JP6126670B2 - Cam device grouping method - Google Patents

Description

  The present invention relates to a grouping method for compactly unitized cam devices that are mounted between a fixed mold and a movable mold in order to drill holes in a workpiece.

  In the design of a press die, it is necessary to arrange various functional units such as a cam device, a guide post, a workpiece detection device, and a carry-out conveyance device without interfering with each other. In order to make this easy for mold designers, specialized manufacturers of functional units have standardized various units and listed their detailed shape and movement in the catalog in addition to specifications such as load capacity. It was. In particular, in the cam device, after completion of the mold operation, the cam device does not exhibit the endurance according to the specification due to the contact of the sliding surface of the cam device due to the mounting error when fixed to the mold, and the cam device is camped at short intervals. The device was being replaced.

JP 2000-135526 A

  The processing force required for the cam device for press dies varies depending on the workpiece (workpiece) material and plate thickness as well as the mounting position of the processing tool on the cam slider of the cam device. The machining force that can be tolerated as a cam device becomes smaller as it deviates from the center. Therefore, in the conventional cam device, the size of the cam device changes each time the thickness of the workpiece (workpiece), the material, and the mounting position of various functional units change in the mold design process. The burden on the designer for the design change was increased. In addition, frequent replacement of the entire cam device can be used to reduce the durability of the cam device due to errors in the work (workpiece) material, plate thickness, mold manufacturing and mounting errors that occur after the mold is in operation. It was.

The present invention includes a cam holder having a cam holder sliding contact surface, a cam slider sliding contact surface slidably contacting the cam holder sliding contact surface, and a cam slider cam surface, and having a tool mounting surface for a processing tool. a slider, brought into contact with the cam slider cam surface, a grouping method of a cam apparatus having a cam driver having a cam driver cam surface for driving the cam slider in a predetermined processing direction, stepwise in different working force includes a plurality of cam devices that are set to, characterized in that it constitutes a group has the same outline size of a plurality of cam device.

  The cam holder sliding contact surface is detachable from the cam holder, and the cam driver cam surface is detachable from the cam driver. The cam holder sliding surface is a sliding member that is detachable from the cam holder and has the same shape and compatibility within the same series (group) of the same outer shape; The cam surface member is detachable from the cam driver and has the same shape and compatibility within the same series (group) having the same outer shape.

  Further, when the combination of the material of the cam slider sliding contact surface and the cam holder sliding contact surface is the same as that of the cam driver cam surface and the cam slider cam surface, the cam slider sliding contact surface and the cam holder sliding contact The surface roughness after finishing the contact surface is made rougher than the cam driver cam surface and the cam slider cam surface, or the solid lubricant filling density of the cam slider sliding contact surface and the cam holder sliding contact surface is set as a cam driver. Including changing the cam surface and the cam slider to be larger than the cam surface.

  According to the cam device grouping method of the present invention, the change of the entire cam device can be easily replaced.

It is a disassembled perspective view of the cam apparatus 1 of this embodiment. It is a figure which shows the relationship between the processing force of the cam apparatus 1 of this embodiment, and a cam width.

  As shown in FIG. 1, the cam device 1 of the present embodiment is movable by a cam holder 2 having a sliding contact surface 2a and a sliding contact surface 3a that is in sliding contact with the sliding contact surface 2a of the cam holder 2 and the cam surface. A cam slider 3 that moves in a predetermined machining direction at 3b, and a cam driver 4 that has a cam surface 4a that contacts the cam surface 3b of the cam slider 3 and moves the cam slider 3 in a predetermined machining direction. .

  The wear characteristics of the sliding contact surface 2a of the cam holder 2 and the sliding contact surface 3a of the cam slider 3 are such that the material of the sliding member 2b and the sliding portion 3c of the cam slider 3 is constant if the surface pressure of the sliding portion is constant. , Processing method, heat treatment, and further, the solid lubricant sliding contact surface 2a or the amount of filling with respect to the sliding contact surface 3a.

  Similarly, regarding the wear characteristics of the cam surface 4a of the cam driver 4 and the cam surface 3b of the cam slider 3, the cam surface member 4b of the cam driver 4 and the cam surface of the cam slider 3 are provided if the surface pressure of the sliding portion is constant. It is determined by the combination of the material of 3c, the processing method, the heat treatment, and the packing density of the solid lubricant on the cam surface 4a or the cam surface 3b.

  Therefore, if the material of the sliding part, the processing method, and the cam width, which is the basic dimension of the cam device, are selected according to the purpose, the cam device of the same outer shape has a large processing capacity, slow wear progress, and within the same rank. The maximum machining force at 1 can be set larger than the lowest machining force of the cam device of one rank higher. FIG. 2 shows an example of the combination, and other combinations are possible. Although not shown in FIG. 2, the initial wear is increased by changing the processing method, for example, by roughening the surface roughness of the processed surface, or by controlling the slow progress of the wear, Although the packing density is increased and wear progresses quickly, methods other than the combination of materials such as ensuring stable wear characteristics that do not cause destructive damage such as seizure are also included.

  Therefore, in order to improve the machining force of the cam device after the mold is operated by exchanging parts, it is necessary not to replace the cam slider that requires adjustment of the accuracy of machining tools such as piercing punches for drilling. As shown in FIG. 1, it is formed of a sliding member that is a separate member from the cam holder 2 that is the main body side for the sliding portion 2b, and is detachably attached to the mounting surface of the cam holder 2 on the main body side with bolts or the like. A sliding member is attached.

  Further, as shown in FIG. 1, the cam slider 3 and the cam driver 4 are similarly detachable from the cam surface 4b as a cam member on the cam driver base 4c and can be easily replaced with bolts. Will not be bulky.

  As shown in FIG. 1, the wear of the cam surface 4 a of the cam driver 4 and the cam surface 3 b of the cam slider 3 attaches a machining tool (such as a punch or a bending tool) to the tool mounting surface 3 e of the cam slider 3. In addition, the relative positional accuracy between the processing tool and the workpiece (workpiece) is required to be small because high accuracy is required by adjustment or the like. On the other hand, the cam surface 4 a of the cam driver 4 is fitted and slidably contacted with the V-shaped groove-shaped cam surface 3 b of the cam slider 3.

  The cam surface 3b of the cam slider 3 and the cam surface 4a of the cam driver 4 are fixed in position by a V-shaped groove and contact with each other almost without contact, whereas the sliding surface 3a of the cam slider 3 and the cam holder 2 are in contact with each other. The slidable contact surface 2a is a so-called single-contact between the planes of the slidable contact surface 3a of the cam slider 3 and the slidable contact surface 2a of the cam holder 2 due to errors corresponding to cam mounting errors and mold machining errors. To do. In order to eliminate this contact, it is necessary to prevent the contact surface pressure from becoming excessive by increasing the contact area due to the familiarity during the initial wear period.

  Therefore, compared with the wear characteristics of the cam surface 4a of the cam driver 4 and the cam surface 3b of the cam slider 3, the wear characteristics of the slide contact surface 3a of the cam slider 3 and the slide contact surface 2a of the cam holder are the same surface pressure × The wear characteristic is such that the initial wear is large with respect to the sliding speed and the wear amount with respect to the sliding distance is large. Thereby, expansion of the contact area (that is, elimination of the one-piece contact) due to the familiarity in the initial wear period by the sliding contact surfaces 2a and 3a proceeds, and an excessive contact surface pressure of the sliding contact surfaces 2a and 3a can be prevented. Further, by reducing the wear on the cam surfaces 3b and 4a, the relative positional accuracy between the machining tool of the cam slider 3 and the workpiece (workpiece) can be satisfied.

  When the sliding contact surface 3a of the cam slider 3 and the sliding contact surface 2a of the cam holder have the same material combination as the cam surface 4a of the cam driver 4 and the cam surface 3b of the cam slider 3, the sliding contact surface of the cam slider 3 is used. The surface roughness after finishing of 3a and the sliding contact surface 2a of the cam holder is made rougher than the cam surface 4a of the cam driver 4 and the cam surface 3b of the cam slider 3, or the sliding contact surface 3a of the cam slider 3 and the cam This can be dealt with by changing the packing density of the solid lubricant on the sliding contact surface 2 a of the holder larger than the cam surface 4 a of the cam driver 4 and the cam surface 3 b of the cam slider 3. Of course, changing the combination of sliding materials is also effective for this purpose.

  As shown in Table 1, the cam device 1 has a working force (for example, minimum, small, medium, slightly large, large, maximum) depending on the processing force (the material and thickness of the member to be drilled or bent). Can be selected from light, normal, slightly heavy, and heavy depending on the combination of the sliding part materials (for example, low surface pressure, normal surface pressure, slightly high surface pressure, high surface pressure). . By selecting the cam width, the maximum processing force in a group with a certain cam width (referring to the maximum processing force corresponding to “(d) weight” in the group) is adjacent to the cam width by one group. Is set to be larger than the minimum processing force of the group (refers to the smallest processing force corresponding to “(e) light” in the group), and covers to compensate.

  As described above, in the cam device having the adjacent width, for example, the processing force of the small cam device having the specification “heavy” is the processing force of the next smaller cam device having the specification “light”. It is set to be larger, and substitution is effective with the cam device of the next width (see FIG. 2).

  Other members shown in FIG. 1 are a return elastic member 5, an extension rod 5 a, a stopper 6 for preventing slipping, a slide keeper 7, and a forced return follower 8. The return elastic member 5 is, for example, a gas pressure cylinder, a coil spring, or the like. In FIG. 1, a gas pressure cylinder is used, the extension rod 5a is brought into contact with the front wall of the cam holder 2, and the cam slider is returned to the initial position by the elastic force of the return elastic member.

  The stopper 6 is a wall that prevents the cam slider 3 whose neck is suspended by the slide keeper 7 from slipping out backward. The slide keeper 7 is fixed to both side walls of the cam holder 2 and sandwiches the neck portion of the cam slider 3 with an L-shaped locking portion below the cam keeper 7 so that the cam slider 3 can slide in the front-rear direction and the vertical direction. Suspend on. The forced return follower 8 engages with the guide groove on the cam driver 4 side to forcibly move the cam slider 3 toward the initial position when the processing tool of the cam slider 3 is caught on the workpiece and is not easily pulled out.

  According to the cam device 1 of the present embodiment, the cam holder 2 reciprocates in the vertical direction together with the upper mold of the mold from the top dead center to the bottom dead center, whereby the cam slider 3 is processed along the front-rear direction. Reciprocated in the direction. As a result, the machining tool provided on the tool mounting surface 3e of the cam slider 3 moves in the machining direction and performs, for example, drilling or bending on the workpiece placed on the mold. As a result, a certain amount of wear due to sliding occurs in the sliding portion constituted by the sliding contact surface 2a and the sliding contact surface 3a and in the sliding portion constituted by the cam surface 3b and the cam surface 4a.

  In this embodiment, the wear of the sliding portion constituted by the sliding contact surface 2a and the sliding contact surface 3a progresses at an early stage, and the mutual contact between the sliding contact surface 2a and the sliding contact surface 3a due to mold processing and assembly errors. It is possible to eliminate the per contact of the sliding portion at the initial stage of the mold operation, and to exhibit the processing capability according to the specifications of the cam device.

  Further, the wear amount of the cam surface 3b and the cam surface 4a that defines the relative positional relationship of the movement of the machining tool with respect to the workpiece (workpiece) is set smaller than the wear amount of the sliding contact surface 2a and the sliding contact surface 3a. Therefore, it is possible to eliminate the adverse effects caused by the contact at the initial stage of operation and to reduce the change in the position accuracy of the processing tool.

  In addition, when the wear of the sliding contact surface exceeding the initial assumption of the mold design occurs after the mold is operated, the material of the original design so that the sliding member 2b or the cam surface member 4b is a combination with less wear. It is possible to cope with wear exceeding the assumption by exchanging with parts of the same shape different from the above. Further, the replacement work can be easily performed with bolts, and the machining accuracy of the cam device 1 is ensured to be constant. Further, since the machining forces of the adjacent cam devices overlap each other for each width of the cam device, changes in the entire cam device can be easily replaced.

  The cam device 1 of the present embodiment achieves a reduction in design time and a burden on the designer at the mold design stage, and a slight machining of the mold that is inevitable to the mold, which occurs after the mold is operated, This reduces the man-hours required for mold maintenance by preventing the malfunction caused by the error of the cam device while maintaining the machining accuracy at a high level. Furthermore, the performance improvement can be easily performed by exchanging parts, the machining accuracy can be maintained with high accuracy, and it can be used for various types of processing tools.

1 cam device,
2 cam holder, 2a sliding surface,
2b sliding member,
3 cam slider, 3a sliding contact surface,
3b cam surface, 3c sliding part,
3d cam face,
4 Cam driver, 4a Cam surface,
4b cam surface member, 4c driver base,
5 return elastic member, 5a extension rod,
6 Stopper stopper,
7 Slide keeper,
8 Forced return follower.

Claims (2)

A cam holder having a cam holder sliding contact surface;
A cam slider having a cam slider sliding surface that is in sliding contact with the cam holder sliding surface, and a cam slider cam surface, and a cam slider having a tool mounting surface for a processing tool;
A cam driver having a cam driver cam surface that contacts the cam slider cam surface and drives the cam slider in a predetermined processing direction,
A grouping method of cam devices, comprising a plurality of cam devices set in stages with different machining forces, and forming a group in which the cam widths of the plurality of cam devices are the same. 2. The grouping method for cam devices according to claim 1, wherein the groups are formed into a plurality of groups for each cam width of the cam device.