carry out automatic control of the supply current windings depending on the current value of the square of the interaction of priter with the machined surface of the part to ensure conditions of constancy of specific pressure priter on the surface.

Device for finishing spherical surfaces containing ring priter, the rotational drive of priter and spherical parts with holes and hollows, drive swing priter relative to the center of the treated areas and adjust the strength of the clamping priter to the processed surface, characterized in that the regulator's efforts clamping priter to the processed surface made with the Executive electromagnetic unit having a magnetic core with a winding and an armature, and with automatic current control power windings depending on the values of the square of the interaction of priter with the treated surface and providing a constant surface pressure of priter on the surface.

The device according to claim 3, characterized in that the anchor Executive electromagnetic Assembly is provided with a sleeve, in which the top is installed priter through the swivel, and the bottom placed with possibility of vertical movement of the output shaft rotation priter.

The device according to claim 3, characterized in that the scheme of automatic control of the supply current of the winding of the electromagnetic actuating node has consistently enabled sensor square interaction priter with the treated surface, analog-to-digital Converter, a processor, coloplasty the source of current supply to solenoid Executive node, and connected code outputs to the processor, the sensor size of the air gap in the magnetic circuit of the electromagnetic actuating node.

The device according to claim 3, characterized in that the diameter D CR priter selected to ensure conditions. The device according to claim 3, characterized in that priter associated with drives its movement through W is mirnyj connections.

The device according to claim 3, characterized in that the value of current I m the power winding of the electromagnetic actuating node is determined by the processor according to the formula. Units for holding ground drilling heads and supporting system with means for realizing feed pressure of grinding machine are provided. Grinding cup is made with possibility rotation at varied controlled revolution number.

Supporting system operates at using controlled varied pressure of feed of grinding machine. Machine included control system for controlling said functions and its other functions. Control system includes rows of mutually connected control modules including control board for operator and programmed module of inspection plate.

EFFECT: possibility for gradual increase of grinding parameters, setting their different combinations, enlarged manufacturing possibilities, improved efficiency and quality of grinding due to lowered load and wear of grinding cup. FIELD: machine engineering, possibly centerless circular grinding in processes of large-scale production of simple configuration blanks.

SUBSTANCE: method comprises steps of placing blank between grinding and driving wheels on supporting guide; providing possibility for automatic target changing at grinding process distance between said wheels and arrangement of supporting guide along height and or its inclination position.

In order to realize it, at least one wheel is mounted in headstock moving across axial direction of blank and supporting guide is set at least by means of one servo-drive. Optimal regulation of positions of wheels and supporting guide is provided by means of control device. Programming unit is used for controlling said control device according to preset working program taking into account changes necessary for predetermined type of part.

Working program is performed depending upon time period of grinding; such program is repeated for each individual part. Micro-scratches should not be confused with deeper scratches produced by particles of contamination or other causes. The Lapmaster Wolters SPL has been developed to produce a Convex or Concave scratch-free, high quality surface on spherical components.

The machine can also match lap a range of mating sphere components such as, Hydraulic timing valves. This system is effective on most materials including ceramic, graphite, ferrous metals, alloyed metals and stellite coatings. A scratch free, matt high-quality surfaces is obtained on the Ball Valve and Seat.

The machine match laps two Seats to the valve, achieving a perfect mechanical seal for any pressure requirement. They all need high-quality, high-precision, stable and well-engineered machines to manufacture high-quality work pieces. Founded in Chicago in as a manufacture of lapping and polishing machines for the mechanical seal market, Lapmaster has grown to a worldwide solution provider for more than 20 industries like precision optics and advanced materials.

Since Barnes has been considered a world leader in developing innovative honing and bore finishing technology and processes. The earliest Barnes honing machines were the first to make honing a practical and efficient means of finishing automotive cylinder bores in a production environment. With the addition of ISOG to the already existing strong brands within the Group, PSS further strengthens its position as a leading supplier of high quality, best in class technologies in the market of surface quality enhancement solutions.

Today, the aba Grinding Technologies is exclusively focused on the advancement and production of precision surface and profile grinding machines. Founded in , KEHREN is a well-established designer and builder of high-precision grinding machine tools and systems under the following categories: vertical grinding centers, vertical grinding centers with portal design, surface grinders with rotary tables and horizontal spindles, and surface grinders with dual rotary tables and vertical spindles.