SK8942Y1 - Variable jig for bar blanks separating by wire electro-erosive cutting - Google Patents

Abstract

The variable jig for bar blanks separating by wire electro-erosive cutting consists of a base (1) on which a fixed jaw (2) of prismatic shape with a longitudinal scale (8) and a movable jaw (3) of prismatic shape are attached in one axis. The base (1) has a recess (15) between the fixed jaw (2) of prismatic shape and the movable jaw (3) of prismatic shape. A first stirrup clamp (4) with a clamping screw (6) for clamping a blank (7) and a second stirrup clamp (4) with a stop screw (5) of a stop (9) are slidably inserted into the fixed jaw (2) of prismatic shape. A third stirrup clamp (4) with a clamping screw (6) for clamping the blank (7) is slidably inserted into the movable jaw (3) of prismatic shape.

Description

Technical field

The technical solution relates to the construction of a variable device for cutting bar blanks by wire electroerosive cutting to prevent the formation of burrs. The technical solution generally falls into the field of mechanical engineering and production techniques}.

Prior art

From the current state of the art, clamping systems for wire electroerosive cutting are known, which focus mainly on quick replacement of parts, repeatability of clamping, positioning accuracy, intuitive operation, or versatility of use (GF Machining Solutions - Wire eutting EDM 2019). They are mostly based on the construction of clamps, vice (EROWA - Wire EDM Tooling System 2019) or chuck (F-Tool International 2019).

Other known clamping jigs are mainly used for clamping metal parts of complex shapes in dividing devices, clamping plates or directly with the machine table by means of clamps (Gin Khan - Wire EDM Clamp 2019).

The advantage of these clamping devices is that they allow precise and wide possibilities of clamping components of various shapes, where the production of finished products is created and the rest of the material that is cut off is waste.

The disadvantage of these fixtures is that they are not applicable for a specific purpose, such as cutting carbide rods for cutting tools or samples for metallography, where the finished products are formed from both sides. This is due to the fact that these specific purposes occur in small quantities in industrial production.

There are usually products on the market that use prisms, resp. prism-shaped jaws for measuring cylindrical parts or clamping these parts for certain machining methods. However, it is not known that such or a similar preparation is used for wire electroerosive cutting, which is adapted to quickly adjust the length to be cut and which would prevent the formation of unwanted burrs.

In wire EDM cutting, one end of the bar is broken before gravity is cut before it is cut. This results in the formation of a small part of the uncut material - burr. This undesirable phenomenon always occurs due to the gradual reduction of the cross-section during cutting. At a certain critical distance of the wire from the edge of the rod, this cross-section is already so small that it cannot support the weight of the part to be cut and mechanical fracture occurs. It is a small part of the uncut material, which protrudes from one part of the rod in the form of a protrusion and from the other part this part of the material is missing in the form of a break.

The formation of protrusions and fractures is undesirable for several reasons. In industrial production, the front part of the products does not remain straight, which negatively affects the length of the product or makes it impossible to adequately fit the front surface, for example during assembly. When cutting carbide rods as blanks for cutting tools, the resulting undesired protrusions cause problematic clamping of high-precision chuck chucks on tool grinders, where these chicks damage from their inner diameter. A break would adversely affect the future geometry of some types of cutting tools, and it is therefore necessary to shorten the bar until the break is completely removed. In the research field, in the preparation of samples for metallography, the protrusions cause damage to the grinding and polishing wheels.

The protrusion in the form of a protrusion must therefore be removed by subsequent rewinding and re-clamping of the rod in a wire cutting machine or other machining operation, such as grinding. This increases not only the production time required for machining but also the production preparation time, such as bar clamping, tool measurement and . This increases the total cost of tools and machining, including machine operation.

These shortcomings evoked the design of another tool machining system, where the axis of the trap in the form of a protrusion would not be formed, which resulted in the design of a variable preparation for cutting bar blanks by wire EDM, which is described in this utility.

The essence of the technical solution

The stated shortcomings in the prior art are eliminated by a variable preparation for cutting bar blanks by wire electroerosive cutting according to the present technical solution. The essence of the solution are features where the jig consists of a base on which a fixed jaw of prismatic shape with a length scale - a ruler and a movable jaw of prismatic shape is attached in one axis. Between the fixed prismatic-shaped jaw and the movable prismatic-shaped jaw, the base has a wire recess recess that is longer than the width of the prismatic-shaped jaws to ensure the entire cutting of the bar blank and the safe running of the wire from the cut. It slides into the fixed jaw of a prismatic shape

S K 8942 Υ1 inserted first caliper clamp with clamping screw and second caliper clamp with stop stop screw. A third caliper clamp with a clamping screw is slidably inserted into the movable jaw of a prismatic shape. The movement of the movable jaw of prismatic shape serves to regulate the distance at different lengths of bar blanks. Two holes with a recess for clamping on the base are made in both jaws of prismatic shape. Each prismatic jaw contains caliper clamps. The first and third stirrup clamps include a clamping screw for exerting clamping forces to clamp the bar blank. In addition, the fixed prismatic jaw comprises a second caliper clamp with a stop screw and a stop. The punch screw has a hole in the cylinder head for the possibility of a stronger tightening of the stop. By turning the clamping screws, the distance of the end of the screw from the prismatic jaw is changed, which allows the insertion of rod blanks of different diameters. The jaws of the prisms themselves are screwed to the base with Allen screws. The recess on the prismatic jaws is deep enough so that the Allen screw head does not protrude. The fixed prismatic jaw is screwed directly to the base, where threaded holes are formed for this purpose. The movable prismatic jaw is clamped by means of hexagon nuts which are inserted into an oval groove. This groove is designed so that the prismatic jaw 15 can be moved (after loosening the screw) and at the same time to prevent the nuts from rotating. The other holes are used to clamp the base of the jig to the work table of the wire EDM machine.

The advantages of the structural solution of a variable preparation for cutting bar blanks by wire electroerosive cutting according to the technical solution are obvious from its effects, which are manifested externally. The effects and originality of the present device lie in the fact that the use of the jig ensures clamping of the cut part of the bar, quick adjustment of the cut length and precise securing of the position against angular rotation, thus eliminating these negative effects. By clamping the originally free end of the rod, the clamping forces equal the gravitational force, thus ensuring that the wire cuts through the entire cross-section and no fracture occurs. Furthermore, the milled recess on the base of the jig ensures the run-out of the wire from the rod. Clamping jaws with a prismatic shape in the groove, milled to a dimensional tolerance, always ensure the exact position of the cut bar and prevent its angular rotation. Both ends of the cut bar are clamped by a universal stirrup clamping system, which allows the clamping of different bar diameters. The movable jaw of prismatic shape allows the setting of the desired position for clamping rods of different lengths. The fixed jaw with a ruler ensures quick adjustment of the cutting position to different bar lengths. The stop placed on the fixed jaw will ensure repeatability of production of products of equal lengths.

Overview of figures in the drawings

The variable preparation for cutting bar blanks by wire electroerosive cutting according to the technical solution will be further explained in the drawings. In FIG. 1 is a top and front axonometric view of a variable device. In FIG. 2 is a top and rear axonometric view of the variable device. In FIG. 3 shows the assembly of the whole device in an axonometric view from its lower part.

Examples of embodiments

The individual embodiments according to the technical solution are presented for illustration and not as limitations of technical solutions. Those skilled in the art will find, or be able to ascertain using no more than routine experimentation, many equivalents to specific embodiments of the invention. Such equivalents will also fall within the scope of the protection claims.

Optimal design cannot be a problem for those skilled in the art, so these features cannot be addressed in detail.

Example

In this example of a specific embodiment, the construction of a variable jig for cutting bar blanks by wire electroerosive cutting to prevent the formation of burrs is described, which is shown in FIG. 1 to 3. The essence of the construction of the variable jig according to the technical solution is that it consists of a base 1 on which a fixed jaw 2 of prismatic shape with a longitudinal step 55 and a movable jaw 3 of prismatic shape are mounted in one axis. Between the fixed jaw 2 of prismatic shape and the movable jaw 3 of prismatic shape, the base 1 has a recess 15. A first stirrup clamp 4 with a clamping screw 6 and a second stirrup clamp 4 with a stop screw 5 of the stop 9 are slidably inserted into the fixed jaw 2 of the prismatic shape. 3 of the prismatic shape, a third stirrup clamp 4 with a clamping screw 6 is slidably inserted. The movable jaw 3 of the prismatic shape is fixed to the base 1 in oval grooves 13 by Allen screws 10 and hexagon nuts 12. Fixed jaw 2 of the prism

S K 8942 mal1 tiny shapes to the base 1 fastened with screws in the threaded holes 11. The base 1 has clamping holes 14 for the work table.

Industrial applicability

The variable preparation for cutting bar blanks by wire electroerosive cutting according to this technical solution is used mainly in the engineering industry in the field of preparation of tool blanks for shank cutting tools. The tool could find application as part of the equipment of wire electroerosive cutting machines to increase the accuracy and quality of the cut. Also, a variable preparation for cutting bar blanks in wire electroerosive cutting to prevent the formation of burrs could find application in industrial production within companies engaged in machining and material cutting. This preparation could be used in the research field for metallographic sample preparation.

Claims (4)

CLAIMS FOR PROTECTION Variable device for cutting bar blanks by wire electroerosive cutting, characterized in that it consists of a base (1) on which a fixed jaw (2) of prismatic shape with a longitudinal scale (8) and a movable jaw (3) are mounted in one axis. prismatic tvam; the base (1) has a recess (15) between the fixed jaw (2) of prismatic shape and the movable jaw (3) of prismatic shape; a first yoke clamp (4) with a clamping screw (6) and a second yoke clamp (4) with a stop screw (5) of the stop (9) are slidably inserted into the fixed jaw (2) of the prismatic shape; a third stirrup clamp (4) with a clamping screw (6) is slidably inserted into the movable jaw (3) of the prismatic shape. Variable device for cutting bar blanks by wire EDM according to claim 1, characterized in that the movable jaw (3) of the prismatic shape is fixed to the base (1) in the oval grooves (13) by Allen screws (10) and hexagon nuts (12). ). Variable device for cutting bar blanks by wire EDM according to claim 1, characterized in that the fixed jaw (2) of prismatic shapes is fixed to the base (1) by means of threaded holes (11) Variable device for cutting bar blanks by wire EDM according to claim 1, characterized in that the base (1) has clamping holes (14).