WO2017031796A1 - Universal flexible fixture and using method therefor - Google Patents

Abstract

A universal flexible fixture comprises a base (7), a phase change material cavity (6) mounted on the base, positioning bodies (4) mounted in the phase change material cavity, clamping bodies (2), and a heat dissipation block (3). A method for using the fixture comprises: connecting a phase change material cavity to a base by means of screws; placing the positioning bodies on the base in the phase change material cavity by means of numerical control positioners, and attracting the positioning bodies to the base by means of bottom permanent magnets (12); placing the clamping bodies on the base in the phase change material cavity by means of numerical control positioners, and attracting the clamping bodies to the base by means of bottom permanent magnets (20); and pouring a phase change material (5) to enable the positioning bodies, the clamping bodies, the phase change material cavity and the base to be fixedly connected together to form a set of fixture. Lengths of the positioning bodies can be continuously adjusted, heights of the clamping bodies can be continuously adjusted, and positions of the positioning bodies and the clamping bodies can be arbitrarily arranged, so as to form a fixture of parts having arbitrary complicated shapes and arbitrary sizes. Parts of the fixture have simple shapes and low manufacturing precision requirements; and the phase change material can be repeatedly used.

Description

 Specification Name of Invention: Universal Flexible Fixture and Method of Using the Same Technical Field

 [0001] The present invention relates to the field of machining and assembly technology, and in particular to a flexible clamp based on a phase change material, which can truly realize the positioning and clamping of parts of any shape and any size.

 Background technique

 [0002] At present, with the advancement of technology, people's demand for products is becoming more and more versatile, personalized and diverse.

. It is reflected in the shorter and shorter life of the product (faster replacement), more and more new products, and smaller and smaller batch sizes. These pose great challenges for manufacturers, and the size and shape of the parts being machined are varied and completely unpredictable. In order to reduce the design and manufacture of fixtures and shorten the production preparation time, only flexible fixtures are used. The flexible clamp is the same fixture that can perform the positioning and clamping of different types of different size parts. At present, the most widely used flexible clips are of two types, one is an adjustable clamp, which is mainly for the same type of parts, and the clamping of the same type of parts is achieved by adjusting the size and position of the clamping element of the positioning fixture component; the other is the combination Fixtures (modular fixtures), combined fixtures are clamps that are assembled using modular serialized standard parts.

 technical problem

 [0003] There are many deficiencies in the prior art flexible fixtures:

 [0004] (1) The adjustable clamp can only be used for the same type of parts, and cannot be clamped with other types of parts;

 [0005] (2) Although the combined jig can be combined to meet the clamping of different types of parts, there are still the following defects:

[0006] 1) high quality requirements of the combined components;

[0007] 2) The first placement fee is high;

 [0008] 3) Because it is a combined superimposed "^ building block", the flexible jig is less rigid and difficult to adapt to heavy cutting.

[0009] 4) It is difficult to clamp irregularly shaped parts;

 [0010] 5) the combined size is serialized rather than continuously changing;

[0011] 6) assembly debugging requires high technology; Technical solution

 [0013] The applicant provides a universal flexible jig and a method for using the same in the prior art, thereby effectively overcoming the defects of the prior art flexible jig and realizing arbitrarily complex shapes and parts of any size. The clamping is flexible and the use is greatly improved.

 [0014] The technical solution adopted by the present invention is as follows:

 [0015] A universal flexible clamp includes a base, a phase change material cavity is mounted on an upper portion of the base, and a clamping body and a positioning body are mounted in the phase change material cavity, and the clamping body is clamped The position is placed on a pedestal in the phase change material cavity, the positioning body is placed on the susceptor in the phase change material cavity according to the positioning requirement, and the clamping body, the positioning body, the phase change material cavity and the pedestal pass Casting the solid phase change material together; the top of the clamping body is mounted with a clamping head, the top of the positioning body is provided with a positioning head, and the clamping head and the positioning head are both abutted with the workpiece; A plurality of heat dissipating blocks are evenly distributed on the base of the phase change material chamber, and the heat dissipating blocks are connected by a flexible hose, and the ice water is passed through.

 [0016] As a further improvement of the above technical solution:

 [0017] The clamping head adopts a pressure plate or a pneumatic hydraulic clamping structure.

 [0018] The solid phase change material is a low melting tin antimony alloy, and the solid phase change material has a melting point of 60 to 70 degrees.

 [0019] The phase change material cavity is a side wall multi-ribbed structure, and is mounted on the base by screws.

[0020] The structure of the positioning body is: comprising a positioning seat, the bottom of the positioning seat is provided with a counterbore, the positioning hole is mounted in the counterbore, and the positioning body phase change material is disposed on the side wall of the countersunk hole of the positioning seat The bottom of the positioning head is rigidly fixed to the positioning seat by filling the positioning body phase change material, and the positioning seat permanent magnet embedded in the bottom surface of the positioning seat absorbs the positioning seat and the base.

[0021] The positioning body phase change material has a melting point temperature of 80 to 90 degrees.

[0022] The structure of the clamping body is: comprising a clamping body base, the clamping body base is mounted with a clamping body base, the clamping body base is a cylindrical structure, and the clamping body base has a cuff on the top a hole, the inner wall of the closing hole is provided with an internal thread, and the clamping height adjusting body is inserted into the base body of the clamping body by screwing, and the side wall of the clamping body base is provided with a filling port for the phase change material of the clamping body And clamping the phase change material under the filling port, by adding Note that the clamping body phase change material realizes rigid fastening of the clamping height adjusting body and the clamping body base, and the clamping height adjusting body is mounted on the top of the clamping head, and the clamping head is perpendicular to the clamping height adjusting body; The clamping seat permanent magnet is embedded in the bottom surface of the clamping body base, and the clamping body and the base are sucked.

 [0023] The clamping body phase change material has a melting point temperature of 80 to 90 degrees.

 [0024] The structure of the heat dissipating block is: a U-shaped flow channel is arranged inside, and is made of brass, and the pipe joints on both sides of the heat dissipating block are connected by a flexible hose into a cooling flow channel, and the space is evenly distributed on the pedestal. Arrange; connect one or more ways with a flexible hose.

 [0025] A method of using a universal flexible clamp includes the following steps:

 [0026] Step 1: According to the processing or assembly requirements of the workpiece, determine the positioning position and the clamping position, determine the adjustment length of each positioning body and the clamping body, and determine the series of the fixture;

[0027] The second step: adjusting the fixed length tool to the required length, loading the positioning head into the positioning seat, placing it into the tool, and pressure-adding the low-melting-point positioning body phase change material, and the phase change by the auxiliary cooling device The material is cooled, and after cooling and solidifying, the positioning body is taken out; the same method is used to make other positioning bodies;

[0028] The third step: loading the clamping height adjusting body into the clamping body base, rotating and adjusting the clamping height adjusting body to make the total length of the clamping body reach the required length, and then through the clamping body phase change material filling port and The filler body phase change material is filled under the injection port, the molten low melting point clamping body phase change material is pressurized, and the phase change material is cooled by the auxiliary cooling device, and the clamping body is taken out after cooling and solidifying; Method of making other clamping bodies; [0029] Step 4: mounting the phase change material cavity to the base;

[0030] Step 5: positioning the positioning body and the clamping body to the base by the numerical control arrangement machine tool;

[0031] Step 6: Filling the melted low-melting solid phase change material, and using the auxiliary cooling device to improve the cooling efficiency, shortening the cooling time, and when the phase change material is completely cooled and solidified, the clamping head is equipped. The fixture can be used;

 [0032] Step 7: After the fixture is used, heating and melting the phase change material, taking out the clamping body, the positioning body, separating the positioning head and the positioning seat, separating the clamping height adjusting body and the clamping body, recovering the phase change material, and clamping the component Back to the income library, to be used next time

 Advantageous effects of the invention

 Beneficial effect

[0033] The invention is compact, reasonable and easy to operate. The length of the positioning body is continuously adjustable, and the height of the clamping body is continuous. The position of the adjustment, positioning body and clamping body can be arbitrarily arranged, thereby realizing the clamping of any complicated shape and any size parts. The accuracy of the fixture is achieved by precisely adjusting the positioning length, the height of the clamping body, and the precise positioning of the CNC. Therefore, the manufacturing precision of the components is low, and the shape of the components is simple, and the manufacturing cost of the fixture is extremely low. The number of fixture parts is small, and there are only a few fixture parts in one size range. The number of fixtures required for covering all possible size ranges is small, the purchase cost is low, and the fixture management is simple. Fixture repair is simple, phase change material can be used repeatedly, fixture life is long, easy to remanufacture recycling, green environmental protection

 DRAWINGS

 1 is a schematic structural view of the present invention.

2 is a schematic structural view of a positioning body of the present invention.

3 is a schematic structural view of a clamping body of the present invention.

[0037] wherein: 1, the workpiece; 2, the clamping body; 3, the heat sink; 4, the positioning body; 5, the solid phase change material; 6, the phase change material cavity; 7, the base; 8, positioning head; 9, positioning seat; 10, phase change material is positioned; 11, positioning phase change material filler; 12, spud permanent magnet; 13, the clamping head; 14, height adjustment of the clamping member; _15, Filling port on the phase change material of the clamping body; 16. The base body of the clamping body; 17. Phase change material of the clamping body; 18. Filling port under the phase change material of the clamping body; 19. Clamping body base; 20, clip Tightly held permanent magnets.

Embodiments of the invention

As shown in FIG. 1 , FIG. 2 and FIG. 3 , the universal flexible clamp of the embodiment includes a base 7 , and a phase change material cavity 6 is mounted on the upper portion of the base 7 , and the phase change material cavity 6 is mounted therein. The clamping body 2 and the positioning body 4, the clamping body 2 is placed on the base 7 in the phase change material cavity 6 in the clamping position, and the positioning body 4 is placed in the base of the phase change material cavity 6 according to the positioning requirements. 7 , the clamping body 2, the positioning body 4, the phase change material cavity 6 and the base 7 are fixed together by casting the solid phase change material 5; the positioning body 4 and the clamping body 2 are realized on the plane. Positioning, the top of the clamping body 2 is mounted with a clamping head 13, the top of the positioning body 4 is provided with a positioning head 8, the clamping head 13 and the positioning head ₈ are abutted with the workpiece 1; located in the phase change material cavity 6 The base 7 is evenly distributed with a plurality of heat dissipating blocks 3, and the heat dissipating blocks 3 are connected by a flexible hose, and the ice water is passed through. Achieve rapid cooling and solidification of phase change materials. [0039] The clamping head 13 employs a pressure plate or a pneumatic hydraulic clamping structure.

 [0040] The solid phase change material 5 is a low melting point tin-bismuth alloy, and the solid phase change material 5 has a melting point of 60 to 70 degrees. The expansion ratio is controlled at 0.01% by adjusting the ratio of the two materials.

 [0041] The phase change material cavity 6 is a side wall multi-ribbed structure, and is mounted on the base 7 by screws.

 [0042] The structure of the positioning body 4 is: including a positioning seat 9, the bottom of the positioning seat 9 has a counterbore, the positioning head 8 is installed in the counterbore, and the side wall of the positioning hole 9 is provided with a phase change of the positioning body. The material filling port 11 , the bottom of the positioning head 8 is rigidly fixed to the positioning seat 9 by filling the positioning phase change material 10 , and the positioning seat permanent magnet 12 is embedded in the bottom surface of the positioning seat 9 to suck the positioning seat 9 and the base 7 Hehe. It is ensured that the positioning body 4 and the base 7 have a certain suction force to avoid casting the phase change material and the positioning body 4 to roll or shift.

 [0043] The positioning body phase change material 10 has a melting point of 80 to 90 degrees.

 [0044] The structure of the clamping body 2 is: comprising a clamping body base 19, the clamping body base 16 is mounted on the clamping body base 16, the clamping body base 16 is a cylindrical structure, and the clamping body base 16 has a closed top The inner wall of the hole is provided with an internal thread, and the clamping height adjusting body 14 is inserted into the clamping body base 16 by screwing, and the side wall of the clamping body base 16 is provided with a filling port for the phase change material of the clamping body. And the filling port 18 of the clamping body phase change material, the rigid fixing of the clamping height adjusting body 14 and the clamping body base 16 is realized by filling the clamping body phase change material 17, and the clamping height adjusting body 14 top mounting clip The clamping head 13 is perpendicular to the clamping height adjusting body 14; the clamping seat permanent magnet 20 is embedded in the bottom surface of the clamping body base 19, and the clamping body 2 and the base 7 are sucked. To avoid casting the phase change material 吋 clamping body 2 rollover or displacement.

 [0045] The clamping body phase change material 17 has a melting point of 80 to 90 degrees.

 [0046] The structure of the heat dissipating block 3 is: U-shaped flow channel is arranged inside, is made of brass, the heat dissipation effect of the brass is good, the pipe joints on both sides of the heat dissipating block 3 are connected by the flexible hose into the cooling flow channel, and The vacant position on the pedestal 7 is evenly arranged; the flexible hose is connected into one or more ways, and ice water is introduced to realize rapid cooling of the phase change material.

 [0047] The design of the counterbore in the positioning seat 9 of the present invention has a stepped structure formed therein, which strengthens the joint strength and rigidity of the phase change material.

 [0048] The clamping body base 16 of the present invention is screwed with a threaded connection and a phase change material, which greatly improves the reliability of the connection and ensures its strength and rigidity.

[0049] The method for using the universal flexible clamp of the embodiment includes the following steps: [0050] Step 1: According to the processing or assembly requirements of the workpiece 1, determine the positioning position and the clamping position, determine the adjustment length of each positioning body 4 and the clamping body 2, and determine the series of the fixture;

 [0051] The second step: adjusting the special fixed length tool to the required length, loading the positioning head 8 into the positioning seat 9, putting it into the tool, and pressure-filling the low melting point positioning body phase change material 10, and the auxiliary cooling by the auxiliary cooling The device cools the phase change material, and after cooling and solidifying, the positioning body 4 is taken out; the same method is used to make other positioning bodies 4;

 [0052] The third step: the clamping height adjusting body 14 is loaded into the clamping body base 19, and the clamping height adjusting body 14 is rotated to adjust the total length of the clamping body 2 to a desired length, and then through the clamping body phase change material The filling port 15 and the clamping body phase change material lower filling port 18, the pressure is filled with the melted low melting point clamping body phase change material 17, and the phase change material is cooled by the auxiliary cooling device, and after cooling and solidifying Take out the clamping body 2; the same method to make other clamping body 2;

 [0053] The fourth step: mounting the phase change material cavity 6 to the base 7;

 [0054] The fifth step: positioning the positioning body 4 and the clamping body 2 to the base 7 by the numerically arranged machine tool;

 [0055] The sixth step: filling the molten low-melting solid phase change material 5, and using the auxiliary cooling device to improve the cooling efficiency, shortening the cooling time, and when the phase change material is completely cooled and solidified, the clamping head is provided. 13, the fixture can be used;

 [0056] Step 7: After the jig is used, heating and melting the phase change material, taking out the clamping body 2, the positioning body 4, separating the positioning head 8 and the positioning seat 9, separating the clamping height adjusting body 14 and the clamping body 2, and recycling The phase change material, the fixture component is returned to the revenue store, and will be used next time.

Claims

Claim A universal flexible jig, comprising: a base (7), a phase change material cavity (6) is mounted on an upper portion of the base (7), and a clip is mounted in the phase change material cavity (6) a clamping body (2) placed on the base (7) in the phase change material cavity (6) in a clamping position, the positioning body (4) Placed on the base (7) in the phase change material cavity (6) according to the positioning requirements, the clamping body (2), the positioning body (4), the phase change material cavity (6) and the base (7) ) is fixed by casting a solid phase change material (5 ); a clamping head (13) is mounted on the top of the clamping body (2), and a positioning head is arranged on the top of the positioning body (4) The clamping head (13) and the positioning head (8) are both in contact with the workpiece (1); the heat dissipation block is evenly distributed on the base (7) in the phase change material cavity (6) ( ₃ ), the heat sink block (3) is connected by a flexible hose, and the ice water is passed through. A universal flexible clamp according to claim 1, wherein: said clamping head (13) is of a pressure plate or a pneumatic hydraulic clamping structure. The universal flexible jig according to claim 1, wherein: said solid phase change material (5) is a low melting point tin-bismuth alloy, and said solid phase change material (5) has a melting point of 60 to 70. degree. The universal flexible jig according to claim 1, wherein the phase change material cavity (6) is a side wall multi-ribbed structure and is mounted on the base (7) by screws. The universal flexible clamp according to claim 1, wherein: the positioning body (4) has a structure comprising: a positioning seat (9), the positioning seat (9) has a counterbore at the bottom, and the counterbore is installed inside. The positioning head (8) and the positioning hole (9) are provided with a positioning body phase change material filling port (11) on the side wall of the counterbore, and the bottom of the positioning head (8) is filled with the positioning phase change material. (10) Realizing rigid connection with the positioning seat (9), the positioning seat permanent magnet (12) embedded in the bottom surface of the positioning seat (9), and the positioning seat (9) and the base (7) are sucked. The universal flexible jig according to claim 5, wherein: said positioning body phase change material (10) has a melting point of 80 to 90 degrees. A universal flexible clamp according to claim 1, characterized by: structure of the clamping body (2) The utility model comprises: a clamping body base (19), a clamping body base body (16) is mounted on the clamping body base (19), the clamping body base body (16) is a cylindrical structure, and the clamping body base body (16) The top end has a closing hole, the inner wall of the closing hole is provided with an internal thread, and the clamping height adjusting body (14) is screwed into the clamping body base (16), the clamping body base (16) The side wall is provided with a filling port (15) for the phase change material of the clamping body and a filling port (18) for the phase change material of the clamping body, and the clamping height is realized by adding the phase change material (17) of the clamping body. The rigid body of the adjusting body (14) and the clamping body base (16), the clamping height adjusting body (14) is mounted on the top of the clamping head (13), the clamping head (13) and the clamping height adjustment The body (14) is vertical; the clamping seat permanent magnet (20) is embedded in the bottom surface of the clamping body base (19), and the clamping body (2) and the base (7) are sucked.  [Claim 8] The universal flexible jig according to claim 7, wherein: the clamping body phase change material (17) has a melting point of 80 to 90 degrees. [Claim 9] The universal flexible jig according to claim 1, wherein: the heat dissipating block (3) has a structure in which: a U-shaped flow path is provided inside, and is made of brass, and the heat dissipating block (3) The pipe joints on both sides are connected by a flexible hose into a cooling flow passage, and are evenly arranged in the vacant position on the base (7); one or more paths are connected by a flexible hose. [Claim 10] A method of using the universal flexible jig according to claim 1, comprising the steps of:  Step 1: Determine the positioning position and clamping position according to the machining or assembly requirements of the workpiece (1), determine the adjustment length of each positioning body (4) and clamping body (2), and determine the series of fixtures; Step 2: The fixed length tool is adjusted to the required length, the positioning head (8) is loaded into the positioning seat (9), placed in the tool, and the low melting point positioning phase change material (10) is pressure-filled, and the auxiliary cooling device is opposite to the phase. The variable material is cooled, and after cooling and solidifying, the positioning body (4) is taken out; the same method is used to make other positioning bodies (4); Step 3: Insert the clamping height adjustment body (14) into the clamping body base (19), and adjust the clamping height adjustment body (14) to make the total length of the clamping body (2) reach the required length, and then clamp The phase change material is filled with a filling port (15) and a clamping body phase change material under filling port (18), and the molten low melting point clamping body phase change material (17) is pressurized, and the auxiliary cooling device is installed. The phase change material is cooled, and after cooling and solidification, the clamping body (2) is taken out; the same method is used to make other clamping bodies (2); Step 4: Mount the phase change material cavity (6) to the base (7); Step 5: Positioning the positioning body (4) and the clamping body (2) onto the base (7) by the numerically arranged machine tool; Step 6: Fill the melted low-melting solid phase change material (5), and use the auxiliary cooling device to improve the cooling efficiency and shorten the cooling time. When the phase change material is completely cooled and solidified, the clamping head is equipped. 13), the fixture can be used; Step 7: After the fixture is used, heat and melt the phase change material, take out the clamping body (2), the positioning body (4), separate the positioning head (8) and the positioning seat (9), and separate the clamping height adjustment body (1 4 ) and the clamping body (2), recovering the phase change material, and the fixture components are returned to the revenue library for use next time.