CN2114526U - Circumference shaft hole fixing soft claw - Google Patents

Abstract

The utility model relates to a circumference shaft hole fixing soft claw which is an improvement of a lathe three-claw chuck. The utility model is used for the positioning and clamping of thin-wall workpieces, irregular workpieces and workpieces with lower surface hardness. The circumference shaft hole fixing soft claw is mainly composed of a circular base 1 and three groups of fastening feet. Each of the three groups of fastening feet generally comprises a rigid base, a soft surface seat and fastening bolts. A locating bearing, a locating chassis and fastening bolts are added on the group of fastening feet with special structure. The utility model utilizes a high-precision shaft hole for positioning. The soft surface seat of the utility model which forms a round stage shape can rotate in a locating bearing hole. The periphery of the soft surface seat can be processed to position and clamp workpieces. Therefore, the circumference shaft hole fixing soft claw has the advantages of wide application, multipurpose claw, labour and material saving and high precision. The utility model especially satisfies the positioning and clamping of eccentricity processed workpieces. The preparing process is simplified.

Description

Circumference shaft hole fixing soft claw

The utility model is a kind of metal cutting processing and loading clamp tool that uses on lathe, configurable in the lathe scroll chuck of all size, in order to the workpiece of positioning and clamping and processing different shape.

Generally all adopt scroll chuck clamping processing work on the lathe; its card base hardness is higher usually; also less with the contact-making surface of workpiece; so; when the irregularly shaped workpiece of processing; regular meeting take place can't clamping situation, when the lower workpiece of processing thin-walled workpiece or case hardness, easily cause workpiece deformation or surface indentation again.In order to address this problem, traditionally at the lower metal material of the topped last layer hardness in hard card pin surface to constitute the soft claw of clamping.One of concrete grammar is that copper billet with rectangle is with screw or be welded on the card base surface, two of concrete grammar is that the lower metallic sheath of hardness that preprocessing is shaped is on the hard card pin, tighten fixing from the side with screw again, three of concrete grammar is that the hard card pin is divided into pedestal and face seat two parts, both are identical rectangle, use screw fastening again after being connected with cross key, the face seat is divided into soft, hard two kinds, just changes soft seat when processing irregularly shaped workpiece, thin-wall workpiece etc.Above-mentioned several method and specific clamping tool thereof are all exchanged one by one with processed workpiece, and the shape of conversion processing work or size must be changed the clamping tool thereupon, and are difficult to satisfy the clamping workpiece needs that eccentricity adds man-hour.These clamping tools use object single, the processing and fabricating trouble, and consume material is many, the cost height, positioning accuracy is low, and processing effect is poor, and operation is difficult for, and revises inconvenience, and adaptability is not good enough, influences it and applies.

The purpose of this utility model just provides the soft claw of lathe that a kind of high-precision pawl that can overcome the periphery axis hole location, garden of above-mentioned weakness is used more, this soft claw has soft seat of garden platform shape, it utilizes central shaft hole location and rotation, but the garden periphery full use of soft seat is strong with the workpiece adaptability of rotating clamping difformity and size, wide application, the machining accuracy height, cost is low, can satisfy the needs of workpiece eccentricity processing simultaneously.

The utility model is to realize like this.Referring to Fig. 1, Fig. 2, Fig. 1 is overall structure signal of the present utility model, and Fig. 2 is that the structure of single group card base is dissected signal.As shown in the figure, the utility model is made up of general lathe scroll chuck base 1 and three groups of card bases, and every group of card base comprises hard pedestal 2, soft seat 3 and trip bolt 4 each.With traditional lathe scroll chuck structure roughly the same, base 1 upper surface in garden is processed with planar disk to recessed screw thread, hard pedestal 2 bottoms of strip are provided with the plane convex thread and match to recessed screw thread with garden base 1 planar disk, can engagement just, three hard pedestals 2 radially be connected on the garden base 1, as shown in Figure 1 so that being garden week trisection.Special feature is: hard pedestal 2 fronts are processed with the individual screw of imbedding of n that a line is distributed in band locating hole radially.But hard pedestal 2 is new system both, also can utilize the hard card pin transformation of the way of traditional scroll chuck, earlier with hard card pin differential annealing or integrally annealed, longitudinally evenly distributes in its front subsequently and processes the flush type screw of several band locating holes during the transformation of the way.Soft seat 3 adopts the metal material or the nonmetallic materials of copper or other softs to make, shown in Fig. 2 (b), profile is garden platform shape, the bottom has the locating shaft microgap that cooperates with locating hole microgap hard pedestal 2 protrusion generally in 0.01 millimeter, garden platform height is looked processing needs decision, and platform center, garden is processed with the tapped through hole in the heavy hole of band so that trip bolt 4 to be installed.Hexagonal standard screws in trip bolt 4 adopts.Three all visual processing specific requirements of soft seat 3 are separately fixed at the imbedding in the screw of any combination of three hard pedestals 2 with three trip bolts 4, the locating shaft of an at this moment soft seat 3 inserts in the locating hole of corresponding hard pedestal 2 with the location.Utilize the rotation of locating shaft in locating hole can make 3 rotations of soft seat, therefore the whole garden periphery of soft seat 3 can be used for processing the garden segmental arc of holding workpiece, like this, after loading onto a secondary soft claw on the scroll chuck, can be processed into some sub-folders and hold the clamping tool of different workpieces, the many usefulness of one pawl, Fig. 2 (b) illustrates soft seat 3 that a pawl is used more.

A kind of distortion special construction of the present utility model is that fan-shaped garden periphery axis hole is located soft claw, and its monodactyle cross-section structure signal is referring to Fig. 3.The clamping of its suitable large-scale workpiece and special-shaped workpiece.This soft claw is made up of garden base 1 and three groups of card bases, every group of card base is by hard pedestal 2, location axle sleeve 5, chassis 6, location, chassis, location trip bolt 7, soft seat 3, soft seat trip bolt 4 formed, the structure of its garden base 1, hard pedestal 2, soft seat 3, soft seat trip bolt 4 is identical with the part of the same name that aforementioned general garden periphery axis hole is located soft claw, and one end of location axle sleeve 5 cooperates with locating hole microgap on the pedestal 2 firmly during installation.Chassis 6, location is as Fig. 4, be 120 ° fan-shaped, its front processes the through hole that supplies to install location axle sleeve 5 that is distributed with n the heavy hole of band on 1/2nd garden heart angular bisectors, can design and process many tapped through holes that supply to install the band positioning shaft hole that shifts soft seat 3 that scatter on covering of the fan as required.During use, according to the processing needs, utilize soft seat dog screw 4 that soft stand-by seat 3 distinguished positioning and fixing on the appropriate location tapped through hole on chassis 6, location, location axle sleeve 5 is mounted to one with chassis 6, location, with chassis, location trip bolt 7 location, chassis, three fan-shaped location 6 is fixed on three hard pedestals 2, three hard pedestals 3 are garden week trisection and radially are connected on the garden base 1.Hexagonal standard screws in chassis, location trip bolt 7 adopts should be eliminated relevant fit clearance earlier when using the utility model, and cooperates serial high-precision folder to hold in both hands and tensioner ring, to guarantee clamping and machining accuracy.

The utility model is compared with traditional soft claw, and adaptability is strong, wide application, and the machining accuracy height, cost is low, and the many usefulness of energy one pawl can satisfy the clamping workpiece needs that eccentricity adds man-hour, and tool has an enormous advantage and positive effect.Particularly, following advantage being arranged: 1. can rotate owing to soft seat 3, but its garden periphery full use, so the many usefulness of energy one pawl are saved material, the man-hour of making and special fixture being installed, reduction anchor clamps cost is enhanced productivity.2. because soft seat 3 be garden shape, all clamping is processed and all can be finished by lathe self, has reduced soft claw manufacturing procedure and man-hour, saves time, laborsaving, material-saving.3. utilize the radius or the diameter of soft seat 3 of garden shape, simplified the calculating and the measurement of clamping, processing work, can measure the shape and the positional precision of general workpiece by clamping precision of the present utility model.4. can satisfy the clamping needs of eccentricity processing work easily, for the processing of workpiece such as bent axle provides assurance.5. utilize the fan type garden periphery axis hole of the utility model modification to locate soft claw, can satisfy the clamping requirement of large-scale and special-shaped workpiece processing, make the big workpiece of less machine tooling.6. the utility model can change traditional " cutter falls " processing technology, takes the new process for processing of " thick earlier back is smart, shunting processing ", improves qualification rate, interchangeability and the work efficiency of workpiece.The utility model also can be applied on other lathes such as milling machine.

Use-case of the present utility model is as follows,

Example one. the outer garden of clamping workpiece, referring to Fig. 4,

Known: diameter of work is φ ₁, soft claw diameter is φ ₂

The extremely hard pedestal card base edge clipping distance C of the soft claw locating shaft garden heart,

Service routine:

1. according to the rigidity of workpiece to be processed, the vertical diameter of setting soft seat 3 clamping workpiece garden segmental arcs is to turning amount h, h generally diameter of work φ 1/3 to 1/10 in value, good rigidly h value is got littler, poor rigidity h value is got greatly.

2, after the setting h value, can complying with down, routine formula calculates folder handful diameter

φ ₃＝φ ₂＋φ ₁－2（C＋h）

Hard pedestal card base clamping with soft claw lives in φ ₃After the high accuracy folder of diameter was held in both hands, soft seat 3 of turning was processed into clamping φ ₁The garden segmental arc of workpiece.

3. utilize one of following formula to measure clamping precision:

B ₁＝C＋ (φ ₃-φ ₁)/2

B＝C＋ (φ ₃+φ ₂+φ ₁)/2

In the formula: B ₁--after soft seat 3 processed the garden segmental arc, its locating shaft garden heart was to the distance of workpiece external diameter

B ₂--after soft seat 3 processes the garden segmental arc, the distance from garden segmental arc intersection point to soft seat 3 external diameter intersection points on the workpiece garden heart and soft the seat 3 garden heart line.

4. be folded down folder and hold in both hands clamping φ ₁The workpiece processing of diameter.

Example 2: outer garden workpiece eccentric throw processing and loading clamp, referring to Fig. 6,

Known: diameter of work φ ₁Be 33 millimeters, soft claw diameter is 50 millimeters, and eccentric distance X is 12 millimeters, and the soft claw locating shaft garden heart to hard pedestal card base edge distance C is 15.2 millimeters,

As example 11,2,3, step,

(1) establishes h=φ ₁3 millimeters of/10=3.3 ≈

(2) try to achieve folder and hold in both hands diameter phi ₃

φ ₃=50+33=2(15.2+3)=46.6 millimeter

(3) the big folder of high accuracy of living in φ 46.6 with hard pedestal card base clamping is held in both hands, and soft seat 3 of turning is processed into the clamping location benchmark that the clamping diameter is 33 millimeters a workpiece, i.e. shape after thin soft seat of straight line 3 processing among Fig. 6.

(4), try to achieve B according to formula

B ₂=15.2+(46.6+50-33)/the 2=47 millimeter

Cooperate the fit clearance that requires workpiece and clamping location benchmark in 0.01 millimeter with workpiece with in-process measurement B for feeler gauge simultaneously, write down the radially scale and the depth location of cutter and locate with the backer this moment.

2. take off φ ₃Folder is held in both hands, and takes off two soft seats 3, refills with the card base of hard pedestal 2 and clamps eccentric throw processed clip handful φ ₄, the 3rd soft seat 3 that processing is remaining makes the radially scale of cutter and depth location to the scale of writing down originally, i.e. the double dot dash line position of the 3rd soft seat 3 among Fig. 6.

φ ₄Calculate according to following formula

${\mathrm{\Φ}}_4={\mathrm{\Φ}}_3-3x+\sqrt{4{(\frac{{\mathrm{\Φ}}_1}{2}+C)}^2-{3x}^2}-{\mathrm{\Φ}}_1-2C$

In this example:

At this moment, according to the fraction in the example one, ask B at this moment ₂

B ₂=15.2+(7.10+50-33)/the 2=27.25 millimeter

The radially scale and the degree of depth backer of in-process measurement and cutter are used.

3. take off φ ₄Clip is held in both hands, and loads onto former two soft seats 3 in addition that take off, and refills φ to be processed ₁Workpiece is taken advantage of a situation the garden segmental arc of two soft seats 3 loading onto again and is forwarded to and φ ₁After coincideing, the outer garden of workpiece promptly uses trip bolt 4 positioning and fixing, i.e. position shown in the dotted line among Fig. 6.Clamping φ according to this ₁12 millimeters processing to it after workpiece finishes as eccentric throw.

Claims (2)

1, a kind of lathe scroll chuck that soft claw is arranged, form by base (1) and three groups of card bases, every group of card base is made of hard pedestal (2) and soft seat (3), it is characterized in that hard pedestal (2) front is processed with the screw of imbedding that a line is distributed in radially n band locating hole; Soft seat (3) adopts metal material, the nonmetallic materials of copper or other softs to make, profile is garden platform shape, the bottom has the locating shaft that the locating hole microgap with on the hard pedestal (2) of protrusion cooperates, platform center, garden is processed with the tapped through hole in the heavy hole of band, so that trip bolt (4) to be installed soft seat (3) axle is positioned on the hard pedestal (2).

2, lathe scroll chuck according to claim 1, it is characterized in that being provided with and be chassis (6), 120 fan-shaped three location, chassis, location (6) is distributed with many tapped through holes for the band locating hole that soft seat (3) is installed along being distributed with n on the angular bisector of heart angle, 1/2nd gardens for the heavy hole of the band that location axle sleeve (5) is installed through hole on other positions; Chassis, location (6) is fixed on the hard pedestal (2) by location axle sleeve (5) and location chassis trip bolt (7).

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