JP3830471B2 - Double-sided milling machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a double-sided side milling machine. More specifically, the present invention relates to a double-sided side milling machine for machining a plate-like workpiece with high accuracy.
[0002]
[Prior art]
When cutting a workpiece with a milling machine, various clamps have been devised in order to eliminate chatter of the workpiece or to fix an irregularly shaped workpiece. Among these clamps, as a special one, there is a clamp described in JP-A-57-83331 for a clamp for fixing a trumpet-shaped workpiece, which is special for a lateral clamp for fixing a block-shaped workpiece. There are those described in Japanese Utility Model Publication No. 54-90698.
[0003]
[Patent Document 1]
JP-A-57-83331 [Patent Document 2]
Japanese Patent Laid-Open No. 54-90698
[Problems to be solved by the invention]
However, each clamp fixes a thick workpiece having a certain volume.
In contrast to what is exemplified above, the situation is different when cutting plate-like workpieces. However, if one side of a flat workpiece is cut, the workpiece may be laid and clamped, so that even if the shape of the clamp needs to be devised, the workpiece is hardly chattered.
[0005]
However, when cutting from both the front and back sides with a plate-shaped workpiece standing, it is necessary to devise not only the chattering of the workpiece itself but also the bending of the clamping jig finished to be thinner than the workpiece and the elimination of chattering. This is because when cutting both sides of a plate-shaped workpiece at the same time, if the clamping jig is thicker than the workpiece finish dimension, the workpiece cannot be cut, so the thickness of the clamping jig is greater than the workpiece finishing thickness. This is because in this case, the clamping jig is likely to bend and chatter, so that the finished dimensions of the workpiece are not accurate.
[0006]
In view of the above circumstances, an object of the present invention is to provide a double-sided side milling machine capable of realizing high dimensional accuracy and surface roughness even when a plate-like workpiece is cut from both front and back surfaces.
[0007]
[Means for Solving the Problems]
A double-headed side milling machine according to claim 1 is a machining table on which a workpiece is placed and which can be moved back and forth, a pair of heads which are provided on the left and right of the machining table and which are movable in the left and right directions , and a clamp mechanism for fixing a plate-like workpiece. in double-ended side milling with bets, the clamping mechanism is secured on the work table, and a lower jig for mounting in an upright position the workpiece, flat pressing a workpiece placed on the lower jig from above An upper clamp cylinder for raising and lowering the upper jig, guide plates in contact with the front and back sides of the upper jig at both ends in the front-rear direction of the upper jig, and the upper jig from the left and right consists of a side clamp pinching, the side clamp, attached to the cylinder body to the frame, and side clamp cylinder with its rod on said jig-side, mounted on the rod of each side clamp cylinder A clamping plate which is characterized by comprising a clamping spring biasing the clamp direction respective clamping plate on the rod.
[ 0008]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of the present invention will be described with reference to the drawings.
Figure 8 is an overall front view of a double head sides milling machine according to the present onset bright. FIG. 9 is an overall plan view of FIG. First, the basic configuration of the double-sided side milling machine according to the present invention will be described.
8 and 9, reference numeral 1 denotes a base. On the upper surface of the base 1, a processing table 2 is provided so as to be movable forward and backward (vertical direction in FIG. 9) with respect to the base 1. On the processing table 2, a lower jig 3 for placing the workpiece W is provided. Above the lower jig 3, an upper clamp cylinder 5 that moves back and forth together with the processing table 2 is provided. The upper clamp cylinder 5 has a rod disposed vertically downward. An upper jig 6 is provided at the tip of the rod.
For this reason, if the clamping cylinder 5 is extended, the workpiece W is sandwiched between the lower jig 3 and the upper jig 6, so that the workpiece W can be fixed to the processing table 2. Moreover, if the work table 2 is moved back and forth, the work W can be moved back and forth together with the work table 2 while the work W is sandwiched between the upper jig 6 and the lower jig 3.
[0009]
On the upper surface of the base 1, a pair of rails 4, 4 are provided on the left and right sides of the processing table 2 at right angles to the central axis of the processing table 2.
The headstocks 11 and 11 of the pair of left and right heads 10 and 10 are respectively attached to the upper surfaces of the pair of left and right rails 4 and 4. Each head stock 11 is movable on the rail 4 from side to side.
[0010]
A pair of main shafts 12 and 12 are rotatably supported on the pair of main shaft bases 11 and 11, respectively, and the pair of main shafts 12 and 12 are provided horizontally so that their axis centers coincide with each other. Yes. A cutter 15 is attached to one end portion of the pair of main shafts 12 and 12, respectively, and the other end portion of each main shaft 12 is a motor provided on the upper portion of the head stock 11 by a belt or the like, for example. 13 main shafts are connected.
For this reason, if the motor 13 is driven, the main shaft 12 rotates and the cutter 15 rotates.
[0011]
According to both the head side milling on reporting, attaching the workpiece W to the work table 2 is moved toward the amount corresponding pair of heads 10, 10 of the amount of processing the workpiece W to the work table 2. Then, by driving the motor 13 to rotate the cutter 15 and sending the workpiece W in the direction of the cutter 15 by the processing table 2, the front and back surfaces of the workpiece W can be cut at once by the cutter 15.
[0012]
Next, the clamp mechanism that is a feature of the present invention will be described.
FIG. 1 is a longitudinal sectional view of an essential part of a double-sided side milling machine according to an embodiment of the present invention. FIG. 2 is a cross-sectional view around the clamping mechanism shown in FIG. FIG. 3 is a longitudinal sectional view around the clamping mechanism shown in FIG. FIG. 4 is an enlarged view of one side of the clamp mechanism. FIG. 5 is an explanatory view of the cutting operation in the double-sided side milling machine shown in FIG.
As shown in FIG. 1, the lower jig 3 on the processing table 2 is composed of a base part 3 a having a substantially triangular cross-sectional shape and a support part 3 b in which only the central upper surface is narrow and protrudes upward. The width of the support portion 3b is made thinner than the finished dimension of the workpiece W to be cut. In other words, several types of lower jigs 3 are prepared according to the workpiece, and the lower jig 3 having the support portion 3b narrower than the finished dimension is selected and used.
[0013]
The upper jig 6 is a jig on a flat plate. The upper jig 6 is thinner than the finished dimension of the workpiece W. That is, when the plate-like workpiece is cut from both the front and back surfaces and processed entirely, the upper jig 6 interferes with the cutter 15 if the upper jig 6 is thicker than the workpiece W. Several types of the upper jig 6 are prepared according to the workpiece, and one having a thickness smaller than the finished dimension is selected and used.
[0014]
The cylinder body 5a of the upper clamp cylinder 5 is attached to the mount 7, and a jig fitting 5c is attached to the lower end of the rod 5b. The upper jig 6 is attached to the upper clamp cylinder 5 by the jig mounting bracket 5c, and is moved up and down by the expansion and contraction of the upper clamp cylinder 5.
With the above configuration, when the plate-like workpiece W is stood on the lower jig 3 and the upper jig 6 is lowered from above, the workpiece W can be clamped between the upper and lower jigs 3 and 6 once. it can. In FIG. 1, the workpiece indicated by a one-dot chain line is a thin plate, and the workpiece indicated by a two-dot chain line is a thick plate.
[0015]
As shown in FIGS. 1 and 2, side clamp cylinders 21 and 22 are attached to the left and right sides of the gantry 7, respectively. That is, the cylinder bodies 21a and 22a are horizontally fixed to the gantry 7, and the rods 21b and 22b are arranged inward. Square clamp plates 23 and 24 are attached to the tips of these rods 21b and 22b, respectively, in side view . Therefore, when the side clamp cylinders 21 and 22 are extended, the flat upper jig 6 can be sandwiched from the left and right sides by the two clamp plates 23 and 24. In this case, bending of the upper jig 6 and chattering can be prevented.
Further, when the side clamp cylinders 21 and 22 are contracted, the two clamp plates 23 and 24 are separated from the upper jig 6, so that the upper jig 6 can be moved up and down freely. In FIG. 2, the upper clamp plate 23 contracts the side clamp cylinder 21 and is separated from the workpiece 6, and the lower clamp plate 24 extends the side clamp cylinder 22 and contacts the workpiece 6. Indicates the state.
[0016]
As shown in FIGS. 2 and 3, guide plates 31 are provided so as to be in contact with both ends of the upper jig 6 in the front-rear direction. The guide plate 31 is a set in contact with the upper jig 6 from the front side and that from the back side, and is fixed to an appropriate position on the gantry 7. When the upper jig 6 is replaced with one having a different thickness, the guide plate 31 is also replaced with a different gap between which the upper jig 6 is sandwiched.
The guide plate 31 accurately guides the upper jig 6 to a fixed position when the upper jig 6 descends from above, so that the workpiece W can be reliably clamped even with a thin upper jig 6 or a thin workpiece. Can do.
[0017]
The details around the clamp plate 23 will be described with reference to FIG. Since the structure around the right clamp plate 24 is the same, it is represented by the clamp plate 23.
A push rod 21c is fixed to the tip of the rod 21b of the side clamp cylinder 21. The push rod 21c includes a large diameter portion 21e and a small diameter portion 21f, and a clamp plate 23 is fitted to the small diameter portion 21f via a bush 26. 21d is a stopper, which is screwed to the tip of the small diameter portion 21f so that the clamp plate 23 does not come off from the small diameter portion 21f. The bush 26 contains a lubricant.
A spring 25 is inserted around the outer periphery of the large diameter portion 21e of the push rod 21c. One end of the spring 25 is in contact with the inner wall of the gantry 7 and the other end is biased so as to push the clamp plate 23 inward.
Although omitted in FIG. 4, a spring 26 is externally attached to the rod 22b of the right side clamp cylinder 22 as shown in FIG. 1 in a simplified manner. 7, and the other end is biased to push the clamp plate 24 inward.
[0018]
FIG. 4 shows a state in which the rod 21b of the side clamp cylinder 21 is extended. In this state, the large diameter portion 21e of the push rod 21C pushes the back surface of the clamp plate 23. In this state, the upper jig 6 can be strongly clamped by the cylinder outputs of the left and right side clamp cylinders 21 and 22.
On the other hand, when the rod 21b of the side clamp cylinder 21 is reduced, the distance S1 between the large-diameter portion 21e and the inner wall of the mount 7 and the distance S2 between the fitting 21d and the end face of the clamp plate 23 are reduced. can do. When the left and right side clamp cylinders 21 and 22 operate in this manner, the upper jig 6 can be unclamped.
[0019]
Further, with the above configuration, the pair of left and right springs 25 and 26 can lightly contact the clamp plates 23 and 24 from the left and right with respect to the upper jig 6. For this reason, there are the following advantages.
That is, during processing, the workpiece W is changed one after another, and clamping and unclamping are repeated. However, when starting the clamp after unclamping, the starting positions of the two side clamp cylinders 21 and 22 are misaligned. There is. In this case, if the upper jig 6 is to be clamped only by the side clamp cylinders 21 and 22, the upper jig 6 is pushed to one side and the workpiece W cannot be clamped. However, if the springs 25 and 26 are present, the two clamp plates 23 and 24 can be brought into contact with the upper jig 6 and held at the center in advance while the side clamp cylinders 21 and 22 are in operation. The tool 6 can be reliably positioned at the clamp position.
[0020]
As shown in FIG. 5, scrapers 27 and 27 are attached to the lower surfaces of the clamp plates 23 and 24, and covers 28 and 28 are also attached. For this reason, there are the following advantages.
That is, during processing, both the front and back surfaces of the workpiece W are cut by the cutter 15, and the swarf scatters upward and adheres to the surface of the upper jig 6. However, after the processing is finished, the clamps by the side clamp cylinders 21 and 22 are released, and the upper jig 6 is lightly held only by the springs 25 and 26, and the upper clamp cylinder 5 (see FIG. 1) is used. When 6 is pulled out, the scraps 27 and 27 remove chips adhering to the surface of the upper jig 6. If it does in this way, when using the upper jig | tool 6 next, the effort of cleaning can be skipped.
The cover 28 can prevent chips from adhering to the springs 25 and 26.
[0021]
According to the clamp Organization of this embodiment, advantageous effects below.
(1) When the side clamp cylinders 21 and 22 are extended and the upper jig 6 is sandwiched between the clamp plates 23 and 24, the upper jig 6 does not bend even if it is strongly pressed by the upper clamp cylinder 5, and the work W is strengthened. Can be clamped. Moreover, chatter does not occur during processing. Therefore, cutting with high dimensional accuracy and high surface roughness is possible. Further, as described above, since the upper jig 6 is not bent, the thin upper jig 6 can be used, so that the thin workpiece W can be processed. Therefore, it is possible to perform double-side processing of a thin workpiece that has been extremely difficult in the past.
(2) When the side clamp cylinders 21 and 22 are contracted and the clamp plates 23 and 24 are separated from the upper jig 6, the upper jig 6 can be freely moved. Can be moved up and down.
(3) During the clamping operation, the side clamp cylinders 21 and 22 are extended. Before clamping with the cylinder power, the clamp plates 23 and 24 are pushed out by the springs 25 and 26, and the upper jig 6 is held at the center position. Hold and position from both sides.
Next, when the cylinders 21 and 22 are extended by the side clamps, the clamp plates 23 and 24 strongly hold the upper jig by the pressure.
As described above, since the upper jig 6 is first positioned by the springs 25 and 26, the upper jig 6 must be in a fixed position even if the two side clamp cylinders 21 and 22 are not simultaneously started. The workpiece W can be clamped.
[0022]
Next, another embodiment of the present invention will be described.
FIG. 6 is a longitudinal sectional view of a main part of a double-sided side milling machine according to another embodiment. FIG. 7 is a cross-sectional view around the clamping mechanism shown in FIG.
In this embodiment, one of the pair of clamp plates that should sandwich the upper jig 6 is fixed. That is, the clamp plate 41 on the fixed side is fixed to the inner protruding portion 42 formed on a part of the gantry 7 with a bolt or the like. The other moving-side clamp plate 24 is connected to a side clamp cylinder 22 similar to that of the above-described embodiment, and advances and retreats.
In FIG. 6, the right side may be fixed, and the left side may be movable.
Also in this embodiment, the upper jig 6 can be clamped and unclamped by expanding and contracting the side clamp cylinder on the moving side, so that double-sided processing of a plate-like workpiece can be performed with high accuracy.
[0023]
The double-sided side milling machine of the present invention is suitable for double-sided cutting of a thin workpiece, but can also be applied to workpieces other than thin workpieces.
[0024]
【The invention's effect】
The present invention has the following effects.
together to clamp the plate-shaped workpiece in a) the upper jig and lower jig from above and below, because the Ru with scissors a flat upper jig from the left and right, the deflection and chatter Ueji tool will not occur. Therefore, work can also cut without causing chatter, Shinano cutting both surfaces of a work can be finished high et dimension accuracy and surface roughness.
Since b) clamp plate sandwiching the upper jig in terms, it is possible to eliminate the deflection and chatter Ueji tool.
c) When moving the side clamp cylinder back and forth, even if there is a deviation in the starting position, the clamp plate is held at a fixed position by holding it with a light spring first. I can .
[ Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of an essential part of a double-sided side milling machine according to an embodiment of the present invention.
FIG. 2 is a transverse cross-sectional view around the clamp mechanism shown in FIG.
FIG. 3 is a longitudinal sectional view around the clamp mechanism shown in FIG. 1;
FIG. 4 is an enlarged view of one side of the clamp mechanism.
FIG. 5 is an explanatory diagram of a cutting operation on the double-sided side milling machine shown in FIG. 1;
FIG. 6 is a longitudinal sectional view of an essential part of a double-sided side milling machine according to another embodiment of the present invention.
7 is a cross-sectional view around the clamp mechanism shown in FIG. 6. FIG.
8 is an overall front view of a double-sided side milling machine. FIG. 9 is an overall plan view of a double-sided side milling machine.
[Explanation of symbols]
3 Lower jig 5 Upper clamp cylinder 6 Upper jig
2 1 Side Clamp Cylinder 22 Side Clamp Cylinder 23 Clamp Plate 24 Clamp Plate 25 Spring 26 Spring 31 Guide Plate 32 Guide Plate

Claims (1)

And movable work table around the workpiece placed, and movable pair of heads in the lateral direction is provided on the left and right of the work base, in double-ended side milling machine and a clamping mechanism for fixing the plate-shaped workpiece,
The clamping mechanism is
And lower jig to the fixed to the worktable on, placing in the upright said workpiece,
A flat upper jig for pressing the workpiece placed on the lower jig from above;
An upper clamp cylinder for raising and lowering the upper jig;
At both ends in the front-rear direction of the upper jig, guide plates in contact with the front side and back side of the upper jig,
It consists of side clamps that sandwich the upper jig from the left and right,
The side clamps
A side clamp cylinder with the cylinder body attached to the mount and the rod facing the upper jig side;
A clamp plate attached to the rod of each side clamp cylinder;
A double-headed side milling machine comprising: a clamp spring for urging each clamp plate in the clamp direction on the rod .

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