JPS6352912A - Blade replacing method in slitter - Google Patents

Abstract

PURPOSE:To enhance the shearing accuracy by giving the coefficient of thermal expansion of a horizontal revolving shaft a smaller value than that of a ring- shaped cutter, fitting or dismantling the revolving shaft to/from the ring-shaped cutter in hot condition, and eliminating possible play of the cutter with an arbor with easy replacement of cutter. CONSTITUTION:When an arbor 4 is separated from a set of stands 2, 3 and placed in a heated atmosphere, a shearing ring-shaped cutter 5 fitted on the arbor 4 is heated to the same temp. as the arbor 4. Accordingly the outside dia. of the arbor 4 and the inside dia. of the cutter 5 will expand to cause the cutter ins. dia. to become larger than the arbor outs. dia. Therefore the cutter can be removed from the arbor 4 by moving in the axial direction. Then a new cutter 5 in hot atmosphere is fitted on the arbor 4 for replacement of cutter, followed by transfer from the hot atmosphere to the atmospheric, and when room temp. is attained, the arbor outs. dia. and cutter ins. dia. contract, when the two and fitted without play because the arbor 4 has a greater rate of contraction than the cutter 5. This is mounted on the abovementioned set of stands 2, 3, and the upper and lower cutters are mated with each other and rotated oppositely. Now operations are performed.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a method for assembling blades in a slitter for manufacturing strip plates for lead frames and the like.

``Prior Art'' As the demand for WII for lead frames increases, the field of slitting work for vertically cutting coils is expanding, and there is an urgent need to improve productivity. In this slitting work,
The problem with production is that it takes a lot of time to change the blade of the cutter due to changing the shear width. Therefore, either the main body that has been changed in advance is inserted into the line main body within a short time to increase the effect, or the time required for changing the blade itself is not shortened.

In addition, this blade changing technology relies heavily on the know-how of the operator, and is beyond the scope of being able to be automatically automated in advance or theoretically. It is difficult to remove, difficult to improve shearing accuracy, and tends to cause cracks due to vertical cutting.

[Problems to be solved by the invention] Is the present invention easy to change the blade, removes looseness between the aperture and the blade after changing the blade, and achieves shearing accuracy? The purpose is to improve.

``Meaning for Solving Problems'' The present invention has a pair of upper and lower horizontal rotation shafts attached to a set of stands provided on the machine base, which can be attached and detached from the stand, and each has an annular shearing blade on the same axis. In the slitter fitted in corresponding positions, the coefficient of thermal expansion of the horizontal rotation shaft is smaller than the coefficient of thermal expansion of the annular blade, and the rotation shaft and the annular blade separated from the stand are connected to each other. It is constructed using a blade changing method in a slitter that is characterized by being attached and detached in a heated state.

"Effect J" Therefore, when the horizontal rotation 1 [11 (arbor) 4 is separated from a set of stands 2.3 and inserted into a heated atmosphere, the arbor 4 and the shearing annular blade fitted therein are separated. 5
The outer diameter of the arbor 4 and the inner diameter of the blade 5 expand when heated to the same temperature, but the inner diameter of the blade 5 becomes larger than the outer diameter of the arbor 4. In this state, the blade 5 can be separated from the arbor 4 by sliding it in the axial direction. Then, a new blade 5 (the inner diameter of the new blade is the same as the inner diameter of the removed old blade) in the above-mentioned thermal atmosphere is fitted into the arbor 4 to change the blade, and the new blade is moved from the above-mentioned thermal atmosphere to the atmosphere and the temperature increases. When the temperature is lowered to room temperature, the outer diameter of the arbor and the inner diameter of the blade contract, and since the shrinkage rate of the inner diameter of the blade 5 is greater than that of the outer diameter of the arbor 4, the two fit together with no gap. In this state, it is installed on the above-mentioned pair of stands 2.3, the upper and lower blades 5.5 are made to correspond to each other, and they are moved in opposite directions [gl
〇 "Example" A machine stand 1 is installed on the floor 6. A set of stands 2.3 is installed on the top surface of the L1 machine stand 1, and one stand 3 is attached as shown in Fig. 1. The stand is slidably supported from the solid line position to the imaginary line position and the stand is 2.3 m.
l for ¥j! 1fRJ.

A horizontal rotation shaft (arbor) 4.4 is vertically and removably supported on this set of stands 2.3iji. A plurality of annular shearing blades 5 are fitted to these rotation shafts 4.4 through collars 7, respectively.
．． The digits of 5 are made to correspond as shown in Figure 1. The arbor 4 has a convex surface 8 at one end and a concave conical surface 9 at the other end.
! 1' surface 9 is fitted into the formation protrusion 9 at the tip of the drive shaft 10 which is pivotally supported on the other stand 2, and the convex surface 8 at one end is fitted into the concave conical bearing 11 provided on one stand 3. A slitter for manufacturing a lead frame strip can be formed by rotating the upper and lower drive shafts 10.10 in opposite directions. When the arbor 4 is made of cemented carbide, such as Igetalloy (registered trademark), and the blade 5 and collar 7 are made of carbon steel or stainless steel, the thermal expansion coefficients and other properties of the arbor 4 and the blade 5 are shown in Table 1. That's right.

In Table 1, the thermal expansion coefficient of the cemented carbide arbor 4 is 5 to 6 (XI
O/'C), and the coefficient of thermal expansion of the carbon steel blade 5 is 10~
12 (XI O/”C), stainless steel blade 5
So, it is 17~18 (XIO/"C'). Now, if the arbor 4, which has an outside diameter of 100 at room temperature, is heated to 100°C and the coefficient of thermal expansion is 5 x 10/"C, its outside diameter will be as follows. Expanding.

On the other hand, the coefficient of thermal expansion of blade 5 with an inner diameter of 100 at room temperature is 10X.
1 g7c, the same inner diameter when heated at 100°C is Q
, 0°1 between the arbor 4 and the blade 5 to enlarge the lsm
A gap of -0.05=0.05fi is created, and in this state, it is easy to slide the blade 5 into the aperture 4. Then, when it is allowed to cool and returned to room temperature, the outer diameter of the arbor 4 and the inner diameter of the blade 5 match, and the gap disappears. When replacing the blade 5 after use, it can be replaced with a new blade 5 by performing the reverse operation to that described above. Since the blade changing work involves heating work, it is difficult to do it with bare hands, so it is better to do it with a tool or with a robot or other self-axis control device. 12 is a universal joint for the drive shaft 10, 13 is an interlocking gear box, 14 is a speed reducer, 15Vi is a prime mover, 16 is a stand interval adjustment handle, and 17 is a tightening nut for the blade 5 and collar 7.

"Effect" Since the present invention uses the above-mentioned blade changing method, the arbor 4 and the blade 5
Not only can the shearing accuracy of the slitter be improved by eliminating the gap between the blades and the arbor 4, but also the blade changing operation of removing and fitting the blade 5 from the arbor 4 can be carried out easily.

[Brief explanation of the drawing]

FIG. 1 is a front view showing a slitter using the blade changing method of the present invention, and FIG. 2 is a perspective view of an arbor, an annular shearing blade, and a collar. 1. Machine base, 2.3. Stand, 4. Horizontal rotation axis,
5. Annular blade for shearing.

Claims (1)

[Claims] (1) In a slitter, in which a set of upper and lower horizontal rotation shafts is installed on a set of stands provided on the machine base, and a set of upper and lower horizontal rotation shafts is removably attached to the stand, and annular shearing blades are fitted on the same shafts at corresponding positions. , the coefficient of thermal expansion of the horizontal rotation shaft is smaller than the coefficient of thermal expansion of the annular blade, and the rotation shaft detached from the stand and the annular blade are attached and detached in a heated state. Blade changing method for slitting machines.