JPH02122941A - Manufacture of monolithic armature lever - Google Patents

Abstract

PURPOSE:To form a monolithic armature lever with high accuracy by subjecting an armature and a lever to specific cold forging press and carburizing processes. CONSTITUTION:Pilot holes 2 and lower holes 3 for determining the shearing of a surface for attracting an armature section are punched by pressing a base material 1 such as pure iron or silicon steel plate which is larger by about 0.05 to 0.1mm than the thickness of a completed monolithic armature lever. After this, window holes 4 are punched symmetrically at the upper and lower sides. Next the squeezing part 5 of a lever section is worked. Then a contour is cut 8 with a die, and only an armature section is half cut with a die on the base material to prevent the deformation and bending of the lever section. Finally, a monolithic armature lever which is half cut with a die on the base material is cut using a removal device in such a manner that its upper and lower metal plate sections are removed. After this pressing process, the whole pressed work is carburized and hardened, then is pressed again and its oxide film generated by the carburizing and hardening process is removed by barreling.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field 1] The present invention relates to a method of manufacturing an armature lever for moving a wire back and forth in a serial don't head.

[Prior Art] Conventionally, as shown in Fig. 7, armature A-1 and lever B
After separately press-cutting the armature A-1,
Step 1 is carburizing and plating to increase surface hardness. After that, armature A-1, 2 pieces and lever B-1
The positions of the three sheets are determined by the armature axis C, and the three sheets are stacked. After that, the laminated parts were welded so that they would not come off due to impact, and the armature lever was manufactured.6 Also, as shown in Figure 8, a thin groove was machined in the armature A-2, which was machined by pressing or drawing and cutting. Lever B- in the groove
2 was inserted and the brazing was fixed by machining.

[Problems to be Solved by the Invention] The armature lever is manufactured by lamination welding. First, the armature A-1 and the lever B-1 are laminated by the armature axis C. However, the manufacturing process of the hole position and hole diameter of the armature and lever is difficult. Due to the above tolerance variations, mutual misalignment occurred, and the armature shaft was scraped or bent during lamination processing, or the armature shaft did not fit properly, resulting in looseness. Also, if a gap is created between the armature shaft and the hole in the armature or lever during welding, the welding heat will not be transmitted and the joint force will not be produced, and conversely, if the armature shaft is driven too hard, defects such as the lever breaking will occur. was. In addition, the armature lever with brazing is machined using a milling cutter or wire electric discharge machine when machining a narrow groove on the armature A-2, but the machining time is extremely long and the manufacturing cost, including cutting paring, is extremely high. The problem was that it was expensive. Therefore, the present invention is.

In order to solve these conventional problems, the aim is to manufacture the armature and lever with high precision and at low cost by cold forging press processing.

[Means for Solving the Problems 1] In order to solve the above problems and problems, the method for manufacturing an integral armature lever of the present invention provides a method for manufacturing an armature lever using pure iron, silicon steel, etc. , a single length material such as silicon steel is used, and the total thickness is 1. o
A base material of 2.0 mm to 2.0 mm is cold forged to a thickness of 0.15 mm to 0.2 mm using a special shape punch, and the outer shape is half-extracted to prevent the lever part from deforming. Take it out from the base material and carburize it to a hardness of Hv50.
It is characterized by raising the temperature to about 0 to 700 Hv, removing oxidized scale and press burrs with barrel processing, and applying rust prevention plating.

[Examples] Examples of the present invention will be described below based on the drawings. As shown in Figure 1, from the complete thickness of the integrated armature lever,
Base material 1 of pure iron, silicon steel plate, etc. about 0.05 to 0.1 mm thick
By pressing, the pilot hole 2 and the pilot hole 3 for producing shear on the armature suction surface are extracted. After that, the window hole 4 for crushing the lever part is removed vertically symmetrically. This is done in order to balance the crushing force when crushing the lever part in the next process, by machining the upper and lower parts. Next, the lever portion (1) 5 is processed. As shown in Figure 2, the punch of this Tsubushi (1) is integrated so as to crush the top and bottom with the same size, and the material is used as a base material! 4. To improve the flow and push the minced meat outward, make slopes of 0.5° to 20° in three directions toward the outer full direction of the Tsubushi punch. In addition, when the crushing force is 0, the crushing thickness is set to about 30% of the base material thickness in order to reduce the concentrated load on the punch. After that, the lever portion (2) 6 is carried out.

This Tsubushi Punch flattens the lever part and pushes the excess meat outward. As shown in FIG. 3, taper the punch by about 0.5° to 2.0° on the left and right sides, and crush the punch to a thickness of about 0.1 mm from the punch (1). Next, use the knob (3) 7 to completely finish the step between the armature and lever. At this time, the armature part and lever part are finished with a hammer at the same time so that variations in the total thickness of the base material can be absorbed at the same time. Then, external shape removal 8 is carried out, and as shown in FIG. 4, only half of the armature portion is removed from the base material, thereby preventing deformation, bending, etc. of the lever portion. Finally, the integral armature lever, which has been partially removed from the base material, is removed separately from the top and bottom using the removal device shown in FIG. After this series of cold forming presses, carburizing and quenching is performed to increase hardness, and the press is burred and the oxide film produced during carburizing and quenching is removed from the barrel. Then, plating is applied as a rust preventive treatment to complete the integral armature lever 101 shown in FIG.

[Effects of the invention 1 The effects of the invention are as follows.

(1) The armature and lever are laminated and welding is completely unnecessary.6 (2) Quality and accuracy are greatly improved.

(3) Manufacturing costs are extremely low because it can be completed by just cold forging and press processing.

[Brief explanation of drawings]

FIG. 1 is a press working plan view of the integral armature lever of the present invention. FIG. 2 is a plan view and a side view of the punch for whelks (1) of the present invention. FIG. 3 is a plan view, a side view, and a partial cross-sectional view of a punch for whelks (2) according to the present invention. FIG. 4 is a sectional view of the present invention in a half-extracted state. FIG. 5 is a sectional view of the integral armature lever sheathing device of the present invention. FIG. 6 is an external perspective view of an integral armature lever that is a completed product of the present invention. FIG. 7 is an external perspective view of a conventional laminated welded armature lever. FIG. 8 is an external perspective view of a conventional brazed armature lever.・Base metal・Pilot hole・Prepared hole・Window hole・Tsubushi (1) 6 ・ 7 ・ 101 ・ A-1・ A-2・ B-1・ C・ ・Tsubushi (2) ・Tsubushi (3) ・Outline cutting -1 armature lever armature armature lever lever armature shaft Applicant Seiko Epson Co., Ltd. Agent Patent attorney Kizobe Suzuki (and 1 other person) Figure (C) Figure 2 Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] In manufacturing armature levers using pure iron, silicon steel, etc., we use pure iron hoop materials, single-length materials such as silicon steel, and press a base material with a total thickness of 1.0 mm to 2.0 mm using a special process. With a shape punch, 0.15mm to 0.2
It is cold-forged to a thickness of mm, half-extracted to prevent the lever part from deforming, removed from the base metal using a special shearing device, carburized to increase the hardness to about Hv500 to Hv700, and barrel-processed. A method for manufacturing an integral armature lever, which is characterized by removing oxide scale and press burrs, and applying rust-preventing plating.