JP2004090058A - Clamping device for work in press - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable connection by calking with a press in the case that the end parts of two aluminum tubes which are bent on the way are connected to flange fittings made by aluminum die casting. <P>SOLUTION: In a work clamping device for clamping a work W with a pair of clamping pieces 6, 7, a space under a clamping lever 14 becomes free by pressing the back of the clamping piece 7 by using the clamping lever 14 driven with a hydraulic cylinder 12, so the space is taken as the occupancy space for the work W such as bent piping. In this way, it is enabled that the end parts of the two aluminum tubes W2, W3 which are bent on the way are clamped and connected to the flange fittings by calking with the press. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a work clamp device for a press machine, and more particularly to a work clamp device used for connecting an end portion of a metal pipe having a bent portion and a flange fitting with a press machine.
[0002]
[Prior art]
In the processing of a refrigerant pipe of a car air conditioner, there is a step of connecting the ends of two bent aluminum pipes to an aluminum die-cast flange fitting. When the aluminum pipe is a straight pipe, it is possible to clamp the straight pipe part, insert a flange fitting, and caulk with a press from above to connect. However, in many cases, it is impossible to simply clamp the aluminum pipe from the front and rear two directions because the aluminum pipe is not straight but both are bent in three dimensions. I couldn't. Therefore, conventionally, a method of connecting the aluminum pipe and the flange fitting by brazing has been adopted, and there is a problem that an airtight test after brazing is required and the cost increases.
[0003]
[Problems to be solved by the invention]
Therefore, the present invention proposes a work clamp device that can be caulked with a press machine and connected when connecting the ends of two aluminum tubes that are bent in the middle to an aluminum die-cast flange fitting. That is the task.
[0004]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the present invention provides a work clamping device for a press machine that punches a work by clamping a work from two opposite directions using a pair of clamps. A support surface portion for supporting the lower surface of the work is slightly protruded from the center of the work, and a lower end is supported by a lower base of the press machine so as to be movable in the front-rear direction, and a support surface for supporting the lower surface of the work. The other part of the clamp is slightly receded from the center of the work, the hydraulic cylinder horizontally arranged on the side of the work clamp, and the diagonally forward part of the work clamp, which is supported and fixed to the lower base of the press machine. A fulcrum bracket and an intermediate fulcrum are pivotally supported by the fulcrum bracket, one end is rotatably connected to the rod end of the hydraulic cylinder, and the other end is the other end. And a clamp lever abutted on the back surface of the clamp member. When clamping a work, the rod of the hydraulic cylinder is advanced to press the other end of the clamp lever against the back surface of the other clamp member. .
[0005]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a front view of a press provided with a work clamping device according to the present invention, FIG. 2 is a plan view showing the work clamping device of FIG. 1 taken out, and FIG. 3 is a side view of FIG. . FIG. 4 is a diagram showing the unclamped state of FIG.
In FIG. 1, reference numeral 1 denotes a press, on which a driving hydraulic cylinder 2 is installed. Reference numeral 3 denotes a punch of the press machine 1, which is provided with first to third punches. A work clamp device 5 is provided on a lower base 4 of the press 1 below the punch 3. The right side of the work clamp device 5 is the front and the left side is the back. The work W is attached and detached from the front side, and the work W is clamped, and the punch 3 is lowered from above to caulk the work W. I do.
[0006]
2 and 3 show the work clamping device 5 in a state where the work W is clamped. The work W is made of an aluminum die-cast flange fitting W1 and aluminum pipes W2 and W3.
Consists of The aluminum pipes W2 and W3 are clamped while being inserted into the flange fitting W1 from below, and in this state, the punch 3 descends from above and the ends of the aluminum pipes W2 and W3 are expanded to be integrated with the flange fitting W1. Is done. The aluminum pipes W2 and W3 and the flange fitting W1 into which the aluminum pipes W2 and W3 are inserted are clamped by the clamps 6 and 7 from the front and rear directions.
[0007]
The rear clamp 6 is supported by a bracket 8 integrally fixed to the lower base 4 of the press. The front clamp 7 is fixed to a bracket 9 supported on the lower base 4 of the press machine so as to be movable back and forth. That is, as shown in FIG. 4, the bracket 9 was moved forward, and the clamps 6 and 7 were separated from each other. The end portions of the aluminum tubes W2 and W3 are inserted. Although not shown, the bracket 9 slides on a rail formed on the lower base 4 so as to be able to move back and forth.
[0008]
In a portion where the lower surface of the flange metal fitting W1 is supported by the clamps 6 and 7, the support surface on the side of the clamp 6 projects forward from the center position of the flange metal fitting W1 in the front-rear direction (see FIG. 3 and FIG. 3). A part of FIG. 4). Correspondingly, the support surface on the side of the clamp 7 retreats rightward from the center position of the flange fitting W1 in the front-rear direction.
[0009]
A hydraulic cylinder 12 is supported on the rear end side surface of the bracket 8 via a pin 11, and a double clevis fitting 13 at the tip of a rod 18 of the hydraulic cylinder 12 is connected to one end of a clamp lever 14. I have. When the rod 18 of the hydraulic cylinder 12 advances during clamping as shown in FIG. 2, the other end 17 presses the clamp 7 via the bracket 9. It is configured to The bracket 16 is supported and fixed to the lower base 4.
[0010]
That is, when the work clamp device 5 is unclamped, the rod 18 of the hydraulic cylinder 12 is retracted, the clamp lever 14 is rotated clockwise, the other end 17 is retracted, and the bracket 9 and the clamp 7 are moved rightward. To move to. With the clamp 7 moved to the right and the gap between the clamps 6 and 7 opened, take out the swaged flange fitting W1 and the aluminum pipes W2 and W3, and then newly insert the flange fitting W1 and the aluminum pipe W2. After setting the pipes W2 and W3, the rod 18 of the hydraulic cylinder 12 is advanced, the clamp lever 14 is rotated counterclockwise, the other end 17 is moved leftward, and the clamps 6, 7 are closed. Clamp. Next, the punch 3 is lowered to caulk the aluminum tubes W2 and W3.
[0011]
Here, the bracket 9 and the clamp 7 are biased rightward using a spring (not shown), and the clamp lever 14 rotates clockwise and the other end 17 moves downward and to the right. At this time, the bracket 9 and the clamp 7 may be configured to move rightward.
[0012]
As described above, in the present invention, the rear surface of the clamp 7 that clamps the front side of the work W is configured to be pressed by the clamp lever 14 via the bracket 9, so that the work W is swaged from the work W at the time of caulking. The load applied to the clamp 7 is supported by the clamp 6 via the other end 17 of the clamp lever 14 and the support surface A. As a result, the portion of the bracket 9 located below the clamp 7 becomes a mechanically ineffective portion that supports the load, and can be cut into an arbitrary shape to occupy the space occupied by the bent portions of the aluminum tubes W2 and W3. Thus, the ends of the two bent aluminum tubes W2 and W3 can be caulked and connected to an aluminum die-cast flange fitting W1.
[0013]
【The invention's effect】
As described above, according to the present invention, by pressing the back surface of the clamp using the clamp lever driven by the hydraulic cylinder, the space below the clamp lever is free, and the space is bent. It becomes possible to make it a space occupied by a work such as a provided pipe. As a result, when connecting the ends of the two aluminum pipes that are bent in the middle to the aluminum die-cast flange fitting, it is possible to caulk and connect with a press machine by using this work clamp device. It becomes.
[Brief description of the drawings]
FIG. 1 is a front view of a press equipped with a work clamping device according to the present invention.
FIG. 2 is a plan view showing the work clamp device of FIG. 1 taken out.
FIG. 3 is a side view of FIG. 2;
FIG. 4 is a view showing an unclamped state of FIG. 2;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Press machine 2 Hydraulic cylinder 3 Punch 4 Lower base 5 Work clamp device 6,7 Clamp 8,9 Bracket 11 Pin 12 Hydraulic cylinder 13 Double clevis bracket 14 Clamp lever 15 Support point 16 Bracket 17 Other end 18 Rod W Work W1 Flange Hardware W2, W3 Aluminum tube

Claims (1)

In a work clamp device of a press machine for clamping and punching a work from two opposite directions using a pair of clamps,
A clamper whose lower end is supported and fixed to the lower base of the press machine, and which has a support surface portion for supporting the lower surface of the work slightly protruding from the center of the work;
The other lower end of which is supported by the lower base of the press machine so as to be movable in the front-rear direction, and a support surface portion for supporting the lower surface of the work is slightly retracted from the center of the work, and
A hydraulic cylinder horizontally arranged on the side of the work clamping device,
A fulcrum bracket which is diagonally forward of the work clamp device and supported and fixed to the lower base of the press machine,
A clamp lever having an intermediate fulcrum pivotally supported by the fulcrum bracket, one end rotatably connected to the rod end of the hydraulic cylinder, and the other end abutting against the back surface of the other clamp;
A work clamp device for a press machine, wherein when clamping a work, the rod of the hydraulic cylinder is advanced to press the other end of the clamp lever against the back surface of the other clamp.

Images