At the international Autumn Technical Fair – Plovdiv' 2004 , the new model of a surface-grinding machine with electro-mechanical control SHPH 40.82 was presented with big success.

No	Parameters			SHPH 30.62		SHPH 30.82	SHPH 30.102	SHPH 40.6 2	SHPH 40.82	SHPH 50.82
1	Table working surface sizes [mm]
Width		300			300	300	400	400	500
Length		630			800	1000	630	800	800
2	Maximal sizes of the processed detail [mm]
Width		320			320	320	450	450	520
Length		670			800	1000	670	800	800
Height (new disk)		400			400	400	400	400	400
3	Transverse stroke		310			310	310	445	445	510
4	Automatic vertical feeds range
Fast stroke m/min	0,2
Continued, mm	0,001-0,045
5	Minimal vertical movement of the abrasive disk, mm	0,001
6	Transverse feeds range
Non Continued m/min	0,15-1
Continued mm	0,2-15
Fast stroke m/min	1,2
7	Longitudinal speed range , m/min	1,5-25
8	Abrasive disk sizes [mm]
Outer diameter				D=300, V max = 45 m/s
Width	40
9	Abrasive disk revolutions per minute, U/min	1500 / 3000
10	Main motor power, kW	3,2/4
11	Overalls [mm]
Length		2800			2800	3100	2800	2800	2800
Width		1800			1800	18 00	19 00	19 00	4300
Height	2000
12	Weight, Kg		3200			3400	3500	3600	3700	43 00

Application Area

The Surface Grinding Machines SHPH with cross table and electro-mechanical control are designed for plain grinding with the periphery or the face of the abrasive wheel.

These machines provide high accuracy and cleanness of surfaces processed with minimal waste of machine and auxiliary time.

The precision of the machines respond to the BSS (Bulgarian State Standard) 15817 ”Metal Cutting Machines. Surface Grinding with horizontal spindle and cross rectangular table. Precision norms.” and DIN 8632 T1 “Werkzeugmaschinen; Planschleifmaschinen mit Waagerechter Schleifspindel und beweglichem Rechtecktisch bis 1600 mm Schleflange; Abnahmebedingungen.”

A short Technical Desription

Machine Layout .

The main rotation is the rotation of the abrasive wheel.

The feeding working movements are three types: longitudinal, transverse and vertical.

The layout of both SHPH 40.82 and SHPH 50.82 is the same as in all models from the surface grinding machine types, with a “cross table” – the abrasive wheel executes the vertical motion; the processed part executes the longitudinal and the transverse motion.

The fact that the guideways along the three axes of the rectilinear movements are rolling, allows big precision and achievement of a big range of speeds, including speed values, which are close to zero. Along the longitudinal and the transverse axes, linear rolling guideways from the type “KUVE” of “INA” company are used. The integration of these elements has significantly improved the overall stability and precision of the machine.

Basic movements

Longitudinal movement

With the other models of grinding machines, the longitudinal motion is accomplished through a hydraulic cylinder ; with SHPH 40.82 and SHPH 50.82 the motion is caused by a DC high-torque motor. The rotational movement of the electric motor is transformed into rectilinear movement of the table through the “attachment “ of the table to one section of a gear-to-belt drive. The extent of the run is regulated with noncontact sensors and the maximal value is 710 / 900 /1100 mm; the speed is smoothly regulated within the range of 1.5 – 25 m/min.

Transverse movement

The transverse movement is performed by the cross table, which carries the upper table with a fixed processed part.
The transverse movement can be both automatic and manual. In both cases the rotational driving movement is converted into rectilinear movement by a screw-nut gear (for higher accuracy the nut consists of two parts, which are pressed one toward another by springs, which results in zero tolerance).

The fine manual feeding has minimal increment of 0,001 mm, the coarse manual feeding - 3 mm. per one revolution of the relevant flywheel.

The transverse automatic movement for the previous models was accomplished by hydro motor, while the movement for SHPH 40.82 and SHPH 50.82 is caused by a DC high torque motor. There are two auto feeds: continuous and non-continuous (stepped).The run size is set by a contact sensor and two mobile cams. The continuous feeding speed is steplessly set) in the range of 0.25 – 1.3 m/min.; non continuous speed - 0,1 – 15 mm./run.

The maximal transverse run is: 310 mm for SHPH 30.**; 445 mm for SHPH 40.**, 510 mm for SHPH 50.82 mm.

Vertical movement

The Vertical movement is performed by the carriage, carrying the grinding spindle with the abrasive wheel.

The vertical movement can be both manual and automatic.

The minimal fine manual feed incremental is 0,001 mm, and the coarse manual feed increment is 1 mm per 1 revolution of the relevant flywheel.

The vertical automatic feed is the same as in the other SHPH models with a cross table. It is hydraulic and is regulated within the 0,001 – 0,045 mm range through intervals of 0,001 mm. The end of the automatic feed (i.e. the achievement of the final size) is regulated by a contact sensor. The hydraulic aggregate for this mechanism is a separate element with small dimensions and is mounted inside the machine body. This aggregate is switched on only when the automatic vertical feed is used, and does not work during the rest of the time.

Abrasive wheel rotational movement

The grinding spindle is driven by a two-speed induction motor by means of an elastic clutch.

The spindle assembly uses four precise radial-axial rolling bearings, mounted with a preload. The grinding wheel flange is based on the spindle along a precisely processed conical surface. The allowable radial beating of this conical surface towards the axis of rotation is 0,003 mm.

The sizes of the grinding wheels are standard for all grinding wheel manufacturers. Special disks, used to grind with their faces are available after preliminary order. The actuation by a two-speed electric motor allows the achievement of more revolutions per minute after the diameter of the abrasive wheel has weared out to a certain degree, resulting in reaching optimal peripheral grinding speeds.

Advantages of the Electro-Mechanical Control Type

The main advantages, which are achieved by replacing the hydromechanical control with electromechanical are:

· Extremely low noise level during the machine work.

· The elimination of a serious source of high temperature – the hydraulic aggregate and the hydraulic oil, which cause thermal deformations and aggravation of the precise operation.

· Better and more gradual regulation of the moving speeds, which in combination with the assembly of closed linear rolling guideways, type “KUVE” of “INA” company increases the technological possibilities and precision of the machine.

· Simpler exploitation; it is not necessary to use hydraulic oil any more.

· A lack of possible leaks from the hydraulic system; increasing the overall reliability and ease of repairs for the machine.

· Lower utilization of electric power.

New Improved Design and Ergonomic Features of the machine

The surface-grinding machines SHPH 80.42 and SHPH 80.52 have new and improved external design. Some of the essential constituent assemblies and protective frames are with new shapes. The Control Panel is formed as an independent element, carrying in its rear section the electric box with all electric systems.. This facilitates the work with the machine. Some new functions are provided, such as light indication when a final size is reached (during automatic vertical feed), possibility for vertical feed either on one or two reversals of the upper table, etc.

Machine Equipment

Each of the machines can be equipped with the following accessories:

Precise vertical movement counter ( indicator counter )

Numerical indication towards vertical axis with an incremental step 0,001 mm. (Numerical display and measuring line),

Numerical indication towards transverse axis with an incremental step 0,005 mm. (Numerical display and measuring line),

Numerical indication along vertical and transverse axes

Electric magnet table with fixed straps and bolts,

Precise Vice for fixing the processed parts

A stand for static balancing of the abrasive wheel

A mandrel for balancing the abrasive wheel

Grinding wheel periphery plain sharpening device

Radial sharpening device

Angle sharpening device

Grinding wheel periphery and front sharpening device

Aggregate for cleaning the coolant on a cyclonic (centrifugal) principle ;

Aggregate for cleaning the coolant on a gravitational (sedimentational) principle ;

Aggregate for cleaning the coolant on a gravitational (sedimentational) principle with additional cleansing through permanent magnets,

Aggregate for cleaning the coolant, using an electro-magnetic principle

Local lighting,

Fast wearing spare parts kit ( for 5000 working hours )

A set of tools for maintaining the table

Electromagnetic table

Service machine tools