JPH028868B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a clamp for clamping machining parts. The clamp consists of one wedge-shaped piece with a cut-out tip, or two pieces with cut-out tips arranged symmetrically with their tips facing each other, and a clamp that tightly contacts the inclined side surface of the wedge-shaped piece. the wedge-shaped piece has a hole for the tightening member, and is moved by the tightening member in a direction perpendicular to the end surface. Its movement causes the machined part to be clamped between the clamping jaw and its opposite surface.

Tightening clamps used for machine tools can be roughly divided into four types, and they have the following drawbacks.

Using multiple clamps on a single component increases replacement time and occupies more space.

When performing a large number of tightening operations using edge clamps (compound state tightening), there is a drawback that dimensional errors occur due to the combination of errors and the rise of parts from the tightening surface.

The method of fixing the iron, etc. to be tightened from the top end is not suitable for group tightening, and the reason for this is that there is a risk of the tool colliding with the iron, etc., and even end milling of the top end surface is impossible. can be mentioned.

When using group clamps for multiple parts, there are in fact very different ways. The operator must make the necessary installation groups himself or have someone else make them, and there are no available solutions for group clamps available from tool salespeople.

With the development of machine tools, the demands placed on the clamping of machined parts have also increased. The era has shifted from the era of one-step jigs to NC or numerically controlled machining. This situation can be seen most clearly, for example, in the case of numerically controlled machining centers. In the machining center, a very large number of machining parts must be placed within the effective machining range of the machine tool. In such a case, if the tool is replaced too many times, the work required will be time consuming and the working capacity will be reduced, so it is necessary to avoid having to replace the tool too many times. During just one work cycle, it is programmed to use several dozen different tools to perform various operations such as surface milling, notch cutting, boring, thread cutting, etc.

In the tightening clamp according to the present invention, the wedge-shaped piece has at least two inclined side surfaces, and at least two tightening jaws (jaws) are in close contact with the side surfaces, and the wedge-shaped piece has different side surfaces. The main feature is that two or more machining parts can be tightened together.

When using the clamping clamp according to the invention, clamping forces are generated by the clamp towards both the clamping base and the surrounding guide frame.

With the multi-directional tightening clamp according to the present invention, the entire component can be attached and detached in one operation, thereby reducing the time required to replace the component.

The conical part provided on the component of the tightening clamp is
This has important implications regarding the desired clamping force, especially the ability to resist large forces during machining. Multipurpose fasteners are suitable for the majority of fastenings. Due to the expansion of the fastener, the clamp presses the part against the guide frame and completely prevents any loosening from occurring relative to the mounting base.

Due to the lateral sliding of the jaw and the large diameter central hole in the clamp, dimensional deviations of the parts during tightening are tolerated. Tightening accuracy is determined by the accuracy of the guide frame. The most reliable results will be obtained if the finishing of the guide frame is performed on the same machine.

Since the fasteners are hidden between the parts, machining can be carried out over the entire area with a face cutter or the like without any risk of collision. It must be noted that in NC machines, hundreds of program statements may be required to perform one cycle of operation, even for the smallest evacuation operation.

Tightening clamps are preferred because they are reliable in operation and simple in construction, and one of their most advantageous features is their versatility. If necessary, a special piece can be placed between the mounting base and the clamping clamp to raise the clamping surface. When installing the tightening clamp on the base, only one screw hole needs to be provided in the base. Since it can be quickly replaced, the same clamp can be used on multiple different bases. The tightening clamp is small and highly efficient, so it occupies only a small amount of space on the installation base.

The invention and its various applications will be explained in more detail with reference to the drawings.

1 to 5 show an embodiment of a tightening clamp according to the present invention. The tightening clamp comprises two pieces 3, 4 with a hole 1 in the center.
The pieces 3 and 4 have a conical shape with a cutout and a wedge shape, and both ends face each other. Two jaws 2 are placed between the sides of the cone. The inner surface of the jaw 2 is inclined, and the inclination corresponds to the inclined surface of the cone, and the protuberances thereof protrude toward each other and occupy a position between the two cones. It's summery. The jaws 2 are connected to each other by a spring 5. The spring 5 is passed through a hole provided in the jaws 2, and is adapted to pull the jaws 2 together.

When using the tightening clamp according to the invention, the clamp is fitted between two parts 10 which are to be fixed to the base 8, as shown for example in FIG. The base 8 is provided with a hole 13, the thread of which corresponds to the thread of the bolt 7. The diameter of the bolt 7 is somewhat smaller than the diameter of the hole 1 in the cones 3, 4. The bolt 7 is inserted into the hole 1. When the bolt 7 is turned and tightened, the bolt 7 pushes the upper cone 3 downward, thereby causing the tightening jaws 2 to move outward and away from each other. The clamping jaw 2 thereby presses the part 10 against both the base 8 and the frame 9 surrounding the base 8. In FIG. 3, the forces acting in this case are indicated by arrows A.

Figure 6 shows the tightening group base of the NC machining center. For convenience of illustration, different types of tightening groups are shown on the same group base 8. The drawing shows the clamping clamps between the parts 10 as well as the guide frame 9 surrounding the parts 10.
It shows the position of. For clarity of illustration in the drawings, the following different types of pieces are shown in groups.

3-way clamps for parts of different types 4-way clamps for round or square parts 2-way clamps for parts of different shapes, e.g. rectangular or plate-shaped
Square Clamp In a four-sided clamp, the cones 3, 4 have four chamfered sides, and the four jaws 2 are fitted into the sides in pairs with opposite ones. Since the clamp is hidden between the parts, it is possible to cut the entire surface flat, and there is no risk of tool collision during NC boring without any additional programming.

The embodiment of FIG. 6 also shows a practical example of a heterogeneous tightening group basis. Tightening clamps have been used on a trial basis in their base and the results have been excellent. Tightening accuracy exactly matches the guide frame. The tightening clamp can be opened and closed with extremely light movements.

Figures 7 and 8 show what is called a bundle.
An example of application when used for tightening is shown. In this tightening, the tightening clamp 12 is placed in the center of the bundle of rectangular parts 10 to be tightened, so that dimensional deviations and rises are significantly reduced compared to, for example, when using edge clamps.

9 and 10 show group tightening of a long part 10 using two sets of tightening clamps 12 and an intermediate tube 1.
1 and a long screw 7 are shown. When screw 7 is tightened, both clamps 12 act simultaneously to hold part 10 on base 8 and frame 9.
Push towards.

FIG. 11 shows another embodiment of the tightening clamp. Instead of a clamping jaw with two chamfered sides, a semi-joist 6 is used together with the cone 3, forming a so-called lower clamp. This cone 3
Due to this action, the jaw 6 moves with respect to the tightening base 8 without any play.

In the above description of the invention, the base 8 is placed horizontally below the component to be clamped, but of course the invention applies equally to the clamping of components against a vertical base, for example. be able to. In that case, instead of placing one cone 3 above the other cone 4, both cones 3, 4 are juxtaposed such that the center line of the hole lies horizontally.

In addition to the base with threaded holes, the clamp can also be attached to the T-groove of the machine using bolts and nuts. A hydraulic cylinder can also be used as a tightening member.

It is also possible to make the inclined side surface of the wedge-shaped piece 3 slightly convex, in which case the tightening jaw rotates to some extent and the positional relationship with respect to the part to be machined is improved.

In the application example of FIG. 12, the inner side of the clamping jaws 2 is provided with a V-shaped groove, so that both jaws 2 are guided by the inclined sides of the wedge-shaped piece 3.

[Brief explanation of drawings]

Fig. 1 is a side view showing an embodiment of the tightening clamp according to the present invention in the initial position, Fig. 2 is a plan view of the clamp shown in Fig. 1, and Fig. 3 is a side view of the clamp shown in Fig. 1 in the tightened state. , FIG. 4 is a plan view of the clamp shown in FIG. 3, FIG. 5 is a side view of the tightening surface of the tightening clamp according to the present invention in a used state, and FIG. 6 shows the tightening clamp according to the present invention in various forms. A plan view of the device used, FIG. 7 is a plan view of another mode of use of the tightening clamp according to the present invention, FIG. 8 is a side view of the embodiment of FIG. 7, and FIG. 9 is a tightening clamp according to the present invention. 10 is a side view of the embodiment of FIG. 9, FIG. 11 is a sectional view of the second embodiment of the tightening clamp according to the present invention, and FIG. 12 is a side view of the embodiment of the present invention. FIG. 12A and FIG. 12B are side views of the embodiment, and FIG. 12C is a plan view of the embodiment. 1... Hole, 2, 6... Tightening jaw, 3, 4... Wedge-shaped piece.

Claims (1)

[Claims] 1. One wedge-shaped piece 3 with a cut-out tip or two wedge-shaped pieces 3 and 4 with cut-out tips and arranged symmetrically with their tips facing each other, and The tightening jaws 2 and 6 are in close contact with the inclined side surfaces, and the slope of the edge of the tightening jaws matches the slope of the side surface of the wedge-shaped piece, and the wedge-shaped piece has a hole 1 for the tightening member 7. and is moved in a direction perpendicular to the end face by the clamping member, and the clamping clamp is configured to clamp a machined part between the clamping jaw and the opposite surface 9 by the movement, The wedge-shaped pieces 3, 4 have at least two inclined side surfaces, and at least two fastening jaws 2, 6 are in close contact with the inclined sides, and two or more fastening jaws 2, 6 are provided on different sides of the wedge-shaped pieces. A tightening clamp for tightening machining parts, characterized in that it is designed to tighten machining parts. 2. Two wedge-shaped pieces 3 and 4 are provided, and both of the wedge-shaped pieces 3 and 4 are fixed to the installation base 8 by the tightening member 7.
The tightening clamp according to claim 1, which is adapted to be pushed toward. 3 The diameter of the hole 1 of the wedge-shaped pieces 3 and 4 is the same as the tightening member 7.
The tightening clamp according to claim 1 or 2, which is larger in diameter than the diameter of the clamp. 4. The tightening clamp according to any one of claims 1 to 3, which is provided with a spring 5 for returning the tightening jaw 2. 5. The tightening clamp according to any one of claims 1 to 4, wherein the wedge-shaped pieces 3 and 4 are mounted on the installation base 8 directly or via a member in the axial direction. 6. The tightening clamp according to any one of claims 1 to 5, wherein the tightening member is a screw 7 or a spindle driven by a pressure cylinder, an eccentric cam, or the like. 7 Comprising two wedge-shaped pieces 3 and 4, the tightening jaw 2 has two inclined surfaces, and the inclination of the inclined surfaces corresponds to the inclined surfaces of the wedge-shaped pieces 3 and 4, and the tightening jaw 2 has two inclined surfaces. 7. A tightening clamp according to any one of claims 1 to 6, wherein the bend between the inclined surfaces is arranged between the wedge-shaped pieces. 8. Claim 1 or 3, wherein the tightening jaw 6 includes one wedge-shaped piece 3 and has one sloped surface, and the slope of the slope corresponds to the slope of the wedge-shaped piece 3. , the tightening clamp according to any one of Items 5 and 6. 9. The tightening clamp according to claim 8, wherein the wedge-shaped piece 3 is pressed toward the installation base 8 by the tightening member 7. 10 The inclined inner surfaces of the tightening jaws 2, 6 are provided with guide grooves or V-shaped groove bottoms, and each jaw is provided with a wedge-shaped piece 3,
A tightening clamp according to any one of claims 1 to 9, wherein the clamp is guided by two surfaces. 11. The tightening clamp according to any one of claims 1 to 9, wherein the inclined surfaces of the wedge-shaped pieces 3, 4 are convex in the sliding direction.