JPS6234692Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> The disclosed technology belongs to the field of structural technology for a device that clamps a low-rigidity workpiece without imparting clamping strain to the workpiece when performing predetermined machining. .

This invention relates to a clamping device in which a link clamp is moved laterally forward and backward via an elevating link before and after setting a low-rigidity work such as a constant velocity joint cage of an automobile. In particular, when a workpiece is set on the set frame, the control plate, which the link clamp comes into contact with and is guided in a sliding state through the gap in which the link clamp advances and retreats, contracts due to the overstroke of the link clamp, which causes clamping strain on the workpiece. This invention relates to a clamping device that is attached to a set frame via an elastic material such as rubber having a small elastic modulus.

<Prior Art> As is well known, in processing and forming processes such as grinding of metal workpieces, the target workpiece is usually clamped to a processing device.

<Problems to be solved by the invention> However, for example, when clamping a low-rigidity workpiece such as the cage of a constant velocity joint in an automobile using a general clamping device that applies pressing force, clamping distortion occurs. This has the disadvantage of having a large effect on machining accuracy, requiring a considerable amount of training to correct it after machining, and having poor mass productivity.

Although it is theoretically possible to design a clamping device that does not cause clamping distortion by providing a special sensor to deal with this problem, it has the disadvantage of high cost and also has the disadvantage of requiring cumbersome maintenance. be.

The purpose of this invention is to solve the technical problem of clamping low-rigidity workpieces based on the above-mentioned conventional technology, and to solve the problem of clamping workpieces with low rigidity based on the above-mentioned conventional technology. Make sure to control the link clamp,
It is an object of the present invention to provide an excellent clamping device which provides a clamping stroke absorption effect and which is beneficial to the field of processing technology application in the machine manufacturing industry.

<Means/effects for solving the problems> In order to solve the above-mentioned problems, the structure of this invention, which is based on the scope of the above-mentioned utility model registration claims, is based on the above-mentioned problems. When it is engaged and set, the elevating link rises and the link clamp pivots via the pin pivot, the curved part slides into contact with the control plate at the top, and the clamp hook at the tip engages the workpiece. During this time, the control plate uses a rubber or other elastic force with a pre-given elastic modulus so that it will contract due to the overstroke of the link clamp, which causes clamping strain on the workpiece in the process of the lifting link rising. This technology prevents the bullet from contracting and escaping in the event of overstroke and causing clamping distortion to the workpiece, and also ensures that incorrect clamping is immediately confirmed if proper clamping is not performed. The measures were taken.

<Example> Next, an example of this invention will be described below based on the drawings.

Reference numeral 1 denotes a clamping device which constitutes the gist of this invention, and its cylindrical set frame 2 has a circular hook flange 4 on the bottom for setting and engaging a low-rigidity workpiece, for example, a cage 3 of a constant velocity joint of an automobile. A pair of slits 5 are formed on both sides of the upper portion to serve as gaps, and the base 6 is fixed to the base 6 with bolts or the like (not shown).

Further, a circular hole 7 concentrically bored inside the set frame 2 communicates with a circular hole 8 of the base 6.
A push rod 10 as an elevating link having a forked fork portion 9 in its upper part is linked to a hydraulic cylinder 12 fixed in a circular hole 8 via a rod 11 provided below the push rod 10 so as to be able to move up and down.

A pair of left and right protruding link clamps 14, 14 whose upper surfaces are curved from upward to outward are pivotally supported on the fork portion 9 of the push rod 10 via pins 13, and clamp hooks 15, 15 at the ends thereof.
is guided by the fork portion 9 and is movable laterally through the slit 5 to provide a clamping action to the workpiece 3 in cooperation with the hook flange 4.

A cap 18 having a slit 17 on the upper surface 16 of the set frame 2 is connected to the bolts 19 and 1.
Each link clamp 14 has a rubber plate 20 as an elastic machine having a predetermined elastic modulus that contracts when the cage 3 is overstroked, which causes clamping strain on the cage 3. A control plate 21 is placed on the upper surface 16 of the set frame 2, interposed in the upper part, and is brought into contact with the link clamps 14, 14 from below so as to be slid thereon.

In the above configuration, in the initial state, the hydraulic cylinder 12 is in a retracted state, and the push rod 10 as an elevating link is lowered as shown by the dotted line in FIG. are guided by the fork portion 9, and each clamp hook 15 is in a position retracted into the corresponding slit 5.

Therefore, the lower end of the constant velocity joint 3, which is a workpiece of low rigidity, is engaged with the hook flange 4 of the set frame 2, and the upper end is brought into contact with the set frame 2, and in this state, a control mechanism (not shown) When the hydraulic cylinder 12 is moved to the extended state via the push rod 11, the push rod 1
0 rises, and the link clamps 14, 14 are guided by the fork part 9 via the pin 13, and the upper surface of the curved part comes into contact with the surface of the control plate 21, pivoting outward while sliding, and the tip ends. The clamp hooks 15, 15 advance guided by the slits 5, 5, and the lower surfaces of their tips come into contact with the upper end of the workpiece 3, as shown by the solid line, and the hydraulic cylinder 12
As the workpiece 3 expands, a pressing force is applied using the abutment part to the control plate 21 as a fulcrum, and the workpiece 3
Appears a clamp state for.

Then, when the hydraulic cylinder 12 moves the link clamps 14, 14 through the push rod 10 beyond the set stroke, the contact portion between the clamp hooks 15, 15 and the workpiece 3 becomes the fulcrum, and the pin 13 becomes the point of force, controlling the The contact point of the plate 21 becomes a point of action, and the link clamp 1
4 and 14 act as levers to apply a lifting force to the control plate 21, and as a result, the elastic modulus of the rubber plate 20 is reduced in advance with a force weaker than the force that imparts clamp strain to the workpiece 3, as described above. With this setting, it functions to automatically avoid applying excessive clamping force to the workpiece 3 due to elastic contraction due to the overstroke of the link clamps 14, 14 between the cap 18 and the workpiece 3.

During this operation, since the rubber plate 20 is interposed between the control plate 21 and the cap 18, it will not wear out as an indirect attachment.

During this time, work 3 is not set enough or
If the posture is incorrect, the clamp hooks 15, 15
is caught on the workpiece 3, and the push rod 1
0, that is, the fork part 9 does not rise, or the clamp hooks 15, 15 enter the inside of the cage 3 and slip, and the fork part 9 rises too much from the cap 18. Immediately visually check the clamp failure. It is possible to identify problems and promptly deal with appropriate situations.

In this manner, the workpiece 3 is processed in a predetermined manner, such as grinding, while being properly clamped.

Further, in order to remove the workpiece 3 after processing, it is sufficient to perform an operation opposite to the above-mentioned process.

It goes without saying that the embodiments of this invention are not limited to the above-described embodiments; for example, the lifting link may be connected to a crank or the like with a normal bar link instead of a push rod, or the bullet may be connected with a spring instead of rubber. Alternatively, various methods such as using an air mat or the like can be adopted.

Of course, the target workpiece is not limited to the constant velocity joint cage, but can be applied to various other low-rigidity workpieces.

<Effects of the invention> As described above, according to this invention, an elevating link is provided for a set frame that clamps a low-rigidity work, and the link clamp, which is pivotally supported by a pin on the elevating link, is moved to the end of the work. The control plate, which is provided on the set frame through the gap between the link clamp and the link clamp, can freely come into contact with the link clamp, and has an elastic modulus that decreases during overstroke, which causes clamping strain on the workpiece. This is a process in which the link clamp applies clamping force to the end of the workpiece with low rigidity due to the action of the lifting link. If the stroke exceeds the set stroke or the workpiece is larger than the predetermined size, a reaction force is applied to the control plate, and as a result, the bullet is reduced due to overstroke. An excellent effect is achieved in that no excessive clamping force is applied, and therefore no clamping strain occurs on the workpiece, and machining accuracy is not adversely affected.

In addition, since the link clamp operates by being supported by a pin on the lifting link, if the link clamp is not set properly for the workpiece, the lifting link may not operate or the link clamp or the lifting link may overrun. Since it is visible, it also has the effect of making it easier to confirm correct operation.

Furthermore, the structure is simple, easy to manufacture, low cost, little breakdown, almost no maintenance required, easy handling, and no skill required. It also has the advantage of durability because it does not wear out.

[Brief explanation of the drawing]

The drawing shows one embodiment of this invention,
FIG. 1 is a plan view, FIG. 2 is a partial side view, and FIG. 3 is a sectional view of FIG. 1. 3...Work, 2...Set frame, 10...Elevating link, 13...Pin, 14...Link clamp, 1
...clamp device, 5... gap, 21... control plate, 20... ammunition machine.

Claims (1)

[Scope of utility model registration request] In an apparatus for clamping a low-rigidity work between a link clamp supported by a pin on an elevating link provided along a set frame for a low-rigidity work, and the set frame, the link clamp is mounted on an upper part of the set frame. The control plate is allowed to come into contact with the link clamp through a gap that allows the link clamp to move forward and backward, and the link clamp is attached via an elastic modulus that decreases during overstroke that causes clamp strain. A clamp device featuring: