JPS609537A - Manufacture of thin plate drum having tooth form on circumference - Google Patents

Abstract

PURPOSE:To obtain a thin plate drum having tooth form of improved accuracy by providing tooth form parallel to the axis of a boss at the center of spokes formed on a thin plate material by press work and forming both end faces of the tooth form to a gear. CONSTITUTION:In a preparatory process, tooth form 5 is provided to establish groove wall faces by uneven system 10 provided in the width from subcircular line (b) of a circular material to the circumference (d) of the material. Then, in a rough form working process, above-mentioned tooth form 5 is formed parallel to the direction of axis. At this time, the width is made larger than desired tooth width and each tooth form 5 is made parallel to each other. In succeeding main process 3, the spoke 7 side tooth form 5 other than desired tooth width is flattened to make it a part of the spoke part 7. At the same time, a right angle bend line C is formed at the boundary of the spoke part 7 and tooth form 5 and accuracy of the tooth form 5 is improved. The work passed through the process 3 is pressed in or inserted into a finishing die 19 that has intermediate part of a correcting part made to strictly selected female tooth form and upper receiving part 17 and lower sending out part 18. Thus, accuracy of the shape of end face of the tooth form 5 on the side connecting to the tooth form 5 and spoke part 7 is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is directed to a method of manufacturing a sheet metal drum in which tooth patterns are provided on the circumference.

Drums with tooth patterns on the circumference are widely used as pulleys, gears, brake drums, clutch drums, etc.

This drum has a boss in the center that engages with the shaft, and the outer surface of the circumference, which is parallel or approximately parallel to the axial direction, has irregularities at equal intervals parallel to the axial direction or at a certain angle. It has a tooth pattern. Hereinafter, this article will be referred to as a toothed pulley.

The above toothed pulley has not existed for a long time,
It was developed in recent years in response to improvements in press working technology and demands for lighter weight and simpler mechanisms.

However, since the sterilized pulley is made of a soft iron plate, the type of processing is exclusively press work. Conventionally, the manufacturing method for these shapes was to press the material to form a circumference parallel to the axis, and to form a circular planar material from a shallow dish shape to a deep dish shape at the same time as a tooth mold. This is done in combination with other tasks. Toothed pulleys formed through such multi-step press work cannot have high precision in the tooth shape itself, and the tooth shape is only used as a resistor when transmitting rotation. Therefore, it was considered impossible to use gears as a purpose.

Further, as described above, the multi-stage pressing operation causes a change in the material at the pressed location. That is, the hardening phenomenon of the material occurs due to the bending process, which results in damage and deformation of the resulting product during use. In this way, the purpose of use of the toothed pulley provided around the circumference is limited to simply being used as a resistor to prevent slipping.

Therefore, the requirements for a pulley with a tooth pattern on the circumference are:
The first condition is to create a highly accurate perfect circle and a highly accurate tooth profile around the circumference, and then prevention of material changes due to machining and simplification of the 1st and 1st machining processes are required. Ru.

By satisfying all these requirements, the field of use as a toothed pulley will be expanded.

This invention has the basic technical loyalty to the invention of Patent No. SA+@T3C+691 filed in 1982, which was filed by the same applicant as the applicant of this invention. It was developed to be able to construct a high-quality tooth profile, and technical thought has been put into the process, especially in the preparation process and the main machining process.

In this invention, it is particularly important to further improve the accuracy of the 1゛43 type provided on the circumference, and to improve the accuracy of the # type end where the joint between the circumference and the width portion where the tooth pattern is provided is formed. This is the purpose.

Next, an embodiment of the present invention will be described with reference to the drawings.The manufacturing process of the present invention can be roughly divided into four steps. That is, the first step is a preparation step (11), the second step is a mold processing step (2), the third step is a main processing step (3), and the fourth step is a finishing step (4).

In the preparation process (1), the external shape of the toothed pulley (5) is not performed, and the tooth mold (5) is exclusively created IV! In the preparation process,
The process of preparing to create this tooth pattern (5) is the most important process that determines the quality of the toothed pulley (5) at the time it becomes a toothed pulley (5), and although the complete shape is not formed, In particular, this first step cannot be neglected, as it also determines the quality of the strength of the tooth pattern (5). In addition, in this first step, the tooth pattern (
5) The basic molding is done by machining as well as by adding bosses (6) as necessary.
A bead (8) for the purpose of forming or reinforcing the width part (7)
) indicates that the processing is also done by press working at the same time. To explain this first step in more detail, a smooth, perfectly circular soft iron plate is used as the material (9), and the width part (
Set a perfect circle line (a) forming 7) with a certain required radius from the center (0), and set a concentric cut circle line 1b) with a slight gap inside the perfect circle line (a). At the same time,
Outside the circular line (a) and with toothed boo IJ - (
/! A distance between the material circumference (d) and the circumferential width (C) that can form a tooth width that can be used as the tooth pattern (5) at the time when the material circumference (d) and the above-mentioned Cutting circle line (b)
The tooth pattern (5) to be formed from the center (0) between
) are provided in a radial manner by press working. The work of producing the uneven stripes Ql is a process that determines the quality of the finished tooth pattern (5), so it cannot be neglected. That is, it is processed as shown in FIG. Figure 2 is a front view of the expanded material circumference (d) of the material (9) that has been subjected to the patterning process of 11. This shows the smooth state of the circumference (d).

The uneven end face shape formed on the circumference (d) of this material is
It is much larger than the cross-sectional shape of the tooth pattern (5) in the hit toothed pulley 4, and the perfect circular line (
The cross-sectional shape of the uneven strip (II) in a) is the finished tooth shape (
The scale is similar to 5). In the circumferential width (C) on the outer periphery from the perfect circle line (a), the material is stretched by the action of forming the uneven stripes aω, and is also subjected to a compression action. Therefore, the shape formed in the preparatory step (1) has a dish shape with a thick circumferential width (C) as shown in the FIrr view of FIG. 3, and has a "bevel gear" shape in plan view. There is. In this manner, when forming the uneven strips U, the bosses (6), beads (8), and round holes are also processed at the same time as described above, if necessary. In addition, if the type of the tooth pattern (5) to be formed is a "flat tooth", as described above, the uneven stripes that will be the original shape of the tooth pattern (5) can be used as a perfect circular material (9).
The cutting circle line (b) with its radiation angle from the center (0) of
It is provided between the material circumference (d) and the material circumference (d).
If a tooth profile of "Hasuba" is required, it should be provided so as to be distal from the cutting circle line (b) to the material circumference (d). ) depending on the desired manufacturing shape and can be set arbitrarily.

In this way, in the preparation step (1) of the first step, the original shape of the tooth pattern (5) is formed around the flat disc material (9). In the next step, mold processing step (2), in the step of forming the outer shape of the toothed pulley (5), the toothed part (5) formed in the first step is replaced with the toothed pulley (4). ) is formed so that it is parallel to the axis at the time. That is, the tooth pattern (5
) The forming part is processed so as to be perpendicular to the width part (7) in this mold processing step (2). The tooth pattern (5) is provided in the preparatory step (11) with the cut circle line (b) inside the perfect circle line (a) as the inner starting point. At this point, the required tooth width is the circumferential width (C) measured from the perfect circle line (a) to the material circumference (d).However, as mentioned above, the dimension larger than the circumferential width (C) is the length of the tooth pattern (5). Therefore, in this mold processing step (2), the diameter of the width part (7) and the tooth pattern (5)
) It is not necessary to clearly divide the length and curve the width part (
7) and the tooth pattern (5) are formed with a small radius bending point that can be distinguished from the tooth pattern (5), and the tooth pattern (5) parallel to the axis is formed. This mold processing consists of forming these molds and compressing each tooth width and both groove dimensions of the tooth mold (5) formed based on the perfect circle M (a). The rough processing step (2), which is the second step, is the basic form of press working itself, and the female mold (12 is the dimension corresponding to the desired tooth width of the toothed pulley (5), that is, The circumferential width (
C) from the material circumference (d) with a dimension larger than that of the secondary perfect circle fJ
A recess (+3
1 is recessed, and the corresponding punch (141 is a one having an outer periphery that has exactly the same shape as the inner shape of the desired toothed pulley (N), and is made in the original shape of the tooth pattern (5) in the previous process. A material (9) provided with uneven lines (IQ) is placed in the openings of the recesses Q and 1 in the mold (12), with the center (0) and the tooth pattern (
5) is placed so as to match the concave and convex strips 11α, and press processing is performed by applying the necessary impact force to the punch. In this rough processing step (2), a substantially planar material (9) is placed. Desired toothed pulley (~+1) The toothed pulley is formed to be slightly wider than the tooth width forming R(5), that is, it is a deep pulley.

After finishing the rough machining process (2), in the next main machining process, a rough machining process is performed to form a rough machining part that connects to the inner end of the tooth profile (5), which was formed longer than the desired tooth width in the previous process, that is, to the width part (7). At the same time as crushing the end portions and forming the desired tooth width of the tooth shape (5), corner portions of each unit tooth shape (5) compressed and formed in the mold processing step (2) in the tooth shape (5). This process is performed using a press to increase the accuracy of the process. This is the main purpose of this invention, and in order to establish the shape of the width part (7) and the end of the tooth pattern (5) at the connection point, the tooth pattern (5) formed by crushing the starting end of the tooth pattern (5) is crushed. m
A right-angled curved line (
Process so that e) is formed. This is a tooth pattern (5)
In this case, the accuracy must be uniform over the entire length of the tooth width forming the tooth profile (5). The width portion (7) of this tooth pattern (5) is formed as the starting end of the tooth pattern (5) because the flat part does not require high precision except for the diameter dimension. The crushed portion is changed to the outer periphery of the width portion (7). In this way, the once formed tooth pattern (5) is crushed and a right-angled bend line (
e) is established, and the starting end of the tooth pattern (5) formed by the right-angled bending line (e) can be formed into an end surface such as a cross section of the tooth pattern (5). In this way, this main processing step (
3) is the high precision production of the end of the tooth pattern (5) that connects with the width part (7) and the precision machining of the entire tooth pattern (5), and then the next finishing step (4) is the manufacturing of the tooth pattern (5) with high precision. 5) is intended to improve the accuracy of the corner portions. The device used in this processing step (3) is substantially the same as the device used in the mold processing step (2).

These are those that are more accurate than those used in the mold processing step (2).

The finishing step (4), which is the final step, is a step whose main purpose is to adjust the formation of the tooth pattern (5).
) with a carefully selected edge trimming part (16+ is provided in the middle circle, an inlet part < 17) on the upper part, and a finishing metal provided at the lower part of the expulsion part whose diameter is larger than the diameter of the edge trimming part αe. The workpiece that has undergone the main processing step (3), which is the third step, is attached to the outer periphery of the male mold, whose outer shape matches the inner shape of the toothed pulley (5), which has the desired configuration. Toothed pulley (
5) is fitted, and a striking action is applied from above the receiving part (I7) of the finishing mold to forcibly force the end trimming part (10) having a female tooth shape (151) into a press-fit type or the end trimming part ( 161 is press-fitted and passed through.

This female tooth mold (one) is forcibly and percussively press-fitted or press-fitted through the flattening sOe provided in the main processing step (3) of the previous process. By press-fitting the completed shape of the outline of 5) into the female tooth mold a9, in particular, the end face of the tooth mold (5),
In addition, the accuracy of corners, etc. can be further improved.

Although it depends on the overall shape of the toothed pulley (A) to be applied to this finishing mold part 9, it is preferable that the toothed pulley (A) has a shape that can be penetrated toward the ejecting part rather than being press-fitted into the female toothed part U9 and stopped. If so, a method of force-fitting and passing is preferable for forced shaping.

This invention provides a toothed pulley (A
), and in particular, the toothed pulley (5) made by this method is intended to be constructed so that it can be used in the same way as the conventional gear constructed by the cutting method. It is necessary to further improve the 111K of the tooth profile (5) to be formed. As mentioned above, the dimensions of this invention are that a single sheet metal is molded by press working, and both the molded tooth mold (5) and the 1m part (7) are made of the same material, especially the width part (7). ) It was difficult to obtain the expected accuracy in the end configuration of the tooth profile (6) that connects with ,
New configuration requirements were developed.

■ In the preparation step (1) of the first step, the uneven line Cl0) provided in the width from the cutting circle line (b) of the circular material to the material circumference (d) is The tooth profile (5
) to form.

■Next, in the second mold processing step (2), the tooth mold (5) formed in the previous step is curved so that the center direction is parallel to the tooth width, but the tooth width is significantly larger than the desired width. The tooth patterns (5) are formed so that they are parallel to each other.

■ In the main processing step (3) of the third step, the width portion other than the desired tooth width dimension (force side tooth profile (5) portion is crushed to form the width portion (part of the force) and the width portion (7) A right-angled curved line (e) is formed at the boundary between the tooth pattern (5) and the tooth pattern (5), and at the same time, the precision of the rough tooth pattern (5) is improved.

■ A particularly carefully selected female tooth type Q51 is used for the finishing mold 0 (1 (9 is the middle, with an inlet part (17) at the top and an expulsion part (17) at the bottom). The tooth pattern (5) on the side that connects the entire tooth pattern (5) and the width part (7) by forcing the workpiece that has gone through the main processing step (3) in the previous process into a press-fit type or through a press-fit insertion. Improve the accuracy of the edge shape.

As described above, the material is made of sheet metal, connected from the width part (7) by press working, and used as a gear provided parallel to the axis of the boss (6) provided at the center (0) of the width part (7). The high-precision tooth pattern (5) to be obtained and both end surfaces of the tooth pattern (5) are used as gears [By performing a small number of press forming processes to create a neat shape with no inferiority, the material hardening phenomenon is minimized. It can be stopped.

The additional related invention of Japanese Patent Application No. 139691/1983 is to set the desired tooth width dimension outside the outer circumferential position of the width part of the desired diameter from the center of the material of the plate-shaped iron plate of a smooth regular circle, and In the preparation process of the first process, work to provide uneven stripes to form the desired number of teeth radially or distally from the center in the circumferential width part, and the tooth shape should be formed in the main machining process of the second process. The outer periphery provided with the uneven stripes formed in the previous process is bent at right angles at the outer circumferential position of the width part so as to be parallel to the axis, and at the same time, the uneven stripes are formed into a tooth shape, and the workpiece formed in this main processing step. In the third finishing step, the tooth shape of the object is orthodontically shaped to form a highly accurate tooth shape, but the invention of the present application is based on the outer periphery of the material of the plate-shaped iron plate having a smooth regular circle. In the preparation step of the first step of providing the first stage of unevenness that will become the tooth profile, the desired tooth width is to be formed up to the cutting circle line set inward of the width part from the perfect circle line that is the outer circumferential position of the width part of the desired diameter. Work is performed to provide uneven stripes in a radial or centrifugal manner with the center of the width part as the center position on the circumferential width of the dimension that is longer than the dimension, and in the second molding process, the entire surface where the uneven stripes were provided in the previous process is The outer circumferential width is made parallel to the axis and perpendicular to the convergence width, and the uneven stripes are formed in a tooth shape,
Furthermore, in the third main processing step, the tooth profile formed to the position that should be the outer periphery of the width part is crushed to the inner edge of the desired tooth profile width, and the boundary between the inner edge of the tooth profile and the outer periphery of the width part is drawn with a right-angled bend line. At the same time, the accuracy of the tooth mold is improved while clarifying the tooth mold, and furthermore, the shape of the tooth mold is orthodontically shaped in a fourth finishing step to form a highly accurate tooth mold.

[Brief explanation of the drawing]

Figures 1 to 3 show the form of the workpiece that is formed in the preparation process of the first step. Figure 1 is a plan view, Figure 2 is a front view showing the developed state of the circumference of the material, and Figure 3 is Figure 1 I-
The 1-line cross-sectional view and FIG. 4 are cross-sections 1 and 2 showing the molding process of the second step. Figure Lm5 is a cross-sectional view of the product processed in Figure 4, Figure 6 is a first complaint drawing showing the main processing step of the third step, Figure 7 is a cross-sectional view of the product processed in Figure 6, and Figure 8. 9 is an enlarged sectional view taken along the line 8--■, and FIG. 10 is an enlarged sectional view of the product. (1) Preparation process, (2) Mold processing process, (3)
−・Main processing process, (4)・Φ finishing process, (5)・Tooth shape, (force・・width part, (9)・・material, Qυ・・uneven strip, (
01... Center, (a)... Perfect circle line, (b)... Perfect circle line, (C)... Circumference width, (d)... Material circumference, (e)...
[σ confession broken line. Patent applicant Riken Kaki Kogyo Co., Ltd. Procedural amendment (method) 3. Person making the amendment 4. Agent 6. Number of inventions increased by amendment 7. Target of amendment Drawings

Claims (1)

[Claims] In the preparation process, desired teeth are formed on the flat iron plate material of a smooth regular circle at a slightly inner circumferential position from the center of the material, which is the width part outer periphery of the desired diameter, and radially or distally on the outside of the circle with the material circumference. The flat bottom is clearly uneven and formed into a shape with uneven stripes that will become the original shape of the butcher, and in the next molding process, it is placed inside the outer periphery of the width part of the desired diameter dimension. A tooth pattern is formed parallel to the axis with an uneven strip having an inner end as a leading shape, and the workpiece formed in this ill-type processing step is processed to have the desired tooth width in the main processing step of the third step. Crush the tooth pattern and the excess tooth pattern formed up to the planned position on the outer periphery of the width part so that the width part has the desired diameter. At the same time, the accuracy of the tooth pattern is improved, and the shape of the tooth pattern is corrected in the finishing process of the fourth step of the workpiece formed in this main processing step, resulting in high precision! A sheet metal having a tooth pattern on the circumference, which is formed into an i-type, and is characterized in that all steps of the preparation process, mold forming process, main process, and final finishing process are performed by press working. How to make drums.