CN214079655U - Clamping jig suitable for electric spark machining of precise small parts - Google Patents

Abstract

The utility model discloses a clamping jig suitable for the electric spark processing of precise small parts, which comprises a quick positioning unit, a locking unit, a clamping module and a locking adjusting block which are arranged on the electromagnetic working table surface of an electric spark machine tool; clamping the machined part on the clamping module through the locking adjusting block and the locking unit; the clamping module is arranged on the quick positioning unit. The utility model discloses simple structure, design are ingenious, the practicality is strong, can effectual improvement electric spark machine tool's effective utilization ratio, and then realize the promotion of machining efficiency and the reduction of processing cost.

Description

Clamping jig suitable for electric spark machining of precise small parts

Technical Field

The utility model belongs to the technical field of frock tool, concretely relates to clamping tool suitable for accurate small-size part spark-erosion machining.

Background

The electric spark machining process of the precise small-sized part has two remarkable process characteristics, so that the effective discharge time and the starting time of a machine tool are generally lower, and the two characteristics are as follows:

1. the clamping of part on work platform lacks the frock tool that the commonality is high with setting for. At present, the clamping setting mode of the electric spark process machining is generally set in a mode of arranging a simple jacking block on a working table and matching with glue, and the setting efficiency is low.

2. The electric discharge machining is non-cutting machining by electric discharge corrosion, and a high-precision part usually needs to be successfully machined through multiple times of trial machining, so that multiple clamping settings are needed for finishing the machining of one part.

The precision small parts are parts with the overall dimension less than 30X30 mm and the height of 30-50 mm, and the parts have high proportion in the cavity insert of the precision mould, usually about 60-80% of a set of cavity parts; the ratio of the effective discharge time (the time for actually carrying out discharge corrosion on the part) of the industrial electric spark process to the starting-up time is only about 50%, and the improvement and promotion space is large. On one hand, clamping is set frequently, and on the other hand, a special clamping jig is lacked, so that the effective utilization rate of the machine tool is low.

Currently, there are two main categories of industry technologies for solving such problems: one is that the machining size of the part can be measured without detaching the part from a machine tool in the process of machining the part by online detection equipment, so that the times of clamping and setting are reduced; one type is special clamping equipment provided by professional manufacturers. The main limitations of these two types of devices are two-fold: firstly, the two technologies are mainly suitable for medium-sized and large-sized parts due to the size of the detection probe and the fact that the detection probe can only be clamped and set by a single piece generally; firstly, the hardware input cost is high, and the later stage use maintenance cost is also high.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to the aforesaid among the prior art not enough, provide a clamping tool suitable for accurate small-size part spark-erosion machining to solve or improve foretell problem.

In order to achieve the purpose, the utility model adopts the technical proposal that:

a clamping jig suitable for electric spark machining of precise small parts comprises a quick positioning unit, a locking unit, a clamping module and a locking adjusting block, wherein the quick positioning unit, the locking unit, the clamping module and the locking adjusting block are arranged on an electromagnetic working table of an electric spark machine tool; clamping the machined part on the clamping module through the locking adjusting block and the locking unit; the clamping module is arranged on the quick positioning unit.

Furthermore, the quick positioning unit comprises a quick positioning plate, three groups of positioning keys are arranged on the quick positioning plate, and the positioning keys are fixed in positioning grooves formed in one-step machining on the quick positioning plate through locking screws.

Furthermore, the material of the quick positioning plate is a magnetizer material.

Furthermore, the locking unit is fixed on the clamping module base and comprises a positioning locking base, a locking block and a locking knob; the locking piece holding is equipped with the locking cam in the locking piece in location locking base, and the locking cam cover is located on the drive shaft to be connected with the locking knob through the drive shaft.

Furthermore, the locking block drives the locking cam to move forwards by 0-3.5mm through the locking knob, and the locking cam is used for rapidly locking the machined part.

Furthermore, the clamping module comprises a clamping module base, the solid part of the non-functional area at the bottom of the clamping module base is hollowed, and the hollowed opening is sealed.

Furthermore, 6 workpieces are clamped by one clamping module, and 3 clamping modules are installed on the quick positioning unit.

Furthermore, a locking adjusting block is fixed between the locking unit and the machining part, and the locking adjusting block and the locking unit are matched for fixedly clamping the machining part.

The utility model provides a clamping tool suitable for accurate small-size part spark-erosion machining has following beneficial effect:

the utility model discloses simple structure, design are ingenious, the practicality is strong, can effectual improvement electric spark machine tool's effective utilization ratio, and then realize the promotion of machining efficiency and the reduction of processing cost.

The utility model discloses have good commonality, through detecting its system precision and being less than or equal to 2um, repeated positioning accuracy is less than or equal to 1um, is fit for with the mold insert processing of accurate mould benevolence part 60-80%, consequently no matter be inside the enterprise, still all have good popularization and commercial value between the trade.

The method has the advantages that the mode that the internal setting is converted into the external setting, the one-time setting of a plurality of workpieces is realized, the repeated setting of the processing coordinate origin is eliminated, the setting auxiliary time of the workpieces is effectively shortened, the effective utilization rate of a machine tool is improved from 50% to 70% -80%, only the method can improve the production output by 20% -30%, and the method has good economic benefits for an electric spark machining workshop with a certain production scale.

By setting the plurality of jigs on the clamping module during machining preparation, the workpiece is not dismounted until machining detection is completed and the workpiece is judged to be qualified, so that the switching efficiency between machining equipment and detection equipment in the machining process is improved, the repeated setting progress is improved, the dependence of the setting work on the skill level of an operator is reduced, and the quality cost can be reduced by 5-10%.

Drawings

Fig. 1 is a general structure diagram of a clamping jig suitable for electric discharge machining of precise small parts.

Figure 2 is a front view of the clamping module.

Figure 3 is a reverse view of the clamping module.

Fig. 4 is a structural view of the locking unit.

Fig. 5 is a schematic diagram of the locking unit.

Fig. 6 is a diagram of a fast positioning unit.

Wherein, 1, the electromagnetic working table of the electric spark machine tool; 2. a fast positioning unit; 3. a locking unit; 4. clamping the module; 5. processing parts; 6. locking the adjusting block; 7. clamping a module base; 8. locking screws; 9. a lightweight structure; 10. positioning a locking base; 11. a locking block; 12. a locking knob; 13. a drive shaft; 14. a locking cam; 15. a spacing pin; 17. a quick positioning plate; 18. a positioning key; 19. and locking the screw.

Detailed Description

The following description of the embodiments of the present invention is provided to facilitate the understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and various changes may be made apparent to those skilled in the art within the spirit and scope of the present invention as defined and defined by the appended claims.

According to an embodiment of the application, referring to fig. 1, the clamping jig suitable for the electric spark machining of the precise small parts comprises a quick positioning unit 2, a locking unit 3, a clamping module 4 and a locking adjusting block 6 which are installed on an electromagnetic working table surface 1 of an electric spark machine tool.

The processing part 5 is clamped on the clamping module 4 through the locking adjusting block 6 and the locking unit 3; the clamping module 4 is arranged on the quick positioning unit 2.

Each of the above-described modules will be described in detail below.

And the clamping module 4 is used for quickly setting the parts on the machine tool, carrying out turnover and quick positioning in the process steps of trial machining, detection outside the machine and adjustment and repair, and not needing to dismount the workpiece, so that the purposes of saving setting time and improving the machining repeated positioning precision and the quality stability are achieved.

Referring to fig. 2, the clamping module 4 includes a clamping module base 7, and the clamping module 4 can set multiple identical or different small parts on the clamping fixture at one time, and then operate the parts as a whole in multiple settings performed in subsequent machining, and quickly position the parts in the machine tool coordinates and the coordinates of the external detection equipment, so that the required auxiliary time for single setting time and multiple steps can be greatly shortened.

Referring to fig. 3, a tapered positioning groove is formed in the clamping module base 7, and the groove is processed by ultra-high precision grinding, and the repeated positioning precision is less than or equal to 1 um; the locking unit 3 and the clamping module base are fixed together by the locking screw 8 to form the whole clamping module 4. For the convenience of operating personnel use the clamping tool, design clamping module 4, include: firstly, the light-weight structure 9 is used for fully hollowing out the solid part of the non-functional area of the clamping module base 7, so that the total amount of the whole clamping module 4 is only 50% of the total amount of the solid part, and the total amount of the clamping module is controlled within 0.75kg, and the clamping module is convenient to take; secondly, considering that the working environment of the clamping jig is in the electrolyte oil of electric spark machining, when the clamping jig is taken out, the oil needs to be quickly and cleanly removed, so that on one hand, the opening of the light weight structure 9 is designed in a closed mode, and on the other hand, all the functional grooves which leak outwards are designed in inclined planes, so that oil storage at dead corners is avoided, and the oil is difficult to clean.

Referring to fig. 4, the locking unit 3 is used for locking a part, and since the locking formation is designed to be 3.5mm, a matched locking adjusting block 6 needs to be reasonably selected during use so as to adapt to clamping of parts with different external dimensions.

The locking unit 3 is fixed on the clamping module base 7, and the locking unit 3 comprises a positioning locking base 10, a locking block 11 and a locking knob 12; the locking block 11 is accommodated in the positioning locking base 10, a locking cam 14 is arranged in the locking block 11, and the locking cam 14 is sleeved on the driving shaft 13 and is connected with the locking knob 12 through the driving shaft 13.

The locking unit 3 includes a positioning locking base 10, a locking block 11, a locking knob 12, a driving shaft 13, a locking cam 14, and a stopper pin 15. The locking unit 3 is fixed on the base through a positioning groove on the base of the locking module, and has a locking effect on the processing part 5 on one hand; on the one hand, the positioning reference is used for clamping the part in the X direction.

The positioning locking block is a positioning reference in the X direction and has the grinding precision less than or equal to 1 um. And meanwhile, rounding treatment is carried out on all sharp changes and sharp corners, so that operators are prevented from being scratched in the using process. The locking block 11 moves forwards by a distance of 0-3.5mm through a locking cam 14 driven by a locking knob 12, and is used for rapidly locking the part 5 to be machined.

Referring to fig. 5, the locking block is driven by a locking cam 14 fixed to a driving shaft 13 to move forward, locking the desired work piece 5. In order to place the locking block to drop, the limiting pin 15 is adopted to limit the locking block. The locking mechanism is driven by a cam, and does not adopt a thread locking or driving form commonly used by a self-made tool clamp, so that the factors of small cutting force of electric discharge machining and maximized operation efficiency are fully considered.

The quick positioning unit 2 is fixed on the working table of the machine tool at one time, is connected with the machine tool by special glue for bonding, does not need other auxiliary equipment, and can be detached at any time when necessary.

The quick positioning unit 2 comprises a quick positioning plate 17, three groups of positioning keys 18 are arranged on the quick positioning plate 17, and the positioning keys 18 are fixed in positioning grooves formed in one-step machining on the quick positioning plate 17 through locking screws 8.

Referring to fig. 6, the fast positioning unit 2 is fixed to the electromagnetic worktop of the electric discharge machine as a carrier for fast setting of the clamping module 4 into the machine coordinates.

The quick positioning plate 17 is made of a magnetizer material and can effectively transmit electromagnetism of the working table surface to quickly and tightly suck the clamping module 4. Three groups of positioning keys 18 are arranged on the quick positioning plate 17, 3 groups of positioning modules can be clamped simultaneously, and 6 stations are arranged on the module positioning modules, so that 18 parts can be clamped and positioned at most once. Each set of positioning keys 18 comprises 2Y-positions at both ends of the distribution and quick positioning plate 17 and 1X-position at the middle position. The local coordinates formed by each set of positioning keys 18 are associated with the global coordinates of the machine tool and are preset in the machining program, and the system can automatically read the coordinates of the machine tool as long as the station number used in the machining program is selected. The positioning key 18 is fixed in 9 positioning grooves which are formed in one step on the quick positioning plate 17 through locking screws 19, the positioning surfaces of the positioning keys have inclination, and the final high-precision grinding is carried out after the positioning keys are assembled on a quick fixing plate, so that the overall precision is less than or equal to 1 um.

The working principle of the scheme is as follows:

the quick positioning unit 2 is placed on the electromagnetic working table top 1 of the electric spark machine tool, then the quick positioning unit is corrected with the machine tool by using a dial indicator, and is firmly adhered to the electromagnetic table top of the electric spark machine tool by using special glue, and the quick positioning unit is not taken down in later use.

Next, the machined part 5 is clamped to the clamping module 4 by the locking adjustment block 6 and the locking unit 3. When the part is clamped, the machined part 5 is placed at a reference angle of the clamping module 4, then a proper adjusting locking block is selected to meet the requirement that the required locking stroke is less than or equal to 3mm, then the locking knob 12 of the locking unit 3 is rotated to preliminarily fix the part without locking, the part is corrected by using a dial indicator, and then the machined part 5 is clamped between the locking adjusting block 6 and the locking unit 3 by rotating the locking knob 12, namely the part is locked. The parts are clamped and fixed on the clamping module 4 and then are not dismounted until the parts are machined and inspected to be qualified.

Finally, the clamping module 4 with the set clamping is placed on the quick positioning unit 2, the positioning key 18 arranged in the X/Y direction is used for quickly positioning, the electromagnetic switch of the electromagnetic working table surface 1 of the electric spark machine tool is rotated after the setting, the clamping module 4 is tightly sucked through the magnetic conduction effect of the quick positioning plate 17, and the clamping setting is completed.

Compared with the prior art, the utility model, following outstanding characteristic has:

the utility model discloses turn into the machine-internal settlement outside the machine into, when reducing the machine-internal settlement, reduce occuping and the waste to lathe start time. The machining setting of the electric spark workpiece is generally that the machine tool is stopped and is directly set on a working table surface in the machine. In the setting process, the workpiece is fixed by mainly utilizing the simple top block and glue, the workpiece is corrected by utilizing the dial indicator, and the setting efficiency and precision are greatly influenced by the skill level and proficiency of an operator. The machine tool cannot perform electric discharge machining during the entire setting period, and belongs to the auxiliary time. The utility model discloses allow operating personnel to set for the clamping module 4 with the part that needs processing in advance outside the machine on, but when needing to switch processing part 5, when taking off the work piece of just processing completion, directly will set for in advance that a set of work piece down put into the quick positioning seat that this patent of installing in the built-in contains. By the mode, the occupation of the set workpiece on the machine tool time can be effectively reduced.

The utility model discloses a can the clamping set for the multi-disc part, improve discharge machining efficiency. The clamping setting module can clamp 6 workpieces, and 3 clamping setting modules can be installed once to the locating plate fixed on the working table surface of the machine tool, so that the quick setting of 6X3 which is 18 workpieces can be realized at most by once setting, most situations of one set of mold insert machining can be met, and the machine tool has good practicability.

The quick locking mechanism help operator to the dead time of part at the clamping in-process of clamping process, the utility model discloses avoided the adoption to promote the latch segment through the rotation driving screw and to carry out the fixed mode of locking to the part, but adopt eccentric cam mechanism to promote latch segment locking part. If the screw driving mode is adopted, an operator needs to rotate the screw when locking and dismounting each part, and the action can be completed only by rotating the screw for many circles, so that the efficiency is low; adopt cam mechanism, only need rotate half a circle locking mechanism at most and just can lock the part fast, improved the convenience of use greatly.

When the clamping module 4 is placed in the machine, the quick positioning can be realized through the positioning characteristics on the positioning plate, and the dial indicator is not needed to be used for marking and correcting.

Each fixed die module has an accurate coordinate reference and establishes a fixed machining point coordinate with the machine tool through a positioning reference on the positioning plate. When the clamping module 4 provided with the part 5 to be machined is placed in the positioning plate in the machine, the preset machining coordinate origin can be read for machining program compilation, the machining coordinate origin does not need to be set by a carbon rod as in the setting of a common single piece, and the machining setting time can be effectively shortened.

The same parts can be treated as an integral unit, the parts can be integrally detached for measurement regardless of discharge machining or trial machining, and after the measurement is finished, the parts are integrally put into a machine for debugging and repairing, and the parts are detached from the jig until the machining and detection of the parts are qualified, so that the setting and conversion efficiency between the machining equipment and the measuring equipment is improved. When a single piece setting mode is adopted, single piece clamping setting is needed in the machining process, single piece setting needs to be carried out on measuring equipment when the single piece setting is detached for detection after trial machining is completed, the measuring result is obtained and then the measuring result is returned to a machine tool to be used for clamping setting of single pieces so as to carry out adjustment machining, the efficiency is low, and the positioning is poor repeatedly.

The design of 4 main parts of clamping module has adopted the lightweight design, and outer arris limit all adopts the radius design to improve the convenience of operator in the use tool process, and can effectively avoid fish tail operator's hand.

The hole that lightweight design relates to adopts the design that the oral area seals, the recess position that the operator gripped adopts the design of oblique conical surface to quick automatic deoiling when realizing that the tool takes out from the discharge oil pond reduces the clean deoiling time of tool. The electric spark discharge machining needs to immerse the workpiece in the conductive medium oil, and when the machining is finished, the medium oil on the workpiece and the jig needs to be removed completely, so that the subsequent treatment is facilitated and the pollution to a working area is avoided.

While the present invention has been described in detail with reference to the embodiments, the scope of the present invention should not be limited to the embodiments. Various modifications and changes may be made by those skilled in the art without inventive step within the scope of the appended claims.

Claims (8)

1. The utility model provides a clamping tool suitable for accurate small-size part spark-erosion machining which characterized in that: the quick positioning device comprises a quick positioning unit, a locking unit, a clamping module and a locking adjusting block which are arranged on the electromagnetic working table of the electric spark machine tool; clamping the machined part on the clamping module through the locking adjusting block and the locking unit; the clamping module is arranged on the quick positioning unit.

2. The clamping jig suitable for electric discharge machining of the precise small parts as claimed in claim 1, wherein: the quick positioning unit comprises a quick positioning plate, three groups of positioning keys are arranged on the quick positioning plate, and the positioning keys are fixed in positioning grooves formed in one-step machining on the quick positioning plate through locking screws.

3. The clamping jig suitable for electric discharge machining of the precise small parts as claimed in claim 2, wherein: the quick positioning plate is made of a magnetizer material.

4. The clamping jig suitable for electric discharge machining of the precise small parts as claimed in claim 1, wherein: the locking unit is fixed on the clamping module base and comprises a positioning locking base, a locking block and a locking knob; the locking block is accommodated in the positioning locking base, a locking cam is arranged in the locking block, and the locking cam is sleeved on the driving shaft and is connected with the locking knob through the driving shaft.

5. The clamping jig suitable for electric discharge machining of the precise small parts as claimed in claim 4, wherein: the locking block drives the locking cam to move forwards by 0-3.5mm through the locking knob, and the locking block is used for rapidly locking the machined part.

6. The clamping jig suitable for electric discharge machining of the precise small parts as claimed in claim 1, wherein: the clamping module comprises a clamping module base, wherein the solid part of the non-functional area at the bottom of the clamping module base is hollowed, and the hollowed opening is sealed.

7. The clamping jig suitable for electric discharge machining of the precise small parts as claimed in claim 6, wherein: one clamping module clamps 6 workpieces, and 3 clamping modules are installed on the quick positioning unit.

8. The clamping jig suitable for electric discharge machining of the precise small parts as claimed in claim 1, wherein: the locking adjusting block is fixed between the locking unit and the machining part, and the locking adjusting block and the locking unit are matched for fixing and clamping the machining part.

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