CN108247206B

CN108247206B - Laser welding clamp

Info

Publication number: CN108247206B
Application number: CN201810015077.4A
Authority: CN
Inventors: 程品; 回燕华; 程宝; 刘小军; 韩锋
Original assignee: Goertek Inc
Current assignee: Goertek Techology Co Ltd
Priority date: 2018-01-08
Filing date: 2018-01-08
Publication date: 2020-05-08
Anticipated expiration: 2038-01-08
Also published as: CN108247206A

Abstract

The invention discloses a laser welding clamp, which comprises: the device comprises a workbench, wherein a pressing and holding mechanism is arranged above the workbench, a positioning mechanism is arranged below the workbench, the positioning mechanism comprises a first linear reciprocating power device, an ejector plate and a positioning pin, the ejector plate is connected with a moving part of the first linear reciprocating power device, and the positioning pin is in sliding fit with a guide hole of the workbench and is placed on the ejector plate; the pressing mechanism comprises a second linear reciprocating power device and a pressing plate, and the pressing plate is connected with a moving part of the second linear reciprocating power device. The laser welding device can reasonably position and press the laser welding workpiece, reduces the thermal deformation of the workpiece during laser welding, can effectively improve the feeding and discharging efficiency of the workpiece, and is particularly suitable for laser welding of thin sheet products and small workpieces.

Description

Laser welding clamp

Technical Field

The invention relates to the technical field of mechanical manufacturing fixtures, in particular to workpiece positioning and clamping process equipment suitable for laser welding.

Background

Laser welding, i.e. laser welding, is an efficient and precise welding method using a laser beam with high energy density as a heat source. Laser welding is one of the important aspects of the application of laser material processing technology. The laser radiation heats the surface of the workpiece, the surface heat is diffused inside through heat conduction, and the workpiece is melted by controlling parameters such as the width, the energy, the peak power, the repetition frequency and the like of laser pulse to form a specific molten pool. Due to the unique advantages, the welding method is successfully applied to the precise welding of micro and small parts.

In the prior art, when laser welding operation is performed on a sheet product, the sheet product is easy to deform due to the fact that the thickness and the area of the sheet product are large, and the processing quality of the product is affected. Meanwhile, most of the welding between the small workpieces and the thin sheet products is small, and the small workpieces are not easy to accurately position when placed on the thin sheet products with large areas, so that the standard requirements are difficult to achieve. And small workpieces are not easy to take and place, and a large amount of time is needed for placing the small workpieces, so that the production efficiency of products is influenced.

In chinese utility model patent CN205869999U, a sheet batch processing tool is disclosed, which comprises a die holder, a die cover, a directional pin, a through hole, a die cover groove and a die leg; the die holder is provided with a die cover groove, a through hole is formed in the central axis of the die cover groove, machining holes are formed in two sides of the central axis, a die holder half hole and a semicircular clamping table are arranged on the outer side edge of each machining hole, and a directional pin is arranged in the middle of the semicircular clamping table; the die cover is provided with die feet, the central axis of the die cover is provided with a positioning pin, two sides of the die cover are provided with a plurality of die cover half holes and semicircular clamping tables, and thin sheet workpieces are assembled in the semicircular clamping tables. The sheet piece processing tool assembles the sheet piece in the semicircular clamping table without corresponding support, so that the deformation of the sheet piece can be caused, and the yield of the piece is influenced.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention aims to provide a laser welding clamp to realize reasonable positioning and pressing of a laser welding workpiece, reduce thermal deformation of the workpiece during laser welding and effectively improve the loading and unloading efficiency of the workpiece.

In order to solve the technical problems, the technical scheme of the invention is as follows: a laser welding fixture, comprising: the workbench is provided with a guide hole, the workbench is fixed on a support frame, and the support frame is provided with a positioning mechanism and a pressing mechanism; the positioning mechanism comprises a first linear reciprocating power device, an ejector plate and a positioning pin, the first linear reciprocating power device is installed on the support frame, the ejector plate is located below the workbench and connected with a moving part of the first linear reciprocating power device, and the positioning pin is in sliding fit with a guide hole of the workbench and is placed on the ejector plate; the pressing mechanism comprises a second linear reciprocating power device and a pressing plate, the second linear reciprocating power device is installed on the supporting frame, and the pressing plate is located above the workbench and connected with a moving part of the second linear reciprocating power device.

The head of the positioning pin is a stepped shaft, the small head of the stepped shaft is a welding sub-part positioning part, and the shaft shoulder part of the stepped shaft is a welding female part supporting part.

Wherein the pressure plate is provided with a convex welding sub-piece pressure head.

Wherein, the clamp plate is provided with a welding female part shaping surface.

The workbench is fixedly connected with an ejector plate guide post, and the ejector plate guide post is in sliding fit with a guide hole of the ejector plate.

The ejector plate guide column sleeve is provided with a limiting sleeve, and the limiting sleeve is located between the workbench and the ejector plate.

Wherein, the locating pin cover is equipped with compression spring.

Wherein the first linear reciprocating power device and the second linear reciprocating power device are cylinders.

And a guide bush is fixedly arranged in the guide hole of the workbench and is in sliding fit with the positioning pin.

The supporting frame comprises a bottom plate and a side plate, and the side plate is fixedly connected between the bottom plate and the workbench.

After the technical scheme is adopted, the invention has the beneficial effects that:

1) the pressing plate is arranged above the workbench, the ejection plate is arranged below the workbench, the positioning pin is in sliding fit with the guide hole of the workbench and is placed on the ejection plate, the ejection plate pushes the positioning pin to extend upwards out of the supporting table surface of the workbench under the driving of the first linear reciprocating power device, at the moment, the welding master part can be placed on the supporting table surface of the workbench and accurately positioned by the positioning pin, and then the welding sub-part is sleeved at the head of the positioning pin and is placed on the welding master part, so that the relative positions of the welding sub-part and the welding master part are accurately positioned; the pressure plate is driven by the second linear reciprocating power device to press and hold the welding sub-piece on the welding parent-piece, and when laser welding is carried out, the welding sub-piece and the welding parent-piece are subjected to double-side pressing and holding force, so that the thermal deformation of a workpiece during laser welding is reduced; after welding, the positioning pin and the pressing plate return under the driving of respective power devices respectively to be separated from the workpiece, and the qualified products subjected to laser welding can be taken out easily.

2) The head of the positioning pin is designed into a stepped shaft shape, the small shaft part of the stepped shaft is used for positioning the welding sub-part, the shaft shoulder part of the stepped shaft provides support for the welding mother part, and when the pressing plate presses down, the pressing plate acts on the downward force of the welding sub-part and the supporting force of the shaft shoulder part of the stepped shaft to the welding mother part to firmly press and hold the welding sub-part on the welding mother part, so that the welding quality is ensured.

3) The clamp plate sets up welding son pressure head and the whole face of welding mother spare, and the welding son pressure head is used for pressing the welding son with the cooperation of the welding mother spare supporting part of locating pin and holds on the welding son, and the whole face of welding mother spare cooperatees with the support mesa of workstation, prevents that the welding mother spare is heated deformation warpage in welding process.

4) The stop collar is established to the guide post cover, and the axial length of stop collar is relevant with the extension height of locating pin, and when stop collar length was suitable, the welding female member can not be by the top from the workstation, can hold the reliable pressure of welding female member on the support mesa of workstation when the clamp plate pushes down, reduces welding heat altered shape, avoids the locating pin to be excessively ejecting, makes the work piece avoid the pressure by force.

5) The spring is established to the locating pin cover, and on the one hand exerts for the top board and then plays the cushioning effect to the last jacking force of acting on the locating pin for first straight reciprocating power device, and on the other hand when first straight reciprocating power device return, helps locating pin and work piece separation, further improves the efficiency of unloading.

In conclusion, the laser welding device can reasonably position and press the laser welding workpiece, not only reduces the thermal deformation of the workpiece during laser welding, but also effectively improves the feeding and discharging efficiency of the workpiece, has simple and convenient feeding and discharging, strong universality, saves the feeding and discharging times, avoids the deformation risk of multiple feeding and discharging, improves the qualification rate of products, and is particularly suitable for laser welding of sheet products and small workpieces.

Drawings

FIG. 1 is a schematic perspective view of a laser welding jig according to an embodiment of the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1 at I;

FIG. 3 is a longitudinal cross-sectional view of the embodiment of FIG. 1 in a workpiece holding position;

FIG. 4 is a schematic structural view of the embodiment of FIG. 1 showing the locating pin in a top-up position;

FIG. 5 is a schematic view of the arrangement of the workpiece placement state of the embodiment shown in FIG. 1;

FIG. 6 is a schematic view showing a state where a pressing plate of the embodiment shown in FIG. 1 is pressed;

FIG. 7 is a schematic structural view of the reset state of the pressure plate and the locating pin of the embodiment shown in FIG. 1;

in the figure, 10-workbench, 11-side plate, 12-bottom plate, 13-guide bush, 20-press plate, 201-shaping surface, 202-welding sub-part press head, 21-pressing cylinder, 30-positioning pin, 301-welding sub-part positioning part, 302-welding mother part supporting part, 31-ejecting plate, 32-compression spring, 33-ejecting cylinder, 34-limiting sleeve, 35-ejecting plate guide column, 40-thin sheet product and 41-welding small part.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings and examples.

The invention takes a sheet product and a small welding piece as an example, and introduces the specific structure of the laser welding clamp in detail. The thin sheet product has large area and thin thickness (for example, the thickness is 0.2mm), and can be called as a welding parent part in a wider sense; the welding tip is a ring-like part in this embodiment, which is very small in size (e.g., 1mm in diameter and 1mm in height), and may be referred to in a broader sense as a welding tip, and the laser welding fixture disclosed in this embodiment is the tooling for providing a fixed position and pressure for welding the tip and the sheet product for laser welding.

As shown in fig. 1, 2 and 3, a laser welding jig has a table 10 fixed to a support frame, which mainly includes two parts, a side plate 11 and a bottom plate 12, wherein the side plate 11 is fixedly connected between the table 10 and the bottom plate 12. The stationary table 10 is used to support the sheet product 40 and ensure that the sheet product 40 is not deformed by the upward pressure. The side plate 11 has a side supporting function and provides a support supporting function for the whole set of jig. The bottom plate 12 plays a role in fixing, and the upper mechanism can be stably placed on a desktop.

The pressing and holding mechanism of the laser welding fixture is arranged above the workbench 10 and mainly comprises a pressing cylinder 21 and a pressing plate 20, the pressing cylinder 21 is arranged on the supporting frame, and the pressing plate 21 is located above the workbench 10 and connected with a piston rod of the pressing cylinder 21. The push-down cylinder 21 and the push-up cylinder 33 to be mentioned below are used as a linear reciprocating power device, and from the viewpoint of those skilled in the art, the push-down cylinder 21 or the push-up cylinder 33 may be replaced by a power device such as an oil cylinder or an electric push rod, and it is more appropriate to select a cylinder in consideration of pressure, speed, cost, and the like. Therefore, the upper jack cylinder 33 may be broadly referred to as a first linear reciprocating power unit, and the lower jack cylinder 21 may be broadly referred to as a second linear reciprocating power unit.

The platen 20 is provided with a raised weld daughter ram 202 and a weld mother profile 201. The welding sub-part pressure head 202 is used for being matched with the welding main part supporting part 302 of the positioning pin 30 to press and hold the thin sheet product 40 on the small welding part 41, and the welding main part shaping surface 201 is matched with the supporting table surface 10 of the workbench to prevent the thin sheet product 40 from being heated, deformed and warped in the welding process.

The positioning mechanism of the laser welding fixture is arranged below the workbench 10 and mainly comprises an upper ejection cylinder 33, an ejection plate 31 and a positioning pin 30, the upper ejection cylinder 33 is mounted on the support frame, the ejection plate is connected with a piston rod of the upper ejection cylinder 33, the positioning pin 30 is in sliding fit with a guide hole of the workbench 10 and is placed on the ejection plate 31, and the guide hole of the workbench 10 is a through hole, so that the positioning pin 30 can conveniently extend out of a support table surface of the workbench 10 from bottom to top. In order to improve the reliability of use, a guide bush 13 is fixedly provided in a guide hole of the table, and at this time, the guide bush 13 is slidably fitted to the positioning pin 30.

As shown in fig. 7, the head of the positioning pin 30 is a stepped shaft, the small head of the stepped shaft is a welding sub positioning portion 301, and the shoulder of the stepped shaft is a welding parent support portion 302. The welding sub-part positioning part 301 is used for positioning the welding small part 41, the welding parent-part supporting part 302 provides support for the sheet product 40, and when the pressing plate 20 presses downwards, the pressing force of the pressing plate 20 acting on the welding small part 41 and the supporting force of the welding parent-part supporting part 302 on the sheet product 40 firmly press the welding small part 41 on the sheet product 40, so that the welding quality is ensured.

The positioning pin 30 is sleeved with a compression spring 32. On one hand, the upper jacking force which is applied to the upper jacking plate 31 by the upper jacking cylinder 33 and acts on the positioning pin 30 plays a role in buffering, and on the other hand, when the upper jacking cylinder 33 returns, the positioning pin 30 is assisted to be separated from the workpiece, and the unloading efficiency is further improved.

One end of the ejector plate guide column 35 is in threaded connection with the workbench 10, and the ejector plate guide column 35 is in sliding fit with the guide hole of the ejector plate 31 so as to provide guidance for the ejector plate 31 in the up-and-down moving process. The ejector plate guide post 35 is sleeved with a limit sleeve 34, and the limit sleeve 34 is located between the workbench 10 and the ejector plate 31. The axial length of the limiting sleeve 34 is related to the extending height of the positioning pin 30, when the length of the limiting sleeve 34 is proper, the welding female part 40 cannot be ejected from the workbench 10, and the welding female part is reliably pressed and held on a supporting table top of the workbench 10 when the pressing plate 20 presses down, so that the welding thermal deformation is reduced, the positioning pin 30 is prevented from being ejected excessively, and the workpiece is prevented from being pressed forcibly.

The working principle and the working process of the embodiment are as follows:

1) the positioning pin is pushed up, and as shown in fig. 4, the pushing plate 31 pushes the positioning pin 30 to extend upward out of the supporting table surface of the workbench 10 under the driving of the pushing cylinder 33.

2) And (3) mounting the workpiece, as shown in fig. 5, placing the sheet product 40 on the supporting table surface of the workbench 10, accurately positioning the sheet product by using the positioning pin 10, sleeving the welding small piece 41 on the welding sub-piece positioning part 301 of the positioning pin 30, and placing the welding small piece 41 on the sheet product 40, so that the relative positions of the welding small piece 41 and the sheet product 40 are accurately positioned.

3) The pressing plate is pressed downwards, as shown in fig. 6, the pressing plate 20 is driven by the pressing cylinder 21 to press the small welding piece 41 on the sheet product 40, and laser welding is performed.

4) And (3) resetting the positioning pin and the pressing plate, as shown in fig. 7, after welding is finished, the positioning pin 30 and the pressing plate 20 are respectively driven by respective power devices to return and separate from the workpiece, and qualified products after laser welding can be easily taken out.

Through the embodiment, the laser welding device can reasonably position and press the laser welding workpiece, not only reduces the thermal deformation of the workpiece during laser welding, but also can effectively improve the feeding and discharging efficiency of the workpiece, is simple and convenient to feed and discharge, has strong universality, saves the feeding and discharging times, avoids the deformation risk of multiple feeding and discharging, and improves the product yield.

The laser engraving fixture is suitable for laser welding of thin sheet products and small pieces, and can be used as a laser engraving fixture by slightly modifying the embodiment, for example, removing a welding sub-piece pressure head, replacing the whole surface of a welding mother piece with the pressing surface of an engraving piece. In conclusion, all such modifications made based on the concept, principle, structure and method of the present invention will fall within the scope of the present invention.

Claims

1. A laser welding fixture, comprising:

the workbench is provided with a guide hole, the workbench is fixed on a support frame, and the support frame is provided with a positioning mechanism and a pressing mechanism; it is characterized in that the preparation method is characterized in that,

the positioning mechanism comprises a first linear reciprocating power device, an ejector plate and a positioning pin, the first linear reciprocating power device is installed on the support frame, the ejector plate is located below the workbench and connected with a moving part of the first linear reciprocating power device, and the positioning pin is in sliding fit with a guide hole of the workbench and is placed on the ejector plate;

the pressing mechanism comprises a second linear reciprocating power device and a pressing plate, the second linear reciprocating power device is installed on the supporting frame, and the pressing plate is located above the workbench and connected with a moving part of the second linear reciprocating power device;

2. The laser welding jig of claim 1 wherein the pressure plate is provided with a raised weld sub head.

3. The laser welding jig of claim 2, wherein the pressure plate is provided with a weld master shaping surface.

4. The laser welding jig of claim 3, wherein the table is fixedly connected with ejector plate guide posts that are slidably engaged with guide holes of the ejector plate.

5. The laser welding jig of claim 4, wherein the ejector plate guide post sleeves are provided with stop sleeves, the stop sleeves being located between the table and the ejector plate.

6. The laser welding jig of claim 5, wherein the locating pin is sleeved with a compression spring.

7. The laser welding jig of claim 1, wherein the first linear reciprocating power device and the second linear reciprocating power device are air cylinders.

8. The laser welding jig of claim 1, wherein a guide bushing is fixedly disposed in the guide hole of the table, and the guide bushing is in sliding fit with the positioning pin.

9. The laser welding jig of claim 1, wherein the support frame comprises a bottom plate and a side plate, the side plate being fixedly coupled between the bottom plate and the table.