Universal milling machine 676P: instruction manual

Functionality check

This process begins with running the equipment at minimum speed, gradually increasing it to the maximum. The machine must operate in the main working gear of rotation for at least two hours, while the spindle supports cannot be heated above 50 degrees.

After checking the unit at idle speed, it is subjected to load. The milling cutter must operate at maximum cutting force in a short-term 25% overload mode. During normal operation in this mode, no vibration is observed and high processing accuracy is maintained.

Design features of the universal milling machine SF 676

In order to fully use the SF 676 milling machine with maximum benefit, you should remember the features of its design. To do this, it is necessary to ensure a constant air temperature of 20C in the room where the machine is located, as well as a relative air humidity of about 65%. In addition, there should be no devices nearby that generate heat energy or vibration pulses. The device has a fairly large scale of circulating reserves and shaft supply, rapid movements and even machine starts.

This functionality in the most favorable modes will be able to provide economical finishing of various kinds of workpieces.

The structure of the universal milling machine SF 676 includes the main sections, and they also determine its specifics. In addition, the equipment in question has a certain number of removable details and accessories; with the assistance of these, its operating resources are greatly increased. The body is fixed on a pedestal made of cast iron, on which, in turn, the fundamental units of the device are embedded. Boxes (feeds and speeds) are placed on the side of the bed.

Advantages

Thanks to its unique features, SF 676 has many advantages:

Acceptability of milling parts of various sizes. Acceptable width is from 250 mm, and length up to 800 mm. Availability of permissibility of chiselling procedures (the nozzle for chiselling is purchased separately);
The presence of a solid volumetric frame made of cast iron ensures vibration absorption and also preserves the properties of parts processed on the machine;
Clear and convenient management of machine functions;
Operation of SF 676 in mechanized and tool shops where single or small production is practiced;
The likelihood of selecting optimal cutting systems due to the expanded circulation scale of both vertical and horizontal spindles;
Introducing coolant using an electric pump. In this case, the pumping capacity will be at the level of 22 l/minute;
Additional spindle head located on the retractable trunk.

This head has the ability to rotate at an angle of 90 degrees. Such rotations also occur in planes that are mutually perpendicular to each other.

Workspace size

The SF 676 kit includes two tables, both of which are functional. Each has individual dimensions and locations: for the vertical version: 630*250 mm, for the horizontal version – 800*250 mm.

Relatively compact volumes make it possible to use the router even in small spaces.

Performance is not affected in any way. Due to its dimensions - 120*124*105, as well as its weight - 1 ton, the machine does not use a large space for operation.

6720B wide-universal high-precision milling machine. Purpose and scope

The tool wide-universal machine model 6720B has been produced by the Odessa Milling Machine Plant since 1982 of the last century and replaced the outdated model.

The machine is designed to perform a variety of milling operations in various planes and at various inclination angles in a wide range of cutting modes. The presence of horizontal and vertical spindles and a large number of accessories allows you to perform the following operations: drilling, chiselling, grinding, boring, trimming ends, marking, milling screw surfaces.

The model 6720B milling machine is designed for milling parts with cylindrical, disk and shaped cutters using a horizontal spindle, and face, end and key cutters using a rotating vertical spindle, which can be rotated at an angle if necessary.

The 6720B machine is used in single and small-scale production in tool and mechanical shops of machine-building enterprises.

The wide technological capabilities of the machine allow it to be most effectively used in tool production.

Operating principle and design features of the machine

The workpiece can be mounted on a main table with a vertical work plane or on a corner table with a horizontal work plane. To process inclined surfaces, the part can be mounted on a universal table.

To process parts that require division, a round table or dividing head can be used.

Using cutting, high-speed, slotting heads and a set of auxiliary tools, you can perform boring, drilling and slotting work on the machine. A detailed description of these devices is given below.

The 6720B machine comes with an easy-to-use tool cabinet, as well as a set of fixtures and tools.

The technological capabilities of the machine can be significantly expanded by using accessories and devices supplied for a special fee.

The machine can perform a number of milling and boring operations with high precision, which can be achieved if the machine is installed in a room with a constant temperature of 20±2°C and humidity of 65±5%, if there are no sources of heat or vibration near the machine. The machine can also perform drilling and reaming, chiselling, centering, counterbore, countersinking, reaming, boring.

The presence of two horizontal and rotary vertical spindles, as well as a large number of accessories for the machine, makes it highly versatile and convenient for working in tool shops of machine-building plants in the manufacture of fixtures, tools, relief dies and other products.

A wide range of spindle speeds and feeds, the presence of mechanical feeds and fast movements ensure economical processing of various parts in optimal conditions.

The machine has mechanized clamping of tools and working parts, which increases productivity.

The lubrication system is centralized. The quality category of the machine is the highest.

Roughness of processed surfaces Ra 2.5 microns.

Machine accuracy class B according to GOST 8-77.

The corrected sound power level LpA should not exceed 88 dBA (without vertical head).

The year the machine was put into serial production was 1982.

Design organization - Odessa Milling Machine Plant named after. S. M. Kirov.

Main characteristics of the 6720B universal milling machine

Manufacturer: Odessa Milling Machine Plant named after. S.M.Kirova.

Dimensions of the working surface of the vertical table (main) – 200 x 500 mm
Dimensions of the working surface of the corner horizontal table – 200 x 630 mm
Distance from the axis of the horizontal spindle to the surface of the corner table – 80..450 mm
The distance from the end of the vertical spindle to the surface of the corner table is 22..392 mm
Maximum longitudinal travel of the table (X) – 300 mm
Maximum vertical table travel (Z) – 320 mm
The largest transverse stroke of the spindle head (Y) is 200 mm
Spindle end – Morse taper 4
Rotation speed limits of the horizontal spindle – 40..2240 rpm
Vertical spindle rotation speed limits – 40..2240 rpm
Spindle drive electric motor – 1.5 kW; 1500 rpm
Machine weight – 1.4 tons.

Headstock

Spindle head 676P

This structural element is also represented by a separate housing in which the gears are located. The structure can move along installed guides, which represents a transverse feed. The decoding of the name of the machine determines that it belongs to the vertical milling group due to the vertical position of the spindle itself. The tool is clamped using a special cleaning rod. Intermediate stops are installed as a limiter. The design features allow for coordinate boring work. For this purpose, an indicator holder and a tile holder were installed, which are necessary for fixing the measuring tile.

In conclusion, we note that the 676p milling machine is suitable for performing small-scale work on metal processing by milling or performing another operation. The model is designed in such a way that it is possible to install additional equipment. Examples include adapter bushings, rotary cleats, mandrels and much other equipment. The maximum stroke of the cutter is 80 meters, the weight of the installed head is 30 kg. Modern analogues of the model can be called TOS Olomuc machines, the production of which is established in the Czech Republic.

If you find an error, please select a piece of text and press Ctrl+Enter.

The 676th series of milling machines, extremely popular during the Soviet era, has not lost its popularity today. Both equipment manufactured in the 70s and 80s, as well as modern modifications of these models, are widely used.

Milling cutter 676F on a Soviet drawing

In this article we will look at the universal milling machine SF-676, study its layout and principle of operation, and also pay attention to the analogue of this model - the 676P milling machine, and find out how they differ from each other

FEATURES AND BENEFITS

The machine allows you to process fairly large parts and workpieces (800 x 250 mm in the horizontal plane). It has a wide range of vertical spindle rotation speeds - this allows you to select the ideal processing mode for any metal or plastic. SF676 received from the designers a convenient system of manual and automatic feeding of the spindle and work table (with accelerated mode). All operations, using high-quality cutters, drills, reamers and other tools, are performed on the SF-676 with high precision.

Owning this machine will bring new opportunities and advantages to the owner:

the ability to rotate the spindle to the right and left by 90 degrees with fixation at any point;
the presence of a second, horizontal spindle;
a large number of additional devices and equipment that significantly expand the possibilities for processing materials.

Among the additional devices and equipment that can be used on this machine, the following should be noted:

slotting head;
universal dividing head;
boring head (with manual adjustment and automatic);
rotary tables;
collet chuck for axial tools;
mandrels for attachment and disk cutters of various sizes;
vice; and much more

The SF-676 milling machine is a good purchase not only for materials processing specialists, but also for engineering and technical specialists of large enterprises, whose work and plans will undoubtedly fit a milling machine with a high degree of versatility, especially if it is purchased directly from the manufacturer. You will be offered a full range of retrofitting for your machine at the lowest prices. Additional equipment and accessories multiply the capabilities of the mechanism tenfold. The costs of machine tooling have a quick payback due to the solution of many specific tasks and, accordingly, meeting the needs of a larger number of customers.

Manual

Today, it is quite difficult to find spare parts for the 676p milling machine, since its technical characteristics are somewhat inferior to those of modern models of milling machines. However, more recently, the equipment in question was installed in many workshops where small-scale and single-piece production was carried out. The instruction manual provides for the installation of additional equipment, for example, for performing slotting operations. This determines the versatility of the equipment. Other features of the model include the ability to rotate the spindle head by a certain degree within the established limit. The operating instructions provide for the use of several manual flywheels to move the table to the cutting tools and rotate the spindle head.

Main design elements

Kinematic diagram of the machine 676P

The design of the 676p universal milling machine is represented by the following main elements:

Functional cantilever milling machine 6t80sh: description of the main components, characteristics

Mains and electric pump switch. The electrical circuit provides for complete de-energization if necessary. In this case, the electrical circuit is made in a classic style, when all power is controlled through the “start” and “stop” buttons.
Control is represented by flywheels, which are used to control the table, spindle and headstock.
The passport determines the presence of a fairly large number of handles, which are responsible for controlling the main elements during the processing of parts.
The main part of the structure is represented by a vertical frame, on the sides of which controls are located. At the top there is a headstock with a gearbox and spindle feed; at the front there is a table with several controls and a feed mechanism. The structure has a base, which, if necessary, can be rigidly fixed with bolts.

Electrical circuit of machine 676P

In general, we can say that the design of this model does not differ significantly from the design of many other models of the vertical milling group. The key feature of the 676p is the ability to rotate the spindle.

Specifications

Design features affect the main technical characteristics of the equipment:

horizontal spindle rotation indicators – 50–1630 rpm;
vertical spindle movement parameters – 63–2040 rpm;
spindle speeds – 16;
maximum advancement of the vertical spindle along the axis is 8 cm;
distance from the axis of the horizontal spindle to the working surface – 8–46 cm;
from the end of the vertical spindle to the working horizontal surface – 0–38 cm;
maximum table travel along – 45 cm;
vertically – 38 cm.

1 dial division is equal to 0.05 mm. The weight of the machine is slightly more than a ton (1050 kg).

6M76P Milling machine support

Milling machine support 6m76p

The support (Fig. 15) serves for longitudinal and vertical movement of the main table II mechanically or manually.

Drive shaft 23 receives rotation from the feed box and transmits it to lead screws 2 and 8, through which feeds are communicated to the table.

Mechanical feeds are controlled by a cross handle; its direction of movement coincides with the direction of movement of the caliper. In the longitudinal direction, mechanical feeds are turned off by mechanical stops 6 and 15, which can be set to the desired size.

Vertical feed is switched off by stops installed on the frame.

The table can also be moved manually using flywheels 17 and 18. The movement of the table is controlled:

millimeter rulers
dials 12.20 with a division price of 0.05 mm
gauge blocks and an indicator with a division value of 0.01 mm

Horizontal milling head

Horizontal spindle 7 (Fig. 16) is mounted in the spindle head, which provides transverse feed. The spindle receives rotation from the gearbox through an intermediate gear located in the frame and gear 9 sitting on the spindle.

The front spindle support is a double-row roller bearing 3 with a tapered hole.

Rear support 8-2 ball bearings. Axial forces are perceived by thrust bearings 4.

The tool in the spindle is clamped using an inertial tool clamp that has an independent drive.

When working with cylindrical cutters, the cutter mandrel is supported by a bracket 20, which can be rearranged along the trunk 17. The position of the bracket is fixed with a clamp 21. The trunk is clamped in the desired position with a wedge.

The headstock is moved by screw 18 and a rotating nut fixed in the frame. The amount of mechanical movement is set by stops 19.

For precise movement, an indicator 22 is installed on the headstock, and end gauges are installed on the tile holder.

bed

The bed 15 (Fig. 17) is installed on the base 19 and is a box-section casting on which the main components of the machine are located, connected to each other by kinematic links.

An electric motor is attached to the base on bracket 17, which imparts rotation to the gearbox and feed mechanisms. The transmission of rotation from the feed box to the feed mechanisms of the table and spindle head is carried out by two chain drives 5 and 8-16. The chains are tensioned by 12 sprockets.

Using a flywheel located in the upper part of the frame, the horizontal milling head is moved manually.

Puller for installing vertical head

The puller (Fig. 27) is designed to install the vertical head into working and non-working positions. The puller consists of a body I fixed to the frame, a bracket 6, two levers 3.4 and two axes 2.5.

Attention! When working with a vertical spindle, disconnect the puller from the vertical head using pin 5

Tool clamping mechanism

The clamping mechanism (Fig. 16; 18) consists of a cleaning rod 10, a nut 12, a flywheel 13 with pawls II and an electric motor 16.

Rotation from the electric motor is transmitted to the flywheel. When a certain moment of inertia is reached, one of the pawls overcomes the force of the spring 15 and transmits rotation to the nut 12 through the driver 14. The cleaning rod, screwed into the nut, receives a reciprocating motion and, with the help of four balls 5, pulls the tool into the spindle with a force of up to 12,000 N.

The clamping (spin) time of the tool is 3-4 seconds. Guaranteed tool clamping with two activations of the mechanism.

Attention! Clamp (squeeze) the tool in the vertical head in the upper position of the sleeve

Gearbox

Feed box of machine 676P

For faster movement, a feed box was installed. A recommendation for using this function is to set the cross handle to the neutral position. This eliminates the possibility of a fairly large number of problems with gears.

The piston pump significantly extends the service life of the structure. Its intended purpose is to supply a lubricating fluid, which helps reduce friction. The design of the piston performs a reciprocating movement, due to which the lubricating fluid is sucked in and supplied to the friction area. To control the degree of lubrication, the 676p milling machine has a transparent eye, through which the process of oil mist formation in the gear friction zone is monitored.

Technical characteristics of the wide-universal milling machine 676, diagrams

Functional characteristics and features of use of the SF 676 milling machine. Design. Electrical and kinematic diagram. Analogues and modifications.

The model 676 milling machine is designed for milling parts with different types of cutters. The cutters are used shaped, disk or cylindrical. They turn parts using a machine spindle whose axis is horizontal. It is also possible to turn parts with other cutters. These include end, key or end. This will involve a rotating spindle.

An important factor when choosing in favor of the SF 676 will be the permissibility of carrying out work with the synchronous activation of both spindles. In such circumstances, the machine will be able, in addition to milling, to perform countersinking, drilling, and boring.

General view, controls

The SF-676 machine belongs to the normal class in terms of processing accuracy. The shafts located in both planes are located in the spindle head and are connected to each other by a gear train. The guides are located horizontally, and on top of them there is a diametric feed of the spindle head, which produces a transverse movement.

The high-speed mechanism is equipped with 16 modes, which are communicated to both shafts. According to the passport, it is easy to attach a vertical type shaft to the extreme edge of the headstock. The equipment is equipped with two work tables. Main machine controls:

handle for clamping the table in different positions: vertically and horizontally;
spindle head reverse;
handle for turning on speeds;
handle for dialing speeds;
flywheel to control the movement of the spindle manually;
spindle head mechanics handle;
local lighting on/off button;
start and stop for main engine;
movement of the table vertically in manual mode.

At the base of the equipment there is an electric pump, which drives the cooling liquid and also serves as a container for the coolant.