CN209793185U

CN209793185U - Macro/Mini conversion clamp

Info

Publication number: CN209793185U
Application number: CN201920650510.1U
Authority: CN
Inventors: 羊非; 赵颖; 谢英
Original assignee: Zhuzhou Cemented Carbide Group Co Ltd
Current assignee: Zhuzhou Cemented Carbide Group Co Ltd
Priority date: 2019-05-08
Filing date: 2019-05-08
Publication date: 2019-12-17
Anticipated expiration: 2029-05-08

Abstract

The utility model discloses a Macro/Mini conversion clamp, including the anchor clamps head and connect the conversion piece of fastening in anchor clamps head one end, the anchor clamps head is composite construction, including the outer cover body of axial centre bore and the pipe box of being fixed in the axial centre bore, the material of pipe box is wear-resisting and the hardness is greater than the hardness of pole and outer cover body, the pole is installed in the smooth hole of pipe box with micron order clearance, the conversion piece is connected the fastening with standard Macro spacer; mechanical external force is applied to the outer sleeve body and is transmitted to the pipe sleeve to enable the pipe sleeve to generate micron-sized deformation to clamp the round bar, when the clamp is switched to be applied, the clamping stability is good, the clamping inner hole is wear-resistant, the high-precision machining requirement can be met, and the machined die part is guaranteed to be high in precision. The clamping inner hole is wear-resistant, so the updating rate of the conversion clamp is low, the maintenance cost is low, and the production cost is reduced.

Description

Macro/Mini conversion clamp

Technical Field

The utility model relates to a general high accuracy anchor clamps of machining tool specifically are a Macro Mini conversion anchor clamps.

Background

The process of processing a cemented carbide powder mixture into a compact of a certain shape and size and a certain density and strength is called forming. Different forming methods require different types of presses and dies. With the continuous development of the hard alloy industry in the high, precise and sharp directions, the precision required by a die for forming a pressed compact is higher and higher, especially in the aspects of geometric shape, fit clearance, parallelism, perpendicularity, concentricity and the like. How to manufacture a good die requires strict control of the die manufacturing and production process, and the most important thing for a high-precision machine tool is to match a precision clamp except for the responsibility of workers. The jig is a device for fixing a processing object to a correct position for receiving construction or inspection in a machine manufacturing process, and in a broad sense, a device for quickly, conveniently and safely mounting a workpiece in any process is called a jig.

For a long time, in the precision mold machining industry, the clamping and positioning fixture is generally a universal high-precision fixture for machine tools manufactured by SYSTEM3R company in sweden, and comprises a spark machine, a slow-moving wire, a machining center, a numerical control lathe, a grinding machine and the like, and the repeated positioning precision is below 0.002 mm. In swedish SYSTEM3R positioning clamps, there are two series of clamps, Macro and Mini. In order to fully exert the productivity, the machine tool of Macro series or Mini series can be used in practical production. At this time, a Macro/Mini3R conversion clamp is needed, which is commercially available from SYSTEM3R company in sweden, adopts the principle that an inner bore oil pressure thin spring ring deforms and clamps a 3R rod, and has a structure shown in fig. 7, needs to be matched with complex hydraulic equipment, is complex to operate and has high input cost. Due to the fact that production is accumulated day by day, the standard 3R rod needs to be frequently clamped and disassembled in a Swedish SYSTEM Macro/Mini3R conversion clamp, an inner hole of the conversion clamp is abraded, precision is reduced, the high-precision processing requirement cannot be met, the updating rate is high, maintenance cost is high, and production cost is greatly increased.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an assembly stability is good, the difficult wearing and tearing of centre gripping position, can satisfy high accuracy processing requirement, and need not supporting complicated force applying equipment and can change the Macro/Mini conversion anchor clamps that centre gripping hole aperture pressed from both sides tight pole.

The utility model provides a Macro/Mini conversion clamp for clamping round bar, including clamp head and conversion piece fastened on one end of the clamp head, the clamp head is composite structure, including the outer sleeve body of axial centre hole and the pipe sleeve fixed in the axial centre hole, the material of the pipe sleeve is wear-resistant and the hardness is greater than the hardness of the round bar and the outer sleeve body, the round bar is installed in the smooth inner hole of the pipe sleeve with micron order clearance, the conversion piece is connected and fastened with the standard Macro positioning piece; mechanical external force is applied to the outer sleeve body and transmitted to the pipe sleeve, so that the pipe sleeve generates micron-sized deformation to clamp the standard round rod.

In one embodiment of the above technical solution, the pipe sleeve is made of tungsten steel, the wall thickness of the pipe sleeve is δ, δ is greater than or equal to 1.5mm and less than or equal to 2.0mm, the diameter of the inner hole is Φ d, the tolerance is 0-0.005 mm, and the surface roughness Ra of the inner hole is less than or equal to 0.1; the outer sleeve body is a T-shaped round bar made of carbon steel, and the aperture of an axial center hole of the outer sleeve body is 0.02-0.03 mm smaller than the outer diameter of the pipe sleeve.

In an embodiment of the above technical solution, the outer sleeve is heated and then assembled with the pipe sleeve, so that the outer wall of the pipe sleeve is tightly attached to the hole wall of the axial central hole of the outer sleeve after assembly.

Furthermore, after the outer sleeve body and the pipe sleeve are hot-assembled to form an integral piece, a plurality of radial grooves and axial grooves are processed on the same side of the outer wall of the outer sleeve body, the central angle of each radial groove is larger than 170 degrees and smaller than 180 degrees, the radial grooves and the axial grooves are arranged in an I shape, entities on two sides of each axial groove are provided with communicated horizontal threaded holes, fastening bolts are matched in the horizontal threaded holes, and the clamping force of the fastening bolts is transmitted to the pipe sleeve to enable the pipe sleeve to deform in a micron-sized mode.

In an embodiment of the above technical scheme, an outer diameter of the conversion plate is consistent with an outer diameter of a step surface of the outer sleeve, a circle of round hole is formed in the step surface of the outer sleeve, a circle of corresponding threaded hole is formed in the conversion plate, and the conversion plate and the round hole are connected through a fastening screw.

In one embodiment of the above technical scheme, the conversion plate and the standard Macro positioning plate are connected through a circle of fastening screws, and the aperture of a screw mounting hole on the standard Macro positioning plate is larger than the aperture of a threaded hole on the conversion plate.

This conversion anchor clamps make the centre gripping hole of anchor clamps produce the multistage micro-deformation along the axial through mechanical external force, realize the clamp of pole promptly through the multistage centre gripping tightly, need not to dispose the complicated application of force executive equipment of prior art, can implement through manual operation moment spanner class instrument, and the input cost is low, easy operation. The clamp head is of a composite structure, the pipe sleeve of the clamping round rod is made of wear-resistant materials with hardness larger than that of the round rod and the outer sleeve, the outer diameter of the outer wall of the outer sleeve of the clamp head is reduced to transmit clamping force to the pipe sleeve, the clamping stability is good, and the clamping inner hole is wear-resistant, so that the high-precision machining requirement can be met, and the machined mould part is guaranteed to be higher in precision. The clamping inner hole is wear-resistant, so the updating rate of the conversion clamp is low, the maintenance cost is low, and the production cost is reduced.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention.

Fig. 2 is a schematic structural view of the chuck head in fig. 1.

Fig. 3 is a schematic right-side view (including partial cutaway) of fig. 2.

Fig. 4 is a left side view of fig. 2.

Fig. 5 is a schematic top view of fig. 2.

fig. 6 is a schematic structural diagram of the converter plate in fig. 1.

Fig. 7 is a schematic structural diagram of the prior art.

Detailed Description

The Macro/Mini conversion fixture disclosed in this embodiment is used to clamp a standard 3R rod, the standard 3R rod having a diameter of 20 mm.

As shown in fig. 1, the present conversion jig includes a jig head 1, a conversion plate 2, and a standard Macro positioning plate 3. As can be seen in connection with fig. 1 to 5, the gripper head 1 comprises an outer casing 11 and a pipe sleeve 12.

The pipe sleeve 12 of the embodiment is a circular pipe made of tungsten steel, the wall thickness is 2mm, the inner hole 12-1 is a smooth hole, the surface roughness requirement at least reaches Ra0.1, and the diameter of the inner hole is phi 20₀ ^+0.005mm。

The outer sleeve 11 of this embodiment is a T-shaped round bar made of ordinary carbon steel, and the aperture of the axial center hole is about 0.025mm smaller than the outer diameter of the sleeve 12.

After the outer sleeve 11 is heated, the pipe sleeve 12 is hot-fitted into the axial center hole, and after the outer sleeve 11 is cooled, the outer wall of the pipe sleeve 12 can be tightly attached to the inner wall of the outer sleeve 11.

The tungsten steel material has high hardness and good wear resistance, and can adapt to repeated clamping and disassembly of a standard 3R rod.

After the outer sleeve body 11 and the pipe sleeve 12 are hot-assembled to form an integral piece, a plurality of radial grooves 1-1 and axial grooves 1-2 are machined on the same side of the outer wall of the outer sleeve body 11, the central angle of each radial groove 1-1 is 178 degrees, and the radial grooves 1-1 and the axial grooves 1-2 are arranged in an I shape.

As can be seen in conjunction with fig. 1 to 4: the radial slots 1-1 of this embodiment are four in number, with the uppermost and lowermost ones being spaced from the top and bottom surfaces of the chuck head, respectively. From top to bottom, a first axial groove 1-2 is processed at the middle position of the arc length of the first radial groove and the arc length of the second radial groove, and a second axial groove 1-2 is processed between the third radial groove and the fourth radial groove, so that two I-shaped grooves are formed, and two clamping sections can be formed.

The entity of two sides of two axial grooves 1-2 has horizontal screwed hole 1-3 that link up separately, is supporting in the horizontal screwed hole has horizontal fastening bolt 4, the clamp force of horizontal fastening bolt 4 transmits to pipe box 12, make pipe box 12 produce the micron order and deform.

A circle of round holes 1-4 are processed on the step surface of the clamp head 1 and used for connecting the conversion sheet 2. As can be seen from FIG. 5, a plurality of circular holes 1-4 are uniformly distributed in one circle. The outer diameter of the conversion plate 2 is the same as the diameter of the step surface of the clamp head 1, and a circle of threaded holes 2-1 corresponding to the step surface are formed in the conversion plate, as shown in fig. 6.

The fastening screw LD passes through the round hole 1-4 of the step surface of the clamp head 1 and then is screwed into the threaded hole 2-1 on the conversion sheet, so that the bottom surface of the step surface of the clamp head is tightly attached to the top surface of the conversion sheet 2.

This conversion anchor clamps realizes the switching through conversion piece 2, connects the fastening through fastening screw LD between conversion piece 2 and the standard Macro spacer 3. I.e. the conversion plate 2 functions as a receiving fixture head 1 and a standard Macro positioning plate 3.

The circle of the threaded holes 2-2 matched with the fastening screw mounting holes on the standard Macro positioning plate 3 is arranged on the conversion plate 2, as can be seen from figure 6, the circle of the threaded holes is positioned at the radius smaller than the radius of the circle of the fastening screw mounting holes on the conversion plate 2 and the clamp head 1, 4 threaded holes are uniformly distributed on the circle, as can be seen from figure 1, the aperture of the small circle of the threaded holes on the conversion plate 2 is smaller than the aperture of the fastening screw mounting holes on the standard Macro positioning plate 3, and therefore the assembling precision of the Macro/Mini conversion clamp in the assembling link can be improved by continuously adjusting the tightness and the position of the fastening screws LD. The fastening screw LD passes through the screw mounting hole on the standard Macro positioning plate 3 and then is screwed into the threaded hole 2-2 on the conversion plate 2, so that the conversion plate 2 is tightly attached to the standard Macro positioning plate 3.

When the standard 3R rod is installed on the conversion clamp, the standard 3R rod is inserted into an inner hole 12-1 of a pipe sleeve 12 of a clamp head 1, the lower end of the standard 3R rod is limited through a conversion sheet 2, calculated force is applied through a torque wrench respectively, and a horizontal fastening bolt 4 is rotated to tighten the entity on two sides of an axial groove 1-2, so that the force is transmitted to the pipe sleeve 12 until the pipe sleeve 12 reaches a preset micro-deformation (generally-0.007 mm), the standard 3R rod is clamped tightly, the operation is simple and reliable, a complex force application execution system is not required to be equipped, and the input cost is low.

The standard 3R rod provides a larger clamping force through a plurality of upper and lower horizontal fastening bolts 3, and can meet the requirement of reaching a preset deformation amount; in addition, the upper horizontal fastening bolt 3 and the lower horizontal fastening bolt 3 can position the standard round rod twice, so that the positioning straightness can be improved, the axis of the standard round rod is not easy to incline and deform in the machining process, and the machined die part is ensured to have higher precision.

When the round bar is replaced, the standard 3R round bar can be pulled out by loosening the horizontal fastening bolt, and the round bar is convenient and fast.

The utility model discloses still can be applied to the clamp of other diameter standard pole tightly.

When the diameter of the standard round bar is phi 20-phi 30mm, two I-shaped radial grooves and two I-shaped axial grooves are arranged on the outer sleeve body according to the embodiment to form two clamping sections.

When the diameter of the standard round rod is phi 30-phi 40, six radial grooves and 3 axial grooves can be arranged according to the embodiment, namely three I-shaped clamping sections are formed, so that a larger clamping force is provided, and the clamping effect is ensured.

When the diameter of the standard round rod is not more than phi 20 or not less than phi 40, the radial grooves and the axial grooves are reduced or increased according to specific conditions so as to meet the set micron-scale deformation.

To sum up, the utility model discloses following advantage has:

1. Simple structure, cost of manufacture are low, combination joint strength is high, be convenient for equipment adjustment and dismantlement, satisfy precision operation requirement and economical and practical.

2. The pipe sleeve is made of tungsten steel (hard alloy), the hardness of the pipe sleeve is higher than that of a standard round rod, the requirement of frequent use of machining is met, the clamping inner hole is not easy to wear and deform, the machined die part is guaranteed to be higher in precision, the updating rate of the clamp head is reduced, the maintenance cost is reduced, and therefore the production cost is reduced.

3. The standard round bar is clamped by screwing the horizontal fastening bolt to slightly deform the pipe sleeve. In the working procedures of electric machining, numerical control turning/milling/grinding and the like, the coaxiality of the axis center of the circular hole of the clamp and the axis center of the Marco clamp is less than 0.003mm, so that the quick clamping of the part to be machined can be realized, and the assembly precision and the machining quality can be improved.

Claims

1. The utility model provides a Macro/Mini conversion anchor clamps which characterized in that: the clamp comprises a clamp head and a conversion sheet which is connected and fastened at one end of the clamp head, wherein the clamp head is of a composite structure and comprises an outer sleeve body with an axial center hole and a pipe sleeve fixed in the axial center hole, the pipe sleeve is made of wear-resistant materials, the hardness of the pipe sleeve is greater than that of a round rod and the outer sleeve body, the round rod is arranged in a smooth inner hole of the pipe sleeve in a micron-sized clearance mode, and the conversion sheet is connected and fastened with a standard Macro positioning sheet; mechanical external force is applied to the outer sleeve body and transmitted to the pipe sleeve, so that the pipe sleeve generates micron-sized deformation to clamp the round rod.

2. The converting jig of claim 1, wherein: the pipe sleeve is made of tungsten steel, the wall thickness of the pipe sleeve is delta, delta is more than or equal to 1.5mm and less than or equal to 2.0mm, the diameter of an inner hole is phi d, the tolerance is 0-0.005 mm, and the surface roughness Ra of the inner hole is less than or equal to 0.1; the outer sleeve body is a T-shaped round bar made of carbon steel, and the aperture of an axial center hole of the outer sleeve body is 0.02-0.03 mm smaller than the outer diameter of the pipe sleeve.

3. The converting jig of claim 2, wherein: and heating the outer sleeve body and assembling the outer sleeve body with the pipe sleeve so that the outer wall of the assembled pipe sleeve is tightly attached to the hole wall of the axial central hole of the outer sleeve body.

4. The converting jig of claim 3, wherein: after the outer sleeve body and the pipe sleeve are hot-assembled to form an integral piece, a plurality of radial grooves and axial grooves are processed on the same side of the outer wall of the outer sleeve body, the central angle of each radial groove is larger than 170 degrees and smaller than 180 degrees, the radial grooves and the axial grooves are arranged in an I shape, entities on two sides of each axial groove are provided with communicated horizontal threaded holes, fastening bolts are matched in the horizontal threaded holes, and the clamping force of the fastening bolts is transmitted to the pipe sleeve to enable the pipe sleeve to deform in a micron-scale mode.

5. The converting jig of claim 2, wherein: the outer diameter of the conversion piece is consistent with the outer diameter of the step surface of the outer sleeve body, a circle of round hole is formed in the step surface of the outer sleeve body, a circle of corresponding threaded hole is formed in the conversion piece, and the conversion piece and the round hole are connected through a fastening screw.

6. The converting jig of claim 5, wherein: the conversion plate is connected with the standard Macro positioning plate through a circle of fastening screws, and the aperture of a screw mounting hole in the standard Macro positioning plate is larger than that of a threaded hole in the conversion plate.