Abstract: A slide cam die including a slide cam base, a wedge-shaped slide cam sliding on a guide surface of the slide cam base and mounting a press tool such as a punch or a trimming blade thereon, and an actuating cam driving the slide cam in contact therewith. A press tool is mounted on the slide cam with an adapter plate interposed therebetween. With this configuration, when a pierce punch, or a flange block, or the like, needs to be removed for reasons such as the adjustment, the pierce punch or the flange block can be individually demounted without removing the entire slide cam. This results in reduced working time. In addition, since only the adapter plate is replaced, cost savings can be achieved by reusing the slide cam. Furthermore, a given slide cam can be used while still maintaining flexibility in design and use of the slide cam die.

Abstract: The present invention provides a rotary cam moving apparatus of a negative angle shaping mold which can avoid an interference of rotary cams, require no canceling process in rotary cam end portions with a high accuracy, and maintain a strength in the rotary cam end portion.

Abstract: A rotary drive apparatus for a rotary body for rotating a rotary body through extension and extraction of the piston rod of the cylinder accurately determines a rotation start and a rotation termination position, and performs intrusive forming with the rotary cam being accurately positioned. As such, high-quality work processing can be implemented; and furthermore, shocks of a cylinder are absorbed, and are not transferred to the rotary body.

Abstract: It is an object that when a pierce punch, a flange block or the like are necessary to be demounted for reasons such as adjustment, the pierce punch, the flange block or the like is singly demounted without taking out a slide cam as a whole to thereby reduce a working time, in addition, only an adapter plate is replaced to thereby enable the reuse of a slide cam and attain cost reduction, furthermore, a given slide cam is used to increase flexibility in design aspect to a great degree.

Abstract: A pressing apparatus provides an urging force for a slide cam to press only when necessary, and elsewhere this pressing-force is maintained as small as possible. Abnormal wear and seizure of the slide cam, slide cam base and the sliding portion of the driven cam are prevented. The pressing apparatus can also provide a larger retracting force for the slide cam near a lower dead center of a pressing stroke. The present apparatus includes a slide cam slidably provided in a guidepost attached to the slide cam base and guided by the slide cam base, a pressing member held by the slide cam, a retracting-spring between the slide cam base and the slide cam for urging the slide cam, and a driven cam for contacting and driving the slide cam. A pressing-spring for urging the slide cam only near a lower dead center of a pressing stroke is provided between the slide cam base and the slide cam and/or between the slide cam and the driven cam.

Abstract: A negative-angle forming die includes a lower die half and an upper die half. A rotary cam is rotatably provided in the lower die half, and a slide cam is slidably opposed to the rotary cam. An automatic retractor is provided in the lower die half for pivoting the rotary cam to a position allowing the work to be taken out of the lower die half after a forming operation. The rotary cam is divided into an end rotary cam and a main rotary cam which are both disposed on a same axis of pivoting. The end rotary cam is not pivoted for an initial predetermined period of the retraction, and thereafter, the end rotary cam is moved axially toward the main rotary cam.

Abstract: The present invention provides a negative-angle forming die comprising a lower die half having a supporting portion for placing a sheet metal work, and an upper die half to be lowered straightly downward onto the lower die half for forming the work, an intrusion forming portion formed in the lower die half at an edge portion near the supporting portion inward of a downward stroke line of the upper die half, a rotary cam rotatably provided in the lower die half, a slide cam including an intrusion forming portion and slidably opposed to the rotary cam, and an automatic retractor provided in the lower die half for pivoting the rotary cam back to a position thereby allowing the work to be taken out of the lower die half after a forming operation, the work placed on the supporting portion of the lower die half being formed by the intrusion forming portion of the rotary cam and the intrusion forming portion of the slide cam, the slide cam forming the work by sliding, the automatic retractor pivoting back the rotary

Abstract: The present invention provides a negative-angle forming die comprising a lower die half and an upper die half. The lower die half has an intrusion forming portion, a rotary cam, a slide cam, and an automatic retractor. The work is placed on the lower die half being formed by an intrusion forming portion of the rotary cam and an intrusion forming portion of the slide cam. The slide cam forms the work by sliding. The rotary cam has two ends each including a supporting shaft projecting therefrom. The supporting shafts are supported by the lower die half for rotatably supporting the rotary cam.

Abstract: Disclosed is a negative-angle forming die. The die has upper and lower halves. The upper die half has a supporting portion for receiving a sheet metal work, and an intrusion forming portion. The lower die half carries a plate-like cam which can be moved toward the lower die half for forming the work. The die also has a rotary cam, the ends of which terminate in first and second shafts journaled in the lower die half. The die also has a slide cam, which itself has an intrusion forming portion. This portion is slidably opposed to the rotary cam. The die is equipped with a cam follower arm centrally fastened to the supporting shaft. One end of the cam follower arm carries a cam follower in operable relationship with the plate-like cam carried by the upper die half. In operation moving contact between the plate-like cam and the cam follower causes the cam follower arm to rotate. This in turn causes rotation of the rotary cam.

Abstract: A pressing apparatus provides an urging force for the slide cam to press only when necessary, and elsewhere this pressing-urge is held as small as possible, whereby abnormal wear and seizure of the slide cam, slide cam base and the sliding portion of the driven cam are prevented. The pressing apparatus can also provides a large retracting force for the slide cam near a lower dead center of a pressing stroke.

Abstract: The present invention aims to simplify the negative-angle forming die as much as possible thereby reducing price, and at the same time aims to improve accuracy thereby making possible to provide a high-quality sheet-metal formed product.

Abstract: A slight pivoting movement makes a rotary cam out of a predetermined forming position, making an unwanted step in a curved surface of the work or making unable to form into an accurate curve. Sometimes, providing a product of accuracy in the order of {fraction (1/100)} mm was difficult, or it was impossible to provide a formed sheet metal product of a high quality. The present invention aims to maintain the rotary cam at a predetermined forming position thereby providing a formed sheet metal product of a high quality.

Abstract: A slight pivoting movement makes a rotary cam out of a predetermined forming position, making an unwanted step in a curved surface of the work or making unable to form into an accurate curve. Sometimes, providing a product of accuracy in the order of {fraction (1/100)} mm was difficult, or it was impossible to provide a formed sheet metal product of a high quality. The present invention aims to maintain the rotary cam at a predetermined forming position thereby providing a formed sheet metal product of a high quality.

Abstract: The present invention aims to eliminate the need for the timing adjustment of the air cylinder operation at the time of pressing operation and to simplify the piping necessary for the air cylinder.

Abstract: A press die includes a lower die, a slide cam movable along the lower die, and an energizing body disposed between the slide cam and the lower die to abut against both surfaces thereof for biasing the slide cam for movement in one direction along the lower die. The slide cam is provided with a plug having an outer diameter that is larger than an outer diameter of the energizing body and abutting against an end surface of the energizing body. This arrangement enables easy attachment and detachment of the energizing body to and from the press die.

Abstract: A negative angle-forming die includes a lower die for mounting a thin metallic plate workpiece onto a supporting portion thereof, and an upper die descendable in a straight direction towards the lower die for forming the workpieces by abutting against the workpiece. A columnar body is arranged in a freely rotating manner on the lower die by a pair of spaced-apart bearings, and has an intruding forming portion formed at an edge portion thereof. A slide cam is formed with an intruding forming portion, and is arranged to oppose the columnar body in a freely sliding manner with respect to the lower die. An automatic returning tool is arranged at the lower die for retracting the columnar body in a rotating manner to an extent with which the workpiece can be taken out from the lower die upon completion of forming.

Abstract: A press apparatus includes a passive cam to which a processing member such as a punch is mounted. Removal of the passive cam from a lower die for repair is made to be easy, and workability is improved. The press apparatus has an actuation cam in an upper die, a passive cam in a lower die which is contact-pressed and driven by the actuation cam, a guide base in the lower die for sliding and guiding the passive cam, guide posts which are mounted across the guide base and move so as to slide the passive cam, and a force applying device for applying a force to the passive cam towards an opposite-work side. In such a press apparatus, the passive cam is fitted onto the guide base so that when the guide posts which are mounted across the guide base are removed, the passive cam can be lifted up and dismounted.

Abstract: A negative angular forming die having a lower die for supporting a workpiece. An upper die is lowered with respect to the lower die to abut against the workpiece for forming the workpiece. A columnar body is rotatably mounted on the lower die, and a groove is formed in the columnar body in the axial direction of the lower die. A slide cam is supported on the upper die and is opposed to the columnar body. An automatic returning tool is provided on the lower die for rotating and retracting the columnar body to a position at which the workpiece can be taken out from the lower die after the forming process is completed. The workpiece is placed on the supporting portion of the lower die with the columnar body being turned, and the slide cam is slid to form the workpiece by an entering forming portion of the columnar body. The columnar body is turned and retracted by the automatic returning tool after forming so that the formed workpiece can be taken out from the lower die.

Abstract: A noise-reducing structure of a processing machine reduces the noise generated when a movable member of the processing machine abuts against a workpiece located on a workpiece holder of the processing machine. The processing machine may be a drawing die including a punch, a blank holder fitted around the punch and vertically movably supported by a cushion pin, and a vertically movable die disposed to face the punch. The workpiece may be a thin plate which is placed on the blank holder. As the die is lowered, the thin plate is sandwiched between the blank holder and the die for drawing the thin plate by the punch. A lower die base plate is provided with a pivotable lever member for pushing the blank holder so that the blank holder begins movement before the die collides against the thin plate. An operation cam for driving the lever member is disposed at a position on the die facing the lever member, and the die collides against the thin plate on the blank holder after the blank holder is in motion.

Abstract: A silent structure for a drawing die, includes: a punch, a blank holder vertically movably supported by a cushion pin fitted over the punch, and a die disposed such as to oppose to the punch for moving the die up and down, in which a thin plate lifted by the cushion pin is placed on the blank holder, and the die is lowered to clamp the thin plate by the blank holder and the die, thereby drawing the thin plate, wherein a sub-blank holder is disposed between the cushion pin and the blank holder, a resilient material is interposed between the sub-blank holder and the blank holder, a run-up clearance is provided between the sub-blank holder and the blank holder, a run-up lever is rotatably mounted to the sub-blank holder for pressing the blank holder to allow the blank holder to run up before the die collides against the thin plate on the blank holder, an operation cam for driving the run-up lever is disposed on the die at a location thereof opposed to the run-up lever, and the die collides against the thin plate