WO1999023018A1

WO1999023018A1 - Repair kit

Info

Publication number: WO1999023018A1
Application number: PCT/EP1997/006087
Authority: WO
Inventors: Toralf Teuber; Jochen Caster
Original assignee: JOH. WINKLHOFER & SÖHNE GMBH & Co. KG
Priority date: 1997-11-04
Filing date: 1997-11-04
Publication date: 1999-05-14

Abstract

The invention relates to a repair kit for a linked conveyor chain which has at least one transportation arm projecting laterally over the chain links (1, 2), said transportation arm (12) having a cylindrical step (21) at its free end on which a spring-mounted damping element (14) is placed and fixed. The aim of the invention is to provide a more simple and more economical means of overhauling a linked conveyor chain of this type. To this end, the inventive repair kit has a helical pressure spring (25) with a placement opening whose inside diameter is greater than an outside diameter of the cylindrical step (21) of the transportation arm (12) and which can be placed on said cylindrical step, a damping element with a placement bore whose diameter is greater than the outside diameter of the cylindrical step of the transportation arm and which can be placed on said cylindrical step, and a retaining washer (30) with an inside diameter whose tolerance is selected to ensure that the inside diameter of the retaining washer is always at least 0.01 mm smaller than a diameter (dA) of a corresponding cylindrical end section (22) of the cylindrical step (21) and that the retaining washer (30) can be pressed onto the same in such a way that it can also be released.

Description

Repair kit

The present invention relates to a repair kit for a conveyor link chain, which has at least one transport arm projecting laterally over the chain links with a cylinder shoulder at its free end for attaching and fastening a spring-loaded damping element.

So far, as described in US Pat. No. 5,232,083, it is customary for can transport chains to replace the pin of an outer chain link at regular intervals by a laterally protruding driving pin. The driving pin has a length so that a beverage can can be pushed on, and is provided at its free end with a spring-loaded damping element, so that when the cans are inflated, the bottom thereof is not damaged. A compression spring inside the damping element ensures that the damping element can deflect accordingly. Here, the compression spring is supported on one side on a cover element pressed into the damping element and on the other side on a spring washer locked in a groove on the driving pin. So that the damping element is not lost, it has a collar encompassing the spring washer. Can transport chains of this type must also be suitable for driving through an oven in order to dry a layer of lacquer applied to the can. The damping element is made of a heat-resistant plastic, but is nevertheless subject to a certain amount of wear. In addition, the damping elements usually wear out earlier than the actual chain links, which is why the driving pin is usually detachably inserted with the corresponding chain links. To overhaul the chain, the entire drive pins including damping elements are removed and replaced with new ones.

Other connection methods between the damping element and the driving pin consist, for example, in that the end of the driving pin is compressed, similar to a rivet. As a result, the damping element is captively secured on the end of the driving pin. Due to the fact that the driver pin is removed, the chain connection is always interrupted at this point, which makes the overall manageability when exchanging all driver pins not exactly easy. In addition to improving the ease of installation, efforts are also being made to reduce the costs for such an overhaul of the chain.

The invention is therefore based on the object of achieving an improvement in the overhaul of a conveyor chain which has at least one transport arm projecting laterally beyond the chain sliders with a cylinder shoulder at its free end for attaching and fastening a spring-loaded damping element, by improving the manageability and the Costs are reduced.

This is achieved according to the invention by a repair kit according to claim 1. This is characterized by a helical compression spring with a push-on opening, the inner diameter of which is larger than an outer diameter of the cylinder shoulder of the transport arm and which can be plugged onto it, a damping element with a push-on bore, the diameter of which is larger than the outer diameter of the cylinder shoulder of the transport arm and which can be plugged onto it is, and a locking washer with an inner diameter, the tolerance of which is selected such that the inner diameter of the locking washer is always at least 0.01 mm smaller than a diameter of an associated cylindrical end portion of the cylinder shoulder and the locking washer is releasably pressable thereon.

In such conveyor chains, previously used in the prior art, the damping element was always permanently secured to the entraining bolt and could only be removed by destroying the fastening part, the damping element itself or by destroying the entraining bolt. According to the invention, it is now possible to pull worn damping elements from the driving pin by means of simple tools and to fix a new damping element to the free end section of the driving pin by means of the repair kit. The excess size of the lock washer guarantees that the press fit ensures that the damping element on the drive pin is adequately secured even at elevated temperatures in a drying oven. With a repair kit of this type, it is no longer necessary to replace the entire drive pin, which increases the costs for each because new driver bolts and the costs of disposing of the old driver bolts can be saved. In addition, the handling is much easier to assemble, since the chain no longer has to be interrupted at any point. Since the driver bolts and damping elements are mostly adapted to the size of conventional beverage cans, there are also relatively small diameters for the locking washer, which is why it can also be easily pressed on. The repair kit reduces the number of individual parts that have to be replaced many times over, since securing elements are also required for holding and positioning the driver bolt, which also no longer have to be removed by using the repair kit according to the invention.

So that the pressure on the driving pin does not become too great and there is no destruction of the surface thereof or the pressing takes place essentially in the elastic range, an embodiment is provided in which the inside diameter and the tolerance of the locking washer are selected such that at least an oversize of 0.01 mm, preferably 0.02 mm, and at most 0.1 mm, preferably 0.06 mm, relative to the outer diameter of the associated cylindrical end section of the cylinder shoulder.

For most applications, it has turned out to be particularly favorable here if the inside diameter of the locking washer is 5.78 ^{+ 002} mm.

So that there is as far as possible no permanent deformation on both the lock washer and the transport arm, the lock washer is hardened in such a way that its hardness is less than the hardness of the cylindrical end section of the cylinder shoulder. As a result, as far as plastic deformations occur, these are absorbed by the locking washer. The outer jacket of the cylindrical end section remains undamaged by the pressing.

Furthermore, two support disks can be provided for one-sided support of the helical compression spring and attachment to the cylinder shoulder, at least one of the support disks having an inner diameter that is larger than the outer diameter of the cylinder shoulder. The main effect of these support washers is that the helical compression spring is given the largest possible support surface with sufficient strength. One of the disks is generally used to be arranged as an intermediate layer between the damping element and the helical compression spring. For this purpose, this disk must be displaceable accordingly on the cylinder shoulder. The inner diameter of the second support disk is also preferably larger than the outer diameter of the cylinder shoulder, so that this also facilitates assembly.

Conveniently, the damping element can have a truncated cone shape and at its larger diameter end a cylindrical bore shoulder can be incorporated, the base of which can be brought into contact with the locking washer as a stop. This also defines the most extended position of the damping element. The spring travel of the helical compression spring remaining in this extended position then also determines the maximum deflection of the damping element.

So that the damping element has sufficient elasticity with the highest possible coefficient of friction, the damping element can consist of a heat-resistant plastic. A friction coefficient that is as high as possible is useful because the can is not moved when the damping element rebounds. In this context, a hard rubber has proven itself.

In order to avoid damage even when a beverage can is inflated or plugged in abruptly, the depth of the cylindrical arch shoulder and the length of the helical compression spring can be selected such that the transport arm does not protrude beyond the damping element when the helical compression spring is installed and compressed. This means that under no circumstances will there be any contact between the driving pin and the can bottom, although no covering of the end face of the transport arm has to be provided.

In a further embodiment, a mounting mandrel for opening the locking washer is provided, which has an end designed as a striking head and a mounting end, with means for holding the locking washer and a stop bore being provided at the mounting end and the diameter of the attachment percussion bore is larger than the outer diameter of the cylinder shoulder of the transport arm and the depth of the stop bore determines the impact dimension of the locking ring by the base of the stop bore can be brought into contact with the end face of the support arm. Such a mounting mandrel allows the locking washer to be easily and directly attached to the transport arm using a hammer. The stop bore defines the exact axial degree of slip on the cylindrical end of the transport arm. A fitter only needs to hit the assembly mandrel with a hammer until the end face of the cylinder shoulder strikes the base of the stop bore in an audible or palpable manner. As a result, the impact dimension is defined fairly precisely. It is not possible to open it too far.

The depth of the stop bore can advantageously be 2-4 mm, preferably 2.65 ^{+ 0.1} mm. Such a distance from the end face of the cylinder shoulder is sufficient to achieve a durable press fit.

In order to further agree on the mounting of the locking washer, the mounting mandrel can have at its mounting end coaxial to the mandrel axis and to the stop bore a bore shoulder surrounding the stop bore, which has an inside diameter that is essentially the same or slightly larger than an outside diameter of the locking washer. The locking washer is pre-positioned through the hole shoulder. This can e.g. be made with a fitting dimension so that the locking washer can be inserted into it with slight pressure. Furthermore, this facilitates the coaxial placement and, in particular, receiving of the cylinder shoulder in the stop bore.

A further advance in ease of assembly can be achieved in that the assembly end of the assembly mandrel is magnetic at least in the area of the bore shoulder and the locking washer is made of steel. The locking washer is held in its position at the end of the assembly mandrel by means of magnetism, which is why a tricky prepositioning on the transport arm can be eliminated.

Conveniently, at least one pin magnet can be embedded in at least one corresponding receiving bore in the flat surface of the bore shoulder, so that the at least one pin magnet essentially does not protrude beyond the flat surface. As a result, the assembly mandrel is magnetic only in the area of the bore shoulder and merely ensures that the locking washer is held. The fact that the pin magnets do not protrude beyond the flat surface prevents them from being damaged by the impact process. The force is transmitted through the flat surface of the bore shoulder.

In order to facilitate the threading and removal of the locking washer, the depth of the bore shoulder can be less than the thickness of the locking washer. This measure also prevents the assembly dome from coming into contact with the damping element. For better durability, the mounting end of the mounting mandrel can advantageously be hardened. The striking head of the assembly mandrel is preferably not hardened so that it has greater toughness.

In order that the loose parts of the repair kit can be identified immediately without the risk of confusion, the lock washer can have a different color than the support washers. The user can therefore immediately see which pane last, e.g. with the help of the assembly mandrel.

Furthermore, the invention relates to a can transport chain with chain links and at least one transport arm projecting laterally over the chain links with a cylinder shoulder at its free end for attaching and fastening a spring-loaded damping element. The chain is characterized in particular by the fact that at least one cylindrical end section of the cylinder shoulder is produced with a precise outer diameter, the tolerance of which is selected such that it is always at least 0.01 mm compared to an inner diameter of a locking washer of the repair kit according to one of claims 1-16 is larger and this can be releasably pressed onto the end section. In this context, releasably compressible means a non-destructive detachment of the locking washer, which can be carried out using common aids, such as special pulling pliers.

The cylindrical end section can advantageously have an outside diameter of 5.84. ₀ , ₂ mm have. Such a fit has been found to be extremely advantageous in connection with the lock washer of the repair kit. A sufficient opening of the locking ring is already guaranteed according to one variant if the length of the cylindrical end section is 2.8-3.7 mm, preferably 3 ^ mm.

According to a further embodiment, at least the cylindrical end section is hardened, preferably at least 600 HV 10, so that the cylinder shoulder is not damaged by the locking washer, and the damping element can be replaced several times.

An exemplary embodiment of the present invention is explained in more detail below with reference to a drawing. Show it:

1 is a partial view of a can conveyor chain in full section,

2 a transport arm with damping element of the transport chain from FIG. 1,

Fig. 3 shows the driver pin of the transport arm from Fig. 1 in an enlarged

Presentation,

4 shows an enlargement of area IV from FIG. 3,

5 shows an assembly mandrel in a partially sectioned front view,

6 is an enlarged view of the assembly mandrel from below,

7 is a sectional view of the assembly end of the assembly mandrel in an enlarged view,

8 shows an assembly process of the locking washer by means of the assembly mandrel from FIGS. 5 and

Fig. 9 shows the assembly process of FIG. 8 in an enlarged view. The can transport chain consists essentially of joined inner and outer chain links 1 and 2. A joint 3 of the chain is in each case formed by a pin bolt 4 of the outer chain link 2 and a sleeve 5 of the inner chain link 1. A roller 6 is also arranged on the sleeve 5. The pin bolt 4 connects the two outer plates 7 of the outer chain link 2 and the sleeve 5 the two inner plates 8 of the inner chain link 1.

At regular intervals, two articulated points lying next to one another and formed by one and the same outer chain link 2 have a somewhat different structure. At one end, the two outer plates 7 are connected to one another by a receiving sleeve 9 which projects laterally beyond the outer plates 7 on both sides. The inner tabs 8 are connected to one another by a sleeve 10 which is larger in diameter than the sleeve 5 in order to receive the receiving sleeve 9 on the inside. The adjacent Geienk 3, which belongs to the same outer chain link 2, differs from the normal joint structure only in that the locking bolt 11 connecting the outer plates 7 protrudes a good distance on one side over the outer plate 7.

The receiving sleeve 9 now serves as a plug-in receptacle for positioning a transport arm 12 projecting on one side of the chain. The transport arm 12 essentially comprises a cylindrical rod-shaped driving pin 13, on the free end region of which a truncated cone-shaped, spring-loaded damping element consisting of a heat-resistant plastic is arranged.

At the lower end (see FIG. 1), the driving pin 13 has a cylindrical plug-in receptacle 15 which can be inserted into the receiving bore of the receiving sleeve 9 with a precise fit. This cylindrical plug-in receptacle 15 is followed by a cylindrical press fit, onto which a locking tab 17 is pressed. The locking tab 17 has a second bore which is in alignment with the locking pin 11 and is also inserted with the latter, so that the driving pin 13 is held in its angular position. A securing element 18 ensures that the driving pin 13 together with the tab 17 can no longer be removed from the chain link. Above the press fit 16, the diameter of the driving pin 13 increases again, so that an attachment blow 19 for accurate positioning of the locking tab 17 is present. Above the stop 19 there is a triangular annular groove 20 which is smaller in its inner diameter than the diameter of the cylindrical plug-in receptacle 15, so that the annular groove 20 serves as a predetermined breaking point in the event of overload (see also in particular FIGS. 3 and 4).

At its upper free end, the driving pin 13 has a cylindrical shoulder 21, the cylindrical end section 22 of which has been processed with particular care. At least the cylindrical end section 22 is case hardened to a minimum of 600 HV 10. In the exemplary embodiment shown, the cylindrical end section 22 has a diameter d _A of 5.84. ₀ , o ₂ mm have been produced. The remaining diameter of the cylinder shoulder 21 can be manufactured with a coarser tolerance and is preferably of a slightly smaller diameter. The length L _{A of} the cylindrical end portion 22 is 3 °, mm.

A support disk 23 is pushed onto the cylinder shoulder 21 and comes to rest on the transition stage 24. The inner diameter of the support disk 22 is preferably slightly larger than that of the cylinder shoulder 21. A helical compression spring 25 is supported on this lower support disk 23, the inner diameter of which is also larger than the diameter of the cylinder shoulder 21. On the upper end of the helical compression spring 25 there is a second one Support disc 26 is placed, which in turn presses against the damping element 14. The frustoconical damping element 14, which is preferably made of hard rubber, is installed so that the smaller diameter points downwards and the larger diameter upwards. In the end 27 of the damping element 14 has a cylindrical bore shoulder 28, on the base 29 of which a pressing washer 30 is pressed onto the cylindrical end section 22. This locking washer 30 serves as an end stop and end fastening of the damping element 14. The end face 31 of the driving bolt 13 is at a distance from the end 27 of the damping element 14 which is greater than the effective spring length of the helical compression spring 25. This ensures that when the spring is fully compressed Damping element 14, the end face 31 does not protrude beyond the end of the damping element 14. The locking ^washer 30 has an inside diameter of 5.78 ^+0.02 mm. In this way, in conjunction with the fit dimension of the cylindrical end section 22, a press oversize of 0.02 to 0.06 mm is generated. In this area, the function of the locking washer 30 is ensured even at the operating temperatures to be expected, without the cylindrical end section 22 being damaged.

In particular, it is ensured that the hardness of the locking washer 30 is lower than the hardness of the cylindrical end section 22. This constellation enables the locking washer 30 to be removed again from the cylindrical end section 22 without damaging the surface thereof.

If there is now wear of the damping element 14 during operation of a can transport chain described above, because it is particularly exposed to strong thermal loads, a repair kit is used which consists of the support disks 23 and 26 of the helical compression spring 25, the damping element 14 and the locking washer 30. In addition, an assembly mandrel 33 is supplied at least once as part of the repair kit.

The mounting mandrel 32 is shown in FIGS. 5 to 7. The mounting mandrel 32 has a striking head 33, a cylindrical knurled handle part 34 and a mounting end 35 which is adapted in diameter to the cylindrical bore shoulder. It is important here that the assembly end 35 can be inserted into the cylindrical bore shoulder 28. A stop bore 37 with a flat base surface 38 is machined in the end face 36. The stop bore 37 is cylindrical and arranged coaxially to the mandrel axis A. A cylindrical bore shoulder 39 surrounding the stop bore 37 is also provided coaxially. The diameter of the bore shoulder 39 is selected so that the likewise cylindrical locking washer 30 can be received in this. The depth of the bore shoulder 39 is less than the thickness of the locking washer 30. The distance from the base 38 to the end face 36 or the depth T of the stop bore 37 is 2.65 ^+0.1 mm. This corresponds exactly to the extent to which the locking washer 30 is to be opened onto the cylindrical end section 22 at a distance from the end face 31 of the driving pin 13. The diameter of the stop bore 37 is chosen so that the cylindrical end portion 21 in this is recordable. In the flat surface 40 three cylinder bores are arranged offset by 120 ° to one another, into which pin magnets 41 (permanent magnets) are pressed. The end faces of the pin magnets 41 do not protrude beyond the flat surface 40, but rather are set back somewhat.

The operation and functioning of the above exemplary embodiment is explained in more detail below.

If an exchange of the damping elements 14 has to be carried out in a can transport chain shown in FIG. 1, these are pulled off the cylinder shoulder 21 by means of a special tool. Functional element 14, the support disks 23 and 26, the helical compression spring 25 and the locking washer 30 can then be disposed of.

The repair kit is then used. It should be emphasized at this point that the entire transport arm 12 has always been replaced in the prior art. With the repair kit, a new support plate 23, a helical compression spring 25 and a second support plate 26 only have to be plugged on first. Then the new damping element 14 with the small diameter is pushed onto the cylinder shoulder 21.

The final attachment and attachment of the locking washer 30 is explained in more detail by means of FIGS. 8 and 9.

The locking washer 30 preferably has a different color than the support washers 23 and 26, so that it can be identified immediately when handling the repair kit. The steel washer 30 is inserted into the bore shoulder 39 of the mounting mandrel 32 and held there by the pin magnets 41. This results in a considerable handling adjustment for the application of the locking washer 30. The assembly end 35 is then inserted into the cylindrical bore shoulder 28 and the locking washer 30 with its bore is placed on the end face 31. Direct pressing of the locking washer 30 by hand is not possible due to the interference fit. A hammer is used to head 33 hammered in, which, in contrast to the assembly end 35 of the assembly mandrel 32, is preferably not hardened. The hammer blows take place in the direction of the mandrel axis A. As a result, the locking washer 30 is slammed onto the cylindrical end section 22 until the end face 31 of the driving bolt 13 comes into contact with the base face 38 of the stop bore 37. Through the depth T, the impact dimension of the locking washer 30 is precisely defined and it is ensured that the desired press fit is present in this area. Due to the fact that the cylindrical end portion 22 is harder than the locking washer 30, this process can be repeated many times.

When overhauling a can transport chain with the repair kit described, far fewer parts have to be replaced and disposed of. In addition, the handling is relatively simple because the connection of the individual chain links does not have to be interrupted by pulling out the driving pin 13. The selected press fit has proven itself well in tests even at the current operating temperatures. A failure of the connection through the locking washer 30 must not be expected.

Claims

claims

1. Repair kit for a conveyor link chain, which has at least one laterally projecting over the chain links (1, 2) transport arm (12) with a cylinder shoulder (21) at its free end for attaching and fastening a spring-loaded damping element (14), characterized by a helical compression spring (25) with a push-on opening whose inner diameter is larger than an outer diameter of the cylinder shoulder (21) of the transport arm (12) and which can be plugged onto it, a damping element (14) with a push-on bore whose diameter is larger than the outer diameter of the cylinder shoulder (21 ) of the transport arm (12) and which can be plugged onto it, and a locking washer (30) with an inner diameter, the tolerance of which is selected such that the inner diameter of the locking washer is always at least 0.01 mm smaller than a diameter (d _A ) of one associated central end portion (22) of the cylinder shoulder (21) and the fuse is disc (30) releasably pressed on this.

2. Repair kit according to claim 1, characterized in that the inner diameter and the tolerance of the locking washer (30) are selected so that at least an oversize of 0.01 mm, preferably 0.02 mm, and at most 0.1 mm, preferably 0 , 06 mm, relative to the outer diameter (d _A ) of the associated cylindrical end section (22) of the cylinder shoulder (21).

3. Repair ^kit according to claim 1 or 2, characterized in that the inner diameter of the locking ^washer (30) is 5.78 ^+0.02 mm.

4. Repair kit according to one of claims 1 to 3, characterized in that the locking washer (30) is hardened, the hardness being less than the hardness of the cylindrical end section (22) of the cylinder shoulder (21).

5. Repair kit according to one of claims 1 to 4, characterized in that two support disks (23, 26) for each end support of the Helical compression spring (25) and plugging onto the cylinder shoulder (21) are provided, at least one of the support disks (23) having an inner diameter which is larger than the outer diameter of the cylinder shoulder.

6. Repair kit according to one of claims 1 to 5, characterized in that the damping element (14) has a truncated cone shape and at its larger diameter end (27) a cylindrical bore shoulder (28) is incorporated, the base surfaces (29) with the locking washer (30) can be brought to the system as a stop.

7. Repair kit according to one of claims 1 to 6, characterized in that the damping element (14) consists of a heat-resistant plastic.

8. Repair kit according to claim 6 or 7, characterized in that the depth of the cylindrical bore paragraph (28) and the length of the helical compression spring (25) are selected such that the transport arm (12) with assembled and compressed helical compression spring (25) does not have the Damping element (14) protrudes.

9. Repair kit according to one of claims 1 to 8, characterized in that a mounting mandrel (32) for opening the locking washer (30) is provided, which has a striking head (33) end and an assembly end (35), at the assembly end (35) Devices (41) for holding the locking washer (30) and a stop bore (37) are provided, and the diameter of the stop bore (37) is larger than the outer diameter of the cylinder shoulder (21) of the transport arm (12) and the depth ( T) of the stop bore (37) specifies the impact dimension of the locking ring (30) in which the base area (38) of the stop bore (37) can be brought into contact with the end face (31) of the transport arm (12).

10. Repair kit according to claim 9, characterized in that the depth (T) of the stop bore (37) is 2-4 mm, preferably 2.64 ^{+ 0.1} mm.

11. Repair kit according to claim 9 or 10, characterized in that on the assembly mandrel (32) at its assembly end (35) coaxial to the mandrel axis (A) and the stop bore (37) is provided a stop shoulder (37) surrounding the shoulder (39), which has an inner diameter which is substantially the same or slightly larger than an outer diameter of the locking washer (30).

12. Repair kit according to one of claims 8 to 11, characterized in that the mounting end (35) of the mounting mandrel (32) is magnetic at least in the region of the bore shoulder (39) and the locking washer (30) is made of steel.

13. Repair kit according to one of claims 8 to 12, characterized in that in the plane surface (40) of the bore shoulder (39) at least one pin magnet (41) is inserted into at least one corresponding receiving bore, so that the at least one pin magnet (41) in essentially does not protrude beyond the flat surface (40).

14. Repair kit according to one of claims 8 to 13, characterized in that the depth of the bore paragraph (39) is less than the thickness of the locking washer (30).

15. Repair kit according to one of claims 8 to 14, characterized in that the mounting end (35) of the mounting mandrel (32) is hardened.

16. Repair kit according to one of claims 5 to 15, characterized in that the locking washer (30) has a different color than the support washers (23,26).

17. Can transport chain with chain links (1, 2) and at least one laterally projecting over the chain links (1, 2) projecting arm (12) with a cylinder shoulder (21) at its free end for attaching and fastening a spring-loaded damping element (14), characterized that at least one cylindrical end section (22) of the cylinder shoulder (21) is produced with a precise outer diameter (d _A ), the tolerance of which is selected such that it is always at least 0 with respect to an inner diameter of a locking washer (30) of a repair kit according to one of claims 1 to 16, 01 mm larger and releasably pressable onto the end section (22).

18. Can transport chain according to claim 17, characterized in that the cylindrical end portion (22) has an outer diameter (d _A ) of 5.84. _{Has 0.02} mm.

19. Can transport chain according to claim 17 or 18, characterized in that the length (L _A ) of the cylindrical end portion (22) is 2.8 to 3.7 mm, preferably 3 f mm.

20. Can transport chain according to one of claims 17 to 19, characterized in that at least the cylindrical end portion (22) is hardened, preferably a minimum of 600 HV 10.