pressing tool

Abstract

The present invention relates to a pressing tool for forming a green cutting blade blank (8) by compacting powder. The pressing tool includes a stamping device (3) comprising: an axially extending front section having a front end in a cavity, the front section being operable to present an initial orientation and a target orientation; and an axially extending rear section connected to the front section and located axially rear of the front section. The pressing tool further includes: a movably arranged spacer element (10) operable to translate from a starting position to a target position; and an arm member (17) extending axially along the rear section (14) at a distance from the rear section (14). A connector unit (18) connects the arm member (17) and the rear section such that the distance from the rear section (14) to the arm member (17) is adjustable at a position axially forward of the connector unit (18). The spacer element (10) is arranged and configured to engage the arm member (17) via the arm contact point (19) and the rear section via the rear contact point (20). When the spacer element (10) is in the initial position, the distance from the arm contact point (19) to the rear contact point (20) in the axial projection on the axial plane is the rear starting distance, thereby the joint unit (18) is in the initial state and the front section (11) is in the initial orientation. When the spacer element (10) is in the target position, the distance from the arm contact point (19) to the rear contact point (20) in the axial projection on the axial plane is the rear target distance (24), thereby the joint unit (18) is in the target state biased toward the initial state and the front section (11) is in the target orientation.

Description

Technical Field

[0001] The present invention relates to a pressing tool for forming a green body of a cutting blade by compacting powder. Background Technology

[0002] The conventional method for producing cutting inserts for metal cutting is to form a green body by compressing powder in a pressing tool. Typically, the powder is filled into a cavity and compacted by a punch that can move along the pressing axis toward the cavity.

[0003] When pressing such a green body, a pressing burr is typically formed at the point where the green body contacts the outer edge of the punch. Problems arise when this pressing burr is not evenly distributed around the edge of the green body. For example, the width and size of the burr may differ on different sides of the green body. In subsequent processes, the green body is sintered to form a cutting insert, and this edge is treated to form the cutting edge. Variations in the size of the pressing burr can cause changes in the geometry of the cutting edge, which can adversely affect the performance of the finished insert. Summary of the Invention

[0004] The object of the present invention is to at least partially eliminate the above-mentioned problems. This object is achieved by the pressing tool according to claim 1.

[0005] An inventive pressing tool for forming a green cutting blade blank by compacting powder, comprising: - A cavity for receiving the powder to be compacted, and - A stamping device, movably arranged along a stamping axis, for compacting powder in the cavity, wherein the stamping axis defines an axial direction and an axial plane. The stamping device includes, - An axially extending front section having a front end in the cavity, the front section being operable to present initial orientation and target orientation, and - An axially extending rear section, which connects to the front section and is located axially rear of the front section. The pressing tool also includes - Spacer elements arranged in a movable manner, wherein the spacer elements are operable to translate from a starting position to a target position. - An arm member that extends axially along the rear section at a distance from the rear section, and - Connector unit, in - The connector unit connects the arm member and the rear section, such that the distance from the rear section to the arm member at a position axially forward of the connector unit is adjustable. - The spacer element is arranged and configured to engage the arm member via an arm contact point and the rear section via a rear contact point. - When the spacer element is in the initial position, the distance from the arm contact point to the rear contact point, viewed in the axial projection on the axial plane, is the rear initial distance, thereby placing the joint unit in the initial state and the front section in the initial orientation, and - When the spacer element is in the target position, the distance from the arm contact point to the rear contact point is the rear target distance when viewed in the axial projection on the axial plane, thereby the joint unit is in the target state biased toward the initial state and the front section is in the target orientation.

[0006] It has been found that the cause of uneven burrs is misalignment of the cavity or punch, or manufacturing inaccuracies of the cavity and / or punch. Due to the inclusion of the arm member, joint unit, and spacer element, the front section of the stamping device can be laterally or reoriented along the direction of rotation. The spacer element is operated to adjust the distance between the arm member and the rear section of the stamping device by tilting or rotating the axis of the front section. Thus, the front section achieves a targeted orientation. Furthermore, by selecting the initial orientation of the front section as a reference orientation, due to the offset of the joint unit, this orientation can be restored by simply moving the spacer element back to its initial position.

[0007] The pressing tool according to the invention is suitable for forming a green cutting insert by compacting powder (e.g., cermet, cemented carbide, or metallurgical powder). After the finished green cutting insert has been formed and removed from the pressing tool, it can undergo further processing, such as sintering, grinding, edge treatment, and / or coating. The cutting insert can be obtained from the green cutting insert and used for machining, such as metal cutting. Examples of such cutting inserts are milling inserts, turning inserts, and drilling inserts. Preferably, the insert is subsequently used for metal cutting with chip removal.

[0008] The pressing tool according to the invention can be of any suitable type. Preferably, the pressing tool includes a mold forming a cavity. The pressing tool can be a so-called parting pressing tool, wherein the mold includes several movable parts, such as two or four. The cavity is formed by the space defined by the parts of the mold in a closed position near the parts.

[0009] The pressing tool includes at least one pressing device. The pressing tool may include several pressing devices arranged, for example, adjacent to each other, concentrically to each other, or opposite to each other. Each pressing device is operable to move along a pressing axis toward a cavity for compacting powder therein. According to an embodiment, the pressing tool includes two pressing devices arranged on opposite sides of the cavity such that when they are operated to move along their respective pressing axes toward the cavity, the cavity is closed and the powder therein is compacted.

[0010] The stamping axis may coincide with the central longitudinal axis of the front section of the stamping device, for example, when the front section is in its initial orientation. Alternatively, in the initial orientation of the front section, the longitudinal axis of the front section is parallel to or inclined relative to the stamping axis. According to an embodiment, the stamping axis is a vertical axis during normal operation.

[0011] The stamping axis defines a forward direction toward the cavity and an opposite rearward direction, and also defines axial planes. Each axial plane is located at a corresponding position along the stamping axis and is normal to the stamping axis. The axial projection of a point onto an axial plane should be understood as an imaginary movement of that point parallel to the stamping axis onto the axial plane in question. When measuring the distance between a first point and a second point as seen in the axial projection onto the axial plane, both points are axially projected onto the same axial plane, and the distance between them is measured in that plane from the first point to the second point.

[0012] Distance should be understood as linear distance. The path of travel of a related point or component can be a linear path, or it can deviate from a linear path, for example, by acting as an arc or curve in a plane or space.

[0013] The stamping device includes a front section having a front end located within a cavity, wherein preferably, the front end has an axially foremost front point. In embodiments where the front end has multiple foremost points, any one of these points may be designated as the foremost point. The axially foremost point of the front end is typically also the axially foremost point of the stamping device. A "front point" is a center point located in the same axial plane as the foremost point, preferably on the longitudinal axis of the front section. The front section includes at least the front end having an axially foremost point and a front end with that front point.

[0014] A rearward portion of the stamping device is included axially rearward of the front section. The rear section connects to the front section. Optionally, the rear section extends axially rearward from the rear end of the front section, or one or more intermediate sections exist between the rear and front sections. Preferably, the front and rear sections are configured such that when the rear section shifts at the rear contact point, the front section shifts accordingly. The rear section extends axially forward at least to and includes the rear contact point. Preferably, both the front and rear sections are longitudinal sections extending along the stamping axis.

[0015] According to an embodiment, the front section is included in a replaceable stamping tool. The stamping tool typically includes a connecting portion that, together with a complementary connecting portion included in the stamping device, forms a coupling. The coupling securely holds the stamping tool, thereby achieving a stable and robust stamping device. Using a replaceable stamping tool, the front section can be easily replaced when worn or when a different pressing operation is to be performed. The coupling, including two connecting portions, is included in the rear section, wherein the front section is the section located axially forward of the complementary connecting portion.

[0016] Alternatively, the stamping device is an integral unit of the pressing tool.

[0017] The arm member extends axially along the rear section at a distance from the rear section. Preferably, the arm member is in the form of a plate extending alongside the rear section, wherein one of the plate's main surfaces faces the rear section. Alternatively, the arm member may form a rod or beam, which may be solid or hollow.

[0018] The connector unit connects the arm member and the rear section, such that the distance from the rear section to the arm member is adjustable at a position axially forward of the connector unit.

[0019] The joint unit should be understood as a region or component that allows at least the rear section to flex, for example, by pivoting, rotating, tilting, and / or bending in response to an increase and / or decrease in its distance from the arm member. Preferably, the joint unit is configured and arranged to allow both the rear section and the arm member to flex in response to an increase and / or decrease in the distance from the rear section to the arm member. Optionally, the joint unit is configured to allow the rear section, or both the rear section and the arm member, to flex, for example, by pivoting, rotating, tilting, and / or bending. The joint unit is in an initial state when the distance from the rear section to the arm member, measured in projection from the arm contact point to the rear contact point in the axial plane, is a rear initial distance. The joint unit is in a target state when the distance from the rear section to the arm member, measured in projection from the arm contact point to the rear contact point in the axial plane, is a rear target distance, wherein the joint unit is biased toward the initial state. Preferably, the initial state of the connector unit is a relaxed state.

[0020] According to an embodiment, the joint unit is configured as a separate component serving as a hinge or sliding joint (e.g., a ball joint). The joint unit may include an elastic element (e.g., a spring) to provide bias toward the initial state. Alternatively, the rear portion of the rear section and / or the rear portion of the arm member is part of or constitutes the joint unit.

[0021] According to an embodiment, the connector unit includes a main region located in the rear section, the main region being elastic. According to a preferred embodiment, the connector unit further includes an auxiliary region in the form of a part of the arm member, the auxiliary region being elastic. In these embodiments, the connector unit may include a flange extending radially outward from the rear section relative to a central longitudinal axis. The arm member extends axially forward from a radially outer portion of the flange. The main region is a region including a part of the rear section and optionally also a part of the flange. The auxiliary region is a region including a part of the arm member and / or a part of the flange, such as the radially outer portion of the flange and / or the rear portion of the arm member. Such embodiments achieve a simple construction of the connector unit, wherein the elastic region provides flexibility and bias toward the initial state.

[0022] According to a preferred embodiment, in the target state of the joint unit, the bending stiffness of the auxiliary region is less than that of the main region. In embodiments where the joint unit includes an elastic region, the elastic deformation stiffness of the auxiliary region is less than that of the main region. This can be achieved, for example, by having the rear portion of the arm member have a smaller dimension at the rear section and / or the flange than the main region of the joint unit. Examples of other design alternatives include providing the auxiliary region at the arm member with a material that is more elastic than the main region at the rear section, and / or correspondingly adapting a spring element included in the joint unit. In this preferred embodiment, it is advantageous that the rear section can be arranged to bend just enough to bring the front section to the target orientation, so that the stamping device is not unnecessarily weakened.

[0023] The front section is operable to present an initial orientation and a target orientation. Optionally, the target orientation differs from the initial orientation in that the front section rotates about the stamping axis, wherein the front point is at the same position in both the initial and target orientations, and / or the target orientation differs from the initial orientation in that the front point of the front section moves in the radial direction, or a combination thereof. Preferably, the target orientation of the front section is achieved by changing the distance measured from the arm contact point to the rear contact point, causing the rear section to pivot, rotate, and / or bend at the joint unit. This forces the joint unit into the target state.

[0024] According to an embodiment, viewed in the axial projection on the axial plane, when the front section is in the target orientation, the position of the front point is located at a distance from the position of the front point when the front section is in the initial orientation—a distance from the target orientation. Typically, the problem caused by the formation of unevenly distributed burrs may be due to misalignment between the front section and the cavity and / or angular errors of the front section relative to the cavity. In this embodiment, particularly unevenly distributed burrs caused by misalignment can be corrected by translating the front point. This translation can be in any direction in the axial plane, such as in the radial direction, along an arc around the front point when the front section is in the initial orientation, or both.

[0025] To adjust the distance from the rear section to the arm member, the pressing tool includes a spacer element operable to translate from a starting position to a target position. Preferably, the spacer element is a single component, such as a screw, wedge, clamp, or lever.

[0026] The spacer element is arranged and configured to engage the arm member via the arm contact point and the rear section via the rear contact point, at least when it is in the target position. According to an embodiment, when the spacer element is in the initial position, it does not engage with at least one of the arm contact point and the rear contact point. Thus, after the front section has been brought to the target orientation, all relevant components of the pressing tool can be reset to their respective initial positions / initial states by disengaging the spacer element. Then, due to the bias of the connector unit, the front section returns to the initial orientation, which can be used to define a reference orientation for the front section and / or a reference position for the front point. Preferably, the initial state of the connector unit is a relaxed state. According to a preferred embodiment with a connector unit, the connector unit includes an auxiliary region in the form of a portion of the arm member located axially rear of the arm contact point.

[0027] Optionally, the arm contact point and the rear contact point are arranged in the same axial plane, or in different axial planes. Preferably, the arm contact point and the rear contact point are arranged on surfaces facing opposite directions, for example, away from or towards each other. Typically, one and / or both contact points are any points within the contact area.

[0028] Optionally, the spacer element contacts the arm contact point and / or the rear contact point directly, or via an intermediate element (e.g., a spring element). Preferably, the spacer element is arranged between the arm member and the rear section. Preferably, the arm contact point is located on the surface facing the rear section, and the rear contact point is located on the surface facing the arm member. Thus, the spacer element can directly engage the contact point by abutting against it, and can change the distance between the contact points by forcing them away from or towards each other.

[0029] Preferably, when the spacer element is operated to translate from the starting position to the target position, the spacer element is arranged to force the arm contact point and the rear contact point away from each other, thereby increasing the distance. In an alternative embodiment, the spacer element is arranged to decrease the distance when operated to translate from the starting position to the target position.

[0030] According to an embodiment having a spacer element in the form of a screw, the arm member includes a threaded through-hole, the screw being threadedly engaged with the threads in the through-hole, and the arm contact point being located on the threads of the through-hole. In this embodiment, moving the spacer element corresponds to rotating the screw, thereby allowing the operator to precisely control the target spacing distance.

[0031] In other embodiments, the arm contact point is located on the main surface of the arm member or on an element that cooperates with the arm member.

[0032] According to a preferred embodiment, when the spacer element is in the initial position, the spacer element engages with the arm contact point and the rear contact point, and the initial state of the connector unit is a relaxed state; and when the spacer element is in the target position, the spacer element has been translated by a target spacing distance, and the ratio between the target spacing distance and the front target distance is at least 20. Advantageously, this facilitates fine-tuning of the distance the front point moves. The target distance associated with the spacer element should be understood as a linear distance by which the operator moves the spacer element to change the distance from the arm contact point to the rear contact point.

[0033] According to an embodiment, - The front section is included in a replaceable stamping tool, which also includes a tool coupling located at the axial rear end. - The stamping device includes a complementary coupling portion that, together with the tool coupling portion, forms a connecting member, wherein the connecting member is located in the rear section. - The stamping device includes an abutment element that extends axially without contacting the connecting member, and - The rear contact point is located on the abutment element.

[0034] Ideally, the rear contact point is located at or near the front end of the rear section. Advantageously, the rear section functions as a long lever, thereby generating torque at the joint unit in response to relatively large displacement at the rear contact point. The coupling at the front end includes a sensitive reference surface, wherein, since the rear contact point is located on the abutment element, it is ensured that the spacer element will not push against the coupling even when located at the front end of the rear section. This reduces the risk of misalignment and / or deformation at the coupling caused by the spacer element.

[0035] In other embodiments, the rear contact point is located on the surface of the rear section.

[0036] Preferably, the abutment element is a sleeve element extending concentrically with the stamping axis, the sleeve element having a flexible wall, such as an elastically deformable wall. Preferably, the sleeve element is attached axially rearward to the front end of the rear section of the coupling and extends axially forward from there. Due to the flexible wall, the target distance of the spacer element is increased compared to when the rear contact point is located on a non-flexible surface, which facilitates fine-tuning of the target position of the front section.

[0037] According to an embodiment, the pressing tool further includes a spring element, which engages with the spacer element at a first end and with the rear contact point of the rear section at a second end. Optionally, the spring element is an elastic element, such as an elastic material block, a coil spring, a disc spring, a leaf spring, etc. Thus, compared to when the spacer element is in direct contact with the rear contact point, the target distance of the spacer element is increased, which facilitates fine-tuning the target orientation of the front section.

[0038] According to an embodiment, the pressing tool further includes: - A plurality of the aforementioned spacer elements, each operable to translate from an associated starting position to an associated target position. - Multiple arm components, in - Each spacer element is arranged and configured to engage a corresponding one of the plurality of arm members via an associated arm contact point, and to engage the rear section via an associated rear contact point. - When all of the plurality of spacer elements are in their associated starting positions, the connector unit is in the starting state and the front section is in the starting orientation, and - When any one of the plurality of spacers is in the associated target position and all the other spacers are in their respective associated starting positions, the distance from the associated arm contact point to the associated rear contact point, viewed in the axial projection on the axial plane and relative to any one of the plurality of spacers, is the associated rear target distance, thereby the joint unit is in the associated target state biased toward the starting state and the front section is in the associated target orientation.

[0039] Therefore, the pressing tool can be configured to allow the target orientation of the front section to be adjusted in different linear and / or angular directions. Optionally, the plurality of arm members are separate elements or integral elements, wherein the arm contact points are located at different positions for the respective arm members among the plurality of arm members. Optionally, the plurality of spacer elements are separate elements or integral elements. Preferably, each spacer element is movably arranged independently of all other spacer elements.

[0040] Optionally, the connector unit includes regions and / or elements, each region and / or element being associated with a corresponding arm member among the plurality of arm members.

[0041] Preferably, at least some of the associated rear target distances have different orientations. Preferably, the different rear target distances translate into different associated target orientations for the front section. For example, the plurality of spacers includes two spacers, and the plurality of arm members includes two associated arm members, wherein the target distances are arranged perpendicular to each other. By manipulating the two spacers projected onto the axial plane, the operator can push the front point of the front section to many different desired positions in the axial plane.

[0042] According to an embodiment, the first associated rear target distance and the first associated front target distance are perpendicular to the second associated rear target distance and the second associated front target distance, respectively. This simplifies the fine-tuning of the target orientation in the front segment.

[0043] According to an embodiment, the first associated rear target distance and the first associated front target distance are aligned with and opposite to the third associated rear target distance and the third associated front target distance, respectively. Thus, the first and second spacer elements operate in opposite pairs. For example, the pressing tool includes two pairs of spacer elements, i.e., four spacer elements. This simplifies fine-tuning of the target orientation of the front section. Attached Figure Description

[0044] In the following description, exemplary embodiments will be described in more detail with reference to the accompanying drawings, in which: Figure 1 This is a schematic diagram of the first embodiment of the pressing tool; Figure 2 This is a schematic exploded view of the first embodiment of the pressing tool; Figure 3 This is an enlarged schematic perspective view of the stamping apparatus and associated components according to the first embodiment, viewed from an angle toward the rear end of the stamping apparatus; Figure 4 This is viewed from the angle towards the top of the front end of the stamping device. Figure 3 A view of the stamping device and associated components shown; Figure 5 yes Figure 3 An exploded view of the stamping device and related components shown; Figure 6 yes Figure 3 Axial front view of the stamping device and associated components shown; Figure 7 yes Figure 3 A side view of the stamping device and associated components shown; Figure 8 It is along Figure 3 A cross-sectional view of the stamping axis of the stamping device and associated components shown; Figure 9 It is a schematic cross-sectional view of a green blank with uneven burrs in a pressing tool with an misaligned front section; Figure 10 It is a schematic cross-sectional view of a green blank with a cutting blade having uniform burrs in a pressing tool having an adjusted front section; Figure 11 It corresponds to Figure 3 The view shows the stamping device and associated components when the current section is in the initial orientation; Figure 12 It corresponds to Figure 11 An axial view showing the stamping tool removed and indicating the starting position of the front point; Figure 13 It corresponds to Figure 3 The view shows the stamping device and associated components when the current section is in the target orientation; Figure 14 It corresponds to Figure 13 An axial view showing the stamping tool removed and indicating the starting position of the front point and the first target position; Figure 15 It corresponds to Figure 14 The view shows the starting position of the foreground point and the second target position; Figures 16 to 18 Is along the corresponding Figure 8 A side view of the stamping axis shows an alternative embodiment of the pressing tool.

[0045] All accompanying drawings are schematic and not necessarily drawn to scale, and generally only show components necessary to illustrate the respective embodiments, while other components may be omitted or merely suggested. Unless otherwise stated, the same reference numerals denote the same components in different figures. Detailed Implementation

[0046] exist Figure 1 and Figure 2 The overall design of a first embodiment of a pressing tool according to the present invention is shown. The pressing tool is a die-cutting pressing tool and includes two die sections 1 and 2. The pressing tool also includes two stamping devices 3 and 4 in the form of a single upper stamping device 3 and a single lower stamping device 4. In the exemplary embodiment, each die section 1 and 2 and each stamping device 3 and 4 is individually movable.

[0047] Two mold sections 1 and 2 are arranged movablely along a horizontal axis 5, wherein each mold section can be moved to a corresponding proximal position and to several corresponding distal positions. Specifically, mold sections 1 and 2 can move inward toward the center and outward away from the center.

[0048] Two stamping devices 3 and 4 are movably arranged along a stamping axis 7, which, in the example embodiment, is vertical during normal operation of the pressing tool. The stamping devices 3 and 4 can be moved to respective proximal positions and to several respective distal positions. In other words, the stamping devices 3 and 4 can move toward and away from each other.

[0049] During operation, the mold sections 1 and 2 and the lower stamping device 4 move to their respective proximal positions, thereby forming a closed cavity at the center for compacting powder therein.

[0050] refer to Figures 3 to 15 The features of the first embodiment are described, wherein, of the two stamping devices 3 and 4, only the upper stamping device 3 and its associated elements are shown and described.

[0051] The stamping device 3 includes a front section 11 and a rear section 14, the rear section 14 being directly axially rear of the front section 11. The front section 11 has a front end in a cavity, wherein the front end has an axially foremost point. The axially foremost point is a center front point 12, and specifically located on the central longitudinal axis of the front section. Front point 12 is also the axially foremost point of the stamping device 3. In a first embodiment, the front section 11 forms the front portion of a replaceable stamping tool, see [reference needed]. Figure 5 .

[0052] The stamping device includes a tool coupling 15 located at the axial rear end of a replaceable stamping tool. The stamping device 3 includes a complementary coupling 16, which together with the tool coupling 15 forms a connecting member. This connecting member securely holds the replaceable stamping tool. This connecting member constitutes the front portion of the rear section 14.

[0053] The stamping device includes an abutment element in the form of a sleeve element 21. In a first embodiment, the sleeve element is a box 21 that opens axially forward and has four elastic flexible sides.

[0054] Arm member 17 extends axially along rear section 14 at a distance from rear section 14. The arm member is in the form of a plate extending along the adjacent side of the rear section and the associated side of housing 21, wherein the plate faces the rear section 14; specifically, the main surface of the plate faces the associated side of housing 21. A gap is formed between arm member 17 and the associated side of housing 21. Arm member 17 has an internally threaded through-hole at its axial front end, wherein arm contact point 19 is located on the surface of the thread.

[0055] The first embodiment has multiple arm members 17, specifically four arm members 17. The arm members 17 are arranged in pairs, with each pair positioned on opposite sides of the stamping axis 7 in the diametrical direction. Figure 6 As can be seen in the front view, the axis x from the first arm member 17 to the second arm member 17 of the first pair is perpendicular to the corresponding axis y of the second pair. The axes x and y intersect the stamping axis 7.

[0056] Each arm member 17 is connected to the rear section 14 via a joint unit 18, such that the distance from the rear section 14 to the arm member 17 is adjustable at a position axially forward of the joint unit 18.

[0057] According to a first embodiment, the joint unit 18 includes a circular plate forming a circular flange extending radially outward relative to the rear section 14. An arm member 17 extends axially forward from the radially outer portion of the flange. The joint unit 18 is configured and arranged to allow each arm member 17 to flex in response to an increase and / or decrease in the distance from the rear section 14 to the corresponding arm member 17. The joint unit 18 includes a main region 22 in the form of a portion of the rear section 14 and an auxiliary region 23 in the form of a portion of each arm member 17. Both the main region 22 and the auxiliary region 23 are elastic, such that the rear section 14 and each arm member 17 bend at the joint unit 18 due to elastic deformation of the main region 22 and the auxiliary region 23. In other embodiments, portions of the flange are included in the main region and / or the auxiliary region.

[0058] The auxiliary region has a smaller elastic deformation stiffness than the main region.

[0059] Spacer element 10 is movably arranged in the pressing tool, wherein spacer element 10 is operable to translate from an associated starting position to an associated target position. Spacer element 10 is arranged and configured to engage a corresponding one of a plurality of arm members 17 via associated arm contact point 19, and to engage the rear section 14 via associated rear contact point 20. Rear contact point 20 is in the form of an abutment surface on an associated side of housing 21. The auxiliary region of joint unit 18 forming the front portion of the arm member is located directly axially rear of arm contact point 19.

[0060] In the first embodiment, the spacer element 10 is in the form of an externally threaded screw with a hexagonal head. The spacer element 10 is arranged so that the arm contact point 19 on the surface of the internal thread in the through hole of the arm member 17 engages with the surface of the external thread of the screw. In addition, the spacer element 10 is arranged so that the rear contact point 20 on the side surface of the housing 21 engages with the end face of the screw.

[0061] A first embodiment of the pressing tool includes four such spacer elements 10. Figure 6 As can be seen from the front view, the rear contact points 20 are arranged in pairs on the x and y axes, with each pair of rear contact points 20 arranged on opposite sides of the diameter direction of the stamping axis 7.

[0062] The pressing tool is operable to form a cutting blade green body 8 by compacting powder, which in this example embodiment is cemented carbide powder. During operation, die sections 1 and 2 and the lower stamping device 4 are moved to a proximal position, thereby forming a cavity in the central region. Powder is introduced into the cavity and compacted within it by moving the upper stamping device 3 to its proximal position. Subsequently, die sections 1 and 2 and / or stamping devices 3 and 4 are moved to their respective distal positions, and the cutting blade green body 8 is removed.

[0063] Figure 9 A schematic cross-sectional view of the pressing tool is shown after the powder has been compacted into the green blank 8 of the cutting blade. In the pressing tool, the upper punch 3 is misaligned. The front point 12 is off-center, located slightly to the left of the cavity center, as shown in the figure. This results in pressing burrs 9 forming unevenly along the edge of the green blank 8 of the cutting blade. For clarity, in Figure 9 and Figure 10 The cutting insert green body 8 and the pressed burr 9 are shown in a magnified and exaggerated manner.

[0064] Figure 11 and Figure 12 It shows when in the presence of Figure 9The orientation shown corresponds to the front section 11 during the initial orientation. Front point 12 is in the initial position. Spacer element 10 is in the initial position, with the end face of the screw in contact with rear contact point 20. The distance from arm contact point 19 to rear contact point 20 is the rear initial distance 29. Connector unit 18 is in a relaxed initial state.

[0065] To achieve more uniform burrs, the front section 11 is adjustable to present a target orientation. In the example embodiment, the target orientation differs from the initial orientation in that the front point 12 is located at a front target distance 25 from the position of the front point 12 when the front section is in the initial orientation. At the target position, the front end of the front section 11 is centered in the die, resulting in more uniform burrs on the blade blank 8. The front target distance 25 is measured as seen in the axial plane (on which both the initial and target positions of the front point 12 are projected). In the example embodiment, the front target distance 25 is in the radial direction corresponding to the x-axis. The axial plane corresponds to... Figure 12 , Figure 14 and Figure 15 The view.

[0066] In other embodiments, the target orientation differs from the initial orientation in that the front segment 11 rotates and / or the front target distance is in any other direction in the axial plane.

[0067] In the first embodiment, the target orientation of the front section 11 is achieved by changing the distance measured from the arm contact point to the rear contact point, causing the rear section 14 to flex by bending at the joint unit 18. This primarily involves the auxiliary region 23 bending and elastically deforming, see [reference needed]. Figure 13 However, the main region 22 also slightly bends and elastically deforms, causing the front point 12 to move a distance 25 from the target. The connector unit 18 is forced into the target state.

[0068] The change in distance between arm contact point 19 and rear contact point 20 is achieved by operating the spacer element 10, which is in the form of a screw. When the screw rotates in the threaded hole of the arm member 17 to move radially inward toward the stamping axis 7, the end face of the screw engages the rear section 14 by abutting against the contact point 20 on the side surface of the housing 21. Simultaneously, the screw's threads engage the arm contact point 19 by the interaction of the screw's external threads and the internal threads of the arm member 17. Thus, the screw forces the arm contact point 19 and the rear contact point 20 apart. When the screw has been fully rotated, it has translated the target spacing distance 26 through the through hole in the arm member 17, and the distance from the arm contact point 19 to the rear contact point 20 is the rear target distance. Consequently, the front point 12 of the front section 11 has moved the front target distance 25.

[0069] Specifically, in the first embodiment, the screw is a fine-threaded M10 screw with a pitch of 0.75 mm. When the screw rotates one revolution, it translates by a target distance 26 of 0.75 mm. Thus, the rear starting distance 29 increases by 0.75 mm to become the rear target distance 24. In this embodiment, the result is that the front point 12 will move approximately 10 μm to reach a front target distance of 10 μm. Due to the hexagonal head, the 360° rotation can be subdivided into six divisions. Therefore, the rear starting distance can be increased in steps of 0.75 / 6 mm (division 0 = 0 mm, division 1 = 0.125 mm, division 2 = 0.25 mm, ..., division 6 = 0.75 mm), thereby reaching the rear target distance 24 of 0.75 mm in six steps. Therefore, the distance to the preceding target 25 can be increased in steps of 10 / 6 μm (graduation 0 = 0 μm, graduation 1 = 1.67 μm, graduation 2 = 3.33 μm, ..., graduation 6 = 10 μm). In this embodiment, the ratio of the distance between the interval targets to the distance to the preceding target is 75.

[0070] exist Figure 15 In this configuration, the position of the front point 12 is adjusted to a second target distance 25. It can be seen that two of the four spacer elements, in the form of screws, have been operated by rotation. The first screw 10a is rotated such that it is translated through the through-hole of the arm member 17 by the associated target spacer distance. The second screw 10b is rotated such that it is translated through the through-hole of the arm member 17 by the associated target spacer distance. Thus, the associated arm contact points 19a, 19b and the associated rear contact points 20a, 20b are separated by the associated rear target distances 24a, 24b. The first associated rear target distance 24a and the second associated rear target distance 24b have different directions, i.e., they extend perpendicularly to each other along the x-axis and y-axis, respectively.

[0071] exist Figure 15 Two additional spacer elements 10c can also be seen. Both spacer elements 10c are shown in a position where the end face is separated from the associated rear contact point 20. When the third spacer element 10c is operated, its associated rear target distance 24 and front target distance 25 are aligned with and opposite to the rear target distance 24 and front target distance 25 associated with the first spacer elements 10a and 10b, respectively.

[0072] exist Figures 16 to 18 Alternative embodiments of the pressing tool are shown, which differ from the first embodiment mainly in the spacer element 10. Therefore, only the spacer element 10 and its related features are described below.

[0073] exist Figure 16In the second embodiment shown, the spacer element is in the form of a wedge 10. In this second embodiment, the target spacing distance 26 is along the stamping axis 7 and perpendicular to the rear target distance 24 and the front target distance. The arm contact point 19 is arranged on the main surface of the arm member 17 facing the stamping axis 7. The rear contact point 20 is located on the side surface of the housing 21 as in the first embodiment. The advantage of the second embodiment is that if the wedge angle is small, the ratio between the target spacing distance and the front target distance is larger.

[0074] Figure 17 The third embodiment corresponds to the first embodiment, except that the spring element 28 is arranged between the end face of the screw 10 and the rear contact point 20 on the side of the box 21. The advantage of the fourth embodiment is that the ratio between the distance to the target and the distance to the front target is larger.

[0075] exist Figure 18 In the fourth embodiment, the spacer element 10 includes a screw and a lever element 27. The screw is arranged similarly to that in the first embodiment, with the arm contact point 19 located on the surface of the thread in a through hole in the arm member 17. The rear contact point is located on the side surface of the housing 21 and contacts the base of the lever element 27. One end of the lever element 17 is pivotally connected to the arm member 17, and the other end abuts against the end face of the screw. The advantage of the third embodiment is that the ratio between the spacer target distance and the preceding target distance is larger.

Claims

1. A pressing tool for forming a green cutting blade body (8) by compacting powder, the pressing tool comprising: - A cavity, the cavity being used to receive the powder to be compacted, and - A stamping device (3), which is movably arranged along a stamping axis (7) for compacting powder in the cavity, wherein the stamping axis (7) defines an axial direction and an axial plane. The stamping device (3) mentioned above includes, - An axially extending front section having a front end in the cavity, the front section being operable to present initial orientation and target orientation, and - An axially extending rear section, which connects to the front section and is located axially rear of the front section. Its features The compression tool also includes: - A spacer element (10) arranged in a movable manner, wherein the spacer element (10) is operable to translate from a starting position to a target position. - An arm member (17) extending axially along the rear section (14) at a distance from the rear section (14), and - Connector unit (18), in - The connector unit (18) connects the arm member (17) and the rear section, such that the distance from the rear section (14) to the arm member (17) at a position axially forward of the connector unit (18) is adjustable. - The spacer element (10) is arranged and configured to engage the arm member (17) via the arm contact point (19) and the rear section via the rear contact point (20). - When the spacer element (10) is in the initial position, viewed in the axial projection on the axial plane, the distance from the arm contact point (19) to the rear contact point (20) is the rear initial distance (29), thereby the joint unit (18) is in the initial state and the front section (11) is in the initial orientation, and - When the spacer element (10) is in the target position, the distance from the arm contact point (19) to the rear contact point (20) is the rear target distance (24) when viewed in the axial projection on the axial plane, thereby the joint unit (18) is in the target state biased toward the initial state and the front section (11) is in the target orientation.

2. The pressing tool according to claim 1, wherein, The connector unit (18) includes a main region (22) located in the rear section (14), the main region (22) being elastic.

3. The pressing tool according to claim 2, wherein, The joint unit (18) includes an auxiliary region (23) in the form of a part of the arm member (17), the auxiliary region (23) being elastic, wherein, in the target state of the joint unit (18), the auxiliary region (23) has a smaller bending stiffness than the main region (22).

4. The pressing tool according to any one of the preceding claims, wherein, The front end of the front section (11) has an axially foremost point, wherein the foremost point (12) is the center point in the same axial plane as the axially foremost point, wherein, in the axial projection on the axial plane, the position of the foremost point (12) when the front section (11) is in the target orientation is located at a distance (25) from the position of the foremost point (12) when the front section (11) is in the initial orientation.

5. The pressing tool according to claim 4, wherein, When the spacer element (10) is in the initial position, the spacer element (10) engages with the arm contact point (19) and the rear contact point (20), and the initial state of the connector unit (18) is a relaxed state. - When the spacing element (10) is at the target position, the spacing element (10) has been translated by a spacing target distance (26), and the ratio between the spacing target distance (26) and the previous target distance (25) is at least 20.

6. The pressing tool according to any one of the preceding claims, wherein, - The front section (11) is included in a replaceable stamping tool, which also includes a tool connection (15) located at the axial rear end. - The stamping device (3) includes a complementary coupling (16), which together with the tool coupling (15) forms a coupling member, wherein the coupling member is located in the rear section (14). - The stamping device (3) includes an abutment element that extends axially without contacting the connecting member, and wherein - The rear contact point (20) is located on the abutment element (21).

7. The pressing tool according to claim 6, wherein, The abutting element is a sleeve element (21) extending concentrically with the stamping axis (7), and the sleeve element (21) has a flexible wall.

8. The pressing tool according to any one of the preceding claims further includes a spring element that engages with the spacer element (10) at a first end and with the rear contact point (20) of the rear section (14) at a second end.

9. The pressing tool according to any one of the preceding claims, wherein, The spacer element (10) is arranged between the arm member (17) and the rear section (14).

10. The pressing tool according to claim 9, wherein, The spacer element (10) is a screw.

11. The pressing tool according to claim 10, wherein, The arm component (17) includes a threaded through hole, the screw is threadedly engaged with the thread in the through hole, and the arm contact point (19) is located on the thread of the through hole.

12. The pressing tool according to any one of the preceding claims, wherein, The compression tool includes: - A plurality of the aforementioned spacer elements (10), each spacer element being operable to translate from an associated starting position to an associated target position, - Multiple arm components (17), in - Each spacer element (10) is arranged and configured to engage a corresponding one of the plurality of arm members (17) via an associated arm contact point (19), and to engage the rear section via an associated rear contact point (20). - When all the spacer elements (10) are in their associated starting positions, the connector unit (18) is in the starting state and the front section (11) is in the starting orientation, and - When any one of the plurality of spacer elements (10) is in the associated target position and all the other spacer elements (10) are in their respective associated starting positions, the distance from the associated arm contact point (19) to the associated rear contact point (20) is the associated rear target distance (24) as viewed in the axial projection on the axial plane and relative to any one of the plurality of spacer elements (10), thereby the joint unit (18) is in the associated target state biased toward the starting state and the front section (11) is in the associated target orientation.

13. The pressing tool according to claim 12, wherein, - All of the associated post-target distances (24) have different directions.

14. The pressing tool according to claims 4 and 13, wherein, -Viewed in the axial projection on the axial plane, the position of the front point (12) when the front segment is in the associated target orientation is located at an associated front target distance (25) from the position of the front point when the front segment is in the initial orientation, and - The first associated rear target distance (24) and the first associated front target distance (25) are perpendicular to the second associated rear target distance (24) and the second associated front target distance (25), respectively.

15. The pressing tool according to claim 14, wherein, The first associated rear target distance (24) and the first associated front target distance (25) are aligned with and opposite to the third associated rear target distance (24) and the third associated front target distance (25), respectively.

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